5121 5125.output

* GB785528 (A)

Description: GB785528 (A) ? 1957-10-30

Nuclear reactor plant

Description of GB785528 (A)

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CH354174 (A) DE1046790 (B) FR1167334 (A) US3089834 (A) CH354174 (A) DE1046790 (B) FR1167334 (A) US3089834 (A) less Translate this text into Tooltip

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PATENT SPECIFICATION Date of Application and filing Complete Specification: July 26, 1956. Application made in Sweden on Feb 29, 1956. Application made in Sweden on April 27, 1956. Complete Specification Published: Oct 30, 1957. 785,528 No 23095/56. Index at Acceptance:-Class 39 ( 4), P 3 C. International Classification:-G 21. COMPLETE SPECIFICATION Nuclear Reactor Plant We, ALLMANNA Sv EN Sic A ELECTRISICA AXTIEBOLAGET, a Swedish Company, of Vasteras, Sweden, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- Nuclear reactors with high temperature cooling medium used in the production of steam in power stations have hitherto been constructed

by enclosing the reactor in a pressure vessel The fuel elements have been cooled by compressed gas or pressurised liquid streaming along the same, which medium also circulates through a heat exchanger which produces the steam for the steam turbine. Insofar as compressed gas is concerned, the pressure has to be maintained high, possibly some tens of atmospheres, if the power required to drive the necessary gas-circulating apparatus is not to become excessively large. If water is used as the cooling medium, the pressure again has to be high if the temperature of the cooling medium is not to become too low with consequent poor efficiency of the plant. With reactors for large power, and therefore of large dimensions, the said pressure vessels are also large As the overall dimensions increase, the thickness of the vessel also increases for the same internal pressure In fact the thickness of the vessel even for moderate dimensions of the reactor and with moderate pressure may well be prohibitive Thicknesses of 20 cm have been mentioned in the relevant literature. The arrangement according to the present invention overcomes these inconveniences in that the reactor vessel is constructed with comparatively small thickness, and is inserted into a space formed in rock in such a manner that the rock, preferably provided with a thin smoothing layer of concrete, takes up the pressures stresses to which the walls, the bottom and the top of the reactor vessel are lprice 3 M 4 subjected Also water may be used as pressure transmitting medium between the reactor vessel and the rock wall. In a reactor plant according to the inventionit is possible to make the reactor vessel so large 50 that its upper portion forms a space provided with a travelling crane and manipulators for removing consumed fuel elements and inserting new elements. The removal of the old fuel elements and 55 the insertion of the new ones is performed suitably through a vertical mounting shaft which runs into an obturable opening in the top of the pressure vessel. It is important to take measures for avoiding 60 heat tensions in the vessel This can be effected in different ways For example, the pressure vessel may be kept at low and comparatively constant temperature by cooling. The cooling means in this case is suitably 65 carried out so that the vessel is provided with an inner thin corrugated wall and the space between both walls is filled with flowing cooling water under the same pressure as the pressure within the vessel As a modification the 70 pressure vessel may be provided with a resilient joint in the cylindrical portion, or/and with resilient joints between the cylindrical portion, and the top or bottom, respectively If this

arrangement is chosen, the cylindrical surface 75 of the rock or concrete may be provided with a thin cover sheet which facilitates sliding movement between the walls of the rock (concrete) and the vessel. Another variant is to position the vessel 80 freely within the rock space The surface of the rock, in this case, is sealed by a sheet lining or otherwise, and the interstice is filled with a medium of the same pressure as the pressure within the reactor vessel Such a 85 medium may be, for inscance, water or sodium or a mixture of bismuth and lead, since it is preferable for the medium to have a fusion point not too far from 100 C If minor defects occur within the sheet lining in connection 90 with cracks within the rock, the cracks will be sealed automatically in that the liquid metal will freeze In the case of water it is possible to add for instance fine asbestos fibres for sealing the cracks The method in question for constructing a big high-pressure vessel is intended firstly for the use in connection with heterogeneous reactors Such a vessel may, however, also be employed as a container for homogeneous reactors, or reactors which produce power by means of nuclear processes other than fission of U 235. Two reactor plants constructed in accordance with the invention will now be described, by way of example, with reference to the accompanrying drawings, in which Figures 1 and 2 are sectional elevations of the two plants according to the invention. Referring to Figure 1, the reactor illustrated consists substantially of a reactor body 1 containing fuel rods enclosed within tubes 2, an annular space 3, tubes 4 and a distributing vessel 5 for the incoming reactor cooling medium, a collecting vessel 6 for the outgoing cooling medium and cooling medium inlet and outlet pipes 7 and 8, respectively The latter is shown in Figure 1 as lying behind the former These pipes may also be arranged concentrically and led through a vertical channel 18, see Figure 2 A thick plate 9 provided with holes 10 communicating with the collecting vessel 6 serves as radiation protection and prevents the cooling medium from circulating between the reactor space and the space above it These parts are confined within a vessel 11, the pressure vessel, which also encloses an upper space 12 containing a hoisting means 13, manipulators 14 for the exchange of the fuel rods, and a television transmitter 15 The gas within this space may be cooled by means of cooling elements or by cooling the wall of the vessel 11 only The reactor vessel is located within a space 16 blasted out of rock The interstice 17 between the rock wall and the vessel is filled with concrete A vertical channel 18, obturated by a plate 19, runs into the top of the vessel In order to avoid heat tension within thepressure vesselitis cooledforexample by water having the same

pressure as the vessel. The water is kept flowing through a cooling space 20 In cases where the pressure vessel is arranged standing freely in the rock space 16, the surface of the rocks may be sealed by means of a sheet lining 21, shown in dotted lines In the latter case the interstice between the lining 21 and the pressure vessel is filled with a pressure-transmitting material 22. Figure 2 shows an arrangement which is a modification of that shown in Figure 1 The inlet pipe 7, which runs into the annular space 3, is connected through a tube 28 to a pipe 23, and the outlet pipe 8 coming from the collecting vessel 6 is connected to a pipe 24 which is accommodated within the tube 28 and the pipe 23 The lower end of the inlet pipe 23 is provided with a flange 25, which engages the rock where the vertical channel 18 runs into the rock space 16, and is anchored by means of bolts 26 -with respect to periods in which the pressure is zero Between the rock and the 70 flange and the lower part of the pipe 23, respectively, there is a filling medium, e g. concrete The tube 28 is provided with corrugations, in order to take up temperature dilatations of the pressure vessel 11 or movements 75 of the rock The pressure vessel 11 rests on a thick metal plate 29, which may be cooled by means of water flowing through channels 30. The space 17 between the rock and the reactor vessel as well as the tube 28 is filled with water 80 The pressure at these places, in the inlet and outlet pipes, mi the upper space 12 of the pressure vessel, and in the distributing and collecting vessels may be approximately the same, e g. to 100 atmospheres Possibly the water 85 pressure within the space 17 may be held somewhat lower, in order to prevent the water from entering the reactor in the event of a leak occurring in the vessel I 1 The water within the space 17 may have to be cooled by 90 a circulation means indicated by an inlet tube 31 and an outlet tube 32 in order to maintain the temperature below a certain maximum, for instance 50 OC Between the inlet pipe 23 and the rock above the concrete filling 27 there is a 95 space 33, which may communicate with the atmosphere.

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* GB785529 (A)

Description: GB785529 (A)

No title available


PATENT SPECIFICATION 785,529 Date of Application and filing Complete Specification: Aug 9, 1956. No 24452/56. Application made in Germany on Oct 4, 1955. Complete Specification Published: Oct 30, 1957. ee:-Class 89 ( 3), C 2. siflcation:-B 25 c. COMPLETE SPECIFICATION Improved Device for Driving Nails, Bolts and the like We, TORNADO RAMSET G m bl H & Co., a Body Corporate organised under the laws of Germany, of Angermunder Strasse 44, Lintorf Bezirk Dusseldorf, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a device for driving nails, bolts and the like, having a sleeve provided at its front end with an opening for the reception and guidance of a nail and a hammer or striker, which is movable in the sleeve, and by which the nail or the like is driven. The known nail driving devices of the above-imentioned kind have a relativelv small end surface which is placed on the surface to be nailed which often results in the bolts, nails or the like being driven-in obliquely Further, in the known devices the sleeve which guides the striker also acts as a handle, so that, if the device is operated without sufficient care, the operator may be injured A further disadvantage of the known device is that it must be provided with separate means for guiding and holding the nail at the end of the sleeve facing the place where the nail is to be driven in, such means being in the form of clamps or the like which considerably increase the cost of the device.

The object of the present invention is to provide a nail driving device which does not possess the above-mentioned disadvantage and is of simple construction and which, when placed on the surface to be nailed, is held in an upright position and consequently ensures that the nail, bolt or the like is driven in at right angles to the surface. This result is obtained, in accordance with the invention, by providing the nail driving device at its end face, which is placed on the surface to be nailed, with a number of lPrice 3 s 6 d l extended feet which support it over a wide area, one of the feet being also formed as a handle The handle advantageously consists of a resilient loop which is of substantially V-shape and is fixed to the ends of the sleeve 50 The upper part of the loop is provided with a rubber handle 'which at the end adjacent the sleeve and the head of the striker has a projection which acts as a hand guard The resilient loop, together with the other two 55 feet, which are formed by the downwardly bent ends of a resilient plate fixed to the sleeve form a three-point support which tends to hold the device in its normal or vertical position 60 According to a further feature of the invention, a rubber centering and holding disc for the nail or the like is provided at the lower end of the sleeve, the disc having a suitable boore for the insertion of the nail, 65 Owing to the resilience of the centering and holding disc, the bore of which closely surrounds the nail, the nail to be driven is securely held and guided wlhen being driven 70 A nail driving device constructed in accordance with the invention is illustrated, by way of example, in the accompanying drawing, in which Fig 1 shows the device in side elevation 75 partly in section, and Fig, 2 shows an elevation of the device at an angle of 90 to Fig 1. Referring to the drawing, the nail driving device consists essentially of a sleeve 1 and 80 a striker 2 which is movably guided in the sleeve and provided wvith a head 3 The striker 2 is provided at its lower end with a recess 4 for the reception of a nail or nailhead, In order to enable the device to be 85 easily manipulated, that end of the sleeve which has to he placed on the surface into which the nail is to be driven is provided with extended feet 5, 6 and 7 which afford support over a wide area, One of the feet 90 Index at acceptant International Clas consists of a substantially V-shaped loop 8 which is fixed to the ends 1 ', 1 ' of the sleeve. The upper part 8 ' of the loop 8 is provided with a rubber handle 9 having at its end adjacent the head 3 a projection 10 which acts as a hand guard The remaining two feet 5 and 6 are each formed by a resilient plate 11, the ends of which are slightly bent downwardly The plate is formed in the middle with a bore 12 and together with the lower arm 7 of the loop 8, which has a similar bore, is fixed to the

sleeve 1 by means of a screw cap 13 which engages in the bore 12. The screw cap 13 is provided with an opening 14 for the passage of the nail and also acts. as a support for a rubber centering and holding disc 15 for the nail The disc has a hole 16 which is slightly smaller than the hole 14 in the cap 13. The new driving device, owing to the provision of the extended feet 5, 6 and 7, is automatically held in its normal or vertical di iving position, and owing to the construction and arrangement of the handle 9, 10 the operator is protected against injury In addition, the rubber disc 15 at the lower end of the sleeve affords an extremely simple support and guide for the nail which, together with the remaining features, enables the construction of the device to be extremely simple. It will be noted that, owing to the arrangement of the feet 5 6 and 7 which is T-shaped in plan, the device can also be tilted into an inclined position simply by turning it about the straight line passing through the points of contact of the feet 5, 6 with the surface to be nailed.


* GB785530 (A)

Description: GB785530 (A) ? 1957-10-30

Loose leaf telephone index


PATENT SPECIFICATION 785,530 Date of Application and filing Complete Specification: Nov 16, 1955.

No 9708157. Application made on March 25, 1957, and Ante-dated under Rule 153 of the Patent Rules 1949. Complete Specification Published: Oct 30, 1957. Index at acceptance:-Class 146 ( 1), E 16. International Classification:-B 42 f. COMPLETE 'SPECIFICATION Loose Leaf Telephone Index I, LAJOS NAGY of Manor Lodge, 3, Manor Ways Chesham, Buckinghamshire, of British Nationality, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: - The present invention relates to a visible index device devised mainly for the purpose of a loose leaf telephone index. One disadvantage of most telephone indices used so far is that should the space reserved for names in the same letter-group be filled up with names, there is no easy possibility of inserting additional cards or sheets for additional names, Moreover, if any of the sheets or cards of telephone indices used so for is messed up owing ta frequent changes in addresses' or telephone numbers, there is no possibility of exchanging that sheet or card with a clean one, The present invention attempts to find a remedy in this respect by presenting a loose leaf telephone index in which, without revolutionary departure from the customary pattern, new cards can be inserted to increase the capacity of any letter-group without moving any, of the other cards and, any index card, can be exchanged with a new one without moving the other index cards, In the accompanying drawings Fig 1 shows a card with diagonal slots, Fig 2 shows an insert strip to be inserted into each pair of diagonal slots at the same level, Fig 3 shows the insert strip when inserted into the diagonal slots, Fig, 4 shows an index card and Fig 5 shows an insert card. Card 6, shown in Fig 1 is made of any firm sheet material Slots 7-20 are cut in diagonal position on the left and tight side of the card, the slots in the same column running parallel to each other, slots 7 and 8 forming a pair at the same horizontal level, slots 9 and forming another pair below the first pair and so on, each pair of slots at a lower and lower horizontal level The slots may be replaced by slits. lPrce 3 s, 6 d l Insert strip 21, shown in Fig 2 is made of any firm and flexlible sheet material with tongues 22 and 23 cut out on the left and' right of the oblong shape. Index card 2 '9, shown in Fig 4, is made of any firm and flexible sheet material, Creased lines 30 and 31 divide it into panels 32-34, panels 33 ' and 34 being somewhat shorter than panel 32 Crease 30 runs at a slightly lower level than edge 37 of panel 32 Panel 34 is

slightly larger in height than panel 33. Insert card 39, shown in Fig 5, is, made of any firm and flexible sheet material Crease divides it into panels 41 and 42, the latter forming a tongue like protrusion. The Loose Leaf Telephone Index is assembled as follows Slotted card 6 is fitted with insert strips 21, one such strip being inserted into each pair of slots The first insert strip is inserted into the slots 7 land & 8 on the top by pushing tongue 22 into slot 7 and tongue 23 into slot 8 as shown in Fig 3 In this position corner 24 of insert strip 21 pushes against the top left corner of slot 7 and, corner 25 of insert strip 21 pushes against the top right corner 'of slot 8, tongues 22, and 23 being stretched out at the back of slotted 'card 6 so that insert strip 21 cannot be moved without bending 'Another strip 21 is inserted into slots 9-10 in, a similar way, the next strip 21 is inserted into slots 11-12 and so on until there is a strip 21 inserted into each pair of slots in slotted card, 6 In this position the top edge 26 of each insert strip one further down the column is separated fromn top edge 2 '6 of the strip one higher up the column by the distance which separates each pair of slots. Bottom edge 27 of each insert strip 21 is resting on the bottom edge of each pair of diagonal slots The index cards: 2; 9 are hung over on the top edge 26 of each insert strip. Before placing the index cards in position, each index card is folded along crease 30 so that panels 33 and, 34 are folded on top of panel 32, then panel 34 is folded along crease 31 back on top of panel 33 Then the index card is turned over and upside down so that Mce Ss W Wee 25 P the folded panels 33 and 34 are on the top and at the back of the Index Card with edge 38, at the bottom The index card is placed in position by inserting the folded panels 33 and 34 between insert strip 21 and slotted card 6 and pushing the panels downwards until folded crease 30 pushes against top edge 26 of the insert strip so that the index card actually is suspended on the insert strip 21. The first index card should be suspended on, the strip which is inserted into slots 19 and 20 at the bottom of slotted card 6 The second index card is suspended on the strip one higher up the column and, so on, the last index card in the file being suspended on thestrip inserted into slots 7 and 8 on the top of the column In this position each index card one higher up the column covers most of the index card one further down the column, an edge strip of the latter remaining visible at the bottom (of the latter), while the whole of the index card on the top is visible Any of these index cards can be removed or exchanged without removing any of the other cards, The index cards are wedged by their folded panels 33 and 34 between insert strips 21 and slotted card 6 and they can only be removed by pulling

them upwards. Owing to the fact that panel 34 is slightly larger in height than panel 33, the edge strip 36 of panel 34 protrudes above the folded edge 30 of the index card in position so that with the exception of the index card at the bottom, each index card is suspended not only on the insert strip 21 but also on the protruding edge strip 36 of panel 34 35 is an imaginary lihe showing the border of the protruding edge stup of panel 34, The capacity of any index card can be increased by an insert card 39 which is placed in position by folding it along crease 40 so that panel 41 is folded, on top of panel or tongue 42 and tongue 42 pushed between the folded panels 33 and 34 of the index card the capacity of which is to be increased. Edge 37 on index card 29 is slightly set back from fold 30 for avoiding friction when the card is turned up and down during use. Edges 45 and 46 on insert card 39 are swept back for the same reason The two side edges 5 U of panel 42 on insert card 39 are swept back because when inserting panel or tongue 42 between the folded, panels 33 and 34, tongue 42 penetrates into that part of the fold which is inserted into the pair of slots carrying the strip 55 on which the index card is suspended and the side edges of tongue 42 are swept back to facilitate the penetration.


* GB785531 (A)

Description: GB785531 (A) ? 1957-10-30

Improvements in or relating to derailleur change-speed gears


PATENT SPECIFICATION

785,531 Date of Application and filing Complete Specification:June 13, 1955. No 17015/55. Application made in France on June 11, 1954. Application made in France on Oct 6, 1954. Complete Specification Published: Oct 30, 1957. Index at acceptance:-Class 80 ( 2), D 7 A 4. International Classification:-FO 6 h. COMPLETE SPECIFICATION Improvements in or relating to Derailleur Change-speed Gears I, LUCIEN CHARLES HIPPOLYTE JUY, of French nationality, of 75, rue Generale Fauconnet, Dijon, Cote d'Or, France, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:The present invention relates to derailleur change-speed gear mechanisms for cycles and like vehicles It is an object of the invention to provide such change-speed gear mechanisms in the form of a neat and compact assembly which is free from projecting and exposed parts such as are normally formed in the derailleur changespeed gear mechanisms known hitherto It is also a further object to provide changespeed gear mechanisms which are covered and perfectly protected. My co-pending Application No 17016/55 (Serial No 785,532) describes and claims a derailleur type change-speed gear mechanism comprising a hollow carrying lever, a selector member movable longitudinally within the lever and capable of attachment to an operating cable entering the lever, a chain guide carrier mounted at one end of the lever and movable at right angles to the lever, and a flexible connector between the carrier and the selector member. According to the invention there is provided a derailleur type change-speed gear mechanism comprising a bracket integral with or for attachment to a cycle frame, and a carrying lever which is attached at one end to the bracket and which at the other end supports a chain guide carrier movable at right angles to the lever, characterised in that the position of the lever with respect to the bracket is adjustable in a direction parallel to the direction of movement of the chain guide carrier with respect to the lever. lPrice 3 s 6 d l In order that the said invention may be clearly understood and readily carried into effect the same will now be more fully described with reference to the accompanying drawings which show several embodiments 50 by way of example and in which:Fig 1 is a side elevational view of one form of change-speed gear mechanism which is shown mounted on the rear lug of a cycle frame, the normal stepped sprockets on the 55 hub of the rear wheel of the cycle being indicated

in broken lines. Fig 2 is a rear view of the mechanism shown in Fig 1, the stepped sprockets being again shown in broken lines 60 Fig 3 is a section on a larger scale of a lever serving to support the change-speed gear mechanism on the supporting lug. Fig 4 illustrates the lever carrying the change-speed gear mechanism, with the 65 cover-plate removed in order to show the internal mechanism for adjusting the amount of displacement of the reciprocating system as a function of the number of sprockets on the wheel hub 70 Fig 5 shows in perspective one embodiment of a selector member. Figs 6 and 7 are further side and end elevational views respectively of the lever carrying the change-speed gear mechanism 75 Fig 8 shows a constructional detail and illustrating the mounting of the spring which exerts a permanent pivoting pressure on the lever carrying the change-speed gear mechanism 80 Fig 9 is a part sectional side elevation of a second embodiment of the change-speed gear mechanism which is also shown mounted on the rear lug of a cycle frame, the normal stepped sprockets on the hub of the rear 85 wheel of the cycle being shown in broken line. Fig 10 is an end view of the assembly shown in Fig 9, the stepped sprockets again being indicated in broken lines. Fig 11 is a sectional view of the 90 change-speed gear mechanism along the line 11-11 of Fig 9. Fig 12 is a sectional plan view along the line 12-12 of Fig 9. Fig 13 shows in perspective a sliding attachment member adapted to join the control cable and the small chain or other flexible traction member on the reciprocating axis. Fig 14 is a side view of a part of the change-speed gear mechanism along the line 14-14 of Fig 10. Fig 15 is a side elevational view illustrating a simplified embodiment of the articulation of the lever carrying the changespeed gear mechanism. Fig 16 is a sectional view of the construction shown in Fig 15. Fig 17 illustrates a rear pivoting position of the lever shown in Fig 15. Fig 18 is a side elevational view illustrating a second simplified embodiment of the articulation of the lever carrying the change-speed gear. Fig 19 is a sectional view of the construction shown in Fig 18. Referring now to the drawings 1 denotes a lug which carries the change-speed gear mechanism and serves to attach same to the rear lug a of a cycle frame. The lug 1 has an open slot 11 corresponding to the open slot in the

lug a of the frame The base of the slot 11 can serve as a constant positioning abutment for the axle b of the cycle wheel The hub of the wheel carries, in the usual manner several sprockets of different diameters, for example, c, d, e (shown in broken line in Figs 1-2 and 9-10), the chain which transmits the driving power running round these sprockets. The change-speed gear mechanism according to the invention comprises, in addition to the supporting lug 1, a carrving lever 2 pivotably mounted on an axle 3 carried by the lug 1 (Figs 1 and 2) Resilient means comprising a spring is interposed between the supporting lug 1 and the carrying lever 2 in order to exert on the latter a permanent pivoting force about the axle 3, in a clockwise direction as seen in Fig 1. The other end of the lever 2 carries a reciprocating device as illustrated in section in Fig 11 The free end of the reciprocating device carries two cheeks 4 between which is guided the chain of the cycle which runs round one of the sprockets c, d e Freely rotating rollers 5 serving as a rotating support for the chain f of the cycle (shown in broken line in Figures 2 and 10) are mounted between the cheeks 4. The lever 2 is made in the farm of a hollow member of cast or stamped metal, or in accordance with any other known process. with a view to receiving and piotecting the transmitting end of the reciprocating mechanism. In the embodiment illustrated in Figs 1 to 8, the carrying lever 2 is attached to the axle 3, in such a manner as to be adjustable 70 transversely in order to displace and to position the whole of the change-speed gear mechanism in relation to the sprockets c. d, e on the hub of the cycle wheel. For this purpose the upper part of the 75 lever 2 has a bearing 21 which is pivotably engaged with the axle 3 by means of a ring 6. The said ring 6 is so mounted on the axle 3, that while it is freely rotatable it cannot be displaced axially on said axle The angular 80 position of the lever 2 relatively to the ring 6 is determined by a key 61 carried by the ring 6. The key 61 matches a corresponding keyway in the lever 2 The lever 2 is fixed in the transverse position after adjustment by 85 means of a screw 7 having a conical end said screw being threaded into the lever 2, and serving to hold a locking plate S against the key 61. The system for applying resilient pressure 90 to the carrying lever 2 consists of a spring 9 wvound round an axis 12 on the Jug 1 One end of the spring is attached to the lug 1 by means of a screw 10, or any other suitable device The other end 91 of the spring exerts 95 a pivoting force either directly against the lever 2 or, as shown in the

drawing against a hook-like projection 81 which forms an extension of the locking plate 8 Alternatively the end 91 of the spring may co 100 operate with an abutinent or the like on the ring 6 In any case the ring 6 and the lever 2 are spring urged. In another embodiment illustrated in Figure S the supporting-) lug 1 has formed 105 therein a boss 13 w-hicll boss contains the major part of the spring 9 wound round a rod 11 The fixed end 92 of the spring is positioned by engagement in a hole in the boss 13 110 Gear-ehllanging is effected by a cable 12, which is, moreover actuated by a lever or any other known meanms which there is no need to show or to describe. The cal)le 12 ends in the hollow part of the 115 lever 2, where it is fixed by a screw or other means on a selector member 13 (Figs 4 and 5) The member 13 is slidably mounted in the hollow part of the lever 2 Furthermore. the end of a small chain 14 ot other flexible 120 transmission member is hiniedlv connected to the member 13, said transmission member extending as far as the reciprocating member carrying the cheeks 4 and the rollers 5 This assemnl)ly and the mounting of the recip 125 rocating members and the cheeks on the reciprocating axis conforim to the assembly and motuntini; described hereinafter with reference to Fig 11. The selector member 13 has a small 130 785,531 of which are attached, by brazing, screwing, rivetting or other known means of attachment, the cheeks 4 which guide the cycle chain. The dished shape part 41 of the cheek 4 nearer to the lever 22 allows on the one hand 70 a reduction in the transverse space taken up by the change-speed gear, and, on the other hand, it allows the end of a helical spring 27 to be centred and supported The other end of the spring 27 is centred and 75 supported in the circular groove formed in a pulley 28 which is rotatably mounted on the bearing 222 of the lever, against the lever 22 The end 271 of the spring is radially engaged in a notch in the pulley 28, and 80 remains fast therewith during operation, while the other end of the spring is supported and positioned in a hole pierced in the cheeks 4 at the base of the dished part 41 (Fig 11) 85 The spring 27 has a double function: On the one hand it is compressed between the pulley 28 and the cheeks 4, and ensures a return pressure which tends to move the cheeks and rollers away from the lever 22, 90 and, on the other hand, it is fitted with a certain torsion or circular tension, and tends to cause the cheeks and rollers to pivot in a clockwise direction (arrow F, Fig 9) The circular tension of the spring 27 is kept 95 constant on the chain by the play of the rotating pulley 28, which drives the end 27 ' of the spring 27 The rotation of the pulley 28 is effected by a cable 29 wound round the said pulley, the displacement of which is 100

controlled directly by the user in accordance with the chain tension desired Alternatively the rotation of the pulley 28 may be controlled in synchronism with the displacement of the cable 12, which displaces the recipro 105 eating system with the cheeks 4 and the rollers 5. The pin 26 of the movable telescopic reciprocating system has a head to which is attached the end of the small chain 1 of 110 which the other end is connected in articulated manner to a pair of lugs 242 in the selector member 24 Any other flexible member can be used for connecting the selector member 24 to the pin 26 A roller 30 so 115 fitted as to rotate freely in the hollow part of the lever 22 serves as a means for supporting and guiding the small chain 14. In accordance with the number of sprockets carried by the wheel hub (three sprockets c, 120 d, e, as shown in the drawing, or four or five sprockets), the amount of transverse displacement of the reciprocating device with the cheeks 4 and the rollers 5 has to vary, while being limited in each case For 125 this purpose, the selector member 24 has a lateral stepped shoulder 243 intended to abut against a stop which limits the amount by which it can slide in the lever 22 This stop is formed by the head 311 of a threaded 130 projecting transverse tongue 131 which is held by a small bar 15 engaged in one of a series of pairs of notches 22 formed internally of the carrying lever 2 (Fig 4) Locating the small bar 15 in one pair of the notches 22 adjusts the amount by which the member 13 can slide, and consequently the amount of the displacement of the tensioning lever formed by the cheeks 4 with the rollers 5, according to whether three sprockets c, I, e, four sprockets or five sprockets are used. The mechanism thus mounted in the carrying lever 2 is protected by a cover-plate 16 which is attached to the said lever for example by a screw 17 Alternatively the cover-plate may be sprung into position or secured in any other known manner The whole thus has a neat appearance, and the members are well protected. In another embodiment of the changespeed gear mechanism, illustrated in Figs 9 to 14, the lug 1 has a pivot 18 at its lower end, said pivot having a slotted head 181, and being locked on to the said lug between a collar formed on the pivot and a nut 19 A hollow cylindrical bush 20 is mounted so as to be able to rotate freely about the pivot 18, upon which the said bush is held by the head 181 of the pivot A helical spring 21 is disposed between the pivot and the bush 20. One end of the spring 21 is engaged and positioned in a hole 182 in the slotted head 181 of the pivot, while the other end of the spring is engaged and positioned in a hole in the bush 20. The carrying lever 22 is similar to that described with reference to Figs 1 to 8. However, the upper part of the lever 22 is so formed as to constitute

a split collar 221, fixable on the bush 20; after adjustment of the transverse position of the lever 22, the collar 221 is locked by a screw 23 which is threaded into the body of the lever 22, the head 231 of said screw abutting against the upper part of the collar. The head 231 of the screw 23 is recessed to receive the sheathing 121 of the cable 12. The cable 12 extends axially through the screw 23, which is apertured for this purpose, and is disposed internally of the hollow lever 22 for the purpose of being fixed by a screw 241 to a movable member 24 which is coupled to the small chain 14 The crosssection in Fig 12 illustrates the hollow part of the lever 22 in which the member 24 can slide, said member being formed, for example, as illustrated in Fig 13. The lower cranked part of the lever 22 has a sleeve like bearing 222, disposed perpendicularly in relation to the body of the lever An element 25 (as shown in the drawing, Fig 11) is mounted to slide telescopically in the bore of the bearing 222. The final element of the telescopic assembly is formed by the pin 26, to the outside end 785,531 rod 31 which traverses a slot 223 formed in a side wall of the hollow part of the lever 22 and also trasverses a plate 32 which can slide on one lateral face of the lever 22 The plate 32 is intended to mask the slot 223 whatever the position of adjustment of the rod 31 A nut 33 serves to lock the rod 31 with the head 311 in any selected position of adjustment The plate 32 may, as shown, have a cranked finger 321, which is adapted to co-operate with a scale marked on the cover-plate 34 fitted to the front face of the lever 22 and secured in position by crimping, force fit, by a screw 35 or by a combination of these means The mechanism fitted in the lever 22 is thus perfectly protected. The amount by which the carrying lever 22 can be pivoted is limited in both directions by virtue of the provision of a plate 36, in the form of a sector fast with the bush 20. The plate 36 projects axially of the bush 20 and into the plane of the lug 1 which is formed with a cut away portion of sector shape in order to accommodate said plate 36, the ends of this cut-away portion serving as abutment means for the plate 36 and the pivoting assembly (Fig 14) Following this description, the functioning and the advantages of this change-speed gear mechanism will be evident, in particular the articulated mounting of the lever 22 and the bush 20 The resilient pressure system acting on the lever 22 is entirely covered and protected and the whole, and particularly the rollers 5, can be rapidly adjusted in relation to one of the end sprockets on the wheel hub This adjustment is made easy and convenient by the fact that the upper part of the carrying lever 22 is made in the form of a

collar The device 31, 32 which adjusts the amount of the displacement of the telescopic reciprocating system is also effective, convenient and simple The same applies to the device intended to limit the amount of pivoting of the lever 22 and the whole mechanism. Figs 15 and 16 illustrate a simplified embodiment of the pivotal mechanism of the carrying lever 22 This pivotal mechanism comprises a bush 37 which is secured to the lug 1 supporting the change-speed gear mechanism by a bolt 38 having a nut The collar-shaped part of the lever 22 is so mounted on the bush 37, that axial adjustment thereof will be possible A plate 39 is fixedly screwed on the bush 37 and also relatively to the lever 22 in such a way as to provide two principal angular limiting positions of the lever 22, said plate being adapted to co-operate with a sector shaped recess formed in the lug 1, in such a manner as to provide a normal operating position (Fig 15) and a position pivoted rearwards (Fig 17) which facilitates the fitting and removal of the wheel for repairs. In this embodiment the lever 22 is not fitted so as to pivot resiliently during operation It is fixed in a predetermined angular position A spring is no longer fitted 70 in the axis 37 Construction is simplified, more economical and lighter Chain tension is then ensured solely by the spring 27 in the reciprocating device. Another embodiment, which is still further 75 simplified, is illustrated in Figs 18 and 19. In this case an axle 40 of polygonal crosssection (hexagonal for example) is attached by brazing, rivetting, screwing or other means to the supporting lug 1 The collar present 80 at the upper part of the lever 22 is locked on the axle 40, after transverse adjustment. It should be understood that the aperture in the collar of the lever is of a form corresponding to the cross-section of the axle 40 85 It is thus possible to provide well-determined different angular positions for the lever 22. Without departing from the scope of the invention, it is possible to make the axle fast with the supporting lug 1, and to provide 90 the same with grooves notches or other means formed in accordance with the generatrices of the axle, the aperture in the collar being formed to co-operate therewith. It may be pointed out here that in all 95 embodiments the supporting lug 1 can be omitted and replaced by an extension brazed to the lug a of the frame or directly formed by the said lug of the frame.

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* GB785532 (A)

Description: GB785532 (A) ? 1957-10-30

Improvements in or relating to derailleur change-speed gears


PATENT SPECIFICATION 785,532 Date of Application and filing Complete Specification: June 13, 1955. No 17016/55. Application made in France on June I 1, 1954. Application made in France on Oct 6, 1954. Complete Specification Published: Oct 30, 1957. Index at acceptance:-Class 80 ( 2), D 7 A 4. International Classification:-FO 6 h. COMPLETE SPECIFICATION Improvements in or relating to Derailleur Change-speed Gears I, LUCIEN CHARLES HIPPOLYTE JUY, of French nationality, of 75, rue Generale Fauconnet, Dijon, Cote d'Or, France, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to derailleur change-speed gear mechanisms for cycles and like vehicles. It is an object of the invention to provide such change-speed gear mechanisms in the form of a neat and compact assembly which is free from projecting and exposed parts such as are normally formed in the derailleur change-speed gear mechanisms known hitherto It is also a further object to provide change-speed gear mechanisms which are covered and perfectly protected. My co-pending Application No 17015/55 (Serial No 785,531) describes and claims a derailleur type change-speed gear mechanism comprising a bracket integral with or for attachment to a cycle frame, and a

carrying lever which is attached at one end to the bracket and which at the other end supports a chain guide carrier movable at right angles to the lever, characterised in that the position of the lever with respect to the bracket is adjustable in a direction parallel to the direction of movement of the chain guide carrier with respect to the lever. According to the present invention there is provided a derailleur type change-speed gear mechanism comprising a hollow carrying lever, a selector member movable longitudinally, within the lever and capable of attachment to an operating cable entering the lever, a chain guide carrier mounted at one end of the lever and movable at right angles to the lever, and a flexible connector between the carrier and the selector member. Further according to the invention there is provided a derailleur type change-speed lPrice 3 s 6 d l gear mechanism comprising a carrying lever, a selector member arranged to be moved along said lever and capable of attachment to an operating cable, means for limiting the range of movement of said selector 50 member along the lever, a chain guide carrier mounted at one end of said lever and movable at right angles to the lever, and a flexible connector between the carrier and the selector member 55 In order that the said invention may be clearly understood and readily carried into effect the same will now be more fully described with reference to the accompanying drawings which show several embodiments by 60 way of example and in which:Fig 1 is a side elevational view of one form of change-speed gear mechanism which is shown mounted on the rear lug of a cycle frame, the normal stepped sprockets on the 65 hub of the rear wheel of the cycle being indicated in broken lines. Fig 2 is a rear view of the mechanism shown in Fig 1, the stepped sprockets being again shown in broken lines 70 Fig 3 is a section on a larger scale of a lever serving to support the change-speed gear mechanism on the supporting lug. Fig 4 illustrates the lever carrying the change-speed gear mechanism, with the 75 cover-plate removed in order to show the internal mechanism for adjusting the amount of displacement of the reciprocating system as a function of the number of sprockets on the wheel hub 80 Fig 5 shows in perspective one embodiment of a selector member. Figs 6 and 7 are further side and end elevational views respectively of the lever carrying the change-speed gear mechanism 85 Fig 8 shows a constructional detail and illustrating the mounting of the spring which exerts a permanent pivoting pressure on the lever carrying the change-speed gear mechanism 90 Fig 9 is a part sectional side elevation of a second embodiment of the change-speed gear mechanism

which is also shown mounted on the rear lug of a cycle frame, the normal stepped sprockets on the hub of the rear wheel of the cycle being shown in broken line. Fig 10 is an end view of the assembly shown in Fig 9, the stepped sprockets again being indicated in broken lines. Fig 11 is a sectional view of the changespeed gear mechanism along the line 11-11 of Fig 9. Fig 12 is a sectional plan view along the line 12-12 of Fig 9. Fig 13 shows in perspective a sliding attachment member adapted to join the control cable and the small chain or other flexible traction member on the reciprocating axis. Fig 14 is a side view of a part of the change-speed gear mechanism along the line 14-14 of Fig 10. Fig 15 is a side elevational view illustrating a simplified embodiment of the articulation of the lever carrying the change-speed gear mechanism. Fig 16 is a sectional view of the construction shown in Fig 15. Fig 17 illustrates a rear pivoting position of the lever shown in Fig 15. Fig 18 is a side elevational view illustrating a second simplified embodiment of the articulation of the lever carrying the changespeed gear. Fig 19 is a sectional view of the construction shown in Fig 18. Referring now to the drawings 1 denotes a lug which carries the change-speed gear mechanism and serves to attach same to the rear lug a of a cycle frame. The lug 1 has an open slot 11 corresponding to the open slot in the lug a of the frame The base of the slot 11 can serve as a constant positioning abutment for the axle b of the cycle wheel The hub of the wheel carries, in the usual manner, several sprockets of different diameters, for example c, d e (shown in broken line in Figs 1-22 and 9-10), the chain which transmits the driving power running round these sprockets. The change-speed gear mechanism according to the invention comprises, in addition to the supporting lug 1, a carrying lever 2 pivotably mounted on an axle 3 carried by the lug 1 (Figs 1 and 2) Resilient means comprising a spring is interposed between the supporting lug 1 and the carrying lever 2 in order to exert on the latter a permanent pivoting force about the axle 3, in a clockwise direction as seen in Fig 1. The other end of the lever 2 carries a reciprocating device as illustrated in section in Fig 11 The free end of the reciprocating device carries two cheeks 4 between which is guided the chain of the cycle which runs round one of the sprockets c, d e Freely rotating

rollers 5 serving as a rotating support for the chain f of the cycle (shown in broken line in Figures 2 and 10) are mounted between the cheeks 4 70 The lever 2 is made in the form of a hollow member of cast or stamped metal, or in accordance with any other known process. with a view to receiving and protecting the transmitting end of the reciprocating 75 mechanism. In the embodiment illustrated in Figs 1 to 8, the carrying lever 2 is attached to the axle 3, in such a manner as to be adjustable transversely in order to displace and to 80 position the whole of the change-speed gear mechanism in relation to the sprockets c. d, e on the hub of the cycle wheel. For this purpose the upper part of the lever 2 has a bearing 21 which is pivotably 85 engaged with the axle 3 by means of a ring 6. The said ring 6 is so mounted on the axle 3, that while it is freely rotatable it cannot be displaced axially on said axle The angular position of the lever 2 relatively 90 to the ring G is determined by a key 61 carried by the ring 6 The key 61 matches a corresponding keyway in the lever 2 The lever 2 is fixed in the transverse position after adjustment by means of a screw 7 95 having a conical end said screw being threaded into the lever 2, and serving to hold a locking plate 8 against the key 61. The system for applying resilient pressure to the carrying lever 2 consists of a spring 9 100 wound round an axis 12 on the lug 1 One end of the spring is attached to the lug 1 by means of a screw 10, or any other suitable device The other end 91 of the spring exerts a pivoting force either directly against the 105 lever 2 or, as shown in the drawing against a hook-like projection 51 which forms an extension of the locking plate S Alternatively the end 91 of the spring may cooperate with an abutment or the like on the 110 ring 6 In any case the ring 6 and the lever 2 are spring urged. In another embodiment illustrated in Figure 8, the supporting lug 1 has formed therein a boss 13 which boss contains the 115 major part of the spring 9 wound round a rod 11 The fixed end 92 of the spring is positioned by engagement in a hole in the boss 13. Gear-changing is effected by a, cable 12, 120 which is, moreover, actuated by a lever or any other known means which there is no need to show or to describe. The cable 12 ends in the hollow part of the lever 2, where it is fixed by a screw or other 125 means on a selector member 13 (Figs 4 and 5). The member 13 is slidably mounted in the hollow part of the lever 2 Furthermore. the end of a small chain 14 or other flexible transmission member is hingedly connected 130 785,532 example, as illustrated in Fig 13. The lower cranked part of the lever 22 has a sleeve like bearing 222,

disposed perpendicularly in relation to the body of the lever An element 25 (as shown in the 70 drawing, Fig 11) is mounted to slide telescopically in the bore of the bearing 222 The final element of the telescopic assembly is formed by the pin 26, to the outside end of which are attached, by brazing, screwing, 75 rivetting or other known means of attachments the cheeks 4 which guide the cycle chain. The dished shape part 41 of the cheek 4 nearer to the lever 22 allows on the one hand a reduction in the transverse space 80 taken up by the change-speed gear, and, on the other hand, it allows the end of a spring 27 to be centred and supported The other end of the spring 27 is centred and supported in the circular groove formed in 85 a pulley 28 which is rotatably mounted on the bearing 222 of the lever, against the lever 22 The end 271 of the spring is radially engaged in a notch in the pulley 28, and remains fast therewith during operation, 90 while the other end of the spring is supported and positioned in a hole pierced in the cheeks 4 at the base of the dished part 41 (Fig 11). The spring 27 has a double function: On 95 the one hand it is compressed between the pulley 28 and the cheeks 4, and ensures a return pressure which tends to move the cheeks and rollers away from the lever 22, and, on the other hand, it is fitted with a 100 certain torsion or circular tension, and tends to cause the cheeks and rollers to pivot in a clockwise direction (arrow F, Fig 9) The circular tension of the spring 27 is kept constant on the chain by the play of the 105 rotating pulley 28, which drives the end 27 ' of the spring 27 The rotation of the pulley 28 is effected by a cable 29 wound round the said pulley, the displacement of which is controlled directly by the user in accordance 110 with the chain tension desired Alternatively the rotation of the pulley 28 may be controlled in synchronism with the displacement of the cable 12, which displaces the reciprocating system with the cheeks 4 and the rollers 5 115 The pin 26 of the movable telescopic reciprocating system has a head to which is attached the end of the small chain 14 of which the other end is connected in articulated manner to a pair of lugs 242 in the 120 selector member 24 Any other flexible member can be used for connecting the selector member 24 to the pin 26 A roller 30 so fitted as to rotate freely in the hollow part of the lever 22 serves as a means for 125 supporting and guiding the small chain 14. In accordance with the number of sprockets carried by the wheel hub (three sprockets c, d, e, as shown in the drawing, or four or five sprockets), the amount of transverse 130 to the member 13, said transmission member extending as far as the reciprocating member carrying the cheeks 4 and the rollers 5 This assembly and the mounting of the reciprocating members and the cheeks on the reciprocating axis

conform to the assembly and mounting described hereinafter with reference to Fig 11. The selector member 13 has a small projecting transverse tongue 131 which is held by a small bar 15 engaged in one of a series of pairs of notches 22 formed internally of the carrying lever 2 (Fig 4) Locating the small bar 15 in one pair of the notches 22 adjusts the amount by which the member 13 can slide, and consequently the amount of the displacement of the tensioning lever formed by the cheeks 4 with the rollers 5, according to whether three sprockets c, d, e, four sprockets or five sprockets are used. The mechanism thus mounted in the carrying lever 2 is protected by a coverplate 16 which is attached to the said lever for example by a screw 17 Alternatively the cover plate may be sprung into position or secured in any other known manner The whole thus has a neat appearance, and the. members are well protected. In another embodiment of the changespeed gear mechanism, illustrated in Figs 9 to 14, the lug 1 has a pivot 18 at its lower end, said pivot having a slotted head 181, and being locked on to the said lug between a collar formed on the pivot and a nut 19. A hollow cylindrical bush 20 is mounted so as to be able to rotate freely about the pivot 18, upon which the said bush is held by the head 181 of the pivot A helical spring 21 is disposed between the pivot and the bush 20 One end of the spring 21 is engaged and positioned in a hole 182 in the slotted head 181 of the pivot, while the other end of the spring is engaged and positioned in a hole in the bush 20. The carrying lever 22 is similar to that described with reference to Figs 1 to 8. However, the upper part of the lever 22 is so formed as to constitute a split collar 221, fixable on the bush 20; after adjustment of the transverse position of the lever 22, the collar 221 is locked by a screw 23 which is threaded into the body of the lever 22, the head 231 of said screw abutting against the upper part of the collar. The head 231 of the screw 23 is recessed to receive the sheathing 121 of the cable 12. The cable 12 extends axially through the screw 23, which is apertured for this purpose, and is disposed internally of the hollow lever 22 for the purpose of being fixed by a screw 241 to a movable member 24 which is coupled to the small chain 14 The crosssection in Fig 12 illustrates the hollow part of the lever 22 in which the member 24 can slide, said member being formed, for 785,532 displacement of the reciprocating device with the cheeks 4 and the rollers 5 has to vary, while being limited in each case For this purpose, the selector member

24 has a lateral stepped shoulder 243 intended to abut against a stop which limits the amount by which it can slide in the lever 22 This stop is formed by the head 311 of a threaded rod 31 which transverses a slot 223 formed in a side wall of the hollow part of the lever 22 and also transverses a plate 32 which can slide on one lateral face of the lever 22 The plate 32 is intended to mask the slot 223 whatever the position of adjustment of the rod 31 A nut 33 serves to lock the rod 31 with the head 311 in any selected position of adjustment The plate 32 may as shown, have a cranked finger 321, which is adapted to co-operate with a scale marked on the cover-plate 34 fitted to the front face of the lever 22 and secured in position by crimping, force fit, by a screw 35 or by a combination of these means The mechanism fitted in the lever 22 is thus perfectly protected. The amount by which the carrying lever 22 can be pivoted is limited in both directions by virtue of the provision of a plate 36, in the form of a sector fast with the bush 20. The plate 36 projects axially of the bush 20 and into the plane of the lug 1 which is formed with a cut away portion of sector shape in order to accommodate said plate 36, the ends of this cut-away portion serving as abutment means for the plate 36 and the pivoting assembly (Fig 14). Following this description, the functioning and the advantages of this change-speed gear mechanism will be evident in particular the articulated mounting of the lever 22 and the bush 20 The resilient pressure system acting on the lever 22 is entirely covered and protected and the whole, and particularly the rollers 5, can be rapidly adjusted in relation to one of the end sprockets on the wheel hub This adjustment is made easy and convenient by the fact that the upper part of the carrying lever 22 is made in the form of a collar The device 31 32 which adjusts the amount of the displacement of the telescopic reciprocating system is also effective, convenient and simple The same applies to the device intended to limit the amount of pivoting of the lever 22 and the whole mechanism. Figs 15 and 16 illustrate a simplified embodiment of the pivotal mechanism of the carrying lever 22 This pivotal mechanism comprises a bush 37 which is secured to the lug 1 supporting the change-speed gear mechanism by a bolt 38 having a nut The collar-shaped part of the lever 22 is so mounted on the bush 37, that axial adjustment thereof will be possible A plate 39 is fixedly screwed on the bush 37 and also relatively to the lever 22 in such a way as to provide two principal angular limiting positions of the lever 2 i, said plate being adapted to co-operate with a sector shaped recess formed in the lug 1 in such a manner as to provide a normal operating position 70 (Fig 15) and a position pivoted rearwards (Fig 17) which facilitates the fitting and

removal of the wheel for repairs. In this embodiment the lever 22 is not fitted so as to pivot resiliently during 75 operation It is fixed in a predetermined angular position A spring is no longer fitted in the axis 37 Construction is simplified. more economical and lighter Chain tension is then ensured solely by the spring 27 in 80 the reciprocating device. Another embodiment, which is still further simplified, is illustrated in Figs i S and 19. In this case an axle 40 of polygonal crosssection (hexagonal for example) is attached 85 by brazing, rivetting, screwing or other means to the supporting lug 1 The collar present at the upper part of the lever 22. is locked on the axle 40, after transverse adjustment It should be understood that 90 the aperture in the collar of the lever is of a form corresponding to the cross-section of the axle 40 It is thus possible to provide well-determined different angular positions for the lever 22 Without departing from 95 the scope of the invention, it is possible to make the axle fast with the supporting lug 1. and to provide the same with grooves. notches or other means formed in accordance with the generatrices of the axle, the aperture 1110 in the collar being formed to co-operate therewith. It may be pointed out here that in all embodiments the supporting lug 1 can be omitted and replaced by an extension 105 brazed to the lug 07 of the frame or directly formed by the said lug of the frame. The lever 2 could be made as a solid member with pieces attached thereto for limiting the movement of the reciprocating 110 device This could be done for instance by providing notches in a solid lever adapted to receive the bar 15 to limit the movement of the chain 14 or by fixing notched members to the lever 2 to receive said bar 15 115


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