Telescopic Lifting Jack

8/12/2019 Telescopic Lifting Jack

http://slidepdf.com/reader/full/telescopic-lifting-jack 1/26

1.ESTABLISHING THE LOADS THAT STRESS THE ELEMENTS

OF THE TELESCOPIC LIFTING JACK

Fig 1.1

2. MAIN SCREW CALCULUS

2.1 Choosing h! "#!$i#%I is &hoos!n OL '( STAS '))

2.2 D!sign &#%&*%*s

+ Lo#, &#%&*%#ion cQ - No

/01(31(2))).1"#4 N QQc =⋅=⋅=β

1.1..).1=β N Q 1(2))"#4 =

+ Inn!$ ,i#"!!$ o5 h! h$!#, 'd - ""

/0(.21)

1(366' mm

Qd

ac

c=

⋅

⋅=

⋅

⋅=

π σ π

/03)....6) MPaac =σ

+ Choosing h! s#n,#$, h$!#,

1



I is &hoos!n $#!7oi,#% h$!#, T$ 24 SR ISO 28)6- 9ih h! "#in

,i""!nsions #s sho9n in Fig 2.1 #n, T#:%! 2.1

Fig 2.1

T#:!%*% 2.1

No"in#%

Di#"!!$

Pi&h M!,i*"

Di#"!!$

E4!$io$

Di#"!!$

In!$io$ Di#"!!$ Ang%!

mmd - mm p- mm Dd -22 = mm D -6 mmd -

' mm D -1 °-α

'2 3 28 '' 2 23 °')

2.' Ch!&;ing h! s!%5<%o&;ing &on,iion

+Th! h$!#,s i&hing #ng%!

°=⋅

=⋅

= (3-'28

3

2

2π π

β arctg d

P arctg

+ A#$!n 5$i&ion #ng%!

°=== (.3

2

')&os

11-)

2&os

=arctg arctg

α

µ ϕ

12-)...11-)= µ 5o$ s!!%

· S!%5<%o&;ing &on,iion=

2 ϕ β <

2β > 3.76 < 6.78= =

2.6 Ch!&;ing # &o"os!, s$!ss!s

2



Fig 2.'

( )

132

'21)

=

=+=

+⋅=⋅=

l

c

l f

H

d m

m H k l k l

/02.36

6

36

12'

263

6.'(2.3

263

'

2

'

6

'

"in"in

"in

mmd

d

d

A

I i

m H l

l k l

i

l

l

f

f

==⋅

⋅

≈=

=+=

=⋅=

===

π

π

λ

+ B*&;%ing ,o"#in

? %#si& :*&;%ing

a

c

f cc ≥=σ σ

−= '.'11 f σ 5o$ OL '(

1.22326.('16.1'1) =⋅−= f σ

((.=c

+ Th! s#5!@ &o!55i&i!n 5o$ :*&;%ing..'=ac

'. SECOND!" SC!E# C$C%$%S

'.1 Choosing h! "#!$i#%

+ I is &hoos!n OL'( STAS '))

MPae 1)1.2 ⋅=

'.2 C#%&*%*s o5 h! n*":!$ o5 *$ns o5 h! "#in s&$!9 n*

%o&#!, insi,! h! s!&on,#$@ s&$!9

6



(28.31)B23'2A

1(2))6

BA

6222

1

2==>=

⋅−⋅

⋅=

−⋅= z

p Dd

Q z

a π π

MPa pa 1'..(=

+ N*":!$ o5 *$ns

Fig '.1

+ I is &hos!n

7

1)73

=

≤≤

+ L!ngh o5 h! n*/0623( mm P z H pl =⋅=⋅=

'.'.Choosing h! !4!$io$ h$!#,

+ A,oing h! $!%i"in#$@ in!$n#% ,i#"!!$ o5 h! h$!#, mmd -'

+ C&oosin' t&e stan(ar(i)e( t&rea(

I is &hos!n $#!7oi,#% s#n,#$,i7!, h$!#, T$ 4 "" SR ISO 28)6

9ih "#in ,i""!nsions $!s!n!, in Fig*$! '.2 #n, T#:%! '.1



Fig '.2

T#:!%*% '.1

No"in#%

Di#"!!$

Pi&h M!,i*"

Di#"!!$

E4!$io$

Di#"!!$

In!$io$ Di#"!!$

mmd - mm p- mm Dd -22 = mm D -6 mm-

' mm D -1

3) 8 . 1 ) 1

'.6.Ch!&;ing h! s!%5<%o&;ing &on,iion

Th! h$!#,s ih&ing #ng%! 2β -,!g$!!s

°=⋅

=⋅

= 263.'.)

8

2

2π π

β arctg d

P arctg

+ A#$!n 5$i&ion #ng%!

°=== ).(

2

')&os

12-)

2&os

= arctg arctg α

µ ϕ

[ ]−= mm1-)...12-) µ 5o$ s!!% &#s i$on

S!%5<%o&;ing &on,iion

°=<°= ).(26.' =

2 ϕ β

'. Ch!&;ing # &o"os!, s$!ss!s

+ Th! o$sion "o"!n h# #&s on h! s&$!9 Nmm M t -

( ) ( ) /068.(66626-').(2

.)132))

2 2

=2 Nmmtg tg d

Q M M insII t =+⋅⋅=+⋅⋅== β ϕ

+ E55!&i! &o"$!ssion !nsion cσ - MPa

3



( ) ( ) /0(1.26

-'66

132))66222

)

2

'

MPa Dd

Qc =

−⋅

⋅=

−⋅

⋅=

π π

σ

+ E55!&i! o$sion !nsion t τ - MPa

( ) ( )/0))(868'.)

-'666113

68.(666

13

666

)

6

'

'

MPa

Dd d

M t t =

−⋅⋅

=

−⋅⋅

=π π

τ

+ E*i#%!n !nsion eσ - MPa

/0()/0(1.26))(.)6(1.26

/0)...3)

6

22

22

MPa MPa

MPa

ace

ac

act ce

=≤=⋅+=

=

≤⋅+=

σ σ

σ

σ τ σ σ

*. +,-ED N% C$C%$%S

6.1.Choosing h! "#!$i#%

I is &hos!n F& 2))

6.2.C#%&*%*s o5 h! n*":!$ o5 *$ns

+ N*":!$ o5 *$ns- 7

Fig 6.1

(



'.6B63A

132))6

BA

6222

1

2=

⋅−⋅

⋅=

⋅−⋅

⋅=

π π a p Dd

Q z

−= MPa pa 3.. 5o$ s!!%&#s i$on1)3 ≤≤ z ==Tr d

I si &hos!n 7 > 3 si$!

+ L!ngh o5 h! n* mm H pII

-

/0683 mm P z H pII =⋅=⋅=

6.' Ch!&;ing h! n*

6.6B!n,ing #n, sh!#$ing &h!&;ing



Fig 6.2

C#s I$on n* :!n,ing

( )

( )ai

ai

aii

MPa

mm P h

z h D

d DQ

σ π

σ

σ

σ π

σ

≤=⋅⋅⋅

−⋅⋅=

=

=⋅=⋅=

≤⋅⋅⋅

−⋅⋅=

((.(3()3.3

.)3132))'

/06...6)

/0()3.8)3'63'6.)

'

21

2

6

26

+ C#s i$on n* sh!#$ing

af f

af

af f

MPa

MPa

z h D

Q

τ π

τ

τ

τ π

τ

≤=⋅⋅⋅

=

=

≤

⋅⋅⋅

=

/038.23()3-3

132))

/0'..')

6

6.'.Choosing h! n* ,i"!nsions

+ E4!$io$ ,i#"!!$ o5 h! :o,@ mm De -

8



Fig 6.6

( ) mmmm D De ()8311)...6 =+=+=

+ E4!$io$ ,i#"!!$ o5 h! n!&; mm D g -

( ) /01()2)...13 mmmm D D e g =+=+=

+ H!igh o5 h! n!&; mmh g -

/01)/012... mmmmh g

==

6.6.Ch!&;ing h! n* # &o"os!, s$!ss!s

+ E55!&i! $#&ion !nsion MPat -σ

( ) ( ) /081.1(31()

1(2))66 222

6

2 MPa D D

Qe

t =−⋅

⋅

=−⋅

⋅

=π π

σ

+ E55!&i! o$sion !nsion MPat -τ

( ) ( )/081.2

31()()13

)8.866)

13

666

6

6

MPa

D D D

M

e

e

insII t =

−⋅⋅

=

−⋅⋅

=π π

τ

+ E*i#%!n !nsion MPae -σ

/06...6)

/022.21)))'23.)622.216 2222

MPa

MPa

at

at t t e

=

≤=⋅+=⋅+=

σ

σ τ σ σ

6..Ch!&;ing h! n!&;

+ C$*shing &h!&; MPa s -σ

( ) ( ) /03)/0.(

()

1(2))662222

MPa MPa D D

Qas

e g

s =≤=−⋅

⋅=

−⋅

⋅= σ

π π

σ

1)



+ Sh!#$$ing &h!&; MPa f -τ

/0..6)

/0(.(1)()

1(2))

MPa

MPah D

Q

af

af

g e

f

=

≤=⋅⋅

=⋅⋅

=

τ

τ π π

τ

6.3.Choosing #n, &h!&;ing h! s*, n* h# s!&*$!s h! n* in

h! #&;s :o,@

+ Choosing h! s*, n*

Fig 6.

I is &hos!n s*, n* M342""- 9ih no&h- &@%in,$i&#% in-

$!$!s!n!, in 5ig*$! 6.3

Fig 6.3

Th! 5$i&ion "o"!n on h! s*$5#&! o5 h! n!&; /0- m N Mg ⋅

/08(.11282

()

()1(2))1(-)

'

1

'

122

''

22

''

Nmm D D

D DQ M

e g

e g

g =−

−⋅⋅⋅=

−

−⋅⋅⋅= µ

−= 1(.) µ s!!%

+ Th! "o"!n in h! in Nmm M

s

-

/0.''628(.11282)8.866) Nmm M M M g insII s −=−=−=

. CALCULUS OF THE BOD

+ Choosing h! ,i"!nsions o5 h! :o,@

11



Fig .1

( )

( )

( ) /01)/0)...')

/011)('.1)8B2A

/01()612/0)...')

/011/012...1)

/0(/0...(

3(.../0(66()/03...2

1

"#41

mmmm D D

mm Dtg H D

mmmm H H

mmmm

mmmm

mmmm D D

bibe

cibi

t

eci

=+=

≅=+⋅=

=+=+=

==

==

°=°°=

=+=+=

γ

δ

δ

γ

− II

H in#%i"!# ,! $i,i&#$! # s*$*:*%*i s!&*n,#$

( ) /02181)61()/01)...)1 mmmmh H H H g pII c =+−+=+−+=

+ Ch!&;ing h! :o,@ # &o"$!ssion MPac -σ

( ) MPa

MPa D D

Q

c

ac

ci g

c

)..3)

/03.86

22

=

≤=−⋅

⋅=

σ

σ π

σ

+ Ch!&;ing h! *n,!$%@ing s*$5#&! # &$*shing MPa s -σ

( ) ( )/0-2...2

/01).211)1)

1(2))66

2222

MPa

MPa D D

Q

as

asbibe

s

=

≤=

−⋅

⋅=

−⋅

⋅=

σ

σ

π π

σ

3. CUP CALCULUS

3.1.T!%!s&oi& %i5ing #&; &*

+ Choosing h! in 9hi&h &onso%i,#!s h! &* o h! "#in s&$!9 MPa p-

12



( ) ( ) MPa p

p MPad d

Q p

a

a

c

6)..2

/03.1'

1(2))66222

)

2

=

≤=

−⋅

⋅=

−⋅

⋅=

π π

+ Choosing cylindrical slotted screw and cylindrical plug which prevents

axial displacement of the cup

It is chosen a slotted cylindrical head screw and cylindrical plug M8x1 STAS717 !roup A"#8# $hose dimensions are represented in %igure &#1

Fig 3.1

+ Chec'ing wea'ened section of the screw head composite applications

Fig 3.2

1'



/0)

/0)'.228.1)6(88.16

/08.1)26

).23261313

/0(88.126

1(2))66

/02'22'/022

2222

''

22

'

MPa

MPa

MPad

M

MPad

Q

mmmmcd d

ac

act ce

ci

f

t

ci

c

cci

=

≤=⋅+=⋅+=

=⋅

⋅=

⋅

⋅=

=⋅

⋅=

⋅

⋅=

=−⋅−=−⋅−=

σ

σ τ σ σ

π π τ

π π σ

(. EFFICIENC CALCULUS

E55i&i!n&@ o5 h! !%!s&oi& %i5ing #&;

+ If using a spigot to slip (etween the screw head and cup

( ) ( )

'.1

'

'28(3-'(-3

8.2

'

222

''

2

)

2

'

)

'

2

2

=

2=

−

−⋅++

=

−

−⋅⋅++

=

tg

tg

d d

d d

d tg

tg

c

c µ β ϕ

β η

8. /E 0E/ODO$O1" O+ DES,N1N,N1 2E!,C$ !C/E

0EC/N,S0

.1.M!&h#nis" s;!&h

16



Fig .1

.2 Th! h#n,%! %!ngh &#%&*%*s

.2.1 Mo"!n*% n&ooi!o$ o#% / N""0-M i

/0121(16).121(16863)).2326 Nmm M M M M ins f mit ≅=+=+==ΙΙ

.2.2 Th! #&ing 5o$&! o5 on! 9o$;!$- N F m -

/ N0'))...1)F" =

I is &hos!n F">'))0N/

.2.' Th! &#%&*%*s %!ngh o5 h! h#n,%!- mm Lc -

/0(.'6('))11

121(16mm

F n K

M L

m

it c =

⋅⋅=

⋅⋅=

n > 1 s#* 2 ? no. o5 9o$;!$s

n > 1

; > 1

.1.1. L!ngh o5 h! h#n%,!- mm L-

'8/0(.'8()(.'6() ≅=+=+= mml L L c

1/0)) =−−= n for mml

.2.L!ngh!n!$ &#%&*%*s.2.1. L!ngh!n!$ %!ngh mm L p -

/03)

/0)...)

/06.'13)21.1'88

/021.1'8'8'.)'-)

mml

mml

mml L L L

mm L L

m p

m

=

=

=+−=+−=

=⋅=⋅=

.2.2. L!ngh!n!$ ,i#"!!$ mmd pe -

1



( ) ( )

/012)

/02)8.1812)

)6.'1')11'2'2''

)

mmd

mml L F nk

d

ai

ai

pm

pi

=

≅=⋅

−⋅⋅⋅⋅=

⋅

−⋅⋅⋅⋅=

π σ π

Di#"!$*% !4!$io$ #% $!%*ngio$*%*i mmd pe-

mmd pe 22=

!$i5i&#$!# $!%*ngio$*%*i %# so%i&i#$!# ,! n&ooi!$! /MP#0-iσ

/08.)B1822A

22B3))6.'1A')11'2

BA

BA'26666

MPad d

d l l L F nk

pi pe

peo pm

i =−⋅

⋅−−⋅⋅⋅⋅=

−

−−⋅⋅⋅=

π π σ

/012)..1))/08.) MPa MPaai =≤σ

.'.R#&h! 9h!!% &#%&*%*s

Choosing h! "#!$i#%

I is &hos!n OLC 6 STAS ))2

.'.1. Choosing h! ,i"!nsions

+ Wh!!% ,i"!nsions

( )

/0

/03-1-1...3-1

mm D

mmd D

m

m

=

=⋅=⋅=

= z

( )

/0.23

/0.231-)B2..1A-)

/0'3.8'3.1)

/036.(('3.1)

/0'3.1)2(.1(3-)-)...3-)

/02(.1(2

2

mma

mmd a

mmh D D

mmh D D

mmbh

mm z

Db

me

mi

m

=

=−⋅=−⋅≤

=+=+=

=−=−=

=⋅=⋅=

=⋅

⋅=

⋅

⋅≤

π π

13



Fig .2

.'.2. Ch!&;ing h! $#&h! 9h!!% *n,!$ s$!ss!s

+ Ch!&;ing h! &og # :!n,ing MPai -σ

/011)

/012)...1))

/08

/01)...

/022.2(33

).121(1622

/088.'11)2(.1(

'3.1)22.2(33''

1

22

1

MPa

MPa

mm

mm

N D

M F

MPab

h F

ai

ai

m

it

aii

=

=

=

=

=⋅

=⋅

=

≤=⋅

⋅⋅=

⋅

⋅⋅=

σ

σ

δ

δ

σ δ

σ

+ Ch!&;ing h! &og # sh!#$ing MPa f -τ

/01))...)

/0(.1(1)2(.1(

22.2(331

MPa

MPab

F

af

af f

=

≤=⋅

=⋅

=

τ

τ δ

τ

+ Ch!&;ing h! &on#& s*$5#&! o5 h! &og # &$*shing

/012)...1))

/033.28'3.1)8

22.2(331

MPa

MPah

F

as

as s

=

≤=⋅

=⋅

=

σ

σ δ

σ

+ Ch!&;ing h! #ss!":%@ on o%@gon#% &ono*$ # &$*shing MPa s -σ

1(



Fig .'

/012)...1))

/01)11)1

/0)3.1)2.231)8

).121(16222

MPa

mm

MPaa

M

as

t

as

t

it s

=

=+=+=

≤=⋅⋅

⋅=

⋅

⋅=

σ

δ δ

σ δ

σ

.6.R#&h! &#%&*%*s

.6.1. Choosing h! "#!$i#%

I si &hos!n OLC 6 STAS ))2

8.*.. C&oosin' t&e (imensions

+ )ocating ratchet si*es in mm

(.1212

')

B1...-)A2

/0')2B3...6A

/0'3.6''3.1)2

()B6...2A

2

/0.68-)B3-)...-)A

11

1

1

=⋅−=⋅−=

=+=+=

=++=++=

=⋅==

δ

δ δ

D

h

mmd D

mmh D

l

mm

pe

e

+ R#&h! si7!-in ""

/0132.1312(.1(

1

/02.2(1).6(.12

2

112

mmb z

Dh

mmhl

m

t

≅=−−⋅

=−−⋅

=

=++=++=

π π

δ δ

1



Fig .6

.6.'. Ch!&;ing h! $#&h! # !4&!n$i& &o"$!ssion

+ To#% !nsion MPai -σ

1)8.).61)-)

/012)...1))

/0.3213'3.1)

1)22.2(3333

11

22

2

11

=⋅−+=−+=

=

≤=⋅

⋅⋅=

⋅

⋅⋅=

δ δ δ

σ

σ σ

t

ai

aii

a

MPa

MPahh

a F

.6.'. R#&h!s in &#%&*%*s

.6.6. Choosing h! "#!$i#%

I is &hoos!n OL ) STAS ))2

.6.. Si*e selection

It is recommended choosing a smaller (olt head+ which will process afixation pin hole# Choose recommended (olts with diameter &+ 8+ 1, and 1-mm#

mmd b 12=

Ch!&;ing h! in # s$!ss!s

+ Ch!&;ing h! in # sh!#$ing MPa f -τ

18



12

.6(.12

2

1.1661

1)22.2(33

/0)...3)

/0').1312

1.16666

112

2

11

22

=+=+=

=⋅=⋅=

=

≤=⋅

⋅=

⋅

⋅=

δ

τ

τ π π

τ

ha

a

a F

MPa

MPad

af

af

b

f

Fig..

+ Ch!&;ing h! in # &$*shing

/0)...3)

/0'.16'3.1)12

1.166

MPa

MPahd

as

asb

s

=

≤=⋅

=⋅

=

σ

σ σ

+ Ch!&;ing h! in # :!n,ing

/012)...1))

/028.3812

(.121.1661313''

MPa

MPad

h

ai

ai

b

i

=

≤=⋅

⋅⋅=

⋅

⋅⋅=

σ

σ π π

σ

2)



8. EC/N,C$ SEC%!," #O!4 !%$ES

Th! "#in 9o$; s#5!@ $*%!s #$!

< J#&; $!#i$ i5 is 5#i%*$! 9i%% :! "#,! on%@ :@ s!&i#% !o%!

< J#&; is no ins!$!, # $#n,o" %o#,- :* on%@ in %#&!s s!&i#%%@

,!sign!, o %o#,

21



< To $!!n #&&i,!ns- i5 h! %o#, is %i5!, #5!$ h! in!$!nion

*n,!$ high %o#,- 9i%% #%9#@s !ns*$! %o#,

< Fo$ # :!!$ 5*n&ioning o5 h! #&; is $!&o""!n,!, %*:$i&#ion

!$io,i& &o*%ing o5 h! #&; s&$!9s

< No $*nning #noining o5 #&; s&$!9s #n, &o*%ings in *s!- i!

9hi%! #&; is $!*i$!, o # &!$#in

< Wi%% no %i5 # %o#, g$!#!$ h#n in,i&#!, in &#%&*%#ions

< To %i5 h! %o#, i 9i%% no *s! h! $#&h! ,$i! "!&h#nis"

$oi,!, in h! &#%&*%#ions on%@ %!ngh!n!$s

< Us! o5 #n@ oh!$ @! o5 !4!nsion &#n %!#, o 5o$&!s h# &#n %!#,

o h! :$!#;ing o5 h! "!&h#nis"- #n, so o &#$ #&&i,!ns

5. S%O!,N1 SE0EN !E1!D,N1 /E C/O,CE

O+ /E 0E!,$S /E 9$N4S ND COS!%C,2E

SO$%,ONS +O! /E 0,N !S O+ /E

:C4;N%S 9O$S

Fo$ $o!$ 5*n&ioning o5 h! #&; h! s&$!9s n!!, o :!

no on%@ $!sis#n :* #%so $igi,. On h# :#sis i 9i%% :! &hos!n o

"#n*5#&*$! s&$!9s 5$o" o$,in#$@ "#!$i#%s OL- #s 5o%%o9s

h! "#in s&$!9 is $!&o""!n,!, OL '(- 5o$ s!&on,#$@ n* #n,

s&$!9 5i4#ion is $!&o""!n,!, OL ). Fo$ h! s&$!9 #n, n*

n!!, o :! *s!, $#!7oi,#% h$!#, 5i4!, o in&$!#s! h! $igi,i@

o5 h! "!&h#nis". ! 9h!n o $!!n 9!#$ o h! &* #ss!":%@

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i &#n :! &hos!n # h!# $!#!, o$ h!$"o&h!"i&#% s!!%. Th!

"#n*5#&*$ing o5 h! $#&h! "!&h#nis" o!$#!, ho$i7on#%%@

&#n #%so *s! o$,in#$@ "#!$i#%s- %o9 #%%o@ s!!%s 5o$ g!n!$#%

!ngin!!$ing STAS )) 2. In h! "#;ing i 9i%% :! *s!,

&o""!$&i%#% *:!s 5o$ !4!nsion. Wh!n $*nning h! ,$i! s$ing

"!&h#nis" 9i%% :! *s!, ho $o%%!, #n, h!# $!#!, s$ing s!!%#n, 5o$ h! :%#n; s$ings is *s!, &#$:on s!!% 9i$! STAS 8

55. #!,EN E2,DENCE ON /E C/O,CE O+

0E!,$S /$++,NS/EDED ND CONS!%C,2E

SO$%,ONS ON /E 0,N ,CES ,N /E

0EC/N,S0S CONS!%C,ON

Th! #&; is # "!&h#nis" *s!, 5o$ %i5ing ,i55!$!n #s;s-

!s!&i#%%@ 5o$ #*o $!#i$s #n, in!$!nions- 9hi&h is &o"os!, 5$o" #

s&$!9<n* "!&h#nis".

Consi,!$ing h# h! %i5ing #s; is s#i&#%%@ #%i!,- 5o$ h!

s&$!9<n* "!&h#nis"- 9! &hoos! $#!7oi,#% h$!#,- 9hi&h #%ho*gh

h#s # %o9!$ $#!, &##&i@ h!n h! s*#$!, on! i h#s # :!!$ si55n!ss

#n, # h! s#"! i"! !ns*$!s # goo, #%ign"!n o5 h! n* on h! s&$!9.

A%so his @! o5 h$!#, #%%o9s h! $#ns"ission o5 h! #s; in :oh

,i$!&ions- #n, h#s h! #,#n#g! h# &#n :! !4!&*!, :@ "i%%ing 9ih

high $o,*&ii@.

In &hoosing h! "#!$i#%s 9! ;! in "in, h# h! o!$#ion is

,on! "#n*#%%@- #n, h! #&; h#s # $!%#i!%@ s"#%% i"! o5 o!$#ing-

:* #%so in h! 5#& h# h! s&$!9<n* "!&h#nis" is h! "os $!*!s!,

&o"on!n o5 h! #&;. Fo$ his $!#sons 9#s &hos!n- 5o$ "#n*5#&*$ing

h! s&$!9<n* "!&h#nis"- #n, h! "#o$i@ &o"on!n #$s- %#"in#!,

s!!% OL) STAS ))2 ? ). OL) s!!% #%%o9s # $o!$ $o&!ssing :@

&*ing #n, i is no %ong!$ n!&!ss#$@ o ,!!%o h!# $!#"!ns o

2'



i"$o! is "!&h#ni&#% $o!$i!s. OL) %#"in#!, %#!- o5 9hi&h h!

%!!$s 9!$! !4!&*!,- h#s #n in&$!#s!, $!sis#n&! o :*&;%ing ,*! o h!

g$#ins o$i!n#ion in h! s#"! ,i$!&ion ? #5!$ h! %!!$s #4is ? #5!$

%#"in#ion. Fo$ h! 5oo<%#! o5 h! #&;- 9#s &hos!n &#s s!!% OT)

STAS 3)) ? )- :!&#*s! i no %ong!$ $!*i$!s 5*$h!$ $o&!ssing :@

&*ing. Fo$ h! #$&h o5 h! #&ing "!&h#nis"- 9#s &hos!n #$&h s!!%"#$; OLCA- s!!% h# gi!s h! #$&h #!$#g! $o!$i!s.

In &hoosing h! "#!$i#%s 9! h#, in "in,- #%so h! &os o5 h!

&hos!n "#!$i#%s- #i"ing o o:#in high *#%i@ $o,*&s- # # %o9!$ &os

o5 $o,*&ion.

5. E/N,C$ SEC%!," SND!DS O+ #O!4

On! n* %i5ing #&; is in&%*,!, in h! %i5ing "!&h#nis"s- o5 9hi&h

&#*s! "*s :! $oi,!, # s!$i!s o5 ins$*&ions #n, "!#s*$!s o

$!!n #n, #oi, #&&i,!ns # 9o$;.

Li;! #n@ %i5ing "!&h#nis"- h! %i5ing #&; sho*%, !ns*$! h!

s!%5<:$#;ing &on,iion- "!#ning h# 9h!n h! #&; o!$#ing sos- i

9i%% no 5#%% :!%%o9 h! #&ion o5 h! %i5ing #s;. Th! s!%5<:$#;ing&on,iion is !ns*$!, :@ ,! s&$!9<n* "!&h#nis".

Th! *s!$s o5 his %i5ing "!&h#nis" 9i%% :! $#in!, on ho9 o

9o$; &o$$!&%@. I is $!&o""!n,!,

- Th! #&; 9i%% :! *s!, on%@ 5o$ "#n*#% #&ing

- I 9i%% no :! *s!, 5o$ %o#,s g$#!$ h!n 2))N. Fo$ his

$!#son 9! 9i%% "#$;- # # isi:%! %#&!- h! "#4i"*" %i5ing

%o#,

- Th! %i5ing %o#, sho*%, no #%%o9 ho$i7on#% "o!"!n- o

#oi, h! in!$ing o5 h! #&;. A%so is 5o$:i,,!n o %i5 h!

%o#,s #n&ho$!, on h! g$o*n,- 5o$ no o!$%o#,ing h! #&;

- Th! #&; i 9i%% no :! * ,i$!&%@ on h! g$o*n,- :!&#*s! is

$!sis#n&! is *n;no9n. In his 9#@ *n,!$ h! #&; 9i%% :!

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ins!$!, # %#!- 5$o" # "#!$i#% s*55i&i!n%@ s$ong h# 9i%%

no #%%o9 h! s%i,ing o5 h! #&; in ho$i7on#% %#n!

- Ch!&;ing h! !&hni&#% $o!$ 5*n&ioning o5 h! #&; :!5o$!

*sing i

- Th!$! 9i%% no :! *n#!n,!, %o#,s %!5 on h! #&;

- Th! #&; so$#g! i 9i%% :! "#,! s*&h h# s*:<#ss!":%i!s

,!5o$"#ions 9i%% :! #oi,!,- in ,$@ %#&!s s*&h h# h!

&$!9<n* "!&h#nis"- o4i,#ions 9i%% :! no 5#o$!,- 9hi&h

9i%% #gg$##! o!$#ing h! #&; 5o$ h! #!#$#n&! o5

#,,iion#% 5$i&ion 5o$&!sI 9i%% $!g*%#$%@ :! &h!&;!,

< Th! :o%s o :! $oi,!, 9ih !%#si& $ings- 5o$ s#5!@

- Th! %!!$s #$! no ,!5o$"!,

- Th! &* o :! 5i4!, 9!%% in h! s*o$

< Th! s&$!9<n* "!&h#nis"- no $!s!ning #,#n&!, 9!#$ #n,

i 9i%% :! !$"#n!n%@ g$!#s!, o $!,*&! 5$i&ion 5o$&!s #n,

i""#*$! 9!#$

< Ch!&; h# no &$#&;s !4iss on ,i55!$!n #$s o5 h! #&;

53. !E+!ENCES

1. ALEANDRU- P. s.#. M!&#nis"!- o%. II. Uni!$si#!# ,in B$#so-

186.

2. DRAGHICI- I. s.#. In,$*"#$ ,! $oi!&#$! in &ons$*&i# ,! "#sini- o%.

I. B*&*$!si- E,i*$# T!hni&#- 181.

'. DRAGHICI- I. s.#. O$g#n! ,! "#sini. C*%!g!$! ,! $o:%!"!. B*&*$!si-

E,i*$# Di,#&i&# si P!,#gogi&#- 18).

2



6. GAFITANU- M. s.#. O$g#n! ,! "#sini- o%. I. B*&*$!si- E,i*$#

T!hni&#- 181

. JULA- A. s.#. O$g#n! ,! "#sini- In,$*"#$ !n$* $oi!&*% ,! #n n$. 1-

Uni!$si#!# ,in B$#so- 183.3. JULA- A. s.#. O$g#n! ,! "#sini- o%. I. Uni!$si#!# ,in B$#so- 183

(. MOLDOEAN- GH. s.#. C#%&*%*% si $oi!&#$!# 5o$"!i #$:o$i%o$

,$!i. B$#so- E,i*$# L*4 Li:$is- 188

. C*%!g!$! ,! no$"! si !4$#s! ,in s#n,#$,! !n$* $oi!&#$!#

!%!"!n!%o$ &o"on!n! #%! "#sini%o$- o%. I si II. Uni!$si#!# ,in

B$#so- 186

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Telescopic Lifting Jack

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