U.S. Patent 2,542,271, entitled "Device for creating oscillations" to Alverez, 1951.

7/26/2019 U.S. Patent 2,542,271, entitled "Device for creating oscillations" to Alverez, 1951.

1/9

F e b . 2 2 0 , 1951 o . J . ALvAREi 2 , 5 4 2 , 2 7 1

D E V I C E F O R C R E A T I N G O Y S C I I L L A T I O N S

Filed July 24, 1 9 4 8 ' > 3 Sheets-Sheet l

IN

V

EN O R .

0r4

W

L

MAKEZ

BY

W-WJ


2/9

F e b .

2 0 ,

1 9 5 1

o . J .

ALVAREZ

2 , 5 4 2 , 2 7 1

DEVICE

FOR

CREATING OSCILLATIONS

F i l ' e d

J u l y

2 4 ,

1 9 4 8

s

S h e e t s - S h e e t

2

I N V E N T O R .

Oar/1W0 4

MAKfZ


3/9

2 , 5 4 2 , 2 7 1

e b . 2 0 ,

1951

o .

J .

ALVAREZ

D E V I C E F O R C R E A T I N G O S C I L L A T I O N S

3 Sheets-Sheet

3

Filed

July

2 4 , 1 9 4 8

. z

R

2

m

BY


4/9

Patented Feb. 2 0 ,

1 9 5 1

2 , 5 4 2 , 2 7 1

UNITED STATES PATENT OFFICE

2 , 5 4 2 , 2 7 1

DEVICEFOR

CREATING

OSCILLATIONS

O c t a v i o J o s e A l v a r e z ,

New

York, N . Y . , a s s i g n o r ,

by mesne assignments,

o f

one-fourth

t o

Maria

e Reitzes-Marienwert, New

York,

N.

Y.

A p p l i c a t i o n J u l y 2 4 , 1 9 4 8, S e r i a l N o . 4 0 , 5 0 6

( C l . 8 4 1 . 1 5 )

7 C l a i m s .

1

The

p r e s e n t i n v e n t i o n

r e l a t e s

t o

e l e c t r i c a l

musical

i n s t r u m e n t s ,

such

a s

e l e c t r i c a l p i a n o s ,

and

more

p a r t i c u l a r l y t o d e v i c e s f o r

c r e a t i n g a

l o n g i t u d i n a l l y

e x t e n d e d

m a g n e t i c

? e l d

and

a l s o

t o e l e c t r i c a l v i b r a t i o n p i c k - u p

arrangements usa

b l e i n

e l e c t r i c a l musical instruments and

a l s o i n

other

? e l d s .

I t i s an o b j e c t o f my r e s e n t invention

t o pro

duce

o n an l e c t r i c a l

musical instrument a piano

l i k e

t o n e .

I t i s

a f u r t h e r o b j e c t

o f my

p r e s e n t invention

t o

p r o v i d e

a

musical

instrument

adapted

t o p r o

duce p i a n o - l i k e t o n e s

without

the use o f s t r i n g s

and hammers.

I t

i s a

f u r t h e r

o b j e c t

o f my

present invention

t o

p r o v i d e

a

p i a n o - l i k e

instrument

with

means

f o r producing

p i a n o - l i k e

t o n e s which means

a r e

s u b s t a n t i a l l y l e s s

expensive and

not

s o e a s i l y

damageable a s the s t r i n g s and hammers o f pianos

o f

c o n v e n t i o n a l t y p e .

A

s t i l l f u r t h e r o b j e c t o f

my

invention i s

t o

p r o v i d e

an

instrument

which

p r o d u c e s mechani

c a l

o s c i l l a t i o n s which are

not

audible per s e but

a r e

adapted t o c r e a t e e l e c t r i c a l

c u r r e n t

o s c i l l a

t i o n s .

Another o b j e c t

o f

my p r e s e n t i n v e n t i o n c on

s i s t s

in new means f o r transforming

the above

mentioned n o n - a u d i b l e mechanical

v i b r a t i o n s

i n t o

e l e c t r i c a l

o s c i l l a t i o n s which a r e then trans

formed

i n t o o s c i l l a t i o n s o f

the

membrane o f

a

loud speaker

or car phone.

With the

above

o b j e ct s i n v i e w , a

d e v i c e f o r

c r e a t i n g

a

l o n g i t u d i n a l l y extended magnetic

? e l d u s a b l e i n

e l e c t r i c a l

musical instruments and

o t h e r ? e l d s

c o m p r i s e s

i n combinaton t h r e e l o n g i

t u d i n a l p e r m a n e n t m a g n e t i c

members a r r a n g e d

p a r a l l e l

and spaced from each other i n

such a

manner

t h a t t h e

middle

l o n g i t u d i n a l magnetic

member

p r o j e c t s

beyond

t h e

f r o n t

end

p o r t i o n s

i f

t h e o u t e r l o n g i t u d i n a l

magnetic

members, and

an

e l e c t r i c a l l y conductive member arranged b e

tween

t h e

o u t e r l o n g i t u d i n a l

magnetic

members

contacting the same

and

the rear

end

portion

o f

t h e

middle l o n g i t u d i n a l magnetic member i n

such a

manner

that the

front end portions

o f

t h e

o u t e r


members

p r o j e c t

beyond t h e

e l e c t r i c a l l y

c o n d u c t i v e member.

10

1 5

20

25

30

2

I have found i t o f advantage t o use two outer

l o n g i t u d i n a l r e l a t i v e l y s t r o n g permanent

o r

e l e c e

tro-magnetic members and t o ma ke the

middle

magnetic

member weaker, i . e .

t o

use i n the mid

d l e a weaker permanent o r electro-magnetic

member.

I have found

that

with an arrangement

o f

the

above type I am a b l e

t o

createas w i l l be

d e s c r i b e d f a r t h e r below i n d e t a i l - a l o n g i t u d i

n a l l y

extended

magnetic ? e l d p r o j e c t i n g from

t h e

f r o n t end o f the

middle weaker

magnetic mem

ber

de?ned a b o v e .

I f the above arrangement i s used f o r c r e a t

i n g t h e

d e s i r e d v i b r a t i o n s

i n an e l e c t r i c a l

sound

reproducing instrument,

I use

a s

middle mag

n e t i c member

a l o n g i t u d i n a l permanent magnetic

v i b r a t i o n r e e d .

The

e n t i r e

d e v i c e f o r

c r e a t i n g

the d e s i r e d mag

n e t i c

v i b r a t i o n s

comprises-if used i n an e l e c

t r i c a l piano-a turnable

holding

arm, a

mag

n e t i z e d f r e e l y v i b r a t a b l e s t e e l reed secured t o

the

t u r n a b l e

holding arm,

two l o n g i t u d i n a l perma

nent

magnetic members s e c u r e d a l s o t o t h e hold

i n g arm

p a r a l l e l t o

and

spaced

from the mag

n e t i z e d

f r e e l y

v i b r a t a b l e

s t e e l

reed

s o

that

the

magnetized

f r e e l y

v i b r a t a b l e

s t e e l r e e d

p r o j e c t s

beyond

t h e

f r o n t end p o r t i o n s

o f t h e

l o n g i t u d i n a l

permanent m a g n e t i c

members,

p i v o t i n g means

t u r n a b l y s u p p o r t i n g

t h e t u r n a b l e

h o l d i n g

arm,

and

s t o p

means arranged i n the path

o f

turn~

ing

o f

the

turnable holding

arm.

In

o r d e r

t o

p r o p e r l y a d j u s t t h e v i b r a t i o n s o f

the holding arm i t s e l f s o a s not t o i n t e r f e r e t o

an undesired

degree with

the

v i b r a t i o n s o f the

r e e d , I provide adjusting means,

e .

g . an

adjust

i n g

s c r e w , f r e e l y

t u r n a b l y

screwed i n t o

t h a t

end

p o r t i o n

o f the holding arm t o

which

the reed

i s

secured

s o a s t o

enable

varying o f

the length

o f the holding arm, enabling adjustment

o f

the

o s c i l l a t i o n s o f t h i s

arm.

In accordance

with

a p a r t i c u l a r l y p r e f e r r e d

embodiment o f my p r e s e n t i n v e n t i o n , the en

t i r e

arrangement

includes

an electrical

vibra

45

P r e f e r a b l y , I employ a s

e l e c t r i c a l l y

conductive

member a s l i g h t l y

magnetic

member

arranged

between the o u t e r l o n g i t u d i n a l magnetic mem

bers

contacting the same and the

rear end

por

t i o n

o f the middle l o n g i t u d i n a l magnetic

mem

ber in such a manner that the front end por

t i o n s

o f

t h e o u t e r


members

p r o j e c t

b e y o n d

t h e

s l i g h t l y m a g n e t i c member.

50

55

t i o n pick-up arrangement

comprising

i n c o m

b i n a t i o n two e l o n g a t e d

s t a t i o n a r y i n d u c t a n c e

c o i l s forming a s l o t between themselves

and

Wound

in

such a

manner

as

tocreate

in

a

com

mon e l e c t r i c a l c i r c u i t

o p p os i t e l y d i r e c t e d

e l e c ~

t r i c a l

c u r r e n t s ,

a turnable

holding

member, a

magnetized

f r e e l y

v i b r a t a b l e s t e e l r e e d s e c u r e d

t o t h e t u r n a b l e

holding arm, two l o n g i t u d i n a l

permanent

magnetic

members s e c u r e d a l s o

t o

the

holding arm p a r a l l e l t o

and

spaced from the

magnetized

f r e e l y

v i b r a t a b l e

s t e e l

r e e d

s o t h a t

t h e magnetized f r e e l y

v i b r a t a b l e

s t e e l r e e d


5/9

2 , 5 4 2 , 2 7 1

3

p r o j e c t s

beyond

t h e f r o n t

end

p o r t i o n s

o f t h e

l o n g i t u d i n a l permanent m a g n e t i c members, p i v ~

o t i n g

means t u r n a b l y s u p p o r t i n g t h e t u r n a b l e

holding

arm in

such a

manner

that the

same i s

movable between

i n o p e r a t i v e

p o s i t i o n

i n

which

t h e l o n g i t u d i n a l l y extended

magnetic

?eld c r e a t

e d by t h e magnetized f r e e l y v i b r a t a b l e s t e e l r e e d

i s not

p r o j e c t i n g

intothe s l o t between the

e l o n

g a t e d s t a t i o n a r y i n d u c t a n c e

c o i l s ,

and v i b r a t i o n

c r e a t i n g p o s i t i o n i n which

t h e

l o n g i t u d i n a l l y ex

tended

magnetic

? e l d

c r e a t e d by

t h e m a g n e t i z e d .

f r e e l y v i b r a t a b l e

s t e e l

r e e d i s p r o j e c t i n g i n t o

t h e

s l o t

between

the elong ated

stationary inductance

c o i l s , and stop means

arranged

in .thepath- of

turning

o f t h e turnable holding armso s to

i s

i n v i b r a t i o n c r e a t i n g

p o s i t i o n

i n

which t h e


e x t e n d e d magnetic

?eld c r e a t e d

by

t h e

magnetized f r e e l y v i b r a t a b l e s t e e l r e e d i s

p r o j e c t i n g

i n t o

t h e

s l o t

between t h e e l o n g a t e d

s t a t i o n a r y

i n d u c t a n c e

c o i l s . v

The novel f e a t u r e s which I

consider a s

charac

t e r i s t i c

f o r

my

invention are

s e t

forth

i n p a r t i c u '

l a r . i n t h e

appended

c l a i m s . The i n v e n t i o n i t s e l f ,

however, both a s t o

itsconstructon'and i t s : v

method o f

o p e r a t i o n ;

t o g e t h e r w i t h a d d i t i o n a l

o b j e c t s

and

advantages t h e r e o f ,

w i l l . be

b e s t

understood

from t h e

f o l l o w i n g d e s c r i p t i o n v o f

s p e c i ? c embodiments

whe n

read i n connection;

with

t h e accompanying d r a w i n g s ,

i n which:

F i g . _ 1

i s a

schematic

view of an

arrangement

f o r c r e a t i n g

a


extended

magnetic

? e l d ;

F i g . 2 i s a schematic View o f a modi?cation o f

t h e arrangement shown i n F i g . 1 ;

F i g s .

3 and 4 a r e

s t i l l

f u r t h e r modi?cations o i

t h e d e v i c e shown

n F i g .

1 ' ;

F i g .

5

i s

a

perspective

View

o f -

a

d e t a i l o f

an

e l e c t r i c a l piano i n accordance with my

p r e s e n t

i n v e n t i o n

i n

i n o p e r a t i v e p o s i t i o n ,

embodying t h e

arrangement shown in

F i g . 4 ; and

F i g . 6 i s a perspective v v i e w o f a part . o f . t h e

e l e c t r i c a l p i a n o . shown i n F i g . 5 ,

i n

o p e r a t i v e

p o s i t i o n .

In F i g . l , I have

sh o w n an

arrangement which

i n c l u d e s

. t h r e e

permanent m a g n e t s , n a m e l y , . , a

middle magnet

I l l , and two o u t e r magnets

I I

and

I 2 . o f

same p o i a r i t y - These

o u t e r magnets.

H

and

' 1 2

a r e

arranged, a s

. c l e a r l y s h o w n ,

s l i g h t l y ,

i n c l i n e d

towards

t h e

middle

magnet I 0 .

I

have fo und

that

i n

an

arrangementaof t h i s .

type the

two

o u t e r

magnets

l I and.l2

t o

. a

c e r t a i n

d e g r e e

compress

t h e

.magnetic

? e l d v

e m a n a t i n g .

from theend

1 3

. o f

t h e

middlemagnetll?rforme.

i n g

a somewhat

l o n g i t u d i n a l l y extended magnetic

? e l d . I 4 , a s c l e a r l y shown inFig;

l . > .

In .thearrangement.

sh o w n i n

Fig:

2 , . . t h e t w o

o u t e r

.magnets

5 5

l a n d . [dare arranged p a r a l l e l .

t o

the

middle magnet. I ' L . Also i n an a r r a n g e - '

ment o f t h i s

t y p e ,

a

r e a t i v e l y

l o n g i t u d i n a l l y e x e .

tended

magnetic ? e l d l8is formed at t h e . end

I Q

o f

the permanent magnet H.

As shown

in

F i g .

2 ,

the magnetic ?eldsZEl and

2 formed a t the upper e n d s . 2 2 and

2 3 , . r e s p e c -

t i v e l y , o f the o u t e r

magnets

v l 5 and I 6 a r e forced

outward.

b y

t h e . middle

magnet.

I T .

This

i s

always t h e c a s e i f

t h e

middle magnet i s

s t r o n g e r

than

t h e

?anking m a g n e t s .

I f ,

a s

s h o w n v

i n

: F i g . 3,-Iarrange between t h e

outer permanent. magnets

2 4

and 2 5 a member

2 6 o f ferrous m a t e r i a l , i . e . a material which i s

o nly

slightly magnetic

and

cannot

well

retain .

magnetic ?elds 2 1 and. 28

emanating at theends 2 9

and

3B o f thepermanent -

m a g n e t i s m , t h e

magnets 2 4 and

2 5 ,

r e s p e c t i v e l y , - w i 1 l b e a t t r a c t e d

3 5 .

50

55

60

85

7 5

4

by t h e

middle member 2 6 and

a bunch-like

mag

n e t i c ?eld

3 i w i l l be formed

a t the upper end

3 2 o f

the

member

2 6 .

I

have found that

I can

obtain

b e s t

r e s u l t s ,

i .

e .

a l o n g i t u d i n a l l y extended magnetic ? e l d , by a r

ranging between t h e o u t e r

permanent

magnets

3 3

and

3 4 ,

a s

s h o w n

i n F i g .

4 , a

block

3 5

o f

a

ferrous material not adapted t o serve as

a

perma~

nent magnet, andto

embed

t h e

middle

perma

nent ma g net

3 6

with

one

end

3 1 i n t o

the

b l o c k

3 5 .

The r e s u l t w i l l

b e

t h a t t h e magnetic ? e l d s

3 B and 3 9

emanating

from

t h e

t o p ends 4 3 and

i

o f the

permanent

magnets 3 3

and 3 4 ,

r e s p e c t i v e l y ,

w i l l b e . attracted by

the

iron bloc k

3 5

a s

i n d i c a t e d

by arrows 4 2 , and ( e n t e r t h e middle

permanent

engage

the same when the turnable

holding

armr

magnet 3 6 . T h i s , i n t u r n ,

w i l l

i n c r e a s e t h e i n

t e n s i t y o f

t h e

magnetic

? e l d c r e a t e d by t h i s

middle

permanent

m a g n e t ,

a n d , f u r t h e r m o r e , w i l l f o r c e

part

o f

the

magnetic ?elds 3 8

and

3 9 t o

p a s s

a l o n g o p p o s i t e f a c e s o f t h e middle permanent

magnet 3 5 , creatinga

l o n g i t u d i n a l l y ,

e x t e n d e d

magnetic

?eld

4 3

a t

the

t o p , end 4 4 o f

t h e

perma

nent magnet

3 6 ,

a s c l e a r l y

shown

in

F i g .

4 .

I t

should be

noted

t h a t

i n t h e

drawingl have

not shown t h e ?ux l i n e s but

t h a t t h e

magnetic

? e l d s i n d i c a t e d i n t h e drawings with

r e f e r e n c e

n u m e r a l s 1 4 , I 8 , 2 1 ,

2 8 ,

3 | , 3 8 ,

3 9 ,

a n d l i i ' l ' a r e

r e p r e s e n t a t i o n s

o f ,

t h e p o s i t i o n o i

i r o n

d u s t

f o l .

l o w i n g t h e ?dx i n e s .

I ' w i s h t o n o t e t h a t t h ' e middle

magnets d e

scribedabove might have any d e s i r e d s h a p e . v I t

i s o n l y important t h a t they

a r e

l o n g i t u d i n a l .

Arrangements

o f . t h i s

type

might

b e

used f o r .

v a r i o u s

p u r p o s e s .

However, t h e

p r e f e r r e d

? e l d

. o f .

u s e .

of such arrangements a r e . e l e c t r i c a l

acoustical instruments in

which the middle

permanent

magnet i s

madeo f s t e e l

and i s

band

shaped

soas

t o be adapted

. t o o s c i l l a t e

. a n d s e r v e

as an

o s c i l l a t i o n

creating r e e d .

above i n

an

e l e c t r i c a l

piano

isshown i n F i g s .

v 5

a n d . 6 . - .

As

shown

i n t h e s e . ? g u r e s , . t h e

p i a n o i n

c l u d e s s e v e r a l p i a n o k e y s , i n d i c a t e d by t h e r e f e r

ence numeral 4 5 ;

each . o f

t h e s e piano keys i s

t u r n a b l y p i v o t e d

a t

4 6

t o

t h e

body o f

t h e

p i a n o ,

n o t

shownin t h e d r a w i n g .

F u r t h e r m o r e , v my n e w . piano

i n c l u d e s a

stop

member 4 ' a g a i n s t

which

t h e

piano

key

a b u t s , a s

c l e a r l y

shown

i n

F i g . 6 , i f i t s

o u t e r

o p e r a t i n g

end

p o r t i o n

4 8

i s

d e p r e s s e d by t h e person p l a y i n g . t h e

piano in direction of

arrow 4 9 . .

At t h e s u p p o r t i n g

end p o r t i o n 5 0 4 0 f

. k e y 4 5 , - I

mount

an

iron b l o c k

5i

c orres p o ndi n g

to

.

the

b l o c k 3 5

shown. i n F i g . 4 . . Inthisblock, I mount

t h e permanently magnetized band-reed 52

c o r

r e s p o n d i n g _ t o t h e middle

permanent

magnet

3 6 .

o f . F i g .

vLandon

o p p o s i t e

. s i d e s o f . t h e . . b . l o c k 5 | ,

I .mount

.thepermanent

magnetic members

5 3 ,

and

. 5 4 corresponding t o

t h e o u t e r permanent

magnets

53.and 34

of

Fig. l .

By t h i s arrangement, i t i s p o s s i b l e

t o

. c r e a t e a t

the . f r e e e n d ~ 5 5 o f reed . 52 a l o n g i t u d i n a l l y e X -

tended magnetic

?eld . 5 6 .

I t

i s e v i d e n t t h a t i f key 4 5 i s d e p r e s s e d i n

d i

r e c t i o n o f arrow

4 9

and abruptlyabuts a g a i n s t

t h e

. s t o p

member

4 1 , - t h e

r e e d

5 2 w i l l

b e f o r c e d t o

o s c i l l a t e i n d i r e c t i o n o f arrow 5 1 , a s i n d i c a t e d i n

F i g . 6 .

O f

c o u r s e ,

o s c i l l a t i o n o f

the

reed

w i l l a l s o

cause o s c i l l a t i o n o f the magnetic

?eld 5 5 .

In o rder to

a v oi d u n d e s i r e d

interferencebe

tween o s c i l l a t i o n o f the

. k e y

4 5 and reed

5 2

a f t e r

s t r i k i n g

t h e

k e y , I

p r o v i d e

a t

t h e f r o n t

end o f

t h e

key a screw 5 8 which

i s

adjustable

r e l a t i v e

t o

the

k e y ;

by

t u r n i n g . o f

t h i s - s c r e w ,

i t i s

p o s s i b l e

t o

a d j u s t

t h e

f r e q u e n c y .

1 ' o s c i l l a t i o n s

o f .

t h e key 4 5

An a p p l i c a t i o n o f t h e arrangements

d e s c r i b e d .


6/9

2 , 5 4 2 , 2 7 1

and

t h e r e b y a v o i d i n t e r f e r e n c e

o f

such o s c i l l a

t i o n s with

the

o s c i l l a t i o n s o f

reed

5 2 .

In order t o transform

the


the


extended magnetic ? e l d 5 6 i n t o

e l e c t r i c a l c u r r e n t v a r i a t i o n s w h i c h , i n t u r n , might

be transfo rmed i n t o

a u d i b l e

s i g n a l s , I

p r o v i d e

i n

accordance with my

present

i n v e n t i o n two par

a l l e l l y a r r a n g e d

s t a t i o n a r y

i n d u c t a n c e c o i l s 5 9

and 6 0 ,

forming between themselves

t h e s l o t

B l .

I wish

t o

s t r e s s

that

the s t o p member 4 ' has t o

be arranged

i n

such a

manner that

the

l o n g i t u d i

n a l l y extended

magnetic

?eld 5 6 e n t e r s t h e s l o t

6 whe n

t h e

key 4 5 i s i n

t h e

p o s i t i o n shown i n

F i g .

6

a f t e r s t r i k i n g o f

the same.

In t h i s

p o s i t i o n ,

t h e

magnetic

? e l d

5 5

o s c i l l a t e s

within

the s l o t

6 | ,

i . e . between the two induct

ance c o i l s

5 9 and 6 0 .

I wish

t o

note that

i n

accordance with my

p r e s e n t i n v e n t i o n t h e windings

G 4

and

6 5 o f

t h e

stationary inductance

c o i l s 5 9 and 6 0

are ar

ranged s o as to

create

in a common l e c t r i c a l c i r

c u i t o p p os i t e l y d i r e c t e d

e l e c t r i c a l

c u r r e n t . Thus,

i f

the

two c o i l s

a r e

a t

the

same moment

e q u a l l y

influenced

b y an outer e l e c t r i c a l source located

paced

from the two inductance c o i l s , the same

w i l l be

equally influenc ed

and the

e l e c t r i c a l

cur

r e n t s c r e a t e d

i n t h e

two c o i l s w i l l be e q u a l and

o p p os i t e l y d i r e c t e d

and t h u s

p r a c t i c a l l y c a n c e l

and

e l i m i n a t e

each

o t h e r .

In

t h i s manner,

i t i s

p o s s i b l e t o

avoid

any

outer

undesired e l e c t r i c

and

magnetic

i n f l u e n c e s upon

t h e

p i c k - u p

d e v i c e .

Contrary t h e r e t o ,

t h e o s c i l l a t i n g magnetic ? e l d

5 5

o s c i l l a t e s

between

the two

inductance c o i l s

5 9

and 6 6 and thereby d i f f e r e n t l y i n f l u e n c e s t h e

same a t the same moment.

Thus, the

e l e c t r i c a l

c u r r e n t s c r e a t e d by

t h e s e


t h e mag

n e t i c

?eld

5 5

do

not cancel

each other but a r e

combined s o a s t o c r e a t e a f t e r ampli?cation by

t h e

ampli?er 6 2 a u d i b l e s i g n a l s t r a n s m i t t e d by

the loud speaker 6 3 .

I wish t o s t r e s s

that

I have found that

i t

i s

p o s s i b l e

t o

simultaneously

pick up

a p l u r a l i t y

o f

o s c i l l a t i o n s

c r e a t e d by

a p l u r a l i t y o f piano keys

with

the same two

stationary

inductance c o i l s t o

c r e a t e i n

s a i d inductance

c o i l s

a p l u r a l i t y o f

i n

dependent

currents corresponding

each t o one o f

the

o s c i l l a t i o n s ,

and

t o

reproduce t h e s e c u r r e n t s

in such

a

manner

that the

audible s i g n a l s

corre

sponding

t o

each

o f

the

o s c i l l a t i o n s are independ

e n t

and c l e a r l y d i s t i n g u i s h a b l e

from each

o t h e r .

I t w i l l

be

understood

that

each

o f

the elements

described above, or t w o o r more t o g e t h e r ,

may

a l s o

?nd a u s e f u l a p p l i c a t i o n i n other types o f

a c o u s t i c a l

i n s t r u m e n t s ,

d i f f e r i n g

from t h e t y p e s

described

a b o v e .

While I

have i l l u s t r a t e d

and d e s c r i b e d

the

i n

vention a s embodied

i n

e l e c t r i c a l

p i a n o s ,

I do

not

intend t o be l i m i t e d t o

t h e

d e t a i l s

shown,

s i n c e

v a r i o u s

modi?cations and s t r u c t u r a l

changes

may

be

made without departing i n any w a y from the

s p i r i t o f

my

n v e n t i o n .

Without f u r t h e r a n a l y s i s ,

the

f o r e g o i n g w i l l s o

f u l l y r e v e a l

the g i s t o f my invention that o t h e r s

can

by

applying

c u r r e n t knowledge r e a d i l y

adapt

i t

f o r v a r i o u s a p p l i c a t i o n s without o m i t t i n g f e a ~

t u r e s

t h a t ,

from

t h e s t a n d p o i n t

o f p r i o r

a r t ,

f a i r l y

c o n s t i t u t e

e s s e n t i a l c h a r a c t e r i s t i c s o f t h e g e n e r i c

o r s p e c i ? c a s p e ct s o f

t h i s i n v e n t i o n ,

a n d , t h e r e

f o r e , such adaptations should and are intended

t o be comprehended

within

the

meaning

and

range o f equivalence o f the

f o l l o w i n g

c l a i m s .

What

I

claim

as new a nd

d e s i r e to

secure

b y

L e t t e r s Patent

i s :

1 . For use in

an

e l e c t r i c a l musical

instrument

1 0

1 5

20

25

30

i t )

45

60

65

7 5

a

d e v i c e

f o r

c r e a t i n g a v i b r a t i n g l o n g i t u d i n a l l y

e x t e n d e d

magnetic f i e l d c o m p r i s i n g

i n

combina

t i o n t h r e e l o n g i t u d i n a l permanent

m a g n e t i c

members, na mely

two

o u t e r

l o n g i t u d i n a l perma

nent

magnetic

members

and a

middle

l o n g i t u

d i n a l

permanent magnetic

v i b r a t a b l e

r e e d a r

ranged p a r a l l e l

and

spaced

from

each o t h e r

i n

such a manner that s a i d

middle

longitudinal

permanent m a g n e t i c v i b r a t a b l e r e e d

p r o j e c t s

beyond

the f r o n t end

p o r t i o n s

o f s a i d o u t e r l o n g i

t u d i n a l

permanent

magnetic

members.

2. For use in

an e l e c t r i c a l

musical

instrument

a d e v i c e f o r creating a vibrating


extended

magnetic

? e l d

comprising

i n

combina

t i o n t h r e e

l o n g i t u d i n a l permanent m a g n e t i c

members,

namely two

o u t e r

l o n g i t u d i n a l perma

nent

magnetic

members

and

a middle

l o n g i t u

d i n a l

permanent

magnetic

v i b r a t a b l e

reed a r

ranged p a r a l l e l and spaced from

each

o t h e r i n

such

a manner

that

s a i d

middle

longitudinal

permanent magnetic v i b r a t a b l e r e e d p r o j e c t s b e

yond t h e

f r o n t end

p o r t i o n s o f s a i d o u t e r

l o n g i

t u d i n a l

permanent

magnetic members;

and a

s l i g h t l y magnetic

member a r r a n g e d between

s a i d

o u t e r l o n g i t u d i n a l permanent

magnetic

members

in such a manner that said front end portions

o f s a i d

o u t e r l o n g i t u d i n a l permanent

magnetic

members

p r o j e c t

beyond

s a i d s l i g h t l y

m a g n e t i c

member.

3 .

For

use in an e l e c t r i c a l musical instrument

a

d e v i c e f or

creating

a

vibrating


extended

magnetic

? e l d

comprising

i n

combina~

t i o n t h r e e l o n g i t u d i n a l

permanent

m a g n e t i c

members, namely two o u t e r l o n g i t u d i n a l perma

nent magnetic members and a

middle

l o n g i t u

d i n a l permanent magnetic

v i b r a t a b l e

r e e d

a r

ranged

p a r a l l e l

and

spaced

from

each

o t h e r

i n

such a

manner

that

said

middle longitudinal

p e r

manent

magnetic

v i b r a t a b l e r e e d

p r o j e c t s

b e

yond

t h e

f r o n t

end

p o r t i o n s o f

s a i d o u t e r l o n g i

t u d i n a l permanent magnetic members;

and a


member

arranged

between

s a i d

o u t e r l o n g i t u d i n a l permanent magnetic members

contacting

the same and

s a i d middle

l o n g i t u

d i n a l permanent

magnetic


i n

such

a manner

that said

front

end

portions o f

s a i d o u t e r


permanent

m a g n e t i c

members p r o j e c t

beyond

s a i d s l i g h t l y magnetic

member.

4 . For

use in

an e l e c t r i c a l musical

instrument

a

device f o r creating

a

vibrating l o n g i t u d i n a l l y

extended magnetic

? e l d

comprising

i n

combina

t i o n t h r e e l o n g i t ud i n a l permanent m a g n e t i c

members, n amely

two

o u t e r l o n g i t u d i n a l s t r o n g

permanent

magnetic

members

and

a middle

l o n g i t u d i n a l weaker

permanent magnetic v i b r a t

a b l e r e e d arranged p a r a l l e l

and

spaced from

each other

in such a manner

that

said

middle


weaker permanent

m a g n e t i c

v i b r a t

a b l e

r e e d

p r o j e c t s

beyond t h e f r o n t

end

p o r t i o n s

o f s ai d o u t e r l o n g i t u d i n a l

s t r o n g permanent

magnetic members.

5 .

For

use in an e l e c t r i c a l musical

instrument

a

device f o r

creating a vibrating

longitudinally

extended

magnetic f i e l d comprising

i n

combina

t i o n

t h r e e

l o n g i t u d i n a l permanent

magnetic

members,

namely

two

o u t e r


s t r o n g

permanent

magnetic

members and

a

middle


weaker permanent magnetic v i b r a t

a b l e

reed\arranged

p a r a l l e l and spaced from

each other

in

such

a manner

that

said middle


permanent

magnetic v i b r a t

a b l e

reed p r o j e c t s

beyond

the

f r o n t

end

por

t i o n s o f

s a i d o u t e r


s t r o n g

perma

nent

magnetic

members;

and a



7/9

2 , 5 4 2 , 2 7 1

7

member arrangedbetween s a i d

o u t e r l o n g i t u d i

nal ; strong

permanent

magnetic,

members?inp;

such anianner

t h a t s a i d f r o n t e n d p o r t i o n s of

s a i d

o u t e r

l o n g i t u d i n a l s t r o n g p e r m a n e n t mag

n e t i c

members p r o j e c t

beyond

s a i d s l i g h t l y mag

n e t i c

member.

6 . For

use

i n

an

e l e c t r i c a l musical instrument

a

d e v i c e

f o r

c r e a t i n g

a

v i b r a t i n g


e x t e n d e d m a g n e t i c ? e l d c o m p r i s i n g i n c o m b i n a

t i o n

t h r e e l o n g i t u d i n a l permanent

magnetic

members, namely two o u t e r l o n g i t u d i n a l s t r o n g

permanent

magnetic

members

and a

middle

l o n g i t u d i n a l weaker permanent magnetic

v i b r a t

a b l e reed

arranged parallel

and

spaced

fr om

each

other inusuch a

manner

that

s a i d

middle


permanent magnetic

v i b r a t

a b l e r e e d p r o j e c t s

beyond

t h e

f r o n t end

por

t i o n s of s a i d o u t e r l o n g i t u d i n a l strong-permae

nent magnetic

members; and

a s l i g h t l y

magnetic

member arranged between s a i d

o u t e r l on g i t u d i

nal s t r o n g permanent magnetic

members

con

t a c t i n g

the same

and s a i d

middle l o n g i t u d i n a l

weaker

permanent

magnetic

v i b r a t a b l e r e e d i n ,

such a

manner that said

front end portions o f

s a i d o u t e r l o n g i t u d i n a l s t r o n g permanent

mag

n e t i c

members p r o j e c t beyond

s a i d

s l i g h t ma g

n e t i c

member.

7.

For

use in an

e l e c t r i c a l

piano a device

f o r ,

a

v i b r a t i n g

l o n g i t u d i n a l l y extended

r e a t i n g

magnetic, ?eld

comprising

i n combination a

t u r n a b l e

h o l d i n g a r m ; , a magnetized f r e e l y v i

bratable s t e e l

reed secured

t o one end o f s a i d

t u r n a b l e holding

arm;

two l o n g i t u d i n a l perma

nent magnetic

members

secured a l s o t o s a i d

holding arm

p a r a l l e l

t o and

spaced from

s a i d

magnetized

f r e e l y v i b r a t a b l e s t e e l

' r e e d

so that

s a i d magnetized f r e e l y v i b r a t a b l e s t e e l r e e d pro

j e c t s

beyond

t h e

f r o n t end p o r t i o n s

o f

s a i d l o n g i

t u d i n a l permanent

m a g n e t i c

members;

p i v o t i n g

means

turnably s u p p o r t i n D r s a i d turnable hold

ing arm; and

s t o p

means

arranged in

the path

o f turning o f

s a i d

t u r n a b l e holding arm.

8 .

For use

in

an e l e c t r i c a l piano

a device

f o r ;

c r e a t i n g a

v i b r a t i n g l o n g i t u d i n a l l y

extended

magnetic

?eld

comprising in

combination a

turnable holding

arm;

a

s l i g h t l y magnetic block

secured

t o one

end o f said turnable

holding

arm;

a

magnetized


s t e e l reed secured

t o s a i d s l i g h t l y magnetic b l o c k e x t e n d i n g i n d i

r e c t i o n o f s a i d h o l d i n g arm; two l o n g i t u d i n a l

permanent

magnetic

members s e c u r e d a l s o i t o

said


block

p a r a l l e l t o

a nd

s p a c e d

from s a i d m a g n e t i z e d f r e e l y

v i b r a t a b l e

s t e e l

reed

so

that said

magnetized

freely

vibrat:

l

a b l e , s t e e l r e e d ;

p r o j e c t s

beyo nd the f r o n t e n d

p o r t i o n s o f s a i d l o n g i t u d i n a l

permanent

magne

t i c members; p i v o t i n g means

t u r n a b l y s u p p o r t :

t i n g

s a i d

t u r n a b l e h o l d i n g n a r m ; andstop means

a r r a n g e d

i n t h e v p a t h v

o f

turningof s a i d

t u r n e

a b l e

holding arm;

9 . F o r use in an e l e c t r i c a l piano a

device

f o r

c r e a t i n g a v i b r a t i n g


extended mag

n e t i c ?eld comprising i n combination

a

turnable

holding

arm;

a

slightlymagnetic

b l o c k

secured

t o one

end

o f

said turnable

holding

arm;

a mag

n e t i z e d f r e e l y

v i b r a t a b l e

s t e e l reed

secured

t o

s a i d s l i g h t l y magnetic b l o c k

p r o j e c t i n g

a

sub

s t a n t i a l d i s t a n c e i n d i r e c t i o n of s a i d holding arm

b e y o n d

s a i d

s l i g h t l y

m a g n e t i c

b l o c k ;

t w o

l o n g i t u -

V 7 0

t o s a i d

s l i g h t l y m a g n e t i c b l o c k v

p a r a l l e l t o a n d ,

d i n a l

permanent magnetic members s e c u r e d a l s o

s p a c e d

from

s a i d magnetized f r e e l y

v i b r a t a b l e

s ' e e l

reed

projecting s l i g h t l y in

the

direction o f

s a i d h o l d i n g arm beyond s a i d s l i g h t l y magnetic

b l o c k ;

p i v o t i n g

m e a n s ;

t u r n a b l y . s u p p o r t i n g s a i d ,

15

20

2 5

30

35

40

45

50

55

60

65

75

8

t u r n a b l e

h o l d i n g a r m ; a n d s t o p n m e a n s a r r a n g e d ,

i n

the

path o f turning

o f

said turnable h o l d i n g

arm.

1 0 . For use i n an e l e c t r i c a l piano a d e v i c e f or

c r e a t i n g

a v i b r a t i n g l o n g i t u d i n a l l y

e x t e n d e d ,

magnetic v ? e l d

comprising

i n combination a ,

t u r n a b l e

holding arm; a magnetized f r e e l y v i b r a t

a b l e s t e e l

reed

secured

t o

one end

o f

s a i d

turn

a b l e h o l d i n g arm; two


permanent

magnetic m-mbers

secured

a l s o t o s a i d h o l d i n g

arm p a r a l l e l t o

and

spacedfrom

s a i d

magnetized


s t e e l

reed s o that s a i d mag

netized f r e e l y v i b r a t a b l e

s t e e l r e e d

p r o j e c t s

beyond

the

f r o n t

end

p o r t i o n s

o f

s a i d

l o n g i t u - v

d i n a l permanent

magnstic ,members;

p i v o t i n g

means t u r n a b l y s u p p o r t i n g s a i d t u r n a b l e h o l d i n g

arm;

s t o p means arranged

i n the

path o f ; turn

i n g

o f s a i d

t u r n a b l e

h o l d i n g arm;

and

a d j u s t i n g

means secured t o s a i d holding arm

f o r

v a r y i n g

t h e l e n g t h

o f

t h e same.

1 1 . For use

in

an e l e c t r i c a l piano

a

d e v i c e f o r

c r e a t i n g a _ v i b r a t i n g l o n g i t u d i n a l l y e x t e n d e d

magnetic

? e l d

comprising

i n

combination

a

t u r n

a b l e

h o l d i n g arm; a s l i g h t l y magnetic

b l o c k

secured t o one

end o f s a i d turnable holding

arm;

a

magnetized

f r e e l y v i b r a t a b l e s t e e l r e e d s e c u r e d

t o

s a i d slightlymagnetic b l o c k

e x t e n d i n g

i n

d i

r e c t i o n o f , s a i d holding arm;

two


permanent

magnetic members s e c u r e d , a l s o t o

s a i d s l i g h t l y magnetic b l o c k p a r a l l e l t o and spaced

from s a i d magnetized f r e e l y

v i b r a t a b l e

s t e e l r e e d

s o t h a t s a i d

magnetized f r e e l y

v i b r a t a b l e s t e e l

r e e d

projectsbeyond

t h e

f r o n t end p o r t i o n s o f

s a i d l o n g i t u d i n a l permanent

m a g n e t i c

members;

p i v o t i n g

means

t u r n a b ly s u p p o r t i n g

s a i d t u r n

a b l e n o l d i n g a r m ; s t o p means arranged i n

t h e

p a t h o f t u r n i n g o f s a i d t u r n a b l e h o l d i n g a r m ;

and an

a d j u s t i n g

member

mounted

o n

s a i d

turn

a b l e holding

arm

a t

one

end

t h e r e o f f o r varying

t h e ; l e n g t h of saidholding arm,

1 2 . For

use

in an e l e c t r i c a l piano a device

for

creating

;

a

vibrating longitudinally extended

magnetic f i e l d comprising i n

comb ination a

turn

able holding arm;

a


block

secured t o one endjof s a i d

turnable

holding arm;

a

magnetized f r e e l y v i b r a t a b l e s t e e l reed secured

t o s a i d s l i g h t l y magnetic

b l o c k

p r o j e c t i n g a sub

s t a n t i a l

d i s t a n c e i n d i r e c t i o n o f s a i d

holding

arm

b e y o n d s a i d s l i g h t l y m a g n e t i c b l o c k ; t w o l o n g i t u e

d i n a l permanent

magn-tic

members

secured

a l s o

t o s a i d s l i g h t l y magnetic

b l o c k

p a r a l l e l t o and

s p a c e d , from

s a i d

m a g n e t i z e d f r e e l y

v i b r a t a b l e

s t e e l

r e e d

p r o j e c t i n g

s l i g h t l y i n

t h e d i r e c t i o n o f

s a i d

h o l d i n g arm

beyond s a i d

s l i g h t l y

magnetic

b l o c k ;

p i v o t i n g means t u r n a b l y s u p p o r t i n g s a i d

t u r n a b l e h o l d i n g arm; s t o p

means

arranged

i n ;

t h e path o f

turningof

s a i d t u r n a b l e

h o l d i n g arm;

and

an a d j u s t i n g

s c r e w f r e e l y t u r n a b l y

s c r e w e d v

i n t o

thatend p o r t i o n

o f s a i d

h o l d i n g

arm t o

which s a i d s l i g h t l y magnetic

b l o c k

i s

s e c u r e d s o

a s t o enable varying o f the length o f s a i d hold

ing arm.

l 3 . -

In

an

e l e c t r i c a l piano in combination

an

e l e c t r i c a l v i b r a t i o n pick-up arrangJnent; a t u r n

able holding arm; a

magnetized

freely vibratable

s t e e l

reed

secured t o one end o f

said

turnable

h o l d i n g arm; two


permanent ma g

neticmmibers

secured

a l s o t o

s a i d

holding

arm

p a r a l l e l

t o

and

s p a c e d

from

s a i d m a g n e t i z e d

f r e e l y

v i b r a t a b l e s t e e l ? r e e d

s o

t h a t s a i d

mag

n e t i z e d f r e e l y v i b r a t a b l e

s t e e l

r e e d

p r o j e c t s

b e y o n d ;

t h e f r o n t

end p o r t i o n s o f s a i d l o n g i t u

d i n a l permanent

m a g n e t i c

members; p i v o t i n g

means

t u r n a b l y s u p p o r t i n g

s a i d

t u r n a b l e h o l d i n g

arm in l s u c h w a : m a n n e r t h a t

s a i d l m a g n e t i z e d


8/9

2 , 5 4 2 , 2 1 1

f r e e l y

v i b r a t a b l e

s t e e l

r e e d

s e c u r e d

t o s a i d turn

a b l e h o l d i n g arm

i s

adapted t o move i n

the

p i c k

up

s p h e r e o f

s a i d

e l e c t r i c a l v i b r a t i o n

pick-up

arrangement; and

s t o p means

arranged

i n t h e

path

o f

turning

o f

s a i d

turnable holding

arm

s o

a s t o

engage

the same when s a i d magnetized

f r e e l y v i b r a t a b l e s t e e l r e e d s e c u r e d t o s a i d turn

a b l e holding arm s l o c a t e d

near

s a i d e l e c t r i c a l

v i b r a t i o n

p i c k - u p

arrangement

i n t h e p i c k u p

sphere

o f

the same.

1 4 . In

an e l e c t r i c a l piano i n combination two

elongated s t a t i o n a r y

inductance

c o i l s forming a

s l o t

between

themselves and w o u n d

i n

such

a

manner as t o c r e a t e in

a

commonelectrical c i r

c u i t

o p p o s i t e l y

d i r e c t e d

e l e c t r i c a l c u r r e n t s ; a

t u r n a b l e h ol d i n g

member;

a magnetized f r e e l y

v i b r a t a b l e s t e e l reed secured

t o

one end o f s a i d

t u r n a b l e h o l d i n g arm; two l o n g i t u d i n a l p e r

manent magnetic members s e c u r e d a l s o t o s a i d

h o l d i n g

arm

p a r a l l e l t o

and

spaced

from

s a i d


v i b r a t a b l e

s t e e l reed s o

that

s a i d

magnetized


s t e e l r e e d p r o

j e c t s beyond t h e f r o n t end p o r t i o n s o f s a i d l o n

g i t u d i n a l

p e r m a n e n t m a g n e t i c m e m b e r s ;

p i v o t

i n g

means turnably

supporting s a i d t u r n a b l e

holding arm

in such a manner

that the same

i s

movable between i n o p e r a t i v e p o s i t i o n i n which

t h e l o n g i t u d i n a l l y

extended

magnetic ? e l d

c r e a t e d by

s a i d


v i b r a t a b l e

s t e e l

reed

i s not

p r o j e c t i n g i n t o s a i d s l o t between

s a i d

e l o n g a t e d

s t a t i o n a r y

inductance

c o i l s

and

v i b r a t i o n c r e a t i n g p o s i t i o n i n which s a i d l o n g i

t u d i n a l l y

extended

magnetic ? e l d

c r e a t e d by

s a i d

magnetized


s t e e l r e e d i s p r o

j e c t i n g i n t o

s a i d s l o t ' b e t w e e n s a i d e l o n g a t e d

s t a

tionary

inductance c o i l s ; and stop means a r

ranged i n

t h e

path o f t u r n i n g o f

s a i d

t u r n a b l e

holding arm

so as to engage

the

same

when

said

turnable holding arm i s i n vibration c r e a t i n g

p o s i t i o n i n

which s a i d

l o n g i t u d i n a l l y e x t e n d e d

magnetic

? e l d c r e a t e d by

s a i d magnetized

f r e e l y

v i b r a t a b l e s t e e l reed i s

p r o j e c t i n g

i n t o s a i d

s l o t

between s a i d e l o n g a t e d s t a t i o n a r y i n d u c t a n c e

c o i l s .

15(In

an e l e c t r i c a l piano i n combination two

elongated

s t a t i o n a r y inductance c o i l s forming

a

s l o t

between

themselves and

wound

i n such a

manner as to create

in a common l e c t r i c a l c i r

c u i t

o p p o s i t e l y

d i r e c t e d

e l e c t r i c a l

c u r r e n t s ; a

t u r n a b l e

h o l d i n g

member;

a

s l i g h t l y

magnetic

block

secured

t o one end o f s a i d

turnable hold

i n g arm; a magnetized

f r e e l y

v i b r a t a b l e

s t e e l

reed secured

t o

s a i d


b l o c k

pro

j e c t i n g

a

s u b s t a n t i a l d i s t a n c e i n d i r e c t i o n of

s a i d

h o l d i n g

arm beyond

s a i d

s l i g h t l y

magnetic b l o c k ;

two

l o n g i t u d i n a l permanent

m a g n e t i c

members

s e c u r e d a l s o

t o s a i d

s l i g h t l y magnetic b l o c k

p a r a l l e l t o

and

spaced

from

s a i d

magnetized


r e e d p r o j e c t i n g

s l i g h t l y i n

the

d i r e c t i o n o f

s a i d

holding arm beyond s a i d

s l i g h t l y

magnetic b l o c k ; p i v o t i n g means

t u r n a b l y

supporting s a i d t u r n a b l e holding arm

i n

such

a

manner

that

the same i s movable

between


p o s i t i on i n which

t h e


extended magnetic

? e l d c r e a t e d

by

s a i d

mag

n e t i z e d

f r e e l y

v i b r a t a b l e s t e e l reed

i s

not pro

j e c t i n g

i n t o

s a i d s l o t between s a i d e l o n g a t e d s t a

t i o n a r y

inductance

c o i l s and

v i b r a t i o n c r e a t i n g

p o s i t i o n i n which s a i d l on g i t u d i n a l l y e x t e n d e d

m a g n e t i c ? e l d c r e a t e d b y s a i d magnetized f r e e l y

v i b r a t a b l e

s t e e l r e e d i s

p r o j e c t i n g

i n t o s a i d s l o t

between s a i d

e l o n g a t e d

s t a t i o n a r y inductance

c o i l s ; and

s t o p

means

arranged

i n

t h e path

o f

turning o f

said

turnable holding

arm s o

as

t o

engage the same when

s a i d

turnable holding

1 0

1 5

20

25

30

3 5

40

45

50

5 5

60

6 5

7 0

7 5

1 0

arm i s


p o s i t i o n

i n

which

s a i d


m a g n e t i c

? e l d

c r e a t e d bysaid magnetized

f r e e l y

v i b r a t a b l e s t e e l

reed i s p r o j e c t i n g

i n t o s a i d

s l o t

between

s a i d

e l o n g a t e d

s t a t i o n a r y

i n d u c t a n c e

c o i l s .

1 6 .

In

an

e l e c t r i c a l piano i n combination tw o

e l o n g a t e d s t a t i o n a r y i n d u c t a n c e c o i l s

forming

a s l o t

between themselves

and

wound in such

a manner as

to

create in a common

electrical

c i r c u i t

o p p o s i t e l y

d i r e c t e d

e l e c t r i c a l

c u r r e n t s ;

a

turnable holding member;

a

s l i g h t l y

magnetic

b l o c k secured

t o one

end o f

s a i d turnable

hold~

i n g

arm; a magnetized


s t e e l

reed secured t o s a i d


b l o c k

pro

j e c t i n g

a s u b s t a n t i a l

d i s t a n c e

i n

d i r e c t i o n

o f

s a i d

h o l d i n g arm beyond

s a i d s l i g h t l y magnetic b l o c k ;

two l o n g i t u d i n a l permanent m a g n e t i c

members

secured

a l s o

t o s a i d s l i g h t l y magnetic b l o c k

p a r a l l e l t o

and

spaced

from

s a i d magnetized

f r e e l y v i b r a t a b l e s t e e l r e e d p r o j e c t i n g

s l i g h t l y

i n

the d i r e c t i o n o f s a i d

holding

arm beyond s a i d

s l i g h t l y magnetic b l o c k ;

an

a d j u s t i n g screw

f r e e l y

t u r n a b l y screwed i n t o t h a t end p o r t i o n o f

s a i d

holding arm t o which s a i d s l i g h t l y magnetic

block i s

secured

s o as t o

enable varying

o f

the

length o f s a i d holding

arm;

p i v o t i n g means

turn

a b l y

supporting

s a i d turnable holding

arm i n

such

a

manner that

the

same s movable

between


p o s i t i on i n which t h e l o n g i t u d i n a l l y

extended

magnetic

?eld

c r e a t e d by s a i d mag

n e t i z e d


reed i s not pro

j e c t i n g

i n t o s a i d

s l o t between

s a i d

e l o n g a t e d

s t a

t i o n a r y



c r e a t i n g

p o s i t i o n i n which s a i d l on g i t u d i n a l l y

e x t e n d e d

magnetic

? e l d c r e a t e d

by

s a i d magnetized f r e e l y

v i b r a t a b l e s t e e l r e e d i s

p r o j e c t i n g

i n t o

s a i d

s l o t

between s a i d e l o n g a t e d s t a t i o n a r y i n d u c t a n c e

c o i l s ;

and

s t o p means arranged i n t h e path o f

turning

of said

turnable holding arm

so

as

to

en

gage

the same when said turnable holding arm s


p o s i t i o n

i n which s a i d

l o n g i

t u d i n a l l y extended magnetic ? e l d c r e at e d by s a i d

magnetized


s t e e l r e e d i s p r o

j e c t i n g i n t o s a i d

s l o t

between s a i d

elongated s t a

t i o n a r y inductance c o i l s .

1 7 . In an e l e c t r i c a l piano

i n combination

tw o

e l o n g a t e d s t a t i o n a r y i n d u c t a n c e c o i l s

forming

a s l o t between

themselves

and wound i n such

a manner as to create in a

common

electrical

c i r c u i t e

o p p o s i t e l y d i r e c t e d

e l e c t r i c a l

c u r r e n t s ;

a turnableholding

member;

a magnetized f r e e l y

vibratable s t e e l reed secured

t o

one end

o f s a i d

turnable holding

member;

p i v o t i n g

means turn

a b l y s u p p o r t i n g

s a i d

t u r n a bl e h o l d i n g member

in such

a

manner that the

same

i s

movable b e

tween i n o p e r a t i v e

p o s i t i o n i n which t h e l o n g i

t u d i n a l l y

e x t e n d e d magnetic

? e l d

c r e a t e d

by

s a i d

magnetized f r e e l y v i b r a t a b l e s t e e l r e e d

i s

not

pro

j e c t i n g i n t o s a i d s l o t between s a i d e l o n g a t e d s t a ~

t i o n a r y



c r e a t i n g

p o s i t i o n

i n

which s a i d l o n g i t u d i n a l l y extended

magnetic

? e l d

c r e a t e d by s a i d

m a g n e t i z e d f r e e l y

v i b r a t a b l e

s t e e l r e e d i s

p r o j e c t i n g

i n t o s a i d s l o t

between

s a i d

e l o n g a t e d s t a t i o n a r y

inductance

c o i l s ; and

s t o p

means

arranged i n t h e

path o f

turning o f s a i d

turnable

holding

member

s o a s

t o engage

the same when s a i d turnable ho lding

member

s i n v i b r a t i o n

c r e a t i n g

p o s i t i o n i n which

s a i d


magnetic

? e l d

c r e a t e d

by

s a i d magnetized

f r e e l y


i s p r o j e c t i n g i n t o s a i d

s l o t

between s a i d e l o n g a t e d

s t a t i o n a r y inductance

c o i l s .

OCTAVIO JOSE ALVABEZ.

( R e f e r e n c e s o n

f o l l o w i n g

p a g e )


9/9

" 2 , 5 4 2 , 2 5 1

R E F E R E N C E S E I Q T E D

.The f o l l o w i n g r e f e r e n c e s a r e ' o f

" r e c ' u r d i n t h e

f i l e 6 1 t h i s

p a t g e n t z

Number

1 , 8 0 4 , 9 6 1

1 , 8 0 6 , 0 0 1

2 , 0 8 5 , 7 6 0

2 , 1 0 5 , 1 6 7

UNITED

STATES

PATENTS

5

Name Date

Thomas ________ _ May 12, 1 9 3 1

Simms

t a 1 .

________

May

1 9 , 1931

Loar ____________ _ July

' 6 , 1 9 3 7

Sinnett

e t

a 1 .

______

Jan. 1 1 ,

1938

10

Number

2 , 2 0 0 , 0 3 9

2 , 2 7 5 , 2 5 2

2 , 3 2 1 , 3 6 6

2 , 3 5 3 , 5 5 0

2 , 3 5 9 , 2 9 3

2 , 3 9 8 , 6 5 3

2 , 4 1 3 , 0 6 2

2 , 4 3 5 , 7 3 5

r 2 i

Name

, _ M

Date,

N i c o 1 l @ _ _ ~ _ . . _ _ . > . ; _ _ _ . . May 7 ,

1 9 4 0

Demuth ___ _ - _

Mar. , 3 , 1 9 4 2

Demuth ____ _ . _ _ _ _ June 8 , 1943

De Forest

e t a 1 . ____

July

1 1 , 1,9 44

Beechlyn

________

__ Oct. 3 ,

, 1 9 4 4

Linlor

__________

__

Apr. 1 6 ,

1 9 4 6

Miessner ________

__

Dec. 24 _1946

Briggs

__________

. . Feb. 10, 1 9 48

U.S. Patent 2,542,271, entitled "Device for creating oscillations" to Alverez, 1951.

Documents

Transcript of U.S. Patent 2,542,271, entitled "Device for creating oscillations" to Alverez, 1951.