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1 , 9 9 6 , 5 1 4p r i l 2 , 1 9 3 5 . F . R . HOUSE

NOISE REDUCING ‘MEANS FO R SOUND LOCATOR SEARCHLIGHT SYSTEMS

F i l e d J u ‘ n e 2 B , 1 9 3 4 2 S h e e t s - S h e e t 1

q1 .

INVENTOR

? q n / v k ’ , H0065

- T0 REMOTE GDNTROL

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A p r i l 2 , 1 9 3 5 . F . R . HOUSE 1 , 9 9 6 , 5 1 4

NOISE REDUCING MEANS FOR SOUND L O C A ' I ‘ O R SEARCHLIGHT SYSTEMS

F i l e d J u n e 2 8 , 1 9 3 4 Z v v S h e e t S - S h e e t 2

5manl l l l l l lmm

6 H I I J J I l l I I ‘ I F I I I I J l l l l l l l l l f ? :

7 5 / 7 4 . 4 - \H1 6 A T T Q R ' N E Y .

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P a t e n t e d ‘ A p r . 2 , 1 9 3 5

T E D S T A T E S

5 Claims.

‘ T h i s i n v e n t i o n r e l a t e s t o the problem o f l o

: c ‘ a t i n g “ a i r c r a f t at n ig ht b y means o f sound, so

i t h a t ‘ a n t i j a i r c r a f t s e a r c h l i g h t s and b a t t e r i e s m a ybe t r a i n e d u p o n t h e ‘ s a m e . Th e present p r a c t i c e

i s " t o e m p l oy a p l u r a l i t y of portable u n i t s com-

" p r i s i n g a s o u nd l o c a t o r , a s e a r c h l i g h t , a n d as e a r c h l i g h t t r u c k , t h e , l a t t e r n o t o n l y t r a n s p o r t

“ i i n g the s e a r c h l i g h t a nd o s s i b l y hauling t h e . sound

- 2 0

25

30

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~ l 0 c a t o r a s a t r a i l e r ’ , but a l s o s u p p l y i n g current

l 0 v f o r o p e r a t i o n ofth e re mo t e c o n t r o l a nd i n d i c a

t o r systems between the sound l o c a t o r a nds e a r c h l i g h t , a nd f o r t h e o p e r a t i o n o f t h e s e a r c hl i g h t i t s e l f . As o u t l i n e d i n t h e p r i o r p a t e n t t o

M. L . P a t t e r s o n , N o . 1 , 6 2 2 , 3 9 2 , d a t e d March 2 9 ,

1 9 2 7 , t h e t r u c k e n g i n e i s p r e f e r a b l y a l s o e m p l o y e df o r d r i v i n g ; t h e e l e c t r i c g e n e r a t o r f o r g e n e r a t i n gc u r r e n t f o r the above n a m e d p u r p o s e s , a c l u t c h

b e i n g - e m p l o y e d f o r c o u p l i n g and u n c o u p l i n g t h egenerator from the crank s h a f t .

Th e problem o f l o c a t i n g a i r c r a f t a t n i g h t , h o we v e r , i s b e c o m i n g m o r e a n d more i f f i c u l t a s t h e

airplanes are being s i l e n c e d by t h e us e o f r e

duced s p e e d p r o p e l l e r s , e n g i n e m u f ? i n g , e t c . , s o

that i t b eco m e s very important t o reduce a l l

s o un d s n e a r t h e s ou n d locator t o a m i n i m u m .Th e p r e s e n t i n v e n t i o n i s d e s i g n e d t o r e d u c e t h en o i s e from t h e t r u c k e n g i n e a nd g e n e r a t o r . v Extre m e s i l e n c e i s e s p e c i a l l y " d e s i r a b l e during thes o - c a l l e d t r a c k i n g p e r i o d . Th e ? r s t warning o f

‘ t h e approach o f a i r c r a f t i s u s u a l l y t e l e p h o n e d i n

from l i s t e n i n g o u t p o s t s s e v e r a l m i l e s away. Th es o u nd l o c a t o r is t h e n manned a nd t h e p o w e r

plan t s t ar t ed i n readiness fo r the expected a t t a c k ,a t which t i m e c u r r e n t i s r e q u i r e d f o r o p e r a t i n g

t h e remote c o n t r o l a nd data e l e c t r i c c i r c u i t s , a ndi t i s during t h i s p e r i o d t h a t t h e l e a s t l p o s s i b l e '

‘ noise i s d e s i r e d . The s e archlig ht i s n o t t ur n e d

40

45

50

on u n t i l t h e a i r c r a f t i s approximately l o c a t e d , so

t h a t a f t e r t h e Searchlight is o n , s i l e n c e i s not so

e s s e n t i a l , because a i r c r a f t may h e n be picked upby t h e e y e , or a t l e a s t t h e a i r c r a f t i s t h e n ' c l o s e r

a nd t h e n o i s e e m i t t e d g r e a t e r . Accordingto my

invention, I therefore propose t o provide a n a u

t o m a t i c s p e e d c o n t r o l o f t h e e n g i n e t o maintaint h e s p e e d v e r y l o w / d u r i n g t h e t r a c k i n g p e r i o d , ’

a nd t o o n l y speed i t up t o f u l l speed w h e n the

I s e a r c h l i g h t i s turned o n , r e q u i r i n g h e avy c u r r e n t .

A s a further means o t h e s a m e e nd I may r ovide a n extra m u ? l e r w h i c h may e e u t ’ i n during

the t r a c k i n g p e r i o d and which s e l i m i n a t e d w h e nthe t ruck i s on th e road o r , i f d e s i r e d , w h e n t hesearchlight s i n o p e r a t i o n .

R e f e r r i n g t o t h e d r a w i n g s showing one formmy nvention may s s u m e ,

l

P A T E N T o F F i c ENOISE REDUCING MEANS FOR SOUNDLOCATOR-SEARCHLIGHT SYSTEMS

Frank R. House, B a l d w i n Harbor, N. Y . , a s s i g n o rt o Sperry Gyroscope Com p any, I n c . , Brooklyn,N. Y . , a corporat ion of New York

A p p l i c a t i o n June 2 8 , 1 9 3 4 , S e r i a l N o . 7 3 2 , 8 6 0

(or 240-1) ,

F i g . 1 i s a d i ag ra m m a t ic view o f t h e search

l i g h t t r u c k a nd g e n e r a t i n g s e t .

F i g . 2 i s a di a gr a m m a t i c v i e w o f th e engine gov-ernor thereof.

F i g . 3 is a s i d e e l e v a t i o n o f the r e g u l a t o r a nda u x i l i a r y mu?ler employed, w i t h t h e cut-out

means t h e r e b e t we en.F i g . 4 s h o ws a diagram o f the complete sound

K l o c a t o r - s e a r c h l i g h t system n us e . '

" ' F i g . 5 i s a front elevation o f » t h e ‘sound locator

taken», at right angles to F i g . 4 . "

5

.As s e t up on h e ?eld, t h e ‘system compr i s e s a

‘ s o u n d . l o c a t o r I , a t which t h e l i s t e n e r s a r e l oc a t e d , a ' s e a r c h l i g h t 2 a nd a l g e n e r a t i n g t r u c k o r

' u n i t 3 , each s p a c e d ' f r o m t h e o t h e r s e v e r a l h undred f e e t . Th e s oun d l o c a t o r p r e f e r a b l y a l s o . i s

p r o v i d e d w i t h b i n o c u l a r s ?t o f o l l o w t h e t a r g e t

a f t e r being i c k e d up by t h e sound o c a t i n g h o r n s .Th e p o s i t i o n o f t h e s e a l r c h l i g h t i s \ c o n t r o l l e d a ut o m a t i c a l l y o r v semi-automatically from the

s ou n d locator b y a r e m o t e e l e c t r i c control sys-

t e m w i t h azimuth a n d g e l e v a t i o n t r a n s m i t t e r s a t

1 5

t h e sound l o c a t o r a c t u a t i n g a z i m u t h and e l e v a - ~t i o n m o t o r s or i n d i c a t o r s 5 a nd 8 at t h e search

g l i g h t . Th e e l e c t r i c power f o r o p e r a t i n g s a i d s y s

tem s s u p p l i e d f r o m ' t h e t r u c k u n i t 8 both b e f o r e

a nd a f t e r the s e a r c h l i g h t i s turned o n . Th es e a r c h l i g h t t r u c k i s s h o w n a s p r o v i d e d with ag e n e r a t o r o p e r a t i n g h a n d l e I l l , p i v o t e d a t 2 i ,which s erv e s t o t h r o w i n and out t h e clutch H

coupling the q u i l l shaft l 2 o f t h e generator

through t h e forward d r i v e s h a f t l3 o f . t h e t r u c ka nd a t t he s a m e t i m e uncoupling s a i d forward

d r i v e s h a f t from t h e r e a r p o r t i o n 1 3 ' thereof . »

S a i d handle i 0 may a l s o o p e r a t e t o cu t i n an

a u x i l i a r y m u i i l e r _ l 5 so a s t o l e s s e n the n o i s e w h e nt h e e n g i n e i s o p e r a t i n g t h e g e n e r a t o r 3 ' . Th emanifold p i p e I 6 i s s h o wn a s e n t e r i n g t h e ' r e g

u l a r m u i i l e r H, t h e mu?ier d i s c h a r g i n g normally

through c u t - o u t o p e n i n g s I 8 i n t h e e x h a u s t p i p e

l 9 . There i s s h o w n a s l e e v e 2 0 s l i d a b l y m o u n t e don s a i d p i p e s o as t o c l o s e s a i d opening i t w h e nthe s l e e v e i s m o v e d t o the r i g h t i n F i g . 3 , - s o t h a ta n a u x i l i a r y m u f f l e r l 5 connected t h e r e t o may

be t h r o w n i n by t h i s m e a n s . .For t h i s purpose“the operating l e v e r I 0 may be provided with a

downwardly e x t e n d i n g f o r k 2 2 , p i n n e d t o ' s l e e v e

2 0 s o that when a i d l e v e r I 0 i s m o v e d t o t h r o w

i n t h e g e n e r a t o r , t h e a u x i l i a r y m u ? l e r ' I 5 i s a u t om a t i c a l l y thrown i n , a nd w h e n t h e g e n e r a t o r i sthrown out, i t i s ' l i k e w i s e cu t out.

vThe'engine i s s h o w n a s p r o v l d e ' d ' w i t h a s p e e d

governor 2 3 f o r l i m it i n g t h e spe ed o f t h e e n g i n e .

I n p r i o r c o n s t r u c t i o n s ‘ t h e g o v e r n o r was s et s oa s t o permit a s u ? i c i e n t speed a t a l l times t o \

25

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10

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2 _

p r o d u c e t h e h e a v y c u r r e n t r e q u ir e d f o r t h e s e a r c hli g h t . A c c o r d i n g t o my n v e n t i o n , h o w e v e r , I pro

v i d e a ‘means f o r maintaining a reduced speeda nd c o n s e q u e n t l y a l ow n o i s e l e v e l w h e n o n l y

s m a l l ? c u r r e n t i s r e q u i r e d f o r o p e r a t i n g t h e r e

m o t e " c o n t r o l , but provide arr/ automatic meansf o r r a i s in g t h e s p e e d t o f u l l p o w e r w h e n h e . a m ti s s t a r t e d ; T h e . g e n e r a t o r i s a l s o p r e f e r a b l y s ocompounded t h a t a c o n s t a n t v o l t a g e i s m a i n - .

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

Fo r t h e s e purposes t h e r e i s s h o w n a s o l e n o i d ar

m a t u r e 2 4 d i f f e r e n t i a l l y c o n n e c t e d t o ‘ t h e e n g i n egovernor 2 3 s o t h a t ' t h e t h r o t t l e o r butter?y v a l v e

2 3 i n e engine i n t a k e i t a s s u m e s a d i f f e r e n t

p o s i t i o n under t h e t wo c o n d i t i o n s . Th e v a l v e "i s r e p r e s e n t e d a s p i v o t ed a t 31 d i s rotated byt he r o t a t i o n o f the a r m r ‘ l e v e r 8 wh ich i s p i v

o t e d a t 2 9 t o a l e v e r o r l i n k 3 0 . At i t s ‘ l o w e r

e nd s a i d l i n k i s shown‘ a s connected through arod 3 | ‘ t o ‘ a c o r e 2 4 o f the s o l e n o i d 3 2 . At i t so t h e r end s a i d l i n k 3 0 i s shown o n n e c t e d t h r o u g ha rod 3 3 t o a b e l l crank l e v e r 3 4 , the p o s i t i o n o f .

which s controlled b y t h e ; go ve rnor 23 . ‘ A t op

screw 4 3 o r i t s e q u i v a l e n t is f o r t h e purpose o f ‘p r e v e n t i n g t h e e n g i n e s p e e d from f a l l i n g below a

d e s i r e d m in i m u m, which m a y e l i t t l e more t h a n

v The ensitivity of t h e g o v e r n o r may e d i u s t e d

by m e an s o f b e l l crank l e v e r 3 5 , c o n n e c t e d bys p r i n g 3 6 t o l e v e r 3 4 , a nd t h e o u t e r e nd o f whichm a y b e a d j u s t e d t o v a r i o u s l o c k i n g p o s i t i o n s .

When nl y a s m a l l a m o u n t of current i s passing

t h r o u g h t h e s o l e n o i d 3 2 , t h e c o r e . 2 4 will remaini n t h e p o s i t i o n s hown i n F i g . ‘ 2 by r e a s o n o f t h e

p u l l o f t h e t e n s i o n s p r i n g 3 1 . when, h o w e v e r .t he s e a r c h l i g h t c i r c u i t i s c l o s e d by l o s i n g the

m a i n switch 8 , the increased current to s o l e n o i d3 2 will p u l l t h e c o r e . t o t h e r i g h t a g a i n s t t h e

s t o p 3 9 , t h u s r o t a t i n g t h e l e v e r 2 3 c l ‘ o c k w i s e j i n

50

~ e r a l r e s u l t s o u t l i n e d , a nd

F i g . 2 , a s s u m i n g , t h e governor t o r e m a i n s t a t i o n

a r y f o r t h e moment, a nd t h u s i n c r e a s i n g t h e e ng i n e s p e e d u n t i l t h e g o v e r n o r m o v e s l e v e r I ; t o

‘ the r i g h t s u ? l c i e n t l y t o prevent f u r t h e r , i n c r e a s e .

In my n v e n t i o n , t h e r e f o r e , t h e n o i s e o f t h e ge ne r a t i n g s e t i s g r e a t l y r e d u c e d d u r i n g t h e c r i t i c a ls e a r c h i n g o p e r a t i on by m a i n t a i n i n g a m i n i m u me n g i n e s p e e d a t t h a t t i m e a nd b y ‘ throwing i n

the extra mumer. ‘ a - _

/ \ In accordance with t h e - p r o v i s i o n s of the pat

~ e n t s t a t u t e s , I have h e r e i n d e s c r i b e d t h e ‘ p r i nc i p ' l e - a n d o p e r a t i o n o f my n v e n t i o n , . t o g e t h e r

with he apparatus which n o w c o n s i d e r t o r e p r e' s ent t h e b e s t e m b o d i m e n t thereof, b ut I desire

t o ’ h a v e i t u n d e r s t o o d t h a t the p p a r a t u s s h o w n‘ i s o n l y i l l u s t r a t i v e a nd t h a t t h e i n v e n t i o n ca nbe c a r r i e d o u t by_other means. A l s o , w h i l e i ti s d e s i g n e d t o u s e t h e v a r i o u s f e a t u r e s and ele

m e n t s i n t h e c o m b i n a t i o n a n d ‘ r e l a t i o n s d es c r i b e d , som e o f t h e s e m a y be a l t e r e d a nd o t h e r so m i t t e d w i t h o u t i n t e r f e r i n w i t h t h e m or e g e n - ]

e i n v e n t i o n e x t e n d sto'such se‘. , _ - ‘

- Ha vi ng described my n v e n t i o n , w h a t I claim

- . a n d d e s i r e t o secureby L e t t e r s Patent s : _ . '

1,996,614

. 1 . a sound l o c a t o r - s e a r c h l i g h t system f o r

n o c t u r n a l a n t i - a i r c r a f t u s e , t h e c o m b i n a t i o n witha s o u n d l o c a t o r , s e a r c h l i g h t and e n g i n e / d r i v e ngenerates, an l e c t r i c r e m o t e control sy s t e m be - '

tween t h e l o c a t o r a nd s e a r c h l i g h t ‘ , s a i d g e n e r a t o r

s u p p l y i n g c u r r e n t f o r b o t h s a i d s y s t e m and t h es e a r c h l i g h t , a s p e e d g o v e r n o r f o r maintaining as l o w e n g i n e s p e e d b e f o r e t h e s e a r c h l i g h t i s t u r n e d

on t o maintain a l ow s o i md le v el , a nd a u t o m a t i cm e a n s r e s p o n s i v e t o t h e i n c r e a s ed c u r r e n t r eq u i r e d by t h e t - f o r a l t e r i n g t h e g o ve r n o r r e g u l a t i o n t o r a i s e t h e speed t o f u l l p o w e r .

2 . In a.sound l o c a t o r - s e a r c h l i g h t s y s t e m f o r

n o c t u r n a l a n t i - a i r c r a f t u s e , t h e combination w i t h ‘

a s o u n d ‘ l o c a t o r , s e a r c h l i g h t y a n d e n g i n e d r i v e ng e n e r a t o r , a n e l e c t r i c r e m o t e c o n t r o l s y s t e m b et w e e n t h e l o c a t o r a nd h e s e a r c h l i g h t , s a i d g e n e ra t o r s u p p l y i n g c u r r e n t f o r b o t h s a i d s y s t e m andthe s e a r c h l i g h t , a dual speed range governor f o r

s a i d e n g i n e , a nd automatic m e a n s f o r s h i f t i n g

f r o m - t h e h i g h e r ‘ t o ‘ t h el o w e r ‘

r a n g e w h e n t h eheavy s e a r c h l i g h t c u r r e n t i s n o t b e i n g drawnf r o m said generator, t o reduce engine o i s e .

3 . In a ‘sound locator-searchlight s y s t e m f o r

n o c t u r n a l a n t i - a i r c r a f t u s e , t h e c o m b i n a t i o n w i t ha sound l o c a t o r , s e a r c h l i g h t a nd s e a r c h l i g h t ge ne r a t o r t r u c k , a n e l e c t r i c remote c o n t r o l s y s t e mb e t w e e n t h e l o c a t o r and s e a r c h l i g h t , s a i d g e n e ra t o r s u p p l y i n g c u r r e n t f o r both saidsystem andt h e ‘ s e a r c h l i g h t , m e an s f o r minimizing t h e n o i s e

o f s a i d t r u c k e n g i n e c o m p r i s i n g a - s p e e d g o v e r n o rf o r m a i n t a i n i n g a s l o w e n g i n e s p e e d b e f o r e t h e ]

searchlight i s t u r n e d on, a u t o m a t i c means re-

s p o n s i v e t o t h e i n c r e a s e d c u r r e n t r e q u i r e d by t h es e a r c h l i g h t f o r a l t e r i n g t h e g o v e r n o r r e g u l a t i o n

t o r a i s e t h e s p e e d t o f u l l p o w e r , an a u x i l i a r y

m u ? i e r , and means f o r t h r o w i n g s a i d m u m e r i nwhen a id generator i s o p e r a t i n g .

4 . In a sound l o c a t o r - s e a r c h l i g h t s y s t e m f o r

n o c t u r n a l a n t i - a i r c r a f t u s e , the combination w i t ha sound l o c a t o r , s e a r c h l i g h t and e n g i n e d r i v e n8 e n e r a t o r , a n e l e c t r i c r e m o t e c o n t r o l s y s t e m b etween t h e l o c a t o r a nd s e a r c h l i g h t , s a i d g e n e r a t o rs u p p l y i n g c u r r e n t f o r both s a i d s y s t e m a nd

e n g i n e , a u t o m a t i c m e a n s f o r s h i f t i n g from t h e

l 0 ,

1 5

3 5 .

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s e a r c h l i g h t , adual s p e e d r a n g e g o v e r n o r f o r s a i d ~ 4 5 ‘

higher t o the lower range w h e n t he h e a v y e a r c h - I v

l i g h t c u r r e n t i s n o t b e i n g dra wn from s a i d ge n

e r a t o r , t o r e d u c e n o i s e , a n a u x i l i a r y m u i i i e r , a ndm e a n s f o r a l s o throwing i n t h e s a m e t o f u r t h e r

reduce the enginenoise. I I

5 . ‘ I n a sound l o c a t o r - s e a r c h l i g h t s y s t e m f o r( n o c t u r n a l a n t i - a i r c r a f t u s e , t h e c o m b i n a t i o n w i t ha sound l o c a t o r , ' s e a r c h l i g h t a nd e n g i n e d r i v e ng e n e r a t o r , a n e l e c t r i c remote c o n t r o l system b etween t h e l o c a t o r a nd s e a r c h l i g h t , s a i d g e n e r a t o r

P 5 0

s u p p l y i n g c u r r e n t f o r both s a i d s y s t e m . a nd t h e '

s e a r c h l i g h t , a s p e e d c o n t r o l f o r m a i n t a i n i n g as l o w en g i n e s p e e d b e f o r e t h e s e a r c h l i g h t i s t u r n e d

on o maintain a l o w sound e v e l , a nd a u t o m a t i c .

means r e s p o n s i v e t o t h e i n c r e a s e d c u r r e n t r e ' - ‘q u i r e d b y t h e s e a r c h l i g h t , : t o r t o