Cloth Tow Target Sleeve (1952)

7/27/2019 Cloth Tow Target Sleeve (1952)

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2 , 6 7 8 , 2 1 4. B . BREWER, JRNONRIGID TOW TARGET

May 1 1 , 1 9 5 43 Sheets-Sheet 1i l e d J u l y 1 8 , 1 9 5 2

INVENTOR.W/QLTEE 5BREWER E.

yam/MW?


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May 1 1 , 1 9 5 4F i l e d J u l y 1 8 . 1 9 5 2

W. B . BREWER, JRNONRIGID TOW TARGET

2 , 6 7 8 , 2 ' 1 43 Sheets-Sheet 3

~ INVENTOR.WHLTEE - BEfWfE A E .1 . . /

HTTQENEX?


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- element.

P a t e n t e d M ay 1 , 1 9 5 4 2 , 6 7 8 , 2 1 4

UNITED STATES PATENT O F F I C E 2 , 6 7 8 , 2 1 4

NONRIGID TOW TARGETW a l t e r B . B r e w e r , J r . , E a s t A u r o r a , N . Y . , a s s i g n o rt o t h e United States of America a s representedby h e S e c r e t a r y o f t h e A i r F o r c e

A p p l i c a t i o n J u l y 1 8 , 1 9 5 2 , S e r ia l N o . 2 9 9 , 7 1 48 C l a i m s .1

This i n v e n t i o n r e l a t e s t o tow t a r g e t s f o r a e r i a lgunnery a n d p a r t i c u l a r l y t o tow t a r g e t s o f t h enonrigid type.Tow a r g e t s f o r a e r i a l gunnery are s u b j e c t t or a p i d d e t e r i o r a t i o n due t o t h e v i o l e n t o s c i l l a t i o n s

o f th e ? e x i b l e f a b r i c o r s i m i l a r m a t e r i a l s fromwhich t h e y a re made.To maintain these o s c i l l a t i o n s a t as low a valuea s p o s s i b l e i t i s current p r a c t i c e t o i n c o r p o r a t e ,i n t h e d e s i g n o f t h e tow t a r g e t s , a p p r o p r i a t eaerodynamic s t a b i l i z i n g elements near t h e t r a i li n g end f t h e t a r g e t thereby i n t r o d u c i n g a power

f u l f a c t o r toward suppression o r elimination o ft h e t r o u b l e s o m e o s c i l l a t i o n s .Th e invention has f o r a n o b j e c t th e p r o v i s i o no f m e a n s i n th e s t a b i l i z i n g elements whic h f a c i l it a t e t h e s t o r i n g an d packaging o f t h e t a r g e t a sw e l l a s a s s i s t i n g i n th e operation o f launchingthrough c o n t r o l o f t h e r a t e a t whic h t h e t a r g e ti s u n f u r l e d .

(Ether objects a n d a dv a ntages o f the inventionw i l l become apparent from t h e f o l l o w i n g des c r i p t i o n an d a c c ompa ny ing drawings i n w h i c hl i k e reference characters r e f e r t o l i k e p a r t s i nth e s e v e r a l ? g u r e s .

F i g . 1 i s a schematic vie w o f apparatus emb o d y i n g my n v e n t i o n s h o w n with th e tow c a b l er e e l e d i n a n d t h e t a r g e t f u r l e d .F i g . 2 i s a v iew s i m i l a r t o Fig.1 but with thetow c a b l e payed ou t a n d the t a r g e t p a r t l y u n

furled.F i g . 3 shows th e ? e x i b l e f a b r i c t a r g e t c om

p l e t e l y u n w o u n d a n d extended a s i t appears a f t e rth e o p e r a t i o n o f t h e d e v i c e .F i g . 4 s ho ws the outer or main torque tubeupon w h i c h th e ? e x i b l e f a b r i c t a r g e t i s r o l l e di n r e a d y i n g t h e d e v i c e f o r o p e r a t i o n .F i g . 5 shows a n i n t e r n a l l y threaded c y l i n d e r

whic h s constructed t o contain a hydraulic f l u i d ,there being m e a n s t o f o r c e s a i d ?uid from s a i dc y l i n d e r through a r e s t r i c t e d o u t l e t t o r e t a r du n f u r l i n g o f t h e t a r g e t .

F i g . 6 shows a s l o t t e d torque tube s l e e v e w h i c hi s adapted t o transmit r o t a t i o n from t h e t o r q u et u b e t o t h e i n t e r n a l l y threaded c y l i n d e r .F i g . 7 shows a n e x t e r n a l l y threaded p i s t o n a r

ranged t o remain o n r o t a t i v e w h i l e engaging thei n t e r n a l t h r e a d s o f t h e i n t e r n a l l y t h r e a d e d c y l i n ~d e r , whereby r o t a t i o n o f t h e s a i d c y l i n d e r e f f e c t sr e l a t i v e a x i a l mov e me n t o f the c y l i n d e r withr e s p e c t t o t h e p i s t o n .

F i g . 8 shows the drag element, w h i c h s e r v e sa l s o a s a container f o r the torque t u b e with thetarget wrapped a r o u n d i t . y

F i g . 9 i s a h o r i z o n t a l s e c t i o n through t h e drag

I O

20

25

3 0

35

50

55

( C l . 273-1053) 2F i g . 1 0 shows one o f the ? e x i b l e l o o p s with

w h i c h t h e f r o n t o f t h e t a r g e t i s p r o v i d e d .F i g . 1 1 shows one o f th e ? e x i b l e l o o p s withw h i c h t h e r e a r en d o f t h e t a r g e t i s p r o v i d e d .F i g . 1 2 i s a n assembly view o f the p a r t s w h i c happear s e p a r a t e l y i n F i g s . 4 , 5 , 6 a n d .L i k e r e f e r e n c e c h a r a c t e r s r e f e r t o l i k e p a r t sthroughout t h e s e v e r a l v i e w s .Th e drag element 2 9 , a s s h o w n i n F i g . 8 , c omp r i s e s a framework c o n s i s t i n g o f v e r t i c a l l y ext e n d i n g a n g l e s e c t i o n s 2 2 s u p p o r t e d by b u l k h e a d s

2 2 : 3 3 . On e o f the four c o r n e r s o f t h e drag element2 8 i s open i n th e form o f a s l o t 2 8 w h i c h extendss u b s t a n t i a l l y t h r o u g h o u t t h e e n t i r e l e n g t h o ft h e drag e l e m e n t . Guide t r i p s 2 8 with t h e l o w e rp o r t i o n o f V form a n d t h e upper p o r t i o n c i rc u l a r a r e spaced l o n g i t u d i n a l l y o f t h e drag e l em e n t with the bottom o f the V open a n d in regi s t e r with t h e s l o t 2 c o f t h e drag e l e m e n t . Atthe open bottom o f the V he corners are rounded.The dimensions o f t h e guide s t r i p s 2 8 should b esuch t h a t t h e t a r g e t w h e n c l o s e l y r o l l e d aroundth e t o r q u e tube i l l e n t e r through h e g u i d e s t r i p sq u i t e f r e e l y . Th e purpose o f t h i s c o n s t r u c t i o ni s important a s w i l l hereinafter appear.Th e t a r g e t , s e e F i g . 3 , c o n s i s t s o f a p i e c e o fw o v e n f a b r i c 3 i ] which, f o r purposes o f d e s c r i pt i o n , but not by w a y o f l i m i t a t i o n , may be about6 f e e t wide b y 3 0 f e e t l o n g . r I h e f r o n t en d o ft h e t a r g e t i s p r o v i d e d w i t h r e i n f o r c i n g l o o p s 3 2 ,F i g . 1 0 , t h e s e l o o p s b e i n g p r o v i d e d t o r e c e i v e t h espreader bar a t from w h i c h th e b r i d l e l i n e s a sextend a n d b y w h i c h they a r e held spaced a p a r t .The r i d l e l i n e s converge ( s e e F i g . 3 ) a n d meeti n a common point at 38 w h ere they are c onnected t o t h e t r a i l i n g end o f t h e conventionaltow cable 4 0 c a r r i e d on a r e e l on th e towing p l a n e .A weight 4 - 2 on th e bottom end o f th e spreaderb ar keeps t h e t a r g e t i n a v e r t i c a l p l a n e .At t h e t r a i l i n g end t h e t a r g e t G i r l i s p r o v i d e dw i t h r e i n f o r c i n g l o o p s t i l , F i g . 1 1 , t h e s e l o o p sb e i n g p r o v i d e d t o r e c e i v e a t o r q u e t u b e l i t , F i g . 4 - ,with t h e t a r g e t 3 0 wrapped c l o s e l y around i t .This t o r q u e tubaand-target assembly may e e n "t e r e d l o n g i t u d i n a l l y i n t o t h e drag element 2 % }within t h e space surrounded by the g u i d e s t r i p s2 8 , F i g . 9 . Th e reason f o r t h e shape o f t h e g u i d es t r i p s 2 8 w i l l n o w be a p p a r e n t , f o r w h e n t h et a r g e t i s r o l l e d around t h e m a i n t o r q u e tube a n di s i n p l a c e i n t h e drag element 5 3 within the u i d es t r i p s 2 8 , an d i s b e i n g p u l l e d through t h e s l o t2 6 t o u n r e e l i t , t h e t u b e - a n d - t a r g e t assembly b e a ra g a i n s t t h e V s i d e s 2 9 o f t h e g u i d e s t r i p s therebyo i f e r i n g c o n s i d e r a b l e r e s i s t a n c e t o being un w r a p p e d .The main t o r q u e t u b e 4 6 , b o t h i n s i d e and o u t


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with t h e main t o r q u e t u b e t i t .b l e d the torque tube s l e e v e 5 2 may neither r o

2 , 6 7 8 , 2 1 4a 3s i d e , i s o f u n i f o r m d i a m e t e r t h r o u g h o u t i t s l e n g t h .Within t h e m a i n t o r q u e t u b e , i n t e r m e d i a t e i t se n d s , t h e r e i s a h o l l o w i n t e r n a l l y threaded c y l i n

der 4 8 , F i g . 5 , c l o s e d a t one en d a n d open a t theo t h e r . An e x t e r n a l l y t h r e a d e d p i s t o n t s , F i g . ' 1 ,on the en d o f a tubular sh an k 5 2 , f i t s f r e e l y i n t othe i n t e r n a l threads o f the c y l i n d e r 4 1 . 3 . A eari n g collared near the o u t e r en d o f th e sh an k E 2m a i n t a i n s c o n c e n t r i c i t y between t h e sh ank 5 2a n d th e m a i n t o r q u e tube a t . A l o c k 5 6 a t theextreme upper en d o f on e o f th e v e r t i c a l angles e c t i o n s ' 2 2 o f the d r a g e l e m e n t f g c s u p p o r t s a rod5 % , the inner en d o f w h i c h extends i n t o - a s l o tt o t o p r e v e n t r o t a t i o n o f t h e shan k 5 2 with r espect t o the drag element 2 E 3 , wher eb y rotation -

' of the cylinder l i t r e l a t i v e to the piston movest h e c y l i n d e r a x i a l l y . A m a l l h o l e 5 5 i n t h e p i s t o n5 9 permits a h y d r a u l i c , f l u i d t o escape escapes l o w l y a n d t h e r e b y r e t a r d a x i a l movement o f t h ec y l i n d e r 4 8 a s i t i s screwed over the piston 5 8 .The t o r q u e tube s l e e v e F i g . 6 , i n t h e a s s e s sb l e d d e v i c e , l i e s between t h e m a i n t o r q u e tube4% a n d th e c y l i n d e r . 4 8 . Th e torque tube s l e e v e

6 2 i s s l o t t e d a s a t 6 1 3 , two s l o t s b e i n g 1 8 6 d e g r e e sa p a r t , a n d th e c y l i n d e r i i i ; has two p i n s d 8 c i r - 1 ~c u m f e r e n t i a l l y s p a c e d 1 8 0 d e g r e e s , a nd r e g i s t e ri n g with the s l o t s v M . Two o n g i t u d i n a l l y spacedr i v e t h o l e s 5 8 ' in the torque tube s l e e v e o r r e g i s t e rwith two e q u a l l y spaced h o l e s i n t h e m a i n t o r q u et u b e .tend through h o l e s 6 5 8 i n th e torque tube s l e e v ea n d the corresponding holes in the main torquetube 6 6 t o join these tubular members for un it a r y r o t a t i o n . R i v e t s " i t should be ?nished f l u s hwith both the o u t s i d e a n d th e i n s i d e o f th e tubea s s e m b l y . To f a c i l i t a t e e n t r y o f t h e p i n s b e i n t othe s l o t s e s , the open ends o f the s l o t s a r e f l a r e doutwardly a s a t i t .As ? n a l l y a s s e m b l e d , s e e F i g . 1 2 , t h e m a i nt o r q u e tube { i t with t h e t o r q u e tube s l e e v e 6 2

In the complete assembly, r i v e t s is ex- .

C R

4 7Next t h e p i n 5 8 i s w ithdrawn t o a l l o w t h ep i s t o n 5 8 w i t h i t s shank 5 2 , t o g e t h e r w i t h t h ec y l i n d e r 4 8 , t o be l i f t e d o u t o f t h e t o r q u e t u b et 6 , an d t h e c y l i n d e r 4 8 ? l l e d with a h y d r a u l i c

f l u i d t h e p i s t o n t o b e i n g screwed i n t o p l a c e , a n dt h e subassembly 4 8 - 5 2 r e t u r n e d t o i t s p o s i t i o ni n the m a i n torque tube 4 6 . As a n a l t e r n a t i v et h e p i s t o n 5 t with i t s shank 5 2 may e removedw i t h o u t w i t h d r a w i n g t h e c y l i n d e r 4 8 , t h e c y l i n

v v d ' e r i n t h a t c a s e b e i n g s e r v i c e d i n s i t u . The p i n, t h i s now returned to the position s h o w n .In th e schematic v i e w , F i g . 1 , a t o w p l a n e

i 2 i s equipped w i t h the conventional cable r e e l .it upon w h i c h the tow c a b l e # 5 3 i s s u b s t a n t i a l l yf u l l y r o l l e d , t h e t r a i l i n g en d o f the tow c a b l e

1 at b e i ng a t 3 8 . Bridle l i n e s 36 h a v e t h e i r leading

40now riveted therein i s slipped over the internal- .1 y t h r e a d e d c y l i n d e r a t w i t h t h e p i n s 6 6 i n t h es l o t s 6 d , t h e p i s t o n 5 b i s s t a r t e d i n t o t h e c y l i n d e r

. 4 8 , a n d the m a i n torque tube l l i i may b e r o t a t e d , thereby r o t a t i n g t h e s l e e v e 5 2 a n d th e c y l i n d e rE 8 , t h e p i s t o n 5 % ) remaining n o n r o t a t i v e becauseo f the p i n 5 8 . Th e b e a r i n g c o l l a r f i l d maintainsc o n c e n t r i c i t y o f t h e o u t e r en d o f t h e p i s t o n shankAs thus a s s e mtate nor move x i a l l y with reference t o th e maint o r q u e tube ' 5 6 ; t h e c y l i n d e r d 8 may move a x i a l l ybut may not r o t a t e with r e f e r e n c e t o the m a i nt o r q u e t u b e 4 6 ; an d t h e p i s t o n s t , i t s shank 5 2a n d bearing c o l l a r 5 6 % may not move a x i a l l y butmay r o t a t e with r e f e r e n c e t o t h e m a i n t o r q u etube 4 6 .In r e a d y i n g t h e d e v i c e f o r o p e r a t i o n , t h e main

a torque tube 55 w i t h the s l e e v e 62 inserted andf a s t e n e d by r i v e t s i 8 i s s l i p p e d through t h e l o o p sMen h e t r a i l i n g end o f t h e t a r g e t 3 % , then t h et a r g e t E l l i s r o l l e d around the outside o f th etube 4 6 . The tube 5 5 % with t h e t a r g e t r o l l edaround i t , i s then i n s e r t e d endwise i n t o th e drag

. e l e m e n t i d a n d' w i t h i n the b o u n d s o f the gui des t r i p s 2 8 , s e v e r a l i n c h e s o f t h e l e a d i n g end o ft h e t a r g e t b e i n g u n r o l l e d a n d passed endwisethrough th e s l o t 2 5 w h e n th e tube i t i s beingi n s e r t e d e n d w i s e i n t o t h e drag elementTh e spreader bar 3 % i s now attached t o th el e a d i n g end o f t h e t a r g e t , t h e b r i d l e l i n e s b e i n gp e r m a n e n t l y s e c u r e d t o t h e s p r e a d e r b a r b y l o o p s3 2 , F i g . 1 0 . From the spreader b a r / 3 d , the b r i d l el i n e s converge a n d a r e connected a t a s t o t h et r a i l i n g end o f t h e tow c a b l e A l l .

60

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ends j o i n e d a t 3 8 t o t h e t r a i l i n g en d o f t h e towcable 4 6 , a n d d i v e r g e a n d a r e j o i n e d i n s p a c e dr e l a t i o n t o t h e s p r e a d e r bar 3 4 . The l e a d i n g endo r the t a r g e t , 3 6 i s j o i n e d t o the s p r e a d e r bar3 4 by loops 3 2 . 'Within t h e drag element 2 : ) a n d w i t h i n t h ebounds of t h e g u i d e s t r i p ' 2 8 , t h e t a r g e t 3 0 i sf u l l y r o l l e d e x c e p t f o r s e v e r a l i n c h e s whi ch p r otrude a s a t 1 8 from the s l o t 2 3 o f the drage l e m e n t 2 % ] .The d e v i c e may o w be launched b y paying ou ttow c a b l e M } from the r e e l M , the hydraulic system i n t h e meant ime o p e r a t i n g a u t o m a t i c a l l y t oc o n t r o l th e u n f u r l i n g o f th e t a r g e t 3 8 .

F i g . 2 shows th e d e v i c e with th e tow c a b l eextended a n d t h e t a r g e t p a r t l y u n f u r l e d .Having d e s c r i b e d an embodiment of my nven-

t i o n , I c l a i m :1 . A o n r i g i d tow targetcomprising a r o t a t a b l er i g i d t o r q u e t u b e , a ? e x i b l e f a b r i c t a r g e t c l o s e l yr o l l e d over the o u t s i d e o f s a i d r i g i d torque t u b e ,a n d r e s i s t a n c e m e a n s including a cylinder c l o s e dat one en d a n d a d a s h pot piston therein withins a i d tube r e s p o n s i v e t o u n r o l l i n g o f s a i d t a r g e tfrom o f f the outside o f said tube t o m o v e a x i a l l yr e l a t i v e l y toward each o t h e r t o p r o v i d e r e s i s ta n c e t o r o t a t i o n o f s a i d tube t o retard unrollingo r" s a i d target. a2 . A tow t a r g e t comprising a n e l o n g a t e d drage l e m e n t , a t o r q u e tube p o s i t i o n e d l o n g i t u d i n a ll y i n s a i d ' d r a g element a n d r o t a t a b l e with r e f e r

e n c e t h e r e t o , a tow t a r g e t wrapped snugly arounds a i d t o r q u e t u b e a n d adaptedto be u n r o l l e d ' t or o t a t e s a i d t o r q u e t u b e , r o t a t i o n r e t a r d i n g meanswithin s a i d torque tube i n c l u d i n g a n i n t e r n a l l yt h r e a d e d . c y l i n d e r a n d a n e x t e r n a l l y threadedp i s t o n t h e r e i n r e s p o n s i v e t o r o t a t i o n o f s a i dtorquetube o move r e l a t i v e l y a x i a l l y toward eacho t h e r , anda e s i s t i n g me a n s within t h e c y l i n d e ro p p o s i n g s a i d a x i a l movement.3 . A tow t a r g e t comprising a drag element, at o r q u e t u b e p o s i t i o n e d v e r t i c a l l y i n s a i d drag e l ement a n d r o t a t a b l e t h e r e i n with r e f e r e n c e t h e r et o , a f l e x i b l e f a b r i c t a r g e t s e c u r e d t o s a i d t o r q u etube a n d c l o s e l y r o l l e d around s a i d t o r q u e tubewhereby u n r o l l i n g s a i d t a r g e t r o t a t e s s a i d t o r q u etube with r e f e r e n c e t o s a i d drag e l e m e n t , a n dr e s i s t i n g me a n s within s a i d t o r q u e tube movablea x i a l l y w i t h r e s p e c t t h e r e t o by u n r o l l i n g o f s a i dtarget t o rotate said torque tube.

, 4 . A tow t a r g e t comprising a drag element, aV torque tube positioned v e r t i c a l l y in said drag

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e l e m e n t a nd o t a t a b l e t h e r e i n w i t h r e s p e c t t h e r et o , a ? e x i b l e f a b r i c t a r g e t securedto s a i d torquet u b e v a n d c l o s e l y r o l l e d t h e r e a r o u n d , wherebyp u l l i n g on the outer en d o f s a i d f a b r i c t a r g e t t o

' u n r o l l s a i d t a r g e t r o t a t e s s a i d t o r q u e t u b e , as l e e v e within s a i d t o r q u e . tube constructed t o r ot a t e t h e r e w i t h , a c y l i n d e r within s a i d s l e e v e . Io


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2 , 6 7 8 , 2 1 45t a t a b l e t h e r e b y an d a x i a l l y movable t h e r e i n , ap i s t o n i n s a i d t o r q u e t u b e ?xed a g a i n s t r o t a t i o na n d a x i a l movement with r e f e r e n c e t o s a i d drage l e m e n t , a n d me a n s r e s p o n s i v e t o r o t a t i o n o fs a i d t o r q u e t u b e t o move s a i d c y l i n d e r a x i a l l ywith r e s p e c t t o s a i d p i s t o n .5 . A tow t a r g e t comprising a drag e l e m e n t , at o r q u e t u b e p o s i t i o n e d v e r t i c a l l y i n s a i d d r a gelement an d r o t a t a b l e t h e r e i n with r e s p e c tt h e r e t o , a ? e x i b l e f a b r i c t a r g e t s e c u r e d t o s a i dt o r q u e t u b e an d c l o s e l y r o l l e d t h e r e a r o u n d ,whereby p u l l i n g on th e o u t e r en d o f s a i d f a b r i ct a r g e t t o u n r o l l s a i d t a r g e t r o t a t e s s a i d t o r q u et u b e , a s l e e v e w i t h i n s a i d t o r q u e t u b e c o n s t r u ct e d t o r o t a t e t h e r e w i t h a n d ?xed a g a i n s t a x i a lmovement t h e r e i n , a n - i n t e r n a l l y t h r e a d e d c y l i nd e r w i t h i n s a i d s l e e v e a n d r o t a t a b l e thereby a n da x i a l l y movable t h e r e i n , a n e x t e r n a l l y t h r e a d e dp i s t o n w i t h i n s a i d i n t e r n a l l y t h r e a d e d c y l i n d e r?xed a g a i n s t r o t a t i o n a n d a x i a l mov e me n t withr e s p e c t t o s a i d drag e l e m e n t , a n d m e a n s t o r el e a s e s a i d p i s t o n t o permit r o t a t i o n t h e r e o f .6 . A tow t a r g e t comprising a n elongated h o ll o w d r a g e l e m e n t s l o t t e d t h r o u g h o u t i t s l e n g t h ,a t o r q u e t u b e o f s u b s t a n t i a l l y l e s s o u t s i d e diamet e r than t h e i n s i d e diameter o f s a i d drag e l ement p o s i t i o n e d l o n g i t u d i n a l l y i n s a i d d r a g e l em e n t , g u i d e s t r i p s c a r r i e d by s a i d d r a g e l e m e n to f s u b s t a n t i a l l y g r e a t e r i n s i d e d i a m e t e r thant h e o u t s i d e diameter o f s a i d t o r q u e t u b e an ds l o t t e d t o correspond t o s a i d drag e l e m e n t , a? e x i b l e f a b r i c t a r g e t having one en d secured t os a i d t o r q u e t u b e and c l o s e l y r o l l e d t h e r e a r o u n dand t h e o t h e r end e x t e n d e d o u t w a r d l y t h r o u g hth e s l o t s o f t h e drag element an d o f t h e g u i d es t r i p s whereby p u l l i n g on t h e e x t e n d i n g end o fs a i d t a r g e t r o t a t e s s a i d t o r q u e t u b e , a s l e e v ew i t h i n s a i d t o r q u e t u b e adapted t o r o t a t e t h e r ewith and ?xe d a g a i n s t a x i a l movement t h e r e i n ,a n i n t e r n a l l y threaded c y l i n d e r w i t h i n s a i d s l e e v er o t a t a b l e t h e r e b y an d a x i a l l y m o v a b l e t h e r e i n ,and a n e x t e r n a l l y t h r e a d e d p i s t o n t h r e a d a b l yr e c e i v e d i n s a i d i n t e r n a l l y t h r e a d e d c y l i n d e r and?xed a g a i n s t r o t a t i o n a n d a x i a l movement duri n g r o t a t i o n an d a x i a l movement o f s a i d c y l i nd e r d u r i n g r o t a t i o n o f s a i d t o r q u e t u b e b y unr o l l i n g o f s a i d ? e x i b l e f a b r i c t a r g e t from t h es a i d t o r q u e t u b e .

7 . A tow target comprising a n elongated hol-low drag element o f s q u a r e t r a n s v e r s e s e c t i o nw i t h on e c o r n e r s l o t t e d throughout i t s l e n g t h ,

20

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6guide s t r i p s o f V-shaped contour i n on e cornero f t h e drag element with t h e s i d e s o f t h e V l y i n ga l o n g t h e s i d e s o f t h e drag element an d t h e p o i n to f the v s l o t t e d a n d i n alignment with the s l o to f t h e drag e l e m e n t , a t o r q u e t u b e e x t e n d i n gl o n g i t u d i n a l l y w i t h i n t h e drag element a n d w i t hi n t h e con?nes o f t h e g u i d e s t r i p s , a ? e x i b l e f a br i c t a r g e t having on e en d s e c u r e d t o s a i d t o r q u etube a n d c l o s e l y r o l l e d therearound a n d h e o t h e rend e x t e n d e d o u t w a r d l y through t h e s a i d s l o t swhereby p u l l i n g on t h e extending end o f s a i dt a r g e t ? r s t p u l l s s a i d t a r g e t a g a i n s t t h e s i d e so f the \ I then r o t a t e s t h e s a i d t a r g e t a g a i n s tt h e f r i c t i o n a l r e s i s t a n c e between t h e r o l l e d t a rg e t an d t h e s i d e s o f t h e V , whereby t h e u n r o l l i n go f t h e t a r g e t i s r e t a r d e d .8 . A tow t a r g e t comprising an elongated h o llo w framework o f square t r a n s v e r s e s e c t i o n withon e c o r n e r s l o t t e d throughout i t s l e n g t h , g u i d es t r i p s o f V-shaped contour i n on e corner o f thedrag element w i t h t h e s i d e s o f t h e V l y i n g a l o n gt h e s i d e s o f t h e drag e l e m e n t , a n d t h e p o i n t o fth e V s l o t t e d a n d i n alignment with th e s l o t o ft h e d r a g e l e m e n t , a t o r q u e t u b e e x t e n d i n g l o ng i t u d i n a l l y w i t h i n t h e drag e l e m e n t an d w i t h i nth e con?nes o f th e g u i d e s t r i p s , a ? e x i b l e f a b r i ct a r g e t having one en d s e c u r e d t o s a i d t o r q u et u b e an d c l o s e l y r o l l e d t h e r e a r o u n d , an d t h eo t h e r end e x t e n d e d o u t w a r d l y through t h e s a i ds l o t s , whereby p u l l i n g on the extended en d o fs a i d t a r g e t ? r s t p u l l s s a i d t a r g e t a g a i n s t t h es i d e s o f t h e V , then r o t a t e s t h e s a i d t a r g e t a g a i n s tt h e f r i c t i o n a l r e s i s t a n c e between t h e r o l l e d t a rg e t a n d t h e s i d e s o f t h e V whereby t h e u n r o l l i n go f t h e t a r g e t i s r e t a r d e d , an d h y d r a u l i c l e a k a g em e a n s w i t h i n t h e t o r q u e t u b e o p e r a t i v e b y r ot a t i o n o f t h e t o r q u e t u b e t o c o n t r o l s a i d h y d r a u l i cl e a k a g e means t o f u r t h e r r e t a r d u n r o l l i n g o fs a i d t a r g e t .

R e f e r e n c e s C i t e d i n t h e ? l e o f t h i s p a t e n tUNITED STATES PATENTS

Number Name Date700,698 Mountford ______ _ May 20 , 1 9 0 2

1, 752, 0 10 Lamkey ________ _ Mar. 25, 1 9 3 01,794,828 Bleriot __________ _ Mar. 3 , 1 9 3 12,183,540 Campbell ________ __ De c. 1 9 , 1 9 392,523,738 Trimbach ______ _ Sept, 2 6 , 1950

2,538,719 Shee __________ _ Ja n. 1 6 , 1951

Cloth Tow Target Sleeve (1952)

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