military searchlight truck (1937)

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  • 8/22/2019 Military Searchlight Truck (1937)

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    2 , 1 9 4 , 8 3 5arch 2 6 , 1 9 4 0 . J . c . SAVAGEsmacnmenw

    Filed March 2 4 , 1 9 3 7 5 Sheets-Sheet 1

    F i g . 1 . 5|__________.~____________

  • 8/22/2019 Military Searchlight Truck (1937)

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    2 , 1 9 4 , 8 3 6a r c h 2 6 , 1 9 4 0 . J . c . SAVAGEsmncamem

    Filed M a r c h 2 4 , 1937 5S h e e t s - S h e e t 2

  • 8/22/2019 Military Searchlight Truck (1937)

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    2 , 1 9 4 , 8 3 6a r c h 2 6 , 1 9 4 0 . J . c . SAVAGESEARCHLIGHT

    F i l e d M a r c h 2 4 , 1937 5 Sheets-Sheet 5

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    March 2 6 , 1 9 4 0 . J , c . SAVAGE 2 , 1 9 4 , 8 3 6SEARCHLIGHT

    Filed larch 2 4 . 1937 5 Sheets-Sheet 4

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    M a r c h 2 6 , 1 9 4 0 . J _ c _ S A V A G E _ 2 , 1 9 4 , 8 3 6 vS E A R C H L I G H TFiled M a r c h 2 4 , 1937 5 Sheets-Sheet 5

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    P a t e n t e d M a r . 2 6 , 1 9 4 0

    UNITED STATES PATENT OFFICE

    2 , 1 9 4 , 8 3 6

    2 , 1 9 4 , 8 3 6SEAROHLIGHT _

    John C l i f f o r d S a v a g e , Hendon, London, EnglandA p p l i c a t i o n M a r c h 2 4 , 1 9 3 7 , S e r i a l N o . 1 3 2 , 8 3 7

    In G r e a t Britain March 6 , 1 9 3 64 Claims.

    Th e 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 s e a r c h l i g h t sand has f o r i t s c h i e f o b j e c t t o provide a n im pr ovedsearchlight so constructed as to enable a largea r e a t o be r a p i d l y a nd thoroughly scanned by t h e

    5 l i g h t b e a m without a p p r e c i a b l e r e d u c t i o n i n t h ei n t e n s i t y o f th e l i g h t per u n i t a r e a .

    Another o b j e c t o f th e p r e s e n t i n v e n t i o n i s t o prov i d e a s e a r c h l i g h t th e l i g h t beam from w hichis cap a b l e o f b e i n g s p r e a d o r d i v e r g e d l i n e a r l y inaplane

    1 0 a t r i g h t a n g l e s t o t h e o p t i c a l a x i s o f t h e p r o j e c t o rand a l s o o f b e i n g t r a v e r s e d c o n t i n u o u s l y , p r e f e r -a b l y t o v a r i a b l e e x t e n t s , i n a d i r e c t i o n p a r a l l e l t ot h e o p t i c a l a x i s o f t h e p r o j e c t o r .A t i l l f u r t h e r o b j e c t o f t h e p r e s e n t i n v e n t i o n

    1 5 i s t o p r o v i d e a s e a r c h l i g h t whose l i g h t b e a m i sc a p a b l e o f b e i n g c o n t i n u o u s l y t r a v e r se d and a u t om a t i c a l l y spread o r d i v e r g e d l i n e a r l y t o an e x t e n tdepending on th e extent o f th e t r a v e r s i n g mo v ement.

    2 0 Further o b j e c t s a nd advantages o f th e p r e s e n tinvention w i l l b ecome apparent from the a c c o mpanying d e t a i l e d d e s c r i p t i o n o f a preferred embodiment thereof with reference t o the a c c o mpanying drawings i n w h i c h :

    25 F i g . 1 i s a view i l l u s t r a t i v e o f the pur pose o f thep r e s e n t i n v e n t i o n ;F i g . 2 i s a v i e w i n s i d e e l e v a t i o n o f a m otor roadv e h i c l e equipped with a s e a r c h l i g h t a c c o r d i n g t o

    t h e p r e s en t i n v e n t i o n ;30 F i g . 3 i s a n e nd e l e v a t i o n of the m otor roadv e h i c l e shown i n F i g . 2 ;

    F i g . 4 i s a plan view o f the mirror mosaic o rassembly employed i n a s e a r c h l i g h t a c c o r d i n g t ot h e p r e s e n t i n v e n t i o n ;3 5 F i g . 5 i s a view i n s i d e e l e v a t i o n o f themirror mosaic o r assembly;

    F i g . 6 i s a c r o s s s e c t i o n a l v i e w o n the l i n e A--Bo f F i g . 5 ;F i g . 7 i s a v i e w i n s i d e e l e v a t i o n o f m e a n s f o r4 0 t r a v e r s i n g the mirror mosaic o r a s s e m b l y .S e a r c h l i g h t s a s u s u a l l y c o n s t r u c t e d p r o j e c t ,

    g e n e r a l l y s p e a k i n g , a p a r a l l e l o r s u b st a n t i a l l y p ara l l e l beam o f l i g h t , the c r o s s s e c t i o n a l area o fw h ic h a t any d i s t a n c e from th e p r o j e c t o r i s ap

    4 5 proximately c i r c u l a r a nd o f m o r e o r l e s s l i m i t e dd i m e n s i o n s : c o n s e q u e n t l y m u c h t i m e i s r e q u i r e dt o scan a g i v e n area w ith the beam a n d therei s c o n s i d e r a b l e l i k e l i h o o d o f th e o b j e c t w h i c h i ti s d e s i r e d t o ?nd a nd i l l u m i n a t e remaining unilluminated e v en i f i t maintains a p e r f e c t l ys t r a i g h t a nd l e v e l c o u r s e , a nd where, a s i n th ec a s e o f a i r c r a f t , th e o b j e c t i s c a p a b l e no t o n l y o fc o n s i d e r a b l e s p e e d b u t a l s o o f b e i n g manoeuvred

    5 5 i n t h r e e dimensions t o a v o i d t h e beam, t h e chances

    50

    ( 0 1 . 2 4 0 4 5 1 4 )o f ?nding and i l l u m i n a t i n g i t by m e a n s o f , as e a r c h l i g h t a l o n e a r e c o m p a r a t i v e l y small.The use in conjunct ion w i t h 'searchlights ofsound l o c a t i n g apparatus has i n c r e a s e d i n somemeasure t h e e f f e c t i v e n e s s o f s e a r c h l i g h t s i n ?nd- > 5i n g and i l l u m i n a t i n g f a s t moving o b j e c t s , sucha s h i g h s peed a i r c r a f t , but the d r a w b a c ks alreadymentioned o f known s e a r c h l i g h t s remain a s f o rmidable o b s t a c l e s t o th e c e r t a i n ?nding and i l l umination o f an o b j e c t p a s s i n g through t h e area 1 0w i t h i n the r a n g e of any g i v e n searchlight.Th e improved s e a r c h l i g h t a c c o r d i n g t o t h e p r e se nt invention i s constructed in s u c h a mannert h a t t h e l i g h t b e a m i s c a p a b l e o f , b e i n g spread o rdiverged l i n e a r l y , preferably t o variable extents 15and without s u b s t a n t i a l r e d u c t i o n o f l i g h t i n t e ns i t y per u n i t a r e a , i n a plane normal t o th e op' t i c a l a x i s o f th e p r o j e c t o r , that i s t o s a y , s o t h a ti t h as a n elongated r e c t a n g u l a r , instead o f as u b s t a n t i a l l y c i r c u l a r , form i n c r o s s s e c t i o n , a nd ' 2 0by t r a v e r s i n g such a s p r e a d o r d i v e r g e d l i g h tbeam b a c k w a r ds a n d for w a r ds a large are a c a nbe rapidly scanned.

    In F i g . 1 the c i r c u l a r area a represents an areao n a screen, s u c h as a cloud l a y e r , illuminated 25by a searchlight beam f c i r c u l a r c r o s s s e c t i o n a lf o r m , a nd t h e e l o n g a t e d rectangulararea 1 ) r e presents an a r e a i l l u m i n a t e d by t h e same beamw h e n spread o r d i v e r g e d l i n e a r l y according . t oth e present i n v e n t i o n . I t w i l l be apparent that 30b y , r o c k i n g o r t r a v e r s i n g t h e l i n e a r l y spread o rdiverged beam a n a r e a , such as represented a t0 , can be scanned v ery much m o r e rapidly t h a nthe s a m e area could be scanned b y the beam p roducing the m o r e limited illuminated area a . 35Th e extent o f th e l i n e a r spread o r divergenceo f t h e be am o f the s e a r c h l i g h t a c c o r d i n g t o t h ep r e s e n t i n v e n t i o n i s p r e f e r a b l y c a p a b l e o f b e i n gv a r i e d a s d e s i r e d and d and e r e p r e s e n t a r e a sw hi ch c o u l d be scanned by th e b e a m w h e n l i n - 4 0e a r l y spread o r d i v e r g e d t o a l e s s e r e x t e n t .As w i l l be appreciated th e maximum p e r - _m i s s i b l e l i n e a r spread o r divergence o f t h e b e a ms h o u l d b e s u c h t h a t s u ? i c i e n t i n t e n s i t y o f i l l u m inat ion i s a l w a y s available.A further f e a t u r e o f the present invention r e

    s i d e s i n c o n t i n u o u s l y looking o r t r a v e r s i n g t h eb e a m w h e n l i n e a r l y spread o r d i v e r g e d . Prefe r a b l y t h e d e g r e e o f l i n e a r s p r e a d o r d i v e r g e n c ei s a u t o m a t i c a l l y a d j u s t e d t o c o r r e s p o n d w i t h t h e 5 0e x t e n t o f t h e rocking o r t r a v e r s i n g movement,that i s t o ' s a y , a s the l i n e a r spread'or divergencei n c r e a s e s the e x t e n t o f th e t r a v e r s i n g m o v e m e n ti s aut omat ically increas ed and vice versa.

    Referring t o F i g s . 2 - 7 i n c l u s i v e o f the accom- 5 5

    45

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    2panying drawings, 1 i s a p r o j e c t o r comprising asource o f l i g h t 2 , s h o w n a s a n e l e c t r i c are l i g h t ,l o cate d at o r n e a r t h e f o cus of a curvedfor e xa m ple a parabolic-re?ector 3 , arranged t o p roj e c t a s u b s t a n t i a l l y p a r a l l e l l i g h t b e a m i n a h o r izontal direction o n t o a mir r or mosaic or a s s e mbl y l l supported on a frame 5 w h i c h occupies aninclined c r o s s s e c t i o n a l area o f th e beam a nd i smounted f o r p i v o t a l o r rocking mo v e m e nt abouta n a x i s 6 l y i n g i n a plane passing through thep r i n c i p a l a x i s o f the p r o j e c t o r I by m e a n s o ftrunnions i w h i c h cooperate with bearings 8 ons u p p o r t s 9 c a r r i e d a t o p p o s i t e s i d e s o f t h e c y l i nd r i c a l c a s i n g i l l . Th e c y l i n d r i c a l c a s i n g l 0 hasa n aperture i l through w h i c h th e b e a m re?ectedfrom the mirror mosaic 4 emerges. Th e casingI l l i s supported f o r r o t a t i o n about i t s l o n g i t ud i n a l a x i s u p o n end m em b e r s i 2 a nd I 3 havingr o l l e r s i t w h i c h eng a g e i n s u i t a b l e r u n w a y s [ 5o n the casing i t .The p r o j e c t o r l , c a s i n g I t a nd

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