US2928190A - Electric target-practice apparatus with time delay fixing means - Google Patents

Description

AL. w. EVANS ELECTRIC TARGET-PRACTICE AP March 15, 196,0 2,928,190

PARATUS WITH v TIME DELAY FIXING MEANS 2 Sheets-Sheet 1 Filed April 22. 1959 /NVEA/ TOR A T raR/vf Y;

March 15, 1960 l.. w. EVANS 2,928,190

ELECTRIC TARGET-PRACTICE APPARATUS WITH TIME DELAY FIXTNG MEANS 2 Sheets-Sheet 2 Filed April 22, 1959 l United States Patflfl() n ELECTRIC TARGET-PRACTICE APPARATUS WITH y TIME DELAY F IXING MEANS The present invention relates generally 'to electric target practice apparatus, and more particularly, to light projecting insert means and'an adjustable time delay dummy cartridge for actuating said means, both the insert means and cartridge being adapted for readyinsertion into a gun to render same usable for harmless simulated re for ,practice purposes. Various means for converting firearms for simulated re are well known wherein a ray of light, simulating the projectile, is projected from the barrel of the gun to the target in response to the squeezing of the trigger. Such means are immensely valuableto the sportsman inasmuch as they facilitate safe indoor practice at any time without the expenditure of costly actual ammunition.. 'In the interest of providing the user. with simulated practice lire approaching live tiring conditions, timing mechanisms have been employed in the practice device n to provide substantially the same or proportionate lapseof time between the shot and the reception of the light beam at an object as the time required for the passage of a real discharge of shot to the desired object.

Inasmuch as the target distance aswell as the explosive charge in certain live cartridges may vary considerably, depending upon individual situations and experience, the time required for a discharge of shot to reach the target may correspondinglyV Vary over a considerable range under actual firing conditions. A fixed delay in the timing mechanism of a practice device cannot simulate with precise accuracy such a wide range of lapsed times existing in actual firing conditions.

It is, therefore, an object of the present invention t provide electric target practice apparatus having an easily adjustable delay mechanism. y l

Another object of thepresent inventionis the provision of variable time delayed light projecting `means which may be readily incorporated into existing re arms vwhereby upon operation of thevtrigger of the re arm,

a delayed beam of light will be projected through the barrelof the gun and by virtue of the variable delay strike the target at precisely the same instant shot would hit if the gunhad been actually red. l

Yet another object of the. invention is to provide a simulated fire'device for firearms which is capable of precisely simulating a wide variety .of actual firing ccmditions.

A further object of .the present invention is the provision of an incapsulated adjustable delay timing mechanism simulating a cartridge and associated light projecting insert means for ready insertion into a shot gun to adapt'samerfor simulated target practice.

The invention possesses other objectsk and features of advantage, some of which, with the foregoing, will be set forth in' the"1`ollowing"description ofthe Vpreferred from of the invention which is illustrated inthe drawing accompanyingand forming part of the specication. It is to be understood, however, thatV variations in the showing made by the said drawing and 'descriptionmay be adopted within the scope of the invention as set forth 2,928,190 Patented Mar. 15, 1960 Figure 1 is a side elevational section View of a shot gun illustrating the electric target practice apparatus of the present invention in operable position therein.

Figure 2 is an enlarged broken-out elevational section view illustrating particularly the adjustable delay actuating cartridge of the target practice apparatusas inserted in the chamber of the gun and with the actuating lever in cocked position.

tFig. 3 isa broken-out actuating cartridge of Figure 2.

Figure ,4,is a sectional view taken along the line 4-4 of Figure 3 and illustrating particularly the escapement mechanism of the actuating cartridge.

Figure 5 is a sectional view taken along the line 5 5 of Figure 4. Y

Figure 6 is a sectional view taken along the line 6-6 of Figure 4. f

Figure 7 isa view similar to Figure 2 but with the actuating lever in actuated position.

Considering now the invention in some detail and referring to the illustrated form thereof in the drawing, particularly Figure l, there is provided Va conventional breachv loading shot Agun 10 in the barrel and chamber of whichv are respectively mounted light projecting insert means 11 and an adjustable delay actuating cartridge 12 in accordance with the present invention. The light projecting'insert means 11 is adapted to project a beam of light from the barrel of the shot gun 10 upon actuation by the actuating cartridge 12.A The cartridge 12 is adapted to be triggered upon receiving the tiring pin 13 of gun 10 which is actuated by the release of hammer 14- in response tothe application of pressure to trigger 16y in the conventional manner. In order that the light beamy strike a target at the same instant as a load of actual shot tired from the gun 10, the actuation of the light projecting insert means 11 is adjustably delayed relative to the pressing of the trigger 16 by a readily adjustable time delay mechanism contained in the cartridge 12. which is subsequently described in detail.

As regards the light projecting insert means 11, it is to be noted that same preferably includes an elongatedV .the conventionally tapered barrel 19 of shot gun 10 through the chamber 21 thereof subsequent to breaking of the 'gun at'the breach 22. The housing 17 in mounted position extends from a point proximate the chamber 21, out the muzzle of the barrel 19 with the housing projecting therefrom by an amount equal to the length of slots 18.

Within. the housing 17 at an intermediate region thereof isprovided a conventional flashlight bulb 23 or an equivalent electric source of light. The bulb 23 is mounted as by means of 'a retaining ring 24 which is radially tapped to receive a set screw, not shown, which extends Valso radially'through the wall of the housing 17 in thread- :able engagement therewith. Set screw 26 hence secures retaining ring 24 transversely within the housing and releasably secures the base of bulb 23 in xed coaxial position within such retaining ring. The bulb may thus be readily released for replacement by looseningnthe set screw. Y Y

Disposed forwardly of the light bulb 23 within housing y1'7 there is provided a cylindrical plug 27 retained within the housing as by means o f a forced lit and having a bottom plan section view of the leading end of housing 1.7. A second lens 34 is mounted transversely with the leading end of tube 33 as by means of ring 36 concentrically secured about the end of the tube by a forced fit and a retaining ring 37 threadably secured within the forward portions kof ring 36 and bearing against the lens. rLight emanatingfrom the bulb 23 is hence "collimated through the orifice 29 'ofplug 27vand focused by lenses 32, 34 into an intense beam projected axially from the tube 33.

ln order to provide electric current for lighting thebul 23, a plurality of dry cell batteries 38 are provided within the housing 17 in axially aligned contacting relation, The central terminal of the forward one of batteries 3S is urged into .contacting engagement with the central terminal of light bulb 2 3 by means of springloadedplunger Contact 39 bearing axially against the base f ace ofthe rearward one of such batteries More particularly, plunger Contact 39 is disposed in coaxial sliding relation .within a cylindrical axial recess 4 1. (see Figure 3) in the leading face of a cylindrical lelectrically conductive bridge member 42. A'compression spring 43 is disposed within the recess 41 and is secured to contact 39 to render same spring loaded. 4

Bridge member 42 is mounted coaxially within housing 17 by means of an annular insulating member 44 disvf posed between the outer periphery of the member and inner wall of the housing. The bridge memberis maintained in rigid position within the insulating member as by means of a set screw 46 and in axial disposal relative 'to the rearward one of batteries 38 such that the spring loaded plunger contact 39 is somewhat depressed to establish good electrical contact between all of the batteries, the light bulb 23; and the bridge member 4 2. The rear face of bridge member 42 is similarly provided with a cylindrical axial recess 47 within which is disposed a compression spring 48 secured to an axially slidable plunger Contact 49. The plunger contact 49 is thus spring loaded and such contact facilitates electrical connection of the battery and light bulb circuit of the light projecting insert means 11 to the actuating cartridge 12.

Considering now preferred structure of the actuating cartridge l2, same advantageously includes a cylindrical casing 51 having a flanged end face 52 at one end thereof and closely resembling a conventional shotgun ishell casing in appearance. The casing 51 is of a diameter enabling it to be easily inserted into the chamber 21 of gun it? through the breech thereof in the same manner as an actual shell. The end face52 is provided with a central axially extending threaded bore 53. An externally threaded cylindrical cup member 54 is provided with its open end threadably engaged within the inner end of bore 53 and its closed end projecting axially into the interior of casing i as best shown in Figure 2. lCup mem- 4ber S4 serves to mount an axially elongated plunger contact 56 which slidably extends through a central bore in the closed end of member 54. The contact 56 includes an intermediate collar portion which slidably engages the inner walls of the cup member and a compression spring 57 is disposed within the cup with opposite portions contacting the closed end of same and the collar portion of the contact 56. An externally threaded retaining ring 58 is threadably engaged within the kopen end of the cup member 54 and functions as a stop to the collar of the contact 56 while permitting a pin portion 59 thereof to extend through the ring in slidable engagement therewith. Pin portion 59 terminates substantially ush with the flanged end face 52 of casing 51 in receiving relation to firing pin 13 of gun 1i) upon the user pressing the trigger in. Hence, upon the release of the firing pin (see 'Figure 7)',jinto engagement with the pin portion .'59 of contact 56, such contact is urged vforward against the restraining force of Aspring 57 and out of the closed end of cup member 54.

Secured within the open end of casing 51 and projecting axially forward thereof into close proximity with contact 49 of "light -projecting ninsert Ymeans '11 there is provided an insulating mounting block 61. A pair of transversely spaced parallel mounting plates 62, 63 are secured to the block 61 extend therefrom within casing 51 to a point proximate the cup member 54. An actuating release bracket 64 is disposed in slidable relation adjacent the outer s ide of one of the mounting plates 62 and is provided withv an inwardly turned lug 66 at one end which extends through an axial guide slot 67 in plate 62. The other end of Vrelease bracket 64 is inwardly turned as shown generally at 68 for rigid attachment to the end of contact 56. A pin stop 69 is provided projecting transversely from the plate 62 to limit the forward travel of release bracket 64 in response to depression of the contact 56 upon release of firing pin 13. For purposes of delaying the projection of light from insert means 11 for a period of time substantially equal to the time required for the passage of a real discharge of shot toa desired spot, jcar'tridgie 12 includes v anadjust- `able delay timing mechanism which Afunctions 'to accom'- p'lish the foregoing in fa manner subsequently described in response to the forward travel of release bracket More specifically, the timing mechanism preferably includes a coil main spring 71 of conventional Vtype includinga winding shaft 72 andgear wheel 73 aflixed thereto. Main spring 71 issecured between plates 62, 63 and shaft 72 extends through a bore in plate 62 as best shown in Figure 5 to a point proximate the interior wall of casing 51. The end of shaft 7a2 is squared for engagement with a key or crank 74 as depicted in phantom in Figure 3 and an opening '76 is provided in the casing wall to facilitate laccess Yto the shaft. The spring 71 may hence be wound prior to insertion of cartridge 12 into the chamber of the gun byftulrning shaft 72 with crank 74. The spring shaft72 is lreleasably retained wound position by anescapement 77 coupled by a gear train .78 to the spring gear wheel ,73. The escapement 77 is mounted between plates 62, v'63 adjacent the guide slot 67 of plate 62 while the individual gears of gear train 78 are mounted between Vthe plates intermediate the escapement and spring 71. The escapement v77 preferably comprises an escapement wheel 79 the shaft of which is geared to the gear train and a detent 81 rotatably mounted with portions overlapping guide Vslot and engaging the teeth of the escapement wheel. Thelug 66 of actuating release bracket 64 engages thedetent 8 1 to prevent rotation of same when the bracket is in the unactuated position as best shown in Figure 4. With lug 66 engaging the detent 81,V the detent in turn locks the escapernent wheel 79 and hence the gear train 78 to prevent the stored energy inthe wound spring 71 from being dissipated in same. Upon the forward travel of the release bracket 64, however, in response to depression of contact 56 by release of the firing pin 13 of gun 1l) (see Figure 7), the detent 81 is unlocked and rotates out of engagement with the. escapement wheel 79. The gear train 78 is thereby released and spring 71 unwinds with an attendant rotation of spring shaft 72.

Inasmuch as the explosive charge of a shell may vary relative to Various types of shells and the distance to a target may vary over a considerable range, the time required for discharged Vshot tov reach the target in Aturn may vary considerably depending upon particular circumstances as hereinbefore mentioned. It is therefore highly advantageous that the compensating time 'delay produced by the timing mechanism of electric re simulating apparatus be adjustable such that the apparatus may simulate with extreme accuracy the actual firing of the gun under the varied conditions. I The present inven- `tion thereforeutilize's to great advantage the time requiredfor the spring shaft 72 to rotate between adjustable limits` pf rotationV to produce 'an adjustable delay whereby the foregoing advantage is realized. Morespeciff ically, a substantially elbow-shaped contact lever 82 is secured tofspiing shaft 72 and disposed outwardlyadjacent mounting plate 63. The lever 82 textends for:

. preadjusting the axial wardly of the spring shaft to`a point in close proximity to insulating mounting block landwhen the spring 71 is in wound retained positionas locked by'escapement 77, the forearm of the lever is substantially flush with the bottom longitudinal edge of mounting plate 63 as shown in Figure 2. Upon release of the spring in re-V sponse to forward movement of release bracket 64 in the manner hereinbefore described, however, the lever 82 is rotated upwardly. The upward rotation of the lever is stopped at adjustable limits of rotation in accordance with the salient features of the present invention by means of a longitudinally translatable contact plate 83 lsecured to the insulating mounting block 61V as shown in-Figure 7.' Plate 83 includes an upwardly inclined portion 84 at one end for receiving the rotating lever 82 and the opposite end is provided with an inwardly turned lug 86 for contacting engagement with the contact 49 of light projecting insert means 11. To render the contact plate 83 translatable in its securance to insulating block 61, a pair of axial slots 87, 88 `are provided in the plate and screws 89, 91 are inserted therethrough into threadable engagement with tapped holes provided in the block. Electrical contact between the Contact plate 83 and mounting plate 63 is prevented as by means of an in'- sulating sheet 92 disposed therebetween. `The lug 86 of contact plate 83 is urged against the contact 49 by means of a compression spring 93 disposed within a bore 94 in the front face of insulating mounting block 61 and bearing against the lug. By loosening the adjustment screws 89, 91 the contact plate 83 may hence be longitudinally translated against contact 49 and spring 93 to a range of positions within the extremes of slots 87, 88 to correspondingly vary the rotational position at which inclined portion 84 stops the contact lever 82. To facili'- tate ready access to the screws 89, 91, a slot 96 is provided in the wall of casing 64. Inasmuch as contact plate 83 and bridge member 42 of insert means 11 are insulated from the metallic portionsof gun 10, it will be appreciated that a closed circuit to light bulbf23 is only obtained upon contacting engagement between actuating lever 84 and Contact plate 83. The light bulb 23 is accordingly energized only after a time delay relative to the pressing of the trigger 16 Aof gun 10 which is adjustably determined by the time of rotation of actuating lever 82 into engagement with the contact plate 3 as disposed in a particular position of adjustable transation.

v Considering now the operation of the invention physically described hereinbefore,th e light'projecting insert means 11 is first provided with the bulb 23 and batteries 38. The housing 17 is then inserted into the barrel 19 of the conventional shotgun 10 through the charnber 21 thereof with the breech 22 open. Telescoping tube 33 including lenses 32, 37 is inserted into housing 17 from the muzzle end thereof. With the light projecting insert means 11 thus assembled and placed in operable position within the shot gun 10. anelectrical series circuit is formed which comprises the gun barrel 18, housing 17, light bulb23, batteries 38, and conducting bridge member 42. To complete the circuit and provide a closed current path through the bulb 23 to light same it will be appreciated that the bridge member 42 must be conductively coupled lto the housing 17.A

v from in response to actuation,

The actuating cartridge 12 is now adjusted for a predetermined time delay to compensate for the difference in the time required for light to travel from the gun .10 to a given target and the time required for a discharge of actual shot to reach the same target by appropriately position of contact plate 83. The key 74 is inserted through fthe opening 76 in cartridge casing 51 into engagementl with spring shaft 72 and the shaft is manually turned thereby a fraction of a `turn counter-clockwise to wind the main spring '71. The

vspring is retained in wound or cocked position by the escapement 77 through gear train 78- and the `actuating ductivelyengages the contact 49`of the insert means bridge member 42. Thehammer 14.*of the gun 10 is then cocked and the user is ready to engage in safe simulated practice firing of the Vgun .under conditions whichr approach actual firing conditionswith'extreme precision from` the standpoint of elapsed time between the pulling of the triggeran'd the moment the shot reaches the desired object. Upon-squeezing trigger 16, the hammer 14 falls and urges the firing pin 13 forward. Suchforward motion .of thepindepresses the plunger contact 56 of cartridge 12 and maintains the depressedY condition until the breech 21 of gun 10 is broken. Actuating releasev .bracket 64 is' responsively urged forward as depicted in Figure 7 and the lug 66 thereof is disengaged from detent 81 of escapeinent 77.v Escapernent wheel 79 is hence released to in turn4 release gear train `78 and allow main spring 71 to unwind. Actuating rcontact lever 82 is thereby rotated clockwise and after a finite vtime of rotation contacts contact plate 83 in its preadmeans to the target. Byvirtue of the preadjusted time lcl'elay between the time lthe trigger 16 was squeezedA and the time the bulb 23 was energized, `the light beam visibly strikes the targetat substantially the same instant as would have an'actual discharge of shot.

To prepare the simulated re apparatus of the present invention for the next shot', the breech 22 of gun 10 is broken and cartridge'lZ is ejected from the chamber 21 by ejector means (not shown) conventionally included in lsuch guns. Cartridge 12 is removed andy mainspring 71 is again wound as hereinbefore described. The cartridge 12 is now'ready forloading into gun 10 and firing of another simulated shot unless the distance to the target is altered. 1n this event the contact plate 83 is first appropriately adjusted `to produce a time delay corresponding to the new targetdistance. The present inventionby virtue ofthe-adjustable delay feature hence facilitates simulated re at targets at varied distances with substantially the same time allowance for the beam of light that the shot inactual shooting requires.

' Wnat is claimed is:r

1. Practice fire simulating apparatus for a gun comprising light projecting insert means removably tted within the barrel of the gun for projecting light thereand an adjustable delay actuating cartridge removably fittedV within the chamber of the' gun for actuatingsaid insert means, vsaid cartridge including "a spring driven gear train, `rel'easable lock means engaging said gear train to prevent rotation same in response tothe firingl pin of `the gun striking the cartridge, and contact levermeans rotatably ,connected to said gear train-and actuating said insert means subsequent to rotation between adjustable limits. 1

2. In combination with a gun, means vfor producing a beam of light removably fitted Awithin the barrel of the gun, said means having an electrical actuating Contact; andV an adjustable delay--actuating cartridge removably fitted within the chamber' of the gun to close a light energizing circuit to said `contact in response to squeezing of the trigger of the gun, said cartridge comprising-.a casing with a closure face at one end, a depressible contact extending through said closure lfaceto receive the -iing pin ofthe gun, a spring driven'gear train mounted within said casing, an escapement geared to sai'd train, lock means engaging said escapement 'and operatively connected to said depressible contact for vreleasing the Vescapement in response to depression of the contact, conldi'ict'or means insulatedly mounted within said casing and extending from the open end thereof into contact with said electrical actuating contact Vof the 4insert means, a contact lever rotatably driven by said gear train and engaging said conductor means a`t a limit of angular rotation to 'close said light energizing Circuit, and adjustment means for varying said limit of Irotation whereby the time lrequired for -said lever to rotate into engagement with the conductor means is adjustable.

3. Electric target practiceapparatus for a gun com*- =prisin'g vlight projecting insert means removably iitted within the barrel of the gun andhaving an electric light energizing circuit conductively coupled between the barrel of the gun Aand an insulated actuating contact, a cartridge casing Vhaving a closure face atfone fend vand removably fitted within the-chamber ofthe gun, a 'plunger contact extending through Vsaid closure face at a position to receive the firing pin of "the gun, ya main coil spring mounted within said casing Vand having a winding shaft extending therefrom, a train of gears geared to said s'haft,V an escapement including an 'escapement wheelV Igeared to -said gear train and a rotatable detentfor engagement with the escapement wheel, -releasable lock means connected to said depressible contact fr urging said detent into engagement with the escapement wheel and disengaging the detent therefrom in vresponse to depression of the contact, electric conductor means insulatedly mounted within said -cas'ing and extending into contacting engagement with 'the actuating contact of said insert means, a contact lever secured to the winding `shaft of said main spring and rotatably driven thereby upon release of the lock means between a V'iixed llimit and a point of intersection with said `conductor means to thereby electrically couple said barrel 'to the insertmeans actuating contact and close said light energizing circuit, 'and adjustment means for varying the rotational angle `between said xed limit and point Vof intersection of said contactlever 'and conductor means whereby ythe time delay between depression of said depressible contact -by the firing pin and closing of the light energizing circuit 'is rendered adjustable. l

4. Electric target practiceapparatus as defined byfclaim -3, but wherein Vsaid light projecting insert means is Lfurther defined as comprising an 'elongated tubular housing removably fitted vwithin the barrel of said gun and extend'- ing from afpoint .proximate the chamber yt'hereofout of the muzzle, 'a light -bulb vcoaxially mounted withi'nsaid housing at an intermediate point thereof with vthe base of "the bulb in electrical contact with the housing, at

least one battery coaxiallydisposed within the rearward portion of said housing with 'the central terminal of the battery in contacting engagement with the central termina'l of said light'bulb, an electricallyconductingbridge member insulatedlyemounted within the rearward portion of 'said housing and Vhaving a spring loaded contact 'at one end bearing against the base vface of said battery'and withsaid actuatingco'nt'act at 4the other end, and alight projecting lens tube disposed i'n telescoping relation within the forward portion kof said f housing.v in receiving -relation to-light`ema`nating Vfrom the envelope of said bulb.

5. Electric target practice apparatus as defined by claim 3 but wherein said releasable llock-means corn- Yprises an elongated axially translatable release bracket secured at oneend Vto said depressibleY contact `and havingfanormally.projectinglug'fat the other end engaging s aidvdetent'andforcingfsame into engagementwith said 4esca'peni'ent `wl'ie'el when 'the 4bracket fis -in Vits `unactuated rearward "extreme of translation.

:6. Electric target fpractice apparatus as dened 'by elaim f3, `-but vwherein 's'aidtconductorjmeans includes said adjustment means and rcomprises an elongated Vcontact plate insulatedly mounted for axial translation within said casing, said plate contacting the actuating contact of said insert means at one end and having an inclined portion at the other end in receiving relation tosaid contact lever, and fastener means for fixing said plate in varied positions of axial translation whereby the contact lever contacts the inclined portion at correspondingly varied positions of rotational angle.

7. Practicet ire simulating apparatus for a gun comprising light projecting insert means removably tted within the barrel of the gun and having an electric light energizing circuit conductively coupled between the barrel of the gun and in insulated actuating spring loaded plunger contact, an electrically conducting cartridge .casing `having a closure face at one end and removably iitted within the chamber of the gun, said casing having iirst and second accessopenings inthe walls thereof, a depressible spring loaded plunger contact extending through the center of said closure face in receiving relation to the firing pin of said gun, an insulating mounting block secured within the open end of the casing and extending into close proximity With the actuating plunger contact of said insert means, a pair of transversely spaced .parallel mounting plates secured to said mounting block and extending to a point proximate the closure face of said casing, one of said plates showing an axial guide slot, a coil spring mounted between said plates at the proximal end thereof relative to said closure face and having a winding shaft extending transversely through said plates in alignment with said first access opening in the casing wall whereby a key may be removably engaged with said shaft to wind the spring, an escapement wheel yjournalled between said plates, a gear train mounted between said plates and gearing said winding shaft to said escapement wheel, a detent rotatably mounted upon said iirst plate in overlapping relation to said guide slot for engagement with said escapement wheel, a rigid'actuating release bracket disposed slidably adjacent said lirst mounting plate, said bracket secured at one end to said depressible plunger contact and having an inwardly turned lug at the other end extending through said guide slot for engagement with the detent to force same into engagement with the escapement wheel when the depressible plunger contact is in its normal undepressed position, an elbow-shaped contact lever secured to said winding shaft and disposed adjacent tosaid second mounting plate, the forearm of said lever being substantially parallel to the edge of said plate when said spring is in wound position retained by said detent engaging said escapement wheel, a contact plate disposed slightly adjacent said insulating block and having an inclined end intersecting the rotational path of the end of said Vcontact lever andla lug at the other `end engaging the actuating spring loaded plunger contact of the insert means,'said contact plate further having a pair of axial slots, and adjustment fasteners extending through the slots of said 'contact lplate at positions opposite the second access opening of said casing to facilitate rigid attachment of the plate to the mounting block at adjustable positions of axial translation.

S. Practice re simulating apparatus fora gun as delined by claim 7 but wherein said lightfprojecting insert means is 'further defined as comprising an elongated tubular hcnisliiig'rembvably itted Within the barrel of said gunand extendingrfrom a point vproximate the chamber thereof "out of th'e'muzzlea light bulb coaxially mounted within said housing at an intermediate point thereof with the baseof lthe bulb in electrical contact with the' orifice, a telescoping tube disposed coaxially within the forward portion of said housing and first and second 1 lenses transversely secured to the opposite ends of said telescoping tube with said rst lens disposed adjacent said plug.

References Cited in the file of this patenv UNITED STATES PATENTS Griith July 2, 1935 Trammell Dec. 10, 1935 Hooker et al June 23, 1942 Varney June 14, 1955 FOREIGN PATENTS *y Great Britain June 11, 1943-

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