US2123807A - Locked lamp guard - Google Patents

Description

, July 12, 1938. E. M. ROT-HEI@ 2,123,807

LOCKED LAMP GUARD n l Fild May 8, 1936 gl-II lll INVENTOR EDWARD M. ROTHEN BY Hls' ATTORNEYS Patented July 12, 1938 NITED STATE anat ATN

ries

LOCKED LAB/IP GUARD a corporation of New York Application May 8, 1936, Serial No. 78,712

6 Claims.

This invention relates to locked lamp guards of the type adapted to protect electric lamp bulbs which are removably mounted in sockets, from theft as Well as breakage, and has for its main object to provide a guard of this character which can be conveniently unlocked and then spread or opened out from the bulb in several directions in a limited space to facilitate relamping, whereby the guard may be mounted in reflectors, or in wells or recesses in walls or the like, and which can be readily relocked to prevent unauthorized removal of such lamp bulbs from their sockets.

Further objects are to facilitate the construction and operation of guards of this character and their locking devices, to render the same economical to manufacture and convenient to install and manipulate, and otherwise well adapted for the purposes set forth, as well as to minimize the shadow cast by the guard, and its obstruction to the light emanating from the bulb protected thereby.

Other objects and features of novelty will be apparent as the following description proceeds, reference being had to the accompanying drawing, in which Figure l is a side elevation of the locked lamp guard according to the preferred embodiment of the present invention;

Figure 2 is an inverted plan view of the locked lamp guard shown in Figure 1, a portion being broken away and shown in section;

Figure 3 is, an enlarged detailed section of the locking device, taken along the line 3 3 of Figure 2;

Figure 4 is a side elevation of a modification, showing the guard mounted in a light well;

Figure 5 is an enlarged section through the modified form of locking device; and

Figure 6 is an elevation of a further modification showing the lamp guard embodied in a reector.

The invention comprises broadly the combination of a support, a plurality of inclosure mem- 45 bers, and a locking device. The support is associated with the lamp socket, which as hereinafter exemplified can be of widely different forms, but preferably permanently mounted in position to be difficult if not impossible to remove. The in- 50 closure members are carried by this support and permanently secured thereto, and converge beyond the lamp bulb, and the locking device retains the same in position. When unlocked the inclosure members can be spread apart in several directions, independently if desired, to facili- (Cl. 24U-102) tate manipulation thereof in limited or obstructed space.

According to the preferred embodiment of the present invention, as shown in Figures l and 2, the support "l is in the form of a ring having a vertical annular flange 8 and a lateral flange E. Spaced around the inner wall of the vertical liange S are a plurality of points or inward projections l0 which are adapted to engage the outer rim of the lamp socket. This lamp socket is conventional, and as the lamp guard is adapted to be used with practically any type of socket, no illustration of the socket is deemed to be necessary in this View, although a socket ll and a lamp bulb l2 therein are indicated in Figure 4.

The vertical flange 8 of the supporting ring is further provided with a threaded boss l in which is mounted a screw l@ the head of which is so shaped as to require a special key to turn the same and therefore function as a lock. A triangular form is shown but it is obvious that any other irregular form could be used for this purpose. When this supporting ring l is applied over a lamp socket and the screw i4 is tightened up by means of the key, a socket is gripped by the points Il] and the screw ill which together securely hold the guard ring on to the socket.

A plurality of inclosure frames l5 are secured to the guard ring l and extend therefrom so as to converge beyond the end of the lamp bulb. These frames l5 are preferably loops of wire, the ends I6 of which are brought together and aligned to form a pintle. The outer flange 9 of the guard ring has upstanding ears il which, after the pintle I6 has been applied thereover, are bent down inwardly to form knuckles. Lugs I8 on the ring 9 at each end of the pintle i6 prevent lateral removal of the wire loop ends.

The upper portions of the sides of the loop l5 are substantially parallel, while the lower portions of these sides converge to form a terminal bight 20. In addition to converging toward each other, the lower portions of the loop are curved inwardly so that the bights 26 of the respective loops approach each other in closely spaced relation.

A locking device is provided for engaging the bights of all the loops and securing them together, to form the same into a cage about the lamp bulb. In the preferred form shown in Fig. 3 this locking device comprises a pair of clamping members 2l and 22 each of which has a jaw engaging each of the bights 20. 'Ihe member 2| has three such jaws 23 which are turned down at right angles over the bights 2 and the member Vrectangle of sheet metal.

22 has corresponding jaws 24 which are fiat and abut the turned down jaws 23. The fourth jaw of the member 2I has a narrow extension 25 which passes through a slot 26 in the turned up jaw 21 of the lower clamping member 22.

The member 22 has a central aperture which receives the reduced inner end of a sleeve 3U, which is spun over therewithin. A screw 3l passes through the sleeve 30 and engages threads in the clamping member 2I. This screw has a head 32 of special shape, the same as that of the screw I4, and it is a desirable feature of the present invention that the screws I4 and 32 may be operated by the same key. The boss I3 and the sleeve 30 present further difficulties to turning these screws without the special key. A spring 33 is coiled around the screw 3| between two clamping members and urges them apart when the screw is turned toward release position.

It should be noted that the inner end of the screw 3| is burred over to prevent the member 2l from being removed. Hence when unlocked, the locking device is retained by the bight 20 between the jaws 25 and 21, while the jaws 23 and 24 released the other three bights 20. When locked, these jaws 23 and 24 engage each other so tightly as to present a substantially iiush surface, and render it practically impossible to insert a screw driver to tamper with the lock.

In the form shown in Figure 4 the inclosure members or loops I5 are identical with those already described and will therefore not be again described in detail. In this form the frames I5 are carried by a base plate 34 which comprises a The knuckles to receive the pintles I6 are formed by loops of sheet metal which pass through slots in the corners of the base plate 34 and are turned over on the inner side. The base plate 34 has a central aperture which passes over the socket II so that the socket and the base plate 34 are both secured by the bolts 35 in the corners of the plate.

While Figure 4 shows a modied construction, it also illustrates the open position of the loops for the guard shown in Figure 1. When either of these guar-ds is mounted in a light well the walls of which are indicated at 36, the limited space around the light lampy bulb is nevertheless sufficient to permit the frames I5 to swing out a suflicient distance to permit access to and removal or replacement of the lamp bulb- I2.

In fact the form shown in Figure 1 may be employed in such a well without modification, provided that in installing the socket, after the socket has been wired and before it has been secured in place, the socket wires will permit the socket to be lowered a sufficient distance to receive the guard ring 1 and permit the locking screw I4 to be tightened thereon. After the ring 1 has been secured to the socket, the socket may be mounted or permanently secured in the bottom of the well 36 in the customary manner.

A modified form of locking device is shown in Figure 5. This form comprises cooperating members 31 and 38. 'I'he member 31 has a portion 40 wrapped around one of the bights 20 to form a knuckle while the lower member 38 has a similar knuckle 4I on the same bight 2U so that the two members 31 and 38 constitute a hinge permanently secured to one of the frames I5. The members 31 and 38 each have three cooperating jaws 42 and 43 for clamping the bights of the other three loops I5 therebetween. The locking screw 44 is swiveled in the outer member 38 and threaded in the inner member 31. A hollow cap 45 is swiveled under the head of the screw 44 and forms a sleeve therefor as well as a casing for a coil compression spring 46.

The head of the screw 44 has the same irregular shape as the heads of the lock screws I4 and 32, but when this screw 44 is turned to release the locking device the spring 46 still holds the jaws together. The outer ends of the jaws 42 and 43 are curved outwardly so that the bight 20 therebetween may be snapped in and out against the action of the spring 46, and yet when the screw 44 is tightened the bights 20 are securely retained in locking position.

The description given hereinbefore of the operation within the well 36 also applies to operation within a reflector. The reflector however, affords a still further modification such as shown in Figure 6. The pintles I6 of the loops I5 are pivoted in the knuckles 50 formed by rolled up portions of the reflector rim, lugs 5I being provided by the remaining portions of the reflector rim to prevent lateral removal of the pintles I6. The bights 20 of the loops are secured together by a locking device according to either Figure 3 or Figure 5, but it should be noted that the parts are constructed and arranged to bring the bights 20 close to the lamp bulb after it has been screwed into the socket. With this arrangement even though the greater diameter of the reflector might provide access between adjacent loops I5 suiiicient to turn the lamp in its socket, the lamp would abut against the locking device before it could be removed from this socket. Of course the pivots 50 could be moved up further into the reflector, or the sides of the loops I5 might be given a sinuous or maple-leaf contour which would prevent any access to the lamp bulb at all. Another expedient to prevent such access Within the contemplation of this invention is to provide a larger number of loops I5 and a corresponding number of jaws on the locking device.

With regard to the modifications described, it should be noted that these are particularly important as showing the broad applicationI of this invention. Accordingly, so long as there is a support which is constructed and arranged for mounting with respect to the socket to prevent unauthorized removal of the support, and the frames I5 are secured to the support and hav ing respective parts approaching each other beyond the end of the lamp bulb, the locking device engages these frames and forms them into a cage about the lamp bulb, and the ends of the frames are movable apart in different directions when unlocked, the details of the frames, the

support and the locking device may be varied considerably without departing from the broad idea of the present invention. The invention therefore embraces such embodiments of the broad idea as fall within the scope of the appended claims.

I claim:

1. A lamp guard for an electric lamp bulb removably engaged in a lamp socket therefor, comprising a support constructed and arranged with respect to said socket to prevent unauthorized removal of said support, knuckles on said support angularly spaced therearound, wire loops having terminal portions aligned end to end to form pintles received on said knuckles, means on said support adjacent said knuckles for preventing lateral removal of said pintles, said loops having other respective portions approaching each other beyond the end of said lamp bulb, and a locking device engaging said loops and preventing pivotal movement thereof and releasable to permit said pintles to turn in said knuckles, whereby said portions may be swung apart for authorized removal of said lamp bulb therebetween.

2. A lamp guard for an electric lamp bulb removably engaged in a lamp socket therefor, comprising a support annularly disposed about said socket, knuckles angularly spaced around said support havin-g axes outside of said socket, inclosure loops having straight portions forming pintles received in said knuckles, said loops having sides extending from said ilat portions and converging inward to terminals beyond the end of said lamp bulb, and key actuated means carried by one of said terminals and adapted to engage each of the other terminals to lock them all together to form a cage about said lamp bulb, said loops being released by unlocking said means to permit said terminals to be spread sufficiently for authorized removal or replacement of said lamp bulb.

3. A lamp .guard for an electric lamp bulb removably engaged in a socket therefor, comprising a plurality of inclosure loops, means for supporting said loopsl in angularly spaced positions about the axis of said lamp bulb and socket, said loops converging beyond the end of said lamp bulb and terminating in bights, and a locking device for securing said loops together to form a cage about the lamp and comprising cooperating members each having a jaw engaging each of said loops, a screw swiveled in one of said members and engaging threads in the other for closing and releasing said members, and a spring associated with said members and opposing the movement of said jaws in one direction.

4. A lamp guard for an electric lamp bulb comprising in combination with a reflector, inclosure members carried by said reflector and extending in conning relation about said lamp bulb, and means for locking said members in position to form a cage about said lamp bulb, said members being released by unlocking said device, and constructed and arranged to be moved apart to permit removal of said lamp bulb therebetween.

5. A lamp guard for an electric lamp bulb in combination with a lamp well, comprising a support within said well, and loops mounted inside said Well and extending in confining relation. about said lamp bulb, means for locking said loops in position to form a cage about said lamp bulb, said locking means being accessible from outside of said well, and said loops being released by unlocking said device, and constructed and arranged to be moved apart laterally within the confines of said well to permit endwise removal of said lamp bulb therebetween.

6. A lamp guard for an electric lamp bulb re movably engaged in a socket therefor, comprising a plurality of apertured inclosure members angularly spaced about the axis of said bulb and socket, the ends of said members adjacent said socket being mounted to permit the other ends to spread for the passage of said bulb therebetween, articulated securing means Iextending between at least one opposite pair of said inclosure members constructed and arranged to maintain said pair in spaced relation and hooking into the apertures thereof to form a cage about said bulb and key actuated locking means for retaining said articulated means in engagement with said apertures.

EDWARD M. ROTHEN.

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