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Publication numberUS1298397 A
Publication typeGrant
Publication dateMar 25, 1919
Filing dateJul 26, 1915
Priority dateJul 26, 1915
Publication numberUS 1298397 A, US 1298397A, US-A-1298397, US1298397 A, US1298397A
InventorsGeorge E Purple
Original AssigneeFlexible Steel Lacing Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1298397 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



APPLICATION FILED IULY 26. |915. 1,298,897. Patented Mar. 25,1919.

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A and with an ear 18l on the opposite UNITED sTATEs PATENT oEEIoE.





Application filed July 26, 1915.

To all whom it may concern:

Be it known that I, GEORGE E. PURPLE, a citizen of the United States, residing at La Grange, in the county of Cook and State of Illinois, have invented new and useful Improvements in Lamp-Guards, of which the following is a full, clear, concise, description, reference being had to the accompanying drawing, forming a part of this specification. l

My invention relates-to lamp guards and the like, and more specifically to means for securing two sections of a lamp guard placed on the socket in such manner that it will be diflicult for an unauthorized person to remove the guard from the socket.

One of the objects of my invention is to rovide an improved device of this character which shall be simple in construction, ellicient in use and easy to manufacture. v

Further objects will appear from the description taken in connection with the appended claims.

In the drawings, in which I have shown one embodiment of my invention- Figure 1 is a side elevation showing a lamp guard secured in place on a socket;

Fig. 2 is a side elevation of one of the securing screws, the head being shown in section on the line 2-2 of Fig. 3;

Fig. 3 is a plan view of the securing screw;

Fig. 4 isa section on the line 4-4 of Fig. 1 showing the manner in which the two sections o@ the guard are secured together; and

Fig. 5 is a securing the guard in place on and removing it. A

Referring now to the drawings in detail I have shown my invention in connection with a lamp guard, indicated in general at 10, comprising two similar sections 11. Each of these 'sections comprises an upper and lower semi-circular member 12 and 13 respectively. united by ribs 14 which are shaped and positioned so that the two sections, when placed together. will inclose the bulb of an electric lamp. The lower semi-circular members 13 are hingedly secured together in any suitable manner as shown at 15. Each of the upper semi-circular members 12 is provided with an ear 16 having an opening 17 therethrough end provided with an opening 19 therethrough. The ear 18 is provided .with an annular upstanddetail showing a key used in the socket Specification of Letters Patent.

and exact Patented Mar. 25, 1919.


ing flange 20 stamped up therefrom and which is internally screw threaded for engagement with the screw which secures the two sections of the guard together. Each member 12 is beaded outwardly as shown at 21 for engagement with a corresponding bead on the lamp socket 22 whereby when the members 12 are drawn together the guard will be securely clamped on the socket and held in place. The members 12 are held together by means of two screws 423 each of which comprises a threaded portion 24 for engagement with the internally threaded flange 20, a smooth reduced neck portion 25 which lies within the opening 17 when the members 12 are clamped together, and a frusto-conical head 26 which engages the ear 1G. The head 26 is provided with a recess or socket 27, the walls of which comprise cylindrical portions 28, angular grooves 29 lying between the cylindrical portions 28, for engagementlwith the correspondingly shaped portions of a key, a flaring portion 30 for guiding the key into engagement with the groove portion of the socket, anda conical portion 31 at the bottom of the socket. The upper part of the head of the screw is flattened slightly as shown at 32 to prevent a sharp edge being formed thereon. The

screw 23 is operated by means of a bent wire key 33 (Fig, 5) comprising a handle portion 34, a stem portion 35 and a triangular socket engaging portion 36, the edges of which fit into the grooves 29 of the socket 27.

The use and operation of my improved device is as follows: The key 33 is inserted in the socket 27 of the screw 23 and rotated to unscrcw the latter from the `threaded flanges 20. The'two sections 11 are then opened about the hinges 15 and brought in position' about the bulb of the lamp and the portions 12' are then vbrought into engagement wit the socket 22, the bead 21 fitting over the corresponding bead of the socket. The screws 23 are then again threaded into the flanges 20 by means of the key 33 to clamp the members 12 tightly against the socket 22.

The unthreaded apertures 17 in the ears 16 are just large enough to permit the threaded portion 24 of the screw 23 to be threaded therethrough. This construction will prevent the screws from falling out of the ears 16 when they are not threaded into the flange 20. The neck portion 25 of the screw is small enough to permit the screw to rotate freely in the opening lZ after 'the portion 24 has been threaded therethrough-` The head 26 is made frusto-conical (being beveledoii at an angle of 22g`O to the axis of the screw) in order that it may bevery diiiicult for anyone to et a good hold on the head ofthe screw gy means of a. pair of pliers or the like, as the jaws of the pliers will slip off of the inclined surface. The

screws y23 can be made very quickly and cheaply on an/automatic machine and all three/of the grooves 2.9 can bemade by a sin fle operation of the press.

' aving thus described my invention what l5 I Aclaim as new and desire to secure by Letters Patent is 1. Means for securing two portions Aof a lamp guard having registering apertures tol gether comprising a screw for extending through one of said apertures and for threading into the other aperture, said screw having -a high, upwardly tapering Afrusto conica head having an axial non-circular .socket therein whereby said socket may be engaged by a non-circular key portion and whereby said head cannot be firmly grasped by pliers or rthe like.

2. Means lfor securing two portions ofa lamp guard having registering apertures together comprising a screw for extending through one of -said aperturesv and for threading into the other aperture, said'screw i having a head having an axial socket therein,

portions of the Walls of ssaid socket being cylindrical, ,said cylindrical portions being separated by an outwardly-closed key engaging groove.

In witness whereof, I have hereunto suhscribed my name..


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2417364 *Mar 14, 1945Mar 11, 1947Hunt Leslie ELamp protector
US2777353 *Oct 30, 1952Jan 15, 1957Robert W WillisScrew socket construction having tool guiding means formed therein
US5338142 *Jul 7, 1992Aug 16, 1994Michael GonzalesRotating quick release mechanism for securing parts to bicycles
US5364213 *Oct 25, 1993Nov 15, 1994Kyo-Fi Industrial CorporationCap for fastening devices for motor vehicle wheels and the like
US5494390 *Aug 10, 1993Feb 27, 1996Gonzales; MichaelQuick release mechanism for securing parts to bicycles
USD270229Oct 22, 1980Aug 23, 1983The Eastern CompanyTool and operator head for tool-operated lock
USD270424Oct 22, 1980Sep 6, 1983The Eastern CompanyTool operator for tool-operated locks
U.S. Classification411/402, 411/910, 362/378, 411/919
Cooperative ClassificationY10S411/91, Y10S411/919, F16B23/00