US1675763A - Handle for portable incandescent lamps - Google Patents

Description

July 3, 1928. 1,675,763

c. T. MCCARTHY HANDLE FOR PORTABLE INCANDESCENT LAMPS Filed April 25, 1927 Carhifi/eww@ lll " the lamp socket.

Patented July 3, 1928.

UNITED STATES 1,675,763 PATENT OFFICE.

CHARLES MCCARTHY, OF SOUTH WEYMOUTH, MASSACHUSETTS, ASSIGNOR- OF 0NE- HALF TO EDWARD R. HARTON, OF MEDFORD, MASSACHUSETTS.

HANDLE FOR PORTABLE INCANDESCENT LAMPS.

Application led April 25, 1927. Serial No. 186,242.

This invention relates to an incandescentlamp supplied with current by circuit wires enclosed in an insulating sheath, the wires and vsheath constituting an elongated flexible cable, one end of which is connected y with the inner end of the lamp socket. The connection of the insulating material of the cable with t-he lamp socket is liable to be pulled away from the socket by relative twisting or turning movements of the handle and socket and longitudinal strain on the cable.

It is customary to provide a portable lamp with a tubular hand grip which receives the lamp socket and the portion of the cable connected with the socket.

One object of the invention is to provide a handle which is adapted to be compressed upon and firmly gri the cable, and thereby prevent liability of etaching the cable wires from the lamp socket by longitudinal strain exerted on the cable, as when it is being dragged over a floor.

Another object is to enable the handle to be interengaged with a projection on the inner end of thelamp socket, so that neither can be turned independently of the other, and thereby prevent liability of detaching the wire from the socket by twisting strains.

The general object is to permit the engagement of the handle with the socket and cable in such manner as to obviate liability of accidental separation of the circuit wires from the socket.

Of the accompanying drawings forming a part of this specification,-

Figure 1 is a side elevation, showing my improved handle. applied to the socket and cable of an incandescent electric lamp.

Figure'2 is a View similar to Figure 1, the wire guard shown by Figure 1, and the handle being shown in longitudinal section.

Figure 3 is an end view of the handle. and shows by dotted lines the inner end of Figure 4 is a section on line 4-4 of Figure 3.

Figures 5, 6 and 7, are elevations showing the lamp socket as viewed from diii'erent points.

yThe same reference characters indicate the same parts in all of the figures.

In the drawings, 12 designates an electric lamp socket adapted, las usual, for engagement with a lamp bulb 13. The socket is of common form used in portable lamps, and has at its inner end the usual oblong projection 14, the form and arrangement ot which is shown by Figures 3, 6, and 7, and by dotted lines in Figure 3. The holes 15 in the socket are for the reception of the usual conducting wires 16, extending through the insulating sheath 16a said wires and sheath constituting a cable which may be of any desired length. The portions of the Ywires emerging;fromv the inner' end of the sheath extend lthrough the holes 15. The portions of the wires extending into the holes 15 constitute the only means for connecting the cable with the lamp socket.

My improved vhandle is adapted for engagement with the projection 14 of the lamp socket, to prevent the turning of the handle on the socket and the twisting of the wires where they enter the holes 15. The handle is also adapted to be compressed on and rmly grip the cable, to prevent the end portions ot' the wires from being pulled out of the holes 15 by a longitudinal strain exerted on the cable when a considerable length thereof is dragged on a floor or the ground, while the handle and lamp are being moved from place to place.

The handle is tubular and preferably turned by a lathe from a block of wood. The handle comprises an elongated grip portion 18, having a longitudinal bore, and an enlarged head portion 19. The bore of the grip portion is formed to receive the cable, so that after the cable is connected in the usual manner with the lamp socket 1,2, it may be threaded through the handle. The head 19 has a recess 20. formed to receive the lamp socket 12. In the inner end wall of the recess are transverse slots 21, arranged to receive the projection 14 on the inner end of the lamp socket, as shown by Figure 2, and by dotted linesin Figure 3, the projection engaging the sides of the slots and preventing the handle from turning relative to the socket 12 and the cable.

The grip portion 18 is provided with longitudinal slots 22.v rendering its outer end compressible. The handle includes a clamp 23 of any suitable construction, embacing the slotted portion and adjustable to permit the edges of the slots 22 to spring apart, asshown by Figure 4, and to approach each other, as shown by Figure 1. When thel clamp is contracted, the outer end of the handle i bore i grips the cable and (prevents endivise vmovement thereof, relative fte the lhandle and lamp' socket, so that there-is no liability of. the pullingoffthe Wires Out-OTE 5 the socket. AThe SlotsQQ:arepreferably--`\/- shaped7 their sides meeting` at the inner vends olf' the elote. This fiorite 11e -`m1..ts=ftlie .fslot Vedges to Close together, as shown by Figure l, whenV the slotted portion zrisV eoinpreefsed.V 10 24 designates a Wire cage, which may have asplit neel; v25,'embracinga groove'zZG in the socket 12, `and confined in the Ygroove by the headi-lQ?1 the outer end of which 'overlaps Ythe groove,

l. A handleadapted for engagement with a. portable electric lainp socket, and'vvith a 'flexiblecenductingoahle connected with the socket, said 'handle comprising' van elongated d20 tuhular'rgr-ip portion whose bore is -forined to reeeiver't-he cable, and -anv enlarged head` portion-'havinga'recess formedA to lreceive theylamp socket, the grip portion havingl longitudinal slots rendering `its Vouter end if compressible,-so that its bore is Vadapted to f Y grip Ythe cahle Vand-llprevent the separation ltn-d-ina-lly' slotted portion and adapted to rin-aint-aingthe same eoinpressed on the cable.

Vceive a projection on'the inner `-end of Vthe ofthe cable from the socket, the `handle comprising-also a clamp embracing the longi- Q. A handle adapted: 'for engagement VWith a portable electric lamp socket, and With a' exihleeondncting'cable Yconnectedy With the socket said handle coin arisinfr an elono'ated tubular-grip portion Whose here is formed 3 to receive the cable, and an enlarged headv lportion having a recessiormed' to `:receive the lamp socket, the inner end- Wallbf'the re# cess having' transverse slots arranged toresocket and prevent the handle 'from turning on the socket and cable, Athe grip portion havin 0" lone'itu'dinal Slots renderine itsoiiter 2j D fsignatur-e. Y y

CHARLES iMoG-ARTHY.

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