US2240394A

US2240394A - Electric plug

Info

Publication number: US2240394A
Application number: US206821A
Authority: US
Inventors: Eaton George
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-05-09
Filing date: 1938-05-09
Publication date: 1941-04-29
Anticipated expiration: 1958-04-29

Description

pril 29, 1941. G, EATON ELECTRIC PLUG Filed May 9, 1938 INVENTOR.

1 George 2'1"@ ton.

` BMV ATTORNEYJ.

.Patented Apr. 29, l9fil UNITED STATES PATENT OFFICE 2,240,394 ELECTRIC PLUG George Eaton, Cleveland, Ohio Application May 9, 1938, Serial No. 206,821

3 Claims.

has now been increased to ilfty pounds, soit is understood, as a still further safe guard.

The present form o! invention involves the same principle as in the companion case, supra, and is considered to be simplined and hence less expensive to manufacture, without however sacriicing its eiiiciency and dependability.

Accordingly, the object of this invention is to provide a simplified means for relieving the strain to which the electric wire connections would otherwise be subjected, such means being capable also of easy application to the electric plug.

Other objects will appear from the following description and claims when considered together with the accompanying drawing.

Fig, 1 is a view showing the interior of an electric plug in which my present improvement is embodied:

Fig. 2 is a view taken on line 2-2 of Fig. l;

Fig. 3 is a view taken on line 3-3 of Fig. 1; and

Fig. 4 is a view of the strain-relieving means itself. A

It is to be Vunderstood that the present form of disclosure is vmerely for purposes of illustration and that there may be devised various modications without departing from the spirit of my invention as herein described and claimed.

Referring to the accompanying drawing, the plug casing comprises the'upper and lower members IV and 2 whichare secured together by the and has a. rear opening through which the elecspring coil Iii.

tric cable extends, this cable being indicated by reference numeral are indicated by The clip members reference numerals 5 and 6. are of duplicate form and will the same general manner of operation as is more in my prior Patent No. 1,905,452, April 25, 1933.

The principal form of clip herein illustrated mprises the upper are adapted to engage the curved portion of the upper clip member just rearwardly oi' the vertical plane through the axis of the The ribs are cabllelwouldberemoved ber by extending the button portion through the opening in the casing member, while the lateral extensions la will then prevent removal/of the same from assembly.

Immediately beneath the rear ends of the upper clip members, the lower clip members areV provided with integral loop portions for attachment of the electric wires, as indicated at Id. Upon inserting the wire ends into the loops, they are clamped into firm engagement therewith, and this form of connection is especially well adapted for use in connection with the presser button type of clips.

The means for relieving strain to/ which the wire connections would otherwise/be subjected, consists of the sheet form of fibre or other electric insulating material I which is provided with the middle aperture I6 and the I1 upon each side of the opening I6. The cable l is adapted to be threaded throughV the aperture II and the bared wires extended individually through the slots, in the manner indicated itself serves also in *just outside of the and an annular groove is provided, cable aperture, to receive the wire sheath around the table 4,

larger end of the familiar the cable l. Thus the endportions ofthe electric wires are eifectively enclosed within the casing and there is afforded eective insulation throughout. In fact, the strain-relieving device the capacity of an electric insulation wall.

open-end slots in Fig. 1, the ends of the individual wires being attached to the loops Il, aswabove explained. y It will be observed that the number of slots upon each side oi the middle aperture I6 is such that the wire end portions extend forwardly after the wireshave placed inthe slots in the manner expiainedJ/VBy having the openend slots, the wires can be more readily placed the same, it being understood that the are so arranged in the slots before placing the strain-relieving device within the plug casing. If sodesired, two separate apertures could be providedfinstead of the single middle aperture I6; in which case'the outer sheath of the and the individual inminted wires extended through me individual shpued f, these parts are placed When ther strain-relieving device has been to the wires in the manner just explained, and the ends of the wires have been connected to the clip members, as also explained, within thence/sing members V(which are then/secured together by means of the bolts l. For this purpose, the inner surfaces of the casing members I and 2 are provided with grooves for receiving the edge portions of the sheet member I5. These grooves serve not only to positionvthe strain-relieving device I6 but theysrve also to close the ends of the slots I1 which are thereby converted into what virtually become apertures. The walls of these grooves are higher upon the two sides of the aperture I6 than they are at the aperture I6 so as to provide secure means of engagement for the strainrelieving means ,I5 and also to restrict the apertures, which are formed thereby, to the desired size. It will be observed from Fig. 3 thatthe passages at the sides of the middle aperture are in lateral alignment therewith. By making the slots 'of substantial depth, as herein indicated, the insertion of the wires is greatly facilitated but without interfering with the required strength of the body I5 which is afforded substantial support and reinforcement by the manner of engagement in the deepened grooves for the side portions of the body I5, as above explained.

As indicated in Fig. l, the strain-relieving device i5 is so positioned in the plug casing that there is allowed sumcient space for the turns of the wires forwardly and rearwardlythereof. The aperture through the rear end casing is of just suicient size to accommodate of the plug My present form be stamped out of-sheet material at comparatively little cost, the open-end slots permit the application of the wires thereto in a comparatively easy manner, and this device can be applied tothe plug casing in a simple manner and with ample strength to withstand the strain to which the wire connections would otherwise be subjected. Virtually, the strain-relieving device, as herein provided, becomes a part of the plug casing itself when in assembly. Needless to say, the wires are eiIectively maintained against dislodgment by the strain, by virtue of the tortuous manner in which they are threaded through the passages provided in the strain-relieving device.

It is to be und that so far as the strainrelieving device -itself is concerned, it may be employed in connection with other forms 'of clips and not, only with the particular form of clip herein disclosed.

What I claim is:

1. An electric appliance including a longidudinally divided chambered insulation body, terminals within said body for wires thereto, said body having an aperture for passage of the electric cable therethrough, and anchoring means located within said body and between said aperture and said terminals, for relieving said wire connections from strain to which the electric cable might be subjected` outside of said body. said anchoring means comprising a substantially rectangular insert of electric insulation material arranged in a plane substantialiy` normal to the longitudinal axis of said body and having a plurality of sets of laterally spaced open-end transverse slots for the tortuous passage therethrough of the individual wires, the companion halves of said body having inner companion recesses t y of the inner surfaces and of the longitudinal axis thereof for positioning said anchoring means therewlthin ,against displacement in either direction and for closing theopen ends'of said slots when in assembly. 1

2. An electric appliance including a longitudinally divided chambered insulation body, terminals within said body for connection of the electric wires thereto, said body having an aperture for passage of the electric wires therethrough, and anchoring means located within said body and between said' aperture and said terminals. for relieving said wire connections from any strain to which the electric wires might be subjected outside of said body, said anchoring means comprising a substantially rectangular insert of electric insulation material arranged in a plane substantially normal to the longitudinal axis ofsaid body and' having aperture means through the middle part thereof and having upon of strain-relieving device can connection of electric',

said recesses in the middle part of sziidL body be- 1o said body having companion recesses transot said aperture means. y 1 portions thereof for positioning said anchoring 3. An electric appliance including a longitudimeans therewithin against displacement in nally divided chamber-ed insulation body, etermieither direction and for closing' the open ends nal within sid body for connection of the elec- 15 of said slots when in assembly, and the walls of relieving said wire connection from any strain 20 GEORGE EATON.