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Publication numberUS1601255 A
Publication typeGrant
Publication dateSep 28, 1926
Filing dateOct 11, 1924
Priority dateOct 11, 1924
Publication numberUS 1601255 A, US 1601255A, US-A-1601255, US1601255 A, US1601255A
InventorsAnthony Marra
Original AssigneeAnthony Marra
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrical attachment plug
US 1601255 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Sept 28 was;

` A. MARRA ELECTRICAL ATTACHMENT PLUG Filed Oct.. ll, 1924 lo for a yment plugs and has for its Aco-acting wedge 12.

Patented Sept. 28, 1926.-

UNITED STATES 1,601,255y Price.



.Application led October 11, 1924. Serial No. 743,056.

This invention relates to electrical attachprimary object. the provision of a plug which may be removed from an electric socket by pulling -upon the electric cord leading to the plug,

without the fear of the conducting Wires pulling away from the terminals of the plug.

Another object is to provide an attachment plug in which the end of an electric -cord is inserted whereby the greater the pulling action upon the cord, the greater is the clamping action between the cord and the plug.

v A further object of the invention resides in anattachment-plug, capable of performing Athe above 'functions' which is simple in construction, lcheap of manufacture and easy .to assemble or disassemble. Y

l/Vith these and other objects in view, the" invention resides'in certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fully described, are particularly 'pointed out in the appended claims, andare f illustra-ted in the accompanying drawing,

Figure 1 is a vertical sectional view of my improved attachment plug.A

Figure 2 is a vertical transverse sectional View on theline 2 2 of Figure 1. Figure 3 is a bottom plan view.

Figurcfl is a detail perspective view of the wedge.

Figure 5 is a horizontal sectional viewthrough the wedge.

Referring more particularly to the drawing, the reference numeral 10l designates my improved plug in its entirety and which includes but two parts, namely a cap 11 and a The cap 11 is constructedV of relatively hard insulating material, and has its under- A slot 111 is formed ing .a kink in able insulating material 'such as rubber, the body of which is lbifurcated to provide spaced diverging jaws or legs 22 between which the electric cord clamped. The wedge is formed with a neck 23 havinga smooth bore 24 therein and ,Whichneck is of a more flexible quality than the body of the wedge. The neck extends through the opening 17 in the cap and is cord 2l. p In practice, the end of the electric cord is stripped to expose the leads or wires 20,

21 is adapted to be,`

after which the cord is inserted through the mouth of the wedge so that the wires extend a slight distance b'eyond the other end of the wedge. The neck of the wedge is now inserted through the until the neck 'projects from the cap, after which the. same. is given a pull to cause the. inclined walls of the slot to compress the jaws 22 about the electric cord 21, thus causthe cord by reason of the coact'ing corrugations. As the wedge is pulled through. the slot, the teeth on the wedge will co-act with the teeth on the walls 0f the slot and serve to lock the wedge against removal. The wires 20 are then connected with the screws 19 when the plug is ready for use. It will now be seen that any pulling upon the electric cord will tend lto set up a greater wedge action between the cap and the wedge and consequently between the jaws of the wedge and the electric cord.

When it is desired to disconnect the cord from the plug, the wires 2O are unfastened from their terminals and a sharp instrument inserted bet-Ween the cap and the wedge through the wide opening of the slot to compress one of the jaws 22 tovdisengage the c0- acting teeth. When the wedge is removed from the cap, the tendency of the jaws is to expand, thereby releasing the electric cord.

i While I have described what I deem to be the most desirable embodiment of my invention,y it is obvious that many of the details may be varied without in any way departing wide end of the slot 14 from the spirit of my invention, and I therefore do not limit myself to the exact details of construction herein set forth nor to anything less than the whole of my invention limited only by the appended cl aims. It will also be apparent that my invention may be used in various other capacities wherein it is desired to anchor the end of a flexible cable or rope.

What is claimed as new is f '1. An attachment-plug comprising a cap having a slot therein, a member having a bore for the passage of an electric cord, normally expanding jaws on said member, and co-acting means on said memberand cap for compressing said jaws about an electric cord upon the insertion of said member in the bore of said cap, and for locking said member and cap against separation, said coacting means including opposed teeth on the i end walls of said slot, and teeth on the exterior faces of said jaws for engagement with each other.

2. An attachment plug comprising a cap having va slot therein, the end walls of the slot tapering toward each other, a member having a bore therein for the passage of a flexible cable, jaws formed on said member ment with the iexible cable.

3. `A`n attachment plug comprising a cap Ihaving' a slot extending therethrough, the

opposed end walls of the slot tapering toward each other and being provided with teeth, a member having a bore therein and being bifurcated to provide yieldable legs, the bore communicating with the bifurcation for the passage of a flexible cable therethrough, the inner faces of said legs having co-acting corrugations formed thereon, and teeth formed on the exterior surface of said legs for coaction with the teeth on said cap for compressing said yieldable legs `toward each other to grip the cable and for locking said member with said cap.

In testimony whereof I have affixed my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2697817 *Sep 8, 1949Dec 21, 1954Thomas FratilaElectrical connector
US2756403 *May 13, 1955Jul 24, 1956Gen ElectricCombined cord connector and strain relief
US3056852 *Mar 31, 1961Oct 2, 1962Leslie W SachsStrain relief grommet
US3253308 *Aug 3, 1964May 31, 1966Fargo Mfg Co IncCompression anchoring device
US3435403 *Aug 29, 1966Mar 25, 1969Thomas & Betts CorpMulticonductor cable connector assembly
US3524228 *Jul 9, 1968Aug 18, 1970Kelly William FAnchor for post-tensioning prestressed concrete
US4349240 *Nov 10, 1980Sep 14, 1982General Electric CompanyAppliance strain relief
US4370016 *Dec 18, 1979Jan 25, 1983Derek HayesElectrical coupling devices
US4398785 *Sep 28, 1981Aug 16, 1983Essex Group, Inc.Electrical connector and method of making same
US5080608 *Jun 6, 1990Jan 14, 1992Yarnton William WElectrical plug connector
US5547396 *Oct 4, 1994Aug 20, 1996International Business Machines CorporationUse of semi-interpenetrating polymer networks for cable/fiber retention
US6123569 *Dec 4, 1996Sep 26, 2000Yazaki CorporationCharging connector for electric vehicle
US6230405 *Nov 17, 1999May 15, 2001Hon Hai Precision Ind. Co., Ltd.Method for manufacturing a cable connector assembly
US7722259Jul 30, 2008May 25, 2010Iconn Systems, LlcCable connector assembly
US8450610May 28, 2013Iconn Systems, LlcCable connector assembly
US8734178 *Mar 23, 2012May 27, 2014Fuji Electric Wire Industries Co., Ltd.Electrical plug-provided cord
US20100025069 *Mar 19, 2009Feb 4, 2010Smith Iii Robert LCable and a method of assembling same
US20100027942 *Jul 30, 2008Feb 4, 2010Smith Iii Robert LCable connector assembly
US20100186989 *Apr 1, 2010Jul 29, 2010Guillermo AlveloCable and a method of assembling same
US20130115799 *Mar 23, 2012May 9, 2013Fuji Electric Wire Industries Co., Ltd.Electrical plug-provided cord
EP2451019A1 *Jun 18, 2010May 9, 2012Yazaki CorporationMethod for integrally forming connector, and connector
WO1980001339A1 *Dec 18, 1979Jun 26, 1980D HayesImproved electrical coupling devices
U.S. Classification439/460, 439/447, 439/695
International ClassificationH01R13/585, H01R13/58
Cooperative ClassificationH01R13/585
European ClassificationH01R13/585