Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2750571 A
Publication typeGrant
Publication dateJun 12, 1956
Filing dateMay 13, 1952
Priority dateMay 13, 1952
Publication numberUS 2750571 A, US 2750571A, US-A-2750571, US2750571 A, US2750571A
InventorsJacob Schmier
Original AssigneeRodale Mfg Company Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 2750571 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

June 12, 1956 J. SCHMIER 2,750,571

CONNECTOR Filed May 13, 1952 l INVENTOR.

6 Jc/rm/er EA/[army United States Patent CONNECTOR Jacob Schmier, Allentown, Pa., assignor to Rodale Manufactoring Company, Inc., a corporation of Pennsylvania Application May 13, 1252, Serial No. 287,540

3 Claims. (Cl. 339103) My invention relates to an electrical connector and relates particularly to a plug used for a quick detachable connector.

In prior art quick detachable electrical connectors having strain relieving clamps to prevent the electrical cord from being pulled from the body of the connector have been used. The strain reliever enables the cord to be subjected to relatively hard usage without danger of injuring the electrical connector.

It is an object of my invention to provide an electrical connector wherein a hard insulator shell has a pair of adjustable clamps attached thereto.

Another object of my invention is to provide a plug or cap electrical connector with a pair of stamped adjustable clamps removably connected to said connector for ease of assembly.

Another object of my invention is to provide a detachable electrical plug or connector with an adjustable strain remover wherein the parts may be rapidly and economically assembled.

Other objects of my invention are to provide an improved device of the character described, that is easily and economically produced, which is sturdy in construction, and which is highly efiicient in operation.

With the above and related objects in view, my invention consists in the details of construction and combination of parts, as will be more fully understood from the following description, when read in conjunction with the accompanying drawing in which:

Fig. 1 is a perspective view of an electrical plug embodying my invention.

Fig. 2 is a sectional view taken along the line 2-2 of Fig. 3.

Fig. 3 is a fragmentary side view of the electrical plug shown in Fig. 1.

Fig. 4 is a sectional view taken along the line 44 of Fig. 2.

Fig. 5 is a view taken along the line 55 of Fig. 3, a top view of the plug looking towards the electrical contacts.

Fig. 6 is a perspective view of the cord strain reliever.

Referring now in detail to the drawing wherein a preferred embodiment of my invention is illustrated, I show an electrical plug having a molded insulator casing, generally designated as A, wherein a pair of electrical contact conductors, each of which is generally designated as B, are permanently aflixed by rivets. The contacts B are of the conventional type with a removable screw 10 therein so that one wire 12 of a cable, generally designated as C, may be attached thereto.

The shell A has a central passageway 14 through which the cable C passes, and radially extending from the central aperture are a pair of slots or slits 16, 18 having spaced walls.

The slot 16 has spaced parallel walls 16A, 16B, while the slot 18 has spaced parallel walls 18A, 183.

Interfitting with each one of the slots 16 or 18 is one clamp, generally designated as D. Two of the clamps D form a pair to engage and hold the cable C for the pu pose of preventing the pulling of the wires from their screw holders 10.

Each clamp D of similar construction comprises a stem 20 having at its free end a pair of laterally extending ears 22, 23. The other end of the stem is bent at an angle of at 24 to be the midsection which is wider than the width of the stem 20 and an oiiset 26 with respect to the stem 20, is curved at 27 to embrace the cord C. A pair of punched holding ears 28, 29 is formed on the offset 26.

The clamp D has its stem 20 slide into the slot 16 and it is prevented from being pulled out in the direction of the cord C by the ears 22, 23 engaging the underside of the Walls 16A, 1613.

The top edges of the walls 16A and 16B are engaged by the offset 24 so that the clamp D may not be pushed along the axis of the cord D.

The clamps D encircle the cord C and are held in place by screws 30, 30 and the stems 20 may be adjustably moved in either its slot 16 or 18. The radial distance between the slots 16, 18 when the cord C is in place must be less than the distance between the stems 20, 20 of each clamp D in order to prevent the strain reliever clamps D, D from being pulled away from the insulator body A.

The clamp D may be easily inserted in position by first placing one clamp into its slot and moving it radially as far as it will go then dropping the second clamp D into its slot and passing the cord C between the two strain reliever clamps D, D. The screws 30, 30 hold the clamps against the cord C.

Although my invention has been described in considerable detail, such description is intended as being illustrative rather than limiting, since the invention may be variously embodied, and the scope of the invention is to be determined as claimed.

I claim as my invention:

1. An electrical quick detachable connector having a pair of contacts, an insulator body to which said contacts are aifixed, and a strain reliever connected to said body, said strain reliever comprising a pair of clamps identically constructed, each clamp having a stem, a midportion and a wire embracing portion integrally formed together, said stem having sides from which ears laterally project adjacent the free ends of said sides, said midportion being wider than the distance between the sides of said stem, and a radially extending slit having side walls in said insulator body into which only said stem may pass and slide, said stem side walls and said slit side walls being adjacent one another.

2. The invention of claim 1 wherein said mid-portion rests above said insulator body, and said ears being located beneath the side walls of said slot.

3. The invention of claim 2, wherein said body has a central opening, a pair of slits radially extending from said central opening, said central opening being wider than said slits.

References Cited in the file of this patent UNITED STATES PATENTS 1,026,238 Anderson May 14, 1912 1,890,350 Webster Dec. 6, 1932 2,063,038 Von Holtz Dec. 8, 1936 2,201,213 Von Holtz May 21, 1940 2,553,681 Schmier May 22, 1951

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1026238 *Feb 15, 1912May 14, 1912Albert And J M Anderson Mfg CompanyElectrical connection.
US1890350 *Feb 4, 1931Dec 6, 1932Bryant Electric CoStrain relief fitting
US2063038 *Feb 1, 1933Dec 8, 1936Hubbell Jr HarveyAttachment plug cap
US2201213 *Jan 7, 1938May 21, 1940Hubbell Inc HarveyStrain relief
US2553681 *Apr 30, 1949May 22, 1951Rodale Mfg Co IncTwo-part strain relief clamp
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2989613 *Jan 29, 1960Jun 20, 1961Linton Summit Coal Company IncWrap-around heater
US3390369 *Jan 5, 1966Jun 25, 1968Killark Electric Mfg CompanyElectric plug or receptacle assembly with interchangeable parts
US3465280 *Mar 28, 1967Sep 2, 1969Bassani SpaFuse-holder
US3500291 *Jan 29, 1968Mar 10, 1970Hubbell Inc HarveyLocking electrical connector
US4241969 *Sep 18, 1979Dec 30, 1980Harvey Hubbell, IncorporatedLocking plug
US4284318 *Mar 19, 1979Aug 18, 1981Westinghouse Electric Corp.Electric plug
US4526435 *Aug 25, 1982Jul 2, 1985Cgee AlsthomCable clamping device
US5046961 *Nov 26, 1990Sep 10, 1991Hubbell IncorporatedPositive locking electrical plug
US5108297 *Nov 26, 1990Apr 28, 1992Hubbell IncorporatedPositive locking electrical plug with shielded blade protection
US7892045 *Oct 23, 2008Feb 22, 2011Tyco Electronics CorporationConnector having interlocking components
US7896683Oct 23, 2008Mar 1, 2011Tyco Electronics CorporationConnector assemblies configured to prevent damage to contacts during mating and demating
US7927150Oct 23, 2008Apr 19, 2011Tyco Electronics CorporationConnectors including spring tabs for holding a contact module
WO2001039334A1 *Nov 23, 2000May 31, 2001Fokker Elmo B VElectrical connector
U.S. Classification439/472, D13/138.1
International ClassificationH01R13/58, H01R13/595
Cooperative ClassificationH01R13/595
European ClassificationH01R13/595