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Publication numberUS2380908 A
Publication typeGrant
Publication dateJul 31, 1945
Filing dateAug 4, 1943
Priority dateAug 4, 1943
Publication numberUS 2380908 A, US 2380908A, US-A-2380908, US2380908 A, US2380908A
InventorsAnne Heller, Blackman Irwin N, Leon Cooper
Original AssigneeInsuline Corp Of America Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pin jack for multiple plug-in connectors
US 2380908 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

July 31, 1945. A. c;-r HELLER PIN JACK FOR MULTIPLE PLUG-IN CONNECTORS Filed Aug. 4. 1943 mwl .Illlll'l Ill IIIIIIIIIIIIIIII l|||||||| BY l brrame/ Patented July 3l, 1945 PIN JACK FOR. MULTIPLE PLUG-1N CONNECTORS Alexander G. Heller, New York, N. Y.; Anne Heller, Irwin N. Blackman, and Leon Cooper, executors oi' the estate ot Alexander G. Heiler, deceased, assignors to Insuline Corporation of America, Inc., Long Island City, N. Y.

Application August 4, 1943, Serial No. 497,404


'I'he invention here disclosed relates to plug-in connectors and particularly to the pin jacks employed in such connectors.

These connectors comprise usually a plug having a number of pin contacts and a receptacle having a. corresponding number of jacks placed to receive such pins. These coupling members must be small in size and at the same time be of durable, rugged construction. The number oi circuits to be completed and hence the number of pins and jacks on these small coupling members may vary i'rom only one or two to eighteen or more. This means that the pins and the Jacks must be quite small. Diilcuitieshave been experienced in providing jacks for these multiple plugs which would hold the pins ilrmly enough to assure positive electrical connection, 'which would be strong enough to stand rough usage and which at the same time would be self-aligning or selfadjusting to compensate for variations or possible misaligmnent in the many pins ofthe plug.

Objects of the .present invention are to overcome faults such as mentioned, found to exist in present constructions and to provide a pin jack particularly for a multiple connector, which though small in size, will be of rugged construction and adapted to compensate for variations in the pin member and to at all times provide good electrical connection.

Other objects of the invention will appear in the course of the following specification.

The drawing accompanying and forming part ci the speciilcation illustrates certain commercial embodiments of the invention, but structure may be modiiled and changed as regards the instant disclosure, all within the true intent and broad scope of the invention as hereinafter defined and claimed.

Fig. 1 in the drawing is a longitudinal sectional view of the receptacle member of a multiple connector, showing one of the new lacks incorporated therein Fig. 2 is an end view of the receptacle.

Fig. 3 is a side view o! the .lack removed from the receptacle.

Fig. 4 is an enlarged cross-sectional detail as on the plane oi' line #-4 oi' Fig. 1.

Fig. 5 is a side view of a modified form oi' the jack.

The receptacle shown in Figs. l and 2, is of generally conventional design, comprising a screw shell l, interiorly shouldered at l, to support a correspondingly shouldered insulating block l, forming a base lor carrying the lacks.

The base piece is formed with cylindrical openings i0, to receive the jacks, shouldered at Ii, to form seats for the jacks and having smaller entrance openings i2, for the pin contacts I3, N,

- etc., which may be of diiferent sizes. the jacks corgesponding in size.

An insulating water i5, holds the Jacks in their seats in the base and is in turn held in place by a spring locking ring IB, engaged in a groove Il, in the interior of the shell.

Both the base and the wafer are secured in nonrotatable relation in the shell by a key rib i8, on the side o1' the shell engaged in aligned grooves Ill, 20, in the sides of the insulating base and Wafer.

The lack consists oi a generally cylindrical stud 2i, hollowed in one end to constitute a contact sleeve at 21. of slightly larger dimensions than the contact pin and holiowed in the opposite end to form a tubular wiring terminal 23, the latter portion being reduced to provide a shoulder 24, for holding engagement by the wafer I5.

In the iirst form of the invention shown in Figs. l to 4, the contact sleeve portion of the stud is reduced in diameter at 25, to leave an end ilange 26. and an opposing shoulder 21. A longitudinal slot 2l, is cut through this entire sleeve portion, it being shown extended in through the flange 1B, at the pin entry end and through the side of the stud past the shoulder 2l. At the upper end, this slot serves the purpose of a key groove, receiving a keying lug I9, on the wafer. which thus locks the lack against turning and locates the terminal portion in the desirable position for making the soldered connection with the wire.

A fiat strip of spring material l0, coiled into circular shape, is shown engaged about the reduced portion 25, and as having an inwardly struck portion li, extending radially in through the slot 2l, beyond the inner surface of the contact sleeve, Fig 4 In the illustration, the radially projecting portion Il, is produced by striking a plurality oi longitudinally aligned indentations I2, across one end ot the spring strip Ill, providing as shown in Fig. l, small arches which are detached at their inner edges at Il. from the body oi the strip. Because of their arched formation, these inwardly projected portions are rigid enough to act substantially as solid lugs exerting radial pressure on an inserted pin to force the latter diametrically over into ilrm engagement with the opposite side of the socket. The provision oi' one or more of these inwardly struck arches eects a gradual engagement with the pin as the latter is entered in the socket and in the final position, holds the pin over against the opposite side of the socket, solidly engaged with the wall oi.' the socket, at both ends ot the pin. Thisinsures extended surface engagement and hence good electrical contact, free oi resistance.

The spring holding strip need not be completely circular, Fig. 4, showing that it may be substantially C-shaped in cross-section, this providing sufiicient spring eiect to torce the` pin solidly into engagement with the side oi the socket.

The coiled spring strip can be engaged over the reduced portion of the sleeve between shoulders 26 and 21, by entering the intermediate portion of the coiled strip edgewise into the slot 2B, with the indented portion inside the sleeve and then rotating the coil to bring the indented portion out into the slot, as in Fig. 3. As shown in this view, the strip may have longitudinally extending lugs 34, 35, at the opposite edges of the same in line with the indentations 32, to enter and stand in the slot in this iinal position and thus to serve as retainers for holding the spring strip properly positioned on the sleeve. In the seated position of the jack, Fig. 1, any displacement of the spring strip will be prevented by the surrounding walls of the insulating base.

In the modified form of the invention shown in Fig. 5, the end flange appearing at 26, in Fig. 3, is omitted. This permits the coiled spring strip being forced endwise over the reduced portion 25, of the sleeve, without rst having to enter the strip through the slot and then rotate it into position. Besides greater ease of assembly, this second form of the invention permits of the spring being coiled for a closer tting engagement on the reduced portion of the sleeve, so that it is held in position by such spring irictional engagement. Once in position in the socket, the spring is held against any possibility of disengagement by seating against the shoulder Il, Fig. 1, and by binding pressure on the sleeve occasioned by insertion of the pin in the sleeve.

The contact sleeves can be inexpensively produced from cylindrical rod stock, drilled in from opposite ends to form the contact socket and wiring terminal. such end portions being turned down to i'orm the reduced end portions and the abutment shoulders 2l and 21. the iirst of such shoulders for holding engagement by the insulating wafer I5, and thesecond shoulder for positioning the spring holding band.

The coiled spring is easily made of tlat spring stock curled to the necessary curvature and indented at one end with the small aligned arches to enter the slot and frictionally engage the pin contact. n

The longitudinal slot in the side of the stud provides an entrance for the'lndented pin engaging portions of the spring and serves when engaged by the key lug on the wafer to secure the stud in properly angled position. The coiled springs are easily engaged over the ends o1' the contact sleeves and can, if necessary, be readily removed for replacement. The longitudinal slot 2B need not be cut through the end of the stud and in such event, the C-shaped spring strip may be engaged over the reduced portion of the stud by iirst entering one end of the C-shaped piece through the slot and then rolling the piece circumferentially into the final position illustrated in Fig. 4.

assaoos What is claimed is: 1. A pin jack for a multiple plug-in connector comprising a-rigid contact sleeve having a slotin one side extending longitudinally inwardly from the .pin receiving end of the same, and a. nat spring strip coiled about the slotted end portion of said sleeve and having a permanently in dented portion projecting radially inwardly through said slot beyond the inner surface of said sleeve into position to be engaged by a pin contact entered in said sleeve, said slot extending inwardly beyond said spring strip and an insulating holding member engaged over the opposite end of the sleeve and having a key lug entered in the inner end position of said slot.

2. A pin jack for a multiple plug-in connector comprising a rigid contact sleeve having a slot in one side extending longitudinally inwardly from the pin receiving end of the same and a dat spring strip coiled about the slotted end portion of said sleeve and having a permanently indented portion projecting radially inwardly through said slot beyond the inner surface o! said sleeve into position to be engaged by a pin contact entered in said sleeve and a retaining flange on said slotted end the sleeve, the slot extending through said flange to nable the coiled strip being slipped edgewise over the end of the sleeve with the inwardly angled portion entering through the slot in said flange.

3. A pin lack for a multiple plug-in connector, comprising a contact sleeve having a longitudinal slot at one side, a coiled strip of at spring ma terial engaged about the slotted portion of said contact sleeve, said strip being indented at one end transversely of the strip and in longitudinally aligned arches entered in said slot and projecting radially inward beyond the inner surface of the contact sleeve into position for engagement by a pin contact entered in the sleeve.

4.' A pin jack for plug-in connectors, comprising a contact sleeve having an open-ended slot extending longitudinally inwardly from the pin receiving end of the same. a strip oi iiat spring metal coiled in substantially C-shape and having portions at one end of the same bent angulariy inwardly and substantially radially of the center of said C-shape formation, said radially projecting portions being of a width to enter the open end o! the slot and whereby said coiled spring member may be engaged endwise over the end of the sleeve,-said C-shaped member being of a diameter to closely surround the contact sleeve and the angularly projecting end portions being of suiilcient extent to project radially through the slot past the inner circumference of the contact sleeve and means for retaining said spring member so positioned on the contact sleeve.

5. A pin Jack for plug-ln connectors, comprislng a contact sleeve slotted in one side of the same and a C-shaped pin retaining spring o! iiat strip spring material closely surrounding said contact sleeve and having integral inwardly arched portions at one end of the same projecting substantially radially through and beyond the slotted wall of the contact sleeve, said radially projecting arched portions having free side edges but left integrally connected at their ends with the main body of said at strip spring material.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2539230 *Oct 2, 1945Jan 23, 1951Rowe & Co Proprietary Ltd HElectrical power outlet and power plug
US2563713 *Sep 20, 1945Aug 7, 1951Bendix Aviat CorpElectrical connector having resilient inserts
US2695390 *Feb 14, 1951Nov 23, 1954Kent Jr Raymond CPlug and socket connector
US3029411 *Jan 11, 1960Apr 10, 1962United Carr Fastener CorpClosed-entry spring contact
US3169817 *Jun 19, 1961Feb 16, 1965United Carr Fastener CorpClosed-entry contact component
US3223963 *May 22, 1963Dec 14, 1965Gen Motors CorpElectrical connector
US5108301 *Feb 28, 1991Apr 28, 1992Torok Dale WLocking electrical cord connector
US5197897 *Apr 27, 1992Mar 30, 1993Torok Dale WLocking cord connector and method of locking an electrical plug and receptacle together
U.S. Classification439/847
International ClassificationH01R13/115, H01R13/11
Cooperative ClassificationH01R13/111
European ClassificationH01R13/11B