US 3579283 A
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Description (OCR text may contain errors)
United States Patent 2,720,634 10/1955 Hart Norman Welburn Watford, England 765,221
Oct. 4, 1968 May 18, 1971 AMP Incorporated Harrisburg, Pa. Oct. l2, 1967 Great Britain 46563/68 Inventor Appl. No. Filed Patented Assignee Priority CAM GRIP FLAT CONDUCTOR CONNECTOR 2 Claims, 3 Drawing Figs.
U.S. Cl 339/217, 3 39/ 274 Int. Cl II01r 9/08 Field of Search 24/249 (PP), 249 (FP), 134; 339/95, 97, 98, 99, 244, 248 (S), 217, 273, 274; 339/95 (D), 217 (S) References Cited UNITED STATES PATENTS l'hIII-II'IIIIIAVIA Primary Examiner-Marvin A. Champion Assistant Examiner-Robert A. Hafer Attorneys-Curtis Morris and Saford, Marshall M.
Holcombe, William Hintze, William .1. Keating, Frederick W. Raring, .lohn R. Hopkins, Adrian J. LaRue and .lay L. Seitchik ABSTRACT: An electrical connector primarily for at conductor cable uses a spring-loaded cam to provide backup pressure between a conductor of the cable and a contact in the connector.
Patented May 18, 1971 I NVENTUR NORMAN wnLBURN `ferrule for connection with a further conductor.
1 2 CAM GRIP FLAT CONDUCTOR CONNECTOR FlG. 3 shows a cross-sectional view of thie third embodiment in connection with a conventional wire coi'ductor.
This invention relates to a connector for making a connec- Referring now to FIG. l, the connector comprises a housing tin t a Surface Of a COlldllCtOl' 0f flat Strip material. l of insulating material having two passageways 2,3 in which The connector is particularly designed for connection with 5 cams 4,5 respectively are positioned, Eh cam is rotatably a conductor of a ribbon-type cable, Le., a cable having a, or a mounted on a pivot post 6,7 respectively molded in the Piiireiii'y 0f iiai Conductors embedded iii a fiat insiiiiiiiiig passageways. The cams 4,5 are formed by stamping them from Covering materiai- The ediidiietdr material is iisiiaiiy a COPPei' sheet metal, such as copper. The cam 4 is a contact cam and foil in such cables. However, the connector is not limited in its has an integral fermi@ 8 which is crimped Omo a wire cohducappattidiitd die riribdii'iypedeabies rid es; be Used) i0 iiiiaige i0 tor 9 which enters the rear of the passageway 2 ofthe housing C0 C Wi a Sii ace CO UCOr Qi'm dii a. Oar y l. The cam Sis a backu ressure cam and requires no ferrule. printed circuit or allied techniques. Furthermore, the connec- Both cams 4 5 are Spggg loaded by res'pcriv Springs 11,12 ribassista:mais;gasista wir, eg'zrdeeareofir os`n lan teu'drsiesote'cams. eeectote Ribboii'iype cabie conductors areiioi able i0 .ha-"e edrmee' i5 spriinlgsglLlZ is to birzisethe cams to rotate towards the center tiene mede t0 diemby Convieiiiioiiai teiiiiiqi-ies dfoideriiig 0r of the lioisin'g, and,r when no conductor is present, the two Crimping Siiiee die eeridiieioi' is iisiieiiy 0f d fregiie iiaiiire- T0 cams'a're ir`i"enga'gement. FIG.v 1i shows a ribbon cable in con- Ovei'cme this coiiiiectrs havqbeeniievisd W have e nectioniri The cablecomprises a foil conducplllurality gf teeth lwhich are l:zvlausedlbya wegdgll'lgactionto b lt 2O tor embedded between twol layers of insulatingV material iooigii d e msu aiioiiifof t e .cfab e ,arid info die edridiieioi'- l5,` 1 r6.A To make'a'conrie'ction, the insulation l5 is stripped e. isa vantage ofi is type o coniitfi' is that OItCe Oii' fror'rjorie side of the endv of thecable and the conductor 14 icg ilitshbeten Rade 31 cabi? eiiid .it ceimot ix; ieaiii' withiiiisulation 1 6 is inserted :through an opening I7 in the toThe onlnegilorclf zlinoiine'cttioerilisTol beplreesrirdilgaiiirberdf fiiqznii ,0f-f ii-msi-ngiLAslthef .Stripped en-d .of the cabi? meets times a limit on the amount of cable available ma be yiicoiirithei-iifa? 9i. the cams gwitzhcamdiwipiiigiy iigi-igiiig con' terediTh t t 1 d, d ductor 14, they arewpushedkaway 4from eachother loading the tepisifigvgiigggcgng toisbeisa van t aiid 'l1'12'. With the conductor 14 fully inserted against a i, a. connec. aii 'lectrical continuity exists between gisrtinntclted magy mes without the need for a fresh cable th ol-)dut'orl 1.4 thrigha cam 4. The Opposing sur- Angobjectpdfrthleeinvention is to provide aconriecto for 30. faiigsdf the-emile may be serrated thereby increasing their ie' f t n 've characteristics'.4 making a connection to a ,Surface'of-a iqoiiductoi Of-iiai 'Strip e llii'e to the actiori 0f thspiilgi-loaded cai-ns, if a force is ex- O' ing in a wall of the housing through whichthe condiictor 4 be passed to'ma'ke contact with thecontact and' aJ spring-loaded cam mounted in the hoilisi'rgand arrange td urge the conductor into engagement with the" contact member. Another object of the invention is thatl the on'ta'ct ase. l`his is on account of frictheconductorand cam'surfaccs pulling the cams r'with the aid of the springs and thus increasingth'ei 'Cds effect lf the'conductor 14 is to be purposely withdrawn, the cams 'Cuib-i,- 40 4`5ca`ri bei'biased away from the center by the insertion of may either separate from thecam or @ring-Pari if-, tools into the passageways 2,3. Alternatively, the Preferably, the contact member includes an integral crimping i an. bfe modied by providing them with ams extending e housing which can be lifted manually to'release the fr.' Flihe embodiment of FIG. l can be further modified plif'ied by dispensing with the cam 5 and allowing the conductor to engage the side of the housing on one side. ln siicli a modification, the cam 4 is used for both electrical contact and wedging of the connector. A less positive retention of the conductor is likely though than with the illustrated embodiment.
Turning now to the second embodiment shown in FIG. 2,
A further object is that the cam is preferablyarranged so as to present a minimumforce on the conductor'whe'nfmovcd iri the direction of insertion of the conductor into' the" l'i"ousiig" and a maximum force on the conductor when moved ina direction opposite to the direction of insertionJThe surface of the cam is preferably such as to enable it to make a grip ori the' conductor, and this may in one embodiment, be 5()v achieved by making the surface serrated.`
An additional object is that the housing may alsoinclude" means for enabling the cam to be lifted against the force ofthe iiiej iiiiiiec-toi compi-i955 a musing 2i of moided piasiic insu' spring to release pressure on the conductor and to enable it to iatiiig maieifiai having a pasageway 22 one wail of ltiie be withdrawn easily from the conductor. passageway is molded to provide a front and a rear shou der v i i i. d on a ost Other objects and attainments of the resent invention will 2324 respeiiyeiy1A aii i2 5 is ioiaiabiy moume p become apparent to those skilled initheut uponua reading of 26 arid Provided Wiiii a biasing SPi'iiig 27- Surface 25a 0f the the foiiowingtdoraiiod description when raken in conjunction Cai iS Sfratd 1 provide @Petter grip 0n the back of a with the drawihgs ihwhc'h there are Show'and dscbed printed circuit board inserted in the connector. This printed lustrarive embodiments of the ihvemiom' it is to b un 60 circuit board is formed of aninsulating board 28 having a deis'tood, however, that these embodiments are not intended primed eii'ciiit Conductor 2? o Onesuhface' 22 Th to be exhaustive nor limiting of the invention but are given for A Contact member 30 is inserted .iri e passageway is purposes of illustration in order that others skilled in the art C Oiiiaei member is 0f a bowed Shape and is formed from a may fully understand.the invention and the principles thereof SPririg Conductive meiai- Tiie from edge 0f die member etiand the manner of applying it in practical use so that they may gageS iiiefroiii Siidiiider 23 and a -rearwardiy eiiieridiiig'iariee modify it in various forms, each as may be bestsuite'd to the 3 1 engages die rear Siidiiider 24 tdioek die member i iiie conditionsofa particular use housing. The member 30 has an integral ferrule 32 which is Three different embodiments 0f `a connector in accordnc crimped toa wire 33. ln operation, the printed circuit board is with the present invention will now be described, by way of exinserted iIltO tile QOIlI'teCtQl' through a front SiOt 34 0f the hOUS- ample only, with reference to the three FlGS. of the accoming 21. The printed circuit 29 slides overthe bowed surface of panying'drawing. In this drawing: thercontact 30 in a wiping manner and giving an abutting con- FIG. l shows a cross-sectional view of the first embodiment tact. The cam 25 is rotated away from the contact member 30 in connection with a ribbon cable end; as the board is inserted. When the board is in position, the cam FIG. 2 shows a cross-sectional view of the second embodi- 25 under the action of spring 27 presses the circuit 29 into ment in connection'with a printed circuit board; and 75 good electrical contact with member 30. The serrations of serrated surface 25a on the cam 25 grip the back of the board 28 and prevent the dislodgement of the board or its accidental withdrawal from the connector.
The third embodiment of a connector is illustrated in FIG. 3 to which reference is now made. Here contact member 30 is similar to that shown in FIG. 2 and fits in a housing 36 in a similar manner. The same reference numerals are used for these similar parts in FIGS. 2 and 3. The cam 37 is, however, formed integrally with the housing during molding and the plastic material is chosen to be such that the cam 37 is resiliently connected with the wall of the housing 36 by a web 38 connected to one end of the cam. A V-spring 39 is fitted in compression between the cam 37 and the wall of the housing with one end of the spring located in a hole 40 in the wall of the housing 36. Surface 37a of the cam 37 is serrated, as in the previous examples, to improve the withdrawal forces. The conductor in this embodiment is a solid varnish covered wire 4l which has been stripped of insulant at its end 42 and flattened to form a tab` This tab is pushed into the connector through opening 43 causing cam 37 to flex away from the contact member 30 and bend about the web 38 compressing the V-spring 39. The contact member 30 wipingly makes contact with one side of the tab 42 of the conductor and is pressed into good Contact therewith by the action of the spring 39 acting on the cam 37.
Although in the three examples just described a different type of n'bbon conductor is used in each one, it should be appreciated that the particular type of conductor is not peculiar in its use to the connector with which it is described but may be used with any connector` lt will, therefore, be appreciated that the aforementioned and other desirable objects have been achieved; however, it should be emphasized that the particular embodiments of the invention, which are shown and described herein, are intended as merely illustrative and not as restrictive of the invention.
l. A connector for making electrical connection between a side of an end portion of a flat cable and a contact member, comprising a housing of insulating material having a through passageway, a resilient contact member and a spring-loaded cam extending longitudinally of the passageway and mutually urged into abutting relation, the contact member comprising a contact spring bowed towards the cam between its ends which are held against shoulders formed in a sidewall of the passageway, a slot extending inwardly from one end of the passageway in alignment with the interface between the contact member and the cam for reception of the end portion of the flat cable, means for limiting the extent of insertion of the flat cable into the passageway, the contact member having a lead connecting portion extending outwardly of the passageway away from the slot, reception of the end portion of the flat cable in the passageway tending to urge the cam and contact member apart.
2. A connector for making electrical connection between a side of an end portion of a flat cable and a contact member, comprising a housing of insulating material having a through passageway, a resilient contact member and a spring-loaded cam extending longitudinally of the passageway and mutually urged into abutting relation, the contact member comprising a further spring-loaded cam positioned on the opposite side of the passageway to the first mentioned cam, a slot extending inwardly from one end of the passageway in alignment with the interface between the contact member and the cam for reception of the end portion of the flat cable, means for limiting the extent of insertion of the flat cable into the passageway, the Contact member having a lead connecting portion extending outwardly of the passageway away from the slot, reception of the end portion of the flat cable in the passageway tending to urge the cam and contact member apart.