|Número de publicación||US3851297 A|
|Tipo de publicación||Concesión|
|Fecha de publicación||26 Nov 1974|
|Fecha de presentación||29 May 1973|
|Fecha de prioridad||17 Jun 1972|
|También publicado como||CA985388A, CA985388A1, DE2329426A1, DE2329426B2, DE2329426C3|
|Número de publicación||US 3851297 A, US 3851297A, US-A-3851297, US3851297 A, US3851297A|
|Cesionario original||Amp Inc|
|Exportar cita||BiBTeX, EndNote, RefMan|
|Citas de patentes (12), Otras citas (1), Citada por (26), Clasificaciones (19)|
|Enlaces externos: USPTO, Cesión de USPTO, Espacenet|
nited States Patent [191 unro 1 1 SUBSTRATE CONNECTOR  Inventor: Geoffrey Hector .lames Munro, St.
' Pierre Du Bois, Guernsey (Channel Is.)  Assignee: AMP Incorporated, Harrisburg, Pa.  Filed: May 29, 1973  Appl. No.: 364,851
 Foreign Application Priority Data June 17, 1972 Great Britain 28483/72  US. Cl 339/61 M, 339/17 L, 339/176 MP  Int. Cl. l-l05k 1/07  Field 01 Search 339/17, 61, 59, 75 MP, 339/176 MF, 176 MP  References Cited UNITED STATES PATENTS 2,480,142 8/1949 Lager 339/61 R X 2,858,515 10/1958 Thunander et al. 339/17 LC 2,980,874 4/1961 Tarbox 339/17 F X 3,059,211 10/1962 Thomas et a1 339/17 F 3,188,601 6/1965 De Tar 339/75 MP 3,221,286 11/1965 Fedde 339/17 F 3307,13) 2/1967 Prise 339/17 F X 3,362,005 1/1968 Corns 339/17 M X 3,401,369 9/1968 Palmateer et al.. 339/17 LC 3,444,503 5/1969 Mallery 339/17 L X [111 3,851,297 Nov. 26, 1974 3,533,049 10/1970 Thompson 339/17 F X 3,818,414 6/1974 Davies et a1 339/17 M OTHER PUBLICATIONS Dunman, Printed Circuit Connector" IBM Technical Disclosure Bulletin, Vol. 7 No. 3, page 182, August 1964.
Primary Examiner-Roy D. Frazier Assistant ExaminerLawrence .1. Staab Attorney, Agent, or Firm-Wi1liam .l. Keating; Frederick W. Raring; .lay L. Seitchik  ABSTRACT The ipvention concerns connectors having an elongate spring body of elastomer or formed as a tubular spring about which a single layer wire coil is wound. The coil 7 Claims, 8 Drawing Figures This invention relates to electrical connectors and their method of manufacture. It is particularly but not exclusively concerned with connectors for connecting to or interconnecting lamina circuits such as are formed on printed circuit boards or substrates.
There is increasing need to effect releasable connection to circuit boards or substrates containing large numbers of integrated circuits and presenting large numbers of closely spaced connection points. It is important that such boards or substrates can readily be released from their interconnection within a greater circuit package for maintenance purposes. Conventional connectors have largely proved unsatisfactory in adaptation to the small sizes of connector and small contact pitch required.
It is an object of the present invention to provide a connector of a kind suitablefor manufacture in small sizes with small contact pitch and to provide an economic manner of manufacture for such a connector.
An electrical connector according to the present invention comprises an elongate spring body having a generally uniform cross-section, which is resiliently deformable transversely of its length and which has discrete conductive paths disposed in insulating spaced relationship around the body in which each path comprises a conductor wire of generally C-shaped turn form extending around part only of the circumferential periphery of and bonded to the body, exposed surface portions of the wire turns defining at least'a row of contact points distal from and extending along the spring body.
In one embodiment the wire of each C-shaped turn of at least one of the ends of theC-shape extends freely away from the spring body as a lead.
Suitably, the C-shaped turns extend around more than half of the circumferential periphery of the body and present diametrically opposite rows of contact points extending longitudinally of the body.
The spring body may be formed of elastomeric insulating material or for example it may be formed as a tubular spring of C-shaped cross-section. Such a spring may be ofmetal in which case the spring turns are insulated from the metal.
In a method of manufacture of an electrical connector according to the present invention, a single layer coil of conductor wire is wound around the spring body to extend longitudinally in closely spaced turns, the turns being bonded to the body and the coil being cut longitudinally of the body to separate adjacent turns which define the discrete conductive paths.
In a particular form of this method, the spring body is initially located beside a former body extending longitudinally of and projecting laterally from the spring body, the coil being wound in turns about the two bodies and cut longitudinally of the coil at turn portions around the former body, the former body being removed and wire portions extending from one or both ends of each of the separated turns. Suitably, a pair of connectors may be made simultaneously by disposing a former body between a pair of spring bodies, and winding the coil about the three bodies. The turns are then cut longitudinally of the former at locations between the spring bodies.
In order to reduce the offset effect due to the helical nature of coil turns, the spring body is suitably elastically deformed prior to winding the coil in the same sense as the lead of the coil, and is held in that condition until after the coil cutting operation when the deformation is relaxed. The coilturns are thus flattened.
The invention will now be described by way of example with reference to the accompanying partly diagrammatic drawings, in which:
FIG. I is a perspective view of a connector;
FIG. 2 is an end view of the connector of FIG. 1;
FIG. 3 is a fragmentary perspective view of a printed circuit board assembly including a connector according to FIGS. 1 and 2;
FIG. 4 is an enlarged fragmentary longitudinal section of part of the connector of FIGS. 1 and 2;
FIG. 5 is a fragmentary perspective view of a stage in the manufacture of a connector according to FIGS. I and 2;
FIG. 6 is a sectional view of a printed circuit edge connector embodying connectors according to FIGS. 1 and 2;
FIG. 7 is a fragmentary perspective view partially sectioned of a connector block assembly embodying the invention; and
FIG. 8 is an elevation of a spring body in relaxed, and deformed conditions established during manufacture of a connector according to the invention.
The connector of FIG. 1 comprises a tubular spring member 1 having a generally C-shaped cross-section with a longitudinally extending open seam 2 which may be closed by resilient deformation of the spring. The tubular spring is of metal but alternatively it could be of resilient insulating material or a body of elastomeric insulating material could be substituted for the tubular spring. A series of parallel wires 3 extend generally tangentially from the spring 1 and the wires terminate with arcuate portions 4 extending around and bonded to the tubular spring 1 in insulating spaced relationship. The wires are suitably insulated with a varnish type insulation and diametrically opposite parts of the arcuate portions 4 are cleaned of insulation on sides distal from the spring 1. The bare metal exposed is spot plated with contact metal such as gold or tin at 7 to provide rows 5 of contact points 6. The adhesive bonding material as seen in FIG. 4 secures the arcuate portions in insulating spaced relationship and allows flexure of the arcuate portions 4 concomitant with flexure of the tubular spring 1.
In use, as seen in FIG. 3, the connector of FIGS. 1 and 2 is clamped between opposed faces of adjacent circuit boards 9 with the tubular spring I compressively flexed between the boards. Groups of contact points 6 engage respective contacts of the circuit boards to effect desired interconnections between the upper and lower boards and to input or output circuits through the lead wires 3.
In order to manufacture a connector of this kind, as seen in FIG. 5, tubular springs l are suitably sprung onto opposite ends of a former 10 adapted to open the spring scams 2. The former is provided with longitudinal grooves II at opposite sides for wire cutting purposes as will be described. The external arcuate surfaces of the springs are coated with adhesive 8, FIG. 4, and a single layer coil of wire wound around the former in a series of closely spaced turns. After setting of the bonding adhesive, desired contact points 6, FIG. 4 are cleaned by a skimming or grinding process and the exposed Wire portions spot plated with a suitable contact metal 8, such as gold or tin. The wire coil is cut along the grooves 11 to separate the two connectors which are then removed from the former 10.
The wire ends 3 extend from both sides of the open seam 2 of each connector, and due to the expansion of these seams during the manufacture, the arcuate portions 4 of the wires extend around more than a semicircle when the spring is relaxed. The contact rows are suitably diametrically opposite in this condition. The wire ends 3 may be selectively removed or grouped into bundles according to the particular circuit connections required.
In the edge connector'of FIG. 6 a pair of connectors according to FIGS. 1 and 2 is positioned one on each side of a slot 12 in a housing 13. The springs l are arranged with arcuate portions projecting into the slot 12 with the rows of contact points 6 disposed to engage opposite sides of a printed circuit board 14. The wire ends 3 lead out from the housing for circuitry connection purposes.
It will be appreciated that the manufacture of the connector by coil winding techniques will normally result in diametrically opposite contact points 6 ofa conductor portion 4 being helically offset by half ofa pitch. Where fine wires are used on a close pitch and it is intended that a complementary contact surface of a printed circuit board will engage a plurality of contact points as a group, the half pitch offset is not material.
However, in situations where it is intended that the complementary printed circuit or substrate circuit will engage but a single contact point 6 then precautions must be taken to ensure selection of the appropriate contact points on diametrically opposite portions of the connector. In such situations it may be desirable to wind the arcuate portions 4 as flat turns or after winding the coil to displace marginal portions of the C- shaped spring bordering the open seam laterally in opposite directions in order to flatten the coil turns. This may suitably be effected by initially stressing the spring laterally in the sense of coil winding, in order elastically to deform the spring by an amount corresponding to the coil pitch and after winding the coil and bonding the turns, allowing the spring to relax from the stress to flatten the turns.
In an embodiment of the invention as shown in FIG. 7 the connector spring body is contained in an insulating housing comprising identical halves 16, 17 snapfitting together and about the spring body 1. Each housing half I6, 17 contain means, not shown, to engage ends of the spring body 1 at each side of the seam and arranged on closure of the two housing halves l6, 17 together to displace marginal portions of the spring body on each side of the seam relatively laterally in order to flatten the coil turns 4.
Each housing half I6, 17 has a groove-like recess 18, I9 receiving the spring body 1, and a plurality of passageways 20, 21 extending transversely of the recess and intersecting the recess generally tangentially of the spring body. Conductor wires 22 may be threaded into the passageways and clamped in position by resilient pressure of the spring body 1 which provides mechanical retention and contact pressure. Such an arrangement is applicable to flat flexible or tape cables, in which case a slot is provided for reception of the multiconductor cable in place of a plurality of passageways 22.
In FIG. 8 a spring body 1 of C-shaped section showing in broken lines 1 how it may be elastically deformed by lateral displacement on opposite sides of the seam prior to coil winding so that on relaxation afterwards, the helical coil turns are flattened. It will be appreciated that the broken line position represents a single turn helix of the same pitch and lead sense as the coil winding.
What is claimed is:
1. An electrical connector comprising an elongate spring body having a generally uniform cross-section, which is resiliently deformable transversely of its length and which has discrete conductive paths disposed in insulating spaced relationship around the body, said conductive paths comprising a conductor wire coil wound around said spring body and being disposed in closely uniformly spaced turns along said body, said conductor wire being bonded to said body and having a portion removed from each said turn thereby forming said discrete conductive paths, each path being of generally C-shaped turn form extending around part only of the circumferential periphery of the spring body, each path further comprising a lead portion extending freely away from said spring body, said lead portion being an integral part of the coil wound conductor wire, and exposed surface portions of the wire on each said turn defining at least a row of contact points distal from and extending along the spring body.
2. A connector as claimed in claim 1, in which the C- shaped turns extend around more than half of the circumferential periphery of the body and present diametrically opposite rows of contact points extending longitudinally of the spring body.
3. A connector as claimed in claim 2, in which the spring body is formed of elastomeric insulating material.
4. A connector as claimed in claim 2, in which the spring body is a tubular form of C-shaped cross-section.
points extending longitudinally of the spring body.
7. A connector as claimed in claim 2 in which the contact points are defined by spot depositions of metal plating on the exposed wire surface portions.
|Patente citada||Fecha de presentación||Fecha de publicación||Solicitante||Título|
|US2480142 *||21 Sep 1945||30 Ago 1949||Fred Lager||Electric contact|
|US2858515 *||12 Ago 1954||28 Oct 1958||Westinghouse Electric Corp||Electrical connector with resilient gripping means|
|US2980874 *||16 Sep 1957||18 Abr 1961||Tarbox John W||Electric winding|
|US3059211 *||24 May 1960||16 Oct 1962||Thomas & Betts Corp||Electrical connector for flat conductor carriers|
|US3188601 *||15 Ago 1962||8 Jun 1965||Litton Prec Products Inc||Electrical connector for tape-like electrical cable|
|US3221286 *||31 Jul 1961||30 Nov 1965||Sperry Rand Corp||Connector for printed circuit strip transmission line|
|US3307139 *||12 May 1965||28 Feb 1967||Lockheed Aircraft Corp||Flat cable connector|
|US3362005 *||26 Jun 1967||2 Ene 1968||Berg Electronics Inc||Hinge type connector for circuit boards|
|US3401369 *||7 Jun 1966||10 Sep 1968||Ibm||Connector|
|US3444503 *||7 Jun 1967||13 May 1969||Bell Telephone Labor Inc||Connector for electrical circuit board|
|US3533049 *||30 Oct 1967||6 Oct 1970||Mb Metals Ltd||Strip cable connector|
|US3818414 *||1 Mar 1972||18 Jun 1974||Plessey Handel Investment Ag||Electrical connectors|
|1||*||Dunman, Printed Circuit Connector IBM Technical Disclosure Bulletin, Vol. 7 No. 3, page 182, August 1964.|
|Patente citante||Fecha de presentación||Fecha de publicación||Solicitante||Título|
|US3951493 *||14 Ago 1974||20 Abr 1976||Methode Manufacturing Corporation||Flexible electrical connector and method of making same|
|US3985413 *||6 Sep 1974||12 Oct 1976||Amp Incorporated||Miniature electrical connector|
|US4820170 *||27 Ene 1988||11 Abr 1989||Amp Incorporated||Layered elastomeric connector and process for its manufacture|
|US4840569 *||27 Jun 1988||20 Jun 1989||Itt Corporation||High density rotary connector|
|US4897054 *||15 Mar 1989||30 Ene 1990||Amp Incorporated||Modular circuit board bussing connector|
|US5013248 *||30 Nov 1989||7 May 1991||Amp Incorporated||Multicircuit connector assembly|
|US5161981 *||10 Mar 1992||10 Nov 1992||Amp Incorporated||Foldable stacking connector|
|US5230632 *||19 Dic 1991||27 Jul 1993||International Business Machines Corporation||Dual element electrical contact and connector assembly utilizing same|
|US5299939 *||5 Mar 1992||5 Abr 1994||International Business Machines Corporation||Spring array connector|
|US5475921 *||4 Ago 1993||19 Dic 1995||The Wiremold Company||Method for making contact assembly|
|US5540594 *||29 Jun 1994||30 Jul 1996||The Whitaker Corporation||Elastomeric connector having increased compression range|
|US5823792 *||10 Mar 1997||20 Oct 1998||Molex Incorporated||Wire-wrap connector|
|US5999414 *||14 Mar 1997||7 Dic 1999||California Institute Of Technology||Physically separating printed circuit boards with a resilient, conductive contact|
|US7121837 *||14 Mar 2003||17 Oct 2006||Fujitsu Component Limited||Connector|
|US7654827 *||28 Ago 2007||2 Feb 2010||Japan Aviation Electronics Industry, Limited||Electrical connector having a space allowing an elastic connecting member to be escaped|
|US8127560||1 Jun 2007||6 Mar 2012||Carleton Life Support Systems, Inc.||Machined spring with integral retainer for closed cycle cryogenic coolers|
|US8378218||13 Nov 2009||19 Feb 2013||Carleton Life Support Systems, Inc.||Spring with multiple conducting coils|
|US8398443 *||18 Dic 2006||19 Mar 2013||Roche Diagnostics Operations, Inc.||Biological testing system and connector therefor|
|US20040005791 *||14 Mar 2003||8 Ene 2004||Fujitsu Component Limited||Connector|
|US20050014394 *||28 May 2004||20 Ene 2005||Infineon Technologies||Contact-connection device for electronic circuit units and production method|
|US20070249921 *||18 Dic 2006||25 Oct 2007||Henning Groll||Biological testing system|
|US20080057757 *||28 Ago 2007||6 Mar 2008||Japan Aviation Electronics Industry, Limited||Electrical connector having a space allowing an elastic connecting member to be escaped|
|US20080295523 *||1 Jun 2007||4 Dic 2008||Lane Daniel Dicken||Machined Spring With Integral Retainer For Closed Cycle Cryogenic Coolers|
|US20110114366 *||13 Nov 2009||19 May 2011||Lane Daniel Dicken||Spring with Multiple Conducting Coils|
|EP0036933A2 *||11 Feb 1981||7 Oct 1981||Bohdan Ulrich||Pluggable connector and its use in making a disconnectible electrical connection|
|WO1998040931A1 *||23 Feb 1998||17 Sep 1998||Molex Incorporated||Wire-wrap connector|
|Clasificación de EE.UU.||439/591, 439/787, 439/723, 439/66, 439/637|
|Clasificación internacional||H01R13/33, H01R12/16, H01R4/00, H01R13/00, H01R12/18, H01R43/00, H05K3/32|
|Clasificación cooperativa||H01R12/7082, H01R12/87, H01R13/33, H01R12/79|
|Clasificación europea||H01R12/79, H01R12/70E, H01R13/33|