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Publication numberUS3281751 A
Publication typeGrant
Publication dateOct 25, 1966
Filing dateAug 30, 1963
Priority dateAug 30, 1963
Publication numberUS 3281751 A, US 3281751A, US-A-3281751, US3281751 A, US3281751A
InventorsBlair Raymond H
Original AssigneeBlair Raymond H
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Spring connector for printed circuit board
US 3281751 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)



United States Patent O Filed Aug. 30, 1963, Ser. No. 305397 2 Claims. (CI. 339-17) The ;invention described herein may be manufactured and used by or for the Government of the United States of America tor .governmental purposes without the payment of any royalties thereon or therefor.

The present invention relates to a means for connecting electrical and electrical-mechanical Components to ojrcuit boards or electric cirouitry and more particularly to a coiled spring electrical connecter.

In the field of .connecting e lectnical-mechanical components to ci-rou-it boards or electrical -circuit ry, it has been the general practice to employ a coiled spring housed wi-thin the circuit board and a plug h-oused with-in the component so that the plug may 'be .inserted into the coiled .spring ;in order to make an electrical connection. Vario-us types of spring clips have been soldered to the circuit board and are insertable in a socket housed with-in the component. Also vanious types of complex cab ling systems have been used to connect a circuit board to a c-omponent. Although such devices have .served the purpose, they have not proved entirely satisfactory under all conditions of service for the reasons that considerable difficulty has been experienced in repair-ing defective connections. It has been found that the sub-miniature connectors required too much space for engaging, disengaging and the cablin g. Prior devices have also required complex cab-ling systems, have been very expensive and not too reli-able in operation.

The general purpose of this invention is to provide a coiled spring electrical connector which embraces all the advantages of similarly employed electrical connectors and possesses none of the -aforedescribed disadvantages. To attain this purpose, the present inventi-on contemplates a unique coiled spring electrica l connector insertable by a special tool into a circuit board having an eyelet therein and then into an insulated socket housed within the base or side of a component. The coiled spring electrical connector provides a method of connecting and interconnecting a number of elements such that much -less space is required than by using standard connectors and cabling. In the instant i-nve-nt-ion, complex cabiing systems are eliminated, cost is reduced and high reli-ability is obtained.

An object of the present invention is the provision of a new and improved e lectrical oonnector.

Another object of this invention 'is to provide a new and improved coiled spring e lectrical conneotor suitable for use in printed ci rcuit boards.

A further object of the invention is the provision of a reliable, flexible and tight-fitt ing electrical connection.

Other objects and features of the invention will become apparent -as the disclosure is made in the following detailed description of a preferred embodiment of the invention as illustrated in the acconpanying sheet of drawing tin which:

FIG. 1 is `a cross-sectional view of a circuit board and the component showing a coiled spring electrica-l connector being inserted by a tool into both elements, and another connecter in the inserted position; and

FIG. 2 is another embodiment of the invention in which a coi-led .spring connector is shown c-onnecting two printed circuit boards.

3,28L751 Patented Oct. 25, 1966 Referring now to the drawing, wherein like reference characters designate like or correspond-ing parts throughout the views, there is shown in FIG. 1 a oircuit board 1 having a printed circuit -on one or two .sides thereof. Spaced adjacent t-o the circuit board l is a Component 2. A coiled spring electrica-l connector 3 connec-ts the circuit board 1 to the insulated socket 5 in bas-e 8 of Component 2. Eyelets 4 are inserted -in openings 13 located in the cirouit board 1. Sockets 5 having apertures therein oi approximate ly the same diameter as apertures in the eyelets are inserted through -openin-gs -14 in the base 8. These sockets can be he-rmeti-cally sealed in the base or insulated from the base, if .so desired. The coiled spring connector 3 has a normal diameter which is slightly larger than the diameter of the apertures of the eye-lets 4 and sockets 5. Wi-res 6 are Wrapped around the pins of sockets S to complete the electrical circuit. The wires are connected to electrica-l and electrical-mechanical components such as resistors, capacitors, re lays, accelerometers, timers and switches (not shown). Spacer'; 15 separate the circuit board 1 from the base 8. A too'i for inse-rting and removing the coil spring Connector 3 comprises a knurled knob 9, rod 10 and cy lindrical member 11 rotatab'le on the rod. At one end of the ro d 10 is a -shaped portion 17 for grasping one end of :the coiled spring connect-or 3. The r od 10 is inserted into the cylindri-cal 'member 11 which has a hole 16 therein for receiving the rod 10. The cylindr--c-al member 11 has au extension 12 thereon for grasping the other end of the coil spring connector 3.

The coiled spring electrical connect-or is connected and dis-connected in the following manner. The rod in nserted into the coiled spring 3 and one end of the coiled spring Connector 3 is attached to the U-shaped end 17 of the rod 10. The other end of the coiled spring oonnector 3 is attached to the extension 12 of the cy-lindrical member 11. The cy lind-rical member 1-1 is rotated with respect to the knob 9 and rod 10 thereby twisting the coils tighter and reducing the diameter of the coiled spring Connector 3. While the coiled spring Connector is in this reduced condition, it is inserted through the eyelet 4 in the -ci rcuit board l and then into the -insulated socket 5 in base 8. The cylindrieal member 11 is rotated back to its initial position and disconnected from the coiled spring connecter, and the rod 10 is also dis-connected from the `coiled spring connecter thereby allowing the coil to expand and flexibly connect the circuit board 1 to the socket 5 in base 8. An electrical circuit is now completed between the c-ircuit board Il, eye-let 4, coiled spning connector 3, insulated socket 5 and wire 6. Thus it can be seen that there is shown on FIG. 1 a tool for inserting a coiled .spring connect-or and a coiled spring connector in the connecting position afte-r the tool has been removed. If it is desired to (remove the coiled spring connector, the tool is connected to both ends of the coiled spring connector 3, rotated so that the diameter of the connect-or s reduced, and then :the connector is with drawn from the socket 5 and the eyelet 4.

It is to be understood that the coil diameter and the wire diameter of the c-oiled spring connecter may be varied depending on the current to be carried. Also, the capaoity of the spring connection can be increased by inserting an electrical conducting exible core inside the coil after the coil has been inserted into the circuit board and the base. F-urther, the elements t-o be connected by the coiled spring connector can be varied t-o mee-t the function desired. For example, FIG. 2 shows a coiled spring electnical connecter 3 in electrically connecting engagement with a circuit board 18 and a circuit board 19, each board having a printed circuit thereon. The coiled spring connector or a plurali-ty of them can be used to interconnect any number of printed eireuit boards or printed circuit boards in co'mbinati-on With a component. Each circuit board can be constructed With a pri-nted circui-t on each side -or inte-rnally thereof, if desired.

I-t can be seen that a unique coi led spring eleetrical connecter has been provided :to electrically connect a c-ircuit board to -a Component. A coiled spring electrical connect or has been provided that makes :a :flexib-ie, t-ightfitting electrical connection between a circuit board and a oomponen-t and is reiiabie in operation.

Obviously many modifications and variations of :the present inve-ntion are possible in the light of the above teachings. It is therefore -to be understood, that within the .scope of the appended claims, the inven-ti on may be practiced otherwise th-an as specificai ly described.

What is claimed is: 1. An electricai interconnect-ing device for interoonnecting an insulatin g board having a -prnted circuit thereon with at least one terminal to the base of an eleetrical component having at least one terminal t-hereon, said c-onnectin-g device comprising:

a tubular conductive eyel et extending through said board and in electricaily conducting engagement With a terminal of said printed circuit,

an -insuiated conductiv-e socket closed at -one end located in the base of said component and in electr-icai ly conducting engagement with a terminal thereon,

and an electri-oally conductive coiled spring having a normal coi-1 diameter throughout its .length slightly lar-ger than the internal diameters of said eyelet and References Cited by the Examiner UNITED STATES PATENTS 1,023,270 4/1912 Nungesser 339-256 1,334,040 3/1920 Lee 339-252 2,752,580 6/1956 Shewrnaker 339-17 2,792,560 5/1957 Bol lmeier 339--252 3,022,369 2/ 1962 Rayburn 339-17 X FOREIGN PATENTS 227,1 01 12/ 1925 Great Britain.

OTHER REFERENCES i Kennedy et ai.: I.B.M. Technical Disciosure B-ul-letin. June 1963, pages 36 and 37.

EDWARD C. ALLEN, Pr'mary Exam'ner- ALFRED S. TRASK, Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1023270 *Jun 9, 1911Apr 16, 1912Nungesser Electric Battery CompanySpiral coil for fastening wire-terminals.
US1334040 *Jun 12, 1918Mar 16, 1920North East Electric CoElectric connection
US2752580 *Apr 27, 1953Jun 26, 1956Charles A ShewmakerPrinted circuit board and terminal connections
US2792560 *Mar 23, 1953May 14, 1957Minnesota Mining & MfgWire-connector
US3022369 *Jun 16, 1960Feb 20, 1962Illinois Tool WorksWire connector for printed circuit board or the like
GB227101A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3327041 *Apr 30, 1964Jun 20, 1967Sylvania Electric ProdRadiant heat reflecting device
US3571566 *Aug 27, 1969Mar 23, 1971Mc Graw Edison CoElectric resistance heater with a tension coil spring
US3732379 *Mar 23, 1971May 8, 1973Bell Telephone Labor IncDistribution board
US4340264 *Apr 6, 1981Jul 20, 1982The Perkin-Elmer CorporationManufacture of glass base lamp
US4574331 *May 31, 1983Mar 4, 1986Trw Inc.Multi-element circuit construction
US4857857 *Nov 23, 1988Aug 15, 1989The Research Foundation Of State University Of New YorkElectrode catheter testing device
US5820014 *Jan 11, 1996Oct 13, 1998Form Factor, Inc.Solder preforms
US5994152 *Jan 24, 1997Nov 30, 1999Formfactor, Inc.Fabricating interconnects and tips using sacrificial substrates
US6274823Oct 21, 1996Aug 14, 2001Formfactor, Inc.Interconnection substrates with resilient contact structures on both sides
US7517226 *Jul 26, 2007Apr 14, 2009Eli KawamHelical contact connector system
US7601039Jul 11, 2006Oct 13, 2009Formfactor, Inc.Microelectronic contact structure and method of making same
US8033838Oct 12, 2009Oct 11, 2011Formfactor, Inc.Microelectronic contact structure
US8373428Aug 4, 2009Feb 12, 2013Formfactor, Inc.Probe card assembly and kit, and methods of making same
US20090029580 *Jul 26, 2007Jan 29, 2009Northrop Grumman Systems CorporationHelical contact connector system
DE2813160A1 *Mar 25, 1978Oct 12, 1978Robotron Veb KThrough hole contact for multi-layer circuit cards - uses solderable coil round insert plugs to improve solder coupling
WO1990008405A1 *Jan 2, 1990Jul 26, 1990Raychem CorporationAssembly of electrically interconnected articles
U.S. Classification439/75, 338/316, 29/605, 439/840, 219/541
International ClassificationH01R12/18, H01R13/02, H01R12/00, H01R13/193
Cooperative ClassificationH01R9/091, H01R13/193
European ClassificationH01R9/09B, H01R13/193