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Restrained Spring Electrical Connector

IP.com Disclosure Number: IPCOM000097714D
Original Publication Date: 1961-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

McConnell, WR: AUTHOR [+2]

Abstract

The restrained spring electrical connector provides substantially equal contact forces. It is advantageous for compact or miniaturized connectors and for use in a long row of contacts receiving a printed circuit board.

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Restrained Spring Electrical Connector

The restrained spring electrical connector provides substantially equal contact forces. It is advantageous for compact or miniaturized connectors and for use in a long row of contacts receiving a printed circuit board.

A printed circuit card I has terminal contact strips 2 on either side. Card 1 is inserted between a pair of contact springs 3 in a plug unit 4. The upper ends of the springs are restrained by a pair of stop bars 5. In assembly, springs 3 are bent over to a point beyond the yield point and then assembled into the plug and bent back and the bars 5 inserted.

A spring material is used having a force-deflection curve in which the portion of the curve beyond the yield point is flat. When the springs 3 are overbent, an operating range for the insertion and removal of the cards is provided as indicated. Various springs overbent to various points on the flat part of the F-X curve have different operating ranges along the X coordinate (dotted lines), but each spring has the same initial and final F coordinates.

The advantages of this spring connector are: (1) Uniformity of force is assured for all springs. (2) The need for close tolerances in the manufacture of the molding and springs to achieve uniform spring force

is removed. (3) The amount of insertion force needed to insert the card is reduced, particularly in a long row of springs. (4) The occurrence of short circuits in double-sided sockets caused by opposing spri...