Contact for circuit board socket

• US 5,100,338 A
• Filed: 08/31/1990
• Issued: 03/31/1992
• Est. Priority Date: 08/31/1990
• Status: Expired due to Term

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Foxconn International, Inc (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Lu, Sidney
• Primary Examiner(s): MCGLYNN, JOSEPH
• Application Number:
  US07/575,799
• Time in Patent Office: 578 Days
• Field of Search: 439/296, 439/325, 439/326, 439/328, 439/629-637, 439/885
• US Class Current: 439/326
• CPC Class Codes: H01R 12/57 surface mounting terminals
• CPC Class Codes: H01R 12/83 connected with pivoting of printed circuits or like after insertion

Abstract

A contact for circuit board socket includes a planar conductor having an elongated base with oppositely spaced ends. A fulcrum leg is formed on one end of the base and has a cut-out space extending from outermost edge to the inside middle portion of the base so as to make the fulcrum leg more flexible. A contact leg is formed on the other end of the base and has a cut-out space extending lengthwise thereof between first and second parallel and spaced apart planar beam sections. The end of the base sections remote from the base are joined and the cut-out space extends to the middle portion of the base but does not communicate with that of the fulcrum leg. The conductor furthermore provides a stop means at the side of the contact leg, which cooperates with a similar stop means at the outer portion of the fulcrum leg to form a pair of stop means. The pair of stop means function to protect the contact from excess deformation, and to provide a holding portion to cooperate with a specific tool when the contact is inserted into a socket by the tool.

Claims

1. A contact for a circuit board socket comprising:

a planar conductor including an elongated base having spaced ends;

a fulcrum leg formed on and extending outwardly from one end of the base, and having a cut-out space extending from its outermost edge to the inside middle portion of the base so as to make the fulcrum leg more flexible;

a contact leg formed on and extending outwardly from the other end of the base, and having first and second parallel and spaced beam sections, a cut-out space extending between said first and second parallel and spaced apart planar beam sections, the ends of the beam sections remote from the base being joined and the cutout space extending to the middle portion of the base but not communicating with the cut-out space of the fulcrum leg.

2. The contact as described in claim 1, wherein a tail extends from the center of the bottom surface of the base to go through the main board for soldering.

3. The contact as described in claim 1 wherein a pair of barbs are provided projecting from said lateral]y spaced ends close to the bottom of the base.

4. The contact as described in claim 1, wherein the inner side of said fulcrum leg extends up at a 120 degree angle from the base, and the intersection portion constitutes a 120 degree arc.

5. The contact as described in claim 4, wherein said cut-out space in the fulcrum leg is similar in configuration to the inner portion of the fulcrum leg, and the fulcrum leg is configured to provide a semi-circular projection on the free end on which there is a fulcrum surface adapted to be engaged with the conductive area of the board.

6. The contact as described in claim 5, wherein said cut-out space divides the fulcrum leg into two spaced parts of which one is the inner portion and the other is the outer portion.

7. The contact as described in claim 1, wherein said contact leg is shaped as three interconnected sectional arc portions which extend up and away from the base slightly outwardly in the first section to near the same height as the top of the fulcrum leg, then bends inwardly in a range of from 50 to 60 degrees till reaching near four/tenths of its length in an inwardly horizontal direction in the second section, and extends horizontally in the third section.

8. The contact as described in claim 7, wherein said cut-out space of the contact leg between the adjacent edges of the two beam sections has a width substantially the same as the width of the beam sections.

9. The contact as described in claim 8, the end of said cut-out space of the contact leg lies same vertical plane as the innermost end of said cut-out space in the base.

10. The contact as described in claim 1 wherein the base extends laterally outwardly for a distance beyond said contact leg, and said cut-out space in the base also extends laterally outwardly to an outermost end to enhance the elasticity of the contact leg.

11. The contact as described in claim 10, wherein a stop means is positioned at the outermost end of the base beside the contact leg, and extends up to just below the upper end of the fulcrum leg, the inward edge surface of said stop means lying generally in alignment with the outermost end of the cut-out space of the contact leg in the base.

12. A contact for a circuit board socket adapted to be inserted into the socket from above the socket by an appropriate tool, comprising a base having opposite end portions;

a contact leg and a fulcrum leg extending integrally from the base; and

a pair of stop means formed on said opposite end portions of the base and extending from the base in the same direction as said contact leg and said fulcrum leg and in the same plane therewith whereby destructive flexure of said contact leg and fulcrum leg is prevented by said stop means, said pair of stop means functioning also as a holding portion to cooperate with the appropriate tool when the contact is inserted into the socket from above by said tool.

13. In combination, the contact described in claim 12, and a carrier strip connected to said contact wherein the connection of the carrier strip and the contact occurs at the top of the contact leg.

14. In combination, the contact as described in claim 12, and a carrier strip connected to said contact wherein the connection of the carrier strip and the contact occurs at the top of one or more of said stop means.

15. In combination, a plurality of contacts as described in claim 12, and a carrier strip connected to said contacts, wherein an auxiliary horizontal connection strip is provided connecting adjacent stop means of adjacent contacts.

16. The contact as described in claim 12, wherein the contact leg and the fulcrum leg can be elastically flexed through a range of angles in relation to said stop means in order to accommodate the different angle sockets.