Method of producing insulated terminals

• US 4,260,212 A
• Filed: 03/20/1979
• Issued: 04/07/1981
• Est. Priority Date: 03/20/1979
• Status: Expired due to Term

• Current Assignee: AMP Limited
• Original Assignee: AMP Limited
• Inventors: Ritchie, Leon T., Peppler, Michael S.
• Primary Examiner(s): McQuade, John
• Assistant Examiner(s): Brown, John S.
• Application Number:
  US06/022,248
• Time in Patent Office: 749 Days
• Field of Search: 339/97, 339/98, 339/99, 339/278 D, 427/289, 427/290, 427/292, 29/885
• US Class Current: 439/395
• CPC Class Codes: H01R 4/242 the contact members being plates having a single slot
• CPC Class Codes: H01R 4/2425 Flat plates, e.g. multi-layered flat plates
• CPC Class Codes: H01R 4/70 Insulation of connections end caps H01R4/22
• CPC Class Codes: Y10T 29/49224 with coating

Abstract

A method is disclosed for manufacturing insulated electrical terminals in which the insulation is uniformly distributed over all portions of the terminal which are to be insulated. The present invention concerns a treatment of the terminal between the stages in which the terminal is initially stamped and formed and the stage in which the coating of insulation material is applied to the terminal. In this intermediate stage the terminal is subjected to a treatment which reduces any sharp edges, burrs, or the like to have radii of curvature thereby allowing the insulation coating to uniformly flow on the entire surface of the terminal.

Claims

1. A method of producing insulated electrical terminals comprising the steps of:

stamping a continuous series of terminals from a flat web of metal stock, each said terminal having at least one insulation piercing portion;

subjecting all of said at least one insulation piercing portion of said terminal to an erroding medium which reduces all sharp edges of said portion to radii of curvature; and

applying a coating of insulative material to said portion of said terminal.

2. A method according to claim 1 wherein said erroding medium is chemical in nature.

3. A method according to claim 1 wherein said erroding medium is chemical etching.

4. A method according to claim 1 wherein said erroding medium is electropolishing.

5. A method according to claim 1 wherein said erroding medium is mechanical in nature.

6. A method according to claim 1 wherein said erroding medium includes subjecting at least said insulation piercing portion of each said terminal to a jet of abrasive material.

7. A method of producing an electrical terminal having an insulation piercing portion with a coating of insulation at least partially covering said portion, said method comprising the steps of:

forming a continuous series of terminals from a web of metal stock material, each said terminal having an insulation piercing portion;

reducing all sharp edges, projections, burrs and the like on at least said insulation piercing portion of said terminal to curved surfaces of transition; and

coating said insulating piercing portion of said terminal with a dielectric material.

8. A method according to claim 7 wherein:

said terminal is die formed.

9. A method according to claim 7 wherein said dielectric material is selected from the group consisting of vinyls, enamels, epoxys, urethane, polyesters, nylons, polypropylenes, acrylics, butyrates, and propionates.

10. A method according to claim 7 wherein said coating step is carried out by dipping, spraying, plating or electrodeposition.

11. A method according to claim 7 wherein said reducing is accomplished by chemical means.

12. A method according to claim 7 wherein said reducing is accomplished by mechanical means.

13. An improved, partially insulated electrical terminal having a coating of insulation at least partially covering an insulation piercing portion of said terminal, said terminal being produced by the steps of:

forming a continuous series of terminals from a web of metal stock material, each terminal having at least one insulation piercing portion;

reducing all sharp edges, projections, burrs and the like on said at least one portion of said terminal to curved surfaces of transition; and

coating said at least one portion of said terminal with a dielectric material.

14. The terminal according to claim 13 wherein:

said reduction of sharp edges, projections, burrs and the like is accomplished by chemical means.

15. The terminal according to claim 13 wherein:

said reduction of sharp edges, projections, burrs and the like is accomplished by mechanical means.

16. The terminal according to claim 13 wherein said dielectric material is selected from the group consisting of vinyls, enamels, epoxys, urethane, polyesters, nylons, polypropylenes, acrylics, butyrates, and propionates.

17. The terminal according to claim 13 wherein said coating step is carried out by dipping, spraying, plating or electrodeposition.