Grounded metal coupling

• US 4,738,628 A
• Filed: 09/29/1986
• Issued: 04/19/1988
• Est. Priority Date: 09/29/1986
• Status: Expired due to Fees

• Current Assignee: Cooper Industries, Inc. (Eaton Corporation PLC.)
• Original Assignee: Cooper Industries (Eaton Corporation PLC.)
• Inventors: Rees, David G.
• Primary Examiner(s): Weidenfeld, Gil
• Assistant Examiner(s): Pirlot, David
• Application Number:
  US06/912,710
• Time in Patent Office: 568 Days
• Field of Search: 339/14, 339/263 R, 339/5, 339/6, 339/8, 339/143, 339/136, 339/252 R, 339/252 S, 339/253 R, 339/253 S, 339/254 R, 339/254 M, 339/88, 339/89, 339/90, 339/59, 339/61 , 339/91 B
• US Class Current: 439/95
• CPC Class Codes: H01R 13/648 Protective earth or shield arrangements on coupling devices , e.g. anti-static shielding coaxially arranged shields H01R24/38

Abstract

A grounding mechanism for an electrical connector having a metal generally U-shaped spring contact mounted on a cylindrical rubber or neoprene connector body which is connected directly to the internal ground contact within the connector body. Resilient tips on the body act to bias the free ends of the spring contact outwardly. The free ends of the spring contact stay in contact with a rotatable collar mounted over the body due to the compressed nature of the pre-formed metal spring contact, as well as the radially outward force of the resilient connector body tips acting on the free ends of the spring contact.

Claims

1. An electrical connector assembly comprising:

a cylindrical body carrying at least one power lead and a ground lead, said body having a mounting area provided on a portion of the outer periphery of said cylindrical body, the mounting area exposing a portion of the ground lead and having at least one resilient tip extending radially therefrom;

an electrically conducting spring contact connected to the exposed portion of the ground lead within the mounting area of said body, said spring contact having at least one free end adjacent the resilient body tip extending radially outside the outer periphery of said body;

a generally cylindrical collar positioned about said body and covering said spring contact having a relatively smooth cylindrical inner surface, said spring contact having its free end radially depressed to allow said collar to fit about said body, the free end of said spring contact depressing the resilient tip of said body such that the resilient tip is continually biasing the free end of said spring contact in a radially outward direction to maintain contact between the free end of said spring contact and the inner cylindrical surface of said collar; and

roller bearing means positioned between said body and collar providing for relative rotational movement between said collar and body.

2. An electrical connector assembly according to claim 1, wherein the free end of said spring contact further comprises a half-moon shaped extension extending therefrom, said extension having a concave portion and a convex surface with the half-moon extension opening radially inward toward the said body, the resilient tip of said body contacting the concave portion of the extension and biasing the convex surface of the extension into contact with the inner cylindrical surface of said collar.

3. An electrical connector assembly according to claim 1, wherein said roller bearing means further comprises:

an annular sleeve positioned about the outer periphery of said body, said sleeve having an annular groove extending about said cylindrical body;

said collar having an annular internal peripheral groove formed on its inner cylindrical surface and a radial bore extending from the internal groove to the outer peripheral surface of said collar, the collar positionable about said body such that the annular collar groove is positioned radially adjacent the annular sleeve groove to form a generally cylindrical ball bearing path between said sleeve and collar; and

a plurality of ball bearings inserted through the collar bore into the ball bearing path providing for relative rotational movement between said collar and said body.

4. An electrical connector assembly having at least one power lead and one ground lead connected to external electrical power and grounding sources, comprises:

an insulating cylindrical body carrying at least one socket contact and one plug contact adapted for engagement with a plug contact and socket contact, respectively, of a second body between which two bodies relative longitudinal movement may establish and interrupt a connection between said contacts, said body having a mounting area provided on a portion of the outer periphery of said body, the mounting area exposing a portion of the ground lead and having at least one resilient tip extending radially therefrom;

an electrically conducting spring contact mounted within the mounting area of said body and electrically connected to the exposed ground lead of said connector, said spring contact having at least one free end positionable radially above the resilient tip of said body, the free end of said spring contact normally extending radially outside the outer periphery of said body; and

a generally cylindrical collar positionable about said body covering said spring contact and having a relatively smooth inner cylindrical surface, said collar adapted for rotational movement about said body to provide for connection between said two bodies, said spring contact having its free end radially depressed to allow said collar to fit about said body, the free end of said spring contact depressing the resilient tip of said body such that the free end is continually biased in a radially outward direction to maintain contact with the inner cylindrical surface of said collar so that an electrical circuit is maintained at all times between said collar and the ground lead within the electrical connector.

5. An electrical connector assembly according to claim 4, wherein the spring contact further comprises:

a half-moon shaped extension extending from the free end of said spring contact, said half-moon extension having an outwardly facing convex surface with said half-moon extension opening radially inward toward the resilient tip of said body and the outwardly facing convex surface of the extension normally extending radially outside the outer periphery of said body,

said half-moon shaped extension of the free end of said spring contact being radially depressed into said contact with the resilient tip of said body upon insertion of said collar about said body such that the convex surface of said extension is contacting the inner cylindrical surface of said collar, said half-moon shaped extension being continually biased by said resilient tip in a radially outward direction to maintain contact with the inner cylindrical surface of said collar.

6. An improved connector assembly of the type having a cylindrical body carrying at least one power lead and a ground lead connected to external electrical power and grounding sources, a generally cylindrical collar positioned about said body having a relatively smooth inner cylindrical surface, the collar adapted for rotational movement about said body to provide for mechanical and electrical connection of the body to another body, wherein the improvement comprises:

the body having a mounting area provided on a portion of the outer periphery of said body, the mounting area exposing a portion of the ground lead and having at least one resilient tip extending radially outward therefrom;

an electrically conducting spring contact mounted within the mounting area of said body and being electrically connected to the exposed ground lead of the body, said spring contact having at least one free end positionable radially outside the resilient tip of said body, the free end of said spring contact normally extending radially outside the outer periphery of said body when the collar is not positioned about said body; and

the free end of said spring contact is adapted to be radially depressed towards said body to allow the collar to fit about said body, the free end of said spring contact depressing the resilient tip of said body such that the free end is continually biased in an outwardly radial direction by the resilient tip towards the inner cylindrical surface of the collar to maintain contact between said spring contact and the collar such that an electrical grounding circuit is maintained at all times between the collar and the ground lead of the electrical connector.