Environmental connector

• US 5,485,673 A
• Filed: 06/16/1994
• Issued: 01/23/1996
• Est. Priority Date: 06/16/1994
• Status: Expired due to Term

• Current Assignee: Switchcraft Incorporated (Heico Corporation)
• Original Assignee: Switchcraft Incorporated (Heico Corporation)
• Inventors: Lau, Frederick L.
• Primary Examiner(s): Hughes, S. Thomas
• Application Number:
  US08/260,595
• Time in Patent Office: 586 Days
• Field of Search: 29/883, 29/527.3, 439/589, 439/587, 439/271, 439/275, 439/736, 439/278, 264/259, 264/267, 264/274, 264/275
• US Class Current: 29/883
• CPC Class Codes: H01R 13/5221 having cable sealing means
• CPC Class Codes: H01R 43/24 Assembling by moulding on contact members
• CPC Class Codes: Y10T 29/4922 with molding of insulation

Abstract

An environmental connector formed by insert molding a thermoplastic rubber insert into a plastic cylindrical housing having an external shoulder adjacent to an exit aperture for the thermoplastic rubber to flow to an annular void in the cavity of the mold. In such manner, an annular ring such as a gasket or o-ring is formed by the insert molding process, and is connected as one piece with the thermoplastic rubber insert formed in the internal chamber of the housing. The housing is made of polypropylene and the thermoplastic rubber is Santoprene so the two materials stick together to hold the annular ring snugly against the shoulder. The insert of the female connector has a concentric opening to receive the housing of the male connector, and the concentric opening terminates in thin protrusion that is compressible to from an inner seal to prevent the ingress of moisture into the connectors.

Claims

1. A method of making an electrical connector, comprising the steps of:

forming a plastic housing having an axis and being formed with an axial chamber extending between opposing open ends, said housing having an external annular shoulder and an aperture adjacent to said shoulder;

positioning said housing in a cavity of an insertion mold having at least one post extending axially through said chamber of said housing, said cavity having an annular void adjacent to said shoulder;

injecting thermoplastic rubber into said chamber of said housing to form a rubber insert of predetermined shape within said housing and around said at least said one post, and to cause said thermoplastic rubber to flow out of said aperture and around said housing in said annular void to form an annular ring against said shoulder wherein said insert and said ring are interconnected as one piece;

removing said housing and insert from said cavity and away from said at least one post to form at least one axial bore through said insert within said chamber in the space vacated by said at least one post; and

inserting at least one conductive contact into said bore.

2. The method recite in claim 1 wherein said plastic is polypropylene.

3. The method recited in claim 1 wherein said forming step comprises a step of forming an injection port in said housing, and said injecting step comprises a step of injecting said thermoplastic rubber into said chamber through said injection port.

4. The method recited in claim 1 wherein said ring comprises an O-ring for said connector.

5. The method recited in claim 1 wherein said housing comprises an outer annular flange forming said shoulder, and said ring comprises a gasket against said flange.

6. The method recited in claim 1 wherein said insertion mold has a plurality of posts to form a plurality of bores through said insert, and said method further comprises a step of inserting a plurality of conductive contacts in a contact holder and inserting the contact holder into said chamber through one of said open ends to cause said plurality of contacts to be received in corresponding ones of said bores in said insert.

7. The method recite in claim 6 further comprising steps of attaching electrical wires from a cable to said contacts, and attaching a cable clamp to said housing.

8. The method recited in claim 2 further comprising a step of selecting a thermoplastic rubber that sticks to said polypropylene housing.

9. A method of making an electrical connector, comprising the steps of:

forming a substantially tubular polypropylene housing having an elongated hollow chamber extending between opposing open ends, said housing having an external annular flange and an aperture adjacent to said flange;

positioning said housing in a cavity of an insertion mold having a predetermined plurality of posts extending axially through said chamber of said housing, said cavity having an annular void adjacent to said flange on the outside of said housing;

injecting thermoplastic rubber into said chamber of said housing to form a rubber insert of predetermined shape within said housing around said posts, and to cause said thermoplastic rubber to flow from said chamber through said aperture and around said housing in said annular void to form an annular gasket against said flange wherein said insert and said gasket are interconnected as one piece;

removing said housing and insert from said cavity and away from said plurality of posts to form a plurality of axial bores through said insert in the space vacated by said plurality of posts; and

inserting a plurality of conductive contacts into said plurality of bores, respectively.