Coaxial cable connector assembly and method for making

• US 4,761,146 A
• Filed: 04/22/1987
• Issued: 08/02/1988
• Est. Priority Date: 04/22/1987
• Status: Expired due to Fees

• Current Assignee: SPM Instruments US Incorporated
• Original Assignee: SPM Instruments US Incorporated
• Inventors: Sohoel, Eivind O.
• Primary Examiner(s): Pirlot, David
• Application Number:
  US07/041,152
• Time in Patent Office: 468 Days
• Field of Search: 29/861, 29/748, 29/754, 29/828, 29/854, 29/857, 29/862, 29/882, 29/867, 439/322, 439/578, 439/579, 439/580, 439/581, 439/582, 439/583, 439/584, 439/585, 439/610, 439/393, 439/394
• US Class Current: 439/584
• CPC Class Codes: H01R 13/52 Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
• CPC Class Codes: H01R 9/0521 Connection to outer conductor by action of a nut

Abstract

A connector assembly for terminating a shielded coaxial cable includes a female connector element having a bore containing an electrical contact and a male connector assembly including a plurality of individual connecting members carried by an end portion of the cable and received within the bore. The connecting members include a radially expandable shield connector affixed to the end of the cable, an annular thrust washer received on the cable for expanding the shield connector, an elastomeric O-ring seal received on the cable adjacent the thrust washer, a cylindrical plunger slidably received on the cable for engaging the O-ring seal and a cap nut threadably engaged with the female connector for urging the plunger in an axial direction and toward the O-ring seal whereby to urge the central conductor within the cable into electrical contacting engagement with the electrical contact, radially expand the shield connector within the bore and radially expand the O-ring into sealing engagement with the wall of the bore and the outer jacket of the cable in response to force applied to the O-ring seal by the plunger when the cap nut is rotated in a tightening direction relative to the female connector. A method for making the connector assembly is also disclosed.

Claims

1. A connector assembly for terminating a coaxial cable having a central conductor, an annular inner insulation layer in coaxial surrounding engagement with the central conductor, an annular conducting shield in coaxial surrounding engagement with the inner insulation layer, and an outer insulation jacket coaxially surrounding the conducting shield, said connector assembly comprising a female connector having an outwardly open cylindrical connector bore for receiving an end portion of the cable and electrical contact means disposed within and centrally of said connector bore for engagement with the central conductor, and a male connector assembly including a radially expandable shield connector having a cylindrical sleeve portion, means for attaching the shield connector in fixed position to the end portion of the coaxial cable with said sleeve portion in coaxial surrounding engagement with the inner insulation layer between the inner insulation layer and said conducting shield and in electrically conducting engagement with the conducting shield and including a thread on the interior of said sleeve portion for threadable engagement with the inner insulation layer, thrust means for radially expanding said shield connector within said connector bore in response to force applied in an axial direction to said thrust means to establish electrical continuity between said conducting shield and said female connector, resilient deformable annular sealing means for positioning in coaxial surrounding engagement with the cable within said connector bore, said sealing means being radially expandable into sealing engagement with the cable and said connector bore in response to force applied in an axial direction to said sealing means, and means for applying force in said axial direction to said sealing means and said thrust means and urging the central conductor into engagement with said contact means.

2. A connector assembly for terminating a coaxial cable as set forth in claim 1 wherein said thrust means comprises an annular member coaxially surrounding an associated portion of said cable and said shield connector and said annular member have coengageable cam surfaces thereon.

3. A connector assembly for terminating a coaxial cable as set forth in claim 1 wherein said contact comprises a hollow pin for penetrating said inner insulation layer and receiving an end portion of the central conductor therein in response to said force.

4. A connector assembly for terminating a coaxial cable as set forth in claim 1 wherein said shield connector includes an integral diametrically enlarged head portion and a plurality of equiangularly spaced radially expandable fingers projecting from said head portion in radially spaced relation to said sleeve portion.

5. A connector assembly for terminating a coaxial cable as set forth in claim 4 wherein said thrust means comprises an annular thrust washer coaxially surrounding an associated portion of said cable and said fingers and said thrust washer have coengageable cam surfaces thereon.

6. A connector assembly for terminating a coaxial cable as set forth in claim 1 wherein said force applying means comprises a nut received on said cable and threadably engaged with said female connector.

7. A connector assembly for terminating a coaxial cable as set forth in claim 6 wherein said force applying means further includes a plunger slidably received on said cable between said nut and said sealing means.

8. A connector assembly for terminating a coaxial cable as set forth in claim 7 wherein said sealing means comprises an elastomeric O-ring.

9. A connector assembly for terminating a coaxial cable having a central conductor, an annular inner insulation layer in coaxial surrounding engagement with the conductor, an annular conducting shield in coaxial surrounding engagement with the inner insulation layer, and an outer insulation jacket coaxially surrounding the conducting shield, said connector assembly comprising a female connector having an outwardly open cylindrical connector bore for receiving an end portion of the cable and having an electrical contact disposed within and centrally of said connector bore, and a male connector assembly including a radially expandable shield connector having a cylindrical sleeve portion including a sleeve bore extending coaxially therethrough for receiving an associated end portion of the inner insulation layer therein, said sleeve portion coaxially surrounding the inner insulation layer and being disposed between the inner insulation layer and said cunducting shield, said shield connector having a diametrically enlarged head portion integrally connected to an associated end of said sleeve portion and a plurality of equiangularly spaced fingers projecting from said head portion in radially outwardly spaced relation to said sleeve portion, means for attaching the shield connector in fixed position to the end portion of the coaxial cable in electrically conducting engagement with the conducting shield and including an internal thread formed on said shield connector within said sleeve bore for engaging an end portion of said coaxial cable, thrust means including a thrust washer coaxially surrounding an associated portion of the coaxial cable for radially expanding said shield connector within said connector bore in response to force applied in an axial direction to said thrust means to establish electrical continuity between said conducting shield and said female connector, said fingers and said thrust washer having coengageable cam surfaces thereon, resilient deformable annular sealing means for positioning in coaxial surrounding engagement with the coaxial cable within said connector bore, said sealing means being radially expandable into sealing engagement with the coaxial cable and said connector bore in response to force applied in an axial direction to said sealing means, and means for applying force in said axial direction to said sealing means and said thrust means and urging the conductor into engagement with said electrical contact.

10. A connector assembly for terminating a coaxial cable as set forth in claim 9 wherein said force applying means comprises a nut threadably engaged with said female connector.

11. A connector assembly for terminating a coaxial cable as set forth in claim 10 wherein said force applying means includes a generally cylindrical plunger slidably received on the coaxial cable between said nut and said sealing means.

12. A connector assembly for terminating a coaxial cable as set forth in claim 11 wherein said sealing means comprises an elastomeric O-ring.

13. A method for terminating a coaxial cable having a central conductor, an annular inner insulation layer in coaxial surrounding engagement with the central conductor, an annular conducting shield in coaxial surrounding engagement with the inner insulation layer, and an outer insulation jacket coaxially surrounding the conducting shield, said method comprising the steps of providing a female connector having an outwardly open cylindrical connector bore for receiving an end portion of the cable and electrical contact means disposed within and centrally of said connector bore, providing a rotary hand tool having a cylindrical end portion, coaxially rotating the tool relative to the end portion of the cable while simultaneously applying force to the tool in an axial direction and toward the cable to radially expand an end portion of said conducting shield and said outer insulation jacket to form a coaxial annular space between said conducting shield and said inner insulation layer, providing a radially expandable shield connector having a cylindrical sleeve portion generally corresponding to the cylindrical end portion of said rotary hand tool and means for expanding said shield connector within said connector bore in response to force applied in an axial direction to said expanding means, forcibly inserting said cylindrical sleeve portion into said annular space, attaching said shield connector in fixed position to the end portion of said coaxial cable, positioning an annular elastomeric sealing member in coaxial surrounding relation to the expanded end portion of said outer insulation jacket associated with said sleeve portion and generally adjacent said expanding means, positioning within said connector bore the end portion of said coaxial cable with said shield connector, said expanding means and said sealing member thereon, and applying force in an axial direction and toward said coaxial cable to said sealing member to urge said central conductor into engagement with said electrical contact means, expand said shield connector into engagement with the wall of said connector bore and radially expand said elastomeric sealing member into sealing engagement with said coaxial cable and the wall of said connector bore.

14. A method for terminating a coaxial cable as set forth in claim 13 wherein the step of applying force is further characterized as threading a nut onto said female connector.

15. A method for terminating a coaxial cable as set forth in claim 13 including the additional step of stripping an end portion of the outer insulation jacket from the coaxial cable to expose an end portion of the conducting shield and turning the exposed end portion of the conducting shield back on the cable to coaxially surround the end portion of the outer insulation jacket, the latter steps to be performed before the step of attaching said shield connector.

16. A method for terminating a coaxial cable having a central conductor, an annular inner insulation layer in coaxial surrounding engagement with the central conductor, an annular conducting shield in coaxial surrounding engagement with the inner insulation layer, and an outer insulation jacket coaxially surrounding the conducting shield, said method comprising the steps of stripping an end portion of the outer insulation jacket from the coaxial cable to expose an end portion of the conducting shield, turning the exposed end portion of the conducting shield back on the cable to coaxially surround the end portion of the outer insulation jacket, providing a female connector having an outwardly open cylindrical connector bore for receiving an end portion of the cable and electrical contact means disposed within and centrally of said connector bore, radially expanding an end portion of said conducting shield and said outer insulation jacket to form a coaxial annular space between said conducting shield and said inner insulation layer, providing a radially expandable shield connector having a cylindrical sleeve portion and means for expanding said shield connector within said connector bore in response to force applied in a axial direction to said expanding means, forcibly inserting said cylindrical sleeve portion into said annular space, attaching said shield connector in fixed position to the end portion of said coaxial cable, positioning an annular elastomeric sealing member in coaxial surrounding relation to the expanded end portion of said outer insulation jacket associated with said sleeve portion and generally adjacent said expanding means, positioning within said connector bore the end portion of said coaxial cable with said shield connector, said expanding means and said sealing member thereon, and applying force in an axial direction and toward said coaxial cable to said sealing member to urge said central conductor into engagement with said electrical contact means, expand said shield connector into engagement with the wall of said connector bore and radially expand said elastomeric sealing member into sealing engagement with said coaxial cable and the wall of said connector bore.