Locking F terminator for coaxial cable systems

• US 6,491,546 B1
• Filed: 03/07/2000
• Issued: 12/10/2002
• Est. Priority Date: 03/07/2000
• Status: Expired due to Fees

• Current Assignee: PPC Broadband Incorporated (Belden Inc.)
• Original Assignee: John Mezzalingua Associates Incorporated
• Inventors: Perry, Jason
• Primary Examiner(s): TA, THO DAC
• Application Number:
  US09/520,749
• Time in Patent Office: 1,008 Days
• Field of Search: 439/620, 439/307, 439/133, 439/135, 439/271, 439/578
• US Class Current: 439/620.03
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/42 comprising impedance matching means or electrical components, e.g. filters or switches
• CPC Class Codes: H01R 24/542 Adapters
• CPC Class Codes: H01R 43/22 Hand tools

Abstract

A tamper-resistant device for terminating a connection to a coaxial cable is provided. The device includes an outer coaxial shell, a threaded connector body housed in the coaxial shell with a snap fit, and a resistor case held within the connector body, and a resistor. A sealing member is included between the resistor case and the connector body to provide a secure seal between these components. The resistor includes a central conductor that is sufficiently durable to avoid being damaged during shipping or installation. The connector body contains slots formed in one end, which permit the device to be installed and removed only with a special tool that is available to cable installers but not to the general public.

Claims

1. A tamper-resistant device for terminating a connection comprising:

a coaxial shell having a first end and a second end;

a connector body having a first end and a second end, the connector body being dimensioned and configured to be snap fitted within the coaxial shell and including interior threads disposed at the first end of the connector body adjacent the first end of the coaxial shell;

at least one slot in the second end of the connector body for engagement with a cooperating tool to rotate the connector body with respect to the coaxial shell such at least one slot extending from the outside of the connector body to the inside of the connector body;

a resistor case having a first end and a second end, the resistor case being dimensioned and configured to be mounted within the connector body; and

a sealing member between the connector body and the resistor case, the sealing member disposed proximate a portion of the interior threads opposite the first end of the connector body and gripping at least a portion of the first end of the resistor case.

2. The device of claim 1, wherein at least a portion of an outer surface of the second end of the coaxial shell is threaded.

3. The device of claim 1, wherein the coaxial shell and the connector body are cylindrically symmetric about a longitudinal axis, the inner diameter of the second end of the coaxial shell being substantially equal to the inner diameter of the second end of the connector body.

4. The device of claim 1, wherein the second end of the connector body includes two slots.

5. The device of claim 1, wherein the resistor case is cylindrically symmetric about a longitudinal axis, the second end of the resistor case including a cylindrical hole and a frustoconical bevel.

6. The device of claim 1 including a tool having a retractable tab for insertion in at least a slot.

7. The device of claim 1, further comprising a resister mounted within the resistor case for electrical connection through the second end of the coaxial shell.

8. The device of claim 7, wherein the resistor comprises a central conductor and a body.

9. The device of claim 8, wherein the resistor has an impedance of about 75 Ω

.

10. The device of claim 8, wherein the central conductor extends through the hole in the resistor case, and is mounted within the resistor case by solder filled in a frustum-shaped cavity defined by the frustoconical bevel.

11. The device of claim 8, wherein the resistor case is soldered to the connector body.

12. The device of claim 8, wherein the sealing member is composed of silicone rubber.

13. The device of claim 8, wherein the central conductor has a diameter between about 0.029 and about 0.035 inches.

14. The device of claim 13, wherein the central conductor has a diameter substantially equal to about 0.032 inches.

15. The device of claim 8, wherein the resistor case comprises an annularly shaped ground plane.

16. The device of claim 15, wherein the outside diameter of the annularly shaped ground plane is greater than 0.280 inches.

17. The device of claim 16, wherein the outside diameter of the annularly shaped ground plane is substantially equal to about 0.281 inches and the inside diameter of the annularly shaped ground plane is substantially equal to about 0.210 inches.

18. The device of claim 8, wherein the resistor case is composed of metal.

19. The device of claim 18, wherein the resistor case is composed of brass and plated with a material selected from the group consisting of nickel and tin.

20. The device of claim 8, wherein the connector body is composed of metal.

21. The device of claim 20, wherein the connector body is composed of brass.

22. The device of claim 8, wherein the connector body is composed of plastic.

23. The device of claim 22, wherein the connector body is composed of a material selected from the group consisting of Ultem and glass-filled polycarbonate.

24. The device of claim 8, wherein the coaxial shell is composed of metal.

25. The device of claim 24, wherein the coaxial shell is composed of brass.

26. The device of claim 8, wherein the coaxial shell is composed of plastic.

27. The device of claim 26, wherein the coaxial shell is composed of a material selected from the group consisting of Ultem and glass-filled polycarbonate.

28. A tamper-resistant device for terminating a connection comprising:

a coaxial shell having a first end and a second end;

a connector body having a first end and a second end, the connector body being dimensioned and configured to be snap fitted within the coaxial shell and including interior threads disposed at the first end of the connector body adjacent the first end of the coaxial shell, the connector body further including two slots in its second end for engagement with a cooperating tool to rotate the connector body with respect to the coaxial shell, such slots extending from the outside of the connector body to the inside of the connector body;

a resistor case having a first end and a second end, the resistor case being dimensioned and configured to be mounted within the connector body;

a resistor mounted within the resistor case for electrical connection through the second end of the coaxial shell; and

a sealing member between the connector body and the resistor case, the sealing member disposed proximate a portion of the interior threads opposite the first end of the connector body and gripping at least a portion of the first end of the resistor case.

29. The device of claim 28, wherein the coaxial shell is composed of brass, the connector body is composed of brass, and the resistor case is composed of brass plated with nickel.

30. The device of claim 28 including a tool having a retractable tab for insertion in at least one of such slots.

31. The device of claim 28, wherein the resistor comprises a central conductor with a diameter between about 0.029 and about 0.035 inches.

32. The device of claim 31, wherein the central conductor has a diameter substantially equal to about 0.032 inches.

33. The device of claim 28, wherein the resistor case comprises an annularly shaped ground plane with an outside diameter greater than 0.280 inches.

34. The device of claim 33, wherein the inside diameter of the annularly shaped ground plane is substantially equal to about 0.210 inches.

35. A tamper-resistant device for terminating a connection comprising

a coaxial shell having a first end and a second end;

a connector body having a first end and a second end, the connector body being dimensioned and configured to be snap fitted within the coaxial shell and including interior threads disposed at the first end of the connector body adjacent the first end of the coaxial shell, the connector body further including two slots in its second end for engagement with a cooperating tool to rotate the connector body with respect to the coaxial shell, such slots extending from the outside of the connector body to the inside of the connector body;

a resistor case having a first end and a second end, the resistor case being dimensioned and configured to be mounted within the connector body, the resistor case comprising an annularly shaped ground plane with an outside diameter greater than 0.280 inches;

a resistor mounted within the resistor case for electrical connection through the second end of the coaxial shell, the resistor comprising a central conductor and a body, the central conductor having a diameter between about 0.029 and about 0.035 inches; and

a sealing member between the connector body and the resistor case, the sealing member disposed proximate a portion of the interior threads opposite the first end of the connector body and gripping at least a portion of the first end of the resistor case.

36. The device of claim 35, wherein the diameter of the central conductor has a diameter substantially equal to about 0.032 inches.

37. The device of claim 35, wherein the inside diameter of the annularly shaped ground plane is substantially equal to about 0.210 inches.

38. The device of claim 35, wherein the coaxial shell is composed of brass, the connector body is composed of brass, and the resistor case is composed of brass plated with nickel.

39. The device of claim 35 including a tool having a retractable tab for insertion in at least one of such slots.