Modular protector for telecommunications equipment

• US 4,710,846 A
• Filed: 04/15/1987
• Issued: 12/01/1987
• Est. Priority Date: 09/16/1985
• Status: Expired due to Term

• Current Assignee: Avaya Technology Corporation Miami Lakes FLA US
• Original Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Inventors: Heisinger, Robert F.
• Primary Examiner(s): SALATA, ANTHONY J
• Assistant Examiner(s): Wysocki, A. Jonathan
• Application Number:
  US07/040,709
• Time in Patent Office: 230 Days
• Field of Search: 361/117-119, 361/124, 361/129
• US Class Current: 361/119
• CPC Class Codes: H01T 4/04 Housings H01T4/06 takes precedence

Abstract

An adaptor terminates one or more modular protectors of the same size obviating the need for a telephone company to carry an inventory of many different sizes. Each modular unit, which protects a telephone line, has a hollow shell into which two terminals are received, each terminal communicating with a protector. The terminals are elevated above a landing on the housing so that the distance between the two terminals exceed a predetermined distance to reduce noise. The protectors are enclosed within the hollow shell by a base cover which is secured in place by a grounding clip which has many tines on one end for penetrating the side of the housing; the other end of the grounding clip is so formed as to secure the housing to the adaptor.

Claims

1. Apparatus for protecting equipment connected to a telephone line and for protecting persons using said equipment against spurious voltages and spurious currents said apparatus comprising

(1) a housing, said housing comprising a base, a landing, first and second wells between said base and said landing, each of said wells having an end elevated above said landing by a predetermined height and an opening through each end, the base of said housing having a trough surrounding the interior walls of said wells,

(2) first and second terminals, said terminals housed within said first and second wells, respectively, said terminals forming a substantially air tight seal with said ends, and said terminals projecting through said openings,

(3) first and second protectors introduced through an opening in said base and housed within said first and second wells respectively and communicating with said first and second terminals,

(4) first and second springs communicating with said first and second protectors,

(5) a base cup, said base cup substantially covering said open base and retaining said first and second springs in said first and second wells respectively said base cup lodged within said trough, trapping an air pocket within said housing and forming a substantial seal with said housing, and

(6) means for grounding said spurious signals from said first and second terminals, said grounding means comprising a plurality of tines, said tines retaining said base cup in position by penetrating apertures in opposite walls of said housing to form a tight seal, said grounding means further comprising means for securing said grounding means to a binding post of an adaptor.

2. The apparatus of claim 1 wherein said base cup and said tines within said base are covered with a potting compound to prevent contaminants from entering said protector unit, said seal between said walls and said tines preventing said potting compound from leaking from said base, and the air pocket trapped within said housing preventing said potting compound from entering said protector units.

3. The apparatus of claim 2 wherein said spring is a volute spring, said volute spring providing a high current carrying capacity.

4. The apparatus of claim 2 wherein said protector comprises

a pellet, said pellet being an alloy having a predetermined melting point range,

a surge arrester, said surge arrester becoming conductive above a predetermined voltage level, and

a drawn brass cup, said drawn brass cup housing said pellet and said surge arrester.

5. The apparatus of claim 2 wherein said housing comprises means for securing one or more conductors to said housing after said conductor has been terminated at said terminals.

6. The apparatus of claim 5 wherein said housing is made from glass filled polybutylene terephthalate.

7. The apparatus of claim 2 wherein each of said terminals comprises a knurled for being retained within said housing.

8. The apparatus of claim 7 wherein each of said terminals comprises

a first means for terminating either a tip conductor or a ring conductor of a telephone drop wire, and

a second means for terminating one or more corresponding tip or ring conductors to be connected to telecommunications equipment.

9. The apparatus of claim 2 wherein said apparatus is secured to an adaptor, said adaptor comprising

a central section and two flanges, said two flanges connected to said central section by two walls respectively, said central section being raised above said two flanges, said central section defining an opening for receiving said binding post, said two flanges comprising means for securing said adaptor to a support for said apparatus, and

said binding post comprising

(a) a threaded brass mounting post and a brass nut for securing one or two of said protector units, and

(b) a pronged washer, a plurality of flat washers and a second nut for terminating one or more conductors connected to ground potential.

10. The apparatus of claim 2 wherein said base cup is made from material having high electrical conductivity.

11. A modular telephone line protector for conveying surge voltages and fault currents to ground, said line protector comprising

(1) a housing shell comprising an open base and a closed end, a plurality of wells between said open base and said closed end, said closed end defining an orifice with each of said wells, the open base having a trough surrounding said wells, each well having a top end, the top ends of said wells being raised above said base so that the surface distance between any two of said terminals within said wells exceeds a predetermined distance.

(2) each of said wells comprising in series

(a) a terminal, said terminal projecting through said orifice and used for terminating conductors, said terminal forming a substantially air tight seal with said top end,

(b) a protector, and

(c) a volute spring

(3) a cup retaining said volute spring and said protector against said terminal within each of said wells, said cup fitting within said trough and substantially covering said open base, and

a grounding clip, said grounding clip comprising means for retaining said base cup within said trough of said open base of said housing shell, said means for retaining said base cup forming a substantial seal with said housing shell, said grounding clip further comprising means for securing said protector to a conductor terminating means of an adaptor.

12. The modular protector of claim 11 wherein said cup and said means for retaining said cup within said trough are covered with a potting compound to prevent contaminants from entering said protector, an air pocket trapped within said housing shell preventing said potting compound from entering said housing.

13. The modular protector of claim 12 wherein said conductor terminating means of said adapter comprises

(1) an elongated metallic bar having a central section and two side sections, said two side sections being substantially perpendicular to said central section, said central section having a first plurality of openings and a second plurality of openings, said first plurality of openings being used to receive means for securing said elongated metallic bar to a surface.

(2) a plurality of conductive, metallic binding posts housed within said second plurality of openings, each of said binding posts comprising a threaded brass mounting post and a brass nut for securing one or two of said ground clips, and

(3) means for conducting spurious signals from said elongated metallic bar to ground potential.

14. The modular protector of claim 12 wherein said housing shell comprises a plurality of means for securing one or more conductors adjacent to said housing shell.

15. The modular protector of claim 12 wherein said housing shell is made from glass filled polybutylene terephthalate.

16. The modular protector of claim 12 wherein said terminal comprises a knurled shoulder fitting tightly within said top end of said well.

17. The modular protector of claim 12 wherein said protector comprises a gas tube, said gas tube designed to conduct above a predetermined voltage.

18. The modular protector of claim 12 wherein said adaptor further comprises

a flat surface having a plurality of apertures through which means for securing said adaptor to a support may be introduced,

an elongated section connected to said flat surface and elevated therefrom by a substantially vertical wall, said elongated section adapted to receive a plurality of studs, each of said studs being used to secure at least one of said protector, and

means for connecting said adaptor to ground.

19. An improved station protector for conveying spurious voltages and spurious currents in a telephone line to ground potential, said protector comprising

a housing having a base, a landing and first and second wells between said base and said landing, each well having an end with an aperture and a terminal projecting through said aperture,

first and second protectors, respectively, lodged in said first and second wells, and

first and second resilient means urging, respectively, said first and second protectors against said terminals,

the improvement comprising

said terminals forming a substantially air tight seal with the end of said wells,

said ends of said first and second wells being elevated above said landing so that the distance between said two ends measured along the height of each well above the landing and the length along the landing between the two wells exceeds a predetermined value,

said base having a trough open to the atmosphere and surrounding said first and second wells,

a base cup substantially closing said open trough and lodged within said trough said base cup making contact with said first and second resilient means, and

retaining means penetrating a pair of side walls of said base to retain said base cup within said trough.

20. The protector of claim 19 wherein said retaining means comprises first and second substantially parallel ends separated by a vertical member, said vertical member lying along a side wall of said housing, said second end having means for securing said protector to an adaptor, said retaining means also conveying spurious voltages and currents to ground potential via said adaptor, said second end directed away from said housing.

21. The protector of claim 20 wherein said base cup and retaining means is sealed with a potting compound, a pocket of air trapped within the housing preventing the potting compound from entering said first and second wells.

22. The protector of claim 21 wherein one of the side walls of the housing has means for securing conductors that are terminated on said first and second terminals.

23. A modular telephone line protector for conveying surge voltages and fault currents to ground, said line protector comprising

(1) a housing shell comprising an open base and a closed end, a plurality of wells projecting from said closed end, the open base providing a trough surrounding said wells, each well having a top end, a terminal housed within each well, the top ends of said wells being raised above said base so that the surface distance between any two of said terminals within said wells exceeds a predetermined distance.

(2) each of said wells enclosing in series

(a) said terminal projecting through the top end of said well and used for terminating conductors, said terminal forming a substantially air tight seal with said top end of said well,

(b) a protector,

(c) a spring communicating with said protector,

(3) a cup retaining said spring and said protector against said terminal within each of said wells, said cup fitting within said trough and substantially covering said open base, and

means including a grounding clip for retaining said cup within said trough of the open base of said housing shell, said cup when retained by said retaining means forming a substantial seal with said housing shell, said grounding clip comprising means for securing said line protector to a conductor terminating means.

24. An improved station protector for conveying spurious voltages and spurious currents in a telephone line to ground potential, said station protector comprising

a housing having a base, a landing and first and second wells projecting from said landing, each well having a top end with an aperture therein and a terminal projecting through the top end aperture,

first and second protectors, respectively, lodged in said first and second wells, and

first and second resilient means urging, respectively, said first and second protectors against said terminals,

said terminals forming a substantially air tight seal with the apertured ends of said wells, said apertured ends of said first and second wells being elevated above said landing so that the distance between said two apertured ends measured along the height of each well above the landing and the length along the landing between the two wells exceeds a predetermined value,

said base providing a trough open to the atmosphere and surrounding said first and second wells,

base cup means substantially closing said open trough and lodged within said trough, said base cup means making contact with said first and second resilient means, and

retaining means penetrating said base to retain said base cup means within said trough.