Cable fitting

• US 5,374,017 A
• Filed: 05/07/1992
• Issued: 12/20/1994
• Est. Priority Date: 02/17/1989
• Status: Expired due to Term

• Current Assignee: Thomas & Betts International Incorporated (ABB Limited)
• Original Assignee: John W. Martin, Mark L. Bryan, William B. Martin
• Inventors: Martin, John W., Martin, William B., Bryan, Mark L.
• Primary Examiner(s): Ramirez, Ramon O.
• Assistant Examiner(s): BERGER, DEREK JOEL
• Application Number:
  US07/879,353
• Time in Patent Office: 957 Days
• Field of Search: 248/56, 248/68.1, 248/73, 248/74.1, 248/74.2, 248/316.2, 174/65 G, 174/153 G, 24/713.6, 24/713.2, 439/459, 439/460, 439/470
• US Class Current: 248/56
• CPC Class Codes: F16L 5/00 Devices for use where pipes, cables or protective tubing pass through walls or partitions passing insulated pipes through walls F16L59/121; arrangements for leading electric cables or lines through walls, floors or ceilings H02G3/22
• CPC Class Codes: H02G 3/065 with means biting into the conductor-insulation, e.g. teeth-like elements or gripping fingers H02G3/0675, H02G3/0683 take precedence

Abstract

The present invention is directed to a cable fitting for insertion in a protective enclosure. The fitting includes one or more cable channels and is constructed of a first staging portion for attachment to the electrical enclosure and a second portion which incorporates strain relief features with gripping teeth for clamping the cable. The fitting is designed for use with one or more cables. In use, it is installed in the panel to the staging position depth, the cable or cables are inserted through the fitting and the panel into the box to the desired position for clamping, and the fitting is inserted into the panel to the installed position to lock the fitting to the box and to clamp the cable within the fitting. The fitting may also be fully inserted and the cable or cables installed thereafter.

Claims

1. A one-piece fitting for securing a cable and the like to a panel, comprising:

a) a first free end and a second end, said first free end having a panel-engaging base with an uninterrupted perimeter, and a passage therethrough for receiving the cable, said passage having an axis a plurality of arms extending from the base toward said second end;

b) outwardly-facing means on said fitting for securing said fitting to said panel;

c) a plurality of arms cantilevered from said base and extending from said first free end toward said second end; and

d) a plurality of inwardly-facing cable gripping teeth on each arm positioned to secure the cable against withdrawal from said fitting without substantially inhibiting cable entry into said fitting, the cable gripping teeth being formed on said arms, wherein said teeth are arranged in rows and wherein the faces of each successive row of said teeth diverge radially away from the axis of said passage from said first free end toward said second end.

2. The fitting of claim 1, wherein each arm includes an enlarged head portion, said teeth being formed on the internal surfaces of each enlarged head portion and being adapted to grip the cable in the passage through the fitting.

3. The fitting of claim 2, wherein each respective arm includes hinge means for hingedly and resiliently mounting said respective arm to said base.

4. The fitting of claim 3, wherein the hinge means are adapted to flex sufficiently to enable camming action rotation of the respective gripping head associated therewith.

5. The fitting of claim 3, wherein said hinge means comprises a reduced cross-section of said respective arm.

6. The fitting of claim 1, wherein the successive rows of said teeth extend to an imaginary plane which is disposed at an angle of from about 5 degrees to about 25 degrees relative to said axis.

7. The fitting of claim 1, including means extending from said base, disposed between adjacent arms, for defining portions of said passage.

8. The fitting of claim 1, further including a plurality of truncated conical segments attached to said base and positioned between said arms.

9. The fitting of claim 1, wherein said base includes a flange portion, said flange portion being sized to limit the insertion of said fitting into said panel.

10. The fitting of claim 1, wherein said fitting is integrally molded in one-piece of an electrically insulating polymer material.

11. The fitting of claim 1, wherein said gripping teeth are arranged in a planar face of each arm.

12. The fitting of claim 1, wherein said gripping teeth are arranged in a curvilinear face of each arm.

13. The fitting of claim 1, wherein said means for securing said fitting to said panel comprises a flange portion on said base and lips on said arms, said flange portion and lips being adapted to engage said panel therebetween.

14. A one-piece fitting for securing a cable and the like to a panel, comprising:

a) a first free end and a second end, said first free a panel-engaging base with an uninterrupted perimeter, and a passage therethrough for receiving the cable, said passage having an axis a plurality of arms extending from the base toward said second end;

b) outwardly-facing means on said fitting for securing said fitting to said panel;

c) a plurality of arms cantilevered from said base and extending from said first free end toward said second end; and

d) a plurality of inwardly-facing cable gripping teeth on each arm positioned to secure the cable against withdrawal from said fitting without substantially inhibiting cable entry into said fitting, the cable gripping teeth being formed on said arms, wherein said teeth are arranged in rows, and wherein the faces of each successive row of said teeth diverge radially away from the axis of said passage from said first free end toward said second end, wherein said gripping teeth extend to at least two imaginary planes inward of each arm.

15. A unitary fitting for securing cable and the like to a panel, comprising:

a) a first free end and a second end, said first free end having a panel-engaging base and a passage extending through said fitting for receiving the cable, said passage having an axis;

b) outwardly-facing means on said fitting for securing said fitting to said panel;

c) a plurality of arms cantilevered from said base and disposed about said passage, each arm including hinge means for hingedly and resiliently mounting said arms to the base, each arm including an enlarged head portion; and

d) a plurality of inwardly-facing cable gripping teeth positioned to confront and grip a cable in the passage to secure said cable against withdrawal from said base, said cable gripping teeth being formed on said enlarged head portions of said arms, and said teeth being arranged in rows such that the faces of each successive row of said teeth diverge radially away from the axis of said passage from said first free end toward said second end.

16. The fitting of claim 15, wherein the hinge means are adapted to flex sufficiently to enable camming action rotation of the respective gripping heads associated therewith.

17. The fitting of claim 15, further including a plurality of truncated conical segments attached to said base and positioned between said arms.

18. The fitting of claim 15, wherein said fitting is molded in one-piece of a plastic material.

19. The fitting of claim 15, wherein said hinge means comprises a reduced cross-section of each arm.

20. A one-piece fitting for securing a cable and the like to a panel, comprising:

a) a first free end and a second end, said first free end having a panel-engaging base with an uninterrupted perimeter, a passage therethrough for receiving the cable, said passage having an axis and a plurality of arms extending from the base toward said second end;

b) outwardly-facing means on said fitting for securing said fitting to said panel;

c) a plurality of arms cantilevered from said base and extending from said first free end toward said second end, each respective arm including a gripping head and hinge means for hingedly and resiliently mounting said respective arm to said base to enable camming action rotation of the respective gripping head associated therewith; and

d) a plurality of inwardly-facing cable gripping teeth positioned to secure the cable against withdrawal from said fitting, a plurality of said cable gripping teeth being formed on each of said heads, whereby a withdrawal force applied to said cable results in a pressure which, through said camming action rotation, creates a clamping force on said cable that prevents the cable from being withdrawn from said passage, wherein said teeth are arranged in rows, and wherein the faces of each successive row of said teeth diverge radially away from the axis of said passage from said first free end toward said second end.