Foldable electrical cable clamp
Disclosed are methods and apparatus for providing and installing electrical wire connector clamps that may be inserted into knockout holes from the inside of an electrical box or panel, that are capable of holding multiple wires or cables, that may be run through the connector before it is slotted into the hole, and that use only a minimal amount of interior space of the electrical box or panel. Embodiments of the present invention include semi-cylindrical units that may be folded together around one or more wires for secure engagement with the wires and with a knockout hole of an electrical box or panel. Embodiments may be used in new construction, and to replace existing connector clamps in an electrical box or panel from the inside without damaging the walls surrounding the box or panel, in order to securely hold wires in an electrical box or panel, add new wire(s), hold multiple wires, and/or increase available space inside the box or panel.
1. A wire clamp apparatus for use with an electrical box or panel comprising:
a semi-cylindrical unit having a convex exterior surface and a concave interior surface;
a central opening bisecting the unit into a first semi-cylindrical half and a second semi-cylindrical half, with two hinge members located at opposite ends of said central opening which movably connect the first and second halves together;
a first semi-circular peripheral flange located at an open end of said first half opposite from said central opening, and at least one deformable tapered tab located on said exterior surface adjacent to said first peripheral flange;
a second semi-circular peripheral flange located at an open end of said second half opposite from said central opening, and at least one second deformable tapered tab located on said exterior surface adjacent to said second peripheral flange; and
a gripping member provided on an interior of at least one of said semi-cylindrical halves of said unit.
2. The apparatus of claim 1 further comprising a second gripping member provided on an interior surface of the other of said semi-cylindrical halves of said unit.
3. The apparatus of claim 1 wherein said gripping member is provided in the form of a plurality of outwardly extending ridges.
4. The apparatus of claim 2 wherein said gripping member and said second gripping member are provided in the form of a plurality of outwardly extending ridges.
5. The apparatus of claim 1 wherein said gripping member is provided in the form of a plurality of outwardly extending teeth.
6. The apparatus of claim 2 wherein said gripping member and said second gripping member are provided in the form of a plurality of outwardly extending teeth.
7. The apparatus of claim 1 wherein said gripping member is provided in the form of a rough frictional surface.
8. The apparatus of claim 2 wherein said gripping member and said second gripping member are provided in the form of rough frictional surfaces.
9. The apparatus of claim 1 wherein said gripping member is provided in the form of an outwardly extending movable finger having a plurality of teeth at a distal end thereof.
10. The apparatus of claim 2 wherein said gripping member is provided in the form of an outwardly extending movable finger having a plurality of teeth at a distal end thereof, and said second gripping members is provided in the form of a plurality of outwardly extending ridges.
11. The apparatus of claim 1 wherein said gripping member is provided in the form of an outwardly extending movable finger having a plurality of ridges at a distal end thereof.
12. The apparatus of claim 2 wherein said gripping member is provided in the form of an outwardly extending movable finger having a plurality of ridges at a distal end thereof, and said second gripping member is provided in the form of a plurality of outwardly extending ridges.
13. The apparatus of claim 1 wherein said gripping member is provided in the form of an outwardly extending movable finger having a rough frictional surface a distal end thereof.
14. The apparatus of claim 2 wherein said gripping member is provided in the form of an outwardly extending movable finger having a rough frictional surface at a distal end thereof, and said second gripping member is provided in the form of a plurality of outwardly extending ridges.
15. The apparatus of claim 2 wherein said gripping member and said second gripping member are provided in the form of outwardly extending movable fingers having a plurality of teeth at distal ends thereof.
16. A method for securely holding one or more wires in an electrical box comprising the steps of:
a. passing at least one wire from outside the electrical box to an inside of the box by extending an end of the at least one wire through a knockout hole in the box;
b. passing the end of said at least one wire through a central opening of a semi-cylindrical unit having a convex exterior side and a concave interior side such that the end of the at least one wire is on the concave interior side of the unit, the opening bisecting the unit into a first semi-cylindrical half and a second semi-cylindrical half, the unit having two hinge members located at opposite ends of said central opening which movably connect the first and second halves together, the unit having at least one frictional surface or member on said concave interior side;
c. folding the two semi-cylindrical halves together to form a cylinder around the at least one wire such that the at least one frictional surface or member firmly engages the at least one wire; and
d. inserting the formed cylinder into the knockout hole.
17. The method of claim 16 wherein semi-circular flanges are provided at opposite ends of said unit such that a circular flange is formed during the step of folding the two semi-cylindrical halves together.
18. The method of claim 17 wherein the circular flange is flush against an inside surface of the box after the formed cylinder is inserted into the knockout hole.
19. The method of claim 18 wherein at least one deformable tab is provided on the convex side of said unit adjacent to each of said semi-circular flanges, such that when the formed cylinder is inserted into the knockout hole, the tabs deform and then pop back such that the semi-circular flanges and the tabs hold the cylinder in place in the knockout hole.