Chain links and cable carrier chains containing same

A chain link for use in a cable carrier chain, comprising:

• (1) laterally spaced first and second side plates, each of the plates having a first end and an opposite second end, the plates each further comprising an inwardly offset section and an outwardly offset section;
• (2) axially aligned first and second undercut pins disposed on outer surfaces of the first ends of the first and second side plates, the first undercut pin being disposed on the inwardly offset section of the first side plate, the second undercut pin being disposed on the inwardly offset section of the second side plate;
• (3) axially aligned first and second round apertures formed in the second ends of the first and second side plates, respectively;
• the first aperture being disposed on the outwardly offset section of the first side plate, and the second aperture being disposed on the outwardly offset section of the second side plate;
• (4) a hinged cover lid disposed transversely between the first and second side plates;
• and (5) a bottom support plate transversely connecting the first and second side plates to one another;
• wherein each of the first and second undercut pins comprises a cylindrical shaft, an annular head, and a flat undercut-portion;
• the head comprising a top circumferential edge, a side surface, a bottom surface, and a bottom circumferential edge disposed between the side surface and the bottom surface, the bottom circumferential edge defining the largest diameter of the head;
• the shaft being attached to the bottom surface of the head;
• the flat undercut-portion being formed on the bottom surface of the head and being defined between the bottom circumferential edge of the head and a top circumferential edge of the shaft;
• further wherein each of the first and second round apertures is configured to receive an undercut pin which is identical in configuration and dimension to the first or second undercut pin;
• each of the apertures comprising an inner pin-retaining wall having a flat first retaining-surface which is complementary to the flat undercut-portion of the pin, an annular second retaining-surface which is complementary to the shaft of the undercut pin, and an annular third retaining-surface which is complementary to the head of the pin, the third retaining-surface having a top circular edge and a bottom circular edge;
• wherein:
• the diameter of the aperture defined by the second retaining-surface is slightly greater than the diameter of the shaft and smaller than the diameter of the bottom circumferential edge of the head;
• the flat retaining-surface is slightly wider than the undercut-portion;
• the diameter of the aperture defined by the bottom circular edge of the third retaining-surface is slightly greater than the diameter of the bottom circumferential edge of the head;
• and the diameter of the aperture defined by the top circular edge of the third retaining-surface is slightly greater than the diameter of the top circumferential edge of the head and slightly greater than the diameter of the bottom circumferential edge of the head;
• further wherein the hinged cover lid comprises a hinge member having a horizontal primary strap hinge and two vertical secondary hinge straps disposed on opposite ends of the primary hinge strap, the secondary hinge straps being thicker than the primary hinge strap;
• further wherein the bottom support plate has formed on a bottom surface thereof a pair of parallel ribs disposed longitudinally along said bottom surface.

A cable carrier chain, comprising a plurality of chain links pivotally connected in end-to-end fashion, each of the chain links comprising:

• (1) laterally spaced first and second side plates, each of the plates having a first end and an opposite second end;
• (2) first and second undercut pins disposed on outer surfaces of the first ends of the first and second side plates;
• (3) first and second round apertures formed in the second ends of the first and second side plates, respectively;
• (4) a hinged cover lid disposed transversely between the first and second side plates;
• and (5) a bottom support plate transversely connecting the first and second side plates to one another;
• wherein, in each of the chain links, each of the first and second undercut pins comprises a cylindrical shaft, an annular head, and a flat undercut-portion;
• further wherein each of the first and second round apertures is configured to receive an undercut pin which is identical in configuration and dimension to the first or second undercut pin;
• each of the apertures comprising an inner pin-retaining wall having a configuration complementary to and slightly oversized relative to the undercut pin such that the pin is slidably retained within said aperture;
• the retaining wall comprising:
• a flat first retaining-surface for slidable engagement with the undercut-portion of the pin, an annular second retaining-surface for slidable engagement with the shaft of the pin, and an annular third retaining-surface for slidable engagement with the head of the pin;
• further wherein, in said chain, the chain links are joined such that the first and second undercut pins of a middle chain link are mated to the first and second round apertures, respectively, of a first chain link adjacent to a first end of the middle chain link, and the first and second round apertures of the middle chain link are mated to the first and second undercut pins of a second chain link disposed adjacent to a second end of the middle chain link, the first end of the middle chain link being disposed proximate to the first ends of the first and second side plates of said middle chain link, and the second end of the middle chain link being disposed proximate to the second ends of the first and second side plates of said middle chain link.