Lug wire-binding screw
AssigneeSchneider Electric USA, Inc.
InventorRandy BLAKE
Life of this patent
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Abstract
An electrical connecting assembly includes a combination of a wire-binding screw and washer for fastening a conductor wire to a mechanical lug. The wire is inserted into the lug within a main bore. The screw and washer are inserted into the lug within a secondary threaded bore. The screw has a threaded body with an external thread for coupling to an internal thread of the mechanical lug. The threaded body has a bottom surface from which a boss extends with an end surface being formed-over for retaining the washer. The washer has a top surface in contact with the bottom surface of the screw and a bottom surface in contact with the conductor. The screw rotates independently of the washer, providing improved clamping force and reduced wire-strand breakage during current cycling.
Claims15
An electrical connecting assembly comprising:
- a wire-binding screw having a threaded body and a boss, the boss extending from a bottom surface of the threaded body;
- and
- a washer having an internal rim defining an aperture within which the boss is received, the washer having a top surface in contact with the bottom surface of the wire-binding screw, the washer rotating independently of the wire-binding screw.
A lug assembly for an electrical system, the assembly comprising:
- a mechanical lug having an unthreaded bore and a threaded bore, the threaded bore being in a transverse position relative to the unthreaded bore;
- a screw having a threaded body fastened within the threaded bore of the mechanical lug, the threaded body having a bottom surface from which a boss extends, the boss having a formed-over end near its bottom end;
- and
- a Belleville washer directly coupled to the screw with an internal rim in contact with the boss and pressed past the formed-over end, the formed-over end preventing axial movement of the washer past the bottom end of the screw, the washer being independently rotatable relative to the screw.
Dependencies are inferred from the claim text.