Coupler for threaded reinforcing bar
AssigneeIllinois Tool Works Inc.
InventorThomas Murdoch
Life of this patent
Estimating the term…
Abstract
A coupler for mounting to externally threaded reinforcing bar for use in concrete construction, the comprising a body having a portion with an internal thread for engagement with the thread of the reinforcing bar, wherein the thread form at the inner end portion of the internal thread includes on one of its flanks an enlargement of progressively increasing extension, the enlargement extending towards an opposing flank of the thread to provide an increasing friction fit with the thread of the bar. Various embodiments provide the enlargement being only on a part of the face of the flank whereby the remainder of the face of the flank forms, in conjunction with the adjacent flank of the bar thread during tightening, a void for receiving material displaced during tightening.
Claims15
A coupler for mounting to an externally threaded reinforcing bar, the coupler comprising:
- a body having a portion with an internal thread for engagement with threads of the reinforcing bar, wherein an inner end portion of the internal threads include on one of its flanks an enlargement of progressively increasing extension, the enlargement extending towards an opposing flank of the internal threads of inner end portion of the internal threads to provide an increasing friction fit with the threads of the reinforcing bar, the enlargement being only on a part of the face of the flank of the internal threads and wherein a remainder of said face of the flank is configured to form, in conjunction with an adjacent flank of the threads of the reinforcing bar during tightening, a void for receiving material displaced during tightening.
A coupler for coupling two threaded reinforcing bars in end to end relation, the coupler comprising:
- a body having a portion with two sets of internal threads respectively extending inwardly from opposite ends of the body and separated at their inner ends by an internal stop, wherein each set of internal threads includes an enlargement of progressively increasing size on one of the flanks of said set of internal threads.
The coupler of claim 14, wherein one of the enlargements is formed on no more than about two turns of the internal threads.
Dependencies are inferred from the claim text.