REINFORCING BAR COUPLER

摘要

A position coupler for connecting reinforcing bar in concrete construction where neither bar is able to rotate either conveniently or not at all includes a sleeve (17) at least a portion of which is internally cylindrically threaded and which receives at least one split collar insert (18). The insert has external cylindrical threads (27) which match the internal cylindrical threads (28) of the sleeve and also has internal tapered threads (31) which match the tapered external threads (45) on the bars (42, 43) to be joined. The inserts, in addition to being longitudinally split are provided with either a transverse slot (39) or a hex head (122) on their outer ends to receive a wrench. When a transverse slot (39) is provided a spanner wrench (49) may be inserted between the bar and sleeve. The tightening of the insert creates a wedge action which hoop stresses the sleeve locking the parts together and reduces slippage. The insert may be locked anywhere along the interior of the cylindrical thread portion of the sleeve to connect bars at different axial spacings. In a preferred form the sleeve (17) is machined from stock with the cylindrical threads (22) receiving the insert being formed on one end while the opposite end is provided with a taper thread socket having taper threads which match the external tapered threads (44, 45) of the bars to be joined. In another embodiment the sleeve is formed of tube with the internal cylindrical threads extending the length of the sleeve and an insert for each bar is employed. The sleeve may be provided with opposite hand threads (71, 72) so that rotation of the sleeve will draw the rods together before the inserts are fully torqued and locked.