Patent ID: 7107735

Claim:
A coupling device for coupling reinforcing bars used in structural concrete comprising: an elongate tubular body for receiving end portions of said reinforcing bars; at least one face extending longitudinally on an inner surface of said tubular body; a plurality of threaded engagers being adjustably positioned through threaded holes in said tubular body; at least one recessed gripping surface being formed on said at least one face and extending longitudinally on said at least one face; a plurality of teeth formed on said at least one recessed gripping surface, said teeth configured to grip said reinforcing bars in response to an engaging of said reinforcing bars by said plurality of engagers; said coupling device characterised in that: at a cross section of said tubular body said at least one recessed gripping surface defines an arc of a circle having a central point positioned off-set relative to a central point of a cross section of said tubular body; and wherein a toothed portion of said recessed gripping surface is substantially diametrically opposite relative to at least some of said plurality of engagers.