Patent ID: 7823344
Filing Date: 2010-11-02
Classification: E04C,Y10T

Abstract:
1. An apparatus for releasing a tension member, including an anchor fastened to one end of the tension member and a release mounted to the other end of the tension member, said tension member being comprised of a plurality of wires laid together with a uniform pitch, the anchor comprising: an anchor head having open upper and lower ends and a cone-shape wedge-receiving space formed at the upper end of the anchor head; a wedge unit seated in the wedge-receiving space of the anchor head, the wedge unit having three wedges assembled together to form a first hole at a center portion of the wedge unit, through which the tension member is inserted, a support plate inserted into a circular groove formed at an upper portion of the first hole, and an O-shaped ring provided around the three wedges so that the wedges are expanded around the support plate; a spring positioned on an upper portion of the wedge unit for constantly biasing the wedge unit against the wedge-receiving space of the anchor head; and a wedge cover fastened to the anchor head, with the spring being seated on the upper end of the anchor head, and the release comprising: an extended pipe-type release head having a second hole for receiving the other end of the tension member; a release cover fastened to the release head and configured to be hit by a hammer at a position opposite to a position where the release cover is fastened to the release head, said release cover having a third hole for receiving a part of the tension member; and a protrusion protruded from an inner surface of the third hole in a direction perpendicular to the inner surface of the third hole, said protrusion attached to at least one of the wires of the tension member at the other end of the tension member so that at least one of the wires is pushed by the protrusion toward the anchor when the hammer hits the release cover.