Patent ID: 7614823

Claim:
A drain board installing device without an anchor plate, which includes a drain casing clamp holder provided to ascend along a leader, a drain casing fixed to the drain casing clamp holder, having a through hole, a reel device supplying a drain board through the through hole of the drain casing, and a drain board temporary clamp device provided in the drain casing, the drain board temporary clamp device comprising: a protrusion body provided at the center part of an inner wall of the through hole below the drain casing; a plate shaped arm provided with a slit to allow the arm to ascend and descend at a predetermined length along a longitudinal direction of the drain casing within the through hole of the drain casing under the guide of the protrusion; and a T shaped rod fixed to a lower part of the plate shaped arm, wherein, when the plate shaped arm and the T shaped rod descend toward the lower end of the drain casing within the maximum range by means of their load, a lower end part of the plate shaped arm descends to the part where a lower end part of the drain casing is located, and when the plate shaped arm and the T shaped rod move toward the upper end of the drain casing within the maximum range by means of their load, a T shaped end part of the rod is caught in a slit formed in the lower end part of the drain casing.