| 摘要 |
PROBLEM TO BE SOLVED: To provide a spreader for door frame removal for efficiently and neatly peeling off and removing a door frame from a mortar part after a mortar destruction work around the outer peripheral part of the door frame is completed. SOLUTION: A claw for spreading a clearance between the door frame and the mortar part by inserting into the clearance between the door frame and the mortar part, a claw expansion means for spreading the claw by a primary expansion mechanism and a secondary expansion mechanism, and a hydraulic cylinder for providing a drive force to the claw expansion means are connected to a body metal fitting. The rod of the hydraulic cylinder is extended by an external hydraulic pump to spread the clearance between the door frame and the mortar part so as to peel off the door frame from the mortar part. The primary expansion mechanism is so structured that the claw can be spread in a sector shape around a rotating shaft, and the secondary expansion mechanism is so structured that the claw can be spread parallel with each other by sliding a slide shaft for a claw holding metal fitting in the slide groove of the body metal fitting. COPYRIGHT: (C)2004,JPO
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