Patent ID: 6805827
Filing Date: 2004-10-19
Classification: B22D,B29C

Abstract:
A clamping device comprising:a movable platen having a movable metallic mold, capable of going forward and back; a stationary platen having a stationary metallic mold, arranged being opposed to the movable platen; and an opening and closing operation mechanism for opening and closing the movable and the stationary platen respectively having the movable and the stationary metallic mold, the movable and the stationary platens being connected with each other by tie rods, the clamping device further comprising a pressurizing mechanism, the pressurizing mechanism including: a pressure plate arranged between the stationary platen and the stationary metallic mold, the stationary metallic mold being attached to the pressure plate; a piston slidably arranged in a cylinder provided in the stationary platen, the piston being capable of protruding toward the pressure plate; a bladder arranged between the piston and the cylinder in the stationary platen, the bladder being capable of clamping the movable and the stationary metallic molds via the piston when the bladder is expanded and contracted by supplying and discharging hydraulic pressure; and a soft protective member interposed between the piston and the bladder and capable of closing a gap between them when the bladder is expanded.