| 摘要 |
The purpose of the present invention is to adopt, in a clamp apparatus, a piston member that partitions the cylinder bore, and to make it possible for all of the force acting on the piston member due to fluid pressure to be boosted by a booster mechanism, and transmitted to the output rod. This fluid pressure-driven clamp apparatus (1) is provided with: a slidable piston member (7) that vertically partitions a cylinder bore (6); first and second fluid pressure action chambers (8, 9) formed to the lower side and the upper side of the piston member (7) in the cylinder bore (6); a pressure fluid passage (24) that, during an upward light-load stroke of the piston member (7) due to the fluid pressure of the first fluid pressure action chamber (8), causes the back pressure of the second fluid pressure action chamber (9) to be received by the output rod (4), in such a way that the output rod (4) is advanced by the back pressure; a booster mechanism (10) that, during a heavy-load stroke of the piston member (4) at the conclusion of an ascending operation, boosts the force acting on the piston member (7) with the fluid pressure of the first fluid pressure action chamber (8), and transmits the force to the output rod (4); and a linking mechanism (11) that, during unclamping through a descending operation of the piston member (7), links the output rod (4) and the piston member (7) subsequent to a prescribed stroke descent. |
