Hydraulic cylinder and clamp device
AssigneePascal Engineering Corporation
InventorIchiro Kitaura
Life of this patent
Estimating the term…
Abstract
A hydraulic cylinder includes a rod insertion hole formed in a piston member, an auxiliary rod provided to a head side end wall member and capable of being inserted into the rod insertion hole, a rod fitting hole formed to pass through the head side end wall member and the auxiliary rod, a movable rod installed in the rod fitting hole and whose end portion toward a head side end wall projects to the exterior, a movement restriction mechanism that prohibits shifting of the movable rod in an unclamping state and permits shifting of the movable rod in a clamping state.
Claims10
A hydraulic cylinder comprising a cylinder main body in which a cylinder bore is formed, a piston member including a piston portion that is installed in the cylinder bore so as to be movable therein in its axial direction and an output rod, and at least a single hydraulic pressure operation chamber that is defined within the cylinder bore between the piston portion and a head side end wall of the cylinder main body, and further comprising:
- a rod insertion hole formed in said piston portion and said output rod so as to communicate with said hydraulic pressure operation chamber;
- an auxiliary rod that is provided to said head side end wall so as to project into the cylinder bore, and that can be inserted into said rod insertion hole;
- a rod fitting hole that is formed so as to penetrate through said head side end wall and said auxiliary rod in an axial direction;
- a movable rod that is fitted in said rod fitting hole, and of which an end portion toward said head side end wall projects to an exterior from said rod fitting hole;
- a movement restriction mechanism that, along with prohibiting shifting of said movable rod in said axial direction in a state in which a lower end of said piston portion is positioned in a first region within the cylinder bore and permitting shifting of said movable rod in said axial direction in a state in which the lower end of said piston portion is positioned in a second region within the cylinder bore, also, due to hydraulic pressure in said rod insertion hole, shifts the movable rod by a predetermined distance in the direction in which an amount of projection to the exterior from said rod fitting hole increases;
- and
- a detection switch that detects whether said movable rod has shifted or not, and that outputs a detection signal.
A hydraulic pressure driven type clamp device comprising a cylinder main body in which a cylinder bore is formed, a piston member including a piston portion that is installed in the cylinder bore so as to be movable therein in its axial direction and an output rod, and at least a single hydraulic pressure operation chamber that is defined within the cylinder bore between the piston portion and a head side end wall of the cylinder main body, and further comprising:
- a rod insertion hole formed in said piston portion and said output rod so as to communicate with said hydraulic pressure operation chamber;
- an auxiliary rod that is provided to said head side end wall so as to project into the cylinder bore, and that can be inserted into said rod insertion hole;
- a rod fitting hole that is formed so as to penetrate through said head side end wall and said auxiliary rod in an axial direction;
- a movable rod that is fitted in said rod fitting hole, and of which an end portion toward said head side end wall projects to the exterior from said rod fitting hole;
- a movement restriction mechanism that, along with prohibiting shifting of said movable rod in said axial direction in a state in which said piston member is in an unclamp position and permitting shifting of said movable rod in said axial direction in a state in which said piston portion is in a clamp position, also, due to hydraulic pressure in said rod insertion hole, shifts the movable rod by a predetermined distance in the direction in which an amount of projection to the exterior from said rod fitting hole increases;
- and
- a detection switch that detects whether said movable rod has shifted or not, and that outputs a detection signal.
Dependencies are inferred from the claim text.