Air cushion cylinder apparatus with a lock

   
   

A lock mechanism of a cylinder includes a lock member for locking or unlocking a piston rod by actions of air pressure and a spring force, a third pressure chamber for causing air pressure to act on the lock member, and a third port. In a pneumatic circuit, a check valve and a throttle valve are connected in parallel in each of first and second pipes connecting first and second ports of the cylinder and a solenoid valve and a check valve and a throttle valve are connected in parallel in a third pipe connecting the third port and the first pipe or the second pipe.

 
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