Abstract: A double-acting hydraulic cylinder consists of a cylindrical body having an inner wall and an outer wall and a piston rod attached with a piston movably mounted within the inner wall and dividing a space within the inner wall into a rear chamber and a front chamber. A rear seat is mounted on a rear end of the body and defines a first bypass communicating a first space between the inner and outer walls with the rear chamber. A front seat is mounted on a front end of the body. A block is mounted between the piston and the front seat and defines a second bypass communicating the first space and the front chamber. The front seat defines a first control channel and a second control channel which communicate with each other at a common end and a communication conduit in communication with a communication tube in communication with the rear chamber.

Abstract: A double-acting hydraulic cylinder for use in an exercising apparatus to provide a resistance to a user of the exercising apparatus is disclosed.

Abstract: A double-acting hydraulic cylinder consists of a cylindrical body having an inner wall and an outer wall and a piston rod attached with a piston movably mounted within the inner wall and dividing a space within the inner wall into a rear chamber and a front chamber. A rear seat is mounted on a rear end of the body and defines a first bypass communicating a first space between the inner and outer walls with the rear chamber. A front seat is mounted on a front end of the body and defines a second bypass communicating the first space and the front chamber and a first control channel and a second control channel which communicate with each other at a common end by a communicating channel in communication with the first space.