초록 ▼

An exercising device comprising a computer associated with an actuating arm pivotally mounted on a frame, movement of the actuating arm being resisted by a double acting hydraulic cylinder. Position and pressure sensors associated with the hydraulic cylinder and the actuating arm deliver signals thr

An exercising device comprising a computer associated with an actuating arm pivotally mounted on a frame, movement of the actuating arm being resisted by a double acting hydraulic cylinder. Position and pressure sensors associated with the hydraulic cylinder and the actuating arm deliver signals through the microprocessor to the computer for indicating power or work exerted by a user for moving the actuating arm. The double acting cylinder has a control valve to permit independent adjustment of resistance to movement of the piston in opposite directions.

대표청구항 ▼

A double acting hydraulic cylinder comprising first and second tubular members, the second tubular member extending through the first tubular member forming an annulus between walls of the first and second tubular members; a single piston in said second tubular member; spaced closure means in said a

A double acting hydraulic cylinder comprising first and second tubular members, the second tubular member extending through the first tubular member forming an annulus between walls of the first and second tubular members; a single piston in said second tubular member; spaced closure means in said annulus forming a reservoir; check valve means having a passage communicating with the reservoir and the inside of the second tubular member, said check valve means being adapted to permit flow of fluid from the reservoir to the inside of the second tubular member and to block flow of fluid from each end of the second tubular member to the reservoir; first valve means arranged to meter flow of fluid from a first end of the cylinder to said reservoir upon movement of said piston in the second tubular member in a first direction; second valve means arranged to meter flow of fluid from a second end of the cylinder to sadi reservoir upon movement of said piston in the second tubular member in a second direction; a valve element in each of said valve means to independently and selectively meter fluid flow from each end of the second tubular member to the reservoir upon movement of said piston in opposite directions.