| 摘要 |
A load resisting device for use in an exercise machine which includes a cylinder, a piston which is movable in a first direction inside the cylinder against a force generated by air pressure in the cylinder, and an O-ring seal, mounted to the piston, which provides a seal between the piston and the cylinder, when the piston is moved in a first direction, and which allows air to bypass the O-ring when the piston is moved in a second direction which is opposite to the first direction.
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