| 摘要 |
<p>An exercising device which relies on a pneumatic resistance element, and in which on alternate strokes air is inducted or expelled. Inner and outer telescoping cylindrical tubes are provided with handles on their outer ends for manipulating the device, by exerting force in tension, to rectilinearly expand the length of the device, and in compression, to rectilinearly contract the length of the device. A flexible resilient washer mounted at the inner end of the inner tube slidably and sealingly engages the inner surface of the outer tube. Oppositely acting check valves are provided together with respective throttling means at the outer end of the outer tube adjacent its handle. The throttling means, typically consisting of a selectively rotatable multiply apertured outer sleeve, selectively connects the check valves to the outer atmosphere, with one check valve permitting only ingress of air into the outer tube and the other check valve only permitting air egress. The degree of throttling is varied by having apertures of varying size in the sleeve.</p> |
