| 摘要 |
A shock absorbing device includes a housing having a port formed in an end wall, one or more air envelopes disposed in the housing for cushioning purposes, a tube slidably received in the housing and a piston secured to the tube and slidably engaged in the housing and engageable with the envelope, and a valve engaged in the port of the housing for selectively blocking the port of the housing. A pumping device may be used for selectively pumping air into or out of the housing, such as for pumping air into the housing when either of the air envelopes is broken.
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