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Pneumatic spring having selectively releasable rod-retaining structure

  • US 4,309,027 A
  • Filed: 11/27/1979
  • Issued: 01/05/1982
  • Est. Priority Date: 11/28/1978
  • Status: Expired due to Term
First Claim
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1. In a pneumatic spring including a cylinder defining a sealed cavity therein, a piston rod received through an axial end wall of said cylinder for axial movement relative to said cylinder between axially innermost and axially outermost positions, a piston carried by the piston rod within the cavity and dividing the cavity into two compartments, and a body of gas under pressure within said cavity tending to bias the piston rod axially outward of the cavity, the improvememt comprising:

  • means carried in part by the piston rod externally of said cavity and in part by the cylinder at the end thereof through which the piston rod extends for selectively releasably retaining the piston rod at or adjacent said innermost position of the piston rod, said means comprising a sleeve mounted on said cylinder adjacent and extending beyond said end wall and surrounding said piston rod, said sleeve being provided with a substantially axially directed abutment face at the inner circumferential face of its section extending beyond said end wall, and further comprising an abutment member axially fixed with respect to said piston rod adjacent the axially outward end thereof, said abutment member being movable into and out of engagement with said abutment face in a plane substantially transverse to the axis of said piston rod.

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