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US 11,460,087 B2Granted
Gas spring with overtravel pressure relief
AssigneeDADCO, Inc.
InventorJonathan P. Cotter
Life of this patent
Estimating the term…
Abstract
An industrial gas spring with a pressure chamber in a casing with an end wall, a piston rod received at least in part in the casing for reciprocation between extended and retracted positions and a pressure relief assembly carried by the end wall. The pressure relief assembly may have a membrane communicating with the pressure chamber and a plunger configured to breach the membrane when engaged and moved by the piston rod when it overtravels its design intended retracted position.
Claims18
An industrial gas spring comprising:
- a casing including an axially extending side wall, an open end, a transversely extending end wall axially spaced from the open end, a gas pressure chamber defined in part be the side and end walls, a first blind bore in the end wall opening into and communicating with the gas pressure chamber, and a second blind bore in the end wall opening through an exterior face of the end wall and communicating with an exterior of the casing;
- a piston rod received at least in part in the casing for reciprocation between extended and retracted positions and having an inner end communicating with the pressure chamber and an outer end extending generally axially outwardly of the open end of the casing when the piston rod is in the extended position;
- and
- a pressure relief assembly carried by the end wall of the casing with:
- a membrane unitary with the end wall of the casing as a separating wall between the first and second blind bores and configured with a first face communicating with the pressure chamber and a second face communicating with the exterior of the casing;
- and
- a plunger with a first end adjacent the membrane and configured to breach the membrane and a second end axially spaced from the first end, disposed in the pressure chamber and configured to be engaged by the piston rod to move the plunger to breach the membrane when the piston rod overtravels its design intended maximum retracted position.
4 more elements
An industrial gas spring comprising:
- a casing including an axially extending side wall, an open end, a transversely extending end wall axially spaced from the open end, and a gas pressure chamber defined in part side and end walls;
- a piston rod received at least in part in the casing for reciprocation between extended and retracted positions and having an inner end communicating with the pressure chamber and an outer end extending generally axially outwardly of the open end of the casing when the piston rod is in the extended position;
- and
- a pressure relief assembly carried by the end wall and including:
- a membrane unitary with the end wall of the casing and having a first face communicating with the pressure chamber and a second face communicating with the exterior of the casing, and
- a plunger disposed in the pressure chamber and configured to be engaged by the piston rod to move the plunger to breach the membrane when the piston rod overtravels its design intended maximum retracted position, and having
- a first end adjacent the membrane and configured to breach the membrane,
- a second end axially spaced from the first end, and
- a body with a cylindrical portion at least partially between the first and second ends and frictionally received in part in a blind bore of the casing with an interference or transitional fit to ensure that the plunger does not inadvertently move out of the blind bore.
6 more elements
Dependencies are inferred from the claim text.