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US 11,959,530 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.
Claims12
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 by the side and end walls, a bore in the end wall communicating with the pressure chamber, and a counterbore in the end wall communicating with the exterior of the end wall;
- 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 with:
- a membrane separate and removable from the end wall, received in the counterbore in the end wall of the casing, 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 received in the bore in the end wall of the casing and including 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, and
- a collar removably received in the counterbore and bearing on and retaining the separate membrane in the counterbore, wherein the collar has a circumferentially continuous surface for engagement with the membrane to force it into metal to metal sealing engagement with a circumferentially continuous portion of the counterbore when the collar is threaded into the counterbore.
5 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, a gas pressure chamber defined in part by the side and end walls, a first bore in the end wall communicating with the pressure chamber, and a second bore in the end wall communicating with the exterior of the end wall;
- 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 with:
- a membrane separate and removable from the end wall, received in the second bore in the end wall of the casing, 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 received in the first bore in the end wall of the casing and including 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, and
- a collar removably received in the second bore and bearing on and retaining the separate membrane in the second bore, wherein the collar engages the membrane to force it into sealing engagement with a shoulder or end face of the second bore.
5 more elements
Dependencies are inferred from the claim text.