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US 10,527,121 B2Granted
Overtravel pressure relief for a gas spring
AssigneeDADCO, Inc.
InventorJonathan P. Cotter
Life of this patent
Estimating the term…
Abstract
A gas spring with a casing with an axially extending side wall, an open end and a closed end wall spaced from the open end and a pressure chamber provided in part by the walls to receive a gas therein under pressure and a piston rod slidably received in a housing received in the casing and movable between extended and retracted positions. A pressure relief collar slidably carried around the piston rod and normally projecting axially outwardly of the casing can be displaced axially inwardly during an overtravel condition of the piston rod to displace a portion of a piston rod seal to open an overpressure relief path to allow pressurized gas in the pressure chamber to escape to the outside of the gas spring.
Claims20
A gas spring for forming equipment, comprising:
- a casing including an axially extending side wall, an open end, a transversely extending closed end wall axially spaced from the open end, and a pressure chamber established in part by the side and end walls to receive a gas under pressure;
- a bearing assembly carried inside the casing, and including:
- a piston rod housing including a rod inner end, and a rod outer end axially spaced from the rod inner end, and
- a piston rod bearing carried by the piston rod housing;
- a piston rod slidably received in the piston rod bearing for reciprocation between extended and retracted positions;
- a piston rod seal carried between the bearing assembly and the casing open end and in sealing contact with the casing and normally in sealing contact with the piston rod;
- an overtravel pressure relief collar slidably carried around the piston rod at least partially axially between the bearing assembly and the casing open end, and having a collar outer end that normally projects axially beyond the piston rod housing and a collar inner end configured to contact at least a portion of the piston rod seal;
- and
- in an overtravel condition the collar is moved in an axially inward direction with respect to the piston rod seal to open an overpressure relief path between the piston rod and the piston rod seal to allow pressurized gas in the pressure chamber to escape through the relief path to the atmosphere outside of the gas spring.
6 more elements
A gas spring for forming equipment, comprising:
- a casing including an axially extending side wall, an open end, a transversely extending closed end wall axially spaced from the open end, and a pressure chamber established in part by the side and closed end walls to receive a gas under pressure therein;
- a piston rod housing including an inner end and an outer end axially spaced from the inner end and received in the casing adjacent the open end of the casing;
- a piston rod extending through the piston rod housing and having an inner end received in the pressure chamber and an outer end normally outside of the casing;
- a piston rod seal carried by the housing and normally providing a seal between the piston rod and the housing;
- a seal carried by the housing and providing a seal between the housing and the casing;
- an overtravel pressure relief collar slidably received around the piston rod, slidably carried by the housing, and having a collar outer end that normally projects axially beyond the open end of the casing and a collar inner end configured to contact at least a portion of the piston rod seat;
- and
- in an overtravel condition the collar is moved in an axially inward direction with respect to the piston rod seal to open an overpressure relief path between the piston rod and piston rod seal to allow pressurized gas in the pressure chamber to escape through the relief path to the atmosphere outside of the gas spring.
5 more elements
A gas spring for forming equipment, comprising:
- a casing including an axially extending side wall, an open end, a transversely extending closed end wall axially spaced from the open end, and a pressure chamber established in part by the side and enclosed end walls to receive a gas under pressure therein;
- a piston rod carried by the casing for reciprocation between extended and retracted positions and having an inner end in the pressure chamber and an outer end normally outside of the casing;
- a piston rod seal carried by the casing and normally in sealing engagement with the piston rod;
- an overtravel pressure relief collar slidably received around the piston rod, carried by the casing, having a collar outer end normally projecting axially outward beyond the open end of the casing, and a collar inner end configured to contact at least a portion of the piston rod seal;
- and
- in an overtravel condition, the collar is moved in an axially inward direction with respect to the piston rod seal to open an overpressure relief path between the piston rod and the seal to allow pressurized gas in the pressure chamber to escape through the relief path to the atmosphere outside of the gas spring.
3 more elements
Dependencies are inferred from the claim text.