Patent US3799530A successfully refreshed from Google Patents.
US3799530A
Expired / Lapsed
US
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Hydraulic cushion mechanism
Assignee: Individual
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Filing: 1972-10-16
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Granted: 1974-03-26
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Expires: 1992-10-16
Abstract
Abstract A hydraulic cushion mechanism embodying a piston adapted to receive an impact moving within a bore wherein a decreasing clearance between the cylinder and bore is provided, the piston being equipped with an accumulator to maintain separation between air and oil.
Inventors
- 👤 H Stembridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:17
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; F16F9/063
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
A hydraulic cushion mechanism comprising a body providing a piston-receiving opening, a piston having a rod projecting from said opening and sealed therein, hydraulic fluid within said opening, said opening and piston being contoured to provide an exponentially decreasing clearance, said rod being hollow and having an accumulator piston mounted therein, spring means in said hollow rod for urging said accumulator piston toward the first mentioned piston, spring means in said opening urging said first mentioned piston so as to extend said rod, and port means in said rod between said first mentioned piston and said accumulator piston to permit displacement of hydraulic fluid from said opening into said hollow rod.
Claim 2
Dependent Claim
111 words
A hydraulic cushion mechanism comprising a body providing a piston-receiving opening, a piston having a rod projecting from said opening and sealed therein, hydraulic fluid within said opening, said opening and piston being contoured to provide an exponentially decreasing clearance, said rod being hollow and having an accumulator piston mounted therein, spring means in said hollow rod for urging said accumulator piston toward the first mentioned piston, spring means in said opening urging said first mentioned piston so as to extend said rod, and port means in said rod between said first mentioned piston and said accumulator piston to permit displacement of hydraulic fluid from said opening into said hollow rod.
Claim 3
Dependent Claim
53 words
The structure of claim 1 in which said first mentioned piston is equipped with check valve means for limiting flow from said opening into said hollow rod upon an impact force being applied to said rod but wiich permits flow from said hollow rod to said opening upon release of said impact force.
References Cited (Backward Citations)
US3488045A
Cited
US3653301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |