Patent US4529180A successfully refreshed from Google Patents.
US4529180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally efficient shock absorber
Assignee: Coltec Industries Inc
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Filing: 1984-01-30
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Granted: 1985-07-16
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Expires: 2004-01-30
Abstract
Abstract A thermally efficient shock absorber comprising a strut housing having an open end and a closed end, a piston including a piston housing and a piston head slideable in the strut housing, and a preselected volume of fluid and gas located in the strut and piston housings. A compensating system is provided coupled to the fluid for maintaining a constant fluid-to-gas volume ratio irrespective of thermal variations and a valve is provided for isolating the compensating system from the fluid. In a particular embodiment of the invention, the compensating system includes a gas compensating chamber and a fluid compensating chamber having a movable separator piston therebetween, the fluid compensating chamber being coupled to the fluid in the strut and piston housings. The gas and fluid compensating chambers are contained within the strut housing separate from the gas and fluid in the strut and piston housings. A position indicator is coupled to the valve for causing the valve to isolate the compensating system from the fluid when the shock absorber is positioned to receive loads.
Inventors
- 👤 Robert L. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:27
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/50; F16F9/52; B; B64; B64C; B64C25/00; B64C25/32; B64C25/58; B64C25/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A thermally efficient shock absorber comprising: a strut housing having an open end and a closed end and at least one chamber therein; a piston including a piston housing and a piston head slidable in said strut housing; a preselected volume of fluid and gas located in said piston housing and said chamber and defining a constant fluid-to-gas volume ratio therein; compensating means selectively coupled to said fluid for maintaining said fluid-to-gas volume ratio constant irrespective of thermal variations; and valve means for selectively coupling said compensating means to said fluid.
Claim 2
Dependent Claim
91 words
A thermally efficient shock absorber comprising: a strut housing having an open end and a closed end and at least one chamber therein; a piston including a piston housing and a piston head slidable in said strut housing; a preselected volume of fluid and gas located in said piston housing and said chamber and defining a constant fluid-to-gas volume ratio therein; compensating means selectively coupled to said fluid for maintaining said fluid-to-gas volume ratio constant irrespective of thermal variations; and valve means for selectively coupling said compensating means to said fluid.
Claim 3
Dependent Claim
36 words
The shock absorber of claim 1 wherein said compensating means includes a gas compensating chamber and a fluid compensating chamber having a movable separator piston therebetween, said fluid compensating chamber being selectively coupled to said fluid.
Claim 4
Dependent Claim
28 words
The shock absorber of claim 2 wherein said gas and fluid compensating chambers are contained within said strut housing separate from said preselected volume of fluid and gas.
Claim 5
Dependent Claim
40 words
The shock absorber of claim 2 wherein said strut housing further includes an extension beyond said closed end, said extension terminating in a second closed end and containing therein said gas and fluid compensating chambers and said movable separator piston.
Claim 6
Dependent Claim
25 words
The shock absorber of claim 2 including means for selectively coupling the fluid in said fluid compensating chamber to the fluid in said piston housing.
Claim 7
Dependent Claim
50 words
The shock absorber of claim 5 wherein said coupling means includes a hollow metering pin coupled to the closed end of said strut housing and extending into said piston housing, said pin adapted to selectively couple the fluid in said fluid compensating chamber to the fluid in said piston housing.
Claim 8
Dependent Claim
24 words
The shock absorber of claim 2 including means for selectively coupling the fluid in said fluid compensating chamber to the fluid in said chamber.
Claim 9
Dependent Claim
21 words
The shock absorber of claim 1 including means for selectively coupling said compensating means to the fluid in said piston housing.
Claim 10
Dependent Claim
20 words
The shock absorber of claim 1 including means for selectively coupling said compensating means to the fluid in said chamber.
Claim 11
Dependent Claim
34 words
The shock absorber of claim 1 wherein said volume of gas is located in said piston housing and is separated from said volume of fluid by a movable separator contained within said piston housing.
Claim 12
Dependent Claim
41 words
The shock absorber of claim 1 further including position indicator means coupled to said valve means for causing said valve means to isolate the fluid in said compensating means from said fluid when said shock absorber is positioned to receive loads.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |