Patent US3731771A successfully refreshed from Google Patents.
US3731771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic-hydraulic shock absorber
Assignee: PITTSBURH FORGINGS COMPANY
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Filing: 1972-02-17
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Granted: 1973-05-08
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Expires: 1992-02-17
Abstract
Abstract My improvement is directed to a pneumatic-hydraulic shock absorber having a high pressure chamber formed by a cylinder and a low pressure chamber formed in the hollow portion of a piston slidably mounted in the cylinder, The shock is absorbed by a throttling action of a metering pin positioned in a deflector tube which connects the two chambers and the entrapped gas and foam which settle out in the high pressure chamber is returned to the low pressure chamber means by a passageway therebetween. The improvement is a bulkhead which partitions the low pressure chamber into two separate chambers connected through a sloped tube extending through the bulkhead. Baffles and deflector plates are employed in one of the partitioned chambers to control the movement of fluid so as to prevent the entrapment and transfer of gas into the high pressure chamber.
Inventors
- 👤 N Borgo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:46
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/48; F16F9/486
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
In a shock absorber having a high pressure liquid chamber formed by a hollow cylinder, a low pressure gas and liquid chamber means formed by a hollow piston slidably mounted for horizontal movement in the cylinder, a deflector tube extending through the piston end wall and connecting the two chambers, a metering pin mounted to the high pressure chamber and adapted to operate within the deflector tube and a passageway extending through the piston end wall from substantially the top of said high pressure chamber to substantially the bottom of said low pressure chamber means, the improvement comprising the low pressure gas and liquid chamber means including a first and second chamber separated by a bulkhead said second chamber being substantially free of liquid in at least an extended position, the first chamber communicating with the high pressure chamber by means of the deflector tube and communicating with the second chamber by means of a sloping tube extending through the bulkhead communicating substantially the top of the first chamber with substantially the bottom of the second chamber.
Claim 2
Dependent Claim
177 words
In a shock absorber having a high pressure liquid chamber formed by a hollow cylinder, a low pressure gas and liquid chamber means formed by a hollow piston slidably mounted for horizontal movement in the cylinder, a deflector tube extending through the piston end wall and connecting the two chambers, a metering pin mounted to the high pressure chamber and adapted to operate within the deflector tube and a passageway extending through the piston end wall from substantially the top of said high pressure chamber to substantially the bottom of said low pressure chamber means, the improvement comprising the low pressure gas and liquid chamber means including a first and second chamber separated by a bulkhead said second chamber being substantially free of liquid in at least an extended position, the first chamber communicating with the high pressure chamber by means of the deflector tube and communicating with the second chamber by means of a sloping tube extending through the bulkhead communicating substantially the top of the first chamber with substantially the bottom of the second chamber.
Claim 3
Dependent Claim
35 words
The improvement of claim 1 including a first baffle means extending into the first chamber in the area of the bulkhead-sloping tube jointure to prevent the violent upflow of liquid into the overlaying gas pocket.
Claim 4
Dependent Claim
42 words
The improvement of claim 2 including a deflector finger extending downward from a leading end of a mouth of the deflector tube into the first chamber to break up the current caused by liquid issuing from the mouth of the deflector tube.
Claim 5
Dependent Claim
58 words
The improvement of claim 3 including a second baffle means secured to the deflector tube and extending into the first chamber from just above the mouth of the deflector tube to prevent a downward suctioning of gas into the deflector tube from the overlapping gas pocket during a return stroke of the liquid into the high pressure chamber.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |