US4078638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil pressure shock absorber
Assignee: SHOWA MANUFACTURING Co Ltd
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Filing: 1977-01-05
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Granted: 1978-03-14
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Expires: 1997-01-05
Abstract
Abstract An oil pressure shock absorber which can be disassembled wherein an inner cylinder having a free piston fitted in it and a high pressure gas enclosed on the base end side is slidably fitted at the tip inside an outer cylinder, an oil seal is provided on their sliding contact surfaces, a plurality of orifices arranged in the axial direction are formed on the side wall of the inner cylinder inserted in the outer cylinder, an annular concave groove is formed on the inside surface of the outer cylinder so as to be opposed to the above mentioned orifices, axial concave grooves are made on the outside surface of the inner cylinder from its tip and the tip part of the inner cylinder and the interior of the outer cylinder are filled with oil, thereby a collision energy may be uniformly absorbed over the entire range of the stroke.
Inventors
- 👤 Kiyosaburo Koyama
- 👤 Hitoshi Okayasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:20
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/346; F16F9/06; F16F9/063; F16F9/48
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
An oil pressure shock absorber comprising an outer cylinder fixed at the base end thereof to a car body, an inner cylinder having a closed end and an axial orifice through said closed end, slidably fitted in the tip part thereof in said outer cylinder and having a bracket at the base end thereof and a free piston fitted in said inner cylinder, a stopper means formed at the tip of said outer cylinder and a step part provided on the outside surface of said inner cylinder so as to be able to engage with said stopper means, said inner cylinder having a plurality of orifices arranged in the axial direction through the side wall thereof and being provided wth concave grooves in the axial direction from the tip on the outside surface, thereof said outer cylinder having an annular concave groove formed on the inside surface so as to be opposed to said orifices, a high pressure gas being enclosed between said free piston and the base end of said inner cylinder and the space between said free piston and the tip of said inner cylinder and the interior of the outer cylinder being filled with oil, wherein an oil seal is provided on the sliding contact surface of said inner cylinder with said outer cylinder.
Claim 2
Dependent Claim
217 words
An oil pressure shock absorber comprising an outer cylinder fixed at the base end thereof to a car body, an inner cylinder having a closed end and an axial orifice through said closed end, slidably fitted in the tip part thereof in said outer cylinder and having a bracket at the base end thereof and a free piston fitted in said inner cylinder, a stopper means formed at the tip of said outer cylinder and a step part provided on the outside surface of said inner cylinder so as to be able to engage with said stopper means, said inner cylinder having a plurality of orifices arranged in the axial direction through the side wall thereof and being provided wth concave grooves in the axial direction from the tip on the outside surface, thereof said outer cylinder having an annular concave groove formed on the inside surface so as to be opposed to said orifices, a high pressure gas being enclosed between said free piston and the base end of said inner cylinder and the space between said free piston and the tip of said inner cylinder and the interior of the outer cylinder being filled with oil, wherein an oil seal is provided on the sliding contact surface of said inner cylinder with said outer cylinder.
Claim 3
Dependent Claim
89 words
The oil pressure shock absorber according to claim 1 wherein the stopper means consisting of an annular concave groove formed on the inside surface of an end of said outer cylinder, a snap ring fitted in said concave groove and being urged to be in close contact with the stepped portion formed on the outer surface of said inner cylinder and a plurality of axial cut-out grooves provided at an extreme end of said outer cylinder, the bottom of said grooves extending to said annular concave groove, is provided.
Claim 4
Dependent Claim
27 words
The oil pressure shock absorber according to claim 1 wherein said free piston is held on the inside surface of said inner cylinder by a snap ring.
References Cited (Backward Citations)
FR1069537A
Cited
DE1109968B
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US3491993A
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DE2166749A1
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US3804217A
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US3870130A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |