US3690423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination silastic and friction shock absorber
Assignee: Miner Enterprises Inc
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Filing: 1971-03-31
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Granted: 1972-09-12
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Expires: 1991-03-31
Abstract
Abstract A friction shock absorber having a thin wall cylinder filled with compressible solid, an outer sleeve fitted over and slidably engaging the thin wall cylinder, with the wall thickness of the outer sleeve being approximately three times greater than the wall thickness of the thin wall cylinder, and a piston rod extending into the thin walled cylinder having a piston head in engagement with the inner surface of the cylinder, with the piston head being provided with a multiplicity of axially disposed orifices. When subject to relatively high impact forces, the wall of the cylinder expands radially into tighter frictional engagement with the wall of the outer sleeve and a peripheral orifice is thus obtained for additional throttling of the compressible solid, thereby increasing the shock dissipating capacity of the shock absorber.
Inventors
- 👤 William J Trongeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/08; F16F9/00; F16F9/30; F16F9/303; F16F2224/00; F16F2224/02; F16F2224/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
214 words
A friction shock absorber comprising: a. a thin walled cylinder having a radially expandable side wall, and end wall and an open end; b. an end closure threaded into said open end of said thin walled cylinder; c. a compressible solid contained within said thin walled cylinder; d. a piston rod extending through an opening provided in said end closure into said thin walled cylinder and having a piston head at one extremity with one or more axially disposed orifices, said piston rod terminating into an enlarged portion at the other extremity; e. sealing means to seal said piston rod relative to said opening in said end closure; f. an outer sleeve having a side wall and open ends, said enlarged portion of said piston rod secured to close one of said open ends of said outer sleeve, said outer sleeve telescopically slidable over and in engagement with said thin walled cylinder; and g. said side wall of said thin walled cylinder expanding under high pressure to provide a peripheral orifice between the edge of said piston head and said side wall of said thin walled cylinder thereby increasing the shock dissipating capacity of said friction shock absorber and increasing the frictional engagement between the side wall of said sleeve and thin walled cylinder.
Claim 2
Dependent Claim
214 words
A friction shock absorber comprising: a. a thin walled cylinder having a radially expandable side wall, and end wall and an open end; b. an end closure threaded into said open end of said thin walled cylinder; c. a compressible solid contained within said thin walled cylinder; d. a piston rod extending through an opening provided in said end closure into said thin walled cylinder and having a piston head at one extremity with one or more axially disposed orifices, said piston rod terminating into an enlarged portion at the other extremity; e. sealing means to seal said piston rod relative to said opening in said end closure; f. an outer sleeve having a side wall and open ends, said enlarged portion of said piston rod secured to close one of said open ends of said outer sleeve, said outer sleeve telescopically slidable over and in engagement with said thin walled cylinder; and g. said side wall of said thin walled cylinder expanding under high pressure to provide a peripheral orifice between the edge of said piston head and said side wall of said thin walled cylinder thereby increasing the shock dissipating capacity of said friction shock absorber and increasing the frictional engagement between the side wall of said sleeve and thin walled cylinder.
Claim 3
Dependent Claim
25 words
A friction shock absorber as defined in claim 1 having means to protect the friction surfaces between said thin walled cylinder and said outer sleeve.
Claim 4
Dependent Claim
83 words
A friction shock absorber as defined in claim 2 wherein said means for protecting the friction surfaces between said thin walled cylinder and said outside sleeve includes a layer of replaceable friction material deposited on the outside surface of said side wall of said thin walled cylinder so that friction engagement between said thin walled cylinder and said outer sleeve will be maintained but with a minimum of surface wear resulting from friction engagement of said thin walled cylinder with said outer sleeve.
Claim 5
Dependent Claim
81 words
A friction shock absorber as defined in claim 2 wherein said means for protecting the friction surfaces between said thin walled cylinder and said outer sleeve includes a layer of friction material deposited on the inside surface of said side wall of said outer sleeve so that friction engagement between said thin walled cylinder and said outer sleeve will be maintained but with a minimum of surface wear resulting from friction engagement of said thin walled cylinder with said outer sleeve.
Claim 6
Dependent Claim
26 words
A friction shock absorber as defined in claim 1 having means to selectively control the initial friction between said outer sleeve and said thin walled cylinder.
Claim 7
Dependent Claim
75 words
A friction shock absorber as defined in claim 5 wherein said means to selectively control the initial friction between said outer sleeve and said thin walled cylinder includes a multiplicity of longitudinally disposed slots forming a series of circumferentially disposed fingers at one end of the outer sleeve and adjustable means for exerting uniform radial pressure on said fingers so that tight frictional engagement is maintained between said outer sleeve and said thin walled cylinder.
References Cited (Backward Citations)
US2199145A
Cited
US3397798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |