US3693767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable hydraulic shock absorber
Assignee: HYDRAULIC PRODUCTS CORP
•
Filing: 1970-11-05
•
Granted: 1972-09-26
•
Expires: 1990-11-05
Abstract
Abstract A shock absorber comprising a housing, a cylinder mounted within the housing, and a metering sleeve surrounding the cylinder. The cylinder wall is provided with longitudinally spaced openings communicating with annular grooves formed in the exterior of the cylinder wall. The metering sleeve is provided with longitudinally spaced openings adapted to register with the grooves of the cylinder wall to form composite orifices for the egress of fluid from within the cylinder to an annular reservoir in the housing upon the application of a load to the piston rod. The metering sleeve is adjustably slidable relative to the cylinder to vary the effective size of the orifices. The annular grooves take various cross-sectional shapes to control the flow characteristics of the fluid through the orifices.
Inventors
- 👤 Kermit B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/48; F16F9/3207; F16F9/3235; F16F9/3257; F16F9/34; F16F9/346; F16F9/44; F16F9/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A shock absorber comprising: a cylinder, a piston mounted in said cylinder, a piston rod connected to said piston and extending outwardly of said cylinder for receiving a load, a sleeve surrounding said cylinder in telescopic relation therewith, a plurality of openings in the wall of said cylinder, a plurality of annular grooves in said cylinder in registry with said openings and extending about the entire periphery of said cylinder, said annular grooves being wider at the periphery of said cylinder than said cylinder openings, a plurality of openings in said sleeve adapted to register with said grooves, said cylinder openings, grooves and sleeve openings constituting orifices providing egress for fluid in said cylinder when subjected to pressure under the influence of a load applied to said piston rod, and means for adjusting said sleeve axially relative to said cylinder for adjusting the effective area size of said orifices by adjusting the area of communication of each sleeve opening with its corresponding annular cylinder groove.
Claim 2
Dependent Claim
165 words
A shock absorber comprising: a cylinder, a piston mounted in said cylinder, a piston rod connected to said piston and extending outwardly of said cylinder for receiving a load, a sleeve surrounding said cylinder in telescopic relation therewith, a plurality of openings in the wall of said cylinder, a plurality of annular grooves in said cylinder in registry with said openings and extending about the entire periphery of said cylinder, said annular grooves being wider at the periphery of said cylinder than said cylinder openings, a plurality of openings in said sleeve adapted to register with said grooves, said cylinder openings, grooves and sleeve openings constituting orifices providing egress for fluid in said cylinder when subjected to pressure under the influence of a load applied to said piston rod, and means for adjusting said sleeve axially relative to said cylinder for adjusting the effective area size of said orifices by adjusting the area of communication of each sleeve opening with its corresponding annular cylinder groove.
Claim 3
Dependent Claim
20 words
A shock absorber according to claim 1 including a housing surrounding and spaced from said sleeve defining a reservoir therebetween.
Claim 4
Dependent Claim
26 words
A shock absorber according to claim 1 wherein said plurality of cylinder openings, grooves and sleeve openings are spaced axially along said cylinder and sleeve, respectively.
Claim 5
Dependent Claim
45 words
A shock absorber according to claim 1 wherein said sleeve adjusting means comprises a peripheral groove in said sleeve and a shaft having an end portion disposed in said groove and eccentric means whereby rotation of said shaft effects axial adjusting movement of said sleeve.
Claim 6
Dependent Claim
45 words
A shock absorber according to claim 1 wherein said piston rod has passage means establishing communication between opposite sides of said piston in said cylinder and check valve means for closing said passage means against fluid flow therethrough from the working face of said piston.
Claim 7
Dependent Claim
20 words
A shock absorber according to claim 1 wherein each of said annular grooves is defined by spaced, parallel side walls.
Claim 8
Dependent Claim
48 words
A shock absorber according to claim 1 wherein each of said annular grooves has a cross sectional configuration defined by spaced side walls, said side walls diverging from each other to define an opening which becomes progressively larger from said cylinder openings to the exterior of said cylinder.
Claim 9
Dependent Claim
29 words
A shock absorber according to claim 7 wherein the one of said spaced side walls lying adjacent to said sleeve opening is arcuately shaped in an outwardly flaring direction.
Claim 10
Dependent Claim
24 words
A shock absorber according to claim 7 wherein the one of said spaced side walls lying adjacent to said sleeve opening is inclined outwardly.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |