US3789948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor speed actuated vehicle bumper
Assignee: Individual
•
Filing: 1971-01-06
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Granted: 1974-02-05
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Expires: 1991-01-06
Abstract
Abstract A motor actuated shock absorbing bumper has an improvement upon a variable rate spring used to absorb the energy of a collision, the improvement comprising a rate control for the spring, and means operated as a function of the speed of the vehicle for controlling the setting of the rate control such that the higher the speed at which a collision occurs, the stiffer the spring becomes. In its preferred form, the rate control comprises a piston, and the speed control comprises a variable pressure pump driven from the vehicle transmission output shaft and supplying liquid to the piston at a pressure which increases with the speed of the output shaft.
Inventors
- 👤 J Hrebicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:25
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/36; B60R19/28; B60R2019/262; B60R2019/266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
In combination a spring, an abutment for the spring, an active element adapted to engage the spring to expand or contract said spring against said abutment, a variable speed shaft, means intermediate the abutment and spring and movable as a function of the speed of said shaft for changing the position of said abutment relative to said spring, and telescoping guide means connecting the active element and the abutment, and means for retarding the movement of said telescoping guide means as a function of the speed of said shaft.
Claim 2
Dependent Claim
89 words
In combination a spring, an abutment for the spring, an active element adapted to engage the spring to expand or contract said spring against said abutment, a variable speed shaft, means intermediate the abutment and spring and movable as a function of the speed of said shaft for changing the position of said abutment relative to said spring, and telescoping guide means connecting the active element and the abutment, and means for retarding the movement of said telescoping guide means as a function of the speed of said shaft.
References Cited (Backward Citations)
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Cited
US2877011A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |