Patent EP0065269A2 successfully refreshed from Google Patents.
Patent US3788431A successfully refreshed from Google Patents.
US3788431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seat safety brake control system
Assignee: Doosan Bobcat North America Inc
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Filing: 1972-08-10
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Granted: 1974-01-29
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Expires: 1992-08-10
Abstract
Abstract A vehicle operator''s seat safety brake control combined in a vehicle hydraulic system responsive to apply the brake in the event that either the engine is not operating or the seat is not occupied, including interrelated solenoid valve, brake cylinder and vehicle ignition controls for insuring full hydraulic system pressure initially to release the brake by blocking off the vehicle hydraulic system from the brake control and for reconnecting the vehicle hydraulic system and brake control when the brake is released.
Inventors
- 👤 D York
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:32
CPC Classifications
B; B60; B60T; B60T7/00; B60T7/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A normally applied fluid actuated safety brake for vehicles having a fluid system circuit means comprising a reservoir, a fluid pump connected to the reservoir, a fluid actuated vehicle work means fluid connected to and operated by the pump, first valve means in the circuit means operatively intermediate the pump and the work means and the pump and the safety brake, an operator''s station, second valve means in the circuit means responsive to the presence or the absence of the operator, and brake actuator means responsive to a fluid pressure conditioN in the circuit means for releasing the brake when said first and second valve means are actuated to first and second positions, respectively.
Claim 2
Dependent Claim
114 words
A normally applied fluid actuated safety brake for vehicles having a fluid system circuit means comprising a reservoir, a fluid pump connected to the reservoir, a fluid actuated vehicle work means fluid connected to and operated by the pump, first valve means in the circuit means operatively intermediate the pump and the work means and the pump and the safety brake, an operator''s station, second valve means in the circuit means responsive to the presence or the absence of the operator, and brake actuator means responsive to a fluid pressure conditioN in the circuit means for releasing the brake when said first and second valve means are actuated to first and second positions, respectively.
Claim 3
Dependent Claim
25 words
A safety brake as claimed in claim 1 wherein said first valve means in said first position interrupts fluid flow to said vehicle work means.
Claim 4
Dependent Claim
27 words
A safety brake as claimed in claim 1 wherein said second valve means in said second position maintains said fluid pressure condition in said brake actuator means.
Claim 5
Dependent Claim
62 words
A safety brake as claimed in claim 2 wherein said brake actuator means is operatively connected to said first valve means to cause said valve means to be actuated to a second position when the brake actuator means is fully actuated to realease the brake, said first valve means when in said second position reopening fluid flow to said vehicle work means.
Claim 6
Dependent Claim
73 words
A safety brake as claimed in claim 4 wherein a vehicle ignition circuit is operatively connected to said brake actuator means and to said first valve means for actuating said first valve means to said first position when the ignition circuit is closed, said brake actuator means causing said ignition circuit to open upon actuation to release the brake which also causes said first valve means to be actuated to said second position.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |