US3586392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated braking systems
Assignee: Wabco Automotive UK Ltd
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Filing: 1969-04-17
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Granted: 1971-06-22
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Expires: 1989-04-17
Abstract
Abstract In a compressed air operated braking system in which the brake motors are fitted with lock actuators for parking purposes and in which a control member, after moving to effect application of the lock actuators, then moves to exhaust the brake motors, damper means are provided for limiting the rate of movement of the control member when applying the lock actuators to ensure that they are fully applied before the brake motors are exhausted.
Inventors
- 👤 Donald H Ballard
- 👤 George K Farmery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:37
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/04; B60T15/041
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
In a fluid pressure braking system, means defining a passage adapted to be connected to a source of fluid pressure, a control valve unit in said passage, a movably mounted manual lever adapted for displacement in a predetermined direction between a first position where it effects a first brake control function and a second position where it effects a second brake control function, means operably connecting said lever to said valve unit so that when the lever is in said one position said valve unit communicates fluid pressure to a pressure responsive brake lock actuator in the system, and when said lever is moved toward said second position said valve unit blocks said communication and connects said lock actuator to exhaust, and damping means operably connected to said lever for limiting the rate of movement of said lever to said second position so that said lock actuator may be substantially fully exhausted before said lever reaches said second position.
Claim 2
Dependent Claim
159 words
In a fluid pressure braking system, means defining a passage adapted to be connected to a source of fluid pressure, a control valve unit in said passage, a movably mounted manual lever adapted for displacement in a predetermined direction between a first position where it effects a first brake control function and a second position where it effects a second brake control function, means operably connecting said lever to said valve unit so that when the lever is in said one position said valve unit communicates fluid pressure to a pressure responsive brake lock actuator in the system, and when said lever is moved toward said second position said valve unit blocks said communication and connects said lock actuator to exhaust, and damping means operably connected to said lever for limiting the rate of movement of said lever to said second position so that said lock actuator may be substantially fully exhausted before said lever reaches said second position.
Claim 3
Dependent Claim
55 words
In the fluid pressure braking system defined in claim 1, said manual lever being a hand lever, a yoke on which said lever is pivotally mounted, means providing a pivot for said yoke, and means operatively connecting said control valve unit and said damping means to said yoke at opposite sides of said yoke pivot.
Claim 4
Dependent Claim
26 words
A braking system as claimed in claim 1, wherein said damping means is constructed to permit uncontrolled movement of the manual lever in the reverse direction.
Claim 5
Dependent Claim
95 words
A braking system as claimed in claim 1, wherein the damping means comprises a piston having operative connection with the manual lever and displaceable in a chamber charged with hydraulic fluid, said piston having axial passages therein and an external diameter such that a controlled clearance is provided between the piston and the chamber wall, and a flexible diaphragm at one side of the piston operable to close off the passages when the piston moves in one direction and to permit unrestricted fluid flow through the passages when the piston moves in the opposite direction.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |