Patent US3572472A successfully refreshed from Google Patents.
US3572472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency brake system for a vehicle
Assignee: Individual
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Filing: 1969-04-21
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Granted: 1971-03-30
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Expires: 1989-04-21
Abstract
Abstract A parking brake for a motor vehicle is actuated by reduced pressure or vacuum from the engine intake manifold which will compress a spring to release the brakes. When the vacuum is shut off the spring will expand and will apply the brakes to the vehicle. When the spring is compressed and the brakes are released, a pawl will engage and secure the spring in compression to prevent inadvertent application of the brakes if the manifold vacuum is reduced.
Inventors
- 👤 Edward R Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:39
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
256 words
Apparatus for setting and releasing emergency brakes of a vehicle, said apparatus comprising: a source of vacuum; a vacuum chamber including: a diaphragm which is clamped and held rigidly at the periphery thereof; and an actuation rod clamped to the center of the diaphragm and movable axially; a control valve pneumatically coupled between the source of vacuum and the vacuum chamber on a first side of said diaphragm for selectively venting the chamber to the atmosphere and evacuating the chamber; a first biasing spring mechanically coupled to the actuation rod for urging the actuation rod to a first position for setting the brakes; a pawl for securing the actuation rod in a second position for releasing the brakes; restrictive passages for passing air into and out of the vacuum chamber whereby the movement of the actuation rod will be smooth and gradual to set and release the brakes smoothly and gradually; said actuation rod being operable to release the brakes when vacuum is applied to the first side of the diaphragm in the vacuum chamber whereby air of atmospheric pressure will move the diaphragm and actuation rod to compress the spring; and a second bias spring coupled to the pawl for urging said pawl into engagement with said actuation rod when in said second position for maintaining the brakes in the released state, said control valve being coupled to the bias spring and to the pawl for releasing the pawl when the vacuum chamber on the first side of the diaphragm is vented to the atmosphere.
Claim 2
Dependent Claim
256 words
Apparatus for setting and releasing emergency brakes of a vehicle, said apparatus comprising: a source of vacuum; a vacuum chamber including: a diaphragm which is clamped and held rigidly at the periphery thereof; and an actuation rod clamped to the center of the diaphragm and movable axially; a control valve pneumatically coupled between the source of vacuum and the vacuum chamber on a first side of said diaphragm for selectively venting the chamber to the atmosphere and evacuating the chamber; a first biasing spring mechanically coupled to the actuation rod for urging the actuation rod to a first position for setting the brakes; a pawl for securing the actuation rod in a second position for releasing the brakes; restrictive passages for passing air into and out of the vacuum chamber whereby the movement of the actuation rod will be smooth and gradual to set and release the brakes smoothly and gradually; said actuation rod being operable to release the brakes when vacuum is applied to the first side of the diaphragm in the vacuum chamber whereby air of atmospheric pressure will move the diaphragm and actuation rod to compress the spring; and a second bias spring coupled to the pawl for urging said pawl into engagement with said actuation rod when in said second position for maintaining the brakes in the released state, said control valve being coupled to the bias spring and to the pawl for releasing the pawl when the vacuum chamber on the first side of the diaphragm is vented to the atmosphere.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |