US3833269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated safety brake system
Assignee: Robert Bosch GmbH
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Filing: 1972-12-21
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Granted: 1974-09-03
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Expires: 1992-12-21
Abstract
Abstract A fluid operated brake system is controlled by two main valves operated by two electromagnetic valves, which are controlled by an electronic control device responding to signals of a sensor which senses a locked condition of the brake, requiring relieving of the pressure of the brake actuating means through a discharge conduit opened by one of the main valves. If the discharge conduit is opened due to a malfunction when braking is required, the wheel is not braked at all. A safety control valve is provided which is operated by pressure fluid under the control of one of the electromagnetic valves, to close the discharge conduit when not closed by the respective main valve due to malfunction of the respective electromagnetic valve, so that a braking force is assured.
Inventors
- 👤 J Trui
- 👤 K Riesenberg
- 👤 I Schwerin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5056; B60T8/36; B60T8/5018; B60T8/88; B60T8/92; B60T8/94
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
197 words
Fluid operated safety brake system comprising brake actuating means and brake operating means therefor; two pressure operated main valves, one of said valves having a discharge conduit, said main valves having a first position connecting said brake operating means with said brake actuating means while said one main valve closes said discharge conduit, and a second position opening said discharge conduit for relieving said brake actuating means while disconnecting said brake operating means and said brake actuating means; two electromagnetic valves for moving said main valves, respectively, between said first and second positions; at least one safety control valve means including a control piston and spring biasing means biasing said control piston to a normal position opening said discharge conduit for relieving said brake actuating means through said main valves and said discharge conduit when said one main valve is placed in said second position by one of said electromagnetic valves; and pressure conduit means controlled by said electromagnetic valves so that pressure fluid is supplied to said control valve means for moving said piston against the action of said spring means to a position closing said discharge conduit when said one main valve fails to operate.
Claim 2
Dependent Claim
197 words
Fluid operated safety brake system comprising brake actuating means and brake operating means therefor; two pressure operated main valves, one of said valves having a discharge conduit, said main valves having a first position connecting said brake operating means with said brake actuating means while said one main valve closes said discharge conduit, and a second position opening said discharge conduit for relieving said brake actuating means while disconnecting said brake operating means and said brake actuating means; two electromagnetic valves for moving said main valves, respectively, between said first and second positions; at least one safety control valve means including a control piston and spring biasing means biasing said control piston to a normal position opening said discharge conduit for relieving said brake actuating means through said main valves and said discharge conduit when said one main valve is placed in said second position by one of said electromagnetic valves; and pressure conduit means controlled by said electromagnetic valves so that pressure fluid is supplied to said control valve means for moving said piston against the action of said spring means to a position closing said discharge conduit when said one main valve fails to operate.
Claim 3
Dependent Claim
68 words
Brake system as claimed in claim 1 comprising sensing means for sensing a locked condition of a braked wheel, and generating a signal, and electronic control means receiving said signal and operating said electromagnetic valves in accordance with said signal so that said safety control valve is operated to close said discharge conduit when one of said electromagnetic valves fails to be operated by said electronic control means.
Claim 4
Dependent Claim
69 words
Brake system as claimed in claim 1 comprising a double valve having two valve seats and one valve member having two positions for cooperating with said seats, respectively, said valve member being mechanically connected with and operated by said one main valve between a discharge position, and an operative position for supplying pressure fluid to said control valve means for operating the same to move to said closed position.
Claim 5
Dependent Claim
69 words
Brake system as claimed in claim 3 wherein said double valve includes a piston having one of said valve seats, and a first spring biassing said piston and one seat toward said valve member; and wherein said one main valve includes a valve piston carrying said valve member, and a second spring biassing said valve piston to move with said valve member into abutment with said one valve seat.
Claim 6
Dependent Claim
24 words
Brake system as claimed in claim 1 comprising means operated by said control valve means for indicating the positions of said control valve means.
Claim 7
Dependent Claim
53 words
Brake system as claimed in claim 1 comprising at least oNe first limit switch operated by said control valve means; and at least one second limit switch operated by at least said one of said main valves for electrically indicating the positions of said control valve means and of said one main valve.
Claim 8
Dependent Claim
35 words
Brake system as claimed in claim 1 wherein said control valve means has a cylinder chamber for said control piston; and at least one control conduit connecting said electromagnetic valve means with said cylinder chamber.
Claim 9
Dependent Claim
30 words
Brake system as claimed in claim 7 wherein said control conduit includes a throttle valve operative during filling of said cylinder chamber, and inactive during emptying of said cylinder chamber.
Claim 10
Dependent Claim
15 words
Brake system as claimed in claim 8 wherein said throttle valve is a check valve.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |