US3787095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for unlocking a brake-locked wheel
Assignee: Robert Bosch GmbH
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Filing: 1973-02-13
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Granted: 1974-01-22
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Expires: 1993-02-13
Abstract
Abstract A sensor senses the brake-locked condition of a wheel of a motor car, and actuates a control valve to discharge fluid from the cylinder of a brake-unlocking device whose piston operates an unlocking valve in a brake fluid supply conduit so that the supply of brake fluid to the brake is interrupted, while fluid is drawn out of the supply conduit for unlocking the respective wheel. The cylinder of the unlocking device is connected with the hydropneumatic springs supporting the car body on the wheel shaft, so that the unlocking valve is held open even if the pressure of the pump or of the accumulator of the hydropneumatic springs fails.
Inventors
- 👤 Loewis Of Menar A Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:46
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/321; B60T8/328; B60T8/3285; B60T8/88; B60T8/92; B60T8/94
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
280 words
Apparatus for unlocking a brake-locked wheel comprising at least one wheel means; brake means for said wheel means including a brake having a brake cylinder, a brake fluid supply conduit connected with said brake cylinder so that locking of said wheel means by said brake means may occur; a car body; hydropneumatic spring means supporting said car body on said wheel means and including a fluid filled spring chamber; a source of pressure fluid with a pressure conduit means; discharge means; a level regulating valve means having first and second positions for connecting said spring chamber with said pressure conduit means and with said discharge means, respectively, depending on the relative displacement of said car body and said wheel means; unlocking means including an unlocking cylinder, an unlocking piston in said unlocking cylinder forming an unlocking chamber, and an unlocking valve located in said supply conduit and being opened and closed by said unlocking piston; a control conduit connecting said spring chamber with said unlocking chamber; sensor means for sensing a condition of said wheel means locked by said brake means; and control valve means in said control conduit having a normal open position connecting said fluid filled spring chamber with said unlocking chamber so that said unlocking piston holds said unlocking valve open even when said source fails, and being shifted under the control of said sensor means sensing a locked condition of said wheel means to another position connecting said unlocking chamber with said discharge means so that said unlocking piston moves said unlocking valve means to close said supply conduit while said unlocking piston draws fluid out of said brake cylinder whereby said wheel means is unlocked.
Claim 2
Dependent Claim
280 words
Apparatus for unlocking a brake-locked wheel comprising at least one wheel means; brake means for said wheel means including a brake having a brake cylinder, a brake fluid supply conduit connected with said brake cylinder so that locking of said wheel means by said brake means may occur; a car body; hydropneumatic spring means supporting said car body on said wheel means and including a fluid filled spring chamber; a source of pressure fluid with a pressure conduit means; discharge means; a level regulating valve means having first and second positions for connecting said spring chamber with said pressure conduit means and with said discharge means, respectively, depending on the relative displacement of said car body and said wheel means; unlocking means including an unlocking cylinder, an unlocking piston in said unlocking cylinder forming an unlocking chamber, and an unlocking valve located in said supply conduit and being opened and closed by said unlocking piston; a control conduit connecting said spring chamber with said unlocking chamber; sensor means for sensing a condition of said wheel means locked by said brake means; and control valve means in said control conduit having a normal open position connecting said fluid filled spring chamber with said unlocking chamber so that said unlocking piston holds said unlocking valve open even when said source fails, and being shifted under the control of said sensor means sensing a locked condition of said wheel means to another position connecting said unlocking chamber with said discharge means so that said unlocking piston moves said unlocking valve means to close said supply conduit while said unlocking piston draws fluid out of said brake cylinder whereby said wheel means is unlocked.
Claim 3
Dependent Claim
37 words
Apparatus as claimed in claim 1, wherein said sensor means is electric and produces a signal when said wheel is locked; and wherein said control valve means are electromagnetic valve means including a winding receiving said signal.
Claim 4
Dependent Claim
36 words
Apparatus as claimed in claim 1, wherein said control conduit is connected with said discharge means through said control valve means; wherein said spring chamber is connected with said discharge means through said level regulating valve.
Claim 5
Dependent Claim
14 words
Apparatus as claimed in claim 1, wherein said discharge means is one open container.
Claim 6
Dependent Claim
28 words
Apparatus as claimed in claim 4, wherein said sOurce is the only source of pressure fluid, and said open container is the only discharge container in the apparatus.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 1, wherein said source includes a pump and an accumulator for pressure fluid.
Claim 8
Dependent Claim
31 words
Apparatus as claimed in claim 1, wherein said wheel means include two wheels and a shaft connecting said wheels coaxially; and wherein said hydropneumatic spring means is mounted on said sahft.
Claim 9
Dependent Claim
71 words
Apparatus as claimed in claim 1, comprising two said wheel means and a shaft connecting said wheel means; two said breke means with two said supply conduits; two said hydropneumatic spring means mounting said car body on said shaft, two said control conduits, two sensor means and two control valve means; and only one source of pressure fluid, one pressure conduit means, one discharge means, and one level regulating valve means.
Claim 10
Dependent Claim
35 words
Apparatus as claimed in claim 8, wherein said level regulating valve means selectively connects both said spring means with said pressure conduit means and said discharge means, respectively, in said first and second positions, respectively.
Claim 11
Dependent Claim
43 words
Apparatus as claimed in claim 9, including a master brake cylinder and piston means with operator controlled means, said master brake cylinder communicating with said two brake fluid supply conduits for supplying brake fluid to said brake cylinders of said two brake means.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |