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Patent US3761142A successfully refreshed from Google Patents.
US3761142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnetically controlled fluid-pressure systems
Assignee: Siemens Mobility Ltd
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Filing: 1971-12-02
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Granted: 1973-09-25
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Expires: 1991-12-02
Abstract
Abstract An electro-magnetically controlled fluid-pressure braking system the normal manner of operation of which is by selective energisation of electro-magnetic valves selectively to apply fluid-pressure to a multi-diaphragm stack; the system being alternatively operable in the event of loss of electro-magnetic control by applying fluid-pressure directly to the diaphragm stack through what is normally the exhaust parts of the stack.
Inventors
- 👤 E Williams
- 👤 T Turner
- 👤 P Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:07
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1893; B60T13/00; B60T13/10; B60T13/66; B60T13/665
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
172 words
A fluid pressure braking systems having a plurality of electro-magnetically controlled first valves each controlling communication between a first fluid-pressure inlet port, a first outlet port, and a first exhaust port associated with each of the first valves; multiple pressure-responsive members of differing effective areas operatively controlling a second valve which itself controls communication between a second fluid-pressure inlet port, a second outlet port connected to a brake cylinder, and a second exhaust port; the said first outlet ports communicating one with one side of each of the pressure responsive members and each of the inlet ports being connected to fluid pressure source means; and a third valve movable between first and second conditions, said third valve being normally in its first condition in which it connects the first said exhaust ports to atmosphere and wherein in its second condition it closes such connection of the first exhaust ports to atmosphere and instead connects a fluid-pressure source means to the said first exhaust ports and therethrough to the said first outlet ports.
Claim 2
Dependent Claim
172 words
A fluid pressure braking systems having a plurality of electro-magnetically controlled first valves each controlling communication between a first fluid-pressure inlet port, a first outlet port, and a first exhaust port associated with each of the first valves; multiple pressure-responsive members of differing effective areas operatively controlling a second valve which itself controls communication between a second fluid-pressure inlet port, a second outlet port connected to a brake cylinder, and a second exhaust port; the said first outlet ports communicating one with one side of each of the pressure responsive members and each of the inlet ports being connected to fluid pressure source means; and a third valve movable between first and second conditions, said third valve being normally in its first condition in which it connects the first said exhaust ports to atmosphere and wherein in its second condition it closes such connection of the first exhaust ports to atmosphere and instead connects a fluid-pressure source means to the said first exhaust ports and therethrough to the said first outlet ports.
Claim 3
Dependent Claim
44 words
A braking system as claimed in claim 1, including means for normally holding the third valve in its first condition by a fluid-pressure pertaining in a brake pipe and releasing it therefrom to its second condition by a variation in that brake pipe pressure.
Claim 4
Dependent Claim
62 words
A braking system as claimed in claim 2, wherein the last said means includes means for urging the third valve into its second condition by resilient means held inoperative so long as the brake pipe pressure is at or near its normal pressure but rendered operative to move the valve into its second condition by said variation in the brake pipe pressure.
Claim 5
Dependent Claim
38 words
A braking system as claimed in claim 3, wherein the third valve has a pressure-responsive member to one side of which the brake-pipe pressure is applicable and on the other side of which the resilient means is operative.
Claim 6
Dependent Claim
25 words
A braking system according to claim 1, including a choke in the connection between the fluid pressure source and the second fluid pressure inlet port.
Claim 7
Dependent Claim
50 words
A braking system as claimed in claim 5, wherein there is provided a normally-closed by-pass means for by-passing the choke, which by-pass means is openable to permit by-passing of the choke only when the said third valve is operative to connect the fluid-pressure source means to the first exhaust ports.
Claim 8
Dependent Claim
53 words
A braking system as claimed in claim 6, including a pressure-responsive member in the by-pass means positioned to open the by-pass, and said third valve including means for applying fluid pressure to said pressure-responsive member to open the by-pass when the third valve connects the fluid-pressure source means to the first exhaust ports.
Claim 9
Dependent Claim
33 words
A braking system as claimed in claim 7, wherein the by-pass means includes a normally-closed valve openable to open the by-pass member when fluid-pressure is applied through the third valve the pressure-responsive member.
Claim 10
Dependent Claim
30 words
A braking system according to claim 1, wherein the fluid-pressure source means includes means for varying the fluid-pressure in dependence upon the load of a vehicle having the braking system.
Claim 11
Dependent Claim
101 words
A braking system according to claim 1, including, isolating means having a normal first condition in which the isolating means provides a first path forming part of the connection between the fluid-pressure source means and the inlet ports of the first valves and a second path providing part of the connection between the exhaust ports of the first valves and atmosphere, the isolating means being movable to a second condition in which both of these paths are closed and a third path is opened connecting the fluid-pressure source means through the third path to the inlet ports of the first valve.
Claim 12
Dependent Claim
31 words
A braking system as claimed in claim 10, wherein the isolating means is manually operablE and includes, valves one in each of the paths, and means for mechanically interlinking the valves.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |