US3910639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commuter car brake systems
Assignee: Knorr Brake Holding Corp
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Filing: 1974-11-01
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Granted: 1975-10-07
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Expires: 1994-11-01
Abstract
Abstract An electro-pneumatic brake system is disclosed for vehicles having axles with both friction and dynamic braking means and axles with friction braking means only, in which individual control valves responsive to a vehicle weight signal, a signal proportional to the dynamic braking and a friction brake pressure signal are used to apply essentially equivalent actuation pressures simultaneously to the friction brakes at all axles. Unique component arrangements are disclosed which reduce brake actuation times by minimizing pressure build-up times in the pneumatic lines of the system.
Inventors
- 👤 Thomas H Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:35
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L3/106; B60L3/108; B60L7/00; B60L7/24; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T13/44; B60T13/58; B60T13/585; B60T13/586; B60T13/66; B60T13/665; B60T13/74; B60T8/00; B60T8/18; B60T8/1893; B60T8/32; B60T8/321; B60T8/3235; B61; B61H; B61H5/00; F; F16; F16D; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D55/2245; B60L2200/00; B60L2200/26; B60L2240/00; B60L2240/10; B60L2240/26; F16D2125/00; F16D2125/02; F16D2125/026
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
An electro-pneumatic brake system for use in rail cars having at least one axle with both friction and dynamic braking means and at least one axle with only friction braking means, comprising: means for producing a first fluid pressure signal proportional to the load carried by the rail car; means for producing a first electrical signal proportional to any dynamic brake application force provided at said at least one axle with both friction and dynamic braking means; fluid pressure responsive means for simultaneously applying essentially equivalent friction braking pressure to the friction braking means at all axles; and control valve means, responsive to said first fluid pressure signal, said first electrical signal and the pressure applied to said fluid-pressure-responsive means for simultaneously applying essentially equivalent friction braking pressure, for regulating the pressure applied to said friction braking means at all said axles.
Claim 2
Dependent Claim
142 words
An electro-pneumatic brake system for use in rail cars having at least one axle with both friction and dynamic braking means and at least one axle with only friction braking means, comprising: means for producing a first fluid pressure signal proportional to the load carried by the rail car; means for producing a first electrical signal proportional to any dynamic brake application force provided at said at least one axle with both friction and dynamic braking means; fluid pressure responsive means for simultaneously applying essentially equivalent friction braking pressure to the friction braking means at all axles; and control valve means, responsive to said first fluid pressure signal, said first electrical signal and the pressure applied to said fluid-pressure-responsive means for simultaneously applying essentially equivalent friction braking pressure, for regulating the pressure applied to said friction braking means at all said axles.
Claim 3
Dependent Claim
166 words
A brake system as claimed in claim 1, wherein said means for simultaneously applying friction braking pressure comprises: at least one primary fluid motor responsive to variations in the fluid pressure received from said control valve means to actuate said friction braking means; a source of fluid pressure; at least one secondary fluid motor responsive to variations in the fluid pressure received from said source of fluid pressure; at least one spring motor means operatively connected to said friction braking means and restrained by said at least one secondary fluid motor, said spring motor being released by reductions in the pressure received from said source of fluid pressure, thereby to actuate said friction braking means; and means operatively connected to said source of fluid pressure and said secondary fluid motor for selectively accumulating pressurized fluid from said source of fluid pressure and delivering said accumulated pressurized fluid to said secondary fluid motors in the event of a loss in pressure from said source of fluid pressure.
Claim 4
Dependent Claim
143 words
A brake system as claimed in claim 2, wherein said rail cars comprise a plurality of articulated sections, the axles in some sections including both friction and dynamic braking means and in other sections including only friction braking means and wherein the means for accumulating and delivering pressurized fluid comprises: a fluid pressure line extending from said source of fluid pressure through each section and communicating with said at least one secondary, fluid motor; an accumulator reservoir communicating with said fluid pressure line via a check valve whereby pressurized fluid may be accumulated; and a three way valve communicating with said Accumulator reservoir and said fluid pressure line whereby said pressurized fluid may be delivered to said fluid pressure line for retracting said at least one spring motor means in the event of a loss in pressure from said source of fluid pressure.
Claim 5
Dependent Claim
24 words
A brake system as claimed in claim 3, wherein an accumulator reservoir and three way check valve are located in each of said sections.
Claim 6
Dependent Claim
28 words
A brake system as claimed in claim 2 further comprising means for venting said at least one secondary fluid motor to effect a parking or emergency brake application.
Claim 7
Dependent Claim
28 words
A brake system as claimed in claim 3, further comprising means for venting said at least one secondary fluid motor to effect a parking or emergency brake application.
Claim 8
Dependent Claim
28 words
A brake system as claimed in claim 4, further comprising means for venting said at least one secondary fluid motor to effect a parking or emergency brake application.
Claim 9
Dependent Claim
39 words
A brake system as claimed in claim 1, wherein said rail car comprises a plurality of articulated sections, the axles in some sections including both friction and dynamic braking means and in other sections including only friction braking means.
Claim 10
Dependent Claim
166 words
A brake system as claimed in claim 8, wherein said means for simultaneously applying friction braking pressure comprises: at least one primary fluid motor responsive to variations in the fluid pressure received from said control valve means to actuate said friction braking means; a source of fluid pressure; at least one secondary fluid motor responsive to variations in the fluid pressure received from said source of fluid pressure; at least one spring motor means operatively connected to said friction braking means and restrained by said at least one secondary fluid motor, said spring motor being released by reductions in the pressure received from said source of fluid pressure, thereby to actuate said friction braking means, and means operatively connected to said source of fluid pressure and said secondary fluid motor for selectively accumulating pressurized fluid from said source of fluid pressure and delivering said accumulated pressurized fluid to said secondary fluid motors in the event of a loss in pressure from said source of fluid pressure.
Claim 11
Dependent Claim
25 words
A brake system as claimed in claim 9, wherein a means for selectively accumulating and delivering pressurized fluid is located in each of said sections.
Claim 12
Dependent Claim
28 words
A brake system as claimed in claim 9, further comprising means for venting said at least one secondary fluid motor to effect a parking or emergency brake application.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |