US3871718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control device for railway vehicles
Assignee: Knorr Bremse GmbH
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Filing: 1974-04-09
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Granted: 1975-03-18
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Expires: 1994-04-09
Abstract
Abstract A brake control device includes a bellows or the like for measuring the pressure in the brake cylinder and a coded device which generates actual value signals corresponding to the measured pressure. These actual value signals together with control signals as reference value signals corresponding to a selected braking stage are introduced into a logic comparator. An output signal is generated from the comparator to control at least two solenoid valves for introducing air into the brake cylinder and for venting the brake cylinder in accordance with a selected braking stage.
Inventors
- 👤 Hans-Jorg Wurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:24
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T8/266; B60T13/00; B60T13/10; B60T13/66; B60T13/665; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
In a brake control apparatus for railway vehicles and the like, the combination of a brake cylinder responsive to a pressure medium is selected stages of braking, adjustable means indicative of a selected braking stage for generating control signals as reference signals corresponding to a selected braking stage, means for sensing the pressure in the brake cylinder, means responsive to said pressure sensing means for generating actual value signals, means receiving said actual value signals and said reference value signals for comparing said signals and generating an output signal indicative of said comparison and means including solenoid valves responsive to said output signals for regulating the pressure medium in the brake cylinder in accordance with a selected braking stage by introducing pressure medium into the cylinder and by venting the cylinder.
Claim 2
Dependent Claim
131 words
In a brake control apparatus for railway vehicles and the like, the combination of a brake cylinder responsive to a pressure medium is selected stages of braking, adjustable means indicative of a selected braking stage for generating control signals as reference signals corresponding to a selected braking stage, means for sensing the pressure in the brake cylinder, means responsive to said pressure sensing means for generating actual value signals, means receiving said actual value signals and said reference value signals for comparing said signals and generating an output signal indicative of said comparison and means including solenoid valves responsive to said output signals for regulating the pressure medium in the brake cylinder in accordance with a selected braking stage by introducing pressure medium into the cylinder and by venting the cylinder.
Claim 3
Dependent Claim
18 words
In a brake control apparatus as claimed in claim 1 wherein said pressure sensing means comprises a bellows.
Claim 4
Dependent Claim
49 words
In a brake control apparatus as claimed in claim 1 and a lever interconnecting said pressure sensing means and said actual value signal generating means, means defining a fulcrum upon which said lever is pivoted, and means for displacing said fulcrum in response to the load on the vehicle.
Claim 5
Dependent Claim
70 words
In a brake control apparatus as claimed in claim 1 and means including a throttle and connected to the output of said comparator means for connecting said throttle in the supply line to said brake cylinder at a predetermined difference between the comparison of said reference and actual value signals to throttle the introduction of pressure medium to or to throttle the venting of pressure medium from said brake cylinder.
Claim 6
Dependent Claim
27 words
In a brake control apparatus as claimed in claim 1 wherein said pressure responsive means comprises a coded member and a scanner to scan said coded member.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |