US3862782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring brake chamber control valve
Assignee: Berg Manufacturing Co
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Filing: 1974-02-22
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Granted: 1975-01-28
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Expires: 1994-02-22
Abstract
Abstract A control valve for use in a vehicle air brake system to apply brake releasing pressure to spring-actuated brakes. The valve includes a protection valve for the vehicle service tank, as well as a check valve for protecting the vehicle emergency tank. In addition, the valve includes a piston and shuttle for controlling the passage between the vehicle emergency tank and the spring brake chambers and a check valve for bleeding trapped pressure from the service line.
Inventors
- 👤 Charles F Horowitz
- 👤 Boleslaw Klimek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:06
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/261; B60T13/265; B60T15/00; B60T15/02; B60T15/36; B60T17/00; B60T17/18
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
184 words
A valve for use in applying brake releasing pressure to spring-actuated brakes in a vehicle air brake system having a service tank and an emergency tank, said valve including a housing having an emergency tank port, a service tank port, at least one brake chamber port, an exhaust port and an air pressure inlet, first passage means in said housing between said emergency tank port and said brake chamber port, a spring-biased shuttle positioned in said first passage means for closing the same, piston means in said housing responsive to air pressure at said inlet for moving said shuttle to open said first passage means, second passage means in said housing for connecting said inlet and said service tank port, valve means spring-biased toward a closing position in said second passage means, air pressure above a predetermined level at said inlet causing said second passage valve means to open connecting said inlet and service tank ports, third passage means in said housing for connecting said inlet and said emergency tank port, and valve means spring-biased toward a closing position in said third passage means.
Claim 2
Dependent Claim
184 words
A valve for use in applying brake releasing pressure to spring-actuated brakes in a vehicle air brake system having a service tank and an emergency tank, said valve including a housing having an emergency tank port, a service tank port, at least one brake chamber port, an exhaust port and an air pressure inlet, first passage means in said housing between said emergency tank port and said brake chamber port, a spring-biased shuttle positioned in said first passage means for closing the same, piston means in said housing responsive to air pressure at said inlet for moving said shuttle to open said first passage means, second passage means in said housing for connecting said inlet and said service tank port, valve means spring-biased toward a closing position in said second passage means, air pressure above a predetermined level at said inlet causing said second passage valve means to open connecting said inlet and service tank ports, third passage means in said housing for connecting said inlet and said emergency tank port, and valve means spring-biased toward a closing position in said third passage means.
Claim 3
Dependent Claim
24 words
The structure of claim 1 further characterized by and including a diaphragm valve member associated with said exhaust port and said brake chamber port.
Claim 4
Dependent Claim
36 words
The structure of claim 2 further characterized in that said diaphragm is positioned within said first passage means, the application of air pressure from said emergency tank port causing said diaphragm to close said exhaust port.
Claim 5
Dependent Claim
46 words
The structure of claim 1 further characterized in that the valve means in said third passage means includes a piston, a seal member carried by said piston and a spring normally urging said piston and seal member to a position to close said third passage means.
Claim 6
Dependent Claim
47 words
The structure of claim 1 further characterized in that said second passage valve means includes a first piston and a second piston, spring means urging said first piston away from said second piston and urging said first piston to a closing position in said second passage means.
Claim 7
Dependent Claim
36 words
The structure of claim 5 further characterized in that said first piston is carried by said second piston and is movable relative thereto, said first piston carrying a seal member for closing said second passage means.
Claim 8
Dependent Claim
22 words
The structure of claim 5 further characterized by and including a spring urging said first and second pistons toward a closing position.
Claim 9
Dependent Claim
20 words
The structure of claim 1 further characterized by and including spring means normally biasing said piston away from said shuttle.
Claim 10
Dependent Claim
26 words
The structure of claim 8 further characterized by and including a check valve carried by said piston for connecting said first passage means to said inlet.
Claim 11
Dependent Claim
29 words
The structure of claim 9 further characterized by and including a passage connecting said inlet port and said first passage means, said piston being movable in said last-named passage.
Claim 12
Dependent Claim
25 words
The structure of claim 1 further characterized in that the piston means in said first passage means has pressure responsive areas on opposite sides thereof.
Claim 13
Dependent Claim
38 words
The structure of claim 11 further characterized in that one side of said piston means in said first passage means is in communication with said inlet, with the opposite side being in communication with said brake chamber port.
Claim 14
Dependent Claim
41 words
The structure of claim 12 further characterized in that said opposite side of saId piston means has an air pressure responsive area bearing a predetermined relationship to the air pressure responsive area of said piston means in communication with said inlet.
Claim 15
Dependent Claim
44 words
The structure of claim 13 further characterized in that the air pressure area of said piston means in communication with said inlet is on the order of about twice the air pressure area of said piston means in communication with said brake chamber port.
Claim 16
Dependent Claim
26 words
The structure of claim 1 further characterized in that said piston means in said first passage means and spring-biased shuttle are concentrically positioned within said housing.
Claim 17
Dependent Claim
44 words
The structure of claim 15 further characterized in that said shuttle carries a seal member in contact with one side of said piston means, with the area of said first piston means side outside of said seal member forming an air pressure responsive area.
Claim 18
Dependent Claim
24 words
The structure of claim 16 further characterized in that the opposite side of said first piston means forms a second air pressure responsive area.
Claim 19
Dependent Claim
36 words
The structure of claim 1 further characterized by and including a service line port in said housing in communication with said air pressure inlet, and check valve means positioned to normally close said service line port.
Claim 20
Dependent Claim
36 words
The structure of claim 18 further characterized in that said check valve means includes a valve member and a spring normally biasing said valve member to a closed position in relation to said service line port.
Claim 21
Dependent Claim
62 words
The structure of claim 1 further characterized in that said third passage means is between said service tank port and said emergency tank port, opening of the valve means in said second passage means to connect the inlet and service tank ports causing inlet air pressure to open the third passage valve means to connect the emergency tank port with the inlet.
References Cited (Backward Citations)
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US3285672A
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |