Patent US4003605A successfully refreshed from Google Patents.
US4003605A
Expired / Lapsed
US
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Fluid pressure braking system with limiting valve for anti-compounding and fail-safe standby valve
Assignee: Bendix Corp
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Filing: 1975-11-28
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Granted: 1977-01-18
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Expires: 1995-11-28
Abstract
Abstract A fluid pressure braking system for a vehicle having brake actuators which may be mechanically held in the brake-applied position when the vehicle is parked and which may be actuated from either service or emergency actuating systems, is provided with a fluid communication limiting valve which limits fluid communication through the service actuating system to the brake actuators when the actuators have been actuated by the emergency system, thereby providing an "anti-compounding" capability so that the brake actuators cannot be actuated by the combined full capacities of both actuating systems. The system further includes a standby valve which is responsive to a normal brake application to communicate fluid pressure to the actuators through the emergency system when the failure of the primary fluid pressure system prevents communication to the actuators through the service system.
Inventors
- 👤 Richard C. Fannin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:41
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/268; B60T13/261; B60T17/00; B60T17/08; B60T17/16; B60T17/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
188 words
In a vehicle fluid pressure braking system having first and second service braking systems and a parking braking system, a first set of brake actuators connected in said first service braking system and a second set of actuators connected in said second service system, brake valve means for communicating fluid pressure in said first and second service braking systems when a brake actuation is effected, said first set of brake actuators including emergency actuation means for actuating said first set of brake actuators upon failure of said first service braking system, said emergency actuation means including emergency valve means having a control port communicated in said first service braking system, an inlet port communicated through said brake valve means to said second service braking system so that upon actuation of said brake valve means fluid communication to said inlet port from said second service braking system is permitted, and an outlet port for communicating fluid pressure to actuate said emergency actuation means, said emergency valve means being responsive to failure of the fluid pressure level at the control port to permit communication between the inlet and outlet ports.
Claim 2
Dependent Claim
188 words
In a vehicle fluid pressure braking system having first and second service braking systems and a parking braking system, a first set of brake actuators connected in said first service braking system and a second set of actuators connected in said second service system, brake valve means for communicating fluid pressure in said first and second service braking systems when a brake actuation is effected, said first set of brake actuators including emergency actuation means for actuating said first set of brake actuators upon failure of said first service braking system, said emergency actuation means including emergency valve means having a control port communicated in said first service braking system, an inlet port communicated through said brake valve means to said second service braking system so that upon actuation of said brake valve means fluid communication to said inlet port from said second service braking system is permitted, and an outlet port for communicating fluid pressure to actuate said emergency actuation means, said emergency valve means being responsive to failure of the fluid pressure level at the control port to permit communication between the inlet and outlet ports.
Claim 3
Dependent Claim
82 words
The invention of claim 1: said parking system including valve mechanism for controlling communication therethrough; said valve mechanism being shiftable between a vehicle operating position and a vehicle parking position, and release valve means responsive solely to shifting of said valve mechanism from said vehicle parking position to said vehicle operating position to communicate fluid pressure to said emergency actuation means until a predetermined pressure level is attained at said service port whereupon said release valve means vents said emergency actuation means.
Claim 4
Dependent Claim
89 words
The invention of claim 2: said brake actuator including fluid pressure controlled locking mechanism communicated to a locking port for locking said actuator in a brake-applied condition, said parking system including valve mechanism for controlling communication therethrough, said valve mechanism being shiftable between a vehicle operating position and vehicle parking position and parking valve means responsive to movement of said valve mechanism from said operating position to said parking position to vent the fluid pressure level communicated to said locking port and communicating fluid pressure to said emergency port.
Claim 5
Dependent Claim
171 words
In a vehicle fluid pressure braking system, a brake actuator having a service port connected to a fluid pressure source when a service brake application is effected and fluid pressure responsive parking means for holding the actuator in a brake-applied condition when a parking application is effected, and limiting valve means limiting fluid pressure communication to said service port upon actuation of said parking means, said limiting valve means being responsive to fluid pressure communication to said parking means to permit substantially uninhibited fluid communication to said service port when the parking means is released and to limit communication to said service port when the parking means is actuated, said limiting valve means including an inlet port communicated to said fluid pressure source, an outlet port controlling communication to said service port, and a control port, said limiting valve means being responsive to the fluid pressure level at said control port to establish a fluid pressure level at the outlet port less than the fluid pressure level at the inlet port.
Claim 6
Dependent Claim
171 words
In a vehicle fluid pressure braking system, a brake actuator having a service port connected to a fluid pressure source when a service brake application is effected and fluid pressure responsive parking means for holding the actuator in a brake-applied condition when a parking application is effected, and limiting valve means limiting fluid pressure communication to said service port upon actuation of said parking means, said limiting valve means being responsive to fluid pressure communication to said parking means to permit substantially uninhibited fluid communication to said service port when the parking means is released and to limit communication to said service port when the parking means is actuated, said limiting valve means including an inlet port communicated to said fluid pressure source, an outlet port controlling communication to said service port, and a control port, said limiting valve means being responsive to the fluid pressure level at said control port to establish a fluid pressure level at the outlet port less than the fluid pressure level at the inlet port.
Claim 7
Dependent Claim
36 words
The invention of claim 4; and a parking system for controlling said parking means, said parking system including valve mechanism for controlling communication to said parking means, said control port being communicated to said valve mechanism.
Claim 8
Dependent Claim
57 words
The invention of claim 5: said brake actuator having an emergency port communicated to said parking system, and fluid pressure controlled locking mechanism including a locking port communicated to said parking system for locking said actuator in a brake-applied position when a parking application is effected, said valve mechanism controlling communication to said locking and emergency ports.
Claim 9
Dependent Claim
70 words
The invention of claim 6: said valve mechanism being shiftable between a vehicle operating position and a vehicle parking position, and release valve means responsive solely to shifting of said valve mechanism from said vehicle parking position to said vehicle operating position to communicate fluid pressure to said service port until a predetermined pressure level is attained at said service port whereupon said release valve means vents said service port.
Claim 10
Dependent Claim
58 words
The invention of claim 6: said valve mechanism being shiftable between a vehicle operating position and a vehicle parking position, and parking valve means responsive to movement of said valve mechanism from said operating position to said parking position to vent the fluid pressure level communicated to said locking port and communicating fluid pressure to said emergency port.
Claim 11
Dependent Claim
54 words
The invention of claim 8; and release valve means responsive to shifting of said valve mechanism from said vehicle parking position to said vehicle operating position to communicate fluid pressure to said service port until a predetermined pressure level is attained at said service port whereupon said release valve means vents said service port.
Claim 12
Dependent Claim
140 words
The invention of claim 9: said fluid pressure braking system including a first service braking system communicating said source to said service port and a second service braking system separate from said first service braking system, brake valve means for simultaneously controlling communication through said service braking systems, and emergency valve means having a control port communicated in said first service braking system, an inlet port communicated through said brake valve means to said second service braking system so that upon actuation of said brake valve means fluid communication to said inlet port from said second service braking system is permitted, and an outlet port for communicating fluid pressure to said emergency port, said emergency valve means being responsive to failure of the fluid pressure level at the control port to permit communication between the inlet and outlet ports thereof.
Claim 13
Dependent Claim
139 words
The invention of claim 6: said fluid pressure braking system including a first service braking system communicating said source to said service port and a second service braking system separate from said first service braking system, brake valve means for simultaneously controlling communication through said service braking systems, and emergency valve means having a control port communicated in said first service braking system, an inlet port communicated through said brake valve means to said second service braking system so that upon actuation of said brake valve means fluid communication to said inlet port from said second service braking system is permitted, and an outlet port for communicating fluid pressure to said emergency port, said emergency valve means being responsive to failure of the fluid pressure level at the control port to permit communication between the inlet and outlet port.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |