Patent US3758168A successfully refreshed from Google Patents.
US3758168A
Expired / Lapsed
US
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Control valves for liquid pressure braking systems
Assignee: Whitnash PLC
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Filing: 1970-12-22
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Granted: 1973-09-11
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Expires: 1990-12-22
Abstract
Abstract A brake application control valve for a dual line fluid pressure braking system comprises a valve body defining two closed ended bores, two plungers, slidable in the bores, and a common actuating member for the plungers. Each bore has a fluid pressure inlet port, one outlet port for connection to a motor cylinder and another outlet port for connection to drain. Each inlet port is connected to one outlet port or the other by an annular recess in the plunger. An axial passage in the plunger connects the annular recess with the closed end of the bore. To apply brakes, the common actuating member is moved to connect the pressure source to the motor cylinders through the valve. In one form of the valve, the common actuating member acts through a beam on the plungers. When pressure at one motor cylinder is lost, the end of the beam nearer the corresponding plunger engages an abutment and the beam fulcrums about the abutment so that a greater proportion of the effort applied to the actuating member is transmitted to the other plunger. In another form of the valve, the common actuating member is guided for movement parallel to the plungers so that, when pressure is lost at one motor cylinder, the effort exerted by the driver is applied to the other valve plunger and the opposing thrust thereon is equal to the opposing thrust exerted on both valve plungers when fluid pressure was supplied to both motor cylinders.
Inventors
- 👤 D Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:23
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1812; B60T8/1831; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/141; B60T17/00; B60T17/18; B60T17/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
378 words
A brake application control valve for a fluid pressure vehicle braking system comprising two sub-systems as hereinbefore set forth, means wherein the said valve comprises two valve plungers each controlling the connection of a motor cylinder to a pressure source, a common actuating member for said valve plungers, means whereby fluid pressure transmitted to the motor cylinder exerts a thrust proportional to said fluid pressure, opposing movement of the valve plunger controlling the supply of fluid pressure thereto in a direction to effect such connection, and means whereby, in the absence of such opposing pressure on one of the valve plungers, a greater proportion of the effort applied to the actuating member by the vehicle driver is applied to the other valve plunger than is applied thereto when both actuating plungers are subjected to opposing pressure, said valve plungers being arranged with their axes in parallel side-by-side relation, and the actuating member, which is guided to move to a direction parallel to the said plungers acts on the said plungers through thrust transmitting means through which the thrust to each plunger is transmitted in line with the axis thereof, so that when there is no opposing thrust on one valve plunger, the force exerted by the driver on the actuating member is applied directly and wholly to the other valve plunger, and the fluid pressure in the other sub-system, produced by a given force exerted by the driver, is increased to increase the opposing thrust on said other valve plunger to a value substantially equal to the total opposing thrust exerted by both valve plungers when both sub-systems are operative, resilient material being interposed between the actuating member and the valve plungers, the resilient material comprising a pad one side of which engages a rigid beam interposed between said pad and the valve plungers, the opposite side of the pad being formed with two humps having their highest points in line with the plunger axes and said humps being engaged by the actuating member, the arrangement being such that a predetermined degree of deformation of the said resilient material is produced by effort exerted by the driver on the actuating member before any substantial thrust is exerted on the valve plungers, thereby facilitating smooth application of the brakes.
Claim 2
Dependent Claim
378 words
A brake application control valve for a fluid pressure vehicle braking system comprising two sub-systems as hereinbefore set forth, means wherein the said valve comprises two valve plungers each controlling the connection of a motor cylinder to a pressure source, a common actuating member for said valve plungers, means whereby fluid pressure transmitted to the motor cylinder exerts a thrust proportional to said fluid pressure, opposing movement of the valve plunger controlling the supply of fluid pressure thereto in a direction to effect such connection, and means whereby, in the absence of such opposing pressure on one of the valve plungers, a greater proportion of the effort applied to the actuating member by the vehicle driver is applied to the other valve plunger than is applied thereto when both actuating plungers are subjected to opposing pressure, said valve plungers being arranged with their axes in parallel side-by-side relation, and the actuating member, which is guided to move to a direction parallel to the said plungers acts on the said plungers through thrust transmitting means through which the thrust to each plunger is transmitted in line with the axis thereof, so that when there is no opposing thrust on one valve plunger, the force exerted by the driver on the actuating member is applied directly and wholly to the other valve plunger, and the fluid pressure in the other sub-system, produced by a given force exerted by the driver, is increased to increase the opposing thrust on said other valve plunger to a value substantially equal to the total opposing thrust exerted by both valve plungers when both sub-systems are operative, resilient material being interposed between the actuating member and the valve plungers, the resilient material comprising a pad one side of which engages a rigid beam interposed between said pad and the valve plungers, the opposite side of the pad being formed with two humps having their highest points in line with the plunger axes and said humps being engaged by the actuating member, the arrangement being such that a predetermined degree of deformation of the said resilient material is produced by effort exerted by the driver on the actuating member before any substantial thrust is exerted on the valve plungers, thereby facilitating smooth application of the brakes.
Claim 3
Dependent Claim
45 words
A brake application control valve according to claim 1 wherein a blade spring is mounted on the beam and engages the ends of the plungers the blade spring being arranged to yield during the initial application of thrust to the plungers by the actuating member.
Claim 4
Dependent Claim
380 words
A brake application control valve for a fluid pressure vehicle braking system comprising two sub-systems as hereinbefore set forth, means wherein the said valve comprises two valve plungers each controlling the connection of a motor cylinder to a pressure source, a common actuating member for said valve plungers, means whereby fluid pressure transmitted to the motor cylinder exerts a thrust proportional to said fluid pressure, opposing movement of the valve plunger controlling the supply of fluid pressure thereto in a direction to effect such connection, and means whereby, in the absence of such opposing pressure on one of the valve plungers, a greater proportion of the effort applied to the actuating member by the vehicle driver is applied to the other valve plunger than is applied thereto when both actuating plungers are subjeCted to opposing pressure, said valve plungers being arranged with their axes in parallel side-by-side relation and the actuating member which moves in a direction parallel to said plungers acts on a beam engaging, at positions spaced inwardly from its ends, with said plungers, the line of action of the actuating member being between the axes of the plungers and abutments being provided for the beam adjacent each end thereof, one of which abutments is adapted to be engaged by the beam when there is no opposing thrust on the plunger engaging the beam on the same side of the beam center as that abutment, so that the beam fulcrums about said abutment operate as a lever to transmit thrust between the actuating member and the other plunger, resilient material being interposed between the actuating member and the valve plungers, the resilient material comprising a pad one side of which engages the beam and the opposige side of which is formed with a central projection engaged by the actuating member, the arrangement being such that a predetermined degree of deformation of said resilient material is produced by effort exerted by the driver on the actuating member before any substantial thrust is exerted on the valve plungers, thereby facilitating smooth application of the brakes, a blade spring being mounted on the beam to engage the ends of the plungers, the blade spring being arranged to yield during the initial application of thrust to the plungers by the actuating member.
Claim 5
Dependent Claim
380 words
A brake application control valve for a fluid pressure vehicle braking system comprising two sub-systems as hereinbefore set forth, means wherein the said valve comprises two valve plungers each controlling the connection of a motor cylinder to a pressure source, a common actuating member for said valve plungers, means whereby fluid pressure transmitted to the motor cylinder exerts a thrust proportional to said fluid pressure, opposing movement of the valve plunger controlling the supply of fluid pressure thereto in a direction to effect such connection, and means whereby, in the absence of such opposing pressure on one of the valve plungers, a greater proportion of the effort applied to the actuating member by the vehicle driver is applied to the other valve plunger than is applied thereto when both actuating plungers are subjeCted to opposing pressure, said valve plungers being arranged with their axes in parallel side-by-side relation and the actuating member which moves in a direction parallel to said plungers acts on a beam engaging, at positions spaced inwardly from its ends, with said plungers, the line of action of the actuating member being between the axes of the plungers and abutments being provided for the beam adjacent each end thereof, one of which abutments is adapted to be engaged by the beam when there is no opposing thrust on the plunger engaging the beam on the same side of the beam center as that abutment, so that the beam fulcrums about said abutment operate as a lever to transmit thrust between the actuating member and the other plunger, resilient material being interposed between the actuating member and the valve plungers, the resilient material comprising a pad one side of which engages the beam and the opposige side of which is formed with a central projection engaged by the actuating member, the arrangement being such that a predetermined degree of deformation of said resilient material is produced by effort exerted by the driver on the actuating member before any substantial thrust is exerted on the valve plungers, thereby facilitating smooth application of the brakes, a blade spring being mounted on the beam to engage the ends of the plungers, the blade spring being arranged to yield during the initial application of thrust to the plungers by the actuating 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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |