US3883189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety installation for two circuit brake systems of motor vehicles
Assignee: Dr Ing HCF Porsche AG
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Filing: 1973-08-16
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Granted: 1975-05-13
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Expires: 1993-08-16
Abstract
Abstract A safety installation for a two circuit brake system of motor vehicles with two brake circuits, in which each brake circuit has its own line system and independent wheel brake cylinders; a differential piston interconnected in the main flow and constructed as pressure amplifier which forms a unit with a valve arranged on the inside thereof, is thereby coordinated to each brake circuit; the valve automatically closes and opens up the main flow as a function of pressure drop in one of the brake circuits while each pressure space of the differential pistons has a line connection to the main line.
Inventors
- 👤 Erich Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:45
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/24; B60T11/28; B60T11/32; B60T11/323
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
A safety installation for two-circuit brake systems of motor vehicles with master cylinder brake means and two brake circuit means, each brake circuit means including and independent line system with a main line and independent wheel brake cylinder means, the installation comprising: housing means, pressure space means provided in said housing means for Each brake circuit means, line means for communicating each of said pressure space means with the master cylinder brake means, differential piston means constructed as a pressure amplifier disposed in each of said pressure space means and coordinated to each brake circuit means, a throughflow bore extending through a respective differential piston means substantially coaxially with its longitudinal axis, a valve means disposed at one end of the throughflow bore of each differential piston means, the valve means being operable to automatically close or open the respective throughflow bores in dependence on a pressure drop in one of the brake circuit means, and line means for communicating the upstream side of each of the valve means in a pressure space means with the other pressure space means on the downstream side of the valve means disposed in the other pressure space means.
Claim 2
Dependent Claim
195 words
A safety installation for two-circuit brake systems of motor vehicles with master cylinder brake means and two brake circuit means, each brake circuit means including and independent line system with a main line and independent wheel brake cylinder means, the installation comprising: housing means, pressure space means provided in said housing means for Each brake circuit means, line means for communicating each of said pressure space means with the master cylinder brake means, differential piston means constructed as a pressure amplifier disposed in each of said pressure space means and coordinated to each brake circuit means, a throughflow bore extending through a respective differential piston means substantially coaxially with its longitudinal axis, a valve means disposed at one end of the throughflow bore of each differential piston means, the valve means being operable to automatically close or open the respective throughflow bores in dependence on a pressure drop in one of the brake circuit means, and line means for communicating the upstream side of each of the valve means in a pressure space means with the other pressure space means on the downstream side of the valve means disposed in the other pressure space means.
Claim 3
Dependent Claim
42 words
A safety installation according to claim 1, wherein each of said valve means is arranged coaxially in the larger piston portion of the differential piston means in such a manner that it is disposed at the inlet of a respective throughflow bore.
Claim 4
Dependent Claim
39 words
A safety installation according to claim 2, wherein a plunger means is provided fixedly arranged within each pressure space means, and wherein the valve means is movably supported in a brake fluid stream and cooperates with said plunger means.
Claim 5
Dependent Claim
28 words
A safety installation according to claim 3, wherein a cap member is provided on said housing means, and said plunger means is fixedly arranged at said cap member.
Claim 6
Dependent Claim
92 words
A safety installation according to claim 3, wherein said plunger means is constructed plate-like and is provided with throughflow bores in its plate portion, said plunger means includes a stem extending through said throughflow bore of said differential piston means within the valve means, and wherein said valve means includes a valve body, a valve seat and a spring-loaded valve ball arranged substantially centrally of said valve body, said spring-loaded valve ball cooperating with the stem of the plunger means to open and close said throughflow bore of said differential piston means.
Claim 7
Dependent Claim
16 words
A safety installation according to claim 5, wherein said housing means is a common piston housing.
Claim 8
Dependent Claim
78 words
A safety installation according to claim 6, wherein the piston housing is provided with abutment means coordinated to each differential piston means, said differential piston means abuts in the open position at a respective abutment of the piston housing and each of the respective valve balls is lifted out of its valve seat in said valve body by way of the plunger stem, the respective valve balls being supported in its respective valve seat in the closed position.
Claim 9
Dependent Claim
39 words
A safety installation according to claim 1, wherein a plunger means is provided fixedly arranged within each pressure space means, and wherein the valve means is movably supported in a brake fluid stream and cooperates with said plunger means.
Claim 10
Dependent Claim
28 words
A safety installation according to claim 8, wherein a cap member is provided on said housing means, and said plunger means is fixedly arranged at said cap member.
Claim 11
Dependent Claim
91 words
A safety installation according to claim 8, wherein said plunger means is constructed plate-like and is provided with throughflow bores in its plate portion, said plunger means includes a stem extending through said throughflow bore of said differential piston means within the valve means, and wherein said valve means includes a valve body, valve seat and a spring-loaded valve ball arranged substantially centrally of said valve body, said spring-loaded valve ball cooperating with the stem of the plunger means to open and close said throughflow bore of said differential piston means.
Claim 12
Dependent Claim
79 words
A safety installation according to claim 10, wherein the piston housing is provided with an abutment means coordinated to each differential piston means, said differential piston means abuts in the open position at a respective abutment means of the piston housing and each of the respectIve valve balls is lifted out of its valve seat in said valve body by way of the plunger stem, the respective valve ball being supported in its valve seat in the closed position.
Claim 13
Dependent Claim
16 words
A safety installation according to claim 1, wherein said housing means is a common piston housing.
References Cited (Backward Citations)
US3425222A
Cited
US3441318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |