US3679030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake system
Assignee: Aisin Corp
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Filing: 1970-11-17
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Granted: 1972-07-25
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Expires: 1990-11-17
Abstract
Abstract A hydraulic brake system of vehicles which comprises independent primary and secondary hydraulic circuits, two wheel cylinders attached onto each front wheel brake assembly, one of the wheel cylinders being provided with two independent hydraulic chambers therein connected with the primary and secondary fluid circuits respectively, said secondary fluid circuit being further connected with each rear wheel brake assembly, one of said hydraulic chambers which connects with the primary fluid circuit being connected with the other wheel cylinder, whereby when failure of either the primary or secondary fluid circuit occurs effective and sufficient brake force may be obtained.
Inventors
- 👤 Tsuneo Kawabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:33
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/22; B; B60; B60T; B60T11/00; B60T11/10; B60T11/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
A hydraulic brake system for vehicles comprising a master cylinder assembly including a first pressure chamber and a second pressure chamber independent of each other, a pair of front wheel brake assemblies, each including two front wheel brake cylinders, a pair of rear brake wheel assemblies, each including rear wheel brake cylinder means, one of said front wheel brake cylinders in each front wheel brake assembly having two pistons slidably mounted therein, normally contacting each other, and having different effective diameters, said pistons providing first and second wheel brake chambers independent of each other, the other of said front wheel brake cylinders in each front wheel brake assembly being provided with a third wheel brake chamber therein, said first wheel brake chamber being connected for fluid communication with said first pressure chamber of the master cylinder assembly and with said third wheel brake chamber said second wheel brake chamber being connected for fluid communication with said second pressure chamber of the master cylinder assembly and with said rear wheel brake cylinder means.
Claim 2
Dependent Claim
172 words
A hydraulic brake system for vehicles comprising a master cylinder assembly including a first pressure chamber and a second pressure chamber independent of each other, a pair of front wheel brake assemblies, each including two front wheel brake cylinders, a pair of rear brake wheel assemblies, each including rear wheel brake cylinder means, one of said front wheel brake cylinders in each front wheel brake assembly having two pistons slidably mounted therein, normally contacting each other, and having different effective diameters, said pistons providing first and second wheel brake chambers independent of each other, the other of said front wheel brake cylinders in each front wheel brake assembly being provided with a third wheel brake chamber therein, said first wheel brake chamber being connected for fluid communication with said first pressure chamber of the master cylinder assembly and with said third wheel brake chamber said second wheel brake chamber being connected for fluid communication with said second pressure chamber of the master cylinder assembly and with said rear wheel brake cylinder means.
Claim 3
Dependent Claim
28 words
A hydraulic brake system as claimed in claim 1 wherein said two pistons are provided with spherical end portions facing said first and second wheel brake chambers respectively.
Claim 4
Dependent Claim
21 words
A hydraulic brake system as claimed in claim 1 wherein the other of said front wheel brake cylinders includes one piston.
Claim 5
Dependent Claim
33 words
A hydraulic brake system as claimed in claim 1 wherein said pair of rear wheel brake assemblies each include a pair of opposed pistons adapted to separate upon application of a braking force.
Claim 6
Dependent Claim
21 words
A hydraulic brake system as claimed in claim 1 wherein said front wheel brake assemblIes are adapted for two-leading brake operation.
Claim 7
Dependent Claim
20 words
A hydraulic brake system as claimed in claim 5 wherein said rear wheel brake assemblies are adapted for leading-trailing operation.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |