US3834769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking system for vehicles
Assignee: Case LLC
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Filing: 1973-09-17
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Granted: 1974-09-10
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Expires: 1993-09-17
Abstract
Abstract A braking system for a heavy duty vehicle is disclosed herein. The braking system includes left and right rear brakes with individual hydraulic circuits for each brake and the circuits are arranged so that a first braking force for each of the brakes is produced when both circuits are pressurized and a second braking force that is substantially greater than the first braking force for each brake is developed when only one circuit is pressurized while the other circuit is connected to the reservoir. The braking system also incorporates left and right front brakes which are simultaneously actuated when both left and right rear brakes are actuated.
Inventors
- 👤 J Just
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:48
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T7/00; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
In a braking system for a vehicle having left and right rear brakes, an actuating system including left and right master cylinders respectively cooperating with the left and right brakes, a fluid source connected to said master cylinders, left and right circuits connecting said left and right master cylinders to the respective brakes, left and right actuators for individually moving said master cylinders between inoperative and operative positions, and means in said circuits for (1) producing a first braking force for each of said brakes when both master cylinders are in an operative position and (2) producing a second braking force substantially greater than the first braking force for each brake when one master cylinder is operative while the other master cylinder is inoperative.
Claim 2
Dependent Claim
124 words
In a braking system for a vehicle having left and right rear brakes, an actuating system including left and right master cylinders respectively cooperating with the left and right brakes, a fluid source connected to said master cylinders, left and right circuits connecting said left and right master cylinders to the respective brakes, left and right actuators for individually moving said master cylinders between inoperative and operative positions, and means in said circuits for (1) producing a first braking force for each of said brakes when both master cylinders are in an operative position and (2) producing a second braking force substantially greater than the first braking force for each brake when one master cylinder is operative while the other master cylinder is inoperative.
Claim 3
Dependent Claim
57 words
A braking system as defined in claim 1, in which said vehicle has left and right front brakes and further including an auxiliary circuit connected to said circuits for (1) actuating said front brakes when both said rear brakes are actuated simultaneously and (2) preventing actuation of said front brakes when only one rear brake is actuated.
Claim 4
Dependent Claim
60 words
A braking system as defined in claim 1, in which said means in said circuits includes a pressure intensifier connected to the associated brake in each circuit and means in each circuit for directing the fluid from the associated master cylinder to said intensifier when only one brake is actuated and bypassing said intensifier when both master cylinders are operative.
Claim 5
Dependent Claim
40 words
A braking system as defined in claim 1, in which said means in said circuits includes first and second fluid motors in each circuit and valve means in each circuit for selectively controlling the flow of fluid to one motor.
Claim 6
Dependent Claim
40 words
A braking system as defined in claim 4, in which said left and right brakes each have an actuating arm associated therewith and in which the first and second motors in each circuit are connected to an associated actuating arm.
Claim 7
Dependent Claim
97 words
A braking system as defined in claim 4, in which said left and right brakes each have an actuating arm and said means in said circuits includes a linkage system for each circuit between said actuating arm and said first and second fluid motors, and in which each linkage system has (1) a first position defining a first mechanical advantage for any forces applied to said linkage system when only one master cylinder is operative and (2) a second position defining a second mechanical advantage less than the first mechanical advantage when both master cylinders are operative.
References Cited (Backward Citations)
US2336891A
Cited
US3441319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |