Patent US3847446A successfully refreshed from Google Patents.
US3847446A
Expired / Lapsed
US
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Skid control system for tandem axled vehicles
Assignee: ZF Active Safety US Inc
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Filing: 1971-12-23
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Granted: 1974-11-12
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Expires: 1991-12-23
Abstract
Abstract A skid control system common to a pair of closely spaced wheels located on closely spaced axles, such as in a tandem axle arrangement with the pair of wheels being those on the same side of a vehicle, the system comprising a control module providing an output signal in response to the eminence or occurrence of a skid condition at one or both of the wheels, and an actuating device responsive to the output signal for controlling the fluid pressure to the brakes of both, with the control module and/or actuating device including major portions, such as a common actuator, which serve to control the brakes at both of the pair of wheels whereby an economical system can be realized.
Inventors
- 👤 R Scharlack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:03
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1708
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A skid control system for a pair of tandemly located, proximately spaced, fore and aft wheels of a wheeled vehicle having a pressurized fluid actuated braking system comprising: control means for detecting the occurrence of an incipient wheel skid condition at at least one of the wheels and providing an output signal in response thereto, said control means including a sensor means located at only one of said fore and aft wheels for providing rotational speed information, and control module means for receiving said information and providing said output signal in response to said information; and common actuating means responsive to said output signal for controlling the pressure to the brakes at both of the fore and aft wheels.
Claim 2
Dependent Claim
119 words
A skid control system for a pair of tandemly located, proximately spaced, fore and aft wheels of a wheeled vehicle having a pressurized fluid actuated braking system comprising: control means for detecting the occurrence of an incipient wheel skid condition at at least one of the wheels and providing an output signal in response thereto, said control means including a sensor means located at only one of said fore and aft wheels for providing rotational speed information, and control module means for receiving said information and providing said output signal in response to said information; and common actuating means responsive to said output signal for controlling the pressure to the brakes at both of the fore and aft wheels.
Claim 3
Dependent Claim
17 words
The system as recited in claim 1 wherein said sensor means is located at said fore wheel.
Claim 4
Dependent Claim
65 words
The system as recited in claim 1 wherein said common actuating means is an electrically operated valve responsive to said output signal, said valve having a first position wherein pressurized fluid is communicated to the brakes of both of the fore and aft wheels and a second condition wherein the pressurized fluid is relieved to the brakes of both of the fore and aft wheels.
Claim 5
Dependent Claim
39 words
The system as recited in claim 3, for use with a vehicle having a pair of front steerable wheels in combination with individual front skid control means for independently controlling the brakes for each of said front steerable wheels.
Claim 6
Dependent Claim
108 words
A skid control system for a pair of tandemly located, proximately spaced, fore and aft wheels of a wheeled vehicle having a pressurized fluid actuated braking system comprising: control means for detecting the occurrence of an incipient wheel skid condition, said control means including a pair of sensors for providing rotational speed information of both the fore and aft wheels; control module means for receiving said information and providing an electrical output signal in response to a preselected average of said rotational speed information; and common actuating means Responsive to said output signal for controlling the pressure to the brakes of both of the fore and aft wheels.
Claim 7
Dependent Claim
108 words
A skid control system for a pair of tandemly located, proximately spaced, fore and aft wheels of a wheeled vehicle having a pressurized fluid actuated braking system comprising: control means for detecting the occurrence of an incipient wheel skid condition, said control means including a pair of sensors for providing rotational speed information of both the fore and aft wheels; control module means for receiving said information and providing an electrical output signal in response to a preselected average of said rotational speed information; and common actuating means Responsive to said output signal for controlling the pressure to the brakes of both of the fore and aft wheels.
Claim 8
Dependent Claim
65 words
The system as recited in claim 5 wherein said common actuating means is an electrically operated valve responsive to said output signal, said valve having a first position wherein pressurized fluid is communicated to the brakes of both of the fore and aft wheels and a second condition wherein the pressurized fluid is relieved to the brakes of both of the fore and aft wheels.
Claim 9
Dependent Claim
39 words
The system as recited in claim 6 for use with a vehicle having a pair of front steerable wheels in combination with individual front skid control means for independently controlling the brakes for each of said front steerable wheels.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |