US3920281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo-stabilizing arrangement for the speeds of vehicle wheels with deliberate braking
Assignee: Individual
•
Filing: 1974-05-24
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Granted: 1975-11-18
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Expires: 1994-05-24
Abstract
Abstract An apparatus for servo-stabilizing the speeds of two wheels of a vehicle during braking thereof comprising pumps coupled to each of two wheels to be braked for producing output related to the speed of the associated wheel and a receiver member coupled to the pumps and including a pivotal blade element subject to the discharge pressures of the pumps and operative in relation to any difference between the output pressures. A distributor in the form of a three-way valve is connected to the pivotal blade to control the braking force exerted on each wheel. At the time of braking of a vehicle in a straight line, the braking forces exerted on each wheel are equalized whereas when the vehicle is braked on a curve, cams mounted on the steering shaft act on valves which provide differential effect on the pivotal blade corresponding to the different speeds of the wheels. A vehicle speed sensing device is actuated by ambient air and a brake force sensing device is coupled therewith and to the pivotal blade member for decreasing the braking action when the speed of the vehicle is above a predetermined value and the braking force exceeds a predetermined value.
Inventors
- 👤 Marcel Brun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:57
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/24; B60T8/246; B60T8/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
217 words
Apparatus for servo-stabilizing the speeds of two wheels of a vehicle during braking thereof, said apparatus comprising speed responsive means coupled to each of two wheels to be braked for producing an output signal related to the speed of the associated wheel, a receiver member coupled to said speed responsive means and including a control element which is operative in relation to any difference between the output signals of the speed responsive means, distributor means for controlling the braking force exerted on each wheel, said control element being coupled with said distributor means to control the same to establish the braking forces exerted on each wheel to equalize the speeds of the wheels at the time of braking in a straight line, means responsive to the degree of steering of the wheels and acting on said control element to counteract inequality of the output signals of the speed responsive means and provide differentiation in the speeds of the wheels when braking on a curve, vehicle speed sensing means actuated by ambient air, and brake force sensing means, said vehicle speed sensing means and said brake force sensing means being connected to said distributor means for decreasing braking action when the speed of the vehicle is above a pre-determined value and the braking force exceeds a predetermined value.
Claim 2
Dependent Claim
217 words
Apparatus for servo-stabilizing the speeds of two wheels of a vehicle during braking thereof, said apparatus comprising speed responsive means coupled to each of two wheels to be braked for producing an output signal related to the speed of the associated wheel, a receiver member coupled to said speed responsive means and including a control element which is operative in relation to any difference between the output signals of the speed responsive means, distributor means for controlling the braking force exerted on each wheel, said control element being coupled with said distributor means to control the same to establish the braking forces exerted on each wheel to equalize the speeds of the wheels at the time of braking in a straight line, means responsive to the degree of steering of the wheels and acting on said control element to counteract inequality of the output signals of the speed responsive means and provide differentiation in the speeds of the wheels when braking on a curve, vehicle speed sensing means actuated by ambient air, and brake force sensing means, said vehicle speed sensing means and said brake force sensing means being connected to said distributor means for decreasing braking action when the speed of the vehicle is above a pre-determined value and the braking force exceeds a predetermined value.
Claim 3
Dependent Claim
49 words
Apparatus as claimed in claim 1 wherein said control element is a pivotal vane, said speed responsive means comprising a pump connected to each wheel and producing an output pressure, the pressures from the pumps of the two wheels being applied in opposition to one another on said vane.
Claim 4
Dependent Claim
83 words
Apparatus as claimed in claim 2 wherein the vehicle has a steering shaft for turning the wheels, said means which is responsive to the degree of steering of the wheels comprising two cams mounted on the steering shaft, and valves acted on by said cams and controlling fluid flow from the pumps to said vane to provide differential effect for the fluid pressures acting thereon and thereby of the speed of the wheels for a given degree of steering of the steering shaft.
Claim 5
Dependent Claim
71 words
Apparatus as claimed in claim 3 comprising a reservoir connected to said pumps and to said receiver member, said brake force sensing means comprising a movable blade subjected to the fluid pressure between the receiver member and said reservoir and switch means operated by said movable blade when the fluid pressure is below a value corresponding to a braking pressure which exceeds said pre-determined value at which braking action is decreased.
Claim 6
Dependent Claim
60 words
Apparatus as claimed in claim 2 wherein said vehicle speed sensing device comprises an air inlet tube for admission of air thereinto as the vehicle is traveling, a flap valve at the end of said tube subjected to the air pressure in said tube, and swItch means closable by said flap valve when the vehicle speed exceeds said pre-determined value.
Claim 7
Dependent Claim
72 words
Apparatus as claimed in claim 5 comprising a reservoir connected to said pumps and to said receiver member, said brake force sensing means comprising a movable blade subjected to the fluid pressure between the receiver member and said reservoir and second switch means operated by said movable blade when the fluid pressure is below a value corresponding to a braking pressure which exceeds said pre-determined value at which braking action is decreased.
Claim 8
Dependent Claim
43 words
Apparatus as claimed in claim 6 comprising electro-magnetic valve means for controlling supply of pressure fluid to said distributor means, the first and second switch means being connected to said electro-magnetic valve means to operate the same when both switch means are closed.
Claim 9
Dependent Claim
64 words
Apparatus as claimed in claim 7 wherein said electromagnetic valve means is connected to said switch means and coupled to said distributor means to provide periodic actions producing a rapid succession of wheel braking operations while the speed of the vehicle has not yet reached a value at which the action ceases, the vehicle being then braked under the control of said receiver member.
Claim 10
Dependent Claim
74 words
Apparatus as claimed in claim 1 wherein said receiver member comprises a computer connected to circuit-breakers on each wheel, themselves connected to electric contacts by said vehicle speed sensing means and said brake force sensing means; said contacts being closed when the speed of the associated wheel reaches a low threshold; and electro magnetic valve means for reducing the brake action of the wheel which is running too slowly in relation to the other.
Claim 11
Dependent Claim
47 words
Apparatus as claimed in claim 9 wherein the speed differentiation means comprises a system of terminals secured to steering means for the wheels and connected to the computer so that the electromagnetic valve means provides differentiation in the speeds of the wheels when braking on a curve.
Claim 12
Dependent Claim
32 words
Apparatus as claimed in claim 10 comprising a junction box for controlling braking and supplying electrical energy for the operation of the electromagnetic valve means of each wheel only with voluntary braking.
References Cited (Backward Citations)
US3566987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |