Patent US3713708A successfully refreshed from Google Patents.
US3713708A
Expired / Lapsed
US
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Method and apparatus for the anti-skid braking of a vehicle wheel
Assignee: Fiat SpA
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Filing: 1971-01-19
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Granted: 1973-01-30
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Expires: 1991-01-19
Abstract
Abstract In anti-skid braking of a vehicle wheel, in which the braking force is decreased and increased repeatedly during one braking operation in accordance with the dynamic condition of the wheel, the braking force is each time decreased at a substantially instantaneous rate and by a fixed decrement which is not less than the value of pressure that would cause the wheel to lock when the vehicle is braked on slippery ground.
Inventors
- 👤 G Michellone
- 👤 G Maurizio
- 👤 G Calcia
- 👤 D Brandino
- 👤 M Palazzetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:48
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5087; Y; Y10; Y10S; Y10S303/00; Y10S303/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
202 words
An apparatus for the anti-skid braking of a vehicle wheel, including a source of pneumatic pressure, a brake cylinder, a line connecting the source to the brake cylinder, discharge means connected in the line and an anti-skid device connected to the discharge means and responsive to the dynamic condition of the wheel for repeatedly issuing commands to the discharge means for causing discharge of the pressure as required by the dynamic condition of the wheel during a braking operation, said apparatus further including: a. differential valve means having first and second control pressure ports, an inlet port connected to an outlet of the discharge means and an outlet port open to the atmosphere; b. a line connecting the brake cylinder to the first control pressure port of the differential valve means; c. pressure-retaining means having an inlet connected to the brake cylinder and an outlet port connected to the second control pressure port of the differential valve means; the differential valve means having a normally open passage between the inlet and the outlet ports, which is closed by the pressure in the first control port being lower by not less than a fixed amount than the pressure in the second control port.
Claim 2
Independent Claim
202 words
An apparatus for the anti-skid braking of a vehicle wheel, including a source of pneumatic pressure, a brake cylinder, a line connecting the source to the brake cylinder, discharge means connected in the line and an anti-skid device connected to the discharge means and responsive to the dynamic condition of the wheel for repeatedly issuing commands to the discharge means for causing discharge of the pressure as required by the dynamic condition of the wheel during a braking operation, said apparatus further including: a. differential valve means having first and second control pressure ports, an inlet port connected to an outlet of the discharge means and an outlet port open to the atmosphere; b. a line connecting the brake cylinder to the first control pressure port of the differential valve means; c. pressure-retaining means having an inlet connected to the brake cylinder and an outlet port connected to the second control pressure port of the differential valve means; the differential valve means having a normally open passage between the inlet and the outlet ports, which is closed by the pressure in the first control port being lower by not less than a fixed amount than the pressure in the second control port.
Claim 3
Independent Claim
202 words
An apparatus for the anti-skid braking of a vehicle wheel, including a source of pneumatic pressure, a brake cylinder, a line connecting the source to the brake cylinder, discharge means connected in the line and an anti-skid device connected to the discharge means and responsive to the dynamic condition of the wheel for repeatedly issuing commands to the discharge means for causing discharge of the pressure as required by the dynamic condition of the wheel during a braking operation, said apparatus further including: a. differential valve means having first and second control pressure ports, an inlet port connected to an outlet of the discharge means and an outlet port open to the atmosphere; b. a line connecting the brake cylinder to the first control pressure port of the differential valve means; c. pressure-retaining means having an inlet connected to the brake cylinder and an outlet port connected to the second control pressure port of the differential valve means; the differential valve means having a normally open passage between the inlet and the outlet ports, which is closed by the pressure in the first control port being lower by not less than a fixed amount than the pressure in the second control port.
Claim 4
Independent Claim
202 words
An apparatus for the anti-skid braking of a vehicle wheel, including a source of pneumatic pressure, a brake cylinder, a line connecting the source to the brake cylinder, discharge means connected in the line and an anti-skid device connected to the discharge means and responsive to the dynamic condition of the wheel for repeatedly issuing commands to the discharge means for causing discharge of the pressure as required by the dynamic condition of the wheel during a braking operation, said apparatus further including: a. differential valve means having first and second control pressure ports, an inlet port connected to an outlet of the discharge means and an outlet port open to the atmosphere; b. a line connecting the brake cylinder to the first control pressure port of the differential valve means; c. pressure-retaining means having an inlet connected to the brake cylinder and an outlet port connected to the second control pressure port of the differential valve means; the differential valve means having a normally open passage between the inlet and the outlet ports, which is closed by the pressure in the first control port being lower by not less than a fixed amount than the pressure in the second control port.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1, characterized in that the fixed amount of pressure is not less than the value of braking pressure that would cause the wheel to lock when the vehicle is moving on slippery ground.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1, characterized in that the differential valve means has a constantly open restricted passage in parallel between its inlet and outlet ports.
Claim 7
Dependent Claim
31 words
The apparatus of claim 1, characterized in that the pressure-retaining means is a parallel combination of a check valve having free passage from the inlet to the outlet and a throttle.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |