US3604762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid device
Assignee: Denso Corp
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Filing: 1969-07-16
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Granted: 1971-09-14
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Expires: 1989-07-16
Abstract
Abstract An antiskid device comprising an angular deceleration detector adapted to provide a braking force releasing signal when the angular deceleration of the wheel has exceeded a predetermined value, and a vehicle deceleration detector adapted to change said predetermined value in response to the rate of decrease in the speed of the vehicle, whereby said predetermined value is set to a lower value where the coefficient of road adhesion is low and a locked wheel is liable to occur such as in the case of a snowy frozen road surface and said predetermined value is set to a higher value where the coefficient of road adhesion is high and a locked wheel is not likely to take place, such as in the case of a dry asphalt road surface.
Inventors
- 👤 Noriyoshi Ando
- 👤 Kazu Majima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:18
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/88; B60T8/885; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633; B60T8/72; B60T8/74
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
An antiskid device for use in a vehicle having wheels and a braking system, said device comprising: wheel-speed-detecting means for generating a DC voltage proportional to wheel speed, differentiating means for differentiating said DC voltage thereby generating a wheel deceleration signal, wheel-deceleration-detecting means for generating a brake-forcereleasing signal when said deceleration signal exceeds a set value, vehicle-deceleration-detecting means for generating a vehicle deceleration signal corresponding to vehicle deceleration, set-value-changing means for changing said set value of said wheel-deceleration-detecting means in response to said vehicle deceleration signal, a switch element actuatable by said brake releasing signal, and a brake-force-releasing element for releasing a breaking force when actuated upon actuation of said switch element.
Claim 2
Dependent Claim
112 words
An antiskid device for use in a vehicle having wheels and a braking system, said device comprising: wheel-speed-detecting means for generating a DC voltage proportional to wheel speed, differentiating means for differentiating said DC voltage thereby generating a wheel deceleration signal, wheel-deceleration-detecting means for generating a brake-forcereleasing signal when said deceleration signal exceeds a set value, vehicle-deceleration-detecting means for generating a vehicle deceleration signal corresponding to vehicle deceleration, set-value-changing means for changing said set value of said wheel-deceleration-detecting means in response to said vehicle deceleration signal, a switch element actuatable by said brake releasing signal, and a brake-force-releasing element for releasing a breaking force when actuated upon actuation of said switch element.
Claim 3
Dependent Claim
61 words
An antiskid device according to claim 1 including: feedback means for applying a feedback signal to said wheel deceleration detector upon the actuation of said switching means to thereby change said predetermined value from an initial value to a higher value thus causing intermittent operation if the wheel deceleration is greater than said initial value but less than said higher value.
Claim 4
Dependent Claim
42 words
An antiskid device according to claim 2 further including: a signal delay circuit connected between said wheel deceleration detector and said switching means for passing said brake-force-releasing signal only when the duration of said brake-force-releasing signal continues over a certain predetermined time.
Claim 5
Dependent Claim
52 words
An antiskid device according to claim 2 further Including: a wheel rotation detector means for detecting whether the wheel is rotating or not after energization of said switch means and for causing the energization of said brake-force-releasing means through said switching means to be maintained by an output of said wheel-rotation-detecting circuit.
Claim 6
Dependent Claim
44 words
An antiskid device according to claim 4 further including: a signal delay circuit connected between said wheel deceleration detector and said switching means for passing said brake-force-releasing signal only when the duration of said brake-force-releasing signal continues over a certain predetermined period of time.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |