US3827761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive antiskid device with safety apparatus
Assignee: Aisin Corp
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Filing: 1972-09-25
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Granted: 1974-08-06
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Expires: 1992-09-25
Abstract
Abstract An automotive antiskid device having safety apparatus which includes a brake fluid pressure control apparatus disposed within a fluid pressure circuit from a master cylinder to the wheel cylinders and controlling the brake pressure to the wheel cylinders in accordance with a skid signal, fluid pressure detecting apparatus formed upon both sides of the master cylinder and the wheel cylinders, respectively, and operating according to the fluid pressure within the fluid pressure circuit, a safety apparatus automatically operating in accordance with the state of the fluid pressure detecting apparatus, and an electromagnetic fluid pressure cut-off apparatus disposed within the master cylinder and wheel cylinder fluid circuit in parallel with the brake fluid pressure control apparatus and being controlled by the safety apparatus.
Inventors
- 👤 M Inada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:12
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T11/00; B60T11/10; B60T11/28; B60T11/34; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T8/343; B60T8/344; B60T8/347; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
187 words
An apparatus for antiskid brake pressure control in a hydraulic wheel brake system of an automotive vehicle with wheels, comprising in combination of: a master brake cylinder; a plurality of brake wheel cylinders for fluid connection with said master cylinder; a plurality of sensors for detecting the number of rotations of said wheels; an antiskid fluid pressure control means disposed within a first fluid pressure circuit between said master cylinder and said wheel cylinders and controlling the brake pressure to said wheel cylinders responsive to a signal from said sensors; fluid pressure responsive switching means disposed within said master cylinder and said wheel cylinders and operating according to the fluid pressure within said circuit; safety means automatically actuated in accordance with the state of said fluid pressure responsive switching means; and electromagnetic fluid pressure cut-off means disposed within a second fluid circuit between said master cylinder and said wheel cylinders and operating according to said fluid pressure responsive switching means and being controlled by said safety means, whereby the normal braking actuation is obtained in the event of a breakdown in said antiskid fluid pressure control means.
Claim 2
Independent Claim
187 words
An apparatus for antiskid brake pressure control in a hydraulic wheel brake system of an automotive vehicle with wheels, comprising in combination of: a master brake cylinder; a plurality of brake wheel cylinders for fluid connection with said master cylinder; a plurality of sensors for detecting the number of rotations of said wheels; an antiskid fluid pressure control means disposed within a first fluid pressure circuit between said master cylinder and said wheel cylinders and controlling the brake pressure to said wheel cylinders responsive to a signal from said sensors; fluid pressure responsive switching means disposed within said master cylinder and said wheel cylinders and operating according to the fluid pressure within said circuit; safety means automatically actuated in accordance with the state of said fluid pressure responsive switching means; and electromagnetic fluid pressure cut-off means disposed within a second fluid circuit between said master cylinder and said wheel cylinders and operating according to said fluid pressure responsive switching means and being controlled by said safety means, whereby the normal braking actuation is obtained in the event of a breakdown in said antiskid fluid pressure control means.
Claim 3
Dependent Claim
122 words
Apparatus as set forth in claim 1, wherein said safety means comprises in combination: an accessory switch of said vehicle; a key switch maintaining the on-state in cooperation with said accessory switch during vehicle driving; a plurality of AND elements issuing an output only when two inputs issue an on-state; a plurality of delay elements operating only when an input is switched from an on-state to an off-state; a plurality of timing elements for maintaining said on-state for a prescribed time after said input is changed from an off-state to an on-state and thereafter operating for maintaining said off-state without regard to said input; and a plurality of amplification elements for amplifying said inputs and driving said electromagnetic fluid pressure cut-off means.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |