Patent US3882959A successfully refreshed from Google Patents.
US3882959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for car brake system
Assignee: Safety Drive Industrial Co Ltd
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Filing: 1973-04-30
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Granted: 1975-05-13
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Expires: 1993-04-30
Abstract
Abstract An auxiliary safety device for a car brake system comprising an electro-magnetic operated plunger operable to open and close a brake fluid channel by energizing selectively coils having opposite polarities. The safety device can be operated to detect leakage of brake fluid, reinforce braking performance, and protect the car from theft.
Inventors
- 👤 Ching-Chang Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:17
CPC Classifications
B; B60; B60R; B60R25/00; B60R25/01; B60R25/08; B60T; B60T17/00; B60T17/08; B60T17/16; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/88022; Y10T137/8803
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
An auxiliary safety device for a car brake system comprising a center core of insulation material having a hole therethrough, a plunger slidably disposed longitudinally through the core hole, a pair of coils disposed at each side of the said core operable to give opposite polarities, and a main inlet and a main outlet, said coils be adapted to be selectively energized to produce an electromagnet effect to operate the plunger to open or close a brake fluid flow channel which starts from the main inlet and extends through a center path of the plunger toward the main outlet, said device being operable to detect leakage or loss of brake fluid pressure, reinforce brake power, and protect the car from theft.
Claim 2
Dependent Claim
121 words
An auxiliary safety device for a car brake system comprising a center core of insulation material having a hole therethrough, a plunger slidably disposed longitudinally through the core hole, a pair of coils disposed at each side of the said core operable to give opposite polarities, and a main inlet and a main outlet, said coils be adapted to be selectively energized to produce an electromagnet effect to operate the plunger to open or close a brake fluid flow channel which starts from the main inlet and extends through a center path of the plunger toward the main outlet, said device being operable to detect leakage or loss of brake fluid pressure, reinforce brake power, and protect the car from theft.
Claim 3
Dependent Claim
57 words
Safety device for a car brake system according to claim 1, wherein the two coils are wound on insulated spools respectively on different sides of the center core, and when energized, give said opposite polarities, a first coil being operable for opening the fluid channel and the second coil being operable for closing of the fluid channel.
Claim 4
Dependent Claim
33 words
Safety device for a car brake system according to claim 2, wherein a first switch is provided to energize the first coil and a second switch is provided to energize the second coil.
Claim 5
Dependent Claim
43 words
Safety device for a car brake system according to claim 1, wherein the plunger has a center stem of smaller diameter and inlet and outlet heads of larger diameter, the fluid channel passing all the way through from the inlet to outlet heads.
Claim 6
Dependent Claim
31 words
Safety device for a car brake system according to claim 1, wherein the main outlet has a spring biased pin to serve as a check to back flow of brake fluid.
Claim 7
Dependent Claim
64 words
Safety device for a car brake system according to claim 4, wherein the outlet head has a cavity in its center providing a check to back flow of fluid when the brake is in deadlock position, and there is provided at the end of the outlet head a recess for retaining a further check means including a pin protruding out from the main outlet.
Claim 8
Dependent Claim
40 words
Safety device for a car brake system according to claim 4, wherein two grooves are provided on the plunger stem, and a spring biased ball check is provided in the core body to ensure the working positions of the plunger.
Claim 9
Dependent Claim
28 words
Safety device for a car brake system according to claim 1, wherein the whole device is encased in a casing having inlet and outlet mains and electric terminals.
Claim 10
Dependent Claim
28 words
Safety device for a car brake system according to claim 1, wherein the device is mounted on a car chassis with a bracket and covered with a hood.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |