US3755774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axle identifying brake warning system
Assignee: Federal Mogul Bremsbelag GmbH
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Filing: 1971-12-16
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Granted: 1973-08-28
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Expires: 1991-12-16
Abstract
Abstract A brake condition warning system including conductor portions mounted on linings of drum type brake shoes so that the conductors are opened when the brakes reach a predetermined wear level but can be temporarily bridged by the counter friction surface upon reapplication of the brakes. Other conductor portions are mounted on frangible supports adjacent disc brakes but, upon destruction thereof, are not bridgeable, even temporarily. The system includes two axles, each having a different kind of brake, and a signal light and switching means to turn the light on when at least one portion is opened. Reapplication of the brakes tells the driver which axle has the brake which has reached the predetermined state of wear.
Inventors
- 👤 H Wilhelmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:40
CPC Classifications
F; F16; F16D; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023; F16D66/024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
A system for providing an axle identifying warning signal indicating a predetermined wear state in a vehicle of the type having two axles which are to be braked, the system comprising the combination of first electrical conductors; means for mounting portions of said conductors in predetermined relation with the brake linings of the brakes of one axle, said means for mounting including frangible support means, which support means and the conductor portion mounted thereon are disposed to be destroyed when the predetermined wear limit is reached; second electrical conductors; means for mounting portions of said conductors in predetermined relation with the brake linings of the brakes of the second axle so that wear of the linings to said predetermined state interrupts a section of a portion and exposes the ends of the interrupted section, which ends can be temporarily electrically bridged together by engagement of the shoe with the counter friction surface; circuit means connecting said electrical conductors associated with both axles into a series circuit; a signal annunciator; a power source connectable to said circuit means; and switch means connected to said circuit means and said annunciator for activating said annunciator only when said power source is connected and at least one of said portions is removed.
Claim 2
Independent Claim
208 words
A system for providing an axle identifying warning signal indicating a predetermined wear state in a vehicle of the type having two axles which are to be braked, the system comprising the combination of first electrical conductors; means for mounting portions of said conductors in predetermined relation with the brake linings of the brakes of one axle, said means for mounting including frangible support means, which support means and the conductor portion mounted thereon are disposed to be destroyed when the predetermined wear limit is reached; second electrical conductors; means for mounting portions of said conductors in predetermined relation with the brake linings of the brakes of the second axle so that wear of the linings to said predetermined state interrupts a section of a portion and exposes the ends of the interrupted section, which ends can be temporarily electrically bridged together by engagement of the shoe with the counter friction surface; circuit means connecting said electrical conductors associated with both axles into a series circuit; a signal annunciator; a power source connectable to said circuit means; and switch means connected to said circuit means and said annunciator for activating said annunciator only when said power source is connected and at least one of said portions is removed.
Claim 3
Dependent Claim
73 words
A system according to claim 1 wherein the vehicle is provided with a first axle having disc brakes and a second axle having drum brakes, and wherein said conductor portions mounted on frangible support means are disposed on said first axle on said disc brakes, and said conductor portions interruptable by wear and which can be temporarily bridged by the counter friction surface are mounted on said second axle on said drum brakes.
Claim 4
Dependent Claim
31 words
A system according to claim 2 wherein said means for mounting includes means for adjusting the predetermined relation of said conductor portions on said second axle relative to the brake shoe.
Claim 5
Independent Claim
214 words
A system for providing an axle identifying warning signal for indicating a predetermined wear state in a vehicle having two axles which are to be braked, each axle having a different kind of brake, the system comprising: first electrical conductors; means for mounting portions of said conductors in predetermined relation with the linings of the brakes of one axle, said portions being mounted so that the wear of the brake linings to the predetermined state permits said portions of the conductors to be destroyed; second electrical conductors; means for mounting portions of said conductors in predetermined relation with the linings of the brakes of the other axle, said portions being mounted so that the wear of the brake linings to the predetermined state permits said portions of the conductors to be interrupted, and so that said interrupted section of said portions of the conductors can be temporarily bridged by engagement of the brake shoe with the counter friction surface; circuit means for interconnecting said electrical conductors of both axles; means for cooperating with said circuit means to provide a first indication when the brakes on one axle have reached the predetermined state of wear, and for providing a second indication when the brakes on the other axle have reached the predetermined state of wear.
Claim 6
Independent Claim
214 words
A system for providing an axle identifying warning signal for indicating a predetermined wear state in a vehicle having two axles which are to be braked, each axle having a different kind of brake, the system comprising: first electrical conductors; means for mounting portions of said conductors in predetermined relation with the linings of the brakes of one axle, said portions being mounted so that the wear of the brake linings to the predetermined state permits said portions of the conductors to be destroyed; second electrical conductors; means for mounting portions of said conductors in predetermined relation with the linings of the brakes of the other axle, said portions being mounted so that the wear of the brake linings to the predetermined state permits said portions of the conductors to be interrupted, and so that said interrupted section of said portions of the conductors can be temporarily bridged by engagement of the brake shoe with the counter friction surface; circuit means for interconnecting said electrical conductors of both axles; means for cooperating with said circuit means to provide a first indication when the brakes on one axle have reached the predetermined state of wear, and for providing a second indication when the brakes on the other axle have reached the predetermined state of wear.
References Cited (Backward Citations)
US3456236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |