US3735343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake lining wear warning system
Assignee: Avco Corp
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Filing: 1971-08-12
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Granted: 1973-05-22
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Expires: 1991-08-12
Abstract
Abstract A brake lining wear warning system for indicating when brake linings are dangerously worn and require replacement and provides a warning signal to a vehicle operator when the brake lining has worn a predetermined amount. Engagement of a detector with the brake drum initiates an operator warning signal.
Inventors
- 👤 B Lane
- 👤 D Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:09
CPC Classifications
F; F16; F16D; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023; F16D66/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A brake lining wear warning system comprising in combination: a brake drum; a brake shoe selectively actuated to a brake applying position; a brake lining mounted on a portion of the surface of said brake shoe and arranged to engage said brake drum in the brake applying position; a lining wear detector mounted adjacent said lining on the portion of said brake shoe surface not covered by said brake lining, said detector having a predetermined thickness wherein said detector will engage said brake drum in the brake applying position after a predetermined amount of lining wear; an electrical power source; signal means electrically connected with said power source and said wear detector wherein contact of said wear detector with said brake drum enables said signal means to indicate that said lining has worn a predetermined amount.
Claim 2
Dependent Claim
136 words
A brake lining wear warning system comprising in combination: a brake drum; a brake shoe selectively actuated to a brake applying position; a brake lining mounted on a portion of the surface of said brake shoe and arranged to engage said brake drum in the brake applying position; a lining wear detector mounted adjacent said lining on the portion of said brake shoe surface not covered by said brake lining, said detector having a predetermined thickness wherein said detector will engage said brake drum in the brake applying position after a predetermined amount of lining wear; an electrical power source; signal means electrically connected with said power source and said wear detector wherein contact of said wear detector with said brake drum enables said signal means to indicate that said lining has worn a predetermined amount.
Claim 3
Dependent Claim
66 words
The combination as set forth in claim 1 in which said wear detector comprises a first contact and a second contact, said contacts being electrically separated, said first contact being conNected with the power source and said second contact being connected with said signal means wherein engagement of said brake drum with said first and second contacts provides electrical continuity therebetween to enable said signal means.
Claim 4
Dependent Claim
56 words
The combination as set forth in claim 2 in which said first and second contacts comprise soft metallic elements of a predetermined thickness, said elements being mounted on a non-conductive strip, and in which non-conductive strip is secured to said brake shoe on the portion of said brake shoe surface not covered by said brake lining.
Claim 5
Dependent Claim
46 words
The combination according to claim 2 in which said first and second contacts are metallic strips of anodized aluminum to electrically isolate one strip from the other and each strip from said brake shoe and in which said strips are secured directly to said brake shoe.
Claim 6
Dependent Claim
76 words
The combination as set forth in claim 1 in which said signal means is a lamp and further comprising a silicon controlled rectifier electrically connected between said lamp and said wear detector, said silicon controlled rectifier normally being in a non-conducting state and being switched to the conducting state in response to said brake drum engaging said wear detector wherein said lamp is enabled by the switching of said silicon controlled rectifier to the conducting state.
Claim 7
Dependent Claim
50 words
The combination as set forth in claim 5 in which an wear detector is associated with each wheel of a vehicle, and in which a separate lamp and control means is associated with each wear detector wherein one lamp indicates the condition of the brake lining for a given wheel.
Claim 8
Dependent Claim
46 words
The combination as set forth in claim 5 in which an wear detector is associated with each wheel of a vehicle, said wear detectors being electrically connected to a common lamp and control means wherein said lamp is enabled by any one of said wear detectors.
Claim 9
Dependent Claim
24 words
The combination as set forth in claim 1 in which said wear detector is mounted substantially on the upper surface of said brake shoe.
References Cited (Backward Citations)
US3456236A
Cited
US3440604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |