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US3611283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake-wear-indicating system
Assignee: TDK Micronas GmbH
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Filing: 1969-03-07
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Granted: 1971-10-05
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Expires: 1989-03-07
Abstract
Abstract An indicating system for the wear of the lining of the brakeshoe of a disk brake in which the brakeshoe carries a contact which, upon substantial frictional erosion of the brake lining, engages a second contact resiliently during advance of the brakeshoe whereby the resilient interengagement of the contacts maintains an electrical connection after release of the brake. The contacts are connected in circuit with the warning lamp on the dashboard of the vehicle. The brakeshoe contact is a conductive member encased in a wearable (synthetic resin) insulating shell embedded in the lining material and exposed by contact with the disk, to establish an electrical connection, after a predetermined amount of brakeshoe wear. The resilient contact member of the brakeshoe lies outside the lining and engages a fixed portion of the brake housing, e.g., the spring clip holding the brakeshoes in place.
Inventors
- 👤 Hans Joachim Anders
- 👤 Heinz Hahm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:44
CPC Classifications
F; F16; F16D; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
220 words
A vehicle-brake system comprising a rotatable brake surface, a brake-housing member disposed along said rotatable brake surface, a brakeshoe having a backing plate and a pad of brakelining material mounted on said backing plate and shiftable on said housing member toward and away from said surface for frictional contact therewith, said pad having a periphery, electrical indicator means for warning a vehicle operator of excessive brake-lining wear, circuit means connected to said indicator means and to said housing for energizing said indicator means, and a strip-type deflectable contact member mounted on said brakeshoe beyond the periphery of said pad and electrically insulated from said backing plate and resiliently engageable with a portion of said housing lying outwardly of said periphery of said brake-lining material in a direction transverse to the direction of displacement of said brakeshoe, said strip-type deflectable contact members being connected to said circuit means for energizing said indicator means upon engagement with said housing portion and maintaining the energization of said indicator means upon withdrawal of said brakeshoe from said surface through the play of the brakeshoe, said contact member having a portion embedded in said brake-lining material and lying between said backing plate and said surface and exposed upon excessive wear thereof for engagement with said surface, said surface being in conductive relationship with said housing.
Claim 2
Dependent Claim
220 words
A vehicle-brake system comprising a rotatable brake surface, a brake-housing member disposed along said rotatable brake surface, a brakeshoe having a backing plate and a pad of brakelining material mounted on said backing plate and shiftable on said housing member toward and away from said surface for frictional contact therewith, said pad having a periphery, electrical indicator means for warning a vehicle operator of excessive brake-lining wear, circuit means connected to said indicator means and to said housing for energizing said indicator means, and a strip-type deflectable contact member mounted on said brakeshoe beyond the periphery of said pad and electrically insulated from said backing plate and resiliently engageable with a portion of said housing lying outwardly of said periphery of said brake-lining material in a direction transverse to the direction of displacement of said brakeshoe, said strip-type deflectable contact members being connected to said circuit means for energizing said indicator means upon engagement with said housing portion and maintaining the energization of said indicator means upon withdrawal of said brakeshoe from said surface through the play of the brakeshoe, said contact member having a portion embedded in said brake-lining material and lying between said backing plate and said surface and exposed upon excessive wear thereof for engagement with said surface, said surface being in conductive relationship with said housing.
Claim 3
Dependent Claim
46 words
The improvement defined in claim 1 wherein said portion of said contact member is embedded and encased in a wearable synthetic-resin sheath surrounded by said lining material, said sheath being frictionally abraded by said surface prior to engagement of said portion of said contact member therewith.
Claim 4
Dependent Claim
29 words
The improvement defined in claim 2 wherein said contact member has a resilient tongue engageable with said portion of said housing upon advance of said brakeshoe toward said surface.
Claim 5
Dependent Claim
21 words
The improvement defined in claim 2 wherein said portion of said housing has a resilient contact engageable by said contact member.
Claim 6
Dependent Claim
122 words
The improvement defined in claim 1 wherein said system includes a disk brake, said housing is a brake yoke and said surface is a brake disk passing through said yoke, said disk brake further including guide means on said yoke slidably engaging said brakeshoe for retaining same for movement towarD and away from said disk, and a cross spring on said housing engaging said guide means and bearing upon said brakeshoes, said contact member being encapsulated in an electrically insulating body and having a contact portion projecting from said body outside the brake-lining material and a further portion encased in a synthetic-resin sheath received in said brake-lining material for exposure and engagement with said disk upon excessive wear of said brake-lining material.
Claim 7
Dependent Claim
24 words
The improvement defined in claim 5 wherein said contact portion is bent to form a resilient tongue engageable with said portion of said housing.
Claim 8
Dependent Claim
16 words
The improvement defined in claim 6 wherein said portion of said housing is said cross spring.
Claim 9
Dependent Claim
15 words
The improvement defined in claim 5 wherein said portion of said housing is resiliently yieldable.
Claim 10
Dependent Claim
59 words
The improvement defined in claim 5 wherein said indicator means is a lamp mounted upon the instrument panel of said vehicle, said circuit means including a battery having one terminal grounded to the vehicle body and another terminal connected to one side of said lamp, and means for connecting the other side of said lamp to said contact member.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |