Patent US1510657A successfully refreshed from Google Patents.
Patent US3958666A successfully refreshed from Google Patents.
US3958666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Worn lining warning device
Assignee: Bendix Corp
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Filing: 1974-11-11
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Granted: 1976-05-25
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Expires: 1994-11-11
Abstract
Abstract A worn lining warning indicator used on a disc brake is disclosed. The indicator includes a projection which extends from the edge of the friction element and which wears away as the friction lining wears. A spring arm is carried by the friction element and includes a portion which extends over the periphery of the projection and also over the periphery of the rotor. Initially, when the brake linings are new, the projection on the friction element supports the resilient member away from the periphery of the disc. However, when the linings have worn an amount sufficient to wear the projection away, the resiliency of the member biases the end of the latter into engagement with the periphery of the rotor. The engagement of the resilient member with discontinuities on the rotor periphery produces a unique, pulsating, "picket fence" noise as the rotor rotates to thereby warn the vehicle operator that the brake linings need replacement.
Inventors
- 👤 Robert L. Hooten
- 👤 Norman C. Van De Somple
- 👤 George L. Koloszar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:44
CPC Classifications
F; F16; F16D; F16D66/00; F16D66/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
155 words
In a disc brake including a caliper housing a rotor rotatable about an axis having a pair of opposed friction faces, the periphery of said rotor between said faces having solid portions and open portions between said solid portions a pair of friction elements including friction material for engagement with said friction faces, and means for urging said friction elements into braking engagement with said friction faces when a brake application is effected, wherein the invention comprises resilient means carried by the caliper housing responsive to wear of the friction material of one of said friction elements, said wear responsive means including means normally held away from said periphery of the rotor but moving to engage said periphery of the rotor when the friction elements have worn to a predetermined thickness, whereby engagement of the wear responsive means with the solid portions and the open portions generates a pulsating noise upon rotation of said rotor.
Claim 2
Dependent Claim
155 words
In a disc brake including a caliper housing a rotor rotatable about an axis having a pair of opposed friction faces, the periphery of said rotor between said faces having solid portions and open portions between said solid portions a pair of friction elements including friction material for engagement with said friction faces, and means for urging said friction elements into braking engagement with said friction faces when a brake application is effected, wherein the invention comprises resilient means carried by the caliper housing responsive to wear of the friction material of one of said friction elements, said wear responsive means including means normally held away from said periphery of the rotor but moving to engage said periphery of the rotor when the friction elements have worn to a predetermined thickness, whereby engagement of the wear responsive means with the solid portions and the open portions generates a pulsating noise upon rotation of said rotor.
Claim 3
Dependent Claim
32 words
The invention of claim 1: said means responsive to wear of said one friction element being a resilient member carried by said caliper housing and extending over the periphery of said rotor.
Claim 4
Dependent Claim
88 words
The invention of claim 2: the friction material of the friction element engageable with said one friction face including a radial projection extending from the edge of said friction material adjacent the periphery of the rotor, said projection initially holding the resilient member away from the rotor, said projection wearing away as the friction material on said one friction element wears to permit said resilient member to engage said periphery of the rotor when the friction material on said one friction element has worn to a predetermined thickness.
Claim 5
Dependent Claim
44 words
The invention of claim 3: said resilient member including a relatively flat portion extending over the periphery of said one friction face, said relatively flat portion terminating in a depression, the tip of said depression being adapted to engage said periphery of the rotor.
Claim 6
Dependent Claim
20 words
The invention of claim 3: said resilient member being carried by said friction element engageable with said one friction face.
Claim 7
Dependent Claim
53 words
The invention of claim 5: said resilient member including a first portion extending generally parallel to said one friction face and secured to said one friction element, and a second portion projecting from said first portion and extending across the edge of said one friction element and over the periphery of said rotor.
Claim 8
Dependent Claim
42 words
The invention of claim 6: said second portion comprising a relatively flat section extending across the periphery of said one friction face, said flat portion terminating in a depression, the tip of said depression adapted to engage said periphery of the rotor.
Claim 9
Dependent Claim
41 words
The invention of claim 7: said friction element engaging said one friction face including said friction material, a backing plate, and rivets securing said friction material to said backing plate, said rivets also securing said resilient member to said backing plate.
Claim 10
Dependent Claim
88 words
The invention of claim 7: said friction element engaging said one friction face including a backing plate mounting said friction material, said backing plate having an aperture, said first portion extending along the side of said backing plate opposite the side of the latter to which the friction material is attached, said first portion including a clip extending across one end of the friction element and terminating in a hook extending through said aperture to attach the resilient member to said friction element engaging the one friction face.
Claim 11
Dependent Claim
26 words
The invention of claim 1: said solid portions being defined by radially extending vanes disposed between said friction faces, said vanes defining said open portions therebetween.
Claim 12
Dependent Claim
96 words
The invention of claim 1: the friction material of the other friction element including a radial projection extending from the edge of said friction material adjacent the periphery of the rotor; and another resilient member carried by said one friction element and extending across the periphery of the rotor to engage the projection on the other friction element, said projection on said other friction element wearing away as the friction material on said one friction element wears to permit said discontinuities when the friction material on the other friction element has worn to a predetermined thickness.
Claim 13
Dependent Claim
168 words
In a disc brake including a caliper housing a rotor rotatable about an axis and having a pair of opposed friction faces, a pair of friction elements including friction material for engagement with said friction faces, and means for urging said friction elements into braking engagement with said friction faces, wherein the invention comprises a projection extending from the edge of the friction material comprising one of said friction elements adjacent the periphery of the rotor, and resilient means carried by the caliper housing extending over the periphery of said projection and also extending over the periphery of the rotor, said projection holding said means extending over the periphery of said projection and over the periphery of said rotor away from the periphery of the rotor, said projection wearing away as said friction material wears away, whereby the means extending over the periphery of said projection and over the periphery of said rotor is permitted to engage said rotor to generate noise when said projection is worn away.
Claim 14
Dependent Claim
168 words
In a disc brake including a caliper housing a rotor rotatable about an axis and having a pair of opposed friction faces, a pair of friction elements including friction material for engagement with said friction faces, and means for urging said friction elements into braking engagement with said friction faces, wherein the invention comprises a projection extending from the edge of the friction material comprising one of said friction elements adjacent the periphery of the rotor, and resilient means carried by the caliper housing extending over the periphery of said projection and also extending over the periphery of the rotor, said projection holding said means extending over the periphery of said projection and over the periphery of said rotor away from the periphery of the rotor, said projection wearing away as said friction material wears away, whereby the means extending over the periphery of said projection and over the periphery of said rotor is permitted to engage said rotor to generate noise when said projection is worn away.
Claim 15
Dependent Claim
68 words
The invention of claim 12: said means extending over the periphery of said projection and the periphery of said rotor being a resilient member carried by said caliper housing; said resilient member including a relatively flat portion extending over the periphery of said one friction face, said relatively flat portion terminating in a depression, the tip of said depression being adapted to engage said periphery of the rotor.
Claim 16
Dependent Claim
44 words
The invention of claim 12: said means extending over the periphery of said projection and the periphery of said rotor being a resilient member carried by said caliper housing; said resilient member being carried by said friction element engageable with said one friction face.
Claim 17
Dependent Claim
53 words
The invention of claim 14: said resilient member including a first portion extending generally parallel to said one friction face and secured to said one friction element, and a second portion projecting from said first portion and extending across the edge of said one friction element and over the periphery of said rotor.
Claim 18
Dependent Claim
42 words
The invention of claim 15: said second portion comprising a relatively flat section extending across the periphery of said one friction face, said flat portion terminating in a depression, the tip of said depression adapted to engage said periphery of the rotor.
Claim 19
Dependent Claim
41 words
The invention of claim 16: said friction element engaging said one friction face including said friction material, a backing plate, and rivets securing said friction material to said backing plate, said rivets also securing said resilient member to said backing plate.
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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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |