US3893543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient structure for disc brake friction pad
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1973-10-23
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Granted: 1975-07-08
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Expires: 1993-10-23
Abstract
Abstract Herein disclosed is a resilient structure for use in a disc brake of the type including an electric wire having its looped end extending in the brake lining from the rear side thereof with a predetermined distance, and detecting means feeding an electric current to the electric wire for detecting disconnection at the looped end to indicate that the brake lining is worn out to exceed the working limit of the disc brake. The resilient structure includes a guide member pressor extending circumferentially of the brake disc and resiliently engaged with the guide member of the disc brake for applying a thrust to the latter, and a resilient arm extending from the guide member pressor and engaged with the electric wire for applying a tension to the same to ensure said disconnection. The resilient structure may be made of a simple spring wire, and biases the friction pad so as to prevent undesirable noises which might otherwise be produced at the frictional engagement between the friction pad and the brake disc.
Inventors
- 👤 Juichi Sibatani
- 👤 Sadayoshi Itou
- 👤 Masachika Yamamoto
- 👤 Mithuhiko Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:17
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
218 words
In a disc brake assembly wherein: a friction pad is mounted for limited movement toward and away from a rotating brake disc in a direction parallel to the axis of disc rotation and between laterally spaced guide surfaces of a fixed guide member, and wherein an insulated wire is loop coupled to the movable brake friction pad and a resilient member is mounted on the back plate of the movable friction pad and engages the insulated wire to move at least one portion of the loop away from the back plate upon severance of the wire by brake pad wear, the improvement wherein: said resilient member comprises: a resilient guide member pressor which protrudes laterally from one side of the back plate and laterally engages one of said laterally spaced guide surfaces for biasing the other side of said back plate into contact with the other guide sUrface to eliminate squeal when applying the brake, and said resilient member further comprises a unitary resilient arm, said arm engaging said insulated wire loop and exerting a tensioning force thereon to bias said wire loop radially outwards relative to the axis of rotation of said brake disc such that the resilient arm carries the loop portion of said insulated wire radially outwards of said brake disc when loop severance occurs.
Claim 2
Dependent Claim
218 words
In a disc brake assembly wherein: a friction pad is mounted for limited movement toward and away from a rotating brake disc in a direction parallel to the axis of disc rotation and between laterally spaced guide surfaces of a fixed guide member, and wherein an insulated wire is loop coupled to the movable brake friction pad and a resilient member is mounted on the back plate of the movable friction pad and engages the insulated wire to move at least one portion of the loop away from the back plate upon severance of the wire by brake pad wear, the improvement wherein: said resilient member comprises: a resilient guide member pressor which protrudes laterally from one side of the back plate and laterally engages one of said laterally spaced guide surfaces for biasing the other side of said back plate into contact with the other guide sUrface to eliminate squeal when applying the brake, and said resilient member further comprises a unitary resilient arm, said arm engaging said insulated wire loop and exerting a tensioning force thereon to bias said wire loop radially outwards relative to the axis of rotation of said brake disc such that the resilient arm carries the loop portion of said insulated wire radially outwards of said brake disc when loop severance occurs.
Claim 3
Dependent Claim
23 words
A resilient structure according to claim 1, wherein said guide member pressor and said resilient arm are made of a continuous spring wire.
Claim 4
Dependent Claim
24 words
A resilient structure according to claim 2, wherein said resilient arm has a looped end surrounding said wire for retaining said electric wire thereat.
Claim 5
Dependent Claim
261 words
In a disc brake including: a brake disc rotatable about its axis, a guide member fixedly positioned to one side of said brake disc, a laterally movable friction pad mounted to said guide member and movable toward and away from said friction disc and guided at respective ends by guide surfaces formed by said guide member, said friction pad including a brake lining and a back plate, actuating means for moving said friction pad to bring the brake lining of the same into engagement with said brake disc, and an electric wire extending into said brake lining from the rear side thereof by way of a looped end for detecting disconnection at the looped end to indicate wear of the brake lining to the extent of a predetermined thickness, the improvement comprising: a resilient structure mounted on the back plate of the movable friction pad and comprising a resilient guide member pressor which extends circumferentially beyond said brake disc and protrudes laterally from one side of the back plate, in engagement with one of said laterally spaced guide surfaces for biasing the other side of the back plate into surface contact with the other guide surface to eliminate squeal when applying the brake, and a unitary resilient arm which engages said insulated wire looped end and exerts a tensioning force biasing said looped end radially outwards relative to the axis of rotation of said brake disc so as to force the looped end radially outwards upon severance of the looped end by wear of said brake lining to said predetermined thickness.
Claim 6
Dependent Claim
261 words
In a disc brake including: a brake disc rotatable about its axis, a guide member fixedly positioned to one side of said brake disc, a laterally movable friction pad mounted to said guide member and movable toward and away from said friction disc and guided at respective ends by guide surfaces formed by said guide member, said friction pad including a brake lining and a back plate, actuating means for moving said friction pad to bring the brake lining of the same into engagement with said brake disc, and an electric wire extending into said brake lining from the rear side thereof by way of a looped end for detecting disconnection at the looped end to indicate wear of the brake lining to the extent of a predetermined thickness, the improvement comprising: a resilient structure mounted on the back plate of the movable friction pad and comprising a resilient guide member pressor which extends circumferentially beyond said brake disc and protrudes laterally from one side of the back plate, in engagement with one of said laterally spaced guide surfaces for biasing the other side of the back plate into surface contact with the other guide surface to eliminate squeal when applying the brake, and a unitary resilient arm which engages said insulated wire looped end and exerts a tensioning force biasing said looped end radially outwards relative to the axis of rotation of said brake disc so as to force the looped end radially outwards upon severance of the looped end by wear of said brake lining to said predetermined thickness.
Claim 7
Dependent Claim
42 words
The disc brake according to claim 4, wherein said resilient structure comprises a continuous spring wire, said wire is reversely looped intermediate its ends and said reverse loop engages said one surface of said guide member and forms said guide member pressor.
Claim 8
Dependent Claim
80 words
The disc brake as claimed in claim 5, wherein said back plate includes at least one hole therein and said continuous spring wire includes a portion extending from said reverse loop and crossing over the upper edge of said back plate, and which further extends along a portion of the back of said plate and terminating within said hole from the back side to the front side to impart resiliency to both said guide member pressor and to said arm.
Claim 9
Dependent Claim
95 words
The disc brake according to claim 6, wherein: a pair of support pins extend axially outwardly of said guide member parallel to said guide surfaces and spaced inwardly therefrom, said back plate includes openings therein at positions corresponding to the pins and said plate is slidably mounted on said pins, said spring wire reverse loop is carried on one of said pins, and said hole within said back plate lies intermediate of the openings receiving said pins and said wire loop extends through said hole along with the terminal end of said wire spring portion.
References Cited (Backward Citations)
US3716113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |