Patent JP2002131067A successfully refreshed from Google Patents.
US4183012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion alarm device for disk brake
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1978-08-02
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Granted: 1980-01-08
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Expires: 1998-08-02
Abstract
Abstract An electrical contact is embedded in an insulator which, in turn, is fitted onto the disk side of the backing plate on a disk pad. When the pad wears excessively the insulator is worn away and the contact abuts the disk so that an alarm signal may be generated. Further wear will cause the disk to abrade and break the contact. The contact assembly is compact and enters the brake assembly through a vent hole which is typically provided therein.
Inventors
- 👤 Ryoichi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
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
170 words
An abrasion alarm device for a disk brake of the type having a window hole in a floating caliper, said alarm being of the type which is mounted on a floating caliper which is moved in the axial direction of a brake disk to cause a frictional pad on one side of the disk to abut against a disk braking surface, and which gives an alarm upon excessive abrasion of the frictional pad, wherein the improvement is characterized in that said abrasion alarm device comprises: a probe having an electric wire for generating an electrical signal through frictional engagement with the disk braking surface; and a spring member having a depressing part adapted to elastically abut said probe in such a manner that said probe is moved away from said disk, said spring member being elastically locked with an edge of said window hole formed outside said disk and in said floating caliper by an elastically locking part of said spring member which acts in opposition to said depressing part.
Claim 2
Dependent Claim
170 words
An abrasion alarm device for a disk brake of the type having a window hole in a floating caliper, said alarm being of the type which is mounted on a floating caliper which is moved in the axial direction of a brake disk to cause a frictional pad on one side of the disk to abut against a disk braking surface, and which gives an alarm upon excessive abrasion of the frictional pad, wherein the improvement is characterized in that said abrasion alarm device comprises: a probe having an electric wire for generating an electrical signal through frictional engagement with the disk braking surface; and a spring member having a depressing part adapted to elastically abut said probe in such a manner that said probe is moved away from said disk, said spring member being elastically locked with an edge of said window hole formed outside said disk and in said floating caliper by an elastically locking part of said spring member which acts in opposition to said depressing part.
Claim 3
Dependent Claim
32 words
An abrasion alarm system as claimed in claim 1, characterized in that said pad is provided with a rear plate having a hole therein and said probe is inserted into the hole.
Claim 4
Dependent Claim
53 words
An abrasion alarm device as claimed in claim 2, characterized in that said probe is provided with a flange whose diameter is larger than that of the hole of said rear plate into which said probe is inserted, said flange being provided on the disk side of the hole in said rear plate.
Claim 5
Dependent Claim
27 words
An abrasion alarm device as claimed in any of claims 1 through 3, characterized in that said spring member is made of one sheet of metal plate.
Claim 6
Dependent Claim
36 words
An abrasion alarm device as claimed in any of claims 1 through 3, characterized in that said spring member has at its end portion a holding part adapted to hold electrical wires extending from said probe.
References Cited (Backward Citations)
US3893543A
Cited
US3986164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |