Patent US1964562A successfully refreshed from Google Patents.
Patent US3943486A successfully refreshed from Google Patents.
US3943486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lining wear warning device
Assignee: Tokico Ltd
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Filing: 1974-09-16
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Granted: 1976-03-09
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Expires: 1994-09-16
Abstract
Abstract A lining wear warning device for a brake shoe lining rotatable member pivotally supported on a non-rotatable member so as to be engaged with a brake shoe carrying a brake lining is pivotally moved when the brake shoe is actuated; means arranged on the non-rotatable member in engagement with the rotatable member permits the movement of rotatable member during the braking operation and prevents the movement in the reverse direction when the brake is released; and an electric switch operative in response to a predetermined amount of relative movement between the rotatable and non-rotatable members closes a warning circuit, the relative movement between the rotatable and non-rotatable members being proportional to an amount of lining wear.
Inventors
- 👤 Yoshihiro Hayashida
- 👤 Haruyuki Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:01
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
260 words
A lining wear warning device for use in a vehicle brake having a non-rotatable member and at least one brake shoe having a lining thereon and movable during a braking operation, said device comprising: a rotatable ratchet member pivotally supported on the non-rotatable member and engaged with the brake shoe for pivotally moving when the brake shoe is actuated; control means on the non-rotatable member engaged with the ratchet member for permitting the pivotal movement in one direction during the braking operation and for limiting the pivotal movement of the ratchet member in the reverse direction when the braking operation is completed, said control means comprised of a claw positioned on said non-rotatable member engageable with the teeth of said ratchet member; a warning circuit engageable with said ratchet member for detecting a predetermined amount of movement between the ratchet member and the non-rotatable member corresponding to the amount of lining wear and for warning when the lining wear reaches a predetermined level, said warning circuit comprised of: an electric source; a warning indicator connected to the electric source for warning when the lining wear reaches a predetermined level; and an electric limiting switch connected to said warning indicator, engageable by said ratchet, and operative in response to a predetermined amount of movement between the ratchet member and the non-rotatable member, said relative movement being proportioned to an amount of lining wear, whereby when the lining wear reaches a predetermined amount, the limiting switch will close in response to the movement of the ratchet member and activate the warning indicator.
Claim 2
Dependent Claim
260 words
A lining wear warning device for use in a vehicle brake having a non-rotatable member and at least one brake shoe having a lining thereon and movable during a braking operation, said device comprising: a rotatable ratchet member pivotally supported on the non-rotatable member and engaged with the brake shoe for pivotally moving when the brake shoe is actuated; control means on the non-rotatable member engaged with the ratchet member for permitting the pivotal movement in one direction during the braking operation and for limiting the pivotal movement of the ratchet member in the reverse direction when the braking operation is completed, said control means comprised of a claw positioned on said non-rotatable member engageable with the teeth of said ratchet member; a warning circuit engageable with said ratchet member for detecting a predetermined amount of movement between the ratchet member and the non-rotatable member corresponding to the amount of lining wear and for warning when the lining wear reaches a predetermined level, said warning circuit comprised of: an electric source; a warning indicator connected to the electric source for warning when the lining wear reaches a predetermined level; and an electric limiting switch connected to said warning indicator, engageable by said ratchet, and operative in response to a predetermined amount of movement between the ratchet member and the non-rotatable member, said relative movement being proportioned to an amount of lining wear, whereby when the lining wear reaches a predetermined amount, the limiting switch will close in response to the movement of the ratchet member and activate the warning indicator.
Claim 3
Dependent Claim
54 words
A lining wear warning device as claimed in claim 1, wherein: said vehicle brake is an internal shoe drum brake having two arcuate brake shoes; and said non-rotatable member is a strut extending between the said two brake shoes, whereby said ratchet, claw, and strut function as a brake shoe clearance automatic adjusting mechanism.
References Cited (Backward Citations)
US3722629A
Cited
US3776329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |