US3709334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel brake assembly fitted with automatic brake cap adjusting means
Assignee: Aisin Corp
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Filing: 1970-12-23
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Granted: 1973-01-09
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Expires: 1990-12-23
Abstract
Abstract This invention relates to an automotive wheel brake assembly fitted with automatic brake gap adjusting means. The improvement resides in the provision of a three lever- two link type force transmitting linkage mechanism connecting mechanically a parking brake actuator and an automatic brake adjuster per se which is mounted in proximity to a hydraulic brake actuator.
Inventors
- 👤 T Kondo
- 👤 A Kozakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:24
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/561; F16D65/563; F16D51/00; F16D51/16; F16D51/18; F16D51/20; F16D51/24; F16D51/46; F16D51/48; F16D51/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
212 words
An automotive wheel brake system provided with a brake gap adjuster, the latter comprising in combination: a brake drum rotatable in unison with a wheel, a backing plate fixedly mounted on an axle casing for said wheel, a pair of expandable brake shoes mounted on Said backing plate, a hydraulic shoe-actuator expandably mounted on said backing plate and operatively connected to one end of each of said shoes, a stationary anchor mounted on said backing plate, the other end of each of said shoes being normally kept in pressure contact with said stationary anchor, a pair of shoe-return springs tensioned between said shoes for exerting return movement effort thereon, linkage means containing at least a toggle means and adapted for expanding all the ends of the shoes upon parking brake application, a floating anchor mounted between said shoes and in proximity to said hydraulic actuator, a first spring means mounted between said floating anchor and either of said shoes, automatic brake gap adjuster means mounted on said floating anchor and comprising a screwed shifting means and a ratchet mechanism operatively connected therewith, and a second spring means, one end thereof being anchored on one of said shoes and the other end of said spring means being arranged to actuate said ratchet mechanism.
Claim 2
Dependent Claim
212 words
An automotive wheel brake system provided with a brake gap adjuster, the latter comprising in combination: a brake drum rotatable in unison with a wheel, a backing plate fixedly mounted on an axle casing for said wheel, a pair of expandable brake shoes mounted on Said backing plate, a hydraulic shoe-actuator expandably mounted on said backing plate and operatively connected to one end of each of said shoes, a stationary anchor mounted on said backing plate, the other end of each of said shoes being normally kept in pressure contact with said stationary anchor, a pair of shoe-return springs tensioned between said shoes for exerting return movement effort thereon, linkage means containing at least a toggle means and adapted for expanding all the ends of the shoes upon parking brake application, a floating anchor mounted between said shoes and in proximity to said hydraulic actuator, a first spring means mounted between said floating anchor and either of said shoes, automatic brake gap adjuster means mounted on said floating anchor and comprising a screwed shifting means and a ratchet mechanism operatively connected therewith, and a second spring means, one end thereof being anchored on one of said shoes and the other end of said spring means being arranged to actuate said ratchet mechanism.
Claim 3
Dependent Claim
33 words
Brake gap adjuster as claimed in claim 1, wherein said second spring is larger in its spring force than the rotational resistance appearing at the screwed shifting means provided by said return springs.
Claim 4
Dependent Claim
41 words
Brake gap adjuster as claimed in claim 1, wherein said hydraulic actuator comprises a wheel cylinder body fixedly mounted on said backing plate, a pair of hydraulically expandable pistons mounted in said cylinder body, and a spring mounted between said pistons.
Claim 5
Dependent Claim
31 words
Brake gap adjuster as claimed in claim 1, wherein said floating anchor is kept in pressure engagement with each of the both brake shoes through a kind of releasable fork joint.
Claim 6
Dependent Claim
74 words
Brake gap adjuster as claimed in claim 1, wherein said linkage means comprising a first lever mechanically connected with parking brake means and adapted for engaging with one of said shoes, a second lever pivotably connected with the other of said shoes, a third lever pivotably connected with said other of said shoes and adapted for engaging with the floating anchor, thereby expanding all the ends of the shoes upon applying the parking brake.
Claim 7
Dependent Claim
58 words
Brake gap adjuster as claimed in claim 1, wherein said ratchet mechanism comprises an adjusting lever actuated upon by said second spring means, and a ratchet wheel adapted for being actuated upon by said adjusting lever, and said screwed shifting means comprising male threads formed in said ratchet wheel and mating female threads formed on said floating anchor.
Claim 8
Dependent Claim
47 words
Brake gap adjuster as claimed in claim 6, wherein said second spring means is tensioned by anchoring its one end on one end of a L-shaped member and its other end on said adjusting lever, thereby said member and said lever being pulled resiliently towards each other.
Claim 9
Dependent Claim
55 words
Brake gap adjuster as claimed in claim 1, wherein said first spring means is tensioned between said floating anchor and one of said shoes and the tension of said second spring means is so selected that it has less effect upon the screwed shifting means when the latter is actuated upon by said shoe-returning springs.
Claim 10
Dependent Claim
40 words
Brake gap adjuster as claimed in claim 2, wherein the tension of said second spring is so selected that it overcomes the rotational resistance of said screwed shifting means when the latter is actuated upon by said first spring means.
Claim 11
Dependent Claim
40 words
Brake gap adjuster as claimed in claim 8, wherein the tension of said second spring is so selected that it overcomes the rotational resistance of said screwed shifting means when the latter is actuated upon by said first spring means.
References Cited (Backward Citations)
US3338344A
Cited
US3400787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |