US3920103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic gap adjuster for a disc brake unit
Assignee: Tokico Ltd
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Filing: 1974-02-11
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Granted: 1975-11-18
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Expires: 1994-02-11
Abstract
Abstract In a vehicle wheel disc brake unit, there is provided an atmospheric pressure chamber in the closed end of a hollow hydraulic piston adapted for actuation of one of both friction pads for the disc, and in front of a gap adjusting nut mounted threadedly on an adjusting bolt. This nut establishes normally a small predetermined length of axial idle gap formed between the nut and a correspondingly shaped portion on the inside wall surface of the piston. These normally gap-forming portions on the nut and piston constitute in combination a kind of a cone clutch.
Inventors
- 👤 Tetsuo Haraikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:29
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D2121/00; F16D2121/02; F16D2121/14; F16D2123/00; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/22; F16D2125/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
In a disc brake unit for a vehicle wheel having a brake disc secured thereto, a caliper adapted to straddle at least a portion of the periphery of said disc and having a cylinder formed in one leg thereof, a hollow piston slidably and sealingly mounted in said cylinder, said piston having a closed end for operative engagement with a friction member, a gap adjuster bolt nonrotatably and axially slidably extending through said leg and into said hollow piston along the central axis of said piston, a nut disposed in threaded engagement with the end of said bolt within said piston and in fluid tight sliding engagement with the inner surface of said hollow piston to define an air chamber within said piston, said nut and the inner surface of said hollow piston being provided with complementary axially spaced beveled coupling surfaces within said air chamber and spring means disposed in said chamber for normally biasing said surfaces axially apart, and, passage means communicating said air chamber with the external atmosphere.
Claim 2
Dependent Claim
171 words
In a disc brake unit for a vehicle wheel having a brake disc secured thereto, a caliper adapted to straddle at least a portion of the periphery of said disc and having a cylinder formed in one leg thereof, a hollow piston slidably and sealingly mounted in said cylinder, said piston having a closed end for operative engagement with a friction member, a gap adjuster bolt nonrotatably and axially slidably extending through said leg and into said hollow piston along the central axis of said piston, a nut disposed in threaded engagement with the end of said bolt within said piston and in fluid tight sliding engagement with the inner surface of said hollow piston to define an air chamber within said piston, said nut and the inner surface of said hollow piston being provided with complementary axially spaced beveled coupling surfaces within said air chamber and spring means disposed in said chamber for normally biasing said surfaces axially apart, and, passage means communicating said air chamber with the external atmosphere.
References Cited (Backward Citations)
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |