Patent US4293983A successfully refreshed from Google Patents.
Patent US3729072A successfully refreshed from Google Patents.
US3729072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake adjuster
Assignee: Bendix Corp
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Filing: 1972-03-24
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Granted: 1973-04-24
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Expires: 1992-03-24
Abstract
Abstract An automatically operative brake adjuster and retract device particularly adapted for a multiple disc brake of the disc type. A fixed outer bushing threadedly engaged with a carrier member slidably contains an inner bushing loaded by a return compression spring interposed between the inner and outer bushings. A radially deformable cylinder fixed to the inner bushing slidably contains a fluid pressure actuated tapered piston having an interference or force fit therein and adapted to deform the cylinder radially outwardly under the influence of applied pressurized fluid on the piston to permit axial movement of the piston therein to the degree necessary for brake application. Brake release in response to depressurization of the piston permits the inner bushing to retract relative to the outer bushing under the influence of the compression spring thereby establishing a predetermined retract position of the cylinder and thus the piston frictionally engaged therewith.
Inventors
- 👤 D Borkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:46
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/54; F16D65/543
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
224 words
Brake adjusting apparatus for a brake assembly having a predetermined running clearance and energized by pressurized fluid, said brake adjusting apparatus comprising: a chamber having a fluid connection with a controlled source of pressurized fluid; a bushing removably secured in said chamber; a sleeve member slidably carried by said bushing for axial movement therein; a first fixed stop engageable with said sleeve member for limiting movement thereof in a brake-applying direction; a second fixed stop engageable with said sleeve member for limiting movement thereof in a brake release direction; resilient means urging said sleeve member into engagement with said second stop; a radially deformable cylinder carried by said sleeve member and movable therewith; and piston means slidably carried by said cylinder and having an interference fit therewith; said piston means being responsive to said pressurized fluid and together with said sleeve member movable in a brake-applying direction; said sleeve member being engageable with said first stop whereupon said piston means is forcibly urged through said cylinder causing radial outward deformation thereof to reposition said piston means axially therein to the extent provided by unwanted brake clearance between frictionally engageable members of the brake; said pressurized fluid being released to permit retraction of said sleeve member into engagement with said second stop in response to said resilient means to establish a predetermined brake running clearance.
Claim 2
Dependent Claim
224 words
Brake adjusting apparatus for a brake assembly having a predetermined running clearance and energized by pressurized fluid, said brake adjusting apparatus comprising: a chamber having a fluid connection with a controlled source of pressurized fluid; a bushing removably secured in said chamber; a sleeve member slidably carried by said bushing for axial movement therein; a first fixed stop engageable with said sleeve member for limiting movement thereof in a brake-applying direction; a second fixed stop engageable with said sleeve member for limiting movement thereof in a brake release direction; resilient means urging said sleeve member into engagement with said second stop; a radially deformable cylinder carried by said sleeve member and movable therewith; and piston means slidably carried by said cylinder and having an interference fit therewith; said piston means being responsive to said pressurized fluid and together with said sleeve member movable in a brake-applying direction; said sleeve member being engageable with said first stop whereupon said piston means is forcibly urged through said cylinder causing radial outward deformation thereof to reposition said piston means axially therein to the extent provided by unwanted brake clearance between frictionally engageable members of the brake; said pressurized fluid being released to permit retraction of said sleeve member into engagement with said second stop in response to said resilient means to establish a predetermined brake running clearance.
Claim 3
Dependent Claim
31 words
Brake adjusting apparatus for a brake assembly as claimed in claim 1, wherein: said chamber is defined by a carrier member; and said bushing is threadedly engaged with said carrier member.
Claim 4
Dependent Claim
42 words
Brake adjusting apparatus for a brake-assembly as claimed in claim 2, wherein: said first stop is defined by an axially extending annular portion of said bushing; and said sleeve is provided with a radially outwardly extending flange engageable with said first stop.
Claim 5
Dependent Claim
27 words
Brake adjusting apparatus for a brake assembly as claimed in claim 3 wherein: said resilient means is a compression spring interposed between said bushing and said flange.
Claim 6
Dependent Claim
36 words
Brake adjusting apparatus for a brake assembly as claimed in claim 1, wherein: said piston means is provided with a radially inwardly tapering portion engageable with said cylinder and operative to deform said cylinder radially outwardly.
Claim 7
Dependent Claim
65 words
Brake adjusting apparatus for a brake assembly as claimed in claim 1, wherein: said sleeve member is provided with a radially inwardly extending end portion defining an opening; said piston means is provided with a reduced diameter portion including a section of heat insulation material fixedly secured thereto and extending through said opening into engagement with the heat generating frictionally engageable portion of the brake.
Claim 8
Dependent Claim
35 words
Brake adjusting apparatus for a brake assembly as claimed in claim 6, wherein: said cylinder is concentric with said sleeve and engageable at one end with said radially inwardly extending end portion of said sleeve.
Claim 9
Dependent Claim
34 words
Brake adjusting apparatus for a brake assembly as claimed in claim 1, wherein: said piston means is frictionally secured in said cylinder in the absence of said pressurized fluid tending to apply the brake.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |