US4598800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic adjusting device for a disc brake
Assignee: ITT Inc
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Filing: 1984-10-01
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Granted: 1986-07-08
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Expires: 2004-10-01
Abstract
Abstract An automatic adjusting device for a hydraulically and mechanically actuatable disc brake is disclosed including an adjusting member interposed between a brake piston and a mechanical actuating device. The adjusting member includes an adjusting nut connected to the brake piston by a non-self locking threaded element and includes a conical friction surface cooperating with a friction surface on a hand brake piston. A stop on an axially adjustable sleeve supports the adjusting nut and provides for adjustment of the spacing between the friction surfaces in the inactuated position.
Inventors
- 👤 Vlad Marianu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:35
CPC Classifications
F; F16; F16D; F16D65/00; 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: 15
Claim 1
Independent Claim
265 words
An automatic adjusting device for a disc brake of the type including a brake piston slidably mounted in a brake cylinder in a housing adapted to actuate a brake shoe in which said brake piston is actuatable by a hydraulic and a mechanical actuating device comprising: an adjusting nut having a coaxial threaded bore, said adjusting nut mounted to said brake piston for coaxial extension relative to said brake piston by a threaded member fixedly secured at one end to said brake piston and including a thread received in said threaded bore, said thread being of a steep, non-self locking type, said adjusting nut further including a first friction surface at one end; a hand brake piston slidably mounted in said housing coaxial with said adjusting nut, said hand brake piston operatively connected to said mechanical actuating device and including a second friction surface adjacent to and spaced from said first friction surface in an unactuated mode of said mechanical actuating device, said first and second friction surfaces defining a friction clutch for engaging and frictionally restraining said adjusting nut against torsional movement when said mechanical actuating device is actuated; a sleeve fixedly mounted to said housing and disposed around said adjusting nut between said adjusting nut and said brake piston; one antifriction bearing mounted between said sleeve and said adjusting nut; a spring within said sleeve supported on one side by a first stop on said sleeve biasing said bearing onto said adjusting nut against a second stop on said sleeve; and means for adjusting the spacing between said first and second friction surfaces.
Claim 2
Dependent Claim
265 words
An automatic adjusting device for a disc brake of the type including a brake piston slidably mounted in a brake cylinder in a housing adapted to actuate a brake shoe in which said brake piston is actuatable by a hydraulic and a mechanical actuating device comprising: an adjusting nut having a coaxial threaded bore, said adjusting nut mounted to said brake piston for coaxial extension relative to said brake piston by a threaded member fixedly secured at one end to said brake piston and including a thread received in said threaded bore, said thread being of a steep, non-self locking type, said adjusting nut further including a first friction surface at one end; a hand brake piston slidably mounted in said housing coaxial with said adjusting nut, said hand brake piston operatively connected to said mechanical actuating device and including a second friction surface adjacent to and spaced from said first friction surface in an unactuated mode of said mechanical actuating device, said first and second friction surfaces defining a friction clutch for engaging and frictionally restraining said adjusting nut against torsional movement when said mechanical actuating device is actuated; a sleeve fixedly mounted to said housing and disposed around said adjusting nut between said adjusting nut and said brake piston; one antifriction bearing mounted between said sleeve and said adjusting nut; a spring within said sleeve supported on one side by a first stop on said sleeve biasing said bearing onto said adjusting nut against a second stop on said sleeve; and means for adjusting the spacing between said first and second friction surfaces.
Claim 3
Dependent Claim
25 words
An automatic adjusting device as claimed in claim 1 wherein an inner bearing ring of the antifriction bearing member is defined by the adjusting nut.
Claim 4
Dependent Claim
21 words
An automatic adjusting device as claimed in claim 1 wherein an outer bearing ring of said antifriction bearing member is divided.
Claim 5
Dependent Claim
17 words
An automatic adjusting device as claimed in claim 1, in which the spring comprises a cup spring.
Claim 6
Dependent Claim
35 words
An automatic adjusting device as claimed in claim 4, in which the adjusting nut includes at an end adjacent to the brake piston an axially extending cylindrical projection around which the cup spring is arranged.
Claim 7
Dependent Claim
28 words
An automatic adjusting device as claimed in claim 1 wherein the first stop is a radially inwardly projecting ring inserted into the sleeve against which the spring bears.
Claim 8
Dependent Claim
43 words
An automatic adjusting device as claimed in claim 1 wherein a fastening end of the sleeve comprises a radially extending flange which is inserted into a groove in the housing and which is coupled to the housing by means of a pinch engagement.
Claim 9
Dependent Claim
20 words
An automatic adjusting device as claimed in claim 1 wherein the first and second friction surfaces define a conical shape.
Claim 10
Dependent Claim
26 words
An automatic adjusting device as claimed in claim 8, wherein at least one of said first and said second friction surfaces includes at least one through-recess.
Claim 11
Dependent Claim
25 words
An automatic adjusting device as claimed in claim 1 wherein the hand brake piston includes a radially outwardly extending flange including the second friction surface.
Claim 12
Dependent Claim
23 words
An automatic adjusting device as claimed in claim 1, in which the hand brake piston is secured against torsion by a torsion-preventing mechanism.
Claim 13
Dependent Claim
35 words
An automatic adjusting device as claimed in claim 11, in which the torsion-preventing mechanism includes at least one projection on the hand brake piston, said projection engages in at least one recess in the housing.
Claim 14
Dependent Claim
34 words
An automatic adjusting device as claimed in claim 1, wherein said means for adjusting the spacing between said first and second friction surfaces comprises means for axially adjusting the position of said first stop.
Claim 15
Dependent Claim
72 words
An automatic adjusting device as claimed in claim 1, wherein said means for adjusting the spacing between said first and second friction surfaces includes said sleeve including a first sleeve part affixed to said housing and a second sleeve part threadedly coaxially attached to said first sleeve part, said first and second stop associated with said second sleeve part, whereby said adjusting nut is axially positionable relative to said hand brake piston.
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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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |