Patent US3783981A successfully refreshed from Google Patents.
US3783981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-adjusting device for brakes
Assignee: TDK Micronas GmbH
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Filing: 1972-07-26
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Granted: 1974-01-08
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Expires: 1992-07-26
Abstract
Abstract This relates to an automatic lining-wear adjusting device for a hydraulically and mechanically actuated spot-type disc brake. The adjusting device includes an adjusting spindle and an adjusting nut threaded together by a steep thread. The adjusting spindle is connected to the actuating piston and follows the axial piston movement without rotary motion. The adjusting nut rotates on the spindle for lining-wear adjustment. This rotation of the adjusting nut is accomplished by a spring biasing the adjusting nut against a low friction bearing at the cylinder bottom. To maintain handbrake clearance and to actuate the piston by the handbrake, a handbrake actuated mechanism engages the spindle-nut arrangement to prevent relative rotary motion of the two elements of this arrangement and at the same time causes axial motion of the arrangement to actuate the piston for brake application.
Inventors
- 👤 J Burgdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:53
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: 11
Claim 1
Independent Claim
222 words
A self-adjusting device for a brake comprising: a hydraulic cylinder having a longitudinal axis and a first bore disposed coaxial of said axis, said first bore being open at one end and having a transverse cylinder bottom at the other end; a hollow brake piston coaxial of said axis and slidably sealed to the inner surface of said first bore, said piston having a transverse brake actuating member adjacent said one end of said first bore; an adjusting spindle coaxial of said axis within said piston, said spindle having one end thereof directly connected to said brake actuating member, said spindle being capable of axial motion only; an adjusting nut coaxial of said axis threaded to the outer surface of said spindle and in a low friction relation with said cylinder bottom; a spring biasing said nut toward said cylinder bottom to enable rotary motion of said nut relative to said spindle to enable a desired adjustment to compensate for brake lining wear; said nut and said spindle having a steep thread; and a handbrake actuated mechanism coaxial of an extension of said axis to engage one of said nut and said spindle upon actuation thereof to prevent relative rotary motion between said nut and said spindle and to provide axial motion of said spindle to actuate said piston for brake application.
Claim 2
Dependent Claim
222 words
A self-adjusting device for a brake comprising: a hydraulic cylinder having a longitudinal axis and a first bore disposed coaxial of said axis, said first bore being open at one end and having a transverse cylinder bottom at the other end; a hollow brake piston coaxial of said axis and slidably sealed to the inner surface of said first bore, said piston having a transverse brake actuating member adjacent said one end of said first bore; an adjusting spindle coaxial of said axis within said piston, said spindle having one end thereof directly connected to said brake actuating member, said spindle being capable of axial motion only; an adjusting nut coaxial of said axis threaded to the outer surface of said spindle and in a low friction relation with said cylinder bottom; a spring biasing said nut toward said cylinder bottom to enable rotary motion of said nut relative to said spindle to enable a desired adjustment to compensate for brake lining wear; said nut and said spindle having a steep thread; and a handbrake actuated mechanism coaxial of an extension of said axis to engage one of said nut and said spindle upon actuation thereof to prevent relative rotary motion between said nut and said spindle and to provide axial motion of said spindle to actuate said piston for brake application.
Claim 3
Dependent Claim
13 words
A device according to claim 1, wherein said mechanism directly engages said nut.
Claim 4
Dependent Claim
41 words
A device according to claim 1, further including a roll-back seal disposed between the inner surface of said first bore and the outer surface of said piston adjacent said one end of said first bore cooperating to provide a return force.
Claim 5
Dependent Claim
31 words
A device according to claim 1, further including a ball bearing between said cylinder bottom and said nut to provide a low friction contact between said nut and said cylinder bottom.
Claim 6
Dependent Claim
84 words
A device according to claim 1, further including a housing disposed within said piston and external of said nut coaxial of said axis, one end of said housing being secured to tHe inner surface of said first bore adjacent said other end thereof and the other end of said housing having a transverse surface extending toward said axis, and wherein said nut includes a step extending toward said axis, and said spring is disposed between said step and said other end of said housing.
Claim 7
Dependent Claim
18 words
A device according to claim 5, further including a ball bearing disposed between said spring and said step.
Claim 8
Dependent Claim
29 words
A device according to claim 1, wherein a strong rotation limiting connection exists between one of said nut and said spindle and said mechanism upon actuation of said mechanism.
Claim 9
Dependent Claim
78 words
A device according to claim 7, wherein said cylinder further includes a second bore disposed coaxial of an extension of said axis and extending through said cylinder bottom; and said mechanism includes a handbrake actuated piston coaxial of said extension of said axis and slidably sealed to the inner surface of said second bore; said handbrake actuated piston and said nut having mating conical surfaces to provide said strong rotation limiting connection upon actuation of said handbrake piston.
Claim 10
Dependent Claim
24 words
A device according to claim 8, wherein a handbrake clearance is provided between said mating conical surfaces when said handbrake piston is not actuated.
Claim 11
Dependent Claim
48 words
A device according to claim 8, wherein said mechanism further includes a flat push rod coaxial of said extension of said axis to actuate said handbrake piston, the flat shape of said push rod acting to cooperating in preventing rotary motion of said handbrake piston and said nut.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |