Patent US3613836A successfully refreshed from Google Patents.
US3613836A
Expired / Lapsed
US
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Friction element assembly support and actuating means for disc brakes
Assignee: Individual
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Filing: 1969-10-15
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Granted: 1971-10-19
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Expires: 1989-10-15
Abstract
Abstract A disc brake in which the friction element assemblies, which are arranged to engage a minor proportion of the disc area, are guided into engagement with the disc on three pairs of guide members, each pair of guide members comprising a key and a corresponding keyway, the members of each pair being arranged to allow sliding movement in an axial brake applying direction and also a limited amount of radial movement relative to the axis of rotation of the disc, so allowing each friction element assembly to align itself in its own plane to compensate for inaccuracies in manufacture, the location of the keys and deformations and expansions occuring during braking, of which the following is a specification.
Inventors
- 👤 Frederick Sidney Dowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:18
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
237 words
In a disc brake having a rotatable disc: a nonrotatable support, a pair of axially aligned relatively axially movable friction element assemblies of arcuate form disposed one on each side of said disc and having friction pads arranged to engage a minor portion of the disc area, and a brake-applying mechanism arranged to apply a brake-applying force against said friction element assemblies along a line of action which is nonintersecting with said friction pads guide means associated with said support and with at least one of said friction assemblies and arranged to provide guided movement of said friction element assembly in a brake-applying direction and to provide resistance to the braking dragloads thereon, said guide means comprising three pairs of interengaging guide members having uncommon instantaneous centers of rotation, members of each pair being associated respectively with said support and a respective one of said friction elements, one of the members of each pair constituting a key, the other member of the said pair constituting a companion keyway, two sides of each such keyway being disposed substantially parallel to a plane passing through the axis of rotation of said disc and the longitudinal axis of said corresponding key, the pairs of said members being disposed to provide sliding movement of the key within the cooperative companion keyway in an axial direction and also providing limited radial movement with respect to the axis of rotation of said disc.
Claim 2
Dependent Claim
237 words
In a disc brake having a rotatable disc: a nonrotatable support, a pair of axially aligned relatively axially movable friction element assemblies of arcuate form disposed one on each side of said disc and having friction pads arranged to engage a minor portion of the disc area, and a brake-applying mechanism arranged to apply a brake-applying force against said friction element assemblies along a line of action which is nonintersecting with said friction pads guide means associated with said support and with at least one of said friction assemblies and arranged to provide guided movement of said friction element assembly in a brake-applying direction and to provide resistance to the braking dragloads thereon, said guide means comprising three pairs of interengaging guide members having uncommon instantaneous centers of rotation, members of each pair being associated respectively with said support and a respective one of said friction elements, one of the members of each pair constituting a key, the other member of the said pair constituting a companion keyway, two sides of each such keyway being disposed substantially parallel to a plane passing through the axis of rotation of said disc and the longitudinal axis of said corresponding key, the pairs of said members being disposed to provide sliding movement of the key within the cooperative companion keyway in an axial direction and also providing limited radial movement with respect to the axis of rotation of said disc.
Claim 3
Dependent Claim
32 words
A disc brake according to claim 1 wherein the guide members of each friction element assembly comprise axially extending keyways and the corresponding guide members on the support comprise axially extending keys.
Claim 4
Dependent Claim
46 words
A disc brake according to claim 1 wherein each friction element assembly comprises a pressure plate of part annular form, viewed in the axial direction of the disc, to which a friction pad assembly, comprising the friction pad and an associated backing plate, is detachably secured.
Claim 5
Dependent Claim
20 words
A disc brake according to claim 1 wherein the keys are bolted to a flange secured to the associated axle.
Claim 6
Dependent Claim
23 words
A disc brake according to claim 1 wherein the disc is of annular form secured at its outer periphery to a rotatable support.
Claim 7
Dependent Claim
22 words
A disc brake according to claim 1 wherein the keyways are formed on the radially inner edge of each friction element assembly.
Claim 8
Dependent Claim
49 words
A disc brake according to claim 6 wherein one of the keyways is arranged centrally on the axis of symmetry of each friction element assembly, considered in the axial direction, and two other keyways are arranged one on each side of the central keyway and at equal distances therefrom.
Claim 9
Dependent Claim
30 words
A disc brake according to claim 7 wherein the common instantaneous center of the two outer keyways is arranged to coincide with the shear center of each friction element assembly.
Claim 10
Dependent Claim
40 words
A disc brake according to claim 7 wherein the common instantaneous center of the two outer keyways is arranged to lie at a greater distance from the axis of the disc than the shear center of each friction element assembly.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |