US3828895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-energizing and self-aligning double-acting brake assembly
Assignee: Individual
•
Filing: 1973-02-22
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Granted: 1974-08-13
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Expires: 1993-02-22
Abstract
Abstract A double-acting brake assembly comprising a drum mounted on a rotary shaft, a brake band with looped ends surrounding the drum, and actuator means to displace ends of the band toward one another, is provided with a mounting bracket having spaced reaction surfaces which cooperate with the ends of the band to permit the band to wrap onto the drum for braking the drum when rotating in either the clockwise or counterclockwise directions. The reaction surfaces extend widthwise of the band adjacent the periphery of the drum, and a pair of guide surfaces extend alongside the ends of the band for aligning the band axially of the drum. In one embodiment, the bracket has an L-shaped crosssection with a flange overlying the drum and the reaction and guide surfaces are provided by the edges of an aperture in the flange. Other forms of brackets, including a bracket combined with a dust cover, are also disclosed. A preferred form of actuator includes a flexible sheath and cable assembly having one end connected to an operating lever and the other end connected to the ends of the band. The actuator draws the looped ends of the band together to engage the band with the drum, but allows lost motion between the end loops and the reaction surfaces of the mounting bracket. The end loops are free to move against either reaction surface, so that no matter which direction the drum is rotating, it will be the end loop at the leading end of the band which engages a reaction surface, and the trailing end of the band will in every case be free to wrap about the drum to provide a servo or self-energizing braking action. This will provide self-energizing braking on both forward and reverse rotation of the drum.
Inventors
- 👤 E Boaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:16
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/28; F16D49/00; F16D49/08; F16D49/10; F16D2121/00; F16D2121/14; F16D2125/00; F16D2125/18; F16D2125/58; F16D2125/60
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
244 words
For use in a brake assembly including a drum rotatable on an axis, a band disposed around the periphery of said drum, said band having ends with portions spaced from one another and extending away from said periphery, and actuator means for displacing said ends in a direction to cause said band to engage said drum, including an elongated element slidably received by one end and secured to the other, a mounting bracket for reacting with said ends to limit rotation of said band in opposite directions about said axis when engaged with said drum, said bracket having a reaction flange with an aperture having edges defining a pair of reaction surfaces spaced apart a distance greater than the corresponding spacing of said end portions for loosely receiving said end portions therebetween and defining a pair of guide surfaces extending between said reaction surfaces for engaging laterally of said end portions to limit movement of said band axially of said drum, said bracket also having a mounting flaNge extending along one side thereof at an angle away from said reaction flange for securement adjacent said drum, and including clamping means carried by said other band end and displaceable transversely to said element for releasably connecting said element to said other band end to afford longitudinal adjustment of said element, said clamping means being exposed opposite said mounting flange so as to be operable from the side of the reaction flange opposite the mounting flange.
Claim 2
Dependent Claim
244 words
For use in a brake assembly including a drum rotatable on an axis, a band disposed around the periphery of said drum, said band having ends with portions spaced from one another and extending away from said periphery, and actuator means for displacing said ends in a direction to cause said band to engage said drum, including an elongated element slidably received by one end and secured to the other, a mounting bracket for reacting with said ends to limit rotation of said band in opposite directions about said axis when engaged with said drum, said bracket having a reaction flange with an aperture having edges defining a pair of reaction surfaces spaced apart a distance greater than the corresponding spacing of said end portions for loosely receiving said end portions therebetween and defining a pair of guide surfaces extending between said reaction surfaces for engaging laterally of said end portions to limit movement of said band axially of said drum, said bracket also having a mounting flaNge extending along one side thereof at an angle away from said reaction flange for securement adjacent said drum, and including clamping means carried by said other band end and displaceable transversely to said element for releasably connecting said element to said other band end to afford longitudinal adjustment of said element, said clamping means being exposed opposite said mounting flange so as to be operable from the side of the reaction flange opposite the mounting flange.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1 wherein said mounting flange is integral with said reaction flange and extends outwardly of said axis beyond said end portions of said band.
Claim 4
Dependent Claim
213 words
In a brake assembly including a brake drum, a band operatively associated with said drum and having ends disposed in spaced relation, and actuator means for displacing said ends in a direction to cause said band to engage said drum, including a cable element connected to one of said ends, a sheath telescopically receiving said cable element and having a movable abutment surface confronting the other of said ends, and means providing a slidable connection between said cable and said other end to slidably receive said cable element, the improvement comprising: bracket means having a reaction flange providing a pair of reaction surfaces extending widthwise of said band and spaced apart to receive said band-ends therebetween, said reaction flange also having a pair of guide surfaces extending laterally of said band-ends between said reaction surfaces, each reaction surface being coextensive with the widthwide dimension of its associated band-end, and said reaction and guide surfaces loosely embracing said band-ends, said bracket means further having a mounting flange extending away from said reaction flange for securing the bracket means adjacent said drum periphery, so that when said cable element is telescoped into said sheath, said ends are drawn together and said cable and sheath move freely therewith for causing the band to engage the drum.
Claim 5
Dependent Claim
213 words
In a brake assembly including a brake drum, a band operatively associated with said drum and having ends disposed in spaced relation, and actuator means for displacing said ends in a direction to cause said band to engage said drum, including a cable element connected to one of said ends, a sheath telescopically receiving said cable element and having a movable abutment surface confronting the other of said ends, and means providing a slidable connection between said cable and said other end to slidably receive said cable element, the improvement comprising: bracket means having a reaction flange providing a pair of reaction surfaces extending widthwise of said band and spaced apart to receive said band-ends therebetween, said reaction flange also having a pair of guide surfaces extending laterally of said band-ends between said reaction surfaces, each reaction surface being coextensive with the widthwide dimension of its associated band-end, and said reaction and guide surfaces loosely embracing said band-ends, said bracket means further having a mounting flange extending away from said reaction flange for securing the bracket means adjacent said drum periphery, so that when said cable element is telescoped into said sheath, said ends are drawn together and said cable and sheath move freely therewith for causing the band to engage the drum.
Claim 6
Dependent Claim
42 words
Apparatus according to claim 3 including means carried by said one end of said band for mounting said cable element to pivot relative to said band and means mounting said slidable connection to pivot relative to the other end of said band.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 4 wherein said ends of said band have reversely turned loops with slots extending lengthwise of the band, and said cable mounting means include pins rotatably mounted in said loops.
Claim 8
Dependent Claim
41 words
Apparatus according to claim 5 wherein said pin carried by the loop on said one end has a transverse bore for receiving said cable element, and clamping means displaceable axially of said pin for securing said cable element in said pin.
Claim 9
Dependent Claim
27 words
Apparatus according to claim 6 wherein said clamping means includes a threaded bore extending axially in said pin and a threaded fastener mounted in said axial bore.
Claim 10
Dependent Claim
44 words
Apparatus according to claim 3 wherein said bracket means includes a cover portion surrounding the periphery of said band and extending in a plane transverse to the rotational axis of the drum for enclosing substantially the entire periphery of the band and the drum.
Claim 11
Dependent Claim
25 words
Apparatus according to claim 3 including elastic means normally urging said ends into engagement with said reaction surfaces to space said band from said drum.
Claim 12
Dependent Claim
22 words
Apparatus according to claim 9 wherein said elastic means includes a compression spring engaging between said band-ends and surrounding said cable element.
Claim 13
Dependent Claim
241 words
In a vehicle having a frame element, a shaft mounted to rotate relative to the frame element, a drum fixedly mounted to the shaft, a brake band surrounding said drum and having ends disposed in spaced relation adjacent said frame element, the improvement comprising: bolt means extending away from said frame element and providing a pair of reaction surfaces extending widthwise of said band-ends in spaced relation for engaging said ends loosely therebetween to limit rotational of said band relative to said drum, guidE surface means carried on said bolt means a spaced distance from said frame and extending laterally of said band-ends for positioning said band axially relative to said drum, and actuator means for urging said ends toward one another including a flexible sheath having one end fixedly connected to said frame and another end engageable against one end of said brake band, a flexible cable within said sheath, said cable having one end connected to an operator displaceable relative to the frame and having another end connected to the other end of said brake band, said sheath and cable being disposed relative to the frame to permit the unconnected end of the sheath to engage its associated end of the brake band and to move therewith relative to said frame when said operator is energized to telescope said cable into said sheath with said cable and sheath moving freely relative to said frame substantially tangentially to said drum.
Claim 14
Dependent Claim
241 words
In a vehicle having a frame element, a shaft mounted to rotate relative to the frame element, a drum fixedly mounted to the shaft, a brake band surrounding said drum and having ends disposed in spaced relation adjacent said frame element, the improvement comprising: bolt means extending away from said frame element and providing a pair of reaction surfaces extending widthwise of said band-ends in spaced relation for engaging said ends loosely therebetween to limit rotational of said band relative to said drum, guidE surface means carried on said bolt means a spaced distance from said frame and extending laterally of said band-ends for positioning said band axially relative to said drum, and actuator means for urging said ends toward one another including a flexible sheath having one end fixedly connected to said frame and another end engageable against one end of said brake band, a flexible cable within said sheath, said cable having one end connected to an operator displaceable relative to the frame and having another end connected to the other end of said brake band, said sheath and cable being disposed relative to the frame to permit the unconnected end of the sheath to engage its associated end of the brake band and to move therewith relative to said frame when said operator is energized to telescope said cable into said sheath with said cable and sheath moving freely relative to said frame substantially tangentially to said drum.
Claim 15
Dependent Claim
29 words
Apparatus according to claim 11 wherein said bolt means includes a U-bolt having parallel legs providing said reaction surfaces and nut means connecting said legs to said frame element.
Claim 16
Dependent Claim
294 words
A mounting bracket for use with a brake assembly including a drum rotatable on an axis, a resilient brake band disposed around the periphery of said drum and having reversely-turned ends forming loops at the ends of the band with said loops projecting outwardly from the periphery of the band, and actuator means engaged with said loops for drawing the same toward each other to cause the band to engage the drum in braking relation therewith, said mounting bracket having a reaction flange with an aperture providing a pair of reaction surfaces extending widthwise of the band and providing a pair of guide surfaces extending between said reaction surfaces, said reaction surfaces being spaced apart a distance to receive said loops and loosely embrace them therebetween and to be resiliently engaged by said loops when the band is in a deactivated condition, said reaction flange being spaced radially from the drum a distance sufficient to receive the ends of the band loosely between the reaction surfaces but less than the maximum outward projection of the loops, said actuator means including a sheathed cable connected to the loops above said reaction flange and extending alongside said reaction flange closely-adjacent thereto in a manner providing free movement of the loops between the reaction surfaces, said bracket also having a mounting flange for securing the reaction flange at said distance, so that when the band is engaged with the rotating drum the loops move between the reaction surfaces in a direction corresponding to the rotational direction of the drum with one loop leading the other and being carried forwardly in the direction of drum rotation against its associated reaction surface, whereby the other end of the band wraps onto the drum to provide a self-energizing braking action.
Claim 17
Dependent Claim
294 words
A mounting bracket for use with a brake assembly including a drum rotatable on an axis, a resilient brake band disposed around the periphery of said drum and having reversely-turned ends forming loops at the ends of the band with said loops projecting outwardly from the periphery of the band, and actuator means engaged with said loops for drawing the same toward each other to cause the band to engage the drum in braking relation therewith, said mounting bracket having a reaction flange with an aperture providing a pair of reaction surfaces extending widthwise of the band and providing a pair of guide surfaces extending between said reaction surfaces, said reaction surfaces being spaced apart a distance to receive said loops and loosely embrace them therebetween and to be resiliently engaged by said loops when the band is in a deactivated condition, said reaction flange being spaced radially from the drum a distance sufficient to receive the ends of the band loosely between the reaction surfaces but less than the maximum outward projection of the loops, said actuator means including a sheathed cable connected to the loops above said reaction flange and extending alongside said reaction flange closely-adjacent thereto in a manner providing free movement of the loops between the reaction surfaces, said bracket also having a mounting flange for securing the reaction flange at said distance, so that when the band is engaged with the rotating drum the loops move between the reaction surfaces in a direction corresponding to the rotational direction of the drum with one loop leading the other and being carried forwardly in the direction of drum rotation against its associated reaction surface, whereby the other end of the band wraps onto the drum to provide a self-energizing braking action.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |