US3700941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable hysteresis clutch and brake
Assignee: Individual
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Filing: 1971-02-03
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Granted: 1972-10-24
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Expires: 1991-02-03
Abstract
Abstract This hysteresis type magnetic device has a permanent magnet secured between two magnetizable pole members on a sleeve which is rotatably mounted on the output shaft coaxially thereof. One pole member is disposed within the other and has a plurality of axially extending external teeth or poles which confront but are radially spaced from a like plurality of internal teeth or poles on the outer pole member. A magnetizable, cup-shaped rotor is secured to the output shaft and has its annular wall projecting into the radial space between the inner and outer poles. The outer pole member is angularly adjustable relative to the inner to vary the angular separation between inner and outer poles, respectively, and hence to vary the transmittable torque in continuous slip braking and continuous or zero slip clutching connections.
Inventors
- 👤 John E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:01
CPC Classifications
H; H02; H02K; H02K49/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
231 words
A magnetic slip torque device, comprising a rotatable output shaft, a first magnetizable member rotatably mounted on said output shaft, an outer pole member mounted on said first member for rotatable adjustment thereon about the axis of said output shaft, said outer pole member having a plurality of internally projecting angularly spaced poles, a rotatable, magnetizable inner pole member axially aligned with said outer pole member and rotatably mounted on said output shaft, and having a plurality of externally projecting angularly spaced poles, equal in number to the number of poles on said outer pole member, said outer poles surrounding said inner poles in radially spaced confronting relation thereto, sand having a polarity different from said inner poles so that magnetic flux lines extend between said inner and outer poles, an annular permanent magnet rotatably mounted on said output shaft between said pole members in axial alignment therewith to rotate with said pole members and operative to develop a magnetic field between said inner and outer poles, a driven member secured to said output shaft and having an annular magnetizable portion projecting into the radial space between said inner and outer poles and magnetically coupled to said poles, and means for driving said first member, said pole members being angularly adjustable relative to one another about the axis of said output shaft to adjust the torque transmittable to said output shaft.
Claim 2
Dependent Claim
231 words
A magnetic slip torque device, comprising a rotatable output shaft, a first magnetizable member rotatably mounted on said output shaft, an outer pole member mounted on said first member for rotatable adjustment thereon about the axis of said output shaft, said outer pole member having a plurality of internally projecting angularly spaced poles, a rotatable, magnetizable inner pole member axially aligned with said outer pole member and rotatably mounted on said output shaft, and having a plurality of externally projecting angularly spaced poles, equal in number to the number of poles on said outer pole member, said outer poles surrounding said inner poles in radially spaced confronting relation thereto, sand having a polarity different from said inner poles so that magnetic flux lines extend between said inner and outer poles, an annular permanent magnet rotatably mounted on said output shaft between said pole members in axial alignment therewith to rotate with said pole members and operative to develop a magnetic field between said inner and outer poles, a driven member secured to said output shaft and having an annular magnetizable portion projecting into the radial space between said inner and outer poles and magnetically coupled to said poles, and means for driving said first member, said pole members being angularly adjustable relative to one another about the axis of said output shaft to adjust the torque transmittable to said output shaft.
Claim 3
Dependent Claim
46 words
A magnetic slip torque device as claimed in claim 1, wherein said first member, said permanent magnet, and said inner pole member are rotatably mounted on a sleeve which is fixed to said output shaft, and said driven member is also fixed to said output shaft.
Claim 4
Dependent Claim
117 words
A magnetic slip torque device as defined in claim 1, including a second plurality of inner, angularly spaced magnetic poles axially spaced from the first-named inner poles, and mounted to rotate with said first-named inner poles coaxially of said common axis, a second plurality of outer, angularly spaced magnetic poles surrounding said second plurality of inner poles in radially spaced confronting relation thereto, and mounted to rotate with said second plurality of inner poles, and a second driven member having a magnetizable annular portion projecting into the radial space between said second pluralities of inner and outer poles, respectively, thereby magnetically to be coupled to said second pluralities of poles for rotation therewith about said common axis.
Claim 5
Dependent Claim
166 words
A magnetic slip torque device, comprising a drive member, a driven member, and means mounting said members for rotation relative to one another about a common axis, said drive member comprising a first plurality of poles angularly spaced about said axis, and rotatable with said drive member, a second plurality of angularly spaced poles surrounding said first plurality in radially spaced confronting relation thereto, and rotatable therewith, and a permanent magnet secured to said drive member adjacent said first plurality of poles and operative to develop a magnetic field between said first and second pluralities of poles, respectively, and said driven member having an annular, magnetizable portion projecting into the radial space between said first and second pluralities of poles magnetically to be coupled to said drive member, and means for angularly adjusting one of said first and second pluralities of poles relative to the other about said axis thereby to adjust the torque transmittable by said magnetic field from said drive to said driven member.
Claim 6
Dependent Claim
166 words
A magnetic slip torque device, comprising a drive member, a driven member, and means mounting said members for rotation relative to one another about a common axis, said drive member comprising a first plurality of poles angularly spaced about said axis, and rotatable with said drive member, a second plurality of angularly spaced poles surrounding said first plurality in radially spaced confronting relation thereto, and rotatable therewith, and a permanent magnet secured to said drive member adjacent said first plurality of poles and operative to develop a magnetic field between said first and second pluralities of poles, respectively, and said driven member having an annular, magnetizable portion projecting into the radial space between said first and second pluralities of poles magnetically to be coupled to said drive member, and means for angularly adjusting one of said first and second pluralities of poles relative to the other about said axis thereby to adjust the torque transmittable by said magnetic field from said drive to said driven member.
Claim 7
Dependent Claim
109 words
A magnetic slip torque device as defined in claim 4, wherein said first plurality of poles are fixed to said drive member, said second plurality of poles are carried by a ring, which surrounds said drive member and is angularly adjustable thereon, said drive member has in its outer surface a reference hole, and said ring has therethrough a plurality of angularly spaced radial openings registrable selectively with said reference hole, upon angular adjustment of said ring on said drive member, said drive member being operative to transmit a different maximum torque to said driven member when different openings in said ring are in registry with said reference hole.
Claim 8
Dependent Claim
57 words
A magnetic slip torque device as defined in claim 5, wherein said drive member has a circumferential groove in its outer surface beneath said ring, and a setscrew is threaded through a radial opening in said ring and engaged at its inner end in said groove releasably to secure said ring against rotation on said drive member.
Claim 9
Dependent Claim
122 words
A magnetic hysteresis type torque device, comprising a rotatable drive member and a rotatable driven member, one of said members having a first set of magnetizable poles angularly spaced about its axis, and having a second set of magnetizable poles disposed in operative relation to said first set of poles but spaced therefrom, the other of said members having a magnetizable part projecting into the space between said first and second sets of poles, a permanent magnet secured to one of said members to rotate therewith, and operative magnetically to couple said members, and means for adjusting one of said sets of poles relative to the other set of poles about the axis of the member having the two sets of poles.
Claim 10
Dependent Claim
122 words
A magnetic hysteresis type torque device, comprising a rotatable drive member and a rotatable driven member, one of said members having a first set of magnetizable poles angularly spaced about its axis, and having a second set of magnetizable poles disposed in operative relation to said first set of poles but spaced therefrom, the other of said members having a magnetizable part projecting into the space between said first and second sets of poles, a permanent magnet secured to one of said members to rotate therewith, and operative magnetically to couple said members, and means for adjusting one of said sets of poles relative to the other set of poles about the axis of the member having the two sets of poles.
Claim 11
Dependent Claim
185 words
A magnetic hysteresis type torque device comprising a first rotatable member having a plurality of angularly spaced magnetic poles, a second member having a plurality of angularly spaced magnetic poles disposed in confronting relation to the poles of said first member, the poles of the two members having different polarity so that magnetic flux lines extend between said members, and means for angularly adjusting one of said members angularly relative to the other about the axis of rotation of said first member, thereby to vary the hysteresis of the device, to adjust the torque transmitted between said members, said device operating with incipient hysteresis torque and zero slip when the load thereon does not exceed the torque which said members are adjusted to transmit, and operating at continuous slip torque when the load on said device is equal to the torque which said members are adjusted to transmit, and said device operating with composite eddy current and hysteresis torque in proportion to the slippage between said members, the composite torque having the highest percentage of eddy currents when the poles are aligned face to face.
Claim 12
Dependent Claim
185 words
A magnetic hysteresis type torque device comprising a first rotatable member having a plurality of angularly spaced magnetic poles, a second member having a plurality of angularly spaced magnetic poles disposed in confronting relation to the poles of said first member, the poles of the two members having different polarity so that magnetic flux lines extend between said members, and means for angularly adjusting one of said members angularly relative to the other about the axis of rotation of said first member, thereby to vary the hysteresis of the device, to adjust the torque transmitted between said members, said device operating with incipient hysteresis torque and zero slip when the load thereon does not exceed the torque which said members are adjusted to transmit, and operating at continuous slip torque when the load on said device is equal to the torque which said members are adjusted to transmit, and said device operating with composite eddy current and hysteresis torque in proportion to the slippage between said members, the composite torque having the highest percentage of eddy currents when the poles are aligned face to face.
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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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |