Patent US3770997A successfully refreshed from Google Patents.
US3770997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary actuator
Assignee: Bendix Corp
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Filing: 1971-08-24
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Granted: 1973-11-06
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Expires: 1991-08-24
Abstract
Abstract A rotary actuator of the type in which an eccentrically positioned floating rotor is orbited about the axis of an output member drivingly engaged therewith and adapted to be driven by the rotor orbiting motion, featuring an arrangement providing magnetic forces acting on the rotor so as to maintain the output member and rotor in engagement as the rotor orbits about the output member axis, taking the form of permanent ring magnets disposed to create a toroidal magnetic field about the output member axis so as to magnetically attract the rotor in a direction to maintain its engagement with the output member as it orbits about the output member axis.
Inventors
- 👤 R Presley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:23
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
An actuator comprising: a rotor; an output member; a fixed reaction member; means for orbiting said rotor about the axis of said output member in engagement therewith and with said reaction member to thereby drive said output member; magnetic field means creating a toroidal magnetic field said toroidal magnetic field extending about the axis of said output member proximate said rotor and such that as said rotor orbits about said axis the magnetic force produced by said toroidal magnetic field acting on said rotor is greatest at the angular position wherein said rotor is nearest said axis, said magnetic field means including a permanently magnetized ring substantially centered on said output member axis and proximate said rotor, whereby a resultant magnetic force is produced at said point aligned with the angular position of said rotor at said point.
Claim 2
Dependent Claim
138 words
An actuator comprising: a rotor; an output member; a fixed reaction member; means for orbiting said rotor about the axis of said output member in engagement therewith and with said reaction member to thereby drive said output member; magnetic field means creating a toroidal magnetic field said toroidal magnetic field extending about the axis of said output member proximate said rotor and such that as said rotor orbits about said axis the magnetic force produced by said toroidal magnetic field acting on said rotor is greatest at the angular position wherein said rotor is nearest said axis, said magnetic field means including a permanently magnetized ring substantially centered on said output member axis and proximate said rotor, whereby a resultant magnetic force is produced at said point aligned with the angular position of said rotor at said point.
Claim 3
Dependent Claim
44 words
The actuator of claim 1 wherein said magnetic field means further includes means providing a closed magnetic flux path defined in part by said rotor and entirely through ferromagnetic material in the vicinity of the point of engagement between said rotor and output member.
Claim 4
Dependent Claim
88 words
The actuator of claim 2 wherein said means providing a closed magnetic flux path includes at least one ferromagnetic ring element disposed concentric with an axially adjacent said permanently magnetized ring and engaging said rotor at the angular position of said rotors engagement with said output member, whereby said ring element defines in part a magnetic flux path through said rotor entirely of ferromagnetic material to create a resultant magnetic force action on said rotor in the vicinity of said angular position to thereby produce said hold-in force.
Claim 5
Dependent Claim
153 words
In an actuator of the type in which a rotor is orbited by an actuation means about the axis of an output member and in driving engagement therewith and with a reaction element to provide an output rotation of the output member the improvement comprising: magnetic field means separate from said actuation means creating a resultant magnetic force acting on said rotor tending to maintain said rotor engagement with said output member, including means creating a toroidal magnetic field with said toroidal magnetic field extending about the axis of said output member proximate said rotor and such that as said rotor orbits about said axis the magnetic force acting on said rotor is greatest at the angular position wherein said rotor is nearest said axis, said means including a permanently magnetized ring substantially centered on said output member axis and proximate said rotor, whereby said resultant magnetic force is produced at said point.
Claim 6
Dependent Claim
153 words
In an actuator of the type in which a rotor is orbited by an actuation means about the axis of an output member and in driving engagement therewith and with a reaction element to provide an output rotation of the output member the improvement comprising: magnetic field means separate from said actuation means creating a resultant magnetic force acting on said rotor tending to maintain said rotor engagement with said output member, including means creating a toroidal magnetic field with said toroidal magnetic field extending about the axis of said output member proximate said rotor and such that as said rotor orbits about said axis the magnetic force acting on said rotor is greatest at the angular position wherein said rotor is nearest said axis, said means including a permanently magnetized ring substantially centered on said output member axis and proximate said rotor, whereby said resultant magnetic force is produced at said point.
Claim 7
Dependent Claim
44 words
The actuator of claim 4 wherein said magnetic field means fuRther includes means providing a closed magnetic flux path defined in part by said rotor and entirely through ferromagnetic material in the vicinity of the point of engagement between said rotor and output member.
Claim 8
Dependent Claim
88 words
The actuator of claim 5 wherein said means providing a closed magnetic flux path includes at least one ferromagnetic ring element disposed concentric with and axially adjacent said permanently magnetized ring and engaging said rotor at the angular position of said rotors engagement with said output member, whereby said ring element defines in part a magnetic flux path through said rotor entirely of ferromagnetic material to create a resultant magnetic force acting on said rotor in the vicinity of said angular position to thereby produce said hold-in force.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |