US4877983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic force generating method and apparatus
Assignee: Individual
•
Filing: 1985-11-19
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Granted: 1989-10-31
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Expires: 2005-11-19
Abstract
Abstract A permanent magnet armature is magnetically propelled along a guided path by interaction with the field within a flux zone limited on either side of the path by an arrangement of permanent stator magnets.
Inventors
- 👤 Howard R. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:22
CPC Classifications
H; H02; H02K; H02K53/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
233 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet having magnetic poles of opposite polarity spaced from each other along said path to establish a magnetic field of limited extent movable with the armature and magnetic stator means for establishing a stationary magnetic flux zone along said path, the improvement comprising flux emitting surfaces of one polarity mounted on the stator means on opposite sides of said path for limiting said flux zone through which said path extends and means mounting the permanent armature magnet on the armature with the poles thereof orientated relative to said flux emitting surfaces on the stator means for unidirectionally propelling the armature along said path through the limited zone in response to magnetic interaction between the movable magnetic field and the limited flux zone, said magnetic stator means including a plurality of magnetic gate assemblies fixedly spaced from each other along said path and respectively establishing stationary magnetic fields, each of said gate assemblies including a plurality of interconnected bar magnets substantially bordering said limited flux zone exposing pole faces of opposite polarity in parallel spaced planes intersected by said path, and magnetic means connected to said interconnected bar magnets exposing one of the flux emitting surfaces of said one polarity perpendicular to said parallel planes for magnetic interaction of the stationary magnetic fields.
Claim 2
Dependent Claim
233 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet having magnetic poles of opposite polarity spaced from each other along said path to establish a magnetic field of limited extent movable with the armature and magnetic stator means for establishing a stationary magnetic flux zone along said path, the improvement comprising flux emitting surfaces of one polarity mounted on the stator means on opposite sides of said path for limiting said flux zone through which said path extends and means mounting the permanent armature magnet on the armature with the poles thereof orientated relative to said flux emitting surfaces on the stator means for unidirectionally propelling the armature along said path through the limited zone in response to magnetic interaction between the movable magnetic field and the limited flux zone, said magnetic stator means including a plurality of magnetic gate assemblies fixedly spaced from each other along said path and respectively establishing stationary magnetic fields, each of said gate assemblies including a plurality of interconnected bar magnets substantially bordering said limited flux zone exposing pole faces of opposite polarity in parallel spaced planes intersected by said path, and magnetic means connected to said interconnected bar magnets exposing one of the flux emitting surfaces of said one polarity perpendicular to said parallel planes for magnetic interaction of the stationary magnetic fields.
Claim 3
Dependent Claim
42 words
The combination of claim 1 wherein said armature magnet is curved between end faces at which said poles of opposite polarity are located, the end faces being orientated by the mounting means in converging relation to each other toward the guiding means.
Claim 4
Dependent Claim
180 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet having magnetic poles of opposite polarity spaced from each other along said path to establish a magnetic field of limited extent movable with the armature and magnetic stator means for establishing a stationary magnetic flux zone along said path, the improvement comprising flux emitting surfaces of one polarity mounted on the stator means on opposite sides of said path for limiting said flux zone through which said path extends and means mounting the permanent armature magnet on the armature with the poles faces thereof orientated relative to said flux emitting surfaces on the stator means for unidirectionally propelling the armature along said path through the limited zone in response to magnetic interaction between the movable magnetic field and the limited flux zone, said armature magnet being curved between end faces at which said poles of opposite polarity are located, the end faces being orientated by the mounting means in converging relation to each other toward the guiding means.
Claim 5
Dependent Claim
180 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet having magnetic poles of opposite polarity spaced from each other along said path to establish a magnetic field of limited extent movable with the armature and magnetic stator means for establishing a stationary magnetic flux zone along said path, the improvement comprising flux emitting surfaces of one polarity mounted on the stator means on opposite sides of said path for limiting said flux zone through which said path extends and means mounting the permanent armature magnet on the armature with the poles faces thereof orientated relative to said flux emitting surfaces on the stator means for unidirectionally propelling the armature along said path through the limited zone in response to magnetic interaction between the movable magnetic field and the limited flux zone, said armature magnet being curved between end faces at which said poles of opposite polarity are located, the end faces being orientated by the mounting means in converging relation to each other toward the guiding means.
Claim 6
Dependent Claim
202 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet having magnetic poles of opposite polarity spaced from each other along said path to establish a magnetic field of limited extent movable with the armature and magnetic stator means for establishing a stationary magnetic flux zone along said path, the improvement comprising flux emitting surfaces of one polarity mounted on the stator means on opposite sides of said path for limiting said flux zone through which said path extends and means mounting the permanent armature magnet on the armature with the poles thereof orientated relative to said flux emitting surfaces on the stator means for unidirectionally propelling the armature along said path through the limited zone in response to magnetic interaction between the movable magnetic field and the limited flux zone, said magnetic stator means including a pair of permanent magnet assemblies having continuous, confronting pole faces of said one polarity bordering said limited zone, each of said assemblies having means for varying magnetic field intensity in the flux zone along said path, and a second armature magnet connected to the first mentioned armature magnet in mirror image relation thereto.
Claim 7
Dependent Claim
202 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet having magnetic poles of opposite polarity spaced from each other along said path to establish a magnetic field of limited extent movable with the armature and magnetic stator means for establishing a stationary magnetic flux zone along said path, the improvement comprising flux emitting surfaces of one polarity mounted on the stator means on opposite sides of said path for limiting said flux zone through which said path extends and means mounting the permanent armature magnet on the armature with the poles thereof orientated relative to said flux emitting surfaces on the stator means for unidirectionally propelling the armature along said path through the limited zone in response to magnetic interaction between the movable magnetic field and the limited flux zone, said magnetic stator means including a pair of permanent magnet assemblies having continuous, confronting pole faces of said one polarity bordering said limited zone, each of said assemblies having means for varying magnetic field intensity in the flux zone along said path, and a second armature magnet connected to the first mentioned armature magnet in mirror image relation thereto.
Claim 8
Dependent Claim
39 words
The combination of claim 4 wherein said armature magnet is curved between end faces at which said poles of opposite polarity are located, the end faces being orientated by the mounting means in a plane parallel to said path.
Claim 9
Dependent Claim
157 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet mounted on the armature having magnetic poles of opposite polarity spaced from each other along said path, the improvement comprising a plurality of permanent magnet gate assemblies mounted in spaced relation to each other along said path establishing interacting stationary magnetic fields along said path, each of said assemblies including stator magnets interconnected in surrounding relation to said path and having pole faces of opposite polarity aligned with parallel planes intersected by said path and magnetic means fixed to the pole faces aligned with one of the parallel planes for interaction of the armature magnet with said stationary magnetic fields for unidirectional propulsion of the armature along said path, said magnetic means being an annular magnet having a radially inner pole surface of one polarity enclosing a magnetic flux zone through which said path extends.
Claim 10
Dependent Claim
157 words
In combination with a movable armature, means for guiding movement of the armature along a predetermined path and a permanent armature magnet mounted on the armature having magnetic poles of opposite polarity spaced from each other along said path, the improvement comprising a plurality of permanent magnet gate assemblies mounted in spaced relation to each other along said path establishing interacting stationary magnetic fields along said path, each of said assemblies including stator magnets interconnected in surrounding relation to said path and having pole faces of opposite polarity aligned with parallel planes intersected by said path and magnetic means fixed to the pole faces aligned with one of the parallel planes for interaction of the armature magnet with said stationary magnetic fields for unidirectional propulsion of the armature along said path, said magnetic means being an annular magnet having a radially inner pole surface of one polarity enclosing a magnetic flux zone through which said path extends.
References Cited (Backward Citations)
US4074153A
Cited
US4151431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |