US3814962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic worm drive
Assignee: Individual
•
Filing: 1972-11-22
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Granted: 1974-06-04
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Expires: 1992-11-22
Abstract
Abstract A magnetic worm gear drive includes a worm gear having a helical tooth of permanent magnet material. A worm wheel has a plurality of circumferentially spaced teeth of permanent magnet material. The teeth on the worm wheel interdigitate with the tooth on the worm gear. The teeth are magnetized so that like poles on the worm gear tooth and worm wheel teeth face one another. Rotation of the worm gear causes rotation of the worm wheel by magnetic repulsion.
Inventors
- 👤 M Baermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
F; F16; F16H; F16H49/00; F16H49/005; H; H02; H02K; H02K49/00; H02K49/10; H02K49/102
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A magnetic worm gear including a continuous helical tooth of permanent magnet material having opposite side surface portions, said tooth being magnetized to provide at least a pair of continuous magnetic poles of opposite magnetic polarity one on each side surface between which pole lines of magnetic force extend and project outwardly of said side surface portions.
Claim 2
Dependent Claim
57 words
A magnetic worm gear including a continuous helical tooth of permanent magnet material having opposite side surface portions, said tooth being magnetized to provide at least a pair of continuous magnetic poles of opposite magnetic polarity one on each side surface between which pole lines of magnetic force extend and project outwardly of said side surface portions.
Claim 3
Dependent Claim
43 words
The gear of claim 1 wherein substantially the entire surface of one of said side surface portions defines one of said magnetic poles and substantially the entire surface of the other of said side surface portions defines the other of said magnetic poles.
Claim 4
Dependent Claim
42 words
The gear of claim 1 wherein there are a first pair of spaced-apart magnetic poles of opposite polarity on one of said side surfaces and a second pair of spaced-apart magnetic poles of opposite polarity on the other of said side surfaces.
Claim 5
Dependent Claim
14 words
The gear of claim 1 wherein said gear includes a core of non-magnetic material.
Claim 6
Dependent Claim
22 words
The gear of claim 1 and further including a coating of non-magnetic wear resistant material on at least said side surface portions.
Claim 7
Dependent Claim
31 words
The gear of claim 1 and further including binding means on said helical tooth for holding said tooth together against action of centrifugal force during high speed rotation of said gear.
Claim 8
Dependent Claim
100 words
The gear of claim 1 and further including a worm wheel having a plurality of worm wheel teeth of permanent magnet material including opposite side surfaces, each of said worm wheel teeth being magnetized to provide at least a pair of magnetic poles of opposite polarity thereon one on each side surface between which lines of magnetic force extend and project outwardly of said side surfaces thereof, said helical tooth and worm wheel teeth being interdigitated whereby said lines of magnetic force repulse one another for rotatably driving said worm wheel by magnetic repulsion upon rotation of said worm gear.
Claim 9
Dependent Claim
54 words
A magnetic gear including a plurality of circumferentially-spaced teeth of permanent magnet material having opposite side surfaces, each of said teeth being magnetized to provide at least a pair of magnetic poles of opposite polarity one on each side surface between which lines of magnetic force extend and project outwardly of said side surfaces.
Claim 10
Dependent Claim
54 words
A magnetic gear including a plurality of circumferentially-spaced teeth of permanent magnet material having opposite side surfaces, each of said teeth being magnetized to provide at least a pair of magnetic poles of opposite polarity one on each side surface between which lines of magnetic force extend and project outwardly of said side surfaces.
Claim 11
Dependent Claim
41 words
The gear of claim 8 wherein substantially the entire surface of one of said side surfaces defines one of said magnetic poles and substantially the entire surface of the other of said side surfaces defines the other of said magnetic poles.
Claim 12
Dependent Claim
42 words
The gear of claim 8 wherein there are a first pair of spaced-apart magnetic poles of opposite polarity on one of said side surfaces and a second pair of spaced-apart magnetic poles of opposite polarity on the other of said side surfaces.
Claim 13
Dependent Claim
18 words
The gear of claim 8 and further including a covering of non-magnetic wear resistant material on said teeth.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |