US3784852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed selector, in particular for cranes or hoisting gears
Assignee: Manitowoc Crane Group France SAS
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Filing: 1972-08-01
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Granted: 1974-01-08
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Expires: 1992-08-01
Abstract
Abstract The invention relates to a speed selector. The belts drive the inductor of an eddy-current clutch. When the latter is energized together with the yoke, which puts off the brake against the action of the spring, the shaft is caused to rotate. The speed variation is obtained by varying the current intensity in the inductor.
Inventors
- 👤 J Noly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:34
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043; B; B66; B66D; B66D5/00; F; F16; F16D; F16D67/00; F16D67/02; F16D67/06; B66D2700/00; B66D2700/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A safety speed-varying device, in particular for cranes or hoisting gears, characterized in that it includes: a driving member integral with the inductor rotor of an eddycurrent clutch; a bell capping said inductor to complete the eddy-current clutch, said bell being keyed to a shaft housed at the center of the hollow shaft of the inductor and the driving member; a braking disc adapted to be rotatively driven by one of the ends of the shaft of the bell; a brake-lining holder adjacent said disc, unable to rotate but movable in the axial direction; a spring system automatically returning the brake-lining holder to its braking position on the disc; a wound yoke, housed behind the brake-lining holder, said yoke, when supplied with electric current, attracting said holder to a non-braking position against the action of the spring system; an output tip, constituted by the free end of the shaft of the bell of the eddy-current clutch.
Claim 2
Dependent Claim
156 words
A safety speed-varying device, in particular for cranes or hoisting gears, characterized in that it includes: a driving member integral with the inductor rotor of an eddycurrent clutch; a bell capping said inductor to complete the eddy-current clutch, said bell being keyed to a shaft housed at the center of the hollow shaft of the inductor and the driving member; a braking disc adapted to be rotatively driven by one of the ends of the shaft of the bell; a brake-lining holder adjacent said disc, unable to rotate but movable in the axial direction; a spring system automatically returning the brake-lining holder to its braking position on the disc; a wound yoke, housed behind the brake-lining holder, said yoke, when supplied with electric current, attracting said holder to a non-braking position against the action of the spring system; an output tip, constituted by the free end of the shaft of the bell of the eddy-current clutch.
Claim 3
Dependent Claim
50 words
A speed-varying device according to claim 1, characterized in that the braking disc is freely movable in the axial direction on the shaft of the bell, so that its rotation takes place between the movable lining on the lining holder and a fixed braking lining located on its opposite face.
Claim 4
Dependent Claim
38 words
A speed-varying device according to claim 1, characterized in that the braking disc is rigidly integral with the shaft of the bell, and includes one friction face only, on which the lining of the lining holder can act.
Claim 5
Dependent Claim
23 words
A speed-varying device according to claim 1, means for further including varying at will the current intensity in the inductor of the clutch.
Claim 6
Dependent Claim
55 words
A speed-varying device according to claim 1, comprising means to stop the motion by cutting off the supply of current to the inductor and the wound yoke of the brake, so that the reduction gear according to the invention is a safety device which is blocked automatically in the event of a failure of current.
References Cited (Backward Citations)
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US2628321A
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |