US4155599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive gears for rack-driven mining machine
Assignee: Gebr Eickhoff Maschinenfabrik u Eisengiesserei GmbH
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Filing: 1977-12-22
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Granted: 1979-05-22
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Expires: 1997-12-22
Abstract
Abstract Drive gears with unique teeth profiles drivingly couple the output shaft of a drive on a drum-cutter mining machine to a rack extending along the course of travel of the mining machine. A prime mover on the mining machine is coupled to a drive gearwheel having gear teeth with tooth flanks defined by segments of a hypocycloid. These gear teeth mesh with a rack drive gearwheel having gear teeth with tooth flanks defined by segments of an epicycloid. The gear teeth of the rack drive gearwheel have a slender profile to penetrate into the spaces between pins forming part of a guide rail rack.
Inventors
- 👤 Hans Groger
- 👤 Dieter Lauterbach
- 👤 Wolfgang Ruchatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:56
CPC Classifications
E; E21; E21C; E21C29/00; E21C29/02; B; B61; B61C; B61C11/00; B61C11/04; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
In a drum-cutter mining machine of the type which carries a prime mover coupled to rotate a drive gearwheel which drivingly engages a rack drive gearwheel that, in turn, drivingly engages a guide rail having means forming rack teeth, said guide rail extending along the course of travel by said drum-cutter mining machine at the working face of a mine, the combination therewith of the improvement comprising said drive gearwheel having gear teeth with tooth flanks thereof defined by segments of a hypocycloid, and said rack drive gearwheel having gear teeth with tooth flanks thereof defined by segments of an epicycloid.
Claim 2
Dependent Claim
101 words
In a drum-cutter mining machine of the type which carries a prime mover coupled to rotate a drive gearwheel which drivingly engages a rack drive gearwheel that, in turn, drivingly engages a guide rail having means forming rack teeth, said guide rail extending along the course of travel by said drum-cutter mining machine at the working face of a mine, the combination therewith of the improvement comprising said drive gearwheel having gear teeth with tooth flanks thereof defined by segments of a hypocycloid, and said rack drive gearwheel having gear teeth with tooth flanks thereof defined by segments of an epicycloid.
Claim 3
Dependent Claim
20 words
The improvement according to claim 1 wherein said hypocycloid and epicycloid are generated about rolling circles having the same diameter.
Claim 4
Dependent Claim
46 words
The improvement according to claim 2 wherein said means forming rack teeth includes drive pins at parallel and spaced-apart locations along each of a plurality of guide rack segments arranged in an end-to-end relation to extend along the course of travel by said drum-cutter mining machine.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |