Patent US4294321A successfully refreshed from Google Patents.
Patent US3954020A successfully refreshed from Google Patents.
US3954020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotational drive assembly
Assignee: Manitowoc Co Inc
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Filing: 1975-04-24
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Granted: 1976-05-04
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Expires: 1995-04-24
Abstract
Abstract A rotational drive assembly including a pair of pinion gears journalled on idler shafts disposed laterally on either side of a drive shaft and meshing with the teeth of a drive gear and a ring gear. The drive shaft is universally journalled for rotation and for permitting a limited range of movement of the drive gear toward and away from the ring gear to substantially equalize tooth contact between the drive gear and each of the pinion gears as the drive shaft is rotated. A slotted bearing may be provided to preclude excess lateral movement of the drive shaft.
Inventors
- 👤 John D. West
- 👤 James G. Morrow, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
F; F16; F16H; F16H1/00; F16H1/02; F16H1/20; F16H1/22; B; B66; B66C; B66C23/00; B66C23/62; B66C23/84; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19628
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A drive mechanism for causing relative movement between first and second parts comprising, in combination, a first gear mounted on said first part, a drive shaft carried on said second part, a drive gear secured to said shaft adjacent the teeth of said first gear, a pair of pinion gears journalled on idler shafts disposed laterally on either side of said drive shaft and meshing with the teeth of said drive gear and said first gear, and means on said second part journalling said drive shaft for rotation and for permitting a limited range of movement of said drive gear toward and away from said first gear to substantially equalize tooth contact force between said drive gear and each of said pinion gears as said drive shaft is rotated.
Claim 2
Dependent Claim
129 words
A drive mechanism for causing relative movement between first and second parts comprising, in combination, a first gear mounted on said first part, a drive shaft carried on said second part, a drive gear secured to said shaft adjacent the teeth of said first gear, a pair of pinion gears journalled on idler shafts disposed laterally on either side of said drive shaft and meshing with the teeth of said drive gear and said first gear, and means on said second part journalling said drive shaft for rotation and for permitting a limited range of movement of said drive gear toward and away from said first gear to substantially equalize tooth contact force between said drive gear and each of said pinion gears as said drive shaft is rotated.
Claim 3
Dependent Claim
20 words
A drive mechanism as defined in claim 1, wherein said means for journalling said drive shaft includes a self-aligning bearing.
Claim 4
Dependent Claim
41 words
A drive mechanism as defined in claim 1, wherein said first gear is an internally toothed ring gear and said drive shaft projects vertically within said ring gear with said drive gear disposed in the plane of said ring gear teeth.
Claim 5
Dependent Claim
30 words
A drive mechanism as defined in claim 3 wherein said means for journalling said drive shaft includes a self-aligning bearing and means for resisting lateral movement of said drive gear.
Claim 6
Dependent Claim
61 words
A drive mechanism as defined in claim 4 wherein said means for resisting lateral movement of said drive gear includes retainer means carried on said second part and defining a substantially horizontal slot having parallel sides extending longitudinally on opposite sides of said drive shaft and bearing means carried on said drive shaft for engagement with the sides of said slot.
Claim 7
Dependent Claim
46 words
A drive mechanism as defined in claim 5 wherein said bearing means carried on said drive shaft includes a bearing block having parallel lateral sides dimensioned for reception within said slot and a central circular aperture dimensioned to receive said lower end of said drive shaft.
Claim 8
Dependent Claim
45 words
A drive mechanism as defined in claim 6 wherein said bearing means also includes a circular bushing interposed between said drive shaft and said bearing block and substantially flat wear plates interposed between the sides of said bearing block and the sides of said slot.
Claim 9
Dependent Claim
35 words
A drive mechanism as defined in claim 1 wherein said first part is a base for a load handling device and said second part is a rotatable bed journalled for rotation relative to said base.
Claim 10
Dependent Claim
36 words
A drive mechanism as defined in claim 3 wherein said ring gear is mounted on a base for a load handling device and said drive shaft is carried on a bed rotatable relative to said base.
Claim 11
Dependent Claim
30 words
A drive mechanism as defined in claim 9 wherein said means for journalling said drive shaft includes a self-aligning bearing and means for resisting lateral movement of said drive gear.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |