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US3763993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pinch roll drive for endless conveyor belt
Assignee: MC DOWELL WELLMAN ENG CO
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Filing: 1972-07-28
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Granted: 1973-10-09
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Expires: 1992-07-28
Abstract
Abstract There is provided a pinch roll drive for long distance conveyor belts. These drives are located at intervals along the belt and depend upon driving wheels frictionally engaging marginal drive edges of an endless conveyor belt. Pairs of wheels which may be separately driven are disposed above and below a given reach of the belt and traction loaded.
Inventors
- 👤 R Whikehart
- 👤 R Patrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:15
CPC Classifications
B; B65; B65G; B65G23/00; B65G2811/00; B65G2811/09; B65G2811/091; B65G2811/092
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
220 words
A drive unit for an endless conveyor belt having upper and lower reaches and marginal drive edges comprising in combination: a. a frame adapted to span the upper reach of an endless conveyor belt intermediate the extremities of the upper reach thereof; b. a first axle mounted in said frame for disposition normal to the direction of travel of said endless belt and spanning the marginal drive edges of said belt; c. a pair of upper drive wheels mounted on and rotatable with said first axle for driving engagement with the upper surfaces of the marginal drive edges, respectively, of the upper reach of said belt; d. a second axle mounted in said frame parallel to said first axle and spanning the marginal drive edges of said belt; e. a pair of lower drive wheels mounted on and rotatable with said second axle for driving engagement with the under surface of the marginal drive edges, respectively, of the upper reach of said belt and opposite the drive wheels mounted on said first axle; f. means for rotatably driving said first axle; g. separate means for rotatably driving said second axle; and h. means for traction loading between said first and second axles to pinch the respective marginal drive edges of the upper reach between the upper and lower drive wheels.
Claim 2
Dependent Claim
220 words
A drive unit for an endless conveyor belt having upper and lower reaches and marginal drive edges comprising in combination: a. a frame adapted to span the upper reach of an endless conveyor belt intermediate the extremities of the upper reach thereof; b. a first axle mounted in said frame for disposition normal to the direction of travel of said endless belt and spanning the marginal drive edges of said belt; c. a pair of upper drive wheels mounted on and rotatable with said first axle for driving engagement with the upper surfaces of the marginal drive edges, respectively, of the upper reach of said belt; d. a second axle mounted in said frame parallel to said first axle and spanning the marginal drive edges of said belt; e. a pair of lower drive wheels mounted on and rotatable with said second axle for driving engagement with the under surface of the marginal drive edges, respectively, of the upper reach of said belt and opposite the drive wheels mounted on said first axle; f. means for rotatably driving said first axle; g. separate means for rotatably driving said second axle; and h. means for traction loading between said first and second axles to pinch the respective marginal drive edges of the upper reach between the upper and lower drive wheels.
Claim 3
Dependent Claim
112 words
A drive unit in accordance with claim 1 additionally including: i. a third axle mounted in said frame parallel to said first axle and spanning the marginal drive edges of said belt; j. a pair of wheels mounted on and rotatable with said third axle for engagement with the under surface of the marginal drive edges, respectively, of the lower reach of said belt and opposite the drive wheels mounted on said second axle; k. means for traction loading between said second and third axles to pinch the respective marginal drive edges of the lower reach between the lower drive wheels on said second axle and the wheels on said third axle.
Claim 4
Dependent Claim
23 words
A drive unit in accordance with claim 1 in which the drive wheels on said first and second axles include pneumatic rubber tires.
Claim 5
Dependent Claim
26 words
A drive unit in accordance with claim 1 in which the traction loading means includes extensible arm means coacting between the frame and the first axle.
Claim 6
Dependent Claim
40 words
A drive unit in accordance with claim 4 in which the extensible arm means includes a pair of hydraulically actuated jacks adjacent each drive wheel, a source of liquid under pressure and means for controlling the flow of such liquid.
Claim 7
Dependent Claim
28 words
A drive unit in accordance with claim 1 in which the traction loading means includes means for equalizing the loading at each drive wheel on a given axle.
Claim 8
Dependent Claim
41 words
A drive unit in accordance with claim 6 in which the equalizing means includes a single source of hydraulic fluid under pressure, a T-connection, and separate lines including check valves leading to separate hydraulically actuated jacks located adjacent each drive wheel.
Claim 9
Dependent Claim
36 words
A drive unit in accordance with claim 1 in which the means for driving the first and second axles each includes a shaft mounted reducer, a motor, and pulley-and-belt means connecting the motor to the reducer.
Claim 10
Dependent Claim
27 words
A drive unit in accordance with claim 3 including a connection between the pneumatic tires on a given shaft whereby the pressure in each tire is equalized.
Claim 11
Dependent Claim
219 words
A drive unit for an endless conveyor belt having upper and lower reaches and marginal drive edges comprising in combination: a. a frame adapted to span the lower reach of an endless conveyor belt intermediate the extremities of the lower reach thereof; b. a first axle mounted in said frame for disposition normal to the direction of travel of said endless belt and spanning the marginal drive edges of said belt; c. a pair of upper drive wheels mounted on and rotatable with said axle for driving engagement with the upper surfaces of the marginal drive edges, respectively, of the lower reach of said belt; d. a second axle mounted in said frame parallel to said first axle and spanning the marginal drive edges of said belt; e. a pair of lower drive wheels mounted on and rotatable with said second axle for driving engagement with the under surface of the marginal drive edges, respectively, of the lower reach of said belt and opposite the drive wheels mounted on said first axle; f. means for rotatably driving said first axle; g. separate means for rotatably driving said second axle; and h. means for traction loading between said first and second axles to pinch the respective marginal drive edges of the lower reach between the upper and lower drive wheels.
Claim 12
Dependent Claim
219 words
A drive unit for an endless conveyor belt having upper and lower reaches and marginal drive edges comprising in combination: a. a frame adapted to span the lower reach of an endless conveyor belt intermediate the extremities of the lower reach thereof; b. a first axle mounted in said frame for disposition normal to the direction of travel of said endless belt and spanning the marginal drive edges of said belt; c. a pair of upper drive wheels mounted on and rotatable with said axle for driving engagement with the upper surfaces of the marginal drive edges, respectively, of the lower reach of said belt; d. a second axle mounted in said frame parallel to said first axle and spanning the marginal drive edges of said belt; e. a pair of lower drive wheels mounted on and rotatable with said second axle for driving engagement with the under surface of the marginal drive edges, respectively, of the lower reach of said belt and opposite the drive wheels mounted on said first axle; f. means for rotatably driving said first axle; g. separate means for rotatably driving said second axle; and h. means for traction loading between said first and second axles to pinch the respective marginal drive edges of the lower reach between the upper and lower drive wheels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |