Patent US3675756A successfully refreshed from Google Patents.
US3675756A
Expired / Lapsed
US
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Gantry scraper conveyor
Assignee: AMECO SA SA
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Filing: 1971-01-06
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Granted: 1972-07-11
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Expires: 1991-01-06
Abstract
Abstract A gantry scraper conveyor for storing or picking up material in a heap comprising in a substantially inverted V-shaped frame structure a primary arm and a secondary arm supporting a driven double endless chain resting on two opposite slopes of the heap of the material to be handled with a continuous scraper chain running firstly upwards along the primary arm and then downwardly along the secondary arm. The primary arm has a driving drum with sprockets at the lower end and a guide pulley at the top. Another guide pulley at the adjacent upper end of the secondary arm, so as to provide a short horizontal section therebetween, and a return drum with sprockets at the lower end of the secondary arm, and tractive effort compensating means incorporated in said secondary arm for cancelling the effort due to the upward movement of the chain along the secondary arm while maintaining a proper chain tension.
Inventors
- 👤 Louis Nass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:03
CPC Classifications
B; B65; B65G; B65G21/00; B65G21/10; B65G21/14; B65G65/00; B65G65/02; B65G65/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
Gantry scraper conveyor comprising, a primary arm and a secondary arm operable to a position resting upon the two opposite slopes of a heap of material to be stored or picked up, a single continuous scraper chain travelling along said primary arm and secondary arm, traction compensating means acting on the upper and lower runs of said scraper chain which are carried by said secondary arm, said compensating means comprising a carriage mounted for longitudinal movement on said secondary arm, secondary driving means carried by said movable carriage and in meshing engagement with the upper and lower runs of said scraper chain, and means for exerting on said movable carriage a tractive effort in a direction opposed to the direction of movement of the lower, upwardly moving run of the scraper chain in said secondary arm, said traction compensating means cancelling the effort due to the upward movement of the chain along said secondary arm, while maintaining said chain properly tensioned.
Claim 2
Dependent Claim
161 words
Gantry scraper conveyor comprising, a primary arm and a secondary arm operable to a position resting upon the two opposite slopes of a heap of material to be stored or picked up, a single continuous scraper chain travelling along said primary arm and secondary arm, traction compensating means acting on the upper and lower runs of said scraper chain which are carried by said secondary arm, said compensating means comprising a carriage mounted for longitudinal movement on said secondary arm, secondary driving means carried by said movable carriage and in meshing engagement with the upper and lower runs of said scraper chain, and means for exerting on said movable carriage a tractive effort in a direction opposed to the direction of movement of the lower, upwardly moving run of the scraper chain in said secondary arm, said traction compensating means cancelling the effort due to the upward movement of the chain along said secondary arm, while maintaining said chain properly tensioned.
Claim 3
Dependent Claim
33 words
Gantry scraper conveyor as set forth in claim 1, wherein said traction means comprises a spring anchored at one end to said movable carrraige and at the opposite end to said secondary arm.
Claim 4
Dependent Claim
38 words
Gantry scraper conveyor as set forth in claim 1, wherein said traction means comprise a cable anchored to said carriage, a return pulley over which said cable is caused to pass, and a counterweight attached to said cable.
Claim 5
Dependent Claim
63 words
Gantry scraper conveyor as set forth in claim 1, wherein said secondary driving means comprise first and second pairs of toothed wheels, means for rotatably driving at least one of said pairs of toothed wheels, an endless secondary chain passing over said two pairs of toothed wheels, and teeth carried by said secondary chain and meshing with the links of said scraper chain.
Claim 6
Dependent Claim
45 words
Gantry scraper conveyor as set forth in claim 1, wherein said secondary driving means meshing with said scraper chain comprise a pair of driving sprockets rotatably mounted on said movable carriage and meshing with the two runs of the scraper chain of the secondary arm.
Claim 7
Dependent Claim
64 words
Gantry scraper conveyor as set forth in claim 5, comprising rollers rotatably mounted at spaced intervals on the pins of the scraper chain links, and teeth disposed likewise at spaced intervals on the outer periphery of each sprocket with a pitch corresponding to the pitch of said rollers, so that said rollers mesh with said teeth for regularly and constantly driving said scraper chain.
Claim 8
Dependent Claim
35 words
Gantry scraper conveyor as set forth in claim 6, comprising notches or cavities formed between said sprocket teeth and having a radius of curvature corresponding to that of the rollers carried by the scraper chain.
Claim 9
Dependent Claim
76 words
A gantry scraper comprising two different operating arms consisting of a primary arm and a secondary arm operable to a position resting upon the two opposite slopes of a heap of material to be stored or picked up, a single continuous scraper chain provided with scraper tongue elements travelling along said primary and secondary arms, and traction compensating means carried by said secondary arm and acting on the upper and lower runs of said scraper chain.
Claim 10
Dependent Claim
76 words
A gantry scraper comprising two different operating arms consisting of a primary arm and a secondary arm operable to a position resting upon the two opposite slopes of a heap of material to be stored or picked up, a single continuous scraper chain provided with scraper tongue elements travelling along said primary and secondary arms, and traction compensating means carried by said secondary arm and acting on the upper and lower runs of said scraper chain.
Claim 11
Dependent Claim
51 words
A gantry scraper according to claim 8, wherein said traction compensating means comprises a carriage means mounted for longitudinal movement on said secondary arm, said carriage means being operable to cancel the effort due to the upward movement of the chain along said secondary arm while maintaining said chain properly tensioned.
References Cited (Backward Citations)
US296509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |