US3762534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator-conveyor for bulk material
Assignee: MOLEDETH DEV CO Ltd
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Filing: 1971-07-15
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Granted: 1973-10-02
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Expires: 1991-07-15
Abstract
Abstract An elevator-conveyor for carrying bulk materials upwards or downwards over a path which extends at least in part vertically or at a slope between two different levels. The conveyor comprises two belts which are pressed against each other at their edges by pneumatic or hydraulic fluid pressure in such a manner that the material is fully enclosed. The pressure fluid acts either in two separate boxes along whose open sides the belts are tightly conducted, or in a single box through which both belts run in common.
Inventors
- 👤 I Beresinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
B; B65; B65G; B65G15/00; B65G15/10; B65G15/12; B65G15/18; B65G37/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
202 words
A conveyor for transporting bulk material, comprising: a. a pair of flexible fluid impermeable continuous belts each of which has a front surface and a rear surface; b. means mounting said belts so that the front surfaces of the belts face each other along a working stretch; c. drive means for moving said belts at the same speed; d. means for feeding bulk material between the front surfaces of said belts at a point before they enter said working stretch; e. pressure means to apply fluid under pressure directly to the back surface of at least one of the belts along said working stretch for urging the front surfaces of said belts toward each other; and f. the belts and the pressure means being constructed and arranged so that, along the working stretch, only the fluid pressure causes the middle portion of the front surface of each belt to be pressed into frictional engagement with said bulk material, and the opposite edge portions of the front surface of each belt on each side of the middle portion thereof to be pressed against each other into frictional gripping relationship whereby said bulk material is fully enclosed between said belts and is transported thereby.
Claim 2
Dependent Claim
202 words
A conveyor for transporting bulk material, comprising: a. a pair of flexible fluid impermeable continuous belts each of which has a front surface and a rear surface; b. means mounting said belts so that the front surfaces of the belts face each other along a working stretch; c. drive means for moving said belts at the same speed; d. means for feeding bulk material between the front surfaces of said belts at a point before they enter said working stretch; e. pressure means to apply fluid under pressure directly to the back surface of at least one of the belts along said working stretch for urging the front surfaces of said belts toward each other; and f. the belts and the pressure means being constructed and arranged so that, along the working stretch, only the fluid pressure causes the middle portion of the front surface of each belt to be pressed into frictional engagement with said bulk material, and the opposite edge portions of the front surface of each belt on each side of the middle portion thereof to be pressed against each other into frictional gripping relationship whereby said bulk material is fully enclosed between said belts and is transported thereby.
Claim 3
Dependent Claim
47 words
A conveyor according to claim 1 wherein said pressure means comprises a pneumatic box associated with one of said belts, said box extending the length of said working stretch and including seal means that engage the respective edges of said one belt on the back surface thereof.
Claim 4
Dependent Claim
25 words
A conveyor according to claim 1 wherein said pressure means is constructed and arranged to apply directly to the backs of both of said belts.
Claim 5
Dependent Claim
54 words
A conveyor according to claim 3 wherein said pressure means comprises a pair of pneumatic boxes respectively associated with said belts and extending substantially the length of said working stretch, each of said boxes including seal means engaged with opposite edges of the back surface of the belt with which the box is associated.
Claim 6
Dependent Claim
26 words
A conveyor according to claim 3 wherein said pressure means comprises a single pneumatic box establishing said working stretch and through which both said belts pass.
Claim 7
Dependent Claim
104 words
A conveyor according to claim 5 including a guide pulley at each end of said box, one guide pulley being engaged with the back surface of one of said belts and the other guide pulley being engaged with the back surface of the other of said belts, and including a pair of seal means at each end of said chamber, one of said seal means of each pair being resiliently engaged with a guide pulley and the other one of said seal means of each pair being engaged with the back surface of that belt which is not engaged with the last mentioned pulley.
Claim 8
Dependent Claim
50 words
A conveyor according to claim 1 including a guide pulley engaged with the back surface of one of said belts and having a central annular concavity for receiving the middle portion of said one belt, and said pulley having cylindrical edges for receiving the edge portions of said one belt.
Claim 9
Dependent Claim
25 words
A conveyor according to claim 1 including a guide pulley engaged with the back surface of one of said belts and having a cylindrical shape.
Claim 10
Dependent Claim
33 words
A conveyor accoRding to claim 8 wherein said guide pulley has a resilient portion at least on the central peripheral region thereof for effecting the seating of the central portion of the belt.
Claim 11
Dependent Claim
25 words
A conveyor according to claim 1 including discharge means associated with the belts and located at a point where the belts leave said working stretch.
Claim 12
Dependent Claim
51 words
A conveyor according to claim 10 wherein said working stretch extends between two different levels, and said means for feeding the bulk material to the conveyor are located substantially at the lower level of the conveyor, and the conveyor is designed to discharge the material substantially at the higher level thereof.
Claim 13
Dependent Claim
51 words
A conveyor according to claim 10 wherein said working stretch extends between two different levels, and said means for feeding the bulk material to the conveyor are located substantially at the higher level of the conveyor, and the conveyor is designed to discharge the material substantially at the lower level thereof.
Claim 14
Dependent Claim
13 words
A conveyor according to claim 10 wherein said working stretch is substantially vertical.
Claim 15
Dependent Claim
12 words
A conveyor according to claim 10 wherein said working stretch is inclined.
Claim 16
Dependent Claim
178 words
A conveyor for transporting bulk material, comprising: a. a pair of flexible continuous belts each of which has a front surface and a rear surface; b. means mounting said belts so that the front surfaces of the belts face each other along a working stretch; c. drive means for moving said belts at the same speed; d. means for feeding bulk material between the front surfaces of said belts at a point before they enter said working stretch; e. a single pneumatic box extending the length of the working stretch and through which the belts pass; f. means to apply fluid under pressure to the box for urging the front surfaces of the belts toward each other and causing the front surfaces of the middle portions of the belts to grip the bulk material and the opposite edge portions of the front surfaces of each belt on each side of the middle portion thereof to be pressed against each other into frictional gripping relationship whereby the bulk material is fully enclosed between the belts and is transported thereby.
Claim 17
Dependent Claim
178 words
A conveyor for transporting bulk material, comprising: a. a pair of flexible continuous belts each of which has a front surface and a rear surface; b. means mounting said belts so that the front surfaces of the belts face each other along a working stretch; c. drive means for moving said belts at the same speed; d. means for feeding bulk material between the front surfaces of said belts at a point before they enter said working stretch; e. a single pneumatic box extending the length of the working stretch and through which the belts pass; f. means to apply fluid under pressure to the box for urging the front surfaces of the belts toward each other and causing the front surfaces of the middle portions of the belts to grip the bulk material and the opposite edge portions of the front surfaces of each belt on each side of the middle portion thereof to be pressed against each other into frictional gripping relationship whereby the bulk material is fully enclosed between the belts and is transported thereby.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |