Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1990-08-15
1991-10-29
Dayoan, D. Glenn
Conveyors: power-driven
Conveyor section
Endless conveyor
198847, B65G 1540
Patent
active
050607871
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveyor assembly and a conveyor belt therefor.
Belt conveyors are previously known which comprise an endless conveyor belt of elastic material, support rollers for supporting the belt along at least part of its path, and guide means for maintaining the desired shape of the belt.
SUMMARY OF THE INVENTION
A first object of the present invention is to provide a conveyor belt and thus a belt conveyor which allows closed conveyance of goods, in the first place in that the belt itself encloses the goods along the conveying run, and which can eliminate spilling along the return run, said conveyor belt and belt conveyor permitting belt paths with narrow curves in the horizontal and the vertical direction and, accordingly, horizontal, inclined and even vertical path sections, and further permitting charging and emptying at any location along the goods conveying run.
A second object of the present invention is to provide a conveyor belt, the design of which is simple and the manufacturing cost of which is relatively low, but which nevertheless withstands rough operating conditions and has a long life.
A third object of the present invention is to provide a belt conveyor which is compact and does not require complicated support, guide or drive rollers.
It will be appreciated that a belt conveyor by means of which the above objects are achieved, is a universally applicable belt conveyor which is environmentally acceptable and implies low manufacturing, operating and maintenance costs.
No prior art belt conveyor achieving the above objects is available.
Belt conveyors with closed conveyor belts allowing vertical conveyance of bulk material are disclosed in e.g. GB-A-571,210, DE-A1-1,431,684 and U.S. Pat. No. 4,230,221. The conveyors according to the two first-mentioned documents are unfavourable, inter alia since they require complicated connecting means for holding the edge parts of the belt together, and the belt conveyor according to the last-mentioned document, which uses two conveyor belts, requires additional equipment in the form of pneumatic boxes to keep the edge parts of the two belts together.
A belt conveyor for open conveyance of goods is disclosed in U.S. Pat. No. 2,998,121. Here, the belt travels in a fully planar state along the return run, and therefore the conveyor is bulky and cannot prevent spilling of goods along the return run. The conveyor is further only suited to convey light goods and cannot be used for conveyance in the vertical direction or along paths with narrow horizontal curves.
A belt conveyor similar to the last-mentioned one for closed conveyance is disclosed in U.S. Pat. No. 4,709,806. Flexible covering flaps are here used to close over the goods. Nor is this conveyor applicable for vertical conveyance and, conveying runs with narrow horizontal curves are not possible.
According to the present invention, the objects stated above are achieved by means of a conveyor belt of elastic material, which is characterised by a planar central part which is flexurally rigid about the longitudinal axis of the belt by means of a transverse reinforcement and has a low extensibility in the longitudinal direction by means of a longitudinal reinforcement; two edge parts which are each hingedly connected with a side edge of the central part and flexurally rigid about the longitudinal axis of the belt by means of a transverse reinforcement, said edge parts further being extensible in the longitudinal direction of the belt and having a total width which is at least equal to the width of the central part; and two hinge parts which each connect one edge part with the central part and are flexible about the longitudinal axis of the belt and extensible in the longitudinal direction of the belt, said hinge parts further being resilient for pivoting the edge parts out from a position folded towards wards the central part, and having a substantially smaller width than the central part.
According to the invention, the above objects are furt
REFERENCES:
patent: 2839180 (1958-06-01), Ackers
patent: 2998121 (1961-08-01), Gilbert
patent: 4230221 (1980-10-01), Beresinsky
patent: 4410082 (1983-10-01), McGinnis
patent: 4747344 (1988-05-01), Hashimoto et al.
patent: 4778046 (1988-10-01), Hashimoto et al.
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