Conveyors: power-driven – Conveyor section – Spiral
Patent
1989-01-11
1990-02-13
Spar, Robert J.
Conveyors: power-driven
Conveyor section
Spiral
198833, B65G 1302
Patent
active
048998710
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a storing installation which comprises two endless chains supporting a load for the conveyance thereof along a conveyance path and travelling in opposition to said conveyance path in a return path having more tightly curved portions than said conveyance path, to form closed chain paths, and a frame for supporting said chains via at least one series of rolling elements arranged between said frame and the respective chain.
The storing installation is intended primarily for an endless conveyor belt travelling helically in a number of turns laid upon one another in a pile, the chains of said storing installation being arranged underneath the belt pile, supporting both edge portions of the lowermost belt turn, and travelling in opposition to the rise of the conveyor belt in the return path which is tighter than the conveyor belt path in the pile.
A conveyor belt of this type is shown in, for example, SE-C-7303179-1 and SE-C-8206759-6 in which, more particularly, the individual belt turns of the pile are supported, each by its underlying turn, by means of spacing members mounted at the belt edges.
Thus, SE-C-8206759-6 discloses a storing installation for a conveyor belt of the above-mentioned construction, said installation being of the type mentioned by way of introduction and comprising two chains which are arranged underneath the belt pile and support both belt edge portions throughout at least one complete turn, said chains being carried in a frame. This means that the chains will follow the lowermost belt turn in its rise and then travel in opposition to the conveyor belt rise in a return path which is tighter than the path of the conveyor belt, to form closed chain paths. Between each chain and the frame carrying the chain, there are arranged two series of balls to facilitate the chain movement. The series of balls do not follow the chain in its return path, but are conducted through separate channels to a point in the chain path immediately ahead of the location where the chain begins to support the conveyor belt.
In refrigerating plants, however, such a separate channel for the balls involves the risk that ice may form at the junctions with the chain path and thus obstruct the ball movement. Such obstacles are not readily removed by the pressure exerted by the balls.
The primary object of the present invention is to provide a storing installation of the type mentioned by way of introduction and adapted to eliminate the said risk of ice formation. A further object is to provide a storing installation in which the rolling elements are positively driven throughout the chain path, and also a storing installation which requires but one series of rolling elements for each chain. The said primary object is achieved in that each chain comprises links overlapping one another along the upper side and one edge side of the chain and hingedly interconnected at the other edge side of the chain along axes perpendicular to the longitudinal direction and the lateral direction of the chain, such that the chain and the frame form an essentially closed channel for the rolling elements also throughout the tighter return path where the links are swung out from one another about said axes.
The axes interconnecting the chain links thus are essentially parallel to the vertical direction of the pile. Furthermore, the adjoining links of at least one chain are preferably spaced apart a distance such that the chain is laterally flexible in both directions.
Instead of a second series of rolling elements, use may well be made of slide rails mounted on the frame for sliding contact with chain rails on each chain. In this instance, link rollers may be rotatably mounted about the link connecting pins for rolling contact with the respective slide rail. To drive at least one chain, and thus the conveyor belt, a motor may be provided at the beginning of the return path, said motor being coupled with a toothed wheel engaging with the link rollers of said chain.
More particularly, the link rollers are position
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Frigoscandia Contracting AB
Gastineau Cheryl L.
Spar Robert J.
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