Material or article handling – Marine loading or unloading system – Marine vessel to/from shore
Patent
1989-06-07
1991-01-29
Spar, Robert J.
Material or article handling
Marine loading or unloading system
Marine vessel to/from shore
198509, 198709, 198710, 4141425, B65G 1736
Patent
active
049882503
ABSTRACT:
A bucket elevator type continuous ship unloader is used for both a sidewise shovelling operation and a catenary cleaning up operation. In this ship unloader, a bucket chain is wound around sprockets respectively provided at the front and rear ends of a horizontal frame and a sprocket provided above the rear sprocket such that it encircles the sprockets in an L-shaped form. The bucket chain is made loosened or taut by the upward or downward movement of the horizontal frame with respect to the upper sprocket. The horizontal frame is provided with a horizontal rail with which a roller provided on each bucket is fitted when the bucket chain is stretched tautly. During the sidewise shovelling operation, the buckets run while being guided by the rail. In consequence, the force acting on the bucket during the shovelling in the vertical direction as well as in a direction transverse to the direction of movement of the bucket is exerted on the rail. So, a bucket chain which is only strong enough to pull the buckets is required. This means that a bucket chain which is so rigid as required in the prior art is not necessary, and the weight of the bucket chain can be reduced.
REFERENCES:
patent: 2897769 (1959-08-01), Bishop et al.
patent: 4830177 (1989-05-01), Baba et al.
patent: 4838410 (1989-06-01), Gough
patent: 4860884 (1989-08-01), Kostrewa
patent: 4890719 (1990-01-01), Yagi et al.
patent: 4917234 (1990-04-01), Seymour
Hienz William M.
Spar Robert J.
Sumitomo Heavy Industrie's, Ltd.
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