| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that in a stretchable screw made from a resin in a conventional zoom auger, each screw unit tip portion first rushed in grains is largely worn with rotation on the conveyance of the grains to deteriorate the conveying function and further damage the conveyed grains due to the worn sharpened screw unit tip portion. SOLUTION: The invention relates to the stretchable screw 5 of the zoom auger 3 disposed on the grain tank 2 of a combine harvester 1. Screw units 5a, 5b, 5c molded from a resin as a raw material are stretchably connected to each other. The thick layer A of the tip portion 6 first rushed in grains with the rotation of the screw in each screw unit 5a, 5b or 5c is formed in a larger thickness than that of the thick layer B of the following screw portion 7. COPYRIGHT: (C)2004,JPO
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