| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw unit divided in a connectable manner and easily, positively and firmly connectable. SOLUTION: A core shaft and a spiral blade of the screw device are integrally formed, and the length of the core shaft and spiral blade is in a form of being divided into the length equivalent to at least the half pitch of the spiral blade. One end face of the core shaft 2 is provided with a connecting projecting part 4 of noncircular cross-sectional shape, and the other end face is provided with a connecting recessed part 5 into which the noncircular connecting projecting part 4 can be fitted, thus forming the screw unit 1. A plurality of screw units 1, 1 are connected through the fitting of the connecting projecting part 4 and connecting recessed part 5 of each core shaft to obtain the screw device 14 with a prescribed length. COPYRIGHT: (C)2003,JPO
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