| 摘要 |
PROBLEM TO BE SOLVED: To provide a crank type screwdriver capable of speedily fastening and loosening a screw by one hand. SOLUTION: This crank type screwdriver constitutes its characteristic feature of manufacturing a crank form made of a holding part 3 in rotating the screwdriver and input parts 4, 5 in strongly rotating the screwdriver on a shaft 1 of the screwdriver, fixing a handle 2 on a top part or providing it in a rotating type, holding the handle by hand, circularly moving the holding part when rotating the screwdriver by a finger tip and to strongly rotate the screwdriver by extending a finger to the input part when strongly rotating it.
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