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US 6,672,404 B2Granted
Screw fastening machine
AssigneeHitachi Koki Co., Ltd.
InventorsTakeshi Kamo, Yasuo Sasaki, Michio Wakabayashi
Life of this patent
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Abstract
Two guide members cooperatively constitute a chuck portion for holding a screw head. Opening and closing of the chuck portion is regulated depending on a mutual position between a machine body and a member into which a screw is driven. Guide pin portions of respective guide members engage with a stopper portion of a push lever until a screw is driven to a predetermined depth. The chuck potion tightly holds the screw head until a screw fastening operation is substantially finished, thereby suppressing the lifting of a machine body.
Claims5
A screw fastening machine comprising:
- a driver bit driven by an air motor and an air piston so as to reciprocate in an axial direction and rotate about its axis;
- a screw feeding portion for feeding screws one by one to a predetermined portion beneath said driver bit;
- a nose portion for guiding a screw when said screw is pushed out by said driver bit;
- and
- a vertical guide attached to a front end of said nose portion for holding said screw guided by said nose,
- wherein said vertical guide has a chuck portion for holding a screw head, and
- opening and closing of said chuck portion is regulated depending on a mutual position between a machine body and a member into which the screw is driven.
4 more elements
Dependencies are inferred from the claim text.