Title:
SCREW DRIVING METHOD AND SCREW DRIVING DEVICE
Document Type and Number:
WIPO Patent Application WO/1997/028927
Kind Code:
A1
Abstract:
When a screw (14) is driven into materials (61, 62), into which the screw is driven, reaction of a driver bit (11) in a direction of rising is lessened to enable high-speed and secure screwing. In a screw driving method, a large pressing force of about 7 to 10 kg is employed to disengage the screw (14) from a connecting band (13) and drive the same into the materials until it reaches a predetermined depth (underside of the material 61), and a small pressing force of about 2 to 3 kg is employed to drive the screw (14) into the material (62) while rotating the same. In a screw driving device (1), a tip end of a driver bit (11) is fitted into a groove on a head of the screw (14), and the driver bit (11) is advanced to thereby disengage the fitted screw (14) from the connecting band (13). While a tip end of the screw is further driven a predetermined depth into the material (61), a main piston (26) advances the driver bit (11) with a great pressing force to drive the screw (14) a predetermined depth into the material (61). Thereafter, in order to drive the screw into the material (62), a sub-piston (27) extending centrally through the main piston (26) advances the driver bit (11) with a small pressing force. The driver bit (11) is rotated by an air motor (31).
Inventors:
ARATA KEN (JP)
FUJII SATOSHI (JP)
FUJII SATOSHI (JP)
Application Number:
PCT/JP1997/000324
Publication Date:
August 14, 1997
Filing Date:
February 07, 1997
Export Citation:
Assignee:
KANEMATSU NNK CORP (JP)
ARATA KEN (JP)
FUJII SATOSHI (JP)
ARATA KEN (JP)
FUJII SATOSHI (JP)
International Classes:
B25B21/00; B25B21/02; B25B23/04; B25C7/00; (IPC1-7): B25B21/00
Foreign References:
| JPS61257784A | 1986-11-15 | |||
| JPS6445581A | 1989-02-20 | |||
| JPH06315870A | 1994-11-15 |
Other References:
See also references of EP 0820839A4
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