Title:
SCREW
Document Type and Number:
Japanese Patent JP3545786
Kind Code:
B2
Abstract:
PURPOSE: To enable rupture of a screw head from a screw shaft by tightening force which exceeds a fixed torque of the screw head by forming a driver tightening hole which reaches from the head to the screw shaft.
CONSTITUTION: A cross driver tightening hole 3 is provided in a head 2 of a screw 1, and a tip of the hole 3 reaches a screw shaft 4. When unit parts are assembled or a device is assembled by using the screws 1, the screw head 2 is not ruptured if they are tightened with torque below a fixed value, and assembly work can be done in the same way as ordinary screws. Tightening torque can be adjusted by a torque adjusting type electric driver. In the case of disassembly, when the head 2 is tightened with torque above a predetermined value by a cross driver 6, the screw head 2 is broken off from the screw shaft 4 and ruptured, and a member B which is joined on a member A can be removed easily. As a consequence, it is possible to shorten disassembling work hours greatly.
Inventors:
Hideaki Matsui
Nobuaki Tomisho
Shigeru Yoshiki
Shigeru Watanabe
Shinichi Kawahara
Nobuaki Tomisho
Shigeru Yoshiki
Shigeru Watanabe
Shinichi Kawahara
Application Number:
JP23976493A
Publication Date:
July 21, 2004
Filing Date:
September 27, 1993
Export Citation:
Assignee:
株式会社リコー
International Classes:
F16B31/02; F16B35/00; (IPC1-7): F16B31/02; F16B35/00
Domestic Patent References:
| JP60008509U | ||||
| JP58028114U | ||||
| JP52160054U | ||||
| JP57038909U | ||||
| JP56059089A |
Attorney, Agent or Firm:
Fujita Akira
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