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Title:
SCREW DRIVING CONSTRUCTION
Document Type and Number:
Japanese Patent JP3545771
Kind Code:
B2
Abstract:

PURPOSE: To guarantee exact guidance of a screw driving tool tip and transmis sion of a large torque, by forming a recess with walls having conical surfaces at the side wall radially displaced from the cylinder surface toward inside or outside at the end of a screw to accept the screw driving tool tip.
CONSTITUTION: A recess 2 is formed at the end 1 of a screw to accept a screw driving tool, the side wall 3 of the recess 2 is formed by six arcs 4, the outline of which outwardly turns, and the arcs 4 are mutually connected with inwardly turning arcs 5. Further, a part of the inwardly turning arcs 5 of the side wall 3 is formed into conical surfaces 6. The screw driving tool is provided with a protrusion with a side wall 16, which is formed by outwardly turning arcs 17 and inwardly turning arcs 18 with twice the radius of the arcs 17 arranged between the arcs 17. The radially inside walls are formed into conical surfaces 19, and the free edge 20 of the protrusion 15 is formed into a conical surface.


Inventors:
Armin Schuster
Application Number:
JP19421192A
Publication Date:
July 21, 2004
Filing Date:
July 21, 1992
Export Citation:
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Assignee:
Adolf Würth Gesellschaft Mitt Beschlenktel Haftung und Companie Commande Geselsyaft
International Classes:
F16B23/00; B25B13/06; B25B15/00; (IPC1-7): F16B23/00; B25B15/00
Domestic Patent References:
JP4191513A
JP48012505B1
JP55150975A
JP55132409A
Foreign References:
US3584667
GB2153033A
US2173707
Attorney, Agent or Firm:
Mitsufumi Esaki
Tsuneo Mihara
Masuo Hagiwara