Title:
SCREW AND WRENCH FOR SNUGLY-FITTED TIGHTENING
Document Type and Number:
Japanese Patent JP2958858
Kind Code:
B2
Abstract:
PURPOSE: To provide a screw for snugly-fitted tightening pairs of high efficiency, having a lobate head or a lobate-socket head.
CONSTITUTION: Each lobe 37 is formed by one face 37' directed in a substantially circumferential manner and two other substantially parallel faces 35, 36 directed inwardly of a screw, and the screw is provided with a reaction surface 33 with a tightening wrench 32. The portions of the reaction surface included between two adjacent lobes are comprised each of a pair of faces 38, 39 inclined to each other to form an angle concave towards the outside of the screw so as to constitute a reaction surface with a wrench of a polygonal profile.
Inventors:
JANNANTONIO BURUGORA
Application Number:
JP6852495A
Publication Date:
October 06, 1999
Filing Date:
February 17, 1995
Export Citation:
Assignee:
EI ESU TETSUKU ASHISUTENZA TEKUNIKA SRL
International Classes:
F16B23/00; B25B13/04; F16B35/06; (IPC1-7): F16B23/00
Domestic Patent References:
| JP5118313A | ||||
| JP5036952U | ||||
| JP5079863U | ||||
| JP56108014U |
Attorney, Agent or Firm:
Hidemori Saito (2 outside)
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