Title:
WASHER FOR SCREW, SCREW WITH WASHER AND DEVICE HAVING FASTENING STRUCTURE BY SCREW WITH WASHER
Document Type and Number:
Japanese Patent JP2015145709
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a washer for a screw allowing the washer to be integrated with a stepped screw with a simple structure while causing characteristics of a fastening structure using the stepped screw and the washer to be exhibited when two constituent members having linear expansion coefficients different from each other are coupled together by the stepped screw.SOLUTION: A washer for a screw 1 is provided with a hole 2 and has spring properties in an axial direction of a screw 7 inserted through the hole 2. The spring properties are imparted to the washer for the screw 1 by curving a plate-like body 9. The washer for the screw 1 includes: at least two curved protrusions 3a and 3b in a circumferential direction of the hole 2; and at least one projection 5 brought into contact with the screw 7 inserted through the hole 2 at positions of the curved protrusions 3a and 3b in an inner periphery of the hole 2.
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Inventors:
UKITA MAMORU
Application Number:
JP2014019155A
Publication Date:
August 13, 2015
Filing Date:
February 04, 2014
Export Citation:
Assignee:
SEIKO EPSON CORP
International Classes:
F16B39/24; B41J2/01; F16B35/00; F16B39/26; F16B43/00
Attorney, Agent or Firm:
Masahiko Ueyanagi
Kazuaki Watanabe
Kazuaki Watanabe