Title:
WASHER FOR PREVENTING BREAKDOWN OF SCREW
Document Type and Number:
Japanese Patent JP2002122121
Kind Code:
A
Abstract:
To provide a washer to be used for a valve element fitting part of a fire hydrant and capable of preventing a breakdown of a screw.
Outline of a washer 1 is formed into a normal flat washer having a screw hole 2 at a central part thereof. Both of a surface and a back surface of the washer 1 as contact surfaces are formed with mesh-like fine saw teeth over the whole surface thereof so as to perform the friction increasing work 3.
Inventors:
HIROTA MOTOAKI
Application Number:
JP2000314984A
Publication Date:
April 26, 2002
Filing Date:
October 16, 2000
Export Citation:
Assignee:
SHIMIZU GOKIN SEISAKUSHO KK
International Classes:
F16B43/00; (IPC1-7): F16B43/00
Attorney, Agent or Firm:
Akihiro Takeda