Title:
緩み止め座金装置
Document Type and Number:
Japanese Patent JP4512879
Kind Code:
B2
Abstract:
A washer device for preventing looseness reduced in thickness, simplified in part configuration to lower cost, and capable of automatically compensating for looseness of a connection part, formed of a bolt and nut, due to aging, such as shrinkage of a connected member, so as to continuously and reliably preventing the looseness of the connection part. The washer device is for preventing looseness and includes a pair of washers, wherein at least one of the washers is a dome washer having a bolt insert hole. A circular elastic body having a power spring wound around the periphery is disposed in a gap between a spherical surface of the dome washer and an opposing surface, wherein the gap gradually narrows from the periphery toward the center. The power spring having an expanded diameter due to an expansion force caused by tightening is wound around in the gap like a snake by a restoring force. In this way, looseness of a screw due to shrinkage of the connected member is prevented by using the power spring as a wedge for maintaining the separation between the washers.
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Inventors:
Takao Tsukui
Application Number:
JP2005504747A
Publication Date:
July 28, 2010
Filing Date:
January 29, 2004
Export Citation:
Assignee:
Takao Tsukui
International Classes:
F16B39/24; F16B41/00; F16B43/00
Domestic Patent References:
| JP2001280328A | 2001-10-10 | |||
| JPS6145612U | 1986-03-26 | |||
| JPS61173838U | 1986-10-29 | |||
| JPH0558933U | 1993-08-03 |