The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2000
Filed:
Sep. 17, 1999
Mitsuo Sato, Kanagawa, JP;
Hideo Itakura, Kanagawa, JP;
Aida Engineering Co., Ltd., , JP;
Abstract
A corresponding pair of male and female screw members includes alternately disposed rising and falling sloped surfaces on threads of the male and female screw members along a sliding direction of the threads. Depressions and projections are disposed continuously in a direction perpendicular to the sliding direction. One of the depressions or one of the projections resides between each adjacent pair of the sloped surfaces. A lubricating oil is placed between the threads of the male and female screw parts. An incline angle of the sloped surfaces is selected appropriately to increase a wedging action of the sloped surfaces against the lubricating oil film which occurs when the male screw member is rotated with respect to the female screw member.