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:
Aug. 29, 1995
Filed:
Oct. 22, 1992
Tadashi Mukunoki, Toyonaka, JP;
Kabushiki Kaisha Sakura Kurepasu, Osaka, JP;
Abstract
First and second engaging projected portions are formed on opposing circumferential surfaces of a tubular casing and a hollow lead portion which are rotated relative to each other so as to be coupled with, thereby spirally engaging external and internal threads formed on the respective opposing circumferential surfaces. A forward side face of the first engaging projected portion with respect to a spiral rotating direction is formed into a slanting face so as to allow the second engaging projected portion to move over the first engaging projected portion when the casing and the lead portion are completely coupled with each other. Further, backward side faces of the first and second engaging projected portions are formed into upright faces, such that the second engaging projected portion cannot move over the first engaging projected portion in an opposite direction once moving over the same. This arrangement reliably prevents the spiral engagement of the casing and the lead portion from loosening.