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:
Jan. 19, 1999
Filed:
Nov. 24, 1997
Syunji Nishimura, Ohmiya, JP;
Fuji Photo Optical Co., Ltd., , JP;
Abstract
A helicoid structure is disclosed that includes a male helicoid provided on an inner barrel and a female helicoid provided on an outer barrel. The female helicoid includes long female crests having engagement ends positioned near a forward end of the outer barrel and short female crests having engagement ends positioned further from the forward end of the outer barrel. At least one of the short female crests is connected to an adjacent long female crest by a guiding crest respectively formed along a plane extending orthogonally to an axis of the outer barrel. When the inner barrel having the male helicoid is rotated relative to the outer barrel having the female helicoid in order to assemble the inner barrel into the outer barrel, the engagement ends of the male helicoid crests are guided by the guiding crests so that the inner barrel may be rotated without any linear movement relative to the outer barrel.