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. 21, 1987
Filed:
May. 12, 1986
Daijiro Nakamura, Ono, JP;
SM Industrial Co., Ltd, Osaka, JP;
Abstract
An improved take-up mechanism for a roll-up type screen, wherein the screen is pulled out to a desired length, and then by simple pulling and releasing, rolled up on the shaft. The shaft is automatically locked at the desired length of screen by engagement of a lock roller projected by a cam magnet. During pulling out operation, a magnet, a covering yoke and a cylinder disposed therebetween do not move with respect to each other, whereas during roll up operation under force of the wound up spring, the cylinder rotates under control of the magnetic field between the yoke and magnet to control the speed of roll up. The improvement comprises lock rollers on a cam magnet, one way clutches, roll holder, and ring lock for the rollers, together with the magnet to produce the above effects.