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:
May. 15, 2001
Filed:
Mar. 30, 1999
Applicant:
Inventors:
Noriaki Tokuyama, Tokyo, JP;
Yoshihiro Otsuka, Tokyo, JP;
Assignee:
Sanwa Shutter Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
A47G 5/02 ;
U.S. Cl.
CPC ...
A47G 5/02 ;
Abstract
An electrically-driven closure apparatus for building includes a shutter curtain, a driving device for driving the shutter curtain to open and close an opening, a load detecting spring disposed between the driving device and a fixed member or the frame, and sensors for detecting the rotation of the driving device. The driving device is supported rotatably around the axis of the extending shaft in accordance with load variation. The load detecting spring is slidably fixed by a spring fixing member. Thus, the spring fixing member can be used also as an adjustment member for adjusting the spring constant.