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. 11, 2000
Filed:
Jan. 04, 1999
Wei-Cheng Wang, Tai Nan Hsien, TW;
Chen-Chin Cheng, Hsin Chu, TW;
Fu-Jen Hu Kao, Taipei, TW;
Ya-Wei Hsu, Hsin Chu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Nien Enterprise Co., Ltd., Chang Hua Hsien, TW;
Abstract
A Venetian blind is provided with a slat-lifting mechanism consisting of a slat set, a slat pull cord, and a constant torque pull set. The slat set has a plurality of slats. The slat pull cord is connected with each of the slats of the slat set and is put through the bottommost end of the slat set. The constant torque pull set is disposed at the top end of the slat set and composed of a pull cord member and a constant torque spring unit which is linked with the pull cord member and provided with a constant torque spring which has a constant retrieving force enabling the pull cord member to rewind. The constant retrieving force of the constant torque spring must meet the condition of W-Fs<R<W+Fs, in which W stands for a total weight of the slat set; Fs, a system static friction force; and R, a retrievable elastic force of the constant torque spring.