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. 01, 1995
Filed:
Jan. 19, 1994
Alan R Sternquist, Pleasanton, CA (US);
Newell Operating Company, Freeport, IL (US);
Abstract
The present invention provides a roller shade with a variable load brake and, in a modification thereof with a lift assist. The load brake includes a compressible spring surrounding a threaded rod, the spring acting against a traveling nut mounted on the rod. The compressive friction of the traveling nut against the threads of the threaded rod continually varies during raising and lowering of the shade to provide the variable load braking capability. The lift assist uses at least one torsion spring, also associated with a shaft and coupled between a nonrotating flange and a nipple rotationally anchored to the shaft. The torsion spring system is increasingly loaded when the shade is lowered.