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:
Apr. 07, 1987
Filed:
Apr. 11, 1986
Applicant:
Inventor:
Robert S Flight, Rochester, NY (US);
Assignee:
Caldwell Manufacturing Company, Rochester, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E05F / ;
U.S. Cl.
CPC ...
16199 ; 254391 ; 16DI / ;
Abstract
A block and tackle window sash balance system 10 has its friction made adjustable by a friction spring 20 and a cam 30 arranged for pressing spring 20 against a radial face of a pulley 15 in a high friction position and moving the spring clear of the pulley in a low friction position. Cam 30 is preferably accessible with a screwdriver for adjusting friction after the balance is installed in a window.