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. 31, 1989
Filed:
Aug. 14, 1987
Norman R Westfall, Rochester, NY (US);
Patrick E Milligan, Kendall, NY (US);
John I Habbersett, Rochester, NY (US);
Brian S Dense, Rochester, NY (US);
Caldwell Manufacturing Company, Rochester, NY (US);
Abstract
A block and tackle balance system (10), contained within a spring cover (12) extending for the full length of a jamb liner (11), includes a guide (30) that directs a cord (25) through an angled course as it passes from the balance (20), through a hole (13) in the spring cover, to a support that moves up and down with a sash (15) outside the spring cover. The passing of the cord through the angled course in the guide produces load-related friction that helps prevent hop and drop of the sash. Guide (30) also preferably supports an end of the balance within the spring cover, and a support (50, 60) on the free end of cord (25) preferably engages sash (15) automatically as the sash assembled between a pair of jamb liners (11).