Cord guide system for sash balance
US4800680A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Aug 14, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/148
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.