Pulley for double hung windows
US6701670B2 · kind B2 · utility
3Cited by
21References
3Claims
0Family size
Inventor
Key dates
| Filing date | Aug 9, 2001 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Aug 9, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/148
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pulley apparatus (27) is disclosed which is adapted for use with a double hung wind. (10). The apparatus is used in pairs which are mounted in a recess (30) formed in the head (20) of the double hunt window. A pair of sash cords (25) are routed through the apparatuses and are attached to each sash so as to counterbalance one to the other, without the use of springs or extra weights.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.