Spring system for double-hung window sash
US4685175A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1985 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Aug 30, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/148
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A window spring system for jamb liners 10 having a guide rails 11 formed in sash run regions 12 includes a spring 40, spring cover 60, spring anchorage 30, and sash platform 50 assembled within spring cover 60 that encloses spring 40 and has a closed back side 61 formed with opposite guide edges 62 shaped to slide into an interlock with guide rails 11 in jamb liner 10. An upper region 66 of the back side of spring cover 60 is cut away to receive spring anchorage 30, which is connected to an upper region of spring 40 and engages spring cover 60 and jamb liner 10 and preferably interlocks with jamb liner guide rails 11. A lower region 67 of the back side of spring cover 60 is cut away to receive sash platform 50 connected to a lower region of spring 40 and also preferably interlocking with guide rails 11 of jamb liner 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.