Venetian blind slat construction
US5176193A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Apr 9, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B9/384
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A venetian blind (10) includes a headrail (11), a series of horizontal slats (12), a bottom rail (18) and lift cords (14) to raise and lower the slats and bottom rail, the slats each including spaced marquise shape apertures (22), called rout holes, through which a lift cord (14) passes. The spaced elliptical apertures are of less width and less length than the conventional rout holes heretofore employed. A substantial reduction of visible light through the apertures is achieved in the slats-tilted-closed position by a reduction of about 73% in the light-passing open space between the lift cord and the rout hole edges. The smaller size of the rout holes increases the structural rigidity and integrity of the remaining slat portions next to the rout holes and reduces the visual defect of the larger holes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.