Wedge-type tensioning rail construction for electrically heated screens
US4148724A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Dec 13, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B1/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A rail construction for mounting and tensioning an electrically heated screen on and between a pair of longitudinally extending, spaced frame members. The rail preferably is formed as an aluminum extrusion having a relatively large metal mass in cross section. The rail has a modified channel shape in cross section with an upper curved flange, a lower angled flange and an intervening projection. The upper curved flange is enclosed with electrical insulation and is adapted to engage a vertical wall of one of the frame members when mounted thereon. The lower angled flange has a hook shape complementary to a hook shape formed on the edge of the screen cloth. The intervening projection forms a wedge-shaped channel in combination with the lower hook-shaped flange of the rail. The wedge-shaped channel has an angled surface against which a complementary wedge-shaped clamping bar clamps the hooked screen edge. A series of bolts extending through the rail from the outside surface clamp the wedge bar, and interposed hooked screen edge, against the angled surface of the wedge-shapedchannel. A plurality of bolts extend through the rail and are engageable wih a vertical wall of the frame member …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.