Portable protective structure which avoids roof sag and pocketing
US5224507A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 1990 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Jul 10, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S135/907
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The structure is adapted for frequent set-up and takedown and is designed to avoid roof sag and pocketing. The structure includes a framework having plural vertical supports and plural horizontal supports bridging between adjacent vertical supports. A removable roof cover is dimensioned to extend over and removably attached to the structural framework, and defines plural corners, with each corner positioned at an intersection of a horizontal support and a vertical support so as to define an intermediate roof field between adjacent corners. The vertical supports include elevated curves for lifting the corners of the roof cover, so as to form the intermediate field in a trough, the peripheral hem of the roof cover being removably attached to the vertical supports to draw the roof cover taut across the intermediate field and thereby avoid roof sag and pocketing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.