| 摘要 |
PROBLEM TO BE SOLVED: To improve the operability of the ventilator for a vinyl house by permitting the sheets for ventilation to be opened and closed with a simplified mechanism and structure. SOLUTION: In this ventilator, the openings 2 formed on the side, roof and flank faces are opened or closed by winding up or down the sheet 3. The ventilation mechanism comprises the driving shaft that is fixed on the upper part and is freely rotatable, a fixer for fixing the sheet to the lower part, a sheet- winding shaft that is arranged between the driving shaft and the sheet fixer so that it may freely movable in the vertical direction, the belt 8 of which the top edge is fixed to the driving shaft and the bottom edge is fixed to the sheet-winding up shaft, the sheet of which the bottom edge is fixed to the sheet- fixer and the top edge is fixed to the sheet-winding up shaft, the power source that energizes the belt and the sheet to their rotation direction and the driving source that drives the driving shaft in the direction that the belt is wound up against the energizing power of the above driving source. |
