| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilation apparatus for a greenhouse without requiring any electric source with need of slight labor. SOLUTION: This ventilation apparatus belongs to a greenhouse 1 wherein a house body 3 having skeletons three-dimensionally constructed with a frame material 2 such as a pipe is formed by covering with a sheet 4 such as a vinyl resin, and the sheet at an arbitrary position of the greenhouse is wound by rotating a winding shaft 6 and an opening part through which the inside and outside of the house communication with each other is formable. In the apparatus, a supporting member 10 is stood at one end side of the winding shaft 6 and an elevator 11 going up and down with being supported by the supporting member, then the winding shaft 6 is rotatably supported with the elevator, thus a spiral spring to enforce the winding shaft to be rotated in forming the opening part is fitted and a lock member locking the spiral spring not usually to be enforced is attached. |
