DEVICE FOR AUTOMATIC VENTILATION OF GREENHOUSES Russian patent published in 1995 - IPC

FIELD: ventilation of greenhouses. SUBSTANCE: device for automatic ventilation of greenhouses improves the temperature conditions in greenhouse by decreasing the device sluggishness and increasing the temperature stability at door opening and closing. The device uses temperature-sensitive element 2, rigidly secured on frame 1, weight 3 on flexible link 4 and leverage 5 for opening of door 6. The movable end of the temperature-sensitive element is rigidly linked with plate 7 that is engageable in turn by its projections 8 and 9 with boss 10 on drum 11 for flexible link 4. Drum 11 is tightly fitted on axle 12 connected with leverage 5 through crank 13. EFFECT: facilitated procedure. 2 dwg