TEMPERATURE CONTROL DEVICE FOR GREENHOUSE Russian patent published in 1994 - IPC

FIELD: agriculture. SUBSTANCE: device has door 16 which can be turned relative to greenhouse framework. Drive of door is made in form of hydraulic cylinder 1 with cover 2 and plunger 3. Hydraulic cylinder 1 is connected by rod 15 with door 16 through door hinge. Device has housing 8 for lubricating liquid 9 which embraces hydraulic cylinder 1 and is provided with widening in zone of location of cover 2 and elastic cup 5 with lubricating liquid 6 embracing plunger 3. Cup 5 is connected to cover 2 by its open side. Spring 14 is placed in clearance between housing 8 and hydraulic cylinder 1. Plunger 3 is installed for movement along axial hole made in cover 2. Made in housing 8 at side of cover 2 is axial hole 10. Projecting part 11 of cover 2 is installed for movement along hole 10 at one side and adjusting screw 12 is fitted at other side. Device has also valve 28 installed on top of cover 2 which has holes 27. Outer diameter of cover 2 does not exceed inner diameter of narrowed part of housing 8. EFFECT: reduced overall dimensions of device and metal usage. 2 cl, 2 dwg