GREENHOUSE SCREENING SYSTEM WITH ADJUSTABLE STROKE Russian patent published in 2000 - IPC

FIELD: agriculture, in particular, greenhouse illumination controlling equipment. SUBSTANCE: screening system has rack reducers connected with screening bars carrying screening beams. Additional bars are arranged in parallel with main bars in outer flight and are not connected to rack reducers. Additional bars are extending through at least two flights and are mounted in guides for progressive motion. Carriers are fixed on previous flight screening beam above additional bars of previous flight, and thrust yokes are fixed on additional bars at both sides of carriers so that gap between them provides free displacement of carrier during motion of screening beam of previous flight. Free motion is set by sliding of thrust yokes on additional bars. Value of free motion pitch provides reduced screening stroke of outer flight of greenhouse. EFFECT: enhanced reliability in operation of screening system of greenhouse outer flight and reduced additional force required for counteracting abrasion force. 3 dwg