| 摘要 |
PURPOSE: An automatic opening and closing device for a ventilation window with a chain inside is provided to be prevented from twisting, to improve support force, to prevent a chain wire from becoming reservedly bent. CONSTITUTION: An automatic opening and closing device for a ventilation window with a chain inside comprises a housing(10), a motor(20), a speed reducer(30), a gear-box(40), a chain case, a chain, and a power transmission shaft. The motor is installed inside the housing. The speed reducer connects to the drive shaft of the motor and reduces rotation speed. The gear-box is coupled with the speed reducer. The gear-box comprises a worm, a worm wheel, and a driven gear. The chain case is coupled with the gear-box. The chain case comprises a guide rail. The chain is accepted within the gear-box and the chain case. |
