Abstract: A drive mechanism includes a housing, a stationary shaft, at least one acceleration gear assembly, a rotation plate, and at least two centrifugal blades. The acceleration gear assembly having a plurality of acceleration gears is disposed inside the housing and pivots on the stationary shaft, and skewed teeth of the housing engage with the acceleration gears to force the acceleration gears to rotate as the housing rotates. The rotation plate is disposed inside the housing and pivots on the stationary shaft, and is actuated by the acceleration gear assembly and has a first end surface, a second end surface, and a first annular surface connected with the first and the second end surfaces. The centrifugal blades are disposed on the second end surface, and one side of the centrifugal blades has a unidirectional rotatable element engaging with the skewed teeth when the rotation direction of the housing reverses.

Abstract: A decelerating device includes a fixed shaft, a tube, a transmission element and a driven element is provided. The tube is disposed around the fixed shaft and adapted to rotate about the fixed shaft. The transmission element has a fixed portion fixed at the fixed shaft and a planetary gear revolvably disposed at the fixed portion. The teeth of the tube are geared to the planetary gear. The driven element has a wheel, a sun gear fixed at the wheel and a plurality of balls. The sun gear and the wheel are revolvably disposed at the fixed shaft and in the tube. The planetary gear is adapted to drive the sun gear. The wheel has holes. Each of the holes extends from an outer surface of the wheel facing the tube to the interior of the wheel to form a cavity. The balls are disposed in the holes respectively.

Abstract: A drive mechanism includes a housing, a stationary shaft, at least one acceleration gear assembly, a rotation plate, and at least two centrifugal blades. The acceleration gear assembly having a plurality of acceleration gears is disposed inside the housing and pivots on the stationary shaft, and skewed teeth of the housing engage with the acceleration gears to force the acceleration gears to rotate as the housing rotates. The rotation plate is disposed inside the housing and pivots on the stationary shaft, and is actuated by the acceleration gear assembly and has a first end surface, a second end surface, and a first annular surface connected with the first and the second end surfaces. The centrifugal blades are disposed on the second end surface, and one side of the centrifugal blades has a unidirectional rotatable element engaging with the skewed teeth when the rotation direction of the housing reverses.

Abstract: A slide mechanism adapted to a projection screen apparatus includes a frame, a slider, a resilient device, and an engaging device. The frame includes a receiving portion and a latch disposed in the receiving portion. The slider is slidably disposed in the receiving portion and includes a body portion defining a receiving groove and a pull handle. The resilient device is disposed below the slider for exerting a resilient force on the slider to move the slider. The engaging device is pivotally disposed in the receiving groove of the slider and includes an engaging end portion and an exerting end portion. The engaging end portion is disposed in the receiving groove and is connected against the latch. When a force is exerted on the exerting end portion, the engaging device is correspondingly rotated, and the engaging end portion of the engaging device is disengaged from the latch of the frame.

Abstract: A decelerating device includes a fixed shaft, a tube, a transmission element and a driven element is provided. The tube is disposed around the fixed shaft and adapted to rotate about the fixed shaft. The transmission element has a fixed portion fixed at the fixed shaft and a planetary gear revolvably disposed at the fixed portion. The teeth of the tube are geared to the planetary gear. The driven element has a wheel, a sun gear fixed at the wheel and a plurality of balls. The sun gear and the wheel are revolvably disposed at the fixed shaft and in the tube. The planetary gear is adapted to drive the sun gear. The wheel has holes. Each of the holes extends from an outer surface of the wheel facing the tube to the interior of the wheel to form a cavity. The balls are disposed in the holes respectively.