Patent ID: 7562600

Claim:
A slat angle adjusting device comprising: a body composed of a base having a top and a positioning bar formed on the top; and a cover attached to the base; a pinion rotatably mounted inside the body and having a non-circular hole defined through the pinion; a drive axle rotatably mounted inside the body, engaging with the pinion and having an outer periphery and an engaging end provided with multiple teeth; a rotating rod rotatably attached to the body and having an inner end extending into the body and provided with multiple teeth engaging with the teeth on the engaging end of the drive axle, and an outer end extending out of the body; and a roller attached to the outer end of the rotating rod, wherein the drive axle has at least one helical tooth formed on the outer periphery and engaging with the pinion; each one of the at least one helical tooth is composed of multiple separate helical tooth elements, and each helical tooth element has a length shorter than half a circumference of the outer periphery of the drive rod; and a gap is defined between adjacent helical tooth elements and is arranged in a longitudinal line along the outer periphery of the drive rod.