Patent ID: 7387150

Claim:
A shade roller capable of bearing a heavy load comprising a seat with a socket, a loop attached to the seat and comprised of a plate having a first flange with a smaller external diameter than that of the plate, a first tooth member and a first hole formed on a side of the plate opposite to the seat; a side cover mounted around the loop and having a chamber and an opening that sleeves over the first flange of the loop; a planet wheel connected to the loop, held inside the chamber in the side cover and having an aperture defined through the planet wheel, a first inner tooth-shaped hole defined a side facing the loop, and a second tooth member having a same center with the first inner tooth-shaped hole formed on a side opposite to the loop; a chain-retaining wheel connected to the planet wheel and having a bead channel defined around a periphery edge, an eccentric depression defined on a side facing the planet wheel, a round slot defined around the eccentric depression to sleeve onto the first flange of the loop, and a through slot and a fixing slot defined on a side opposite to the eccentric depression; a driving wheel connected to the planet wheel and the chain-retaining wheel and having a second hole, a second flange held inside the fixing slot in the chain-retaining wheel, a round cam held inside the through slot in the chain-retaining wheel and a second inner tooth-shaped hole defined in a side facing the planet wheel and partially engaging with the second tooth member in the planet wheel; a fixing block with an orifice attached to the driving wheel; a fixing pin extending through the plate, the side cover, the planet wheel, the chain retaining wheel, the driving wheel, and fastened on the fixing block; a supporter provided between the inner wall of the aperture of the planet wheel and the fixing pin; and a beaded chain connected to and held in the bead channel in the chain-retaining wheel.