Patent ID: 8915406

Claim:
A dosing unit for a powder dispenser comprising: a first dosing chamber and a second dosing chamber that are two half-pipes formed by division of a tube by a vertical plate, each chamber comprising: one upstream inlet and one downstream outlet; an upstream blade fixed on a first shaft, the upstream blade having a shape that is complementary to at least a portion of the inlet for opening and closing the inlet; a downstream blade fixed on a second shaft, the downstream blade having a shape that is complementary to at least a portion of the outlet for opening and closing the outlet, wherein the shafts of the upstream blades and the downstream blades are connected through notched gears; and a ball held between a spring and a disc surface of one of the notched gears, the upstream blade closing the inlet when the downstream blade opens the outlet, and the upstream blade opening the inlet when the downstream blade closes the outlet, wherein the upstream blade of the first dosing chamber closes the first dosing chamber inlet when the upstream blade of the second dosing chamber opens the second chamber inlet, and the upstream blade of the first dosing chamber opens the first chamber inlet when the upstream blade of the second dosing chamber closes the second chamber inlet, and wherein the upstream blades are driven by the same shaft, and wherein the downstream blades are driven by the same shaft.