Gear Motor: Small Motor on a Three-Shaft Box of Floating Gears (Swenson 1959)

A small motor with a reduction gearbox bolted on. Swenson's box has only three shafts: the motor shaft with its pinion, a fixed stub shaft, and the output shaft. The gears ride free on the two shafts in pairs and pass the drive back and forth between them, slower at each step. Only the last gear is fixed to the output shaft. Source: Thure R. Swenson, US 2,908,180 (1959). Unknown: the motor, the fibre gear material, the thrust bearing, the metals, and every size and ratio. Swenson gives none of these, so they are linked to unknown heads. The machining is ours. Picture: the patent's drawing.