Abstract: Complementary relatively stationary pulleys having axially oppositely stepped diameter portions form a variable speed drive between a motor coupled with one stepped pulley and a driven device coupled with the oppositely stepped pulley such as the spindle of a drill press on which the device is mounted. A transmission belt for the stepped pulleys is bodily shifted with an associated belt tensioning idler pulley, a belt shaper guide, and a compression belt former selectively to position the belt in alignment with chosen diameter portions of the two stepped pulleys to effect a desired speed change while the belt is in a deformed state out of contact with the stepped pulleys, following which the belt is retensioned to engage it with the chosen stepped portions of the complementary stepped pulleys.

Abstract: A hand guided power driven garden plow features a low profile double width tire to provide traction in sandy or soft terrain and a free-wheeling connection in the power drive chain to allow easy rolling of the plow without engine power. Another major feature is the provision of a solid steel sub-structure incorporated in the framework of the machine for greater weight and better balance and traction and for economy in commercial production of the machine. Another embodiment utilizes a dual traction wheel in lieu of the single double width tire or wheel.