Drive motor for hand tools has two cylinders to form a 180 degrees angle and a crankshaft with two lifting spigots offset at 180 degrees for an opposed cylinder engine.

摘要

A crankshaft (4) for a drive motor (3) has two crankshaft bearings (7,8) and two counterweights (5,6). An intermediate cheek plate (10) fits between lifting spigots (11,12) with its width corresponding to that of the counterweights. The distance (b) from center to center of two connecting rods (9) amounts to a third of the distance (a) from center to center of the crankshaft bearings.