Handheld power tool e.g. saw, has eccenter assemblies fixed to rotary drive shaft and translating rotary movement of shaft into reciprocating linear movement of tool holder and counterweight, respectively

摘要

The tool has an eccenter assembly fixed to a rotary drive shaft (8) and translating rotary movement of the shaft into reciprocating linear movement of a tool holder (9). Another eccenter assembly translates movement of the shaft into reciprocating linear movement of a counterweight (6) diametrically opposite to and in phase with the movement of the holder. Each of the assemblies has a circular part (1a, 1a`) eccentric to the shaft, and a member (2) adjustable and lockable relative to the part. The member has an off-center crank pin imparting reciprocating linear movement as the shaft rotates.