Power tool with vibration reducing mechanism

A power tool, comprising:

• a motor configured to generate a rotational output,
• a crank pin eccentrically rotatable by the motor about a rotational axis,
• a non-rotatable first slider configured to be linearly reciprocated by the crank pin, the first slider being configured to linearly reciprocate a tool,
• a disk rotatably driven by the motor about the rotational axis,
• an eccentric pin coupled to the disk and disposed substantially diametrically opposite of the crank pin relative to the rotational axis, the eccentric pin being eccentrically rotatable about the rotational axis, and
• a non-rotatable second slider configured to be linearly reciprocated by the eccentric pin in a substantially opposite phase from the first slider, the second slider acting as a counterweight to the first slider to reduce vibrations at least in the direction of linear reciprocation,
• wherein the combination of the disk and eccentric pin have a center of gravity offset from the rotational axis towards the eccentric pin.

A power tool comprising:

• a motor generating a rotational output,
• means for converting the rotational output into a non-rotating linear reciprocating motion,
• a tool chuck configured to be linearly reciprocated by the converting means along its axial direction, and
• a non-rotatable counterweight configured to be linearly reciprocated by the converting means so as to offset vibrations generated at least in the direction of the linear reciprocating motion,
• wherein the converting means comprises a component that is rotatable about a rotational axis, the rotatable component having a center of gravity of all parts integrally rotating therewith that is offset from the rotational axis in a direction such that, when the center of gravity eccentrically revolves about the rotational axis, an axially-oriented component of the movement of the center of gravity in the direction of the linear reciprocating motion moves in unison with the linearly reciprocating counterweight and such that the combination of the linearly reciprocating counterweight and the axially-oriented component of the center of gravity at least substantially balance axially-acting inertial forces generated by the converting means in a substantially opposite phase.