Patent ID: 9700949
Date: 2017-07-11
CPC Classifications: B23D

Claim:
1. A reciprocating drive mechanism for a power tool, comprising: a rotatably mounted transmission shaft having a first central axis; a spindle comprising a spindle body having a second central axis parallel with the first central axis; a counterweight configured for linearly reciprocating motion guided by at least one guiding rod, the counterweight having a counterweight body; and a wobble plate mounted on the transmission shaft and comprising a first arm and a second arm, wherein a length of the first arm and a length of the second arm extend along an arm axis, wherein the length of the first arm and the length of the second arm extend lengthwise in opposite directions, relative to the transmission shaft, along the arm axis, wherein the first arm is configured to cooperate with the spindle and the second arm is configured to cooperate with the counterweight so that, upon rotation of the transmission shaft, the first arm drives the spindle and the second arm drives the counterweight such that the spindle and the counterweight reciprocate in opposite directions parallel to the second central axis, and wherein the arm axis intersects a plane that is defined by the first central axis and the second central axis.