Reciprocating tool
AssigneeMakita Corporation
InventorsYudai SUGINO, Tomohiro UKAI
Life of this patent
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Abstract
A reciprocating tool includes a motor, a crank, a connecting rod, a rod, a tool bit, and a counter weight. The tool bit is mounted such that the action portion is positioned on a side opposite to a side with the rod central axis or the extended line of the rod central axis viewing from the rotational center of the crank. The first eccentric shaft and the second eccentric shaft are disposed such that at a position where the first eccentric shaft causes the rod to reach TDC, the second eccentric shaft causes the counter weight to reach BDC or a point before the BDC, and at a position where the first eccentric shaft causes the rod to reach the BDC, the second eccentric shaft causes the counter weight to reach a point before the TDC.
Claims7
A reciprocating tool comprising,
- a motor;
- a crank rotated by the motor;
- a connecting rod coupled to a first eccentric shaft of the crank;
- a rod coupled to the connecting rod;
- a tool bit with an action portion, the tool bit being mounted on the rod, and the action portion acting on a workpiece;
- and
- a counter weight coupled to a second eccentric shaft of the crank, wherein
- the crank has a rotational center which is not disposed on an extended line of a central axis of the rod,
- the tool bit is mounted such that the action portion is positioned on a side opposite to a side on which the rod is coupled to the connecting rod, and
- the first eccentric shaft and the second eccentric shaft are disposed such that,
- at a position where the first eccentric shaft causes the rod to reach TDC, the second eccentric shaft causes the counter weight to reach BDC or a point before the BDC, and
- at a position where the first eccentric shaft causes the rod to reach the BDC, the second eccentric shall causes the counter weight to reach a point before the TDC.
Dependencies are inferred from the claim text.