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US 2019/0118365 A1Published application
Striking tool
AssigneeMakita Corporation
InventorKiyonobu YOSHIKANE
Life of this patent
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Abstract
Vibrations resulting from a reciprocating piston and vibrations resulting from a rotating crank shaft are reduced effectively. A housing for a hammer drill accommodates, at a position at which a cap closes a supply port, a counterweight movable in cooperation with a crank mechanism to reduce vibrations in a striking axis direction resulting from a reciprocating piston, and a second counterweight rotatable in cooperation with the crank mechanism to reduce vibrations in a rotational direction resulting from a crank shaft.
Claims20
A striking tool, comprising:
- a housing including a supply port;
- a striking mechanism placeable in the housing, the striking mechanism including
- a striker movable back and forth in a striking axis direction, and
- a piston configured to move the striker back and forth;
- a crank mechanism placeable in the housing, the crank mechanism including
- a crank shaft rotatable when driven by a motor, and
- an eccentric pin on the crank shaft, the eccentric pin being movable eccentrically;
- a cap attached to the supply port in a removable manner;
- a first counterweight placeable in the housing at a position at which the cap closes the supply port, the first counterweight being movable in cooperation with the crank mechanism, and being configured to reduce vibrations in the striking axis direction resulting from the piston that is reciprocating;
- and
- a second counterweight placeable in the housing at a position at which the cap closes the supply port, the second counterweight being rotatable in cooperation with the crank mechanism, and being configured to reduce vibrations in a rotational direction resulting from the crank shaft.
8 more elements
Dependencies are inferred from the claim text.