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US 10,864,622 B2Granted
Striking tool
AssigneeMakita Corporation
InventorKiyonobu Yoshikane
Life of this patent
Estimating the term…
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 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 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 in the housing at a position at which the cap closes the supply port, the first counterweight having an elongated hole (1) extending perpendicular to the striking axis direction and (2) that receives a member that causes movement of the first counterweight relative to the housing, 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 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;
- wherein the first counterweight is slidable in the striking axis direction but is not rotatable relative to the housing.
9 more elements
A striking tool, comprising:
- a housing including a supply port;
- a striking mechanism 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 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 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;
- a second counterweight 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;
- and
- a bearing axially supporting the second counterweight, wherein:
- the second counterweight and the bearing are mounted on the cap;
- and
- the second counterweight includes an engageable portion engageable with the eccentric pin, rotates in cooperation with the eccentric pin, and is mounted on the cap.
12 more elements
A striking tool, comprising:
- a housing including a supply port;
- a striking mechanism 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 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 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;
- a second counterweight 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, and
- a bearing axially supporting the second counterweight, wherein:
- the second counterweight and the bearing are mounted on the cap;
- the second counterweight includes:
- a rotatable member axially supported by the bearing and held in the cap in a rotatable manner;
- and
- a connecting member engageable with the eccentric pin to receive rotation;
- and
- at least one of the rotatable member or the connecting member includes a weight portion.
15 more elements
Dependencies are inferred from the claim text.