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US 2011/0226500 A1Published application
Impact tool
AssigneeMakita Corporation
InventorsMasanori Furusawa, Yoshihiro Kasuya
Life of this patent
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Abstract
In an upper surface of a crank housing is provided an inlet for grease which is configured to be openable and closable by a cap. A vibration damping mechanism, which includes a counterweight provided with a connecting pin loosely fitted in a connecting hole of an eccentric pin when the cap is attached, is mounted in the cap, whereby the vibration damping mechanism is allowed to be taken in and out of the crank housing through the inlet by attachment and detachment of the cap to and from the inlet.
Claims13
An impact tool comprising:
- an impact mechanism provided in a housing and comprising an impactor for use in striking a bit and a piston configured to cause the impactor to move in accordance with a motion of the piston;
- a crank mechanism in which an eccentric pin provided at a motor-driven rotatable crank shaft is connected to the piston by a connecting rod, to convert a rotation of the crank shaft into a reciprocating motion of the piston;
- a vibration damping mechanism configured to move in synchronization with the crank mechanism to reduce vibration by canceling out a shift in the center of gravity derived from the reciprocating motion of the piston;
- and
- an inlet for grease, formed above the crank mechanism in the housing, and configured to be closed by a cap that is attachable to and detachable from the inlet,
- wherein at least part of the vibration damping mechanism is mounted to the cap in such a manner that attachment of the cap brings the vibration damping mechanism being capable of moving in synchronization with the crank mechanism, the at least part of the vibration damping mechanism being allowed to be taken in and out of the housing through the inlet by attachment and detachment of the cap to and from the inlet.
3 more elements
Dependencies are inferred from the claim text.