Electric hammer
AssigneeMakita Corporation
InventorsHiroki Ikuta, Yonosuke Aoki
Life of this patent
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Abstract
An electric hammer comprising a hammer bit performing hammering work on a work, a drive motor, a hammering piece driven by the drive motor to apply a hammering force to the hammer bit, and a mechanism for damping vibration generated during hammering. The damping performance of the electric hammer is enhanced by causing the driving amount applied to the damping mechanism to vary between a first mode where the damping mechanism generates vibration of the hammer bit subjected to an external force from the work during the load driving time and thereby optimizes the damping and a second mode where the damping mechanism generates vibration corresponding to the vibration of the hammer bit not subjected to an external force from the work during the no-land driving time and optimizes damping.
Claims10
An electric hammer comprising:
- an electric hammer body to which a hammer bit is coupled to perform a hammering operation in contact with a workpiece,
- a driving motor that is housed within the body,
- a striker that is housed within the body and driven by the driving motor to supply a striking force to the hammer bit,
- a vibration reducing mechanism that reduces vibration caused in the body during hammering operation performed on the workpiece by the hammer bit, and
- a controller that is configured to optimize vibration reduction by the vibration reducing mechanism according to detected load conditions, wherein:
- during the hammering operation, the controller detects the load conditions of the hammer bit based on an external force acting on the hammer bit from the workpiece side by the magnitude of the load current of the driving motor.
Dependencies are inferred from the claim text.