Oscillation tool

An oscillation tool comprising:

• a driving unit including a driving motor for driving and rotating a driving shaft with an eccentric shaft provided to a tip of the driving shaft;
• a swing arm including a housing portion on one end side of the swing arm, the eccentric shaft engaging with the housing portion within which the eccentric shaft is slidable from a default position in the housing portion along a rotation axis of the driving shaft;
• and
• an oscillating unit including an oscillating shaft connected to the swing arm;
• and
• a spring member between the driving unit and the oscillating unit for biasing the driving unit and the oscillating unit in a direction away from each other along the rotation axis of the driving shaft in order to return the eccentric shaft to the default position in the housing portion of the swing arm, wherein
• when opposing forces towards each other act on the driving unit and the oscillation unit and, the eccentric shaft slides from the default position in the housing portion,
• when no opposing forces act on the driving unit and the oscillation unit, the eccentric shaft slides and returns to the default position in the housing portion, and
• the spring member allows the driving unit and the oscillating unit to change their relative position along the rotation axis, causing the eccentric shaft to slide within the housing portion of the swing arm along the rotation axis, in order to change an amplitude of the oscillating shaft.