Patent ID: 8851960

Claim:
A rotary tool, comprising: a tool body, a drive shaft disposed in the tool body, a driven shaft to which a tool bit is attached, the driven shaft being prevented from moving in a longitudinal direction of the driven shaft relative to the tool body, an Oldham's coupling that is disposed between the drive shaft and the driven shaft and transmits rotation of the drive shaft to the driven shaft, an elastic element that is disposed between the driven shaft and the tool body, and a cover that covers the driven shaft, wherein: a recess is provided at least one of the cover and the tool body, and the elastic element is contained in the recess, the driven shaft is allowed to move in a direction transverse to the longitudinal direction of the driven shaft relative to the tool body, and during the relative movement, power transmission from the drive shaft to the driven shaft is maintained via the Oldham's coupling, and the elastic element absorbs the movement of the driven shaft relative to the tool body in the direction transverse to the longitudinal direction of the driven shaft.