| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary processing tool which enables improvement of the durability of a portion forming a cushioning function for easing a reaction force exerted on a processing member during processing work.SOLUTION: A rotary driving shaft making driving connection with an air motor has: a first shaft 22; a second shaft 24; and a coil spring 40 which is set between the first shaft 22 and the second shaft 24 and allows the second shaft 24 to move to the first shaft 22 side while elastically deforming. A tip part 22b of the first shaft 22 and a base end part 24a of the second shaft 24 respectively have a first slide surface 28a and a second slide surface 30a which extend in parallel to a longitudinal axis line L of the rotary driving shaft. The first slide surface 28a and the second slide surface 30a engage with each other in a sliding manner to allow the second shaft 24 to displace relative to the first shaft 22 in a direction of the longitudinal axis line L and be relatively fixed to the first shaft 22 in a rotation direction of the rotary driving shaft.SELECTED DRAWING: Figure 2 |
