| 摘要 |
PURPOSE:To lower height and to lighten a self-weight by composing a rotary driving shaft inside the main body cylinder and a pressurizing force mechanism at the outer peripheral part with their superposition. CONSTITUTION:A pressurizing force mechanism is composed by supporting a rotating grindstone shaft 3 freely movably in the rotating and axial directions inside a sliding cylinder 4 on the center part of a main body cylinder 1, engaging the upper end spline part 3a of the rotating grindstone shaft 3 with the spline hole of the driving piece 5 supported on the center upper part of the main body cylinder 1 as well and fitting the outer peripheral piston ring 4a of a sliding cylinder 4 to the cylinder room C of the main body cylinder 1. An air joint is provided on the joining end face of this main body cylinder 1 and also an uneven joint 5b is equipped on the end face of the driving piece 5. |
