| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce overall size by preventing a balancer from protruding in the radial direction. <P>SOLUTION: In an orbital sander 1, a body 2 including a motor 3 is provided with a spindle 7 that is rotatable by driving the motor 3 and an eccentric shaft 7A that is positioned eccentrically with respect to the center of rotation of the spindle 7 and that performs circular orbital motion along with rotation of the spindle 7, and a portion of the eccentric shaft 7A that projects downward from the body 2 is provided with a base 5 coupled via two bearings that are upper and lower bearings 18, 15 and a balancer 29 projecting to a side opposite the side of eccentricity of the eccentric shaft 7A. The balancer 29 is coupled to the eccentric shaft 7A at a position above the ball bearing 15, and the balancer 29 projects downward such that the lower end of an outer member 32 is positioned between the center of the ball bearing 15 and the lower surface of the base 5 in the up-down direction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
