A portable power tool comprises a housing, a motor with a driving mechanism for a cylindrical tool for sanding, rasping of filing a workpiece, and means for guiding and supporting the power tool on the workpiece surface. The driving mechanism includes means for rotating and oscillating the output shaft and the tool. The oscillating means includes a wobbling swash plate which is fixed to an intermediate shaft at a slant angle thereto, and follower means engaging the wobbling swash plate. When the intermediate shaft and the swash plate rotate, the follower means reciprocates to oscillate the tool along the output shaft axis.
An automatic abrasive sleeve tightening means and quick release system for an oscillating spindle sander is disclosed, in which a flyweight assembly automatically tightens the abrasive sleeve against the sanding drum of the oscillating spindle sander, upon activation of the sander's motor, without any manual manipulation thereof, and in which a quick release system, comprised of a pin assembly is used to lock down the top washer located atop the sanding drum and is used to release said top washer quickly and efficiently.
A hand-held oscillating spindle sander is disclosed. The sander includes a pair of toothed pulleys associated with the output shaft. The first pulley is attached to the output shaft for rotation with the output shaft. The second pulley is rotatably disposed on the output shaft for relative rotation with respect to the output shaft. The second pulley includes opposed camming surfaces formed on the inside thereof. A cam follower is attached to and extends from the output shaft so that it is positioned between the opposed camming surfaces. A pair of belts are respectively entrained around the first and second pulleys from a jackshaft rotatably received in the housing. Upon rotation of the belts, both pulleys rotate, but at slightly different speeds. This slight difference in speeds causes the cam follower to move along the opposed camming surfaces to create an oscillation effect for the output shaft. A dust recovery system is associated with the base of the tool proximate to where the sanding tools engages the workpiece.
