Abstract: An abrasive belt machine is disclosed as including a stationary base for mounting parallel, belt drive and tension control rollers and a support arm having a free end portion projecting from the base; a contact arm for mounting an idler roller; mounting means for removably mounting the contact arm on the free end portion of the support arm for pivotal movement about a belt position adjustment axis disposed parallel to the axes of the belt drive and tension control rollers and the idler roller; and first, second and third tension rollers mounted for movement with the contact arm and serving to guide an abrasive belt for passage over the idler roller, during pivotal movement of the contact arm about the adjustment axis through upwards of essentially 180 degrees.

Abstract: An exhaust shroud adapted for mounting on the casing of a portable sanding machine is provided with a resiliently deformable lip arranged to engage with a surface of a driven sanding member or workpiece outwardly of such member in such a manner as to provide for an effectively controlled, vacuum induced flow of dust generated by a sanding operation into the shroud, while at the same time not producing a vacuum induced braking effect on movements of the sanding member or movements of the machine relative to the workpiece.

Abstract: A belt grinder having a casing, a drive pulley supported in the casing, a contact pulley mounted on an arm extending from a forward opening in the casing, and endless belt trained about the pulleys, a pneumatic motor housing projecting into the casing, passages in the housing communicating with an annular chamber in the casing, and a fitting secured to the housing having an exhaust passage in communication with the interior thereof, a nozzle member located in the exhaust passage and a slotted passageway communicating with the annular chamber and with the outer periphery of the nozzle member.

Abstract: A pair of guide wheels are provided for a manually manipulated abrading device of the endless abrasive belt variety for preventing the gouging of the surface of a workpiece when a raised imperfection, such as a weld bead, is abraded by operation of the belt to lie flush with such surface. The guide wheels define an annular and radially outwardly opening groove in which a tire formed of a relatively non-deformable material is supported to undergo relative radially directed displacements incident to rolling of the tire along the surface of the workpiece. The guide wheels are adjustable to vary the width of the groove for purposes of controlling the extent of radially directed displacements of the tire, and thus the position of the belt relative to the surface of the workpiece.

Abstract: A portable belt grinder having a casing, a drive pulley supported in the casing, a contact pulley mounted on an arm extending from the casing, an endless belt trained about the pulleys and a belt tensioning assembly having a roller eccentrically mounted on a manually rotatable rod, a camming surfaced plunger coacting with the roller and a spring interposed between the arm and the plunger. A cover is pivotally mounted on the casing having an aperture which coacts with a latching button rotatably fixed to the casing and having a vertical axis slightly spaced from the vertical axis of the aperture.

Abstract: An adapter is provided to facilitate quick change mounting of rotatable grinding elements without the use of a tool, such as a wrench or key.

Abstract: A pair of guide wheels (6) for a hand held abrading device (1) of the endless abrasive belt (2) variety for preventing slewing, side slipping and gouging of the surface of a workpiece (8) when a raised imperfection (9) such as a weld bead is abraded to be flush with the surface (10). The guide wheels (6), mounted on the axle (5) of the contact wheel (3) of the device, are circumferentially adjustable to compensate for different radial dimensions of the sum of the thickness of the abrasive belt and the radius of the guide wheel and include a resilient tire guide ring (11) and a circumferentially round guide surface (12) having different radii at different lateral positions.