Abstract: A filter and muffler device for use with a vacuum mechanism having an outlet port is particularly designed to muffle sound exiting from the outlet port as well as to filter the outlet exhaust. The device includes a filter element which is generally rectangular in plan view and which has opposed lateral sides and opposed longitudinal sides. The filter element has a direction of filtration from a planar bottom to a planar top thereof, and is preferably a HEPA type filter. The device also includes a housing in which the filter element is located. This housing includes a generally flat upper wall parallel to and spaced from the top of the filter element; respective lateral and longitudinal side walls connected to the upper wall and extending generally parallel to the respective lateral and longitudinal sides of the filter element; and a lower wall spaced from the upper wall, extending between the lateral and longitudinal side walls of the housing, and located opposite the bottom of the filter element.

Abstract: A fluid actuated, valveless sanding tool is disclosed which comprises a housing containing a cylinder, a double-ended piston mounted for reciprocal movement within the cylinder, a mounting plate to which an abrasive tool can be attached, and a double rack and pinion connecting means reciprocally driving the mounting plate. A fluid supply system delivers pressurized fluid to a central portion of the bore and a vent system permits venting of the ends of the cylinder. The piston has two end seals and three internal, main seals which maintain a fluid tight relationship with the inner cylinder wall. Two internal passages in the piston are in communication with the annular areas between the three main seals and the respective ends of the piston.