Abstract: A motor actuator includes a housing and an electric motor contained in the housing. The electric motor has a motor casing and a motor shaft protruding from a front face of the motor casing. The housing has a back wall behind a rear face of the motor casing. A gap space, which continues in a motor shaft direction, is formed between the back wall of the housing and the rear face of the motor casing. A counter region, which defines the gap space, is provided in the rear face of the motor casing. The motor actuator further includes a sound insulating member placed in the gap space, and covers the counter region in its entirety from behind.

Abstract: Apparatus and associated method for sharpening a cutting edge of a tool. In accordance with some embodiments, a side of the tool is placed in contacting engagement against a reverse sharpening guide surface to orient the tool at an acute angle with respect to an abrasive surface, with the abrasive surface extending in a lateral direction from a first end to a second end and the reverse sharpening guide surface located proximate the first end. The tool is moved away from the reverse sharpening guide surface and along the abrasive surface in the lateral direction toward the second end while nominally maintaining the tool at the acute angle so that a cutting edge of the tool is sharpened against the abrasive surface in a trailing cutting edge orientation with a top surface of the tool opposite the cutting edge maintained closer to the second end than the cutting edge.

Abstract: A method and apparatus for decontaminating structures which utilizes abrasive blasting in conjunction with a reverse air flow to remove contaminants from a structure. The apparatus comprises an abrasive blasting device for projecting abrasive material through a nozzle onto a structure at a high velocity. An enclosure is connected to the blasting device which surrounds the nozzle and forms a vacuum envelope around the nozzle and a portion of the structure being decontaminated. A vacuum apparatus is connected to the enclosure for providing a reverse air flow from the enclosure to a collection chamber in the vacuum. A high pressure pump/motor assembly delivers abrasion material at high pressure from a hopper to the blasting device. As contaminants are abraded from the structure, the reverse air flow provided to the enclosure causes the abrasive material and the material abraded from the structure to be collected in the collection chamber.

Abstract: An air tool includes a housing containing an air motor with a shaft rotatable about a longitudinal axis and connectable to an implement for working the surface of a workpiece. Power handle and idle handles have upper and lower ends connected to the housing at angularly spaced locations. Air power is supplied to the motor by an air passage extending through the power handle to an intake at the top of the housing. The upper and lower connections of the handles to the housing have axes extending generally perpendicular to each other and vibration insulators prevent metal to metal contact with the housing. One of the vibration insulators also is used in sealing against the loss of power air before entering the motor. Between their upper and lower ends, the handles are slanted at an angle of about fifteen degrees (15.degree.) relative to the axis of the tool.