Abstract: Apparatus operable by actuating a trigger to cause high-pressure air from a compressor to jet out from the front end opening of a nozzle and to simultaneously produce an air curtain in the form of a conical air layer surrounding the air jet and spreading out from an annular fine clearance provided approximately at the base portion of the nozzle.

Abstract: Dust removing apparatus includes an air valve operable by a trigger-type push button to permit or interrupt the flow of compressed air from a compressor into an air discharge passage. When the valve is opened, the compressed air flows through an annular slit into the air discharge passage at an increased pressure, producing suction at the inlet of an intake member by an ejecting action. The dust removing apparatus further includes another valve which, when in open position, changes the path of flow of air to force out the compressed air from a nozzle.