Patent ID: 6176437
Filing Date: 2001-01-23
Classification: B05B,B08B,B24C,F16K,Y10T

Abstract:
Dusting gun for operation with compressed air in which the dynamic effect of air pulses is utilized for the removal of foreign matter, said dusting gun comprising:a handle section (1) with a trigger lever (2), and trigger guard (3), an extension barrel (4) connected to the handle section, an exchangeable nozzle pipe (5) connected to the extension barrel, and an exchangeable nozzle bit (6) at the end of the nozzle pipe;an oscillating shut-off valve built into the handle section,said oscillating shut-off valve having an inlet for compressed air, a valve seat (9) and an outlet air duct (16);a cylinder (13) formed within said shut-off valve, an oblong valve body (10) longitudinally displaceable within said cylinder, said valve body having one end forming a cone shaped disc (11) in sealing contact against the valve seat (9) for shutting off the compressed air flow through the dusting gun under the influence of a compression spring (17), and the other end of the valve body forming a piston (12) movable within said cylinder;a first longitudinal bore (15) through said valve body for providing a pressure connection between a rear portion (13a) of said cylinder and said extension barrel through the outlet air duct;a second longitudinal bore (18) for providing a permanently open connection between a front portion (13b) of the cylinder and an air chamber (19) into which compressed air is fed when operating the trigger lever;wherein the size and weight of the cone shaped disc (11), the piston (12), a friction between the piston (12) and the cylinder (13), the first and second bore cross-sectional area, and the spring characteristic of the compression spring (17) are configured to cooperate with the air flow resistance caused by the nozzle (6) at the end of the nozzle pipe (5) so that when the trigger lever (2) is operated, the shut-off valve acts under the influence of the compressed air which is imparted, to oscillate with a frequency of about 2-50 Hz causing the generation of air pulses by the valve opening and closing the air flow.