GB234381A - Improvements in distributing devices for pneumatic hammers and similar pneumatic tools - Google Patents

Abstract

234,381. Paternoster, G. Nov. 22, 1924. Fluid-actuated gears. - In pneumatic hammers and like tools, the distributing-valve has two grooves 7, 8, is arranged coaxially within a sleeve at the rear of the cylinder which sleeve is provided with diametrically-opposed rows of radial ports 9 .. 14, is constantly subjected at each end to fluid pressure through ports 17, 18, and is reversed on opening the main exhaust 27 by the hammer 3. The supply is connected to the opposed end passages 12, 13; pots 11, 14 are connected to the atmosphere through passages 25, 26; ports 15, 16 are connected to the forward end of the cylinder by passage 22, and ports 9, 10 are connected to the rear end of the cylinder by passage 21. With the valve in the position shown, the hammer is moving downwards under the pressure of fluid supplied through ports 19, 13, 18, 9, 21; the front end of the hammer is exhausting through passage 22, ports 15, 11 by channel 8 in the valve, and passage 25. When the hammer 3 passes exhaust port 27, the fall of pressure on the lower end of the valve effects its reversal. Fluid pressure then passes through ports and passages 19, 17, 16, 21, 22 to the bottom of the cylinder, the upper end exhausting through passages 21, 10, 14, 26 and grooves 7 in the valve.