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The lowering or withdrawal movement of container is extremely steady and smooth since this container descends solely by gravity, the speed of descent being easily set or determined by the adjusting of valve. This steady downward movement of the container is conducive to the production of perfectly coated objects,since no motor means is operating to set up vibrations in the coating liquld which would produce rings or wrinkles on the work. After the articles have been coated the panel may be removed and another panel carrying objects to be coated, substituted in its place. Thus, the output of the machine is very large for each reciprocation of the piston effects a coating operation.
As many changes could be made in the above construction and many apparently widely different embodiments of this invention cold be made without departing from the scope thereof, as defined by the following claims, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
I claim:--
1. In a dipping machine of the character described, a vertical hydraulic operating cylinder, piping connecting said cylinder to a supply of water under pressure and to a drain, a piston reciprocatable within said cylinder ,a piston rod extending upwardly from said piston and through the top of said cylinder, a container carrying platform mounted on the top of said piston rod, a container on said platform, and stationary work carrying means positioned above said platform,whereby upward movement of said piston due to the admission of water under pressure from said piping causes said container to rise so that coating liquid therein will envelop work supported by said work carrying means, some of the water under pressure escaping through said piping to the drain during the upward movement of ripples on the liquid surface of said container and hence producing perfect coating.
2. In a dipping machine of the character described, a vertical hydraulic operating cylinder, piping connecting said cylinder to a supply of water under pressure, valve means connected in said piping for controlling the supply of water to said cylinder, a piston within said cylinder and having a piston rod extending upwardly and out through the top of said cylinder, a container carrying platform mounted on the top of said piston rod, a coating material container on said platform, and stationary work carrying means positioned above said platform, whereby one operation of said valve means admits water under pressure to the underside of said piston and serves to effect upward movement of said piston and said container so that the coating liquid therein envelops work depending from said work carrying means, means for steadying said upward movement and another operation of aid valve means allows the gradual escape of water from below said piston and serves to effect the lowering of said piston and said container by gravity so that the coating liquid is Withdrawn from the work, the upward and lowering speeds of said container being determined by the setting of said valve means ,said speeds being respectively faster and slower than the natural speed of flow of the coating liquid used.
3.In a dipping machine of the character described, a hydraulic cylinder, a piston movable within said cylinder and having a piston rod extending upwardly and out of said cylinder, a coating material container carried upon the top of said piston rod, a stationary work holding member positioned above said container, piping connecting the bottom of said cylinder to a source of water under pressure and to a drain , valves connected in said piping for controlling the flow of water under pressure to said cylinder beneath said piston and for controlling the flow of water from said cylinder to the drain, whereby said piston and hence said container may be raised and lowered at desired predetermined speeds to effect the coating of work carried by said work holding member, the valve connecting said cylinder to the drain being continuously open whereby water hammer is eliminated and perfect coating of articles is obtained.