GB322118A - An improved process and apparatus for the electrolytic removal of metal from metallic bodies - Google Patents

Abstract

322,118. Coles, S. O. Cowper-. June 5, 1928. Metals, removing; band conveyer apparatus; electrodes, mounting; preparing and treating surfaces.-In a process for the electrolytic removal of metal from metallic bodies there is added to the electrolyte an abrasive material, such as sand or pumice powder, which lies at the bottom of the bath and through which the blanks operated on are caused to pass. The process is described in connection with an apparatus for pointing needles. A pair of travelling endless chains 3 passing over sprocket wheels 4 are provided at intervals with sockets (not shown) in which rods 8 connecting the chains are inserted. These rods support carriers 9 in which the blanks 10 are fitted. A pair of insulated rails 11 on which the rods 8 rest, and which also serve for connecting the electric current to the blanks, bend downwards over the electrolytic bath 1, thereby gradually introducing the points of the blanks 10 into the electrolyte containing abrasive, and then gradually withdrawing them. Guiding sprocket wheels 12 may also be used for the same purpose. The motion of the upper part of the chain 3 being from right to left, each carrier 9 as it emerges from the bath 1, bears on the curved end of the horizontal plate 14 which has recesses (not shown) for the accommodation of the blanks, and is lifted clear of the rods 8. Each carrier on leaving the rods is supported by its lateral projections 16 adapted to engage grooves 17 in horizontal bars 18. The blanks are clamped against opposite serrated sides of a central block by rubber-faced side blocks operated by rotary collars having a cam action. In using the process for removing the splay from the eyes of needles after stamping the remainder of the needle is coated with a material which resists electrolytic action.