| 摘要 |
PURPOSE:To attain excellent plating effect for an inside surface by discharging completely and surely air incorporated in the inside of a baggy material to be plated such as a box nut in a period of immersing the material to be plated in a liquid bath. CONSTITUTION:For example a box nut B is immersed into plating liquid C in such a state that it is fitted to the tips of both a holding arm 2 of a rack A and a branched pipe 5 of a plating auxiliary tool 3. A check valve 6 of the tool 3 is closed by the ascent of a ball 62 due to buoyancy and the inflow of plating liquid C to the inside of the tool 3 is inhibited. Furthermore when sinking the rack A, plating liquid C is introduced into the inside of the box nut B and the opening part of the box nut B is choked by plating liquid C. According as the rack A is sunk the pressure of liquid in the box nut B is risen and the air enclosed in the box nut B is extruded by the liquid pressure and introduced into the inside of the branched pipe 5 through an aperture of the tip of the branched pipe 5 and discharged to the outer part through a main pipe 4.
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