Abstract: An apparatus for chemically treating the surfaces of printed circuit board work pieces (PCBWP's) includes a tank for holding a bath of the chemical treatment liquid. A receiving device is provided for receiving the PCBWP's from a conventional transport conveyor in a horizontal orientation, and immersing the PCBWP's into the bath in a substantially vertical orientation. A conveyor device in the tank is configured to hold the PCBWP's in the vertical orientation and to move them face-on through the liquid bath while a substantially uniform transverse flow of fresh liquid is provided between the work pieces. Another conveyor device receives the PCBWP's and elevates them out of the bath in the vertical orientation, subsequently returning them to a horizontal orientation for delivery to a conventional transport conveyor.

Abstract: A machine for use in chemically processing printed circuit board work pieces includes an inner basin within an outer basin. The inner basin holds a chemical liquid bath through which the printed circuit board work pieces are passed by a conveyor in a horizontal orientation along an action line parallel to their own plane. The conveyor includes facilities to oscillate the work pieces perpendicularly to their plane in the chemical liquid bath to effect flow of the chemical liquid through holes and apertures of the work pieces. Part of the chemical liquid bath continuously drains from the inner basin to the outer basin as the chemical treatment process is in operation. An eductor draws liquid from the outer basin and effects a low-pressure, high-volume up-welling of liquid into the inner basin. In this way, stirring of the chemical liquid bath is effected, and both temperature and concentration stratification of the chemical liquid bath is avoided.

Abstract: A stationary bicycle trainer includes a stand for supporting the rear of a conventional chain-drive bicycle in a normal riding position, and a chain-drive resistance device which is especially configured to be received at the rear drop outs of the bicycle between the chain stays and the seat stays of the bicycle frame in substitution for the rear drive wheel and tire assembly.