Patent GB-500035-A (GB)
Title: Improvements in or relating to apparatus for baking radiator cores
IPC: B22C9/14
Filed: 1937-04-29
Abstract: 500,035. Furnaces for soldering radiators. MUNCH, H. S., and BOERGER, M. G. April 29, 1937, No. 30124/38. Convention date, Sept. 16, 1936. Divided ont of 497,927. [Class 51 (ii)] A device for feeding radiator cores to be soldered into and out of an oven comprises fixed rail supports 32 extending through and outside the oven and a carriage 110 running on vertically-movable tracks 96 at the front and rear of the oven, the arrangement being such that when the tracks are raised, cores will be lifted from the supports at the feed end and within the oven, and after horizontal movement of the carriage and lowering of the tracks the cores will be deposited within the oven and outside the discharge end respectively. The plant described comprises an oven unit, an acid tank adjacent the feed end into which the cores are dipped before heating, and a squaring- press at the discharge end, these constructions forming the subject-matter of Specifications 497,927, and 498,006 and 498,006, [both in Group XXII], respectively. The tracks 96 for the carriage 110 are located outside the oven at both ends and between the rails 32, and are moved vertically to raise the supporting surface of the carriage above the level of the rails by an hydraulic cylinder 103 operating through levers 100 and push-rods 99, the carriage being reciprocated horizontally by a further cylinder. When the carriage is in the fully retracted position, the forward end extends just beyond the discharge door, and the length of travel is such that the carriage can move simultaneously a dipped core from the charging station into the oven, and a heated core from the oven to the squaring-press. The return stroke is made with the tracks 96 in their lowered position. A stop 121 on the carriage, against which an edge of a core to be charged is positioned, ensures that the cores are deposited within the oven and at the press with their trailing edges in a predetermined position. The rails 32 may be made of A-section in order to deflect acid drippings from the cores clear of the operating- gear for the tracks, and pans may be provided' to catch the drippings. The ends of the oven are closed by vertically sliding doors 12 interconnected for simultaneous operation from an hydraulic cylinder by intersecting quadrants. The 'doors may have extensions 125 to pass between the side bars 111 of the carriage. Automatic control.-An electrohydraulic system is described by which the operation of the various cylinders in proper sequence is automatically controlled. Assuming that the carriage has just been operated to deposit a dipped core within the oven and a heated core at the squaring press, pressure fluid is admitted to the cylinders for lowering the carriage tracks and retracting the carriage. Complete withdrawal of the carriage is followed by closing of the oven doors, the starting of a timer, and the operation of the squaring press. At the end of the heating-operation, the'length of which is determined by the timer, a switch is actuated to ring a signal bell, and to change over a valve which rearranges the connections to release the cooled core from the press and lower it back on to the track from which it is then removed. The doors are next opened and the completion of this operation initiates the lifting of the carriage track and the movement of the carriage on its feeding stroke. Finally, the track is lowered and the carriage retracted. Where the completion of one operation initiates two or more which must take place successively, spring-loaded delay action valves are interposed at appropriate points in the circuits, and throttle valves are brought into action when 'slow movement is desired, e.g. of the carriage 110 at each end of its stroke.