Patent GB-499653-A (GB)
Title: An improved method of, and means for, coating the inside surfaces of metal containers
IPC: B05C7/04
Filed: 1937-07-23
Abstract: Containers open at one end, particularly metal containers for fruit and other foodstuffs, are completely coated internally by placing in the upright container sufficient liquid to form the coating, inverting the container, and spinning it about an axis passing through both ends to spread the coating liquid; in a simplified form of apparatus, the containers are filled substantially completely, inverted, and drained without spinning. In the apparatus shown in Figs. 3 and 4, containers 12 made from lacquered and stoved sheet metal are pushed along rails 11 by transverse brackets 4 carried by a pair of parallel conveyer chains 13 moved intermittently by a crank-pin on shaft 25 engaging a star-wheel on shaft 35 which is geared to the sprocket shaft 15. The container in the position 12a receives coating liquid from a reservoir 34 through a valve 33 operated by a cam on the shaft 25. On reaching the end of the rails 11 the containers <PICT:0499653/III/1> <PICT:0499653/III/2> <PICT:0499653/III/3> fall in inverted position on to lower rails 54 above a drainage tray 55, being guided by side rails 53, 67.  The containers are moved intermittently along the rails 54 by a reciprocating frame 49 actuated from the shaft 35.  For this purpose, each container is moved from position 12b to position 12c by a bracket 106 fixed on the frame 49, and from position 12c to further positions by brackets 56 which are pivoted on the frame 49 and are turned aside during the return stroke.  During the forward movement of the frame, pins 71 thereon move beneath weighted levers 70 pivoted on the rails, so that the ends 68 of the levers stop the containers in correct position.  At position 12d (or at two or more such p positions, as 12c and 12d) the containers are picked up by an electromagnet 73, are spun about a vertical axis by a motor 76, and are then dropped back on to the rails.  The electromagnet and the motor are controlled by cams on the shaft 25.  After leaving the rails 54, the containers may be stoved for 15 minutes at a temperature not above 310 DEG  F.  Modifications not shown, include moving the liquid-feed device 34 so that the feed may take place without stopping the containers, inverting the containers by positive means, and replacing the electromagnet by a suction cup or a mechanical grip.  As shown in Fig. 7, in transverse section through the upper run of the conveyer chains 42, the containers are held on bridge-pieces 79 between the chains by gripping-arms 81, which are controlled by fixed cams (as 87) so as to open for receiving the containers to be coated and for dropping the coated containers on to a delivery conveyer.  In this modification, the containers stop beneath a filling device and are filled substantially completely, then overturned through 135 DEG  and stopped in that position for drainage.  In another modification, Figs. 8 and 9 (not shown), the charged containers are held laterally instead of forwardly.  When the spinning operation is omitted, the containers are positioned so that, when emptying, the longitudinal seam is lowermost.