GB1202882A - Improvements in and relating to the resistance welding of sheet metal coated with a layer of non-metallic material to another metal member - Google Patents

Abstract

1,202,882. Coating apparatus. O. A. BECKER. 8 Sept., 1967 [21 Sept., 1966; 11 Nov., 1966; 7 Jan., 1967], No. 41049/67. Heading B2L. [Also in Division B3] Insulating material forming a coating on sheet metal members is removed in circular or elongated areas by milling, rasping or grinding to permit resistance welding of the members and subsequent to welding the areas are re-coated. A machine for applying adhesive tape to the bare welded edges 192a, 193a Fig. 51 of a workpiece comprises a casing 305 having inclined slots in which are mounted the shafts 195a, 195b or rollers 190a, 190b urged together by springs 194. A plate attached to the casing carries a reel for adhesive tape 191 which is led over a grooved roller and past the rollers 190a, 190b to a tensioning means, tape cutters being arranged on each side of the casing. In operation the edges 192a, 193a are pushed between the rollers 190a 190b, the tape being thus folded over the edges and the machine is moved relatively to the edges. In another use of re-coating strip, a folded strip is placed over the bare edges and a device having rollers pressed together is moved along the edges. An apparatus for re-coating circular bare areas comprises a cylindrical reservoir (322a) Fig. 55 (not shown) containing a pasty substance pressed by a piston into a distribution chamber. The welded edges having the bare areas are pressed into a slot in the chamber between spring pressed sliders to be re-coated, the sliders scraping off excess pasty substance in withdrawal of the edges. The substance may be dried by a heated air flow. An apparatus for spraying lacquer on the bale areas comprise a motor driven trolley mounted by rollers 920, Fig. 57, on a rail 919 and carrying on a pivot 925 a reservoir 921 and a spray nozzle 933 supplied with compressed air. A V-shaped scraper 928 is mounted on the trolley to scrape lacquer into the areas to be coated. In one modification, instead of a spray nozzle, a broad nozzle for pasty materials is employed and in another modification a sponge is used. In a device for applying an adhesive tape of coating material a reel 943, Fig. 63, is provided on one end of a lever having a presser roller 944 on its other end, the roller being urged away from the work by a spring and towards the work by a pneumatic cylinder 946. A second presser roller 947 is arranged adjacent the first and the assembly is carried on a trolley on a rail 919.