Patent GB-756426-A (GB)
Title: Improvements in or relating to a method of and apparatus for securing handles to metal containers
IPC: B01J37/02
Filed: 1952-04-03
Abstract: 756,426. Making handles. BERGER & SONS, Ltd., L., and LAWRENCE, J. E. July 3, 1953 [April 3, 1952], No. 8596/52. Classes 83 (2) and 83 (4). Jointing by stamping.-A method of securing handle lugs to sheet metal containers such as paint cans, kegs and drums comprises forming a depression in the metal sheet of the container to accommodate the base of a lug, placing the lug to lie with its base deposited within the depression and thereafter pressing the sides of the depression inwardly at a level above the base of the lug to retain it in position within the depression. The depression is formed in the sheet metal by means of dies 1 and 2 the bottom die 1 comprising a former 3 surrounded by a pressure ring 4 carried on pins 5 which pass through the base of the die and the die bed 7. The pins 5 engage the buffer plate 8 of a resilient rubber buffer 10. The top edges of the former 3 are radiused. The upper die 2 has a spring- loaded central member 14 having radiused edges 18 said member co-operating with the former 3 to form the depression 13. After the forming operation the member 14 ejects the sheet metal from the upper die and the pressure ring 4 raises the sheet metal above the former 3. The second pressing operation is carried out using a lower die member 21 formed with an inverted conical surface 24 in which are located a number of co-operating tapered clenching jaws 25 having inwardly directed lips 26. The jaws are bolted to a pressure plate 29, the bolts 28 being engaged by springs 30, located in radially-disposed recesses in the pressure plate said springs urging the bolts and clenching jaws radially outwardly. The pressure plate is mounted on bolts 33 which engage a resilient buffer 36. The metal sheet with its depression extending downwardly is placed on the flat surface of the jaws and a domed lug 43 is disposed within the depression. The upper die has a spring-loaded plunger 40 shaped to accommodate the lug 43. In operation, as the upper die moves downwardly the plunger 40 forces the lug firmly into the depression whereafter the sheet is clamped between the die surface'39 and the jaws. Further downward movement causes the clenching jaws to move inwardly so that the lips 26 engage the side of the depression above a rim 44 on the lug and force it inwardly to clench the lug in position on the metal sheet. The final pressing operation is carried out with a lower die 46 having an inner die member 47 formed with a hole for receiving the domed lug with the partially clenched part 45 engaging with the lip of the hole. An upper die member formed with a recess 50 fits over the clenched part of the depression and the dies are brought together to firmly clench the edge 44 of the lug in the metal sheet. This final pressing operation may be dispensed with if the lugs are required to possess some freedom of movement in the depression. The method may be carried out either on the sheet metal which is thereafter formed into a container or on the formed container in which case the surfaces of the dies will need to be appropriately curved.