| 摘要 |
1,222,207. Welding by pressure. JOSEPH LUCAS (INDUSTRIES) Ltd. 21 Aug., 1968 [8 Sept., 1967; 1 Jan., 1968], Nos. 41066/67 and 16/68. Heading B3R. [Also in Division H1] Plate groups 13 situated in adjacent cells of an electric storage battery are interconnected through a hole in partition wall 12 by connecting them to a pair of conductive bars 15 formed with integral straps 16 which extend parallel to wall 12 placing the plate groups 13 in their respective cells applying a force to a projection 31 on at least one of the straps 16 which exiends from the strap 16 away from partition wall 12 e.g. by applying pressure with tool 18 which incorporates a pair of welding electrodes 21, 22. The projection 31 moves into the hole in wall 12 relative to the strap to make contact with part of the other strap and a connection is made by means of resistance welding. One or both of the straps may have a projection which may be integral therewith or separate therefrom but forms a tight fit in a hole in its strap. The straps are preferably formed with upstanding rings which bite into the partition wall forming a tight seal. A resistance welding electrode which is used to interconnect the plate groups includes a body 61 having in one surface a slot in which a leaf spring 62 is secured by means of screw 63. The free end of spring 62 incorporates an adjustable grub screw 64 urging a stepped cylindrical insert 66 into stepped portion 65a of bore 65 formed in body 61. Bore 65 is shaped as shown at 65b to accept the connecting portions of the plate groups to be welded and the arrangement is such that during welding the spring 62 will first flex and then apply a controlled pressure to the said portions through screw 64. In an example a 50 c.s. mains supply was used and a force varying between 750 and 1500 pounds -was applied for 20 cycles, the increase being due to the recovery of the spring 62. A current of 6500 amps. was then passed for 60 cycles after which the pressure was maintained for a further 5 seconds. |
