Patent GB-761673-A (GB)
Title: Improvements relating to terminal lugs of electrical components
Inventor: ELLIN FREDRICK ISSAC
IPC: H01R43/02
Filed: 1954-02-01
Abstract: 761,673. Making electric components; welding by pressure. SIEGEL, D. T. Feb. 1, 1954, No. 2961/54. Classes 83 (2) and 83 (4). [Also in Group XXXVI] Resistor terminals 36, 38, Fig. 14, are buttwelded to projections 30, 32, formed by the end of metal bands 26, 28, on a ceramic core 22 to which bands a wire resistance element 24 on the core is welded. The band ends are spot-welded together to form the projections and a vitreous enamel coating is provided over the element 24 and the bands. A resistor 20 having a terminal 38 already welded to one projection thereof is placed on a mandrel 74, Figs. 1 and 2, mounted on a conducting arm 48 connected to a source of welding current and pivoted on a base 40. The arm 48 is normally urged into a raised position by a spring. The other projection is located between normally open jaws comprising a fixed jaw 82, Figs. 2 and 3, and a movable jaw 128 carried by an arm 118, Fig. 2, pivoted in a member 90 having arms 92, 94 on the arm 48. With the arm 48 raised the end of the arm 118 remote from the jaws is urged towards the arm 48, compressing a spring 122 in the arm 48, by a cam 116 acting on the end of the arm 118. The cam is carried on an arm 112 pivoted by means of a shaft 108 passing through the arm 48 and having limited rotation determined by the movement of a rod 106 fixed to the shaft 108 and located between the arms 92 and 94. The end of the arm 112 remote from the cam is connected to the end of a piston-rod 140 in a cylinder 130. A terminal 36 to be welded to the resistor is placed in normally open jaws 174, 182, Figs. 1 and 3, projecting from a cylinder 148 secured to the base 40. The jaw 174 is connected to the welding current supply and a hydrogen supply pipe 222 and a spark igniter 224 are arranged near the jaws so that burning hydrogen to prevent weld oxidation may be supplied. The jaw 182 is pivoted to the support 164 for the jaw 174 and is connected to the rod 198 of a spring-pressed piston 186 the cylinder of which is connected to the support 164. A roller 212 moved by a piston in a cylinder 202 acts on the jaw 182 to normally open the jaws. A spring 162 urges the jaws upwardly. The valves controlling flow of air to cylinders 130 and 202 are solenoid-operated and normally are in a position in which the piston 140 is raised and the roller 212 is thrust forward. To start the operation, hand switches are closed to energize the solenoids of the cylinder valves so that the piston of cylinder 202 moves to the right and the spring-pressed piston 186 closes the jaws 174, 182 to clamp the terminal 36. The piston 140 is lowered to rotate the arm 112, the cam of which allows spring 122 to close the jaws 82, 128 on to the projection. Further piston movement lowers the arm 48 to contact the projection and terminal. A contact arm is driven over switch contacts to firstly shunt the hand switches and render the operation automatic. Switches controlling welding current, hydrogen flow and the spark igniter means are closed and after welding are opened when the arm 48 returns to its normal position. It is stated that the invention is applicable to some kinds of choke and capacitor.