Patent GB-424861-A (GB)
Title: Improvements in arc welding apparatus
IPC: B23K9/067
Filed: 1934-03-26
Abstract: 424,861. Uniting by fusion. TRIPP, J. P., P.O. Box 4016, Montreal, Canada. March 26, 1934, No. 9425. Convention date, March 29, 1933. [Class 83 (iv)] [See also Group XI] A solenoid distinct and separate from the normal feed mechanism is automatically energized at constant potential to move the welding electrode to an arc striking position upon initial contact of the electrode with the work. Closure of the starting switch 149, Fig. 9, energizes coil 146 to close contacts 138, 138a 138<b>. The welding generator 128, due to excitation of its field 135, now feeds the armature 139 of the feed motor the field 140 of which is energized by the constant potential mains 14, 141. When the electrode touches the work the motor is short-circuited and the coil 133 causes closure of contacts 132<a> to close the circuit of coil 151. This latter coil causes closure of contacts 152, 153 to close the circuit through the arc-striking solenoid 154. The solenoid core is lifted and closes contacts 155 with consequent energization of coil 160 to open contacts 134 and 145. Thereupon contacts 132a are opened and the regulating rheostat 144 is put in series with the feed motor field. The position of the switch 157 determines the direction of rotation of the traverse motor 158 which has a field 159. Coil 162 controls contacts 162a, 162<b>, 162<c> and coil 164 controls contacts 164<a>, 164<b>, 164<c>. The apparatus can be stopped by opening the switch 148. The electrode is arranged in a vertical guide tube 75, Fig. 1, in a holder 79 coupled to a piston 77 attached to a rope passing over a sheave 74 to a drum 70 loosely mounted on the shaft of a worm reducing gear 68 driven by the feed motor 67. The drum is provided with a spring pressed pawl engaging a ratchet wheel fixed to the shaft. The sheave 74 is carried by levers 89 pivoted to posts 90 and the core of the arc striking solenoid 92. The solenoid and the posts are mounted on a plate 88 carried by the tube. The current supply lead 85 passes over a U-shaped guide 87 carried by the plate and is secured to a terminal 84 on the holder. The terminal 84 and the clamping screw 80 engage a longitudinal slot 81 in the tube. The guide tube 75 is secured to a frame 97 on which the motor and speed gear are mounted. A bearing sleeve 98 on the frame rotatably engages a vertical post 101 fixed to a sleeve 104 which may be moved longitudinally in an outer sleeve 105, fixed in the end of the welding arm 35, by rotation of a screwed spindle 111. A bracket 116, Fig. 7, secured to one side of the frame 97 carries a screwed adjusting spindle 118 on which is mounted a nut 120 engaging an arm 122 fixed to the post 101 By this means small angular adjustments of the frame may be made. According to the Specification as open to inspection under Sect. 91 the welding arm is bolted to a sleeve mounted on a vertical column carrying a casting on which is mounted motor driven drums for raising and lowering the arm. The casting is rotatably mounted. The column is carried by a truck fitted with a traverse motor and a quick return motor driving the truck axles through magnetic clutches. This subject-matter does not appear in the Specification as accepted.