Patent GB-558223-A (GB)
Title: Improvements in or relating to electric soldering apparatus
IPC: B23K3/03
Filed: 1942-06-19
Abstract: 558,223. Electric-soldering apparatus. STANDARD TELEPHONES & CABLES, Ltd., (trading as STANELCO PRODUCTS), and WARD, G. L. June 19, 1942, No. 8439. [Class 83 (iv)] An electric soldering apparatus comprises an overhanging support mounted on a bench and having a plunger carrying an electrode or electrically cheated bit vertically movable therein so as to be brought down to or removed from the work. A curved arm 3 of electrically conducting material and split longitudinally into two portions 3a, 3b, which are insulated from each other, has integral portions 5c, 5d which rest on insulation 11 on a work holding bar plate 1 secured to a bend 2. The portion 3a ends in a circular boss 10 in which is secured a bush 12, which serves as a guide for an electrode or tool carrying plunger 17 which is retracted by a spring 19 and moved forward by the inner wire 15 of a Bowden cable passing through slots in the bush and plunger and in the inner side of the part 3a. The other end of the wire 15 is secured to a nipple screwing into a collar 22 in which is screwed a rod 23 adjustably mounted in a barrel 24 according to the height of the bench 2 above the ground. Through a cap 28 in the lower end of the barrel passes a rod 26 which'is controlled by a spring 30 and is pressed down by a treadle 31. The treadle carries an arm 35 with an adjustable stop 36 held against an adjustable fixer stop 37 by the treadle returning spring 33. When the treadle is pressed the tool or electrode carried by the plunger 17 is brought down on the work' and the stop 36 just touches a switch plunger 39. Further depression of the treadle compresses the spring 30 and causes the stop 36 to close the switch. The positions of switch and stop 37 relatively to the stop 36 may be reversed to obtain a positive limitation of the movement of the plunger 17, a switch being used which is closed by release of the plunger 39 and this taking place soon after movement of the stop 36 has commenced. A bolt 8 passing through the arm 3 and insulated from the portion 3a thereof is provided with terminals 6a, 6b for the lugs of cables which are connected to the electrode or tool carried by the plunger 17. The base plate has three terminals 41-43, of which terminals 41, 43 are insulated therefrom and 42 electrically connected thereto, the terminals 41, 43 being connected when required by straps 44, 45 to terminals 5b, 5a on the parts 5d, 5c. The electrode may consist of a split carbon cylinder the two halves of which are insulated from the plunger and connection between them being effected when they are brought down into contact with the work. In this case the supply is connected to the terminals 41, 43. The plunger 17 in another form may hold a copper bit heated by a wound electric heater or by two carbon rods. If a carbon electrode is inserted in the. plunger 17 the stop 44 is removed and the supply connected to terminals 42, 43. The plunger may also be used as a pressure medium upon or as a conducting bridge between two parts of a body mounted insulatingly on the base plate 1 in which case the terminals 41, 43 are connected respectively by flexible cables with the two parts to be soldered. The base plate has grooves 46 for fixing work clamps therein. Specification 546,695 is referred to.