| 摘要 |
<p>1. An electric soldering iron, of the type comprising an insulating handle (9) provided at one end with flexible electrical power cables (90) and extended at its other end by a metal shield (3; 6) housing a heater body (2; 5), and suitable for receiving a soldering bit (10, 40) at its tip (1; 4), in which the heater body (2, 5) comprises a central insulating tube forming a support for a heating resistance (R) in the form of a coiled fine wire, and insulating tube (21, 51) forming a shell housed between the central tube and the outer cylindrical shield (23, 53) while an insulating sleeve tube (30; 60) is housed inside said shield (3; 6) between the inside (8) of the handle and the heater body (2; 5), and two connection wires (31, 32; 61, 62) called "ligatures" run from connectors (91, 92) situated in the handle and extend inside sheaths inside the insulating sleeve tube (30; 60) in order to meet respective ones of the two ends of the coiled wire resistance (R), the shell tube (21, 51) receiving at least one insulating part (30; 50; 60) penetrating axially therein, which part is substantially circularly symmetrical, has the ligatures (31, 32; 61, 62) running along its center, and projects axially beyond the furthest downstream conducting point (CA) of the resistance or the ligature (31) connected downstream therefrom, the soldering iron being characterized in that the shell tube (21, 51) is cylindrical with constant right section, in that said axial penetration takes place over a length such that the shortest distance between each of the ligatures (31, 32; 61, 62) and the outer metal shield (3, 6) measured as a broken line through air along said insulating part is not less than 9.5 mm, and in that said shell tube projects axially beyond said furthest downstream point by not less than 9.5 mm, thereby making it possible to obtain a high-insulation soldering iron.</p> |
