| 摘要 |
<p>Portable weldings tongs for high frequency welding of plastic sheets including an actuating mechanism for manually opening the tongs against the action of springs clamping the electrodes. According to the invention, the hinge pin (104) of the upper arm (103) is arranged in the region of the main body (101) proximal end, to the rear of a grip (112) mounted under said body. The actuating mechanism (120) also comprises a manoeuvring lever (121) hinged about the main body (101) and an adjustable mechanical force reducing transmission unit which links the lever to a supporting means (129) carried by the upper arm (103).</p> |
