| 摘要 |
<p>The invention is concerned with an automatically operated double-break switch. The spring member (1) building up the contact pressure is positioned between a pressure piece (2) and a bridge contact (3). The bridge contact (3) moves linearly, one spring being applied which engages with the centre of the bridge contact. Only small contact pressures are built up and as a result of displacements of the moving contacts different contact pressures develop as a result of which irregular and more rapid contact wear can occur or the contact can be seized by combustion. According to the invention the spring member consists of two springs (1) positioned at the same distance in relation to the centre of the bridge contact and the centre of the pressure piece. The axial distance of the two springs is equal to or smaller than the axial distance of the contact points and the bridge contact or the pressure piece are provided with cams (10) so that when switching on and off, respectively, the bridge contact overturns about its longitudinal axis.</p> |
