| 摘要 |
1,172,118. Electromagnetic switches; electromagnets. GES. ZUR FÍRDERUNG DER FORSCHUNG AN DER EIDGENÍSSISCHEN TECHNISCHEN HOCHSCHULE. 3 Nov., 1967 [15 Nov., 1966], No. 50172/67. Headings H1N and H1P. An electromagnetic snap-action mechanism which may be used in a relay, indicator or display device has a bowed blade mounted in a magnet field so that when an electric current is passed through or along the blade it is urged to one of its two extreme positions. In Figs. 1 and 2 the blade 3 is supported at its ends in clamps 2 and passes through the air-gap 6a of permanent magnet system 4. The clamps 2 may be angled (Figs. 3 and 4, not shown) to provide only one stable position. The blade 3 may move, in the latter part of its travel in each direction a respective prong of a fork which actuates contacts or engage a pair of contact pins in one position (Figs. 6 and 7, not shown). The blade may have a polished surface to reflect light in different directions in each extreme position (Fig. 5, not shown). One or both ends or the centre of the blade may act on a rotatable shaft (Figs. 8 to 16, not shown) which may drive ratchet-and-pawl mechanism. One end of the blade may move longutidinally against a biasspring to momentarily operate contacts. In Fig. 19 (not shown), two blades in opposite fields carry turns of a common coil. |
