| 摘要 |
<p>A moving coil instrument with a unique base of nonmagnetic sheet metal construction so arranged that sides of the base can flex to receive and clampingly retain a magnetic circuit, without causing movement of end portions of the base which support the moving coil for pivotal movement. Projections of a casing cooperate with circular mounting ears on the sides of the base to exert an inward force to assist the clamping action of the sides to securely hold the magnetic circuit against movement. A unique unitary sheet metal balance cross and a terminal plate assembly provide for connecting inner ends of taut bands which support the coil for movement. Cooperating tabs and slots on the coil, balance cross, and terminal assembly provide for securing the terminal plate and balance cross at opposite ends of the coil in predetermined locations with respect to the coil. A unique stop arrangement including tab means integral with the balance cross, and a hub cooperate to limit transverse displacement of the coil as a result of shock and vibration, to prevent damage to the delicate taut bands which support the coil for pivotal movement. The overall arrangement provides for rapid assembly without danger of substantial inaccuracy of the assembled instrument as a result of accumulation of tolerances.</p> |
