| 摘要 |
An electromagnetic warning instrument has a housing equipped with at least one core carrying an operating electric coil, and a contact-breaker cooperating with a vibrating armature fast with a diaphragm. The coil is mounted on a printed circuit and electrically connected thereto. The printed circuit is mechanically fixed to the housing. The contact-breaker is mounted on the circuit by a mechanical connection which effects an electric connection. The printed circuit carrying the coil or coils can be assembled in advance, preferably by automatic means, then it is fixed on the housing, each coil being simply fitted on to the core. The fixing of the contact-breaker assembly then simultaneously ensures a supplementary mechanical connection for the printed circuit and the electric connection with the contact breaker.
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