Communications: electrical – Audible indication
Patent
1993-08-02
1995-10-10
Crosland, Donnie L.
Communications: electrical
Audible indication
3403881, 3403887, 3403932, 3403982, 3403973, 116137R, G08B 300
Patent
active
054574374
ABSTRACT:
An electric horn which comprises a diaphragm held at its peripheral portion in a housing of the horn and having an armature attached to a middle portion thereof; an electromagnet having a coil and disposed adjacent to the armature in an opposed relationship with each other for causing the armature to move down under an action of a magnetic field produced by an energizing current flowing through said coil; an interrupter having a pair of normally-closed contacts including a fixed contact and a movable contact and connected at one contact to a DC power source; a horn actuating switch connected serially in circuit with the interrupter; and a sparking free circuit including at least one electronic triggering switching means connected to the coil, for interrupting the energizing current supply to the coil of the electromagnet; the normally-closed interrupter located near the armature and connected to a control input of the triggering switching means, for turning ON and OFF the triggering switching means, the movable contact engaging the armature so as to open the interrupter by the downward movement of the armature; a current limiting means connected serially with the interrupter. A capacitor is connected in parallel with the horn actuating switch for enabling the turning ON and OFF cycle of the triggering switching means to be repeated in a given period of time during which the electric current flowing through the coil of the electromagnet is gradually reduced in its level.
REFERENCES:
patent: 3931549 (1976-01-01), Berns et al.
patent: 3945004 (1976-03-01), Myers
patent: 4139842 (1979-02-01), Fujita et al.
patent: 4199752 (1980-04-01), Lucas et al.
Crosland Donnie L.
Kohli Vineet
Mando Machinery Corporation
Morrison Thomas R.
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