Electromagnetic horn

Details Electromagnetic horn Electromagnetic horn

1981-03-13

1983-08-09

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Diaphragm

340391, 340402, G08B 310

Patent

active

043981828

ABSTRACT:
An electromagnetic horn has a diaphragm, tone disc, spacer and mass which are clamped together between an abutment shoulder and an annular rib on an internally screw-threaded sleeve, the annular rib being produced by deformation of the sleeve after the aforesaid parts have been mounted on the latter. A screw-threaded rod extending from the armature is engaged in the sleeve. Tuning of the horn can be effected by rotation of the rod without the need either to release and then retighten any locknuts or to deform the body. For ease of assembly of a contact breaker assembly into the horn body, a first arm carrying a first contact is mounted at one of its ends in the body. A second arm carrying a second contact is mounted on the first arm but is electrically insulated therefrom. The second arm has an extension abutting a contact stud fixed in the body. An adjuster is engaged with the other end of the first arm. The second arm can be assembled on the first arm before securing of the assembly in the body.

REFERENCES:
patent: 1789947 (1931-01-01), Scofield et al.
patent: 3886546 (1975-05-01), Ueda
patent: 4116158 (1978-09-01), Warnod

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