Alarm buzzer

Details Alarm buzzer Alarm buzzer

1979-06-11

1983-02-15

Pitts, Harold I.

Communications: electrical

Audible indication

Diaphragm

340384, 340392, G10K 100

Patent

active

RE0311529

ABSTRACT:
An alarm buzzer comprising an electromagnet, a yoke on which said electromagnet is mounted while maintaining insulation from the housing, an armature which is held with a plate spring on said yoke and is attracted by said electromagnet, a vibratory plate which contacts said armature, and a housing which incorporates the above components, wherein the bobbin of said electromagnet is made of an insulating material and consists of a hollow cylinder which receives an iron core in it and is wrapped with coil on its outer periphery, first flange provided on one end of said hollow cylinder, second flange provided on the other end of the hollow cylinder and at least one hollow projection provided on said second flange in the direction parting from said first flange, said yoke is provided with at least one hole into which said hollow projection of the bobbin is inserted, and the bobbin and the yoke are fixed to the housing of the alarm buzzer by a fixture which is inserted into the hollow projection of the bobbin inserted into said hole of the yoke.

REFERENCES:
patent: 3974499 (1976-08-01), Shigemori
patent: 4075626 (1978-02-01), Sakaguchi
patent: 4097861 (1978-06-01), Pariza

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