Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent
1975-02-11
1977-01-25
Caldwell, John W.
Communications: electrical
Audible indication
Pneumatic-type sound producer
340401, 335 96, 29593, 335278, 29602R, G01K 108, G08B 300
Patent
active
040054136
ABSTRACT:
A buzzer structure, of the type comprising a housing having a coil unit therein and an armature mounted for vibratory movement adjacent the coil unit, includes in one embodiment an integral portion of the housing which is bent inwardly into engagement with the coil unit to fix the spacing between the coil unit and housing, thereby to determine the dimensions of the gap between the coil unit and armature. In a further embodiment, the coil unit is mounted directly to a deformable, integral part of the housing which is bent inwardly to fix the spacing between the coil unit and an adjacent diaphragm. The spacing and gap dimensions are adjusted, after the buzzer elements are assembled, by energizing the coil unit, applying a force to a portion of the housing to progressively deform it to displace the coil unit in engagement therewith, and monitoring the magnitude of current flow through the coil unit while simultaneously monitoring the sound output of the buzzer to determine when a proper operating point has been reached, at which time the progressive deformation of the housing and displacement of the coil unit are immediately terminated.
REFERENCES:
patent: 3631480 (1971-12-01), Heap
patent: 3864823 (1974-01-01), Berns
Caldwell John W.
General Signal Corporation
Wannisky William M.
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