Title: Vehicular sound generator

Abstract: A vehicular warning device comprises a sound generator of electromagnetic electropneumatic type with two components, one of them including a diaphragm, that are relatively axially movable in a generally cylindrical housing supporting both components. The peripheral housing wall has a corrugated zone forming at least one annular bulge which can be compressed between a pair of clamping jaws during tests following assembly. Such compression, with permanent deformation of the housing wall, reduces the axial height of the housing so as to narrow the air gap between a membrane-supported electromagnetic armature and a confronting core member or to intensify the pressure exerted by the diaphragm upon an entrance end of an air channel normally blocked by that membrane.

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Inventors: Frigo, Domenico (Olmo (Vicenza), IT)

Application Number: 807331
Filing Date: 1977-06-16
Publication_date: 1979-01-23
Assignee: F.I.A.M.M. S.p.A. - Fabbrica Italiana Accumulatori Motocarri Montecchio (Montecchio Maggiore (Vicenza), IT)
Primary Class(es): 340/391.1 29/445, 29/594, 116/142R
Other Classes:
US Patent Ref:

1351729	Sep, 1920	Ames	340/388.
1789947	Jan, 1931	Scofield et al.	340/388.
1797120	Mar, 1931	Bennett	340/388.
1841535	Jan, 1932	Hueber et al.	340/404.
1898394	Feb, 1933	Riedel	340/388.
2694806	Nov, 1954	Johnson	340/404.
2811129	Oct, 1957	Buell	116/124.
3412219	Nov, 1968	Karay	29/594.
3477405	Nov, 1969	Jensen	116/137.
3967367	Jul, 1976	Hayes et al.	29/594.

Other Refs: 205425211915121236553

May, 1972	DE
Oct, 1959	FR
Jun, 1960	FR

Primary Examiner: Yasich, Daniel M.
Assistant Examiner:
Attorney: Ross; Karl F.