Acoustic warning device, particularly for motor vehicles

Details Acoustic warning device, particularly for motor vehicles Acoustic warning device, particularly for motor vehicles

1997-04-07

1998-06-02

Hofsass, Jeffery

Communications: electrical

Audible indication

3403881, 340388, 3403841, G08B 300

Patent

active

057606790

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to acoustic warning devices, particularly for motor vehicles, of the kind defined in the introduction of claim 1.
An acoustic warning device of this kind is disclosed in WO093/01588. In this prior acoustic warning device, the circuit breaker is disposed in a closed chamber defined between a diaphragm and the housing.
U.S. Pat. No. 4,540,975 discloses an electromagnetic horn including a diaphragm coupled to the movable core of an electromagnet and a circuit breaker for interrupting the current supply to the winding of the electromagnet. The circuit breaker is also in this case disposed in a closed region comprised between the diaphragm and the horn housing.
The invention aims at providing an improved warning device of the above-specified kind.
This object is achieved according to the invention by an acoustic warning device having the features defined in claim 1.
Further characteristics and advantages of the invention will become clear from the following detailed description given with reference to the appended drawings, provided purely by way of non-limiting example, in which:
FIG. 1 is a perspective view of an acoustic warning device according to the invention,
FIG. 2 is a sectional view according to line II--II of FIG. 1,
FIG. 3 is a partially sectioned, side elevation view, showing in an enlarged scale part of the acoustic warning device represented in FIG. 2, and
FIG. 4 is a sectioned view similar to that represented in FIG. 2, showing a variant or second embodiment of an acoustic warning device according to the invention.
Referring to the drawings, and specifically to FIGS. 1 and 2, an acoustic warning signal for motor vehicles according to the invention comprises a support casing, generally indicated 1. The casing 1 is made for example of a plastic material.
In the embodiment shown by way of example, the casing 1 essentially comprises an upper portion 2 and a lower portion or body 3, which are bonded with each other, for example by means of a hot-plate device, in a plane 4 (FIG. 2).
The upper portion 2 of the casing 1 is closed by a cover 5 whereas the lower portion 3 is closed at the bottom by a cover 6. Also said cover or closure members 5 and 6 are convenientlv made of a plastic material and can be bonded by ultrasonic welding (or other per se known methods) to the respective portions 2 and 3 of the casing 1.
As can be seen in FIG. 2, in the axial central portion of the casing 1 there is defined an essentially cylindrical passage 7 in which there are mounted two movable members 8 and 9 of ferromagnetic material, axially facing and aligned with each other.
The opposite ends of said members 8, 9 are connected to the central portions of two resilient membranes or diaphragms 10 and 11, made for example of a metal material, whose respective peripheral portions are clamped in the opposite end portions of the casing 1.
The axial terminal portions of members 8 and 9, facing each other and indicated 8a and 9a respectively, are shaped substantially in the form of bells.
In FIG. 2 at 12 there is indicated a stationary ferromagnetic member, substantially shaped as a disk, which is transversely fixed in the passage 7 of the casing 1 between the bell-shaped portions 8a and 9a of the movable members 8 and 9.
The periphery of said stationary ferromagnetic member 12 is separated from the end edaes of said movable elements 8, 9 by respective air gaps 13 and 14.
As can be more clearly seen in FIG. 3, two fixed cores 15, 16, made of ferromacnetic material, are connected to the central portions of the opposite faces of the stationary ferromagnetic member 12. Said fixed cores 15, 16 can be formed as separate elements, or integral with the disk-shaped member 12.
Around the fixed cores 15 and 16 there are provided respective spools 17 and 18 of an electrically insulating material, which are for example overmolded onto said cores 15 and 16. Said spools 17, 18 carry respective excitation windings, indicated 19 and 20.
The opposite ends of the fixed cores 15 and 16 are separated from the associa

REFERENCES:
patent: 1351729 (1920-09-01), Ames
patent: 1789947 (1931-01-01), Scofield et al.
patent: 3179932 (1965-04-01), Gregoroff et al.
patent: 4241334 (1980-12-01), Shintaku
patent: 4540975 (1985-09-01), Kobayashi
patent: 5420563 (1995-05-01), Frigo

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