JPS6312398Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a horn installed in automobiles, etc., and particularly relates to the structure of the portion where the diaphragm is attached to the body.

Conventionally, for example, as shown in FIG. 1, a ring-shaped cover 3 is bent and clamped between a circumferential edge 1a of a substantially cup-shaped body 1 and a circumferential edge 2a of a disc-shaped diaphragm 2. A horn having a diaphragm 2 attached to an opening is known.

However, in the above-mentioned conventional horn, the entire circumference of the diaphragm 2 is connected to the body 1 by the cover 3.
Since the diaphragm 2 is clamped and fixed to the periphery of the diaphragm 2, the degree of freedom of deformation of the diaphragm 2 is reduced, the blowing frequency range is narrowed and the sound pressure is reduced, and furthermore, the diaphragm 2 is prone to cracking due to the stress generated due to vibration. There were flaws.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and includes forming pressing parts that press the diaphragm at equal intervals on the cover, and using the pressing parts to press the periphery of the diaphragm against the periphery of the body. The diaphragm is firmly clamped, and the periphery of the diaphragm is clamped to the periphery of the body 1 in a state close to the free end in parts other than the pressing part.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 2 to 4.

In the figure, reference numeral 1 denotes a substantially cup-shaped body, and a known electromagnetic coil and an interrupter (not shown) for cutting off and cutting off the current of the electromagnetic coil are housed inside the body 1. Reference numeral 2 denotes a disc-shaped diaphragm disposed in the opening of the body 1. 3
is a substantially ring-shaped cover, and by bending the cover 3, the periphery 1 of the opening of the body 1 is
a and the peripheral edge 2a of the diaphragm 2 are clamped together. 3a are substantially planar pressing parts formed at equal intervals on the surface of the cover 3 in contact with the diaphragm 2, and a convex part 3 having a hollow part 4 is provided between the pressing parts 3a.
b is formed. For this reason, diaphragm 2
The peripheral edge 2a of the cover 3 is firmly clamped to the peripheral edge 1a of the body 1 at the part that comes into contact with the pressing part 3a of the cover 3,
Only the tip of the peripheral edge 2a is clamped at the portion that comes into contact with the convex portion 3b. Note that the pressing part 3a of the cover 3
The tip portion 3c is inclined in a direction away from the diaphragm 2 to prevent interference with the diaphragm 2. Reference numeral 5 indicates a resonance disk disposed at a slight distance from the diaphragm 2, and 6 an armature fixed to the center of the diaphragm 2 and the disk 5.

Therefore, when the alarm configured as described above is activated, the diaphragm 2 presses against the pressing portion 3a of the cover 3.
The part that contacts the convex part 3b is fixed to the peripheral edge 1a of the body 1, and the part that contacts the convex part 3b vibrates in a state close to the free end. Therefore, the degree of freedom of deformation of the diaphragm 2 is large, and it is possible to blow in a wide frequency range and obtain a large sound pressure.

Although the embodiment shown in FIGS. 2 to 4 has been described above, it is also possible to form a notch 3b' between the pressing parts 3a of the cover 3, as shown in FIG. 5, for example. Further, as shown in FIG. 5, it is also possible to make a design change such as arranging ring-shaped gaskets 7 and 8 made of paper material on both sides of the peripheral edge 2a of the diaphragm 2.

As is clear from the above description, in the horn of the present invention, pressing parts are formed at equal intervals on the ring-shaped cover to press the periphery of the diaphragm, and the pressing parts press the periphery of the diaphragm. The diaphragm is firmly attached to the periphery of the body, and only the tip of the periphery of the diaphragm is attached to the periphery of the body in a state close to the free end in parts other than the pressing part, so the diaphragm can be freely deformed. It has a large frequency and can be blown in a wide frequency range, and has the effect of increasing the sound pressure. Furthermore,
In the horn according to the present invention, since the diaphragm has a large degree of freedom in deformation, the diaphragm does not break due to stress caused by vibration, and has excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a conventional example. Second
Figures 4 to 4 are views showing an embodiment of the present invention, with Figure 2 being a plan view thereof, and Figures 3 and 4 being enlargements of the main parts of section A-A and section B-B in Figure 2, respectively. FIG. 5 and 6 are diagrams showing other embodiments of the present invention. Explanation of symbols, 1...Body, 2...Diaphragm, 1a, 2a...Periphery, 3...Cover, 3a
...pressing part, 3b...convex part, 3c...tip part, 3
b'...Notch, 4...Hollow part, 5...Disc, 6
... Armature.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A warning horn in which a diaphragm 2 is disposed in an opening of a body 1, and a circumferential edge 1a of the body 1 and a circumferential edge 2a of the diaphragm 2 are clamped by a cover 3, A plurality of pressing portions 3a are formed at equal intervals on the surface that contacts the diaphragm 2, and the pressing portions are used to clamp and fix the diaphragm 2 to the peripheral edge 2a and the peripheral edge 1a of the body 1. In the parts other than 3a, only the tip of the peripheral edge 2a of the diaphragm 2 is clamped to the peripheral edge 1a of the body 1.
Alarm bell. 2. The horn according to claim 1, characterized in that a convex portion 3b having a hollow portion 4 is formed between the pressing portions 3a of the cover 3. 3. The horn according to claim 1, characterized in that a notch 3b' is formed between the pressing portions 3a of the cover 3. 4. The horn according to claim 1, characterized in that a gasket 7 and a gasket 8 are disposed on both sides of the peripheral edge 2a of the diaphragm 2.