JPH0447758Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an electric horn installed in automobiles, etc., and in particular relates to an electric horn equipped with a vent with a water-proof structure. It is something.

(B) Conventional technology As shown in FIG. 1, for example, a conventional electric alarm has a vent hole c provided near the rim of the opening of the housing a and the diaphragm b. Alternatively, as in Japanese Utility Model Publication No. 57-55679, a labyrinth-type ventilation passage is formed by a cutout provided at the peripheral edge of the diaphragm and a cavity in the housing.

(c) Problems to be solved by the invention The vent hole of the electric horn shown in Figure 1 has a simple structure and processing, and is effective in discharging water droplets that have condensed inside the horn. Although this system is excellent, when it is installed in a car, there is a risk that splashed rainwater may enter the interior through the ventilation holes, causing problems such as damaging the contacts of the current interrupter.

In addition, as in Utility Model Publication No. 57-55679, in which a ventilation passage is formed by a combination of a cut-out part of the diaphragm and a hollow part of the housing, it is possible to prevent scattered rainwater from entering the interior through the ventilation passage. Although it is possible to do so, it is time-consuming to process and assemble, and the ventilation path is a labyrinth type.
There was a problem in that it was difficult to drain the water droplets that had condensed inside the horn due to the surface tension of the water.

(d) Means for solving the problem A punched out part and a cutting opening are provided in the collar on the peripheral edge of the housing. It is characterized by a structure in which a shielding surface is provided using a step, and a ventilation hole leading to the inside of the horn is formed by bending the shielding surface from the cut opening through the cavity.

(E) Function Air flows in and out through the ventilation holes, and the blowing operation is performed in a stable state. In addition, water droplets that have condensed inside can be easily drained out through a simple vent hole. When scattered rainwater enters the ventilation hole, it hits the shielding surface and prevents it from entering the inside of the horn, and the shielding surface also prevents the rainwater adhering to the ventilation hole from flowing into the inside of the horn. It is prevented from doing so.

(f) Embodiment First, the overall configuration will be explained with reference to FIG. 4. Reference numeral 1 is a roughly cup-shaped housing, and the opening of the housing 1 has a ring-shaped periphery of a disc-shaped diaphragm 2. It is fixed by a caulking member 3. A shaft portion 4a of an armature 4 is fixed to the center of the diaphragm 2 together with a disc-shaped lasernator. Further, inside the housing 1, an electromagnetic coil (not shown) and a current interrupter that interrupts the current flowing through the electromagnetic coil are arranged. When the terminal 6 is connected to a DC power source, an intermittent current flows through the electromagnetic coil to generate magnetic force, and in response to this, the armature 4, diaphragm 2, and lasernator 5 vibrate and sound, producing an alarm sound. It's summery. 7
numeral 8 is a bracket for fixing the horn to the body of an automobile, and numeral 8 is a vent hole formed at the periphery of the opening of the housing 1.

Next, referring to FIGS. 2 and 3, the ventilation hole 8
The detailed structure of is explained below. The collar 11 formed at the opening of the housing 1 has a convex embossed part 12.
and a cutting opening 13 are integrally provided. In addition, the rising portion 14 and the flange portion 11 of the housing 1
A shielding surface 15 is formed integrally with the cavity 12a at a position where the two substantially intersect with each other, using the plate thickness of the housing 1 and the step of the protruding portion. That is, the ventilation hole 8 communicates with the inside of the horn via the cutting opening 13, the cavity 12a, and the narrowing part 16 between the end 15a of the shielding surface 15 and the diaphragm 2,
It is a short passage with a bend approximately corresponding to the plate thickness of the flange portion 11. Reference numerals 17 and 18 indicate ring-shaped gaskets disposed on both sides of the periphery of the diaphragm 2.

(g) Effects of the device In the electric alarm system configured as described above, even if rainwater that has been scattered through the path shown by H in FIG. Entry into the inside of the sound device is prevented. Furthermore, even if rainwater adhering to the ventilation hole 8 is sucked into the interior when the alarm is activated, the passage is bent by the shielding surface 15, and the narrow portion 16 is further provided.
The rainwater that is sucked in does not scatter deep into the interior,
It will not damage the current interrupter contacts. Furthermore,
A ventilation hole 8 having a cut opening 13 and a shielding surface 15 that utilizes a step in the thickness direction of the housing 1 can be easily and integrally formed in the flange 11 of the housing 1 by stamping. The pores 8 are easily formed and are short passages bent by approximately the thickness of the flange 11, and are excellent in draining rainwater that has entered and water droplets that have condensed inside.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of main parts showing a conventional example.
Figures 2 to 4 are diagrams showing an embodiment of the present invention, with Figure 2 being an enlarged cross-sectional view of the main parts, Figure 3 being a Z view of Figure 2, and Figure 4 being an electric warning sound. It is a side view showing the whole vessel. Explanation of symbols, 1...Housing, 11...Brim part, 12...Protrusion part, 12a...Cavity part, 13
... Cutting opening, 14 ... Rise portion, 15 ... Shielding surface, 16 ... Constriction portion.

Claims (1)

[Claims for Utility Model Registration] 1. A substantially cup-shaped housing in which an electromagnetic coil and a current interrupter are disposed, a diaphragm to which an armature is fixed, and a flange formed around the opening of the housing. In an electric alarm device in which the periphery of the diaphragm is fixed to the housing, a protruding part and a cutting opening that protrude away from the diaphragm are integrally formed in the brim part of the housing, and a cutting opening is integrally formed inside the protruding part. A cavity is formed, and a shielding surface is formed inside the cavity using the plate thickness of the housing and the step of the stamped part, and the wire is bent at the shielding surface from the cutting opening through the cavity. An electric alarm system that features a configuration with a ventilation hole. 2. The electric horn according to claim 1 of the utility model registration, characterized in that the ventilation hole is bent by an amount corresponding to approximately the thickness of the housing in the shielding surface portion. 3. The scope of the claim for registration of a utility model, characterized in that the shielding surface is formed larger than the projected area of the cutting opening, and a narrowing portion is provided between the diaphragm-side tip of the shielding surface and the diaphragm. The electric alarm according to paragraph 1.