JPS61166597A - Electric type horn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electric horn, and more particularly to an improvement in an adjustment screw for adjusting the disconnection position of an interrupter of an electric horn used by being attached to a vehicle. be.

[Conventional technology]

Fig. 2 is a vertical cross-sectional view showing the overall structure of a conventional electric horn, in which an electromagnetic coil 2 is fixed inside the horn body, and a movable contact plate 3a of a circuit breaker connected in series to this coil is fixed. A diaphragm 4 which has a contact plate 3b in constant contact and whose outer periphery is fixed to the large-diameter flange portion of the horn body l, and the electromagnetic coil 2 which is fixed to the center of this diaphragm.
It has a movable iron core 5 that is brought close to.

When energized, the electromagnetic coil 2 is excited, and the movable core 5 is attracted and moved by the attractive force of the fixed core 6. During the movement, the insulating plate 7 fixed to the movable core pushes the movable contact plate 3a, and the fixed contact plate 3b, the current of the electromagnetic coil 2 is cut off, and the diaphragm 4 having spring characteristics is restored to its original position or higher. At this time, the movable contact plate 3a also returns to its original position due to the restoring force of the spring, and this is rapidly repeated in a self-excited manner, thereby emitting a warning sound.

The interrupter in the above-mentioned conventionally known electric horn is operated by pushing the free end of the fixed contact plate 3b through the insulating plate 8 and changing the disconnection position to reduce the sound pressure, which is a characteristic of the horn.
The horn body 1 has an adjustment screw 9 for adjusting current, etc., and a female screw hole for the adjustment screw is bored in the horn body 1, and the horn body 1 is fixed with a nut 10. A indicates the adjustment screw portion. In the conventional case as described above, after the characteristics of the horn are adjusted with the adjustment screw 9, when the adjustment screw is fixed to the horn body with a nut, the tip position of the adjustment screw and the discontinuation position are changed due to deformation near the female screw of the horn body. may change, and the characteristics of the horn may change. If the nut 10 is not used to fix the horn, the vibration of the entire horn when the horn alarm sound is generated and the pressure of the fixed contact plate 3b on the adjustment screw push the adjustment screw back, and the characteristics change accordingly.

Therefore, as shown in Figure 3 (a) and (b), we use a tuffing screw whose axially projected shape of the screw thread of the adjustment screw is a polygon, and screw the adjustment screw at the same time as drilling the female screw hole in the horn body. There is a known embodiment in which the elastic force in the direction perpendicular to the axis remaining in the material on the female thread side is used as a fixing force for the adjusting screw, and no nut is used. In the case of the above-mentioned polygonal tapping screw, the top of the screw thread not only undergoes plastic processing of the female threaded hole, but also undergoes some cutting processing.
As the amount of screwing in during knopping and the amount of screwing in for horn characteristic adjustment increases, the fixing force decreases and may even reach below the required fixing force.

[Problem that the invention seeks to solve]

As mentioned above, when the adjustment screw 9 is fixed to the horn body with the groove 10, the tip position and the intermittent position of the adjustment screw change due to deformation of the vicinity of the female screw of the horn body, and the characteristics of the horn change. There is a problem with this.

In addition, when the nut 10 is not used and a tufting screw is used in which the axially projected shape of the thread of the adjustment screw is polygonal, the top of the thread not only performs plastic processing of the female screw hole, but also Since some cutting work is also performed, there is a problem in that the fixing force decreases as the screw-in amount during tapping and the screw-in amount for horn characteristic adjustment increases, and may even reach below the required fixing force.

[Means for solving problems]

As the adjustment screw, use an adjustment screw in which the axially projected shape of the screw thread does not have a vertex, has a continuous thread, and which plastically processes the female threaded hole by screwing the adjustment screw into the horn body. .

[For production]

Since cutting is not performed at the top of the thread of the adjustment screw, sufficient fixing force is maintained, the horn characteristics can be easily adjusted, and the characteristics of the horn do not change.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described. 1st
Figure (a) is a cross-sectional view of a main part showing the configuration of an embodiment of the adjustment screw part of an electric horn according to the present invention, and Figure 1(a) is a cross-sectional view taken along the line C-C shown in Figure 1(a). The adjustment screw 9
The axial projection shape of the screw thread is as shown in Fig. 1 (mountain).
It does not have an apex and has a continuous thread, and the female screw hole is plastically worked by screwing an adjustment screw into the horn body 1.

The rest of the structure is the same as that of the conventional electric horn shown in FIG.

In addition, when the above-mentioned adjustment screw is, for example, a JISB1115 slotted tapping screw type 3 type, the screw fixing force is determined by the number of screw rotations, with the point at which the effective threaded portion is completely pulled out from the horn body as the zero point. An example of the change in screw rotation starting torque is shown in the characteristic diagram of Fig. 4, comparing it with the case where the conventional hexagonal screw is used. , and Y are the characteristics when a conventional hexagonal screw is used.According to the present invention, sufficient fixing force can be maintained despite an increase in the number of screw rotations.

〔Effect of the invention〕

The electric horn according to the present invention eliminates the need for cutting at the top of the thread of the adjustment screw, maintains sufficient fixing force despite the increased number of screw rotations, and facilitates the adjustment work of the horn characteristics. This has the great effect of simultaneously eliminating the need for female threaded holes in the horn body and eliminating the NAND.

[Brief explanation of the drawing]

Figure 1 (al is a sectional view of the main part showing the configuration of one embodiment of the electric horn adjustment screw according to the present invention, in Figure 1) A cross-sectional view, FIG. 2 is a vertical cross-sectional view showing the overall structure of a conventional electric horn, and FIG.
) is a sectional view of the main part of the adjustment screw part when a conventional hexagonal screw is used as the adjustment screw, and Figure 3 (bl is Figure 3 (a)
FIG. 3 is a cross-sectional view taken along the illustrated line BB. 1... Horn body, 2... Electromagnetic coil, 3a...
Movable contact plate, 3b... fixed contact plate, 8... insulating plate,
9...adjustment screw, 10...nut.

Claims (1)

[Claims] It has an adjustment screw whose axial projection shape is continuous without having a vertex, and which adjusts the intermittent position of the interrupter that interrupts the supply of electricity to the electromagnetic coil, and the adjustment screw has a female thread for the adjustment screw. An electric horn characterized by having a horn body having holes formed by plastic processing.