JP4398418B2 - whistle - Google Patents

Description

  The present invention relates to a whistle, and more particularly to a whistle suitable for seeking help in an emergency.

Generally, a whistle emits sound by blowing air from an air supply port through an air supply passage and blowing it from the exhaust port while hitting the edge of the exhaust port. As one of the conventional typical whistles, for example, as disclosed in FIG. 2 of Patent Document 1, a substantially flat air supply passage is formed in the mouthpiece, and the resonance is connected to the air supply passage. Some of the chambers have an air outlet formed in one wall portion. Such a typical shape of the whistle is usually formed so that the height of the air supply passage is around 3 mm. In many cases, the height of the air supply passage is constant.
However, such a conventional whistle requires a large amount of air before sound is produced because the height of the air supply passage is large. In other words, the sound comes out only when strong air is blown from the air supply port.

  By the way, in recent years when disasters such as earthquakes and floods have become prominent, the use of whistles has been attracting attention when seeking relief from a collapsed building as the awareness of disaster prevention increases. However, since the general shape whistle requires a strong blow, there is a problem that it cannot produce a sufficient sound to a person with weak blowing power such as an elderly person.

  Due to such problems, whistles have been known in the past in which the height of the air supply passage is small, for example, the height of the air supply passage is constant at 1 mm so that sound can be produced even with a weak force.

  However, if the height of the air supply passage is constant at 1 mm, there is a problem that no sound is produced when the air supply passage is blown strongly. In other words, there is a problem that when the air is sought after for help because of the upset in a disaster, the air does not flow smoothly through the air supply passage and the sound does not sound well.

On the other hand, the whistle used to seek help is preferably high and produces a loud sound. This is because such a sound can reach far and is easily discovered by rescue teams by using the whistle.
In this regard, the whistle described in Patent Document 1 produces a sound with a frequency of about 3.0 to 3.5 kHz as an intense peak. Similarly, a whistle having a conventional air supply passage having a height of 1 mm generates a sound having an intensity peak at a frequency of about 3 kHz.

JP-A-9-212171 (FIGS. 1 and 2)

This invention is made | formed in view of the above backgrounds, and makes it a subject to provide a suitable whistle which can be used properly according to a use condition and is suitable for seeking help in an emergency.

In order to solve the above problems, a whistle of the present invention includes a resonance chamber, a main body having an exhaust port communicating with the resonance chamber and the outside, a mouthpiece having a substantially flat air supply passage for feeding air into the resonance chamber, A height of an outlet connected to the resonance chamber is 0.3 to 1.0 mm, and a height of the inlet is 0.8 to 3.5 mm. One or both of an upper wall and a lower wall forming the air supply passage are configured to be movable, and the inclination of the air supply passage is variable . The height of the inlet is desirably 1.0 to 3.0 mm.

In such a whistle, since the height of the outlet portion of the air supply passage is made as small as 0.3 to 1.0 mm, an air flow having a sufficient flow velocity is generated even when blown with a weak force, and a sound is produced. be able to. When you want to make a loud noise and ask for help, increase the inclination from the inlet to the outlet of the air supply passage wall (inclination of the air supply passage), and loosen the inclination of the air supply passage wall during normal use. Or by adjusting the volume and tone by making the upper and lower walls parallel to each other, it is possible to use them according to the situation of use.

The whistle preferably has a shape that gradually narrows from the inlet toward the outlet . In such a configuration, even when blowing with a strong force, the air smoothly flows through the air supply passage because the inlet side is wider than the outlet side, and air is sent from the outlet of the air supply passage to the resonance chamber at a high flow rate. be able to. As a result, the whistle is extremely loud and generates a high sound, and if the user uses the whistle for help in an emergency, the presence of the person can be informed far away.

According to the whistle of the present invention, the inclination of the walls forming the air passageway by a variable, it is possible to generate volume, sound tone according to the operating conditions. Moreover, it is hard to be influenced by the blowing force, and can generate a high and loud sound. Therefore, it can be suitably used to seek help in an emergency.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is an overall perspective view of a whistle according to an embodiment, FIG. 2 (a) is a perspective view of a movable lower wall, and FIG. FIG. 3 is a cross-sectional view taken along line X-X in FIG. 1, and (a) shows a normal use and (b) shows an emergency use.

  As shown in FIG. 1, the whistle 1 includes a main body 10 having a resonance chamber 11 and a mouthpiece 20 connected to the main body 10. The mouthpiece 20 has an air supply passage 21 having one end (inlet 22) opened to the outside and the other end (outlet 23) connected to the resonance chamber 11. The whistle 1 of the present embodiment is functionally divided into a main body 10 and a mouthpiece 20, but as parts, the upper side of the main body 10 and the mouthpiece 20 (the upper side in FIG. 1 is “upper”) is an integrated resin. One part formed by molding (referred to as “main body part 15”, see FIG. 2B) and another part constituting the lower side of the mouthpiece 20 (referred to as “movable lower wall 25”). (See (a)). Such a way of dividing the parts is not particularly important in the present invention, and can be composed of an appropriate number of parts. The material constituting the whistle 1 can be arbitrarily selected from metals, ceramics, wood and the like in addition to the resin.

An exhaust port 12 for discharging air sent to the resonance chamber 11 is formed in the main body 10. An edge 12 a that generates sound when the air sent from the air supply passage 21 hits the exhaust port 12 is disposed toward the outlet 23 of the air supply passage 21.
The air supply passage 21 has a substantially flat plate shape, but the shape of the passage can be changed by operating the movable lower wall 25 as described later. The edge 12a of the exhaust port 12 has a ridge line along the flat direction of the air supply passage 21, in other words, the width direction.
A small strap hole 13 penetrating vertically is formed at the rear end (the back side in FIG. 1) of the main body 10. By connecting the whistle 1 to a key holder or a mobile phone through a string or chain through the strap hole 13, the whistle 1 can always be carried, which is effective for seeking rescue in an emergency.

  As shown in FIG. 2A, the movable lower wall 25 has a substantially wedge shape in which the front side (the front side in FIG. 2A) is narrowed. The cross-sectional shape of the movable lower wall 25 is substantially constant in the width direction. On both side walls of the movable lower wall 25, there are formed rotating shafts 25a made of cylindrical protrusions. Also, two small protrusions 25 b are provided on the upper surface of the movable lower wall 25, that is, on the lower wall 27 for the air supply passage 21. Further, on both side walls of the movable lower wall 25, small protrusions 25c are provided side by side with the rotation shaft 25a. A concave curved surface 25 d that faces the exhaust port 12 of the main body 10 is formed at the upper rear end of the movable lower wall 25. The concave curved surface 25d prevents sound disturbance by directing the air flow to the exhaust port 12 when the air in the resonance chamber 11 is exhausted from the exhaust port 12.

  On the other hand, as shown in FIG. 2 (b), the main body part 15 has a cylindrical depression corresponding to the rotation shaft 25 a of the movable lower wall 25 on the inner side wall (referred to as “inner side wall 16”). A shaft support hole 17 is formed. When the rotation shaft 25a is fitted in the shaft support hole 17, the movable lower wall 25 can rotate about the rotation shaft 25a. A guide groove 18 that is slightly shallower than the shaft support hole 17 is formed in the inner wall 16 continuously to the shaft support hole 17. The guide groove 18 functions as a guide for the rotation shaft 25 when the rotation shaft 25 a is fitted into the shaft support hole 17. Further, the protrusion 25 c formed on the side wall of the movable lower wall 25 is disposed so as to be accommodated in the guide groove 18 when the movable lower wall 25 is combined with the main body part 15.

When the main body part 15 and the movable lower wall 25 are combined in such a configuration of each part, the positional relationship shown in FIG. 3 is obtained.
During normal use, as shown in FIG. 3A, the front end (left side of FIG. 3A) of the movable lower wall 25 is raised and the inlet 22 of the air supply passage 21 is narrowed. At this time, the height of the inlet 22 of the air supply passage 21 is regulated by the protrusion 25 b coming into contact with the upper wall 26 of the air supply passage 21. For example, by setting the height of the protrusion 25b to 1.0 mm, the height H2 of the inlet 22 when the movable lower wall 25 is closed can be set to 1.0 mm.

  On the other hand, at the time of emergency use, as shown in FIG. 3B, when the movable lower wall 25 is rotated so that the front end thereof is lowered, the inlet 22 of the air supply passage 21 is expanded. At this time, the protrusion 25c of the movable lower wall 25 in the guide groove 18 abuts against the wall 18a of the guide groove 18 (the stepped portion between the inner wall 16 and the guide groove 18), so that the height of the inlet 22 is regulated. The For example, the position of the protrusion 25c can be set so that the height H2 of the inlet 22 when the movable lower wall 25 is opened is 3.0 mm.

The height H1 of the outlet 23 of the air supply passage 21 is set to 0.3 to 1.0 mm. By making it larger than 0.3 mm, the air flows sufficiently, and a high and loud sound can be produced. Moreover, by making it smaller than 1.0 mm, a high flow rate is realizable and a high and loud sound can be emitted.
The height H2 of the inlet 22 of the air supply passage 21 is set so that there is a state of 0.8 to 3.5 mm at least within the movable range of the movable lower wall 25, and more desirably 1.0 to 3. It is set so that there is a state of 0 mm. When the height H2 of the inlet 22 is larger than 0.8 mm, a sufficient amount of air can be fed into the resonance chamber 11, and when it is smaller than 3.5 mm, the turbulence of the air flow flowing through the air supply passage 21 is prevented. Thus, a stable sound can be emitted. The height H2 is desirably in the range of these heights (0.8 to 3.5 mm or 1.0 to 3.0 mm) with the movable lower wall 25 fully opened. By doing in this way, the air supply passage 21 suitable for an emergency can be ensured by a simple operation of opening the movable lower wall 25 in an emergency. Further, it is preferable that the height in the air supply passage 21 is gradually decreased with the movable lower wall 25 opened.
Note that the width of the air supply passage 21 is not so important, but if it is too small, a loud sound will not be produced, and if it is too large, it must be blown strongly. Usually, it is desirable to appropriately set the width in the range of about 5 to 15 mm according to the height of the air supply passage 21.

The operation of the whistle 1 configured as described above will be described.
During normal use, as shown in FIG. 3A, the movable lower wall 25 is closed (the front end is raised) and the projection 25b is brought into contact with the upper wall 26 of the air supply passage 21. Thereby, the air supply passage 21 has a constant height of 1.0 mm from the inlet 22 to the outlet 23, for example. Therefore, by blowing in from the inlet 22 in this state, sound can be produced even with a weak blowing force. In addition, the volume of the sound is slightly larger than that of a typical typical whistle, and the pitch of the sound is the same as before, so that it can be used for general purposes in physical education classes and club activities without being disturbed. Can be used.

In emergency use, the movable lower wall 25 is opened (lowering the front end portion) and the projection 25c is brought into contact with the wall 18a of the guide groove 18 as shown in FIG. Thereby, the height H2 of the inlet 22 of the air supply passage 21 is, for example, 3.0 mm, and the height H1 of the outlet 23 is 1.0 mm. As shown in FIGS. 3 (a) and 3 (b), if the rotation shaft 25a is arranged almost directly below the outlet 23 (downward in the vertical direction with respect to the surface of the upper wall 26), it is movable. The height of the outlet 23 of the lower wall 25 is hardly changed by the operation of the movable lower wall 25.
When breath is blown from the inlet 22 in this state, air passes through the air supply passage with a small amount of resistance, and is vigorously sent into the resonance chamber 11 from the narrowed outlet 23. Therefore, a high and loud sound is generated from the whistle 1. In addition, since the outlet 23 is throttled, sound is generated even if it is blown weakly, and even when it is blown strongly, the inlet 22 opens and the air supply passage 21 is gradually narrowed, so that the air is smooth. A loud noise is generated from the street whistle.
Further, since the concave curved surface 25d faces the exhaust port 12, the air that has entered the resonance chamber 11 is smoothly discharged from the exhaust port 12, and is generated without fading sound.

  As described above, according to the whistle 1 of the present embodiment, the sound is stably generated even if it is blown strongly or weakly, and if the inlet 22 of the air supply passage 21 is opened, the sound is high and loud. It can be suitably used when going out and seeking help in an emergency. As an example, a high sound having an intensity peak of about 5 kHz can be generated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified and implemented.
For example, in the embodiment, the movable lower wall 25 can change the inclination angle of the lower wall relative to the upper wall of the air supply passage 21, but the lower wall 27 ′ is integrated with the main body 10 as shown in FIG. 4. It can also be set as the structure which fixed the inclination | tilt angle of the air supply path 21 uniformly. Even in this case, if the height H2 of the inlet 22 and the height of the outlet 23 of the substantially flat air supply passage 21 are set within the predetermined ranges defined in the present invention, a sound is emitted regardless of the blowing force. In addition, the effect of the present invention of generating a high and loud sound can be obtained. Moreover, as an emergency whistle, it is possible to request rescue immediately after taking out in an emergency.

  Further, the structure for restricting the operation of the movable lower wall 25 is not limited to that of the embodiment. For example, as in the modification shown in FIGS. On the other hand, the body component 115 may be formed with a groove 116 that can accommodate the protrusion 126 in a portion facing the protrusion 126. Also in this structure, if the movable lower wall 125 is designed so that the protrusion 126 and the wall of the groove 116 come into contact with each other in a posture where the movable lower wall 125 is fully closed and opened, the rotation range of the movable lower wall 25 is appropriately set. can do.

  Furthermore, in the embodiment, the lower wall 27 of the air supply passage 21 is configured to be movable. However, as shown in FIGS. 6A and 6B, the lower wall 227 is fixed and the upper wall 226 is fixed. It is good also as a structure rotated around the rotating shaft 226a. At this time, the position restriction when the upper wall 226 is closed by the protrusion 226b provided on the upper wall 226 is possible as in the embodiment. Further, the position restriction when the upper wall 226 is opened may be formed by forming a protrusion 216 that contacts the rear end of the upper wall 226 on the inner wall of the resonance chamber 11. When the upper wall 226 is configured to be movable as described above, the exhaust port 12 is also moved integrally with the upper wall 226, as shown in FIGS. 6 (a) and 6 (b). In addition, it is possible to prevent a change in tone color and a blurring of sound due to manufacturing errors.

  Further, the movable lower wall 25 in FIG. 2 and the movable upper wall 226 in FIG. 6 can be applied in combination, so that both the upper wall and the lower wall can be configured to be movable.

Next, the Example which confirmed the effect of the whistle of this invention is described.
In the whistle having the substantially flat air supply passage similar to the embodiment, the frequency of the generated sound was measured by changing the inlet height and the outlet height of the air supply passage. For frequency measurements, use Sound
Using analyzer TES-1358A, the frequency at which the intensity was maximum in each test was plotted. The width of the air supply passage was 10 mm.
FIG. 7 is a graph showing the test results of the example.
When the height of the outlet was changed to 0.2 mm, 0.3 mm, 0.5 mm, 1.0 mm, 1.2 mm, and 1.5 mm, it was stable in the range of 0.3 to 1.0 mm. Sound was generated, but in the case of 0.2 mm, 1.2 mm, and 1.5 mm, high sound and sufficient sound were not generated.
Then, when a plurality of tests were performed by changing the height of the entrance between 0.5 and 4.0 mm, a high sound of 3 kHz or more was generated in the range of 0.8 to 3.5 mm. In particular, in the range of 1.0 to 3.0 mm, a loud sound higher than 3 kHz was generated.
It has been found that in order to generate a higher sound, for example, a sound higher than 3.5 kHz, the height of the inlet should be set in the range of 2.0 to 3.0 mm.

1 is an overall perspective view of a whistle according to an embodiment. (A) is a perspective view of a movable lower wall, (b) is a figure corresponded in the XX sectional view in FIG. FIG. 2 is a cross-sectional view taken along the line X-X in FIG. 1, where (a) shows normal use and (b) shows emergency use. It is a figure equivalent to the XX sectional view of Drawing 1 showing the 1st modification of the present invention. It is a figure equivalent to the XX line section of Drawing 1 showing the 2nd modification of the present invention, (a) is in the state where the entrance of the air supply passage was narrowed, (b) is the entrance of the air supply passage. Shows the widened state. It is a figure equivalent to the XX line section of Drawing 1 showing the 3rd modification of the present invention, (a) is the state where the entrance of the air supply passage was narrowed, (b) is the entrance of the air supply passage. Shows the widened state. It is a graph which shows the test result of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Whistle 10 Main body 11 Resonance chamber 12 Exhaust port 12a Edge 13 Strap hole 20 Mouthpiece 21 Air supply passage 22 Inlet 23 Outlet 25 Movable lower wall

Claims (2)

A whistle comprising a resonance chamber and a body having an exhaust port communicating with the resonance chamber and the outside, and a mouthpiece having a substantially flat air supply passage for sending air into the resonance chamber,
In the air supply passage, the height of the outlet connected to the resonance chamber is 0.3 to 1.0 mm, and the height of the inlet is 0.8 to 3.5 mm to form the air supply passage. One or both of the wall and the lower wall are configured to be movable, and the inclination of the air supply passage is variable. The whistle according to claim 1, wherein the air supply passage has a shape that gradually narrows from an inlet toward an outlet .

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