JPS5812219Y2 - Drum with a built-in bowl-shaped rotating body゜ - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drum that has a built-in comb-shaped rotating body and is intended to rotate the rotating body to obtain a unique acoustic effect.

Conventional drums have heads on the top and bottom,
The head was stretched strongly to produce high-pitched sounds, and the lower head was adjusted loosely relative to the top head to produce a low-pitched sound.

Also. Using only the top head without installing the bottom head,
There was also a drum that had no sound from the bottom head at all.

With these drums, it was possible to change the sound to some extent by changing the tension of the head.

If the material, wall thickness, diameter, and depth of the shell were constant, it was impossible to obtain particularly large changes in acoustic effects.

For this reason, drum performance itself was centered around rhythm performance.

In view of the above, the present invention improves the conventional drum,
The aim is to provide a drum system that produces unique acoustic effects.

In the drum of this invention, a comb-shaped rotary body, which is a hollow spherical body with a diameter proximate to the inner circumferential surface of the drum body, is halved and is pivoted inside the drum body, and one of the rotary shafts protrudes outward to drive the rotation. This is a distant relative of the above objective.

The present invention will be explained based on the drawings. As shown in FIG. 1, an upper head 2 and a lower head 3 are attached to the upper and lower surfaces of a drum body 1.

A drive motor rotation driver 4 is installed on the side.

The rotational force of this drive motor 40 is transmitted via a belt 5 to a gooley 6 provided at the center of the side surface of the drum body 1, which has a rotating shaft 7 and a collar 9 fixed to this via a screw 8. The comb-shaped rotating body 10 is rotated.

Incidentally, the comb-shaped rotating body 10 is a hollow spherical body whose diameter is close to the inner peripheral surface of the drum body 1, which is halved.

At this time, the degree of proximity is. The inner diameter of the drum body - the diameter of the comb-shaped rotating body = 2 to 1 own, the thickness of the comb-shaped rotating body 10 is 3 to 107H7B, and the material is glass fiber or the like.

FIG. 4 shows a comb-shaped rotating body 10 having a balancer 12. As shown in FIG.

That is, a comb-shaped rotating body 10 having a buckle portion 9 is fixed to the rotating shaft 7 via a screw 8 .

Further, the balancer holding rod 11 has a balancer 12 at its tip, and is fastened to the rotating shaft 7 and the comb-shaped rotating body 10 via a nut 13 .

By screwing the balancer 12 into the balancer holding rod 11, fine adjustment of the balance is possible.

FIG. 5 shows a comb-shaped rotating body 10 using one spherical cage body.

That is, a spherical cage portion 14 is fixed to the one-rotation shaft 7 via a screw 8 .

The comb shape is obtained by applying a surface coating process such as covering half of the surface of the spherical basket body with paper or cloth with a surface coating to improve sound reflection efficiency. A rotating body 10 is formed.

In FIG. 6, four effects of the drum of the present invention having one or more structures will be described.

That is, FIG. 6 is a sectional view showing a situation in which the center point of the pillow-shaped rotating body 10 rotates in the direction of the arrow.

In FIG. 6A, the middle point approaches the left side surface of the drum body 1 at its maximum, and the convex portion of the pillow-shaped rotating body 10 directly faces the top head 2.

In this condition. When the top head 2 is hit, most of the sound hits the spherical part of the pillow-shaped rotating body 10 and is reflected, causing an extremely complex reverberation and producing a special acoustic effect. .

At the mouth in FIG. 6, the midpoint is rotated by 90 degrees in the direction of the arrow from A in FIG. 6, and the midpoint approaches the lower head 3 at its maximum.

When the upper head 2 is struck in this state, the sound hits the spherical part and is reflected in a complicated manner, and the sound does not hit the spherical part but directly hits the lower head 3 and causes it to vibrate.

This produces a variety of acoustic effects.

The sound reflected inside the helmet and drum body 1 is caused by the pillow-shaped rotating body 1.
Even a recess of 0 will cause complex reflections.

Furthermore, in the process of continuing to rotate from the state shown in Figure A to the open-mouth state, the position symmetrical to the midpoint moves away from the right side of the drum body 1 and as it approaches the upper head 2, the drum body 1 has a pillow-shaped rotating body 10 as shown in Fig.
The volume will increase rapidly compared to the state where it is divided into parts.

This creates a unique sound effect.

In FIG. 6C, the midpoint is rotated 90 degrees in the direction of the arrow from the opening in FIG. 6, and the midpoint is closest to the right side surface of the drum body 1.

The concave portion of the pillow-shaped rotating body 10 directly faces the upper head 2.

If you hit the top head 2 in this state, the sound will hit the recess,
Because it is reflected in an extremely complex manner, it produces a unique acoustic effect.

In FIG. 6 2, the midpoint is rotated 90 degrees in the direction of the arrow from FIG.
The position is symmetrical to the state of the drawing opening.

If the central part of the top head 2 is struck in this state, the acoustic change will be similar to the state at the mouth in Figure 6.

However, if the top head 2 is hit not at the center of the head but near the edge, the pillow-shaped rotating body 10
Since the position of the mouth opening and the second figure are symmetrical, the sound reflected from the spherical part will have a difference in strength of 1 and 1. There will be a subtle difference between the two, and this will create a special acoustic effect. It will be exciting.

Furthermore, if the pillow-shaped rotating body 10 continues to rotate from the state shown in Fig. 2 and moves to the state shown in Fig. A, if the upper surface head 2 is continuously struck, the lower surface inside the drum body 1 The echo sound from the head 3 is rapidly absorbed, and the echo is not transmitted to the upper head 2.

This produces a variety of sound effects.

As described above, when hitting the upper head 2 while rotating the pillow-shaped rotary body 10, the drum of the present invention generates various changes in sound as described above.

Furthermore, if the drive motor 4 is provided with a speed change mechanism, it is possible to obtain a rotation speed and number of rotations that match the rhythm of the music.

If the balancer 12 is installed, there is no need to worry about vibrations or abnormal noises caused by one rotation even when the rotation becomes high speed.

In addition, when the pillow-shaped rotating body 10 is formed of a spherical cage, half of its surface can be made of light paper or cloth, so even without a balancer, vibrations due to rotation and abnormal noise can be avoided. There is no need to worry about it occurring.

In addition, if the transmission mechanism is provided with a rotating mechanism or an angular movement mechanism such as a 4-rotation mechanism, the positions A9, C, and 2 in Figure 8 will be interlocked with each other as stopping points, and a unique sound will be emitted. I will continue to do so.

Similar rotation can be transmitted by using a shaft, gears, etc. instead of the skin, belt 5, and pulley 6.

The same rotational force can be obtained by using a single foot pedal, a crank, etc. in place of the drive motor 4.

Moreover, if the pillow-shaped rotating body 10 is made removable.

It can also be used as a general drum.

The effect will be even greater if the front and back surfaces of the pillow-shaped rotating body 100 are made of a material that easily reflects sound, such as metal, or if the surface hardness is increased by painting or the like.

Incidentally, even with a pillow-shaped rotating body that does not have the collar portion 9, it is possible to obtain the same effect as described above.

In addition, if you stop it at any position without continuous rotation, it can be used in various ways in the situations shown in Figure 6, A, C, and II, as well as in intermediate cases. You can get different sound effects.

Even when each of the pillow-shaped rotating bodies as described above is mounted on a drum that does not use a lower head, the same or even more varied acoustic effects can be expected.

At this time, the rotating shaft 7 can be positioned at any position on the side surface of the drum body 1.

Furthermore, if the rotating shaft 7 is made strong, as shown in Fig. 3,
Since there is no need for a rotating shaft that extends from side to side, there is no need for a rotating shaft that would interfere with the echoing sound.

In addition, for the purpose of reinforcing the pillow-shaped rotating body 10, it is also possible to use a very thin strong material such as wire or piano wire and stretch it vertically, horizontally, or in a cross shape.

As described above, the drum of the present invention is capable of producing a unique acoustic effect, whereas conventional drums are mainly used for playing rhythms.

It also offers the possibility of pursuing new musical expressions in drum performance.

[Brief explanation of drawings]

FIG. 1 is a side view of a single drum. FIG. 2 is a sectional view taken along the line A-A in FIG. 1. FIG. 3 is a perspective view showing an embodiment of a pillow-shaped rotating body. FIG. 4 and FIG. 5 are perspective views showing another embodiment 2 of the pillow-shaped rotating body. FIG. 6 is a sectional view showing the rotation state of the pillow-shaped rotating body. 1 is a drum cylinder, 2 is an upper head, 3 is a lower head, 4 is a drive motor (rotary drive body), 5 is a belt,
6 is a pulley, 7 is a rotating shaft, 8 is a screw, 9 is a collar, 10 is a pillow-shaped rotating body, 11 is a balancer holding rod, 12 is a balancer, 13 is a tightening nut ,1
4 is a spherical basket part.

Claims (1)

[Scope of utility model registration request] A comb-shaped rotary body 10, which is a hollow spherical body with a diameter close to the inner circumferential surface of the drum body 1 and is halved, is supported by a rotary shaft 7 that is pivotally supported by the drum body 1, and is built in. The drum has a built-in comb-shaped rotary body, which is configured such that one side of the shaft 7 projects outward from the drum body 1 and is connected to the rotary drive body 4 so as to be interlocked.