JPS6246229Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drum head in which a tuning bolt is less likely to loosen and a stable tuning state can be maintained.

Drum heads used in membrane percussion instruments such as drums and tempanies are made of animal leather, plastic film, etc., and by hitting them with a stick, mallet, or other plectrum, a unique percussion sound can be obtained. . In this case, the drum head is usually mounted on a support tensioning means 2, as shown in FIG.
A plurality of tuning bolts 4 disposed on the outer circumferential surface of the trunk body 3 are sequentially tightened, and the tightening frame 5 By pushing down the head frame 6, the tension of the drum head 1 is gradually increased to raise the pitch. The peripheral edge of the drum head 1 is fixedly held by the head frame 6.

By the way, when it comes to music that emphasizes bass these days,
Since it is required to set the tuning of the drum to a low state, the drum is often used with the tuning bolt 4 not being tightened very much (the head frame 6 is not pressed too much by the clamping frame 5). However, in such a state, the tuning bolt 4 easily loosens due to vibrations etc. during performance, making it impossible to maintain a stable tuning state for a long period of time, resulting in pitch deviations, and There was an inconvenience that it made it impossible to perform well on the drums. On the other hand, if you perform high tuning, the drum head 1 will be fully extended, so although you can get high notes, the sound will sound constricted, and you will not be able to achieve satisfactory tuning. It was difficult to obtain the tone.

This idea was made in view of the above-mentioned points, and a circular concave or convex portion of uniform thickness is integrally provided in the center of the drum head, which has a substantially flat outer edge. By absorbing the pressing force against the head frame, it is possible to tighten the tuning bolts tightly to prevent them from loosening in low tuning conditions, and to allow some leeway for drum head elongation in high tuning conditions regardless of tuning. To provide a drum head capable of producing a sound with a long and extended sound.

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a partially cutaway perspective view showing an embodiment of the drum head according to the invention, and FIG. 3 is a sectional view of the same head. In these figures, the drum head 10 is integrally formed of a synthetic resin film such as polyester and has a uniform thickness, and a circular shape centered on the center of the drum head 10 is located at the center of the striking surface 10A. A convex portion 11 is formed.
This convex portion 11 is provided to allow room for expansion of the drum head 10, and bulges toward the surface of the drum head 10 so as to form part of a spherical surface. Also,
The reason why the protrusion 11 is provided at the center of the drum head 10 is to prevent the isotropy of the head 10 from being impaired. In this case, the cross-sectional shape of the convex portion 11 is not limited to an arc shape, but is approximately trapezoidal as shown in FIG. 4a.
1A, and instead of the convex portion 11, the fourth
The recesses 12A and 12B shown in FIGS. b and c may also be used.

The peripheral edge of the drum head 10 is fitted into the head frame 6 and fixedly held by an adhesive 14, as in the conventional case.

Thus, with the drum head 10 having such a structure, loosening of the tuning bolt can be prevented and a stable tuning state can be maintained.
That is, the drum head 10 according to this invention has a peripheral edge similar to that of a drum head of an ordinary acoustic drum, which has a uniform thickness and is substantially flat. Therefore, when the drum head is tensioned, the tension in the range formed on this plane is approximately uniform, and the membrane vibrates in the same way as a normal drum. The center portion of the drum head 10 has a convex portion 1.
1, the tension in this area is lower than that at the periphery. Therefore, the central part functions as a buffer part, and when the tuning bolt 4 is tightened or loosened, the central part absorbs the deformation due to the tension of the drum head 10 to a large extent.
The amount of change in tension of the drum head 10 per unit amount of deformation of the head (which may be considered as one unit amount of rotation of the tuning bolt 4) is made smaller than that of a normal acoustic drum head. In other words, most of the tuning of the drum head 10 is performed at the portion R where the open end of the drum body 3 (see FIG. 1) comes into contact, as with conventional drum heads, but due to the presence of the convex portion 11, the striking surface 10A of the drum head 10 is It has some margin for elongation regardless of tuning. This is similar to the fact that a drum head that has been used to some extent produces a more extended sound than a brand new drum head. Therefore, the sound that is actually played comes out as a slow sound with a low pitch. Therefore, even if the tuning bolt 4 (see Fig. 1) is tightened to some extent, it will not be possible to
Since the convex portion 11 of 0 absorbs it, loosening of the tuning bolt 4, which has been considered a problem in the past, can be eliminated, and a favorable low tuning state can be maintained. Furthermore, in a high tuning state, as described above, there is some margin for extension of the drum head 10, so that a sound with extension can be obtained.

The drum head can be manufactured easily if the male and female molds of the injection molding machine are provided with concave and convex surfaces that fit into the concave or convex portions.

As explained above, the drum head according to the present invention has a circular concave or convex portion integrally provided in the center of the drum head with a uniform thickness, and is configured to absorb the pressing force against the head frame. Even when low tuning is required, the tuning bolt can be tightened to a certain degree and loosening of the bolt can be prevented. In addition, when the tuning is high, the drum head has plenty of room to expand, so the sound expands, eliminates the stuffy feeling, and produces a more relaxed sound.This has great practical effects. It is large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a drum using a conventional drum head, Fig. 2 is a partially cutaway perspective view showing an embodiment of the drum head according to this invention, Fig. 3 is a sectional view of the same head, and Fig. 4 a. , b and c are sectional views showing other embodiments of this invention. 10... Drum head, 10A... Hitting surface, 1
1, 11A... Convex portion, 12A, 12B... Concave portion.

Claims (1)

[Scope of utility model registration request] 1. A drum head characterized in that a circular concave or convex portion of uniform thickness is integrally provided in the center of the drum head having a substantially flat outer edge.