Elastic body, head, percussion instrument, and attachment method for elastic body

Abstract

A rubber hoop 6 includes: a to-be-struck part 60 that is disposed on an upper surface of a head 5; a plurality of insertion parts 61a that protrude downward from the to-be-struck part 60; and hook parts 61b that are formed so as to extend from the insertion parts 61a. Since the hook parts 61b are hooked on a lower surface of the head 5 in a state in which the insertion parts 61a are inserted into a plurality of attachment holes 51 of the head 5, a rubber hoop 6 can be attached to the upper surface of the head 5 while making it unnecessary to form a recessed part in a hoop 7 for hooking the rubber hoop 6 as in the prior art. Consequently, since the radial thickness of the hoop 7 can be reduced, the percussion instrument 100 can be miniaturized.

Description

Elastic body, head, percussion instrument, and method for attaching elastic body

[0001] The present invention relates to an elastic body, a head, a percussion instrument, and a method for attaching an elastic body, and more particularly to an elastic body, a head, a percussion instrument, and a method for attaching an elastic body that allows the size of a percussion instrument to be reduced.

[0002] There are known percussion instruments in which the top surface (striking surface) of the head is surrounded by an elastic body. For example, Patent Document 1 describes a rim 5 (elastic body) that includes an annular struck portion 50 and a plurality of clamped portions 51 formed on the outer circumferential surface of the struck portion 50. In this technology, a plurality of receiving portions 40a for receiving the clamped portions 51 of the rim 5 are formed on the inner circumferential surface of the hoop 4.

[0003] With the clamped portion 51 fitted into the housing portion 40a, tension is applied to the head 3 by the hoop 4 (the hoop 4 is fixed to the body portion 2), and the rim 5 is attached to the top surface of the head 3. In this attached state, the top surface (striking surface) of the head 3 is surrounded by the struck portion 50 of the rim 5, allowing performances that imitate rim shots to be performed by striking the struck portion 50.

[0004] Japanese Patent Application Laid-Open No. 2019-148623 (for example, paragraphs 0030 and 0036, FIG. 2)

[0005] However, in the conventional technology described above, it is necessary to form a recess (receptacle 40a) on the inner circumferential surface of the hoop for attaching the elastic body. In order to ensure the strength of the hoop while forming such a recess, it is necessary to make the hoop thick in the radial direction, which has the problem of increasing the size of the percussion instrument.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide an elastic body, a head, a percussion instrument, and a method for attaching an elastic body that can reduce the size of a percussion instrument.

[0007] In order to achieve this purpose, the elastic body of the present invention is a percussion instrument having a body with an opening at the upper end and a head that covers the opening of the body, and is an elastic body that is attached to the percussion instrument having a plurality of mounting holes formed in the head, and is equipped with a struck portion that is placed on the upper surface of the head, a plurality of insertion portions that protrude below the struck portion, and hook portions that are formed to extend from the insertion portions, and the struck portion is attached to the head by inserting the insertion portions into the mounting holes, and in this attached state the hook portions are hooked onto the underside of the head.

[0008] The head of the present invention is attached to a percussion instrument having a body with an opening on the upper end side, and covers the opening of the body.The head has multiple mounting holes and is capable of attaching an elastic body having a struck portion that is placed on the upper surface of the head, multiple insertion portions that protrude below the struck portion and are inserted into the mounting holes, and hook portions that are formed to extend from the insertion portions and are hooked onto the underside of the head.

[0009] The percussion instrument of the present invention comprises a body having an opening at the upper end, a head covering the opening of the body and having a plurality of mounting holes formed therein, and an elastic body, the elastic body comprising a struck portion disposed on the upper surface of the head, a plurality of insertion portions protruding below the struck portion, and hook portions formed to extend from the insertion portions, the struck portion being attached to the head by inserting the insertion portions into the mounting holes, and in this mounted state the hook portions are hooked onto the underside of the head.

[0010] The method for attaching an elastic body of the present invention is a method for attaching an elastic body to a percussion instrument that includes a body having an opening at the upper end, a head that covers the opening of the body, and an elastic body attached to the head, wherein the elastic body has a struck portion that is placed on the upper surface of the head, a plurality of insertion portions that protrude below the struck portion, and a hook portion that is formed to extend from the insertion portion, and the hook portion is hooked onto the underside of the head by inserting the insertion portions into a plurality of mounting holes formed in the head.

[0011] Fig. 3 is an exploded perspective view of a percussion instrument according to one embodiment; Fig. 4 is a partially enlarged perspective view of a head and a rubber hoop; Fig. 5 is a partially enlarged cross-sectional view of the percussion instrument showing how the head and the rubber hoop are attached to the upper end portion of the shell; Fig. 6 is a partially enlarged cross-sectional view of the percussion instrument showing the state in which the head and the rubber hoop are attached to the upper end portion of the shell from the state in Fig. 3 .

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments will now be described with reference to the accompanying drawings. First, the overall configuration of a percussion instrument 100 will be described with reference to Figure 1. Figure 1 is an exploded perspective view of the percussion instrument 100 according to one embodiment.

[0013] As shown in Figure 1, percussion instrument 100 is an electronic percussion instrument that resembles an acoustic drum, and includes a shell 1 that forms its housing. Shell 1 is cylindrically formed using metal, wood, or resin. In the following explanation, the direction around the axis of shell 1 will be referred to as the circumferential direction, and the direction perpendicular to the axis of shell 1 will be referred to as the radial direction. A frame 4 that supports a central sensor 2 and peripheral sensors 3 is hooked onto the upper edge of shell 1.

[0014] The frame 4 comprises an approximately disk-shaped bottom 40, a side wall 41 rising upward from the outer edge of the bottom 40, and a curved portion 42 formed on the upper edge of the side wall 41, and each of these portions 40 to 42 is integrally formed using a resin material.

[0015] The side wall 41 of the frame 4 is formed in a cylindrical shape that surrounds the entire periphery of the bottom 40, and a curved portion 42 curves from the upper edge of the side wall 41 toward the outer periphery. The curved portion 42 is formed in an arc shape (convex upward) that follows the upper edge of the shell 1, and the curved portion 42 is hooked onto the upper edge of the shell 1, thereby supporting the frame 4 on the inner periphery of the shell 1.

[0016] The opening at the upper end of the frame 4 (shell 1) is covered by the head 5. The head 5 is formed in a disk shape using a mesh woven from synthetic fibers, and an annular head frame 50 is fixed to the outer edge of the head 5. The head frame 50 is formed using a resin material, and the head 5 and head frame 50 are molded integrally by mold molding. Note that the head frame 50 may be formed using a material other than resin (for example, a metal such as aluminum or iron), and the head frame 50 may be joined to the head 5 by adhesive or the like.

[0017] A plurality of rectangular mounting holes 51 (12 in this embodiment) are formed at equal intervals around the periphery of the head 5, and a rubber hoop 6 is attached to the head 5 using these mounting holes 51.

[0018] The rubber hoop 6 includes an annular struck portion 60 that surrounds the upper surface (striking surface) of the head 5, and multiple anchors 61 (12 in this embodiment) that protrude downward from the struck portion 60. The struck portion 60 and anchors 61 are integrally formed using rubber.

[0019] The anchors 61 are arranged at equal intervals in the circumferential direction (at positions corresponding to the mounting holes 51 ), and the rubber hoop 6 is attached to the head 5 by fitting these anchors 61 into the mounting holes 51 .

[0020] The head 5 is fixed to the percussion instrument 100 (housing) by an annular hoop 7. The hoop 7 has through holes (not shown) formed at equal intervals around the circumference for inserting tension bolts B1, and a plurality of lugs 8 (eight in this embodiment) for fastening the tension bolts B1 are provided at equal intervals around the circumference on the outer periphery of the shell 1 (housing).

[0021] The lug 8 has a threaded hole 80 extending vertically, and tension is applied to the head 5 by fastening a tension bolt B1 into the threaded hole 80 of the lug 8 with the head frame 50 of the head 5 hooked onto the hoop 7. This causes the upper surface of the head 5 to become the striking surface, and vibrations caused by hitting this striking surface are detected by the central sensor 2 and peripheral sensors 3.

[0022] A single central sensor 2 is supported in the center of the bottom 40 of the frame 4, and multiple (three in this embodiment) peripheral sensors 3 are supported on the outer edge of the bottom 40 and arranged at equal intervals in the circumferential direction. Each of these sensors 2, 3 is attached to a plate 9 fixed to the bottom 40 of the frame 4.

[0023] A disk-shaped sensor (piezoelectric element, not shown) is adhered to the upper surface of the plate 9 with cushioned double-sided tape (not shown), and a cushion is adhered to the upper surface of this sensor. The double-sided tape, sensor, and cushion constitute the central sensor 2 and peripheral sensor 3. The cushions of the central sensor 2 and peripheral sensor 3 are truncated cone-shaped buffer materials made of flexible material such as sponge, rubber, or thermoplastic elastomer, and these cushions come into contact with the underside of the head 5.

[0024] Although not shown, a rim sensor (disk-shaped piezoelectric element) for detecting impacts on the rubber hoop 6 is adhered to the underside of the plate 9 supporting the central sensor 2. When vibrations are detected by the rim sensor, central sensor 2, and peripheral sensor 3, a musical sound signal based on the detection results is generated by a sound source (not shown), and this musical sound signal is output to an amplifier and speaker (neither of which are shown), causing electronic musical tones to be emitted from the speaker.

[0025] Next, the detailed configuration of the head 5 and rubber hoop 6 will be described with reference to Figures 2 and 3. Figure 2 is a partially enlarged perspective view of the head 5 and rubber hoop 6, and Figure 3 is a partially enlarged cross-sectional view of the percussion instrument 100 showing how the head 5 and rubber hoop 6 are attached to the upper end portion of the shell 1. In Figure 2, dotted hatching is applied to the surface of the head 5 (upper head 5a and lower head 5b).

[0026] 3 shows a cross section (i.e., a cross section not including the mounting hole 51) cut along a plane that includes the axis of the shell 1 and the hook portion 61b of the anchor 61 (see FIG. 2), and while the area of ​​the head 5 where the mounting hole 51 is formed is hatched, the cross section of the head 5 is not hatched. Also, as shown in FIG. 2, the head 5 is composed of an upper head 5a and a lower head 5b, but in FIG. 3, only one head 5 is shown to simplify the drawing (the same applies to FIG. 4, which will be described later).

[0027] 2, the head 5 is composed of an upper head 5a, the upper surface of which is the striking surface, and a lower head 5b, which is placed underneath the upper head 5a, and similarly, the mounting holes 51 are composed of a mounting hole 51a formed in the upper head 5a and a mounting hole 51b formed in the lower head 5b. The opening dimension (opening width) of the mounting hole 51b in the circumferential direction is smaller than the opening dimension of the mounting hole 51a, while the opening dimensions (opening length) of the mounting holes 51a and 51b in the radial direction are the same.

[0028] As shown in Figures 2 and 3, the anchor 61 comprises an insertion portion 61a that protrudes downward from the underside of the struck portion 60, a hook portion 61b that protrudes circumferentially on both sides from the insertion portion 61a (having a larger circumferential dimension than the insertion portion 61a), and a protrusion portion 61c that protrudes further downward from the hook portion 61b, and each of these portions 61a to 61c is formed integrally with the struck portion 60.

[0029] Each of the portions 61a to 61c of the anchor 61 is formed in a plate shape whose radial dimension (plate thickness) is smaller than its circumferential dimension (width). The circumferential dimensions of the insertion portion 61a and the protruding portion 61c are formed to be the same as (or slightly smaller than) the opening dimension of the mounting hole 51b in the same direction.

[0030] When attaching the rubber hoop 6 to each head 5a, 5b, first, the protruding portion 61c of the anchor 61 is inserted into the mounting hole 51a, 51b. The dimension (width dimension) of the hook portion 61b in the circumferential direction is larger than the opening dimension of the mounting hole 51a, 51b in the same direction, so when the protruding portion 61c is inserted into the mounting hole 51a, 51b, the hook portion 61b is hooked onto each head 5a, 5b.

[0031] In this state, by further pulling the protruding portion 61c downward or by twisting the protruding portion 61c and pulling it downward, the hook portion 61b passes through the mounting holes 51a and 51b. By passing the entire hook portion 61b through the mounting holes 51a and 51b, the insertion portion 61a is inserted into the mounting holes 51a and 51b, and the hook portion 61b is hooked onto the underside of the head 5 (lower head 5b) (see FIG. 3). By fitting all of the anchors 61 into the mounting holes 51 (see FIG. 1) lined up in the circumferential direction, the attachment of the rubber hoop 6 to the head 5 is completed.

[0032] As described above, in this embodiment, when the insertion portions 61a are inserted into the multiple mounting holes 51 in the head 5, the hook portions 61b are hooked onto the underside of the head 5. This eliminates the need to form recesses in the hoop 7 for hooking the rubber hoop 6, as in the prior art, and allows the rubber hoop 6 (striked portion 60) to be attached to the upper surface of the head 5. This allows the radial thickness of the hoop 7 to be reduced, thereby enabling the percussion instrument 100 to be made more compact. Furthermore, this reduces the amount of material used to mold the hoop 7, thereby reducing the manufacturing cost of the hoop 7. Furthermore, the rubber hoop 6 can be attached to a percussion instrument 100 equipped with an existing hoop 7 that does not have recesses, as in the prior art. In other words, the rubber hoop 6 can be attached to a percussion instrument 100 (electronic drum) with a design and structure similar to that of an acoustic drum, or to an acoustic drum itself.

[0033] Here, for example, even in a configuration in which the protruding portion 61c of the anchor 61 is omitted, it is possible to hook the hook portion 61b onto the underside of the head 5 (lower head 5b). However, in such a configuration, it is time-consuming to insert (fit) the hook portion 61b into the mounting holes 51a and 51b.

[0034] In contrast, in this embodiment, the protrusion 61c is provided, which protrudes downward from the hook 61b. Therefore, as described above, by pulling (or twisting) the protrusion 61c further downward while the protrusion 61c is inserted into the mounting holes 51a and 51b, the insertion of the hook 61b into the mounting holes 51a and 51b can be guided. This improves the workability of attaching the rubber hoop 6 to the head 5.

[0035] Each of the hook portions 61b extending from the protruding portion 61c on both sides in the circumferential direction has an inclined surface 61e formed so as to obliquely cut out the lower end of the side surface 61d (see FIG. 2) of the hook portion 61b facing the circumferential direction. The inclined surface 61e is a flat surface that slopes upward from the lower surface 61f of the hook portion 61b toward the side surface 61d.

[0036] In this way, the hook portion 61b is formed in a tapered shape that narrows toward its lower end, so that when the hook portion 61b (inclined surface 61e) passes through the mounting holes 51a, 51b, the heads 5 (heads 5a, 5b) deform so as to widen the mounting holes 51a, 51b. This makes it easy to fit the hook portion 61b into the mounting holes 51a, 51b, improving the workability of attaching the rubber hoop 6 to the heads 5.

[0037] Here, when manufacturing the head 5, the upper head 5a and the lower head 5b are set in a mold (not shown) in a stacked state, and in this state a resin head frame 50 is integrally molded around the outer edges of each of the heads 5a, 5b. Since known methods can be used to manufacture the head 5 by mold molding, detailed explanations will be omitted, but an example of a known manufacturing method is the method described in JP 2015-064553 A (see FIG. 18, for example).

[0038] The mounting holes 51a, 51b of the heads 5a, 5b can also be formed after this molding process, but after the heads 5 are molded, the upper and lower heads 5a, 5b have a dome-like shape that protrudes above the head frame 50, making it difficult to form the mounting holes 51a, 51b in the designed shape.

[0039] Therefore, in this embodiment, the mounting holes 51a, 51b are pre-drilled in the upper head 5a and the lower head 5b, and then the head frame 50 is integrally molded. This allows the mounting holes 51a, 51b to be drilled with the heads 5a, 5b flat, so the mounting holes 51a, 51b can be formed in the shape as designed.

[0040] Furthermore, because the head 5 is a mesh made of woven synthetic fibers, forming the mounting holes 51a, 51b with a blade would result in fraying of the fibers at the cut portions of the head 5 (the edges of the mounting holes 51a, 51b). Therefore, in this embodiment, the mounting holes 51a, 51b are formed in the head 5 by heat treatment such as laser cutting. This allows the fibers at the cut portions of the head 5 (the edges of the mounting holes 51a, 51b) to be fused together, thereby preventing the above-mentioned fraying of the fibers.

[0041] When forming the mounting holes 51a, 51b by heat treatment such as laser cutting, for example, if the mounting holes 51a, 51b are formed while the upper and lower heads 5a, 5b are stacked, the upper and lower heads 5a, 5b may be fused together. If the upper and lower heads 5a, 5b are fused together, the fused portion will hinder the vibration of each head 5a, 5b, and vibrations generated when the upper head 5a is struck will not be transmitted efficiently to the sensors 2, 3 (see FIG. 1).

[0042] In contrast to this, in this embodiment, as described above, the mounting holes 51a, 51b are drilled (separately) in advance in the upper head 5a and the lower head 5b, and then the head frame 50 is integrally molded. This prevents the upper and lower heads 5a, 5b from fusing together even if the mounting holes 51a, 51b are formed by heat treatment such as laser cutting, so that vibrations generated when the upper head 5a is struck are more easily transmitted to the sensors 2, 3 (see FIG. 1).

[0043] On the other hand, when the mounting holes 51 a, 51 b are formed in advance in the upper and lower heads 5 a, 5 b, the relative positions of the upper and lower mounting holes 51 a, 51 b may become misaligned, for example, during the above-mentioned molding process. If such misalignment occurs and the mounting holes 51 a, 51 b have the same opening width, the mounting holes 51 a, 51 b will be partially or completely blocked, making it impossible to properly fit the anchors 61 into the mounting holes 51 a, 51 b.

[0044] In contrast, in this embodiment, the mounting hole 51a of the upper head 5a is formed larger than the mounting hole 51b of the lower head 5b, so that even if the relative positions of the upper and lower mounting holes 51a, 51b are misaligned, the mounting hole 51b is prevented from being blocked, and the anchor 61 can be properly fitted into the mounting holes 51a, 51b.

[0045] In this way, to prevent clogging of the mounting holes 51a, 51b, it is possible to form the mounting hole 51b of the lower head 5b larger than the mounting hole 51a of the upper head 5a, for example. However, the larger the opening dimensions of the mounting holes 51a, 51b, the more likely it is that vibrations of the heads 5a, 5b will be hindered. Therefore, if the mounting hole 51b of the lower head 5b, which comes into contact with the sensors 2, 3 (see FIG. 1), is made larger, there is a risk that vibrations caused by impacts on the upper head 5a will not be properly transmitted to the sensors 2, 3.

[0046] In contrast, in this embodiment, the mounting hole 51a of the upper head 5a is made larger than the mounting hole 51b of the lower head 5b, which prevents the mounting holes 51a, 51b from becoming clogged due to the above-mentioned misalignment of the relative positions, while allowing the mounting holes 51b of the lower head 5b, with which the sensors 2 and 3 come into contact, to be made relatively small. This prevents the vibration of the lower head 5b from being obstructed by the mounting hole 51b, so that vibrations generated when the upper head 5a is struck can be efficiently transmitted to the sensors 2 and 3 via the lower head 5b.

[0047] Next, the configuration of the percussion instrument 100 will be further described with reference to Figures 3 and 4. Figure 4 is a partially enlarged cross-sectional view of the percussion instrument 100, showing the state of the percussion instrument 100 in Figure 3 after the head 5 and rubber hoop 6 have been attached to the upper end portion of the shell 1 (tension has been applied to the head 5).

[0048] 3 and 4, when attaching the head 5 to the shell 1, the anchors 61 (hook portions 61b and protrusions 61c) of the rubber hoop 6 inserted into the attachment holes 51 are positioned on the outer periphery of the shell 1, and the head 5 is placed on the upper end portion of the shell 1. In this state, tension bolts B1 inserted into the hoop 7 are tightened to the lugs 8 (see FIG. 1), thereby pressing the head frame 50 downward and applying tension to the head 5. This completes the attachment of the head 5 and rubber hoop 6 to the shell 1 (the body of the percussion instrument 100).

[0049] When the head 5 (rubber hoop 6) is attached to the shell 1, the struck portion 60 is supported by the shell 1 via the curved portion 42 of the frame 4 and the head 5, and the top surface (striking surface) of the head 5 is surrounded by the struck portion 60. Because the top end of the struck portion 60 is located higher than the top end of the hoop 7, the player can strike the struck portion 60 to imitate a rim shot.

[0050] In this way, if the purpose is to surround the striking surface with the struck portion 60 arranged on the inner side of the hoop 7, it is also possible to fit the anchor 61 into the mounting hole 51 of the head 5 formed on the inner side of the shell 1, for example.

[0051] However, in a configuration in which the mounting hole 51 is formed more inward than the shell 1, when the anchor 61 is fitted into the mounting hole 51, the hook portion 61b simply gets caught on the underside of the head 5, so the impact of the blow to the struck portion 60 can cause the struck portion 60 to flutter or slide sideways relative to the head 5.

[0052] In order to prevent such unstable movement of the struck portion 60, it is necessary to make the gap between the struck portion 60 and the hook portion 61b (the length of the insertion portion 61a) approximately equal to the thickness of the head 5 (approximately 0.7 mm) so that the struck portion 60 and the hook portion 61b tightly sandwich the head 5. If the gap between the struck portion 60 and the hook portion 61b is narrowed to the thickness of the head 5, it becomes difficult to mold the rubber hoop 6. This is because the gap between the struck portion 60 and the hook portion 61b becomes the thickness of the mold.

[0053] In contrast, in this embodiment, the hook portion 61b hooked onto the underside of the head 5 is sandwiched between the outer circumferential surface of the shell 1 and the head 5, and the head 5 presses the hook portion 61b toward the shell 1. As a result, even if the gap between the struck portion 60 and the hook portion 61b (the length of the insertion portion 61a) is formed wider than the thickness of the head 5, the movement of the hook portion 61b can be restrained by the shell 1 and the head 5. This makes it possible to form the rubber hoop 6 relatively easily by mold molding, while also suppressing the unstable movement of the struck portion 60 as described above.

[0054] Furthermore, by fitting the anchor 61 on the outer periphery of the shell 1, the struck portion 60 can be positioned on the outer edge of the top surface (the area that becomes the striking surface) of the head 5. This makes it possible to ensure a large area that becomes the striking surface of the head 5, and also to prevent the struck portion 60 from interfering with the vibration of the head 5 when it is struck.

[0055] By sandwiching the hook portion 61b between the shell 1 and the head 5, the rubber hoop 6 can be stably attached, but if the hook portion 61b is excessively crushed by the head 5, the anchor 61 is likely to be damaged. For this reason, in this embodiment, a notch 43 for accommodating the hook portion 61b is formed in the curved portion 42 of the frame 4.

[0056] The notches 43 are formed by cutting out a rectangular portion of the outer edge of the curved portion 42 (the portion facing the outer peripheral surface of the shell 1), and these notches 43 are lined up in the circumferential direction at the same intervals as the multiple anchors 61 (see FIG. 1 for the rectangular shape of the notches 43). By accommodating the hook portions 61b in such notches 43, it is possible to prevent the hook portions 61b from being excessively crushed (or excessively pulled downward) by the head 5 when tension is applied to the head 5. This makes it possible to prevent damage to the anchors 61.

[0057] In this way, by sandwiching the hook portion 61b between the shell 1 and the head 5, it is possible to generally restrict unstable movement of the struck portion 60, but if, for example, a gap is formed between the struck portion 60 and the hoop 7, there is a risk of the struck portion 60 flapping or sliding as described above. If this type of unstable movement of the struck portion 60 occurs, problems such as a deterioration in the feel when striking the struck portion 60, noise caused by contact between the struck portion 60 and the hoop 7, and wear on the head 5 and the struck portion 60 may occur.

[0058] In contrast, in this embodiment, a protrusion 62 protruding from the outer peripheral surface of the struck portion 60 fills the gap with the hoop 7. The protrusion 62 is an annular protrusion that extends around the entire circumference of the struck portion 60 and is formed integrally with the struck portion 60.

[0059] By bringing the struck part 60 into contact with the inner peripheral surface of the hoop 7 via the protrusions 62, it is possible to prevent the struck part 60 from flapping or sliding sideways when struck, thereby preventing problems such as a poor feel on impact and noise generation.

[0060] In this embodiment, since the protruding portion 61c of the anchor 61 protrudes downward from the hook portion 61b, there is a risk that the protruding portion 61c may get caught on the inner circumferential side of the shell 1 (the curved portion 42 of the frame 4) when the head 5 is placed on the upper end portion of the shell 1. If tension is applied to the head 5 with the protruding portion 61c caught on the inner circumferential side of the shell 1, the anchor 61 sandwiched between the head 5 and the curved portion 42 of the frame 4 will be easily damaged, and in addition, it will not be possible to apply appropriate tension to the head 5.

[0061] In contrast, in this embodiment, the entirety of each of the portions 61a to 61c of the anchor 61 is inclined downward from the underside of the struck portion 60 toward the outer periphery (left side of FIGS. 3 and 4). This prevents the protruding portion 61c from getting caught on the inner periphery of the shell 1 when the head 5 is placed on the upper end portion of the shell 1, thereby preventing the anchor 61 from being pinched between the head 5 and the curved portion 42 of the frame 4. This prevents damage to the anchor 61 and allows the head 5 to be tensioned appropriately.

[0062] Furthermore, when the head 5 and rubber hoop 6 are attached to the shell 1, the lower end of the protrusion 61c is positioned lower than the upper end of the head frame 50. Therefore, by inserting a finger into the gap between the shell 1 and the head frame 50 and touching the protrusion 61c, it is possible to check whether the protrusion 61c is properly inserted between the shell 1 and the head frame 50 (whether the protrusion 61c is caught on the inner periphery of the shell 1 as described above). Therefore, tension applied to the head 5 can be prevented when the protrusion 61c is caught on the inner periphery of the shell 1.

[0063] When tension is applied to the head 5, the mounting hole 51 of the head 5 is displaced so as to slide toward the outer periphery (diametrically outward). For this reason, if the opening dimension of the mounting hole 51 in the radial direction is the same as the dimension of the insertion portion 61a (plate thickness of the anchor 61), when tension is applied to the head 5, the insertion portion 61a and the hook portion 61b that are caught on the edge of the mounting hole 51 are pulled toward the outer periphery, making the anchor 61 more susceptible to damage.

[0064] In contrast, in the present embodiment, the radial thickness dimension of the anchor 61 (insertion portion 61 a) is smaller than the radial opening dimension of the mounting hole 51, and therefore, even if the mounting hole 51 slides radially outward (diametrically outward) when tension is applied to the head 5, the insertion portion 61 a and the hooking portion 61 b ​​of the anchor 61 can be prevented from being pulled radially outward. Furthermore, because the hooking portions 61 b ​​protrude from the insertion portion 61 a on both circumferential sides, the hooking portions 61 b ​​can be hooked onto the underside of the head 5 even if the radial thickness dimension of the anchor 61 is smaller than the opening dimension of the mounting hole 51.

[0065] Furthermore, when the rubber hoop 6 is attached to the shell 1, the inner edge of the struck portion 60 is positioned more inward than the inner edge of the mounting hole 51, so the rubber hoop 6 (struck portion 60) can cover the entire mounting hole 51 from above. This prevents the mounting hole 51 from being exposed in the striking surface area of ​​the head 5, improving the appearance of the percussion instrument 100.

[0066] The above has been explained based on the above embodiment, but the present invention is not limited to the above embodiment, and it can be easily inferred that various improvements and modifications are possible within the scope of the present invention.

[0067] In the above embodiment, the percussion instrument 100 is an electronic percussion instrument, but the rubber hoop 6 may be attached to the head 5 of an acoustic percussion instrument (drum). One example of the structure of an acoustic percussion instrument is one in which the sensors 2, 3 and frame 4 supported on the inner periphery of the shell 1 are omitted, and the upper end portion of the shell 1 is directly covered by the head 5.

[0068] In the above embodiment, the head frame 50 of the head 5 is pressed downward by the hoop 7, but this is not necessarily limited to this. For example, a configuration may be adopted in which a through hole is formed in the head frame 50 and a tension bolt B1 inserted into the through hole is fastened to the lug 8 (the hoop 7 is omitted).

[0069] That is, the rubber hoop 6 described in the above embodiment can be attached to any percussion instrument that has a head 5 that covers at least the opening of the body and to which tension is applied to the head 5. Therefore, the structure of the body and the structure for attaching the head 5 to the body (applying tension) are not limited to the above-described forms.

[0070] In the above embodiment, the head 5 is composed of two heads, an upper head 5a and a lower head 5b, and the mounting hole 51a of the upper head 5a is larger than the mounting hole 51b of the lower head 5b. However, this is not necessarily limited to this. For example, there may be one or three or more heads 5, and the mounting hole 51b of the lower head 5b may be larger than the mounting hole 51a of the upper head 5a. Furthermore, when multiple heads 5 are stacked, the mounting holes of the multiple heads 5 may be the same size. Furthermore, although the radial opening dimensions of the mounting holes 51a, 51b have been described as being the same, the radial opening dimensions of the mounting holes 51a, 51b may be different.

[0071] Although the mounting holes 51 a, 51 b have been described as rectangular elongated holes whose radial opening dimension is larger than their circumferential opening dimension, the circumferential opening dimension of the mounting holes 51 a, 51 b may be the same as (or shorter than) their radial opening dimension. Furthermore, the shape of the mounting holes 51 a, 51 b may not be rectangular, but may be another polygonal or circular shape.

[0072] That is, as long as the hook portion 61b can be hooked onto the underside of the head 5, the opening dimensions and shapes of the mounting holes 51a and 51b in each direction can be set appropriately.

[0073] In the above embodiment, the mounting holes 51 a, 51 b are formed in advance before the heads 5 (upper head 5 a and lower head 5 b) are molded using a mold, but this is not necessarily limited to this. For example, after molding the head 5, the mounting holes 51 a, 51 b may be formed simultaneously with the upper and lower heads 5 a, 5 b stacked together.

[0074] In the above embodiment, the rubber hoop 6 made of rubber is exemplified as an example of the elastic body, but this is not necessarily limited to this. For example, the elastic body (rubber hoop 6) may be formed using other known materials such as elastomers that are used for the purpose of reducing impact and impact noise when struck.

[0075] In the above embodiment, the case where the inner edge of the struck portion 60 is located more inward than the inner edges of the mounting holes 51a, 51b was described, but the inner edge of the struck portion 60 may also be located more outward than the inner edges of the mounting holes 51a, 51b.

[0076] In the above embodiment, the anchor 61 has been described as each having a plate shape with a radial dimension smaller than its circumferential dimension, but this is not necessarily limited to this. For example, the anchor 61 may have an axial shape (a rod shape with a circular or polygonal cross section) as a whole.

[0077] Although the hook portion 61b has been described as extending from the insertion portion 61a in both circumferential directions, it may extend from the insertion portion 61a in both radial directions, or may extend from the insertion portion 61a in both circumferential and radial directions. It is also possible to have the hook portion 61b extend in a direction inclined relative to the radial direction.

[0078] Although the case where the inclined surface 61e is formed by obliquely cutting out the lower end of the side surface 61d of the hook portion 61b, that is, the case where the hook portion 61b is formed in a tapered shape that becomes narrower as it approaches its lower end, the circumferential dimension of the hook portion 61b may be constant from the upper end to the lower end. Also, the inclined surface 61e may be extended and connected to the protrusion 61c (the lower surface 61f of the hook portion 61b may also be inclined toward the protrusion 61c).

[0079] In addition, although the case where the entire portions 61a to 61c of the anchor 61 are inclined downward from the underside of the struck portion 60 toward the outer periphery has been described, the entire portions 61a to 61c of the anchor 61 may be configured to extend in the vertical direction. Also, the insertion portion 61a and the hook portion 61b may extend in the vertical direction, while only the protrusion 61c is inclined downward toward the outer periphery.

[0080] Furthermore, although the case where the protrusion 61c and the protrusion 62 are formed on the rubber hoop 6 has been described, the protrusion 61c and the protrusion 62 may be omitted. In other words, the specific shape of the rubber hoop 6 (anchor 61) is not limited to the above-described form as long as the hook portion 61b can be hooked onto the underside of the head 5. When the shape of the rubber hoop 6 (anchor 61) is changed from the above-described form, the shapes of the mounting holes 51a and 51b may be appropriately set in accordance with the changed shape.

[0081] In the above embodiment, the case where the hook portion 61b is sandwiched between the outer peripheral surface of the shell 1 and the head 5 is described, but it is also possible to form an attachment hole 51 in a portion of the head 5 that is located more inward than the shell 1, and to fit the anchor 61 into that attachment hole 51.

[0082] In the above embodiment, the case where the lower end of the protrusion 61c is located below the upper end of the head frame 50 when the head 5 is attached to the upper end of the shell 1 has been described, but this is not necessarily limited to this. For example, in the same state, the lower end of the protrusion 61c may be located above the upper end of the head frame 50 (below the lower end of the head frame 50).

[0083] In the above embodiment, the anchor 61 is formed on the underside of the struck portion 60 (the insertion portion 61a is connected to the underside of the struck portion 60), but this is not necessarily limited to this. For example, the anchor 61 may be formed on the underside of the protrusion 62 (the insertion portion 61a is connected to the underside of the protrusion 62).

[0084] In the above embodiment, a case has been described in which the radially continuous protrusions 62 are formed on the outer peripheral surface of the struck portion 60 and these protrusions 62 are brought into contact with the inner peripheral surface of the hoop 7. However, this is not necessarily limited to this. For example, the protrusions 62 may be formed intermittently along the radial direction, or the thickness of the struck portion 60 in the radial direction may be increased overall so that it comes into contact with the hoop 7.

[0085] REFERENCE SIGNS LIST 100 Percussion instrument 1 Shell (body) 4 Frame 42 Curved portion 43 Notch 5 Head 5a Upper head (head) 5b Lower head (head) 50 Head frame 51, 51a, 51b Mounting hole 6 Rubber hoop (elastic body) 60 Striked portion 61a Insertion portion 61b Hook portion 61c Protrusion 62 Projection portion 7 Hoop

Claims

1. An elastic body that is attached to a percussion instrument having a body with an opening on the upper end side and a head that covers the opening of the body, the head having a number of mounting holes formed therein, the elastic body comprising a struck part that is positioned on the upper surface of the head, a number of insertion parts that protrude below the struck part, and hook parts that are formed to extend from the insertion parts, the struck part being attached to the head by inserting the insertion parts into the mounting holes, and in this attached state the hook parts are hooked onto the underside of the head.

2. The elastic body according to claim 1, wherein said hook portion is formed in a tapered shape that narrows toward its lower end.

3. The elastic body according to claim 2, further comprising a protrusion protruding downward from said hook portion for guiding the insertion of said hook portion into said mounting hole.

4. The elastic body according to claim 1, wherein said hook portion is sandwiched between the outer circumferential surface of said body portion and said head.

5. The elastic body as described in claim 4, which is attached to the percussion instrument and comprises a frame supported on the inner periphery of the body and a curved portion formed on the outer edge of the frame and hooked onto the upper end of the body, and the hook portion is received in a plurality of notches formed in the curved portion.

6. The elastic body according to claim 1, characterized in that the elastic body is attached to the percussion instrument and has a hoop that presses downward on a head frame connected to the outer edge of the head, and in the attached state, the struck part comes into contact with the hoop.

7. The elastic body as described in claim 4, characterized in that the elastic body is attached to the percussion instrument and has a hoop that presses downward on a head frame connected to the outer edge of the head, and has a protrusion that protrudes downward beyond the hook portion and guides the insertion of the hook portion into the mounting hole, and in the attached state, the lower end of the protrusion is located lower than the upper end of the head frame.

8. The elastic body according to claim 7, wherein said protrusion is inclined downward toward the outer periphery of said struck portion.

9. The elastic body according to claim 1, characterized in that the radial dimension of the insertion portion is smaller than the radial dimension of the mounting hole, and the hook portion protrudes from the insertion portion on both sides in the circumferential direction.

10. The elastic body according to claim 9, characterized in that in the attached state, the inner edge of the striking portion is located more inwardly than the inner edge of the mounting hole.

11. A head that is attached to a percussion instrument with a body having an opening on an upper end side and covers the opening of the body, the head having a plurality of mounting holes and capable of mounting an elastic body having a struck portion disposed on the upper surface of the head, a plurality of insertion portions that protrude below the struck portion and are inserted into the mounting holes, and hook portions that are formed to extend from the insertion portions and are hooked onto the underside of the head.

12. The head according to claim 11, characterized in that the head is composed of at least an upper head whose upper surface is the hitting surface and a lower head which is placed under the upper head, and one of the mounting holes of the upper head and the lower head is formed larger than the other mounting hole.

13. The head according to claim 12, wherein said mounting hole in said upper head is larger than said mounting hole in said lower head.

14. A percussion instrument comprising: a body having an opening on an upper end side; a head covering the opening of the body and having a plurality of mounting holes formed therein; and the elastic body according to any one of claims 1 to 10.

15. A method for attaching an elastic body to a percussion instrument comprising a body having an opening on an upper end side, a head covering the opening of the body, and an elastic body attached to the head, the elastic body comprising a struck portion disposed on the upper surface of the head, a plurality of insertion portions protruding below the struck portion, and a hook portion formed to extend from the insertion portion, the method comprising the steps of: inserting the insertion portions into a plurality of mounting holes formed in the head, thereby hooking the hook portions onto the underside of the head.

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