Patent Publication Number: US-2015082967-A1

Title: Drum silencer

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Japan application serial no. 2013-200295, filed on Sep. 26, 2013. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a drum silencer. Particularly, the present invention relates to a drum silencer that is capable of reducing a percussive sound while retaining a specific tone of an acoustic drum. 
     2. Description of Related Art 
     A drum silencer is known to reduce a sound generated during performance in an environment where there is a need to avoid playing at high volume. Patent Literature 1 discloses a drum silencer, for example. According to Patent Literature 1, a silencer pad, fixed to a hoop and in close contact with a drumhead of a bass drum, is struck with a beater. In this way, vibration of the drumhead that occurs with the striking is attenuated early to reduce the percussive sound. 
     However, the traditional drum silencer, as mentioned above, achieves reduction of the percussive sound by placing the silencer pad fixed to the hoop in close contact with the drumhead so as to attenuate the vibration of the drumhead early. In such a case, free vibration of the drumhead is hindered, which impairs the specific tone of the acoustic drum. As a result, the traditional drum silencer faces the problem that the tone generated by striking the silencer pad differs significantly from the tone generated by directly striking the drumhead. 
     PRIOR ART LITERATURE 
     Patent Literature 
     [Patent Literature 1] US Patent Publication No. 2008/0264233 (FIG. 1, etc.) 
     SUMMARY OF THE INVENTION 
     In view of the above, the present invention provides a drum silencer that is capable of reducing a percussive sound while retaining a specific tone of an acoustic drum. 
     The drum silencer of the present invention achieves the following effects. In a struck body, a struck head portion supported by a frame portion has predetermined elasticity. Thus, a percussive sound generated by striking the struck head portion with a beater, a stick, or the like can be reduced. 
     In addition, the struck body is sucked to a drumhead by a sucker member. Therefore, the drumhead can vibrate with the struck body through sucker member. Accordingly, the vibration of the struck body that is struck can be transmitted to the drumhead, and hindrance to free vibration of the drumhead due to the striking can be suppressed. 
     Further, the struck body is attached to the drumhead by a suction force provided by the sucker member. Therefore, in comparison with the case where the entire struck body is in close contact with the drumhead, a contact area between the struck body and the drumhead in the present invention can be suppressed. Hence, hindrance to free vibration of the drumhead, resulting from contact with the sucker member, can be reduced. 
     Accordingly, hindrance to free vibration of the drumhead can be suppressed while the percussive sound is reduced. In other words, a tone specific to the acoustic drum can be retained. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. Three or more sucker members are disposed along a circumferential direction of the frame portion. Thus, the struck body can be stably sucked to the drumhead. Therefore, when the struck body is struck, the struck body can be prevented from tilting to touch the drumhead. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. The frame portion is formed of a resin material. In comparison with using a metal material to form the frame portion, the frame portion of the present invention can be made lighter. Accordingly, the struck body can be made lighter. Thus, attenuation of the vibration of the drumhead, caused by the weight of the struck body, can be suppressed. Hence, the tone specific to the acoustic drum can be retained when the struck body is struck. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. The struck head portion is formed of a mesh material. Thus, the struck head portion can be made lighter. 
     Moreover, the impact that occurs when the struck head portion is struck can be buffered. As a result, the percussive sound generated by the striking of the struck body can be reduced. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. In the struck body, the frame portion is fixed to the circumferential portion of the struck head portion by insert-molding the struck head portion in the resin material forming the frame portion. Thus, a mechanism for fixing the struck head portion to the frame portion can be omitted. As a result, the struck body can be made lighter. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. The struck body is fixed to the frame portion while tension is applied on the struck head portion. Thus, the beater, stick, or the like can be pushed back by a restoring force of the struck head portion when the struck head portion is struck and pressed by the beater, stick, or the like. In this way, the feel of striking the struck body can be similar to the striking feeling of striking the drumhead. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. A buffer body, formed of an elastic material and thicker than the struck head portion, is attached to the struck head portion. Thus, when the struck head portion is struck by the beater or the like installed on a foot pedal with a large force, the impact transmitted from the struck body to the drumhead can be reduced. Hence, the percussive sound generated by the striking of the struck body can be reduced. 
     According to another aspect of the present invention, in addition to the aforementioned effects, the drum silencer further achieves the following effects. The sucker member is connected with the frame portion through an elastic member. Therefore, the impact transmitted from the struck body to the drumhead can be reduced. Hence, the percussive sound generated by the striking of the struck body can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of a bass drum with a drum silencer attached thereon according to the first embodiment of the present invention. 
         FIG. 2A  is a schematic top view of the drum silencer. 
         FIG. 2B  is a schematic bottom view of the drum silencer. 
         FIG. 3  is a schematic cross-sectional view of the drum silencer along the line III-III of  FIG. 2A . 
         FIG. 4  is a schematic perspective view of a snare drum with a drum silencer attached thereon according to the second embodiment. 
         FIG. 5A  is a schematic top view of the drum silencer. 
         FIG. 5B  is a schematic cross-sectional view of the drum silencer along the line Vb-Vb of  FIG. 5A . 
         FIG. 6A  is a schematic top view of a drum silencer according to the third embodiment. 
         FIG. 6B  is a schematic cross-sectional view of the drum silencer along the line VIb-VIb of  FIG. 6A . 
         FIG. 7A  is a schematic bottom view of the drum silencer. 
         FIG. 7B  is a partially enlarged view of the VIIb section of the drum silencer of  FIG. 7A . 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Below exemplary embodiments of the present invention are described in detail with reference to the affixed figures. First, a usage example of a drum silencer  100  according to the first embodiment of the present invention is described with reference to  FIG. 1 .  FIG. 1  is a schematic perspective view of a bass drum  1  with the drum silencer  100  attached thereon according to the first embodiment. 
     As shown in  FIG. 1 , the bass drum  1  is an acoustic percussion instrument that includes a drumhead  2  serving as a struck head. The bass drum  1  can generate a tone specific to the bass drum  1  when the drumhead  2  is struck by a beater  4  that rotates with a stamp on a foot pedal  3 . 
     The drum silencer  100  is a device adapted to be attached to the drumhead  2  for reducing the sound generated during the performance. The drum silencer  100  mainly includes a struck body  10  and sucker members  20 . The struck body  10  buffers the impact caused by the striking. The sucker members  20  suck the struck body  10  onto the drumhead  2 . 
     The struck body  10  of the drum silencer  100  is sucked to the drumhead  2  by the sucker members  20 . When the foot pedal  3  is stamped by the performer, the beater  4  rotates with the stamp to strike the struck body  10 . 
     Next, the drum silencer  100  is described with reference to  FIG. 2A ,  FIG. 2B  and  FIG. 3 .  FIG. 2A  is a schematic top view of the drum silencer  100 .  FIG. 2B  is a schematic bottom view of the drum silencer  100 .  FIG. 3  is a schematic cross-sectional view of the drum silencer  100  along the line III-III of  FIG. 2A . 
     As shown in  FIG. 2A ,  FIG. 2B  or  FIG. 3 , the struck body  10  mainly includes a struck head portion  30  and a frame portion  40 . The struck head portion  30  constitutes the struck head that is to be struck by the performer. The frame portion  40  supports a circumferential portion of the struck head portion  30 . 
     The struck head portion  30  is a membranous portion formed of a stretchable mesh material. By forming the struck head portion  30  using the stretchable mesh material, the struck head portion  30  can be made lighter. In addition, the struck head portion  30  is capable of buffering the impact of the struck head portion  30  when the struck head portion  30  is struck by the beater  4  (see  FIG. 1 ). 
     Because the struck head portion  30  is formed of the stretchable mesh material, when the struck head portion  30  is pressed and deformed by the striking of the beater  4 , a restoring force of the struck head portion  30  can be utilized to push back the beater  4 . Therefore, the performer can get a feel approximating to the striking feeling of striking the drumhead  2  directly (see  FIG. 1 ). 
     Here, a buffer body  32  thicker than the struck head portion  30  is attached to a surface side (the paper front side of  FIG. 2A ) of the struck head portion  30  of the struck body  10 . 
     The buffer body  32  includes a cushion portion  33  and a hard body  34 . The cushion portion  33  is made of a spongy material and is attached to said surface side of the struck head portion  30 . The hard body  34  is connected with the cushion portion  33  on a surface (the upper side of  FIG. 3 ) opposite to a surface (the lower side of  FIG. 3 ) to which the struck head portion  30  is attached. In addition, the hard body  34  is made of a hard material harder than the cushion portion  33 . 
     Preferably, the material of the hard body  34  is harder and has higher abrasion resistance than the cushion portion  33  and may be woven or non-woven fabric, for example. 
     Here, when the struck head portion  30  is struck by the beater  4  that rotates with the stamp on the foot pedal  3 , large impact is applied to the struck head portion  30 . The large impact is transmitted to the drumhead  2  through the sucker members  20 . The result is that the sound generated by the vibration of the drumhead  2  increases. Moreover, due to the vibration of the drumhead  2 , the sucker members  20  may be detached from the drumhead  2  easily. 
     In contrast to the above, by disposing the buffer body  32  at a position corresponding to a position struck by the beater  4 , the impact applied to the struck head portion  30  when the beater  4  strikes the struck head portion  30  can be buffered by the cushion portion  33 . Thus, the sound generated by the vibration of the drumhead  2  can be reduced. In addition, detachment of the sucker members  20  from the drumhead  2  can also be prevented. 
     Besides, the foot pedal  3  is usually used in a state of being fixed to the bass drum  1 . Therefore, a striking position on the struck body  10  which is struck by the beater  4  held by the foot pedal  3  is substantially consistent. For this reason, if the struck head portion  30  does not have the buffer body  32  attached thereon, the impact caused by the striking of the beater  4  may be concentrated on a portion of the struck head portion  30  when the struck head portion  30  is struck by the beater  4 . Hence, only the mesh material, located at the portion of the struck head portion  30  where the striking is concentrated, becomes easily extended. In other words, the durability of the struck head portion  30  is reduced.
 
In contrast, the buffer body  32  is attached to the struck head portion  30  of the struck body  10 . Hence, the impact applied to the struck head portion  30  can be dispersed. Consequently, the durability of the struck head portion  30  is improved.
 
     Furthermore, in the state that the drum silencer  100  is installed to the drumhead  2 , the hard body  34  is disposed facing the beater  4  to be struck by the beater  4  during the performance. 
     Therefore, the beater  4  can be prevented from sinking deep into the buffer body  32 . Accordingly, a sag in the cushion portion  33  can be suppressed. The restoring force of the struck head portion  30  can also be utilized easily. As a result, the feel approximating to the striking feeling of actually striking the drumhead  2  can be obtained. The hard body  34  connected with the cushion portion  33  is struck. Accordingly, abrasion of the cushion portion  33 , resulting from direct striking on the cushion portion  33 , can be prevented. 
     Further, the buffer body  32  is attached to the struck head portion  30  and the hard body  34  of the buffer body  32  is struck by the beater  4 . Accordingly, a collision due to the striking can be buffered by the cushion portion  33  connected with the hard body  34  and the struck head portion  30  to which the cushion portion  33  is attached. Thus, in comparison with directly striking on the struck head portion  30 , the drum silencer  100  of the present invention can further reduce the sound (attack noise) generated by the striking. 
     The frame portion  40  is an annular member formed of a resin material. By forming the frame portion  40  using the resin material, the frame portion  40  can be made lighter in comparison with using a metal material to form the frame portion  40 . 
     Here, in the struck body  10 , the frame portion  40  is fixed to the circumferential portion of the struck head portion  30  by insert-molding the struck head portion  30  in which tension is applied to the resin material that forms the frame portion  40 . 
     Thus, a mechanism for fixing the struck head portion  30  to the frame portion  40  can be omitted. The mechanism refers to a tension bolt for connecting the struck head portion  30  and the frame portion  40 , and an internal thread structure for screwing the tension bolt, etc. Accordingly, the struck body  10  can be made lighter. 
     Moreover, the struck head portion  30  is fixed to the frame portion  40  with tension applied thereon. Thus, the beater  4  can be pushed back by the restoring force of the struck head portion  30  that is struck and pressed by the beater  4 . In this way, the feel of striking the struck body  10  can be similar to the striking feeling of striking the drumhead  2 . 
     A vibration sensor  60 , formed of a piezoelectric actuator, is disposed to adhere to a lower surface side (the paper front side of  FIG. 2B ) of the frame portion  40 . Therefore, with the drum silencer  100  installed to the bass drum  1 , the bass drum  1  can be used as an electronic drum. 
     Further, recesses  41 , adapted for accommodating elastic members  50  that are described later, are formed at four positions along a circumferential direction on the lower surface side (the lower side of  FIG. 3 ) of the frame portion  40 . 
     The sucker members  20  are suckers for sucking the struck body  10  onto the drumhead  2  (see  FIG. 1 ). The sucker members  20  are respectively connected with the recesses  41  formed in the frame portion  40  through the elastic members  50 . 
     Here, in this embodiment, four sucker members  20  are disposed on the frame portion  40 . However, three or fewer or five or more sucker members  20  may be disposed. 
     By disposing three or more sucker members  20  along the circumferential direction of the frame portion  40 , the struck body  10  can be installed to the drumhead  2  stably. Therefore, when the struck body  10  is struck, the struck body  10  can be prevented from tilting to touch the drumhead  2 . 
     The elastic members  50  are members for buffering the impact transmitted from the struck body  10  to the sucker members  20 . The elastic members  50  are respectively formed of a rubbery elastic body. The frame portion  40  and the sucker members  20  are connected through the elastic members  50 . Thus, the impact of the struck body  10  that comes with the striking of the beater  4  (see  FIG. 1 ) can be buffered. Accordingly, the impact of the struck body  10  can be suppressed from transmitting to the drumhead  2  by the sucker members  20 . Hence, the sound generated by the vibration of the drumhead  2  can be reduced. In addition, detachment of the sucker members  20  from the drumhead  2  can also be prevented. 
     The struck body  10  is sucked to the drumhead  2  by the sucker members  20 . Thus, a negative pressure is utilized to keep the drum silencer  100  and the drumhead  2  in close contact. In this way, the drumhead  2  can vibrate with the struck body  10  while a contact area between the drum silencer  100  and the drumhead  2  is suppressed. Therefore, the vibration of the struck body  10  that is struck can be transmitted to the drumhead  2 , and hindrance to free vibration of the drumhead  2  caused by the striking can be suppressed. 
     In addition, the struck body  10  remains attached to the drumhead  2  due to a suction force provided by the sucker members  20 . Therefore, in comparison with the case where the entire struck body  10  is in close contact with the drumhead  2 , the contact area between the struck body  10  and the drumhead  2  in the present invention can be suppressed. Hence, hindrance to free vibration of the drumhead, resulting from contact with the sucker members  20 , can be suppressed. 
     Furthermore, the struck head portion  30  is formed of the mesh material and the frame portion  40  is formed of the resin material, and the struck head portion  30  and the frame portion  40  are formed integrally by insert-molding. Thus, the struck body  10  can be made lighter. By doing so, attenuation of the vibration of the drumhead  2 , caused by the weight of the struck body  10 , can be suppressed. Hence, hindrance to free vibration of the drumhead  2  can also be suppressed. In other words, when the struck body  10  is struck, the tone specific to the bass drum  1  can be retained. 
     Besides, the impact of the struck body  10  that comes with the striking of the beater  4  can be buffered by the struck head portion  30 , the cushion portion  33 , and the elastic members  50 . Therefore, the impact transmitted to the drumhead  2  through the sucker members  20  can be reduced. Accordingly, the volume of the tone generated by the vibration of the drumhead  2  can be lowered. Further, a collision sound (attack noise) that occurs when the struck body  10  is struck can be reduced. Accordingly, cancellation of the tone generated by the vibration of the drumhead  2  due to the collision sound can be suppressed. 
     Like this, the volume of the tone that occurs with the vibration of the drumhead  2  can be lowered and the collision sound that comes with the striking of the struck head portion  30  can be reduced. Accordingly, the tone specific to the bass drum  1  can be brought out. In other words, a sound approximating to the tone generated by directly striking the drumhead  2  can be produced predominantly. 
     Moreover, the struck body  10  and the drumhead  2  are connected through the sucker members  20 . Therefore, in comparison with the case where the struck body  10  and the drumhead  2  are attached by using an adhesive tape, etc., a process of attaching and detaching the struck body  10  can be simplified. Further, in comparison with the case where the struck body  10  is connected with the bass drum  1  with use of a bolt, etc., the process of attaching and detaching the struck body  10  can be simplified. 
     The second embodiment is explained hereinafter. The first embodiment illustrates a situation where the buffer body  32  is attached to the struck head portion  30 , and the frame portion  40  and the sucker members  20  are connected through the elastic members  50 . In the second embodiment, however, the buffer body  32  is omitted. In addition, in the second embodiment, the frame portion  40  and sucker members  220  are connected directly. The same reference numerals are used to denote components the same as the previous embodiment. Thus, detailed descriptions thereof are not repeated hereinafter. 
     First, a usage example of a drum silencer  200  according to the second embodiment is described with reference to  FIG. 4 .  FIG. 4  is a schematic perspective view of a snare drum  201  with the drum silencer  200  attached thereon according to the second embodiment. 
     As shown in  FIG. 4 , the snare drum  201  is an acoustic percussion instrument adapted to be struck with a stick, etc. The snare drum  201  can generate a tone specific to the snare drum  201  by striking a drumhead  202  with a stick, etc. 
     The drum silencer  200  is a device adapted to be attached to the drumhead  202  for reducing the percussive sound generated during the performance. The drum silencer  200  mainly includes a struck body  210  and sucker members  220 . 
     Next, a detailed configuration of the drum silencer  200  is described with reference to  FIG. 5A  and  FIG. 5B .  FIG. 5A  is a schematic top view of the drum silencer  200 .  FIG. 5B  is a schematic cross-sectional view of the drum silencer  200  along the line Vb-Vb of  FIG. 5A . 
     As shown in  FIG. 5A  and  FIG. 5B , the drum silencer  200  includes a struck head portion  230  and the frame portion  40 . The struck head portion  230  and the frame portion  40  are formed integrally by insert-molding. In addition, the sucker members  220  are directly connected with the recesses  41  of the frame portion  40 . Further, an annular rim portion  242 , formed of a rubbery elastic body, is attached to the upper surface side of the frame portion  40  (the upper side of  FIG. 5B ). 
     The rim portion  242  is a portion adapted to be struck when the performer performs a rim shot. By striking the rim portion  242  during the rim shot, the generated sound (attack noise) can be reduced. 
     Here, the drum silencer  100  (see  FIG. 1 ) of the first embodiment is installed on the bass drum  1  that is struck by the beater  4  rotating with the stamp on the foot pedal  3 . Moreover, in the drum silencer  100  (see  FIG. 2A ,  FIG. 2B , and  FIG. 3 ) of the first embodiment, the buffer body  32  including the cushion portion  33  and the elastic members  50  are disposed, besides the struck head portion  30  formed of the mesh material, to serve as the configuration for buffering the impact on the struck body  10 . On the other hand, in comparison with the drum silencer  100  of the first embodiment, the impact and vibration applied to the drumhead  202  of the snare drum  201  that is struck by the stick are smaller. For this reason, if the drum silencer  100  of the first embodiment is installed to the snare drum  201 , the vibration of the struck body  10  may be attenuated excessively and may not be sufficiently transmitted to the drumhead  202 . In other words, the specific tone of the snare drum may hardly be produced. 
     In contrast to the drum silencer  100  of the first embodiment, in the drum silencer  200  of the second embodiment, the buffer body  32  and the elastic members  50  are omitted, and the impact applied on the struck body  210  is attenuated by the struck head portion  30 . Therefore, while the impact of the striking is suppressed from transmitting from the struck body  210  to the drumhead  202 , the vibration of the struck body  210  can be easily transmitted to the drumhead  202 . 
     In addition, by omitting the buffer body  32  and the elastic members  50 , the struck body  210  can be made lighter correspondingly. Thus, attenuation of the vibration of the drumhead  202 , caused by the weight of the struck body  210 , can be suppressed. Hence, hindrance to free vibration of the drumhead  202  can also be suppressed. Therefore, when the struck body  210  is struck, the tone specific to the snare drum  201  can be retained. 
     The vibration sensor  60  may also be disposed to adhere to the lower surface side (the lower side of  FIG. 5B ) of the frame portion  40 . With the drum silencer  200 , provided with the vibration sensor  60 , attached to the snare drum  201 , the snare drum  201  can be used as an electronic drum. 
     Hereinafter, the third embodiment is described with reference to  FIG. 6A ,  FIG. 6B ,  FIG. 7A , and  FIG. 7B . The first and the second embodiments illustrate a situation where the struck head portions  30  and  230  are formed integrally with the frame portion  40  by insert-molding. In the third embodiment, however, a struck head portion  330  and a frame portion  340  are formed individually. The same reference numerals are used to denote components the same as the previous embodiment. Thus, detailed descriptions thereof are not repeated hereinafter. 
       FIG. 6A  is a schematic top view of a drum silencer  300  according to the third embodiment.  FIG. 6B  is a schematic cross-sectional view of the drum silencer  300  along the line VIb-VIb of  FIG. 6A .  FIG. 7A  is a schematic bottom view of the drum silencer  300 .  FIG. 7B  is a partially enlarged view of the VIIb section of the drum silencer  300  of  FIG. 7A . To simplify the illustration and to make the description more comprehensible,  FIG. 7B  depicts a part of a sucker member  320 , a part of a sucker support portion  340   d , and a hole  340   e  with broken lines. 
     As shown in  FIG. 6A  and  FIG. 6B , the drum silencer  300  includes a struck body  310  and sucker members  320 . The sucker members  320  are detachably connected with the struck body  310 . Except the configuration for attaching the sucker members  320  to a lower frame portion  340   b  that is to be described later, the struck body  310  has the same configuration as the drum previously developed by the applicants of the present invention and filed as a patent application (Japanese Patent Application No. 2013-084682). 
     The struck body  310  mainly includes a struck head portion  330 , a frame portion  340 , a fixing bolt  343 , a plurality of contact plates  344 , and a tension ring  345 . The struck head portion  330  includes a membrane portion  331   a  formed of a stretchable mesh material, and a fixing portion  331   b  fixed to a circumferential portion of the membrane portion  331   a . The frame portion  340  includes an upper frame portion  340   a  and the lower frame portion  340   b  that hold the fixing portion  331   b . Besides, the frame portion  340  has an annular shape. The fixing bolt  343  is used to fix the fixing portion  331   b  to the frame portion  340 . The contact plates  344  are configured to displace in a radial direction with respect to the frame portion  340 . The contact plates  344  apply tension to the membrane portion  331   a  when being displaced inward in the radial direction. The tension ring  345  is disposed on outer circumferential surfaces of these contact plates  344 . Moreover, the tension ring  345  has a shape of an open loop. A rim portion  342 , formed of a rubbery elastic body, is attached to an upper surface side of the upper frame portion  340   a.    
     The membrane portion  331   a  is stretched to be installed on a struck head support portion  340   c  that protrudes from the lower frame portion  340   b . Tension is applied to the membrane portion  331   a  when the tension ring  345  is tightened. 
     That is, when a pair of coupling members  346  respectively formed at two end portions of the tension ring  345  along the circumferential direction are screwed and coupled to each other by a connection bolt  347 , an inner diameter of the tension ring  345  is shortened. By doing so, the contact plates  344  are pressed by an inner circumferential surface of the tension ring  345  to displace inward in the radial direction. Moreover, the membrane portion  331   a  is placed on an upper end portion (end portion on the upper side of  FIG. 6B ) of the struck head support portion  340   c . Further, the fixing portion  331   b  that is fixed to the circumferential portion of the membrane portion  331   a  is fixed to the frame portion  340 . Thus, as the contact plates  344  are displaced inward in the radial direction, a portion of the membrane portion  331   a  located at an outer circumferential side of the struck head support portion  340   c  is pulled downward. Accordingly, tension is applied to the membrane portion  331   a.    
     Therefore, by adjusting a tightening amount of the tension ring  345 , the tension of the membrane portion  331   a  can be adjusted properly to obtain the striking feeling the performer prefers. 
     Here, the sucker support portions  340   d , which protrude inward in the radial direction, are formed on the lower frame portion  340   b  at four positions equally spaced along the circumferential direction of the lower frame portion  340   b . The holes  340   e  having a long circular shape are drilled to penetrate the sucker support portions  340   d  respectively and extend along the radial direction of the lower frame portion  340   b . In addition, the sucker members  320  are respectively locked to the holes  340   e.    
     The sucker member  320  is formed of an elastic material. Moreover, the sucker member  320  is configured to be detachable from the lower frame portion  340   b . The sucker member  320  includes a suction portion  321  and a locking portion  322 . The suction portion  321  is configured as a sucker for sucking the drumhead  202  (see  FIG. 4 ) of the snare drum  201 . The locking portion  322  is connected with a surface of the suction portion  321 , which is opposite to a surface by which the suction portion  321  is sucked to the drumhead  202 . 
     The locking portion  322  is a portion locked to the sucker support portion  340   d . The locking portion  322  includes large diameter portions  323  and a small diameter portion  324 . The large diameter portions  323  are a pair of portions, having a disc shape and facing each other. The small diameter portion  324  connects surfaces of the pair of large diameter portions that face each other. In addition, the small diameter portion  324  has an outer diameter smaller than an outer diameter of the large diameter portion  323 . The pair of large diameter portions  323  and the small diameter portion  324  are disposed concentrically to form a substantially H shape (see  FIG. 6B ). 
     When installing the sucker member  320  to the lower frame portion  340   b , the large diameter portion  323  located on the side opposite to the suction portion  321  with respect to the small diameter portion  324  is pressed into the hole  340   e  from the lower side (the lower side of  FIG. 6B ) of the sucker support portion  340   d  such that the large diameter portion  323  protrudes on the upper surface side of the lower frame portion  340   b . Accordingly, the locking portion  322  is locked to the lower frame portion  340   b.    
     Here, an interval between the pair of large diameter portions  323  facing each other is set to be slightly smaller than the thickness of the lower frame portion  340   b  (dimensions in the vertical direction of  FIG. 6B ). In addition, the outer diameter of the small diameter portion  324  is set to be slightly larger than the width of the hole  340   e  (dimensions in the vertical direction of  FIG. 7B ). 
     Accordingly, the sucker support portion  340   d  can be held by the elastically deformed large diameter portions  323 . Therefore, the locking portion  322  can be securely fixed to the sucker support portion  340   d . Moreover, the small diameter portion  324  can be elastically deformed to be held by the inner circumferential surface of the hole  340   e . Therefore, the locking portion  322  can be securely fixed to the sucker support portion  340   d.    
     Further, the hole  340   e  has the long circular shape with a longitudinal direction consistent with the radial direction of the lower frame portion  340   b . Hence, a locking position of the sucker member  320  can be adjusted along the radial direction of the frame portion  340 . 
     Here, the membrane portion  331   a  is stretched and disposed on the upper end surface of the struck head support portion  340   c , and vibratability differs between a central portion of the membrane portion  331   a  and a portion close to the upper end portion of the struck head support portion  340   c . Moreover, by adjusting a suction position of the sucker member  320  in the radial direction of the drumhead  202  (see  FIG. 4 ), a position at which vibration is transmitted from the sucker member  320  to the drumhead  202  when the struck body  310  is struck is changed. As a result, the tone of the snare drum  201  (see  FIG. 4 ) that is generated by the vibration of the drumhead  202  can be varied. 
     Furthermore, the vibration sensor  60  may also be disposed to adhere to the lower surface side (the lower side of  FIG. 6B ) of the frame portion  40 . With the drum silencer  300 , provided with the vibration sensor  60 , attached to the snare drum  201 , the snare drum  201  can be used as an electronic drum. 
     The above illustrates the present invention on the basis of the exemplary embodiments. However, it should be understood that the invention is not limited to any of the exemplary embodiments, and various modifications or alterations may be made without departing from the spirit of the present invention. 
     For example, the above embodiments illustrate a situation of using the drum silencer  100  of the first embodiment on the bass drum  1 . Moreover, the drum silencers  200  and  300  of the second and third embodiments are used on the snare drum  201 . However, the present invention is not limited thereto. The drum silencer  100  of the first embodiment may also be used on a drum other than the bass drum  1 . In addition, the drum silencers  200  and  300  of the second and third embodiments may also be used on a drum other than the snare drum  201 . 
     The first and second embodiments illustrate a situation where the frame portion  40  of the struck body  10  and  210  is fixed to the circumferential portion of the struck head portion  30  formed of the mesh material. However, the present invention is not limited thereto. The frame portion  40  may also be fixed to the circumferential portion of a struck head portion that is formed of a material other than the mesh material, such as a film-like, sponge-like, or rubber-like member, for example. 
     The above embodiments illustrate a situation where the frame portions  40  and  340  are formed of the resin material. However, the present invention is not limited thereto. The frame portion may be formed using a material other than the resin material, such as a metal material, for example.