Patent Application
20180204548
The present invention relates to a fastening device, a drum hoop fastening device and a drum having the same.
Conventionally, a drum has a drum shell which is hollow, a drumhead covering two opening ends of the drum shell respectively and a drum hoop covering the drumhead and the drum shell, and an exterior periphery of the drum shell has a plurality of connecting portions. A user can adjust a tightness of the drumhead through adjusting a position of the drum hoop covering the drum shell. A plurality of bolts are respectively disposed through a plurality of through holes of the drum hoop and screwed with the connecting portions, the user can screw and move relative positions of the bolts and the connecting portions to change the position of the drum hoop and further to adjust the tightness of the drumhead so as to adjust a sound and a tune produced when the drumhead is hit.
However, the drum vibrates when being hit, the drum hoop of the drum contacts the bolts; therefore, when the drum vibrates, the drum hoop transmits a seismic wave produced to the bolts so that the bolts loosen and shake easily. After the bolts loosen, the drumhead get loose, and the sound and the tune of the drum change, so the bolts of the conventional drum need to repeatedly adjusted. In addition, fastening members of machines, such as audio equipment or machine tools, may also get loose due to vibration.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The major object of the present invention is to provide a fastening device, a drum hoop fastening device and a drum having the same which can effectively prevent the fastening device from loosening due to the vibration produced when an object (the drum) vibrates.
To achieve the above and other objects, a drum hoop fastening device is provided. The drum hoop fastening device is for being disposed on a drum, the drum includes a drum shell, a drumhead arranged on the drum shell, a drum hoop covering an opening end of the drum shell and the drumhead and a first connecting portion arranged on the drum hoop, an exterior circumferential wall of the drum shell has a second connecting portion, the first connecting portion has a first through hole along an axial direction, the second connecting portion has a connecting hole along the axial direction, and the drum hoop fastening device includes a fixing member and a fastening member. The fixing member is positioned in one of the first through hole and the connecting hole, and the fixing member has a second through hole along the axial direction. The fastening member is disposed through the first and second through holes and screwed with the connecting hole for fixing the drum hoop on the drum shell, and when the fastening member rotates, an exterior circumferential wall of the fastening member circumferentially interferes the fixing member.
To achieve the above and other objects, a drum is further provided, including a plurality of the drum hoop fastening devices mentioned above, and the drum further includes a drum shell, at least one drumhead, at least one drum hoop and at least one first connecting portion. An exterior circumferential wall of the drum shell has a plurality of second connecting portions. The at least one drumhead is arranged on the drum shell. The at least one drum hoop covers an opening end of the drumhead and the drum shell. Each said first connecting portion having a first through hole along an axial direction
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
Please refer to
The fixing member 1 is positioned in one of the first through hole 941 and the connecting hole 951, and the fixing member 1 has a second through hole 11 along the axial direction. In this embodiment, the fixing member 1 is located in the first through hole 941.
The fastening member 2 is disposed through the first and second through holes 941, 11 and screwed with the connecting hole 951 for fixing the drum hoop 93 on the drum shell 91, and when the fastening member 2 rotates, an exterior circumferential wall of the fastening member 2 circumferentially interferes the fixing member 1.
The fastening member 2 sequentially has a head portion 21 for driving, a middle section 23 and a threaded section 24, at least one part of the middle section 23 is located in the second through hole 11, during every rotation of the fastening member 2 within the second through hole 11, the middle section 23 of the fastening member 2 circumferentially interferes a wall of the second through hole 11, and at least one of a circumferential wall of the middle section 23 and the wall of the second through hole 11 is radially recoverably deformable. When the fastening member 2 rotates, the exterior circumferential wall of the fastening member 2 circumferentially interferes the fixing member 1; therefore, when the drum 9 is hit and vibrates, the fastening member 2 can be prevented from being vibrated and rotating randomly relative to the fixing member 1, and the fastening member 2 will not fall off from the drum hoop 93.
At least one of the circumferential wall of the middle section 23 and the wall of the second through hole 11 is non-circular. Preferably, both the middle section 23 and the wall of the second through hole 11 are non-circular (not limited thereto) so that the fastening member 2 and the fixing member 1 can preferably interfere with each other. In this embodiment, the middle section 23 is a polygonal column (in this embodiment, the middle section 23 is a quadrangular column).
Specifically, the first through hole 941 is preferably a non-circular hole (in this embodiment, the first through hole 941 is a rectangular hole), the fixing member 1 sequentially has an abutting section 12, a non-circular section 13 and an interfering section 14, and the non-circular section 13 is located in the first through hole 941 and corresponds to the first through hole 941 in shape (rectangular) to prevent the fixing member 1 from rotating in the first through hole 941. In this embodiment, a restricting portion 22 which has greater diameter relative to the head portion 21 is further provided between the head portion 21 and the middle section 23, and the restricting portion 22 abuts the abutting section 12 axially against the first connecting portion 94 so that the fastening member 2 can stably fix the drum hoop 93 on the drum shell 91. It is understandable that in other embodiments, the fixing member 1 can be positioned in the connecting hole 951, and the exterior circumferential wall of the fastening member 2 can still circumferentially interfere with the fixing member 1 so as to effectively prevent the fastening member 2 from rotating randomly relative to the fixing member 1.
It is to be noted that in this embodiment, the interfering section 14 has a plurality of petals 141 which are radially flareable and recoverable, every two of the plurality of petals 141 form a through slot 142, the through slots 142 extend along the axial direction, the middle section 23 is located in the interfering section 14, and when the fastening member 2 rotates, the middle section 23 circumferentially interferes the petals 141. Therefore, when the drum 9 is hit and vibrates, the middle section 23 circumferentially interferes the petals 141, the fastening member 2 will not rotate relative to the fixing member 1 and will not move axially, and it is more convenient for a user to screw the fastening member 22 to adjust sounds of the drum 9 when being hit. When the user wants to make the fastening member 2 and the fixing member 1 rotate relative to each other, s/he can apply a greater force to make the middle section 23 abut against the petals 141 to make the petals 141 deform, and then the fastening member 2 can rotate relative to the fixing member 1 to adjust a tightness of the fastening member 2. It is understandable that in other embodiments, the middle section and the interfering section may be in other structures, for example, at least one of the middle section and the interfering section may have at least one rib sheet which extend radially to make the middle section circumferentially interfere the interfering section to prevent the fastening member from loosening.
In this embodiment, the head portion 21, the middle section 23 and the threaded section 24 are integrally formed in one piece, and the abutting section 12, the non-circular section 13 and the interfering section 14 are integrally formed in one piece, but not limited thereto. Preferably, the fastening member 2 is a metal bolt, and the fixing member 1 is a metal cushion so that the fastening member 2 and the fixing member 1 have greater structural strength to elevate durability of the fastening member 2 and the fixing member 1.
In the present invention, the drum 9 is further provided, including the drum hoop fastening device mentioned above, and the drum 9 further includes the drum shell 91, at least one said drumhead 92, at least one said drum hoop 93 and at least one said first connecting portion 94. The exterior circumferential wall of the drum shell 91 has a plurality of said second connecting portions 95. The at least one drumhead 92 is arranged on the drum shell 91. The at least one drum hoop 93 covers the opening end of the drumhead 92 and the drum shell 91. Each said first connecting portion 94 has the first through hole 941 along the axial direction. In this embodiment, the drum 9 includes two said drumheads 92, two said drum hoops 93 and a plurality of said first connecting portions 94, the two drum hoops 93 and the two drumheads 92 are respectively arranged on two opposite opening ends of the drum shell 91, and the first connecting portions 94 are respectively arranged on the two drum hoops 93.
Each said second connecting portion 95 further has at least one connecting tube 96, each said connecting tube 96 extends toward one said drum hoop 93, and each said connecting tube 96 is screwed with one said fastening member 2. When the fastening member 2 rotates, the middle section 23 of each said fastening member 2 circumferentially interferes with the fixing member 1 so as to prevent the fastening members 2 from loosening due to vibration of the drum 9.
Please refer to
Given the above, in the fastening device, the drum hoop fastening device and the drum having the same, when the fastening member rotates, the exterior circumferential wall of the fastening member circumferentially interferes with the fixing member to prevent the fastening member from rotating randomly relative to the fixing member. In addition, when the user wants to make the fastening member and the fixing member rotate relative to each other, s/he can apply a greater force to make the middle section abut against the petals to make the petals deform, and then the fastening member can rotate relative to the fixing member to adjust a tightness of the fastening member.
While we have shown and described various embodiments in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
