A musical instrument that combines art and education

Abstract

This application relates to a musical instrument that combines craftsmanship and teaching, belonging to the technical field of musical instrument teaching aids. It includes a body and a pair of bridges for string support. The body includes a main soundboard and a soundboard located at one end of the main soundboard. The soundboard is angled. A first locking strip and a first locking groove are respectively provided on the opposite side of the main soundboard and the soundboard, with the first locking groove for the first locking strip to be inserted and engaged. A pair of legs, which cooperate with the soundboard, are provided at the end of the main soundboard away from the soundboard. The pair of bridges are located at both ends of the top of the main soundboard, with a second locking strip at the bottom of the bridges. A second locking groove is provided on the top of the body for the second locking strip to be inserted and engaged. This application, by providing mutually cooperating locking grooves and strips, enables convenient assembly and disassembly of the main structures of the guzheng or guqin, thus effectively facilitating teachers' demonstration of the guzheng or guqin's structural components. Furthermore, the guzheng or guqin can also be used as a decorative craft when assembled.

Description

Technical Field

[0001] This application relates to the field of musical instrument teaching aids, and in particular to a musical instrument that combines craftsmanship and teaching. Background Technology

[0002] The guzheng and guqin are traditional Chinese musical instruments from ancient times.

[0003] Beginners of guzheng and guqin need to have a basic understanding of their structure when they first start learning. However, the existing teaching guzheng and guqin are large in size and their parts are fixedly connected, making them inconvenient to disassemble and assemble. This makes it difficult for teachers to demonstrate the structure of the guzheng or guqin, and there is room for improvement. Summary of the Invention

[0004] In order to facilitate the easy assembly and disassembly of the guzheng or guqin, and thus make it easier for teachers to demonstrate the structure of the guzheng or guqin, this application provides a musical instrument that combines craftsmanship and teaching.

[0005] The musical instrument combining craftsmanship and teaching functions provided in this application adopts the following technical solution:

[0006] A musical instrument combining craftsmanship and teaching functions includes a body and a pair of bridges for stringing. The body includes a main soundboard and a soundboard located at one end of the main soundboard. The soundboard is inclined. A first locking strip and a first locking groove are respectively provided on the opposite side of the soundboard and the main soundboard. The first locking groove is used for the first locking strip to be inserted and engaged. A pair of legs are provided on the side of the main soundboard away from the soundboard for use with the soundboard. The pair of bridges are located at both ends of the top of the main soundboard. A second locking strip is provided at the bottom of the bridge. A second locking groove is provided on the top of the body for the second locking strip to be inserted and engaged.

[0007] By adopting the above technical solution and setting up interlocking slots and clips, the main structures of the guzheng or guqin can be easily disassembled and assembled. This effectively facilitates the teaching staff in demonstrating the composition of the guzheng or guqin, and the guzheng or guqin can also be used as a decorative craft when assembled.

[0008] Optionally, the bottom of the first slot has a plurality of sliding holes evenly arranged along its length. The sliding holes are elongated and distributed along the length of the first slot. A locking strip is vertically inserted into the sliding hole and is horizontally slidably connected to the sliding hole. The bottom of the first slot has a plurality of sliding grooves for the locking strip to pass through sequentially. The sliding grooves are perpendicular to the sliding holes. The bottom of the first slot also has a plurality of locking grooves evenly arranged along its length, which are sequentially connected to the sliding grooves and perpendicular to the sliding grooves. The locking grooves are used for the locking strip to be embedded and slidably engaged.

[0009] By adopting the above technical solution, when connecting the main soundboard and the amplifier board, the first locking strip is first embedded in the first slot. At this time, the locking strip passes through the sliding groove and slides along the groove to its inner side. Then, the locking strip is controlled to slide along the sliding hole, where it is embedded in the locking groove and slides along the groove to its inner side, thereby locking the connection between the first locking strip and the first slot, thus ensuring a stable connection between the main soundboard and the amplifier board. By setting a simple and stable locking mechanism, the locking of the connection between the first locking strip and the first slot is achieved, thereby effectively ensuring the stability of the connection between the main soundboard and the amplifier board.

[0010] Optionally, the bottom of the main soundboard is provided with a drive groove that communicates with multiple sliding holes, and a drive plate that is slidably connected to multiple locking strips is provided in the drive groove, and the bottom of the drive plate is provided with anti-slip texture.

[0011] By adopting the above technical solution and setting a drive board connected to multiple locking bars, the synchronous sliding drive of multiple locking bars is realized, which facilitates locking the connection status of the main soundboard and the amplifier board.

[0012] Optionally, a zigzag-shaped spring sheet is provided at one end of the drive groove, and the spring sheet is used to drive the locking bar to slide and embed into the locking groove.

[0013] By adopting the above technical solution and setting a spring sheet, the connection between the locking block and the locking groove is ensured, thereby effectively ensuring the normal working state of the locking block.

[0014] Optionally, the top of the support leg is provided with a third locking strip, and the bottom of the main body is provided with a third locking groove for the third locking strip to be inserted and engaged.

[0015] By adopting the above technical solution and setting up a third locking strip and a third locking slot that cooperate with each other, the legs and the main soundboard can be easily disassembled and assembled.

[0016] Optionally, the support leg includes an upper support and a lower support that are hinged to each other. The upper support and the lower support are respectively provided with a first mounting groove and a second mounting groove along their length on the side away from the amplifier board. A first mounting block and a second mounting block are slidably connected in the first mounting groove and the second mounting groove, respectively. A support rod is provided between the first mounting block and the second mounting block, and the two ends of the support rod are respectively hinged to the first mounting block and the second mounting block. When the lower support is deflected to the side away from the amplifier board, the first mounting block abuts against the top of the first mounting groove.

[0017] By adopting the above technical solution, when connecting the support legs and the main soundboard, the third locking strip first embeds into the third locking groove. Then, during the contact between the lower support member and the supporting surface, the lower support member deflects away from the soundboard. At this time, the first mounting block and the second mounting block slide upwards along the first mounting groove and the second mounting groove, respectively. When the first mounting block touches the top of the first mounting groove, the position of the lower support member is fixed. Thus, the inclined lower support member supports the main soundboard, ensuring the stability of the instrument's main body. By setting a deflectable and foldable support leg, in conjunction with the soundboard, an inclined support for the main soundboard is achieved, effectively ensuring the stability of the instrument's main body.

[0018] Optionally, the support rod is provided with an auxiliary rod, and the auxiliary rod includes a tube and a rod. The tube is hinged to the support rod and located below the support rod. The rod passes through the tube and is slidably connected to the tube. An adjusting sleeve is rotatably connected to the lower end of the tube, and the adjusting sleeve is threadedly connected to the rod. The lower support is provided with a snap-fit ​​groove for the lower end of the rod to be inserted and snapped.

[0019] By adopting the above technical solution, when supporting the lower support, the lower end of the rod is first inserted into the locking groove, and then the adjusting sleeve is rotated to make the lower end of the rod abut against the bottom of the locking groove, thereby supporting the lower support. By setting an adjustable auxiliary rod to connect the upper support and the support rod, stable support for the lower support in its working state is achieved, thus effectively ensuring the stability of the lower support in its working state.

[0020] Optionally, the snap-fit ​​groove is polygonal, and the lower end of the rod is provided with a polygonal snap-fit ​​block that matches the snap-fit ​​groove. The snap-fit ​​groove is used for the snap-fit ​​block to be inserted and snapped in.

[0021] By adopting the above technical solution, and by setting up polygonal snap-fit ​​grooves and polygonal snap-fit ​​blocks that work in conjunction with them, the sliding limit of the rod body is achieved, making it easier for staff to adjust the length of the support rod.

[0022] Optionally, the Yue Shan is provided with a pair of auxiliary plates distributed on both sides thereon. The cross-section of the auxiliary plates is inverted L-shaped and the pair of auxiliary plates are arranged opposite to each other. The top of the main piano plate is provided with a groove for the auxiliary plates to be inserted and snapped into.

[0023] By adopting the above technical solution, and by setting an auxiliary seat plate and a groove for its cooperation, the connection strength between the bridge and the main soundboard is improved, thereby effectively ensuring the stability of the connection between the bridge and the main soundboard.

[0024] Optionally, the bottom of the second card strip and the bottom of the auxiliary plate are both tapered from top to bottom.

[0025] By adopting the above technical solution, and by setting a second clip and an auxiliary plate arranged in a tapering shape at the bottom, it is convenient to install the bridge and the auxiliary plate on the main soundboard.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] By setting up interlocking slots and clips, the main structures of the guzheng or guqin can be easily disassembled and assembled, which effectively facilitates the teaching staff to demonstrate the composition of the guzheng or guqin. Furthermore, the guzheng or guqin can also be used as a decorative craft when assembled.

[0028] By setting a simple and stable locking mechanism, the connection state of the first card bar and the first card slot is locked, thereby effectively ensuring the stability of the connection state between the main soundboard and the soundboard.

[0029] By incorporating tiltable and foldable support legs, along with a soundboard, the main soundboard is tilted and supported, effectively ensuring the stability of the instrument's main body. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0031] Figure 2 This is a schematic diagram of the connection between the main soundboard and the support legs in Embodiment 1 of this application.

[0032] Figure 3 This is a schematic diagram of the overall structure in Embodiment 2 of this application.

[0033] Figure 4 This is a schematic diagram of the connection between the first card strip and the first card slot in Embodiment 2 of this application.

[0034] Figure 5 This is a schematic diagram showing the connection between the main soundboard and the amplification board in Embodiment 2 of this application.

[0035] Figure 6 This is a schematic diagram of the connection between the legs and the main soundboard in Embodiment 2 of this application.

[0036] Figure 7 yes Figure 6 A magnified view of a portion of region A in the middle.

[0037] Explanation of reference numerals in the attached diagram: 1. Body; 11. Main soundboard; 111. First slot; 1111. Sliding hole; 112. Second slot; 113. Drive groove; 1131. Drive plate; 11311. Anti-slip texture; 1132. Spring plate; 114. Groove; 12. Amplifying plate; 121. First locking strip; 1211. Sliding groove; 1212. Locking groove; 13. Third slot; 2. Yueshan (bridge); 21. 22. Second locking bar; 3. Auxiliary plate; 4. String; 5. Support leg; 6. Third locking bar; 7. Upper support; 8. First mounting slot; 9. First mounting block; 10. Lower support; 11. Second mounting slot; 12. Second mounting block; 13. Snap-fit ​​slot; 14. Locking bar; 15. Support rod; 16. Auxiliary rod; 17. Tube body; 18. Adjusting sleeve; 19. Rod body; 10. Snap-fit ​​block. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the accompanying drawings.

[0039] Example 1:

[0040] Embodiment 1 of this application discloses a musical instrument that combines craftsmanship and teaching.

[0041] Reference Figure 1 A musical instrument that combines craftsmanship and teaching, comprising a body 1 and a pair of bridges 2. The main body 1 is used to support the bridges 2, and the pair of bridges 2 are distributed at both ends of the main body 1, with the bridges 2 used to support the strings 3.

[0042] Reference Figure 1 The main body 1 includes a main soundboard 11 and a soundboard 12, both of which are hollow. The soundboard 12 is located at one end of the main soundboard 11 and is inclined. The upper end of the soundboard 12 is used to abut against the main soundboard 11, and the lower end of the soundboard 12 is used to abut against the support surface. At the same time, a pair of legs 4 are provided at the bottom of the main soundboard 11 opposite to the soundboard 12, so as to support the main body 1 through the soundboard 12 and the legs 4.

[0043] Reference Figure 1 The main body 1 has a first slot 111 along its length on one end face near the amplification board 12, and the first slot 111 extends through both sides of the main body 1. The amplification board 12 has a first clip 121 along its length on the upper end face. The first slot 111 is used for the first clip 121 to be inserted and snapped in, so as to realize the convenient assembly and disassembly of the main body 1 and the amplification board 12.

[0044] Reference Figure 1 , Figure 2The bottom of the main body 1 is provided with third slots 13 on both sides away from the first slot 111. The top of the support legs 4 is provided with third clips 41. The third slots 13 are used for the third clips 41 to be inserted and snapped in, so as to realize the convenient assembly and disassembly of the main body 1 and the support legs 4.

[0045] Reference Figure 1 , Figure 2 The main body 1 has a second slot 112 at both ends of the top. The second slot 112 extends through both sides of the main body 1. The bottom of the bridge 2 has a second clip 21 along its length. The second slot 112 is used for the second clip 21 to be inserted and snapped in, so as to realize the convenient assembly and disassembly of the main body 1 and the amplification board 12.

[0046] The implementation principle of a musical instrument that combines craftsmanship and teaching in this application embodiment is as follows: when assembling the main body of the instrument, the assembly of the main body of the instrument can be completed by simply inserting the first locking strip 121 and a pair of second locking strips 21 into the first locking slot 111 and a pair of second locking slots 112 in sequence.

[0047] When disassembling the instrument body, simply disengage the second locking strip 21 and the first locking strip 121 from the second locking slot 112 and the first locking slot 111 in sequence to complete the disassembly of the instrument body.

[0048] Example 2:

[0049] Embodiment 2 of this application discloses a musical instrument that combines craftsmanship and teaching, which differs from Embodiment 1 in that: (Refer to...) Figure 3 , Figure 4 and Figure 5 The bottom of the first slot 111 is provided with a plurality of sliding holes 1111 evenly arranged along its length direction. The sliding holes 1111 are all elongated and distributed along the length direction of the first slot 111. A locking strip 5 is vertically inserted into the sliding hole 1111 and is horizontally slidably connected to the sliding hole 1111 along its length direction. The bottom of the first locking strip 121 is provided with a plurality of sliding grooves 1211 evenly arranged along its length direction. The sliding grooves 1211 are elongated and perpendicular to the sliding holes 1111. When the first locking strip 121 is inserted into the first slot 111, the plurality of sliding grooves 1211 are connected to one end of the plurality of sliding holes 1111 in sequence so that the locking strip 5 can slide through. Meanwhile, the bottom of the first locking strip 121 is uniformly provided with multiple locking grooves 1212 along its length. The locking grooves 1212 are elongated and perpendicular to the slide groove 1211. The multiple locking grooves 1212 are connected to the ends of the multiple locking grooves 1212 away from the main body 1. The locking grooves 1212 are used for the locking strip 5 to be inserted and slid and locked. The connection state of the first locking strip 121 and the first locking groove 111 is locked by the cooperation of the locking strip 5 and the locking groove 1212, so as to ensure the connection stability of the main body 1 and the amplification board 12.

[0050] Therefore, when connecting the main soundboard 11 and the amplifier board 12, the first locking strip 121 is first embedded into the locking block 721 in the first locking groove 111. At this time, the locking strip 5 slides along the sliding groove 1211 to the point where the sliding groove 1211 and the locking groove 1212 are connected. Then, the locking strip 5 is driven to slide along the locking hole. At this time, the locking strip 5 slides and locks into the locking groove 1212, thereby locking the connection state of the first locking strip 121 and the first locking groove 111, and thus achieving a stable connection between the main soundboard 11 and the amplifier board 12.

[0051] Reference Figure 5 The bottom of the main soundboard 11 is provided with a drive groove 113, which is connected to multiple sliding holes 1111. A drive plate 1131 is horizontally slidably connected within the drive groove 113. The drive plate 1131 is connected to multiple locking bars 5, so that the multiple locking bars 5 can be driven to slide synchronously through the drive plate 1131. At the same time, anti-slip textures 11311 are evenly provided along the length direction of the bottom of the drive plate 1131 to control the sliding of the drive plate 1131.

[0052] Reference Figure 5 A spring plate 1132 is provided at one end of the drive groove 113. The spring plate 1132 is arranged in a zigzag shape and is used to drive the locking bar 5 to slide along the sliding hole 1111, thereby causing the locking bar 5 to slide and engage in the locking groove 1212.

[0053] Reference Figure 3 and Figure 4 Auxiliary plates 22 are provided on both sides of the lower end of Yue Shan 2. The cross-section of the auxiliary plates 22 is inverted L-shaped, and a pair of auxiliary plates 22 are arranged opposite each other. The top of the main soundboard 11 is provided with grooves 114 distributed on both sides of the second snap-fit ​​groove 432. The grooves 114 are used for the auxiliary plates 22 to be inserted and snap-fit, so as to support Yue Shan 2 through the auxiliary plates 22, thereby ensuring the connection stability of Yue Shan 2 and main soundboard 11. At the same time, the bottom of the auxiliary plates 22 and the second snap-fit ​​strip is gradually tapered from top to bottom, so as to embed the auxiliary plates 22 and the second snap-fit ​​strip into the grooves 114 and the second snap-fit ​​grooves 112.

[0054] Reference Figure 6The support leg 4 includes an upper support 42 and a lower support 43, with the top of the lower support 43 and the bottom of the upper support 42 hinged to each other. The upper support 42 and the lower support 43 are respectively provided with a first mounting groove 421 and a second mounting groove 431 along their length direction on the side away from the soundboard 12. A first mounting block 4211 is slidably connected in the first mounting groove 421, and a second mounting block 4311 is slidably connected in the second mounting groove 431. A support rod 6 is provided between the first mounting block 4211 and the second mounting block 4311, with both ends of the support rod 6 hinged to the first mounting block 4211 and the second mounting block 4311, respectively. When the lower support 43 is deflected to the side away from the soundboard 12 and used to support the main soundboard 11, the first mounting block 4211 abuts against the top of the first mounting groove 421, so as to achieve stable support for the main soundboard 11 through the cooperation of the soundboard 12 and the support leg 4.

[0055] Reference Figure 7 An auxiliary rod 7 is hinged to the support rod 6. The auxiliary rod 7 is located below the support rod 6 and includes a tube body 71 and a rod body 72. The rod body 72 is located below the tube body 71 and passes through the tube body 71. The rod body 72 and the tube body 71 are slidably connected. An adjusting sleeve 711 is rotatably connected to the lower end of the tube body 71. The adjusting sleeve 711 and the rod body 72 are threadedly connected so that the length of the rod body 72 passing through the tube body 71 can be adjusted by adjusting the adjusting sleeve 711.

[0056] Reference Figure 7 The lower support 43 is provided with a snap-fit ​​groove 432 at the top. The snap-fit ​​groove 432 is polygonal, and the bottom of the rod 72 is provided with a polygonal snap-fit ​​block 721 that matches the snap-fit ​​groove 432. The snap-fit ​​groove 432 is used for the snap-fit ​​block 721 to be inserted and snapped in, so as to realize the connection between the support rod 6 and the support leg 4 through the auxiliary rod 7, thereby enhancing the structural strength of the support leg 4. At the same time, it can also limit the sliding of the rod 72 so as to adjust the length of the rod 72 passing through the tube 71.

[0057] Therefore, when connecting the support leg 4 and the main soundboard 11, the third locking strip 41 is first inserted into the third locking groove 13. Then, during the process of the lower support 43 and the supporting surface abutting, the lower support 43 deflects away from the amplification plate 12. At this time, the first mounting block 4211 and the second mounting block 4311 slide upward along the first mounting groove 421 and the second mounting groove 431 respectively, so that the position of the lower support 43 is fixed. Then, the length of the auxiliary rod 7 is adjusted so that the rod body 72 and the lower support 43 abut against each other, thereby using the inclined lower support 43 to support the main soundboard 11, realizing the connection between the support leg 4 and the main soundboard 11 and cooperating with the amplification plate 12 to achieve a stable connection of the main soundboard 11.

[0058] The implementation principle of a musical instrument that combines craftsmanship and teaching in this application embodiment is as follows: When assembling the main body of the instrument, firstly, the first locking strip 121 is inserted into the first locking slot 111 and the connection state of the first locking strip 121 and the first locking slot 111 is locked by the locking strip 5. Then, a pair of second locking strips 21 are inserted into a pair of second locking slots 112, and the assembly of the main body of the instrument is completed.

[0059] When disassembling the instrument body, simply disconnect the pair of second locking strips 21 from the pair of second locking slots 112, then release the locking strip 5 from the locking state of the first locking strip 121, and then disconnect the first locking strip 121 from the first locking slot 111 to complete the disassembly of the instrument body.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A collection of art and teaching musical instruments, characterized in that: The instrument includes a body (1) and a pair of bridges (2) for mounting the strings (3). The body (1) includes a main soundboard (11) and a soundboard (12) distributed at one end of the main soundboard (11). The soundboard (12) is inclined. A first locking strip (121) and a first locking groove (111) are respectively provided on the side opposite to the main soundboard (11). The first locking groove (111) is used for the first locking strip (121) to be inserted and locked. The main soundboard (11) is provided with a pair of legs (4) that cooperate with the soundboard (12) at the end away from the soundboard (12). The pair of bridges (2) are distributed at both ends of the top of the main soundboard (11). A second locking strip (21) is provided at the bottom of the bridge (2). A second locking groove (112) is provided at the top of the body (1) for the second locking strip (21) to be inserted and locked. The top of the support leg (4) is provided with a third locking strip (41), and the bottom of the main piano board (11) is provided with a third locking groove (13) for the third locking strip (41) to be inserted and locked. The support leg (4) includes an upper support (42) and a lower support (43) that are hinged to each other. The upper support (42) and the lower support (43) are respectively provided with a first mounting groove (421) and a second mounting groove (431) along their length direction on the side away from the amplifier board (12). A first mounting block (4211) and a second mounting block (4311) are slidably connected in the first mounting groove (4211) and the second mounting block (4311). A support rod (6) is provided between the first mounting block (4211) and the second mounting block (4311). The two ends of the support rod (6) are respectively hinged to the first mounting block (4211) and the second mounting block (4311). When the lower support (43) deflects to the side away from the amplifier board (12), the first mounting block (4211) abuts against the top of the first mounting groove (421).

2. The collection of art and teaching musical instrument according to claim 1, wherein: The bottom of the first slot (111) is uniformly provided with a plurality of sliding holes (1111) along its length direction. The sliding holes (1111) are elongated and distributed along the length direction of the first slot (111). A locking strip (5) is vertically inserted into the sliding hole (1111) and the locking strip (5) is horizontally slidably connected to the sliding hole (1111). The bottom of the first slot (121) is provided with a plurality of sliding grooves (1211) for the locking strip (5) to pass through sequentially. The sliding grooves (1211) are perpendicular to the sliding holes (1111). The bottom of the first slot (121) is also uniformly provided with a plurality of locking grooves (1212) that are sequentially connected to the sliding grooves (1211) and perpendicular to the sliding grooves (1211). The locking grooves (1212) are used for the locking strip (5) to be embedded and slidably engaged.

3. The collection of art and teaching musical instrument of claim 2, wherein: The bottom of the main soundboard (11) is provided with a drive groove (113) that communicates with a plurality of sliding holes (1111), and a drive plate (1131) that is connected to a plurality of locking bars (5) is slidably connected in the drive groove (113), and the bottom of the drive plate (1131) is provided with anti-slip texture (11311).

4. The collection of art and teaching musical instrument of claim 3, wherein: A zigzag-shaped spring sheet (1132) is provided at one end of the drive groove (113), and the spring sheet (1132) is used to drive the locking bar (5) to slide and embed into the locking groove (1212).

5. The collection of art and teaching musical instrument of claim 1, wherein: An auxiliary rod (7) is provided on the support rod (6), and the auxiliary rod (7) includes a tube body (71) and a rod body (72). The tube body (71) is hinged to the support rod (6) and located below the support rod (6). The rod body (72) passes through the tube body (71) and is slidably connected to the tube body (71). An adjusting sleeve (711) is rotatably connected to the lower end of the tube body (71), and the adjusting sleeve (711) and the rod body (72) are threadedly connected. A snap-fit ​​groove (432) is provided on the lower support member (43) for the lower end of the rod body (72) to be inserted and snapped.

6. The collection of art and teaching musical instrument of claim 5, wherein: The snap-fit ​​groove (432) is polygonal, and the lower end of the rod (72) is provided with a polygonal snap-fit ​​block (721) that matches the snap-fit ​​groove (432). The snap-fit ​​groove (432) is used for the snap-fit ​​block (721) to be embedded and snapped.

7. The collection of art and teaching musical instrument of claim 1, wherein: The Yue Shan (2) is provided with a pair of auxiliary plates (22) distributed on both sides of it. The cross section of the auxiliary plates (22) is inverted L-shaped and the pair of auxiliary plates (22) are arranged opposite to each other. The top of the main piano plate (11) is provided with a groove (114) for the auxiliary plates (22) to be inserted and snapped.

8. The collection of art and teaching musical instrument of claim 7, wherein: The bottom of the second card strip (21) and the bottom of the auxiliary plate (22) are both tapered from top to bottom.

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