Composite material violoncello backboard

Abstract

The utility model discloses a composite material cello backboard, comprising a body, a panel, a reinforcing member and a composite member. The utility model has the beneficial effects that the movable block is driven by the connecting rod to move towards the direction of the positioning groove, so that the locking block is gradually opened by the cambered surface on the outer side of the separating block, the locking block is separated from the inner side of the positioning groove, the connecting block loses the limit, the body is pulled out backwards, and the disassembly can be completed; it can be guaranteed that the back plate is not damaged during disassembly; the structural strength of the backboard is enhanced by arranging the reinforcing ribs, deflection deformation of the backboard can be reduced, structural fatigue or cracking caused by too large vibration amplitude can be avoided, when the cello backboard bears longitudinal tension of strings, the reinforcing fibers can prevent the backboard from tensile deformation, the damping layer can reduce the vibration amplitude of the cello during playing, and the service life of the cello is prolonged. Howling or noise is avoided, the structural strength of the back plate is effectively enhanced, and it is guaranteed that the back plate cannot deform in long-term use.

Description

Technical Field

[0001] This utility model relates to the field of cello technology, and in particular to a composite material cello backplate. Background Technology

[0002] The cello is an indispensable tenor or bass string instrument in the orchestra, and the cello back plate is an important component. The back plate is usually installed on the back of the cello, and most cello back plates are made of wood. In the case of existing composite cello back plates, during the use of the cello, the tension of the strings is transmitted to the back plate through the bridge and soundpost under the continuous action of the strings. However, some composite back plates do not take into account the importance of the back plate strength in the design and do not have protective measures. This can lead to the back plate deforming after long-term use, affecting the playing effect. Moreover, when the modal frequency deviation between the top plate and the back plate exceeds the design threshold, resulting in an unbalanced tone, it is necessary to disassemble and readjust. Usually, the top plate and the back plate are glued together. Disassembly requires heating to soften the glue and using a blade to separate the two. Using tools such as blades and heat guns may damage the back plate. At the same time, the process is cumbersome and time-consuming, reducing the convenience of disassembling the back plate. Utility Model Content

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0004] In view of the problems existing in the above and / or existing composite cello back plates, this utility model is proposed.

[0005] Therefore, the problem this utility model aims to solve is that in the use of existing composite material cello back plates, during cello playing, the continuous tension of the strings is transmitted to the back plate through the bridge and soundpost. However, some composite material back plates, due to the lack of consideration for the importance of back plate strength in their design and the absence of protective measures, can lead to deformation of the back plate during long-term use, affecting the playing effect. Furthermore, when the modal frequency deviation between the top and back plates exceeds the design threshold, resulting in tone imbalance, disassembly and readjustment are required. Usually, the top and back plates are glued together, and disassembly requires heating to soften the glue and using a blade to separate them. Using tools such as blades and heat guns may damage the back plate, and the process is cumbersome and time-consuming, reducing the ease of disassembly.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a composite material cello backplate, comprising a main body assembly, including a body, a panel, a reinforcing member, and a composite member. The panel is disposed on one side of the body, the reinforcing member is disposed on the outer side of the body, the composite member is disposed on the inner wall of the body, and a connecting assembly is disposed on the inner side of the main body assembly, including a fixing seat, a connecting block, a positioning member, a rotating member, a resetting member, a fixing member, an adjusting member, a separating member, and an elastic member. The fixing seat is fixed to the inner wall of the panel, the connecting block is fixed to one side of the body, the positioning member is disposed on the outer side of the body, the rotating member is disposed on the inner side of the fixing seat, the resetting member is disposed on the outer side of the rotating member, the fixing member is disposed on the outer side of the connecting block, the adjusting member is disposed on the inner wall of the body, the separating member is disposed on the outer side of the adjusting member, and the elastic member is disposed on the inner side of the separating member.

[0007] As a preferred embodiment of the composite material cello backplate of this utility model, the reinforcing member includes a bumper strip and a reinforcing rib. The bumper strip is installed on the outer side of the body, and the reinforcing rib is fixed to the inner wall of the body.

[0008] As a preferred embodiment of the composite material cello backplate of this utility model, the composite material includes reinforcing fibers and a damping layer, wherein the reinforcing fibers are disposed on the inner wall of the body and the damping layer is disposed on one side of the reinforcing fibers.

[0009] As a preferred embodiment of the composite material cello backplate of this utility model, the positioning component includes a positioning block and a connecting seat. The positioning block is fixed to one side of the main body, and the connecting seat is fixed to the inner wall of the panel. The outer side of the positioning block is engaged with the inner wall of the connecting seat.

[0010] In a preferred embodiment of the composite material cello backplate of this utility model, the rotating component includes a rotating shaft and a fixing rod, the rotating shaft rotating inside the fixing seat and the fixing rod fixed outside the rotating shaft.

[0011] In a preferred embodiment of the composite material cello backplate of this utility model, the reset component includes a torsion spring and a limiting bracket, wherein the torsion spring is disposed on the outside of the rotating shaft and the limiting bracket is disposed at both ends of the torsion spring.

[0012] As a preferred embodiment of the composite material cello backplate of this utility model, the fixing member includes a locking block and a positioning groove. The locking block is fixed to the outside of the fixing rod, and the positioning groove is opened on the inside of the connecting block.

[0013] In a preferred embodiment of the composite material cello backplate of this utility model, the adjusting component includes a handle, an adjusting rod, and a connecting rod. The adjusting rod slides on the inner wall of the body, the handle rotates at one end of the adjusting rod, and the connecting rod is fixed at the other end of the adjusting rod.

[0014] In a preferred embodiment of the composite material cello backplate of this utility model, the separating component includes a movable block and a separating block, wherein the movable block is fixed to one end of the connecting rod and the separating block is fixed to one side of the movable block.

[0015] In a preferred embodiment of the composite material cello backplate of this utility model, the elastic element includes a guide rod and a spring. The guide rod is fixed to the inner wall of the connecting block, and the spring is sleeved on the outer side of the guide rod. The outer side of the guide rod is slidably connected to the inner wall of the movable block.

[0016] The beneficial effects of this utility model are as follows: the connecting rod drives the movable block to move towards the positioning groove, causing the outer arc surface of the separating block to gradually open the locking block, causing it to disengage from the inner side of the positioning groove. The connecting block then loses its limit and can be pulled out of the main body to complete the disassembly. This achieves disassembly without the need for tools, ensuring that the back plate will not be damaged during disassembly. The disassembly and assembly steps are simple, improving the convenience of disassembling the back plate. The anti-collision strip protects the main body, ensuring that its corners will not be damaged in the event of an impact. The reinforcing ribs are used to strengthen the structural strength of the back plate, which can reduce the deflection deformation of the back plate and avoid structural fatigue or cracking due to excessive vibration amplitude. When the cello back plate is subjected to the longitudinal tension of the strings, the reinforcing fiber can prevent the back plate from being stretched and deformed, while the damping layer can reduce the vibration amplitude of the cello during playing and avoid whistling or noise. This effectively enhances the structural strength of the back plate and ensures that it will not deform during long-term use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is a structural diagram of the composite material cello backplate.

[0019] Figure 2 Another perspective view of the overall structure of the composite material cello backplate.

[0020] Figure 3 This is a cross-sectional structural diagram of the panel of a composite material cello backplate.

[0021] Figure 4 This is a structural diagram of a composite material cello backplate.

[0022] Figure 5 This is a structural diagram of the fasteners for a composite material cello backplate.

[0023] The diagram is labeled as follows: 10. Main component; 11. Body; 12. Panel; 13. Reinforcing component; 131. Anti-collision strip; 132. Reinforcing rib; 14. Composite component; 141. Reinforcing fiber; 142. Damping layer; 20. Connecting component; 21. Fixing base; 22. Connecting block; 23. Positioning component; 231. Positioning block; 232. Connecting base; 24. Rotating component; 241. Rotating shaft; 242. Fixing rod; 25. Reset component; 251. Torsion spring; 252. Limiting frame; 26. Fixing component; 261. Locking block; 262. Positioning groove; 27. Adjusting component; 271. Handle; 272. Adjusting rod; 273. Connecting rod; 28. Separating component; 281. Movable block; 282. Separating block; 29. ​​Elastic component; 291. Guide rod; 292. Spring. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0027] Example 1

[0028] Reference Figures 1-5 This is the first embodiment of the present invention. This embodiment provides a composite material cello back plate. The composite material cello back plate includes a main body component 10 and a connecting component 20. The main body component 10 increases the structural strength of the back plate, and the connecting component 20 facilitates the installation or disassembly of the back plate.

[0029] The main component 10 includes a body 11, a panel 12, a reinforcing member 13, and a composite member 14. The panel 12 is disposed on one side of the body 11, the reinforcing member 13 is disposed on the outer side of the body 11, and the composite member 14 is disposed on the inner wall of the body 11.

[0030] The main body 11 is used, which is a metaphor for the back plate of a cello; the panel 12 is connected to the main body 11 to form a closed resonance cavity, and a sealing gasket is provided at the connection between the panel 12 and the main body 11; the composite part 14 enhances the performance of the back plate.

[0031] The connecting component 20 is located inside the main body component 10 and includes a fixed base 21, a connecting block 22, a positioning component 23, a rotating component 24, a resetting component 25, a fixing component 26, an adjusting component 27, a separating component 28, and a spring component 29. The fixed base 21 is fixed to the inner wall of the panel 12, the connecting block 22 is fixed to one side of the main body 11, the positioning component 23 is located on the outer side of the main body 11, the rotating component 24 is located inside the fixed base 21, the resetting component 25 is located outside the rotating component 24, the fixing component 26 is located outside the connecting block 22, the adjusting component 27 is located on the inner wall of the main body 11, the separating component 28 is located outside the adjusting component 27, and the spring component 29 is located inside the separating component 28.

[0032] The fixing member 26 can be used to form a fixed connection between the fixing base 21 and the connecting block 22; the separating member 28 can be used to remove the fixing member 26 from limiting the connecting block 22; the elastic member 29 can be used to reset the separating member 28 after it moves.

[0033] Example 2

[0034] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0035] Specifically, the reinforcing member 13 includes a crash bar 131 and a reinforcing rib 132. The crash bar 131 is installed on the outside of the body 11, and the reinforcing rib 132 is fixed to the inner wall of the body 11.

[0036] The anti-collision strip 131 is made of rubber and is fixed to the outside of the body 11 to protect the body 11 and ensure that its edges and corners are not damaged in the event of an impact. The reinforcing rib 132 is used to strengthen the structural strength of the back plate. For example, when the cello back plate vibrates, the reinforcing rib 132 can reduce the deflection deformation of the back plate and avoid structural fatigue or cracking due to excessive vibration amplitude. At the same time, it can disperse the concentrated load transmitted by the cello sound column and prevent cracks from appearing in this area.

[0037] Specifically, the composite component 14 includes reinforcing fibers 141 and a damping layer 142. The reinforcing fibers 141 are disposed on the inner wall of the body 11, and the damping layer 142 is disposed on one side of the reinforcing fibers 141.

[0038] The reinforcing fiber 141 is composed of carbon fiber and basalt fiber, and has high modulus and high strength characteristics. It can significantly improve the tensile and compressive properties of the body 11. When the cello back plate is subjected to the longitudinal tension of the strings, the reinforcing fiber 141 can prevent the back plate from being tensile deformed. Moreover, through the bridging effect of the fibers, the reinforcing fiber 141 can improve the shear strength between the composite material layers and avoid delamination failure. The damping layer 142 is made of nitrile rubber. Through the friction of the molecular chains inside the material, the mechanical vibration energy is converted into heat energy, thereby reducing the resonance peak. For example, at the first bending mode frequency of the cello back plate, the damping layer 142 can reduce the vibration amplitude and avoid howling or noise.

[0039] Example 3

[0040] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0041] Specifically, the positioning component 23 includes a positioning block 231 and a connecting seat 232. The positioning block 231 is fixed on one side of the body 11, and the connecting seat 232 is fixed on the inner wall of the panel 12. The outer side of the positioning block 231 is engaged with the inner wall of the connecting seat 232.

[0042] After the positioning block 231 slides into the inner side of the connecting seat 232, the fixing seat 21 and the connecting block 22 can complete the initial docking, and the movement path of the connecting block 22 is restricted, so that the body 11 and the panel 12 can complete the precise connection.

[0043] Specifically, the rotating component 24 includes a rotating shaft 241 and a fixed rod 242. The rotating shaft 241 rotates inside the fixed seat 21, and the fixed rod 242 is fixed to the outside of the rotating shaft 241.

[0044] When the fixed rod 242 is pushed by an external force, it will rotate around the pivot 241 along the inner side of the fixed base 21.

[0045] Specifically, the reset component 25 includes a torsion spring 251 and a limiting bracket 252. The torsion spring 251 is located on the outside of the rotating shaft 241, and the limiting bracket 252 is located at both ends of the torsion spring 251.

[0046] The rebound force generated by the torsion spring 251 enables the rotating shaft 241 to rotate and complete the reset. There are two limit brackets 252, which are set on both sides of the torsion spring 251 to limit the two ends of the torsion spring 251 and improve its stability.

[0047] Specifically, the fastener 26 includes a locking block 261 and a positioning groove 262. The locking block 261 is fixed to the outside of the fixing rod 242, and the positioning groove 262 is opened on the inside of the connecting block 22.

[0048] The locking block 261 is shaped like an unequal-sided triangle. The shape of the inner side of the positioning groove 262 corresponds to that of the locking block 261. When the locking block 261 is inserted into the inner side of the positioning groove 262, it will cause the fixing seat 21 and the connecting block 22 to form a fixed connection.

[0049] Specifically, the adjusting component 27 includes a handle 271, an adjusting rod 272, and a connecting rod 273. The adjusting rod 272 slides on the inner wall of the body 11, the handle 271 rotates at one end of the adjusting rod 272, and the connecting rod 273 is fixed to the other end of the adjusting rod 272.

[0050] Specifically, the separating component 28 includes a movable block 281 and a separating block 282. The movable block 281 is fixed to one end of the connecting rod 273, and the separating block 282 is fixed to one side of the movable block 281.

[0051] As the movable block 281 moves along with the connecting rod 273, it will move synchronously with the separating block 282. The outer side of the separating block 282 is provided with an arc surface, which is used to open the locking block 261 and disengage it from the inner side of the positioning groove 262.

[0052] Specifically, the elastic element 29 includes a guide rod 291 and a spring 292. The guide rod 291 is fixed to the inner wall of the connecting block 22, and the spring 292 is sleeved on the outer side of the guide rod 291. The outer side of the guide rod 291 is slidably connected to the inner wall of the movable block 281.

[0053] Spring 292 is used to push movable block 281 to return to its original position by the accumulated elastic force after the movable block 281 has moved, while guide rod 291 is used to improve the stability of the movement of spring 292 and movable block 281.

[0054] When connecting the main body 11 and the panel 12 during use, first align the positioning block 231 with the inner side of the insertion connector 232 to complete the initial connection. Then, gradually close the main body 11 and the panel 12. As the connecting block 22 moves, when it reaches the locking block 261, the inclined surface at one end of the connecting block 22 gradually opens the locking block 261 and the fixing rod 242 to rotate around the pivot 241. When the connecting block 22, with the positioning groove 262, reaches below the locking block 261, the torsion spring 251 uses its elasticity to cause the pivot 241 to drive the fixing rod 242 to return to its original position. Subsequently, the locking block 261 is engaged with the inner side of the positioning groove 262, and the fixing seat 21 and the connecting block 22 are then connected. To complete the installation of the back panel and establish a fixed connection, when it is necessary to disassemble the back panel, first remove the handle 271 from the bracket and rotate it to align it with the axis of the adjusting rod 272. Then, push the handle 271 forward, which will drive the movable block 281 to move towards the positioning groove 262 via the connecting rod 273. As the movable block 281 moves, it will also move the separating block 282 synchronously. As it moves, the outer arc surface of the separating block 282 will gradually open the locking block 261, causing it to disengage from the inner side of the positioning groove 262. The connecting block 22 will then lose its limit. Next, pull the body 11 out backward to separate the positioning block 231 from the connecting seat 232, thus completing the disassembly.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A composite material cello backplate, characterized in that: include, The main body component (10) includes a body (11), a panel (12), a reinforcing member (13), and a composite member (14). The panel (12) is disposed on one side of the body (11), the reinforcing member (13) is disposed on the outer side of the body (11), and the composite member (14) is disposed on the inner wall of the body (11). The connecting component (20), located inside the main body component (10), includes a fixing seat (21), a connecting block (22), a positioning component (23), a rotating component (24), a resetting component (25), a fixing component (26), an adjusting component (27), a separating component (28), and a spring component (29). The fixing seat (21) is fixed to the inner wall of the panel (12), the connecting block (22) is fixed to one side of the main body (11), the positioning component (23) is located on the outer side of the main body (11), the rotating component (24) is located inside the fixing seat (21), the resetting component (25) is located outside the rotating component (24), the fixing component (26) is located outside the connecting block (22), the adjusting component (27) is located on the inner wall of the main body (11), the separating component (28) is located outside the adjusting component (27), and the spring component (29) is located inside the separating component (28).

2. The composite material cello backplate as described in claim 1, characterized in that: The reinforcing member (13) includes a crash bar (131) and a reinforcing rib (132). The crash bar (131) is installed on the outside of the body (11), and the reinforcing rib (132) is fixed to the inner wall of the body (11).

3. The composite material cello backplate as described in claim 1, characterized in that: The composite (14) includes reinforcing fibers (141) and a damping layer (142), wherein the reinforcing fibers (141) are disposed on the inner wall of the body (11) and the damping layer (142) is disposed on one side of the reinforcing fibers (141).

4. The composite material cello backplate as described in claim 1, characterized in that: The positioning component (23) includes a positioning block (231) and a connecting seat (232). The positioning block (231) is fixed to one side of the body (11), and the connecting seat (232) is fixed to the inner wall of the panel (12). The outer side of the positioning block (231) is engaged with the inner wall of the connecting seat (232).

5. The composite material cello backplate as described in claim 1, characterized in that: The rotating component (24) includes a rotating shaft (241) and a fixing rod (242). The rotating shaft (241) rotates inside the fixing seat (21), and the fixing rod (242) is fixed to the outside of the rotating shaft (241).

6. The composite material cello backplate as described in claim 5, characterized in that: The reset component (25) includes a torsion spring (251) and a limiting bracket (252). The torsion spring (251) is disposed on the outside of the rotating shaft (241), and the limiting bracket (252) is disposed at both ends of the torsion spring (251).

7. The composite material cello backplate as described in claim 5, characterized in that: The fastener (26) includes a locking block (261) and a positioning groove (262). The locking block (261) is fixed to the outside of the fixing rod (242), and the positioning groove (262) is opened on the inside of the connecting block (22).

8. The composite material cello backplate as described in claim 1, characterized in that: The adjusting component (27) includes a handle (271), an adjusting rod (272), and a connecting rod (273). The adjusting rod (272) slides on the inner wall of the body (11), the handle (271) rotates at one end of the adjusting rod (272), and the connecting rod (273) is fixed at the other end of the adjusting rod (272).

9. The composite material cello backplate as described in claim 8, characterized in that: The separating component (28) includes a movable block (281) and a separating block (282). The movable block (281) is fixed to one end of the connecting rod (273), and the separating block (282) is fixed to one side of the movable block (281).

10. The composite material cello backplate as described in claim 9, characterized in that: The elastic element (29) includes a guide rod (291) and a spring (292). The guide rod (291) is fixed to the inner wall of the connecting block (22), and the spring (292) is sleeved on the outer side of the guide rod (291). The outer side of the guide rod (291) is slidably connected to the inner wall of the movable block (281).

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