A portable foldable piano tipping device and a tipping method thereof
By designing a portable folding piano overturning device, the support folding mechanism and overturning insertion components are used to solve the safety hazards and the cumbersome machine handling problems during piano flipping, and the convenient, safe flip and stable support of the piano is achieved.
Patent Information
- Application Number
- CN202210579712.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-05-26
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2042-05-26
AI Technical Summary
In the prior art, pianos need to be flipped during maintenance, which poses safety risks, and larger flip machines cannot enter the home room and are cumbersome to carry.
A portable folding piano overturning device is designed, including a piano side plate support, a support folding mechanism, a turnover insertion assembly, an active sliding mechanism and a driven sliding mechanism. Through the locking connection supporting the folding mechanism and the rotation of the threaded locking member, convenient flipping and stable support of the piano are achieved.
This device can flip the piano safely and stably, reduce safety risks, and eliminate the need for manual handling of larger flip machines, simplify operation, and is suitable for widespread promotion.
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Figure CN114927116B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of piano tipping, and in particular to a portable foldable piano tipping device and a tipping method thereof. Background Art
[0002] The piano is a keyboard instrument in Western classical music. CN208570087U discloses an upright piano with multiple functions. The item slot is provided with a desiccant placed inside, which can absorb moisture inside the upright piano panel, reduce the influence of air humidity on the piano tone, and make the entire upright piano more practical. The data processor provided, combined with the data storage device, can automatically compare the sound emitted by the piano keys with the tone emitted by the normal piano keys, so that people can understand the condition of the piano and use the piano conveniently. The glass mirror provided can facilitate people to practice their own posture when playing the piano, realize the multi-function of the upright piano, and meet people's use requirements. However, there are many problems in the use of the upright piano: due to the heavy weight of the upright piano, the piano tuner needs to manually flip it when repairing the bottom of the piano, installing and replacing parts, and repairing the paint on the side, which poses a great safety hazard. The piano can also be flipped by a large flipping machine, but its structure is complicated. The flipping machine cannot enter the room of the piano placed in the home, and the flipping machine is extremely cumbersome to carry. Therefore, it is urgent for those skilled in the art to design a new type of piano flipping device. Summary of the invention
[0003] The problem to be solved by the present invention is to effectively support the piano back and the whole piano through the piano side panel support part, and the supporting effect is excellent. The support frames of the support and folding mechanism are locked and connected, and the support and folding mechanism can play the role of supporting the piano side panel support part and the piano from below the piano side panel support part. At the same time, by rotating and tightening the threaded locking part, the support and folding mechanism can open the overall support or the threaded locking part can be rotated and loosened to fold the support and folding mechanism. It is extremely simple and convenient to carry, and can be put down in the trunk of an ordinary car. It can be operated by one person, and the support is stable, which can effectively solve the problem of turning over a large turning machine to turn over the piano and put it in The turning machine cannot enter the piano indoors at home, and the turning machine is extremely cumbersome to carry. By inserting the pin turning bend of the turning plug assembly deep into the bottom of the piano, the piano side panel support part slowly sticks to the back of the piano, so that the entire bottom and side of the piano can be clearly seen after the piano is turned over, and the piano tuner starts to repair and replace parts from the front, which is convenient for the piano tuner to repair the bottom of the piano, install and replace parts, and repair the paint on the side. The structural design is simple and reasonable, and there is no need to manually carry the piano or a large turning machine to turn it over, which greatly reduces the safety hazard. The portable foldable piano turning device and the turning method thereof are suitable for widespread promotion.
[0004] In order to solve the above problems, the present invention provides a portable foldable piano tipping device, including a piano side panel support part, a support and folding mechanism, a tipping plug-in assembly, an active sliding mechanism and a driven sliding mechanism. The piano side panel support part is a split support structure, and the two ends of the piano side panel support part are respectively sleeved on the support and folding mechanism, and the support frames of the support and folding mechanism are locked. An active sliding mechanism is provided at one end of the support and folding mechanism, and a driven sliding mechanism is provided at the bottom side end of the support and folding mechanism. The driven sliding mechanism is relatively transmitted with the active sliding mechanism, and a tipping plug-in assembly is provided at the side end of the support and folding mechanism, and the tipping plug-in assembly is plugged into the bottom of the piano.
[0005] Preferably, the piano side panel support part includes a first piano side panel support assembly and a second piano side panel support assembly, and the first piano side panel support assembly and the second piano side panel support assembly both include a primary longitudinal support rod and a secondary longitudinal support rod, and a transverse support rod is fixed between the primary longitudinal support rod and the secondary longitudinal support rod.
[0006] Preferably, the bottom of the primary longitudinal support rod and the secondary longitudinal support rod are fixed with limit sleeves, the first piano side panel support assembly also includes a positioning clamp and a handle seat, the bottom of the primary longitudinal support rod and the secondary longitudinal support rod are fixed with positioning clamps, and a handle seat is provided between the positioning clamps.
[0007] Preferably, the supporting and folding mechanism comprises a primary supporting bracket, a secondary supporting bracket, a tertiary supporting bracket and a fourth supporting bracket, the primary supporting bracket and the secondary supporting bracket are cross-arranged, the central parts of the primary supporting bracket and the secondary supporting bracket are rotationally separated connected via a threaded locking piece, the tail end of the primary supporting bracket is abutted against the front end of the tertiary supporting bracket and are rotationally separated connected via a threaded locking piece, the front end of the secondary supporting bracket is abutted against the front end of the fourth supporting bracket and are rotationally separated connected via a threaded locking piece, and the tail end of the fourth supporting bracket is rotationally separated connected to the central part of the tertiary supporting bracket via a threaded locking piece.
[0008] Preferably, a support clamp rod is provided at the side end of the four-stage support bracket, and the support clamp rod is provided at the lower end of the primary longitudinal support rod and the secondary longitudinal support rod and is sleeved on the limit clamp sleeve.
[0009] Preferably, the tip-over plug-in assembly comprises a tip-over limit clamp tube and a pin tip-over bend tube, wherein the tip-over limit clamp tube is fixedly arranged at the lower end of the three-stage support bracket, and a pin tip-over bend tube inclined upward is arranged at the bottom end of the tip-over limit clamp tube, and the pin tip-over bend tube is plugged into the bottom of the piano.
[0010] Preferably, the active sliding mechanism comprises a positioning support seat, an active pulley and a brake hub, the positioning support seat is fixedly arranged at the lower end of the secondary support bracket, an active pulley is installed under the positioning support seat, and a brake hub is installed on the active pulley.
[0011] Preferably, the driven sliding mechanism includes a connecting bracket, a positioning sleeve, a synchronous transmission shaft and a driven wheel. The connecting bracket is fixed between the three-level supporting brackets. A positioning sleeve is fixed at the lower end of the connecting bracket. The synchronous transmission shaft is sleeved on the positioning sleeve and extends to both ends to connect with the driven wheel.
[0012] Preferably, the tipping method of the portable foldable piano tipping device comprises the following steps:
[0013] S1. Open, fix and stand the portable foldable piano tipping device, push the pin tipping elbow of the tipping plug assembly deep into the bottom of the piano, and slowly put the piano side panel support part against the back of the piano;
[0014] S2, then grab the top of the piano and make the piano tip over backwards along the direction of the portable folding piano tipping device;
[0015] S3, the piano tuner then holds the handle seat of the first piano side panel support assembly to make the portable foldable piano tipping device continue to flip over until the active sliding mechanism is downwardly contacted with the ground;
[0016] S4. After turning the piano over, the entire bottom and sides can be clearly seen, and the piano tuner begins to repair and replace parts from the front.
[0017] The above structure has the following beneficial effects:
[0018] The piano side panel support part of the present invention is a split support structure, and the two ends of the piano side panel support part are respectively sleeved on the support folding mechanism, so that the piano back and the whole piano are effectively supported by the piano side panel support part, and the supporting effect is excellent. The support frames of the support folding mechanism are locked and connected, and the support folding mechanism can play the role of supporting the piano side panel support part and the piano from the bottom of the piano side panel support part. At the same time, the support folding mechanism can be opened to support the whole by rotating and tightening the threaded locking member, or the support folding mechanism can be folded by rotating and loosening the threaded locking member. It is extremely simple and convenient to carry, and can be put down in the trunk of an ordinary car. It can be operated by one person, and the support is stable. It can effectively solve the problem that a larger turning machine cannot enter the room when turning over a piano placed in a home, and the turning machine is extremely cumbersome to carry. A tipping plug-in assembly is provided at the side end of the support folding mechanism, and the tipping plug-in assembly is plugged into the bottom of the piano. The tipping plug-in assembly includes a tipping limit clamp and a pin The tipping bent pipe and the tipping limit clamp pipe are fixedly arranged at the lower end of the three-level support bracket. The bottom end of the tipping limit clamp pipe is provided with a tipping bent pipe with a pin tilted upward. The pin tipping bent pipe is plugged into the bottom of the piano. By deepening the pin tipping bent pipe of the tipping plug assembly into the bottom of the piano, the piano side panel support part slowly sticks to the back of the piano, so that the entire bottom and side of the piano can be clearly seen after the piano is turned over. The piano tuner starts to repair and replace parts from the front, which is convenient for the piano tuner to repair the bottom of the piano, install and replace parts, and repair the paint on the side. The structural design is simple and reasonable, and there is no need to manually carry the piano or a large tipping machine to tip it over, which greatly reduces the safety hazard and is suitable for wide promotion; an active sliding mechanism is provided at one end of the support and folding mechanism, and a driven sliding mechanism is provided at the bottom side end of the support and folding mechanism. The driven sliding mechanism is relatively transmitted with the active sliding mechanism. The active sliding mechanism and the driven sliding mechanism cooperate with each other to enable the tipping device to move and shift a short distance, which is convenient for the use of the tipping device.
[0019] The supporting and folding mechanism of the present invention comprises a primary supporting bracket, a secondary supporting bracket, a tertiary supporting bracket and a fourth supporting bracket. The primary supporting bracket and the secondary supporting bracket are cross-arranged, and the central parts of the primary supporting bracket and the secondary supporting bracket are connected in a rotationally separable manner through a threaded locking piece. The tail end of the primary supporting bracket is abutted against the front end of the tertiary supporting bracket and are connected in a rotationally separable manner through a threaded locking piece. The front end of the secondary supporting bracket is abutted against the front end of the fourth supporting bracket and are connected in a rotationally separable manner through a threaded locking piece. The tail end of the fourth supporting bracket is connected in a rotationally separable manner to the central part of the tertiary supporting bracket through a threaded locking piece. Through multiple effective tests and designs, the arrangement of the above-mentioned structure enables the supporting and folding mechanism to further stabilize and support the piano side panel supporting part and the piano, and the stabilizing effect is excellent. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1The figure is a schematic structural diagram of the portable foldable piano tipping device of the present invention.
[0021] Figure 2 The diagram is a schematic structural diagram of the portable foldable piano tipping device of the present invention when it is opened.
[0022] Figure 3 Schematic diagram of the structure for inserting the tip-over plug assembly into the bottom of the piano.
[0023] Figure 4 The present invention is a schematic structural diagram of a portable foldable piano tipping device for a piano.
[0024] In the figure: 1-piano side panel support part, 101-first piano side panel support assembly, 102-second piano side panel support assembly, 103-primary longitudinal support rod, 104-secondary longitudinal support rod, 105-lateral support rod, 106-positioning clamping plate, 107-handle seat, 108-limiting clamping sleeve, 2-support folding mechanism, 201-first level support bracket, 202-second level support bracket, 203-third level support bracket, 204-fourth level support bracket, 205-thread locking piece, 206-support clamping rod, 3-flip plug-in assembly, 301-flip limit clamping tube, 302-pin flip elbow, 4-active sliding mechanism, 401-positioning support seat, 402-active pulley, 403-brake hub, 5-driven sliding mechanism, 501-connecting bracket, 502-positioning sleeve seat, 503-synchronous transmission shaft, 504-driven wheel. DETAILED DESCRIPTION
[0025] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.
[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a portable foldable piano tipping device comprises a piano side panel support part 1, a support folding mechanism 2, a tipping plug-in assembly 3, an active sliding mechanism 4 and a driven sliding mechanism 5. The piano side panel support part 1 is a split support structure, and the two ends of the piano side panel support part 1 are respectively sleeved on the support folding mechanism 2. The piano back and the whole piano are effectively supported by the piano side panel support part 1, and the supporting effect is excellent. The support frames of the support folding mechanism 2 are locked and connected. The support folding mechanism 2 can support the piano side panel support part and the piano from the bottom of the piano side panel support part 1. At the same time, the support folding mechanism 2 can be opened by rotating and tightening the threaded locking member to support the whole support, or the support folding mechanism can be rotated and loosened to open the threaded locking member. 2 is very simple and convenient to carry. It can be put down in the trunk of an ordinary car and can be operated by one person. It has a stable support and can effectively solve the problem that a large turning machine cannot enter the room when turning over a piano placed in a home, and the turning machine is extremely cumbersome to carry. An active sliding mechanism 4 is provided at one end of the support and folding mechanism 2, and a driven sliding mechanism 5 is provided at the bottom side of the support and folding mechanism 2. The driven sliding mechanism 5 is relatively transmitted with the active sliding mechanism 4. The active sliding mechanism 4 and the driven sliding mechanism 5 cooperate with each other to enable the tipping device to move and shift a short distance, which is convenient for the use of the tipping device. A tipping plug-in assembly 3 is provided at the side end of the support and folding mechanism 2, and the tipping plug-in assembly 3 is plugged into the bottom of the piano.
[0027] The piano side panel support part 1 includes a first piano side panel support assembly 101 and a second piano side panel support assembly 102. The first piano side panel support assembly 101 and the second piano side panel support assembly 102 both include a primary longitudinal support rod 103 and a secondary longitudinal support rod 104. A transverse support rod 105 is fixedly arranged between the primary longitudinal support rod 103 and the secondary longitudinal support rod 104.
[0028] The bottom of the primary longitudinal support rod 103 and the secondary longitudinal support rod 104 are fixedly provided with a limit clamping sleeve 108. The first piano side panel support assembly 101 also includes a positioning clamping plate 106 and a handle seat 107. The bottom of the primary longitudinal support rod 103 and the secondary longitudinal support rod 104 are fixedly provided with a positioning clamping plate 106, and a handle seat 107 is provided between the positioning clamping plates 106.
[0029] The supporting and folding mechanism 2 comprises a primary supporting bracket 201, a secondary supporting bracket 202, a tertiary supporting bracket 203 and a quaternary supporting bracket 204, wherein the primary supporting bracket 201 and the secondary supporting bracket 202 are cross-arranged, the central parts of the primary supporting bracket 201 and the secondary supporting bracket 202 are connected in a rotationally separated manner through a threaded locking member 205, the tail end of the primary supporting bracket 201 is attached to the front end of the tertiary supporting bracket 203 and is connected in a rotationally separated manner through the threaded locking member 205, the front end of the secondary supporting bracket 202 is attached to the front end of the quaternary supporting bracket 204 and is connected in a rotationally separated manner through the threaded locking member 205, and the tail end of the quaternary supporting bracket 204 is connected in a rotationally separated manner with the central part of the tertiary supporting bracket 203 through the threaded locking member 205;
[0030] A support clamping rod 206 is provided at the side end of the fourth-level support bracket 204 . The support clamping rod 206 is provided at the lower end of the primary longitudinal support rod 103 and the secondary longitudinal support rod 104 and is sleeved on the limiting clamping sleeve 108 .
[0031] The tipping plug assembly 3 includes a tipping limit clamp 301 and a pin tipping bent pipe 302. The tipping limit clamp 301 is fixedly arranged at the lower end of the three-level support bracket 203. The bottom end of the tipping limit clamp 301 is provided with a pin tipping bent pipe 302 inclined upward. The pin tipping bent pipe 302 is plugged into the bottom of the piano. By inserting the pin tipping bent pipe 302 of the tipping plug assembly 3 deep into the bottom of the piano, the piano side panel support part 1 slowly sticks to the back of the piano, so that the entire bottom and side of the piano can be clearly seen after the piano is turned over. The piano tuner starts to repair and replace parts from the front, which is convenient for the piano tuner to repair the bottom of the piano, install and replace parts, and repair the paint on the side. The structural design is simple and reasonable, and there is no need to manually carry the piano or a large flip machine to flip it, which greatly reduces safety hazards and is suitable for wide promotion.
[0032] The active sliding mechanism 4 includes a positioning support seat 401, an active pulley 402 and a brake hub 403. The positioning support seat 401 is fixedly arranged at the lower end of the secondary support bracket 202. The active pulley 402 is installed under the positioning support seat 401, and the brake hub 403 is installed on the active pulley.
[0033] The driven sliding mechanism 5 includes a connecting bracket 501, a positioning sleeve 502, a synchronous transmission shaft 503 and a driven wheel 504. The connecting bracket 501 is fixedly arranged between the three-level supporting brackets 203. The positioning sleeve 502 is fixed to the lower end of the connecting bracket 501. The synchronous transmission shaft 503 is sleeved on the positioning sleeve 502 and extends to both ends to be connected with the driven wheel 504.
[0034] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.
[0035] The specific working process is: first, the operator stands up the folded tipping device and rotates and tightens the threaded locking piece 205 of the support folding mechanism 2 to fix the first-level support bracket 201, the second-level support bracket 202, the third-level support bracket 203 and the fourth-level support bracket 204, then the pin tipping elbow 302 of the tipping plug-in assembly 3 is inserted into the bottom of the piano, the piano side panel support part 1 slowly sticks to the back of the piano, and then the top of the piano is grasped to make the piano tip backward along the direction of the portable foldable piano tipping device. Then the piano tuner holds the handle seat 107 of the first piano side panel support assembly 101 to make the portable foldable piano tipping device continue to flip until the active sliding mechanism 4 is downwardly contacted with the ground. After flipping, the entire bottom and side of the piano can be clearly seen. The piano tuner starts to repair and replace parts from the front, and the active sliding mechanism 4 pushes the tipping device to move to the specified position to complete the replacement.
[0036] The active sliding mechanism 4 uses universal wheels to facilitate short-distance movement and displacement, and the driven sliding mechanism 5 uses rubber wheels without steering to facilitate fixing the direction and ensure the stability of the piano inversion process.
[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0038] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0039] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features of the invention described herein.
Claims
1. A portable foldable piano tipping device, characterized in that: The piano side panel support part (1) comprises a piano side panel support part (1), a support folding mechanism (2), a tipping plug-in assembly (3), an active sliding mechanism (4) and a driven sliding mechanism (5), wherein the piano side panel support part (1) is a split support structure, the two ends of the piano side panel support part (1) are respectively sleeved on the support folding mechanism (2), the support frames of the support folding mechanism (2) are locked and connected, an active sliding mechanism (4) is provided at one end of the support folding mechanism (2), a driven sliding mechanism (5) is provided at the bottom side end of the support folding mechanism (2), the driven sliding mechanism (5) is relatively driven with the active sliding mechanism (4), a tipping plug-in assembly (3) is provided at the side end of the support folding mechanism (2), and the tipping plug-in assembly (3) is plugged into the bottom of the piano; The piano side panel support part (1) comprises a first piano side panel support assembly (101) and a second piano side panel support assembly (102), wherein the first piano side panel support assembly (101) and the second piano side panel support assembly (102) both comprise a primary longitudinal support rod (103) and a secondary longitudinal support rod (104); Positioning clamping plates (106) are fixedly provided at the bottom of the primary longitudinal support rod (103) and the secondary longitudinal support rod (104), and a handle seat (107) is provided between the positioning clamping plates (106); The support and folding mechanism (2) comprises a primary support bracket (201), a secondary support bracket (202), a tertiary support bracket (203) and a quaternary support bracket (204); the primary support bracket (201) and the secondary support bracket (202) are arranged crosswise; the primary support bracket (201) and the central part of the secondary support bracket (202) are connected in a rotationally separable manner via a threaded locking member (205); the tail end of the primary support bracket (201) is attached to the front end of the tertiary support bracket (203) and is connected in a rotationally separable manner via a threaded locking member (205); the front end of the secondary support bracket (202) is attached to the front end of the quaternary support bracket (204) and is connected in a rotationally separable manner via a threaded locking member (205); the tail end of the quaternary support bracket (204) is connected in a rotationally separable manner to the central part of the tertiary support bracket (203) via a threaded locking member (205); The tip-over plug assembly (3) comprises a tip-over limit clamping tube (301) and a pin tip-over bent tube (302); the tip-over limit clamping tube (301) is fixedly arranged at the lower end of the three-level support bracket (203); a pin tip-over bent tube (302) inclined upward is arranged at the bottom end of the tip-over limit clamping tube (301); the pin tip-over bent tube (302) is plugged into the bottom of the piano.
2. The portable foldable piano tipping device according to claim 1, characterized in that: A support clamping rod (206) is provided at the side end of the four-stage support bracket (204); the support clamping rod (206) is provided at the lower ends of the primary longitudinal support rod (103) and the secondary longitudinal support rod (104) and is sleeved on the limit clamping sleeve (108).
3. The portable foldable piano tipping device according to claim 1, characterized in that: The active sliding mechanism (4) comprises a positioning support seat (401), an active pulley (402) and a brake hub (403); the positioning support seat (401) is fixedly arranged at the lower end of the secondary support bracket (202); the active pulley (402) is arranged below the positioning support seat (401); and the brake hub (403) is arranged on the active pulley.
4. The portable foldable piano tipping device according to claim 1, characterized in that: The driven sliding mechanism (5) comprises a connecting bracket (501), a positioning sleeve (502), a synchronous transmission shaft (503) and a driven wheel (504); the connecting bracket (501) is fixedly arranged between the three-level supporting brackets (203); a positioning sleeve (502) is fixed at the lower end of the connecting bracket (501); the synchronous transmission shaft (503) is sleeved on the positioning sleeve (502) and extends to both ends to be connected to the driven wheel (504).
5. The tipping method of the portable foldable piano tipping device according to claim 1, characterized in that: The steps include: S1, the portable foldable piano tipping device is opened, fixed and stood up, the pin tipping elbow (302) of the tipping plug assembly (3) is inserted deep into the bottom of the piano, and the piano side panel support part (1) is slowly attached to the back of the piano; S2, then grab the top of the piano and make the piano tip over backwards along the direction of the portable folding piano tipping device; S3, the piano tuner then holds the handle seat (107) of the first piano side panel support assembly (101) to cause the portable foldable piano tipping device to continue to tip over until the active sliding mechanism (4) is moved downward to contact the ground; S4. After turning the piano over, the entire bottom and sides can be clearly seen, and the piano tuner begins to repair and replace parts from the front.
Citation Information
Patent Citations
Portable folding piano turnover device
CN217562241U