CN113838439B - Piano key cover linkage system - Google Patents
Piano key cover linkage system Download PDFInfo
- Publication number
- CN113838439B CN113838439B CN202111089137.5A CN202111089137A CN113838439B CN 113838439 B CN113838439 B CN 113838439B CN 202111089137 A CN202111089137 A CN 202111089137A CN 113838439 B CN113838439 B CN 113838439B
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- piano
- rod
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- plate
- connecting rod
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- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 230000005484 gravity Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
- G10C3/16—Actions
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
The invention discloses a piano keycap linkage system, which comprises a first driving device connected with a keyboard cover plate (1) of a piano and a second driving device connected with a piano middle plate (2); the piano medium plate (2) is in an open state, the keyboard cover plate (1) firstly ascends by one end to be away from and then pushes inwards, the first driving device and the second driving block (4) are pushed simultaneously, the first driving device positions the position of the keyboard cover plate (1) after being pushed inwards, the second driving block (4) is pushed by one end to be away from and pushes the first driving block (3) to move outwards through the rotating mechanism, and meanwhile the first driving block (3) pushes the piano medium plate (2) to swing outwards. The piano keycap linkage system pushes away the middle plate and positions the middle plate through a plurality of driving mechanisms when the keys are pushed away, and the middle plate is opened and closed conveniently and quickly without additional operation.
Description
Technical Field
The invention relates to the technical field of piano parts, in particular to a piano keycap linkage system.
Background
There is a type of piano at present, is equipped with a medium plate on the last door plant of key top, and the top of medium plate is regarded as wobbling center pin, and the bottom can push away in the key direction to make the sound of playing better from the inside transmission of piano. When the middle plate is opened, the piano in the prior art is opened manually, and a positioning rod is required to be arranged, and the pushed middle plate is supported by the positioning rod; meanwhile, when the door is closed, the positioning rod and the middle plate are required to be retracted simultaneously, so that inconvenience is brought to normal opening and closing.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the piano keycap linkage system which pushes the middle plate and positions the middle plate through a plurality of driving mechanisms while pushing the keys, does not need additional operation and enables the middle plate to be opened and closed conveniently and rapidly.
The technical scheme of the invention is that the piano keycap linkage system with the following structure is provided, and the piano keycap linkage system comprises a first driving device connected with a keyboard cover plate of a piano and a second driving device connected with a middle plate of the piano; the second driving device comprises a first driving block, a second driving block and a rotating mechanism, and the first driving block is connected to the bottom of the rotating mechanism; the rotating mechanism is positioned on the back of the piano middle plate, and the first driving block is connected to the top of the second driving mechanism;
in a closed state of the piano middle plate, the keyboard cover plate covers the keys, the first driving block abuts against the inner side face of the piano middle plate, and the outer wall of the second driving block contacts with the inner side face of the keyboard cover plate;
in the open state of the piano middle plate, the keyboard cover plate firstly ascends one end to a distance and then pushes inwards, meanwhile, the first driving device and the second driving block are pushed, the first driving device positions the position of the keyboard cover plate after being pushed inwards, the second driving block is pushed by one end to a distance and pushes the first driving block to move outwards through the rotating mechanism, and meanwhile, the first driving block pushes the piano middle plate to swing outwards;
in the state that the piano medium plate resets, the keyboard apron is earlier to outside removal one end distance and then downwards, makes keyboard apron inboard and second drive piece separation one end distance, the piano medium plate swings under self gravity effect and resets and promote first drive piece, simultaneously first drive piece promotes the second drive piece again through slewing mechanism.
The first driving device comprises a swinging rod, two positioning rods and two fixing rods; the swinging rod is rotatably connected to the bottom of the middle disc of the piano, two ends of the swinging rod are bent upwards to form side rods, the side rods are in a lever structure, and the body of the swinging rod is a rotation center serving as a fulcrum; the side rods extend out of the top surface of the piano center plate; the fixed end of each positioning rod is arranged on the side wall of the side rod extending out of the top surface of the middle piano plate and is in a vertical state, the free end of each positioning rod is propped against or separated from the piano side plate, in a piano middle plate closing state, the free end of each positioning rod is propped against and positioned against the piano side plate, and in a piano middle plate opening state, the positioning rods are separated from the piano side plate; the top of each fixed rod is fixed with the bottom surface of the inner side of the keyboard cover plate, and the bottom is rotationally connected with the top of the side rod at the corresponding end.
The rotating mechanism comprises a bracket, a rotating rod, a first connecting rod and a second connecting rod, and the bracket is fixed at the bottom of a door panel base of the piano; the rotating rods are vertically distributed and rotationally connected to the support, the top surface of the top extending out of the support is fixed with one end of the first connecting rod, the bottom surface of the bottom extending out of the support is fixed with one end of the second connecting rod, the other end of the first connecting rod is a free end and is provided with a first connecting shaft, and the first driving block is sleeved on the first connecting shaft and axially limited; the other end of the second connecting rod is a free end and is provided with a second connecting shaft, the second driving block is sleeved on the second connecting shaft and axially limited, and the first connecting rod and the second connecting rod synchronously rotate in a circular mode by using a rotating rod and are projected on a horizontal plane to form an included angle alpha.
The piano apron promotes first connecting rod pivoted angle and second connecting rod's rotation angle unanimous, and both rotation direction is unanimous.
The side walls on two sides of the middle disc of the piano are provided with notches, the side bars are embedded in the notches and swing in the notches, and the outermost sides of the side bars are lower than the surfaces of the side walls after being installed.
A space is arranged in front of the bracket and the piano middle plate, the second connecting rods are obliquely distributed in the space along the horizontal direction, and the second connecting rods are detachably connected and fixed with the top of the rotating rod; the rotating rod rotates to synchronously drive the second connecting rod, and the second connecting rod rotates along the same direction by taking the axis of the rotating rod as the circle center.
After adopting the structure, the invention has the following advantages: in a closed state of the piano middle plate, the keyboard cover plate covers the keys, the first driving block abuts against the inner side face of the piano middle plate, and the outer wall of the second driving block contacts with the inner side face of the keyboard cover plate; in the open state of the piano middle plate, the keyboard cover plate firstly ascends one end to a distance and then pushes inwards, meanwhile, the first driving device and the second driving block are pushed, the first driving device positions the position of the keyboard cover plate after being pushed inwards, the second driving block is pushed by one end to a distance and pushes the first driving block to move outwards through the rotating mechanism, and meanwhile, the first driving block pushes the piano middle plate to swing outwards; in the state that the piano medium plate resets, the keyboard apron is earlier to outside removal one end distance and then downwards, makes keyboard apron inboard and second drive piece separation one end distance, the piano medium plate swings under self gravity effect and resets and promote first drive piece, simultaneously first drive piece promotes the second drive piece again through slewing mechanism. Through the switching of the above three different states, the middle plate is pushed away and positioned through the first driving mechanism and the second driving mechanism at the same time of pushing away the key, and the middle plate is opened and closed conveniently and quickly without additional operation of hands of people.
As an improvement, the first driving device comprises a swinging rod, two positioning rods and two fixing rods; the swinging rod is rotatably connected to the bottom of the middle disc of the piano, two ends of the swinging rod are bent upwards to form side rods, the side rods are in a lever structure, and the body of the swinging rod is a rotation center serving as a fulcrum; the side rods extend out of the top surface of the piano center plate; the fixed end of each positioning rod is arranged on the side wall of the side rod extending out of the top surface of the middle piano plate and is in a vertical state, the free end of each positioning rod is propped against or separated from the piano side plate, in a piano middle plate closing state, the free end of each positioning rod is propped against and positioned against the piano side plate, and in a piano middle plate opening state, the positioning rods are separated from the piano side plate; the top of every dead lever is fixed with the inboard bottom surface of keyboard apron, and the bottom then rotates with the top of the side lever of corresponding one end to be connected, and this structure not only can play the piano center plate and promote the second drive piece, but also can fix a position the location behind the keyboard apron inwards pushing in place, avoids the unexpected reset of keyboard apron.
As an improvement, the rotating mechanism comprises a bracket, a rotating rod, a first connecting rod and a second connecting rod, wherein the bracket is fixed at the bottom of a door panel base of the piano; the rotating rods are vertically distributed and rotationally connected to the support, the top surface of the top extending out of the support is fixed with one end of the first connecting rod, the bottom surface of the bottom extending out of the support is fixed with one end of the second connecting rod, the other end of the first connecting rod is a free end and is provided with a first connecting shaft, and the first driving block is sleeved on the first connecting shaft and axially limited; the other end of the second connecting rod is a free end and is provided with a second connecting shaft, the second driving block is sleeved on the second connecting shaft and axially limited, the first connecting rod and the second connecting rod synchronously rotate in a circular mode by using a rotating rod and are projected on a horizontal plane to form an included angle alpha, and the structure achieves connection of synchronous rotation of the first driving block and the second driving block.
Drawings
Fig. 1 is a schematic diagram of a piano keycap linkage system of the present invention.
Fig. 2 is a schematic view of a piano keycap linkage system of the piano of the present invention in a closed state of the piano plate.
Fig. 3 is a schematic view of the piano keycap linkage system of the first step of opening the piano of the present invention.
Fig. 4 is a schematic view of the linkage system of the piano keycap of the second step of opening the middle plate of the piano of the present invention.
Fig. 5 is a schematic view of the piano of the present invention closed.
Fig. 6 is a schematic diagram of the first step of opening the piano plate of the present invention.
Fig. 7 is a schematic diagram of the second step of opening the middle plate of the piano of the present invention.
The figure shows:
1. keyboard apron, 2, piano medium plate, 3, first drive piece, 4, second drive piece, 5, swinging arms, 6, locating lever, 7, dead lever, 8, piano middle plate, 9, side lever, 10, piano curb plate, 11, support, 12, dwang, 13, first connecting rod, 14, second connecting rod, 15, door plant base, 16, first connecting axle, 17, second connecting axle, 18, groove shelves.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the linkage system of the piano keycap of the present invention comprises a first driving device connected with a keyboard cover plate 1 of a piano, and a second driving device connected with a middle plate 2 of the piano; the second driving device comprises a first driving block 3, a second driving block 4 and a rotating mechanism, wherein the first driving block 3 is connected to the bottom of the rotating mechanism; the rotating mechanism is positioned on the back of the piano middle plate 2, and the first driving block 3 is connected to the top of the second driving mechanism.
The first driving device comprises a swinging rod 5, two positioning rods 6 and two fixing rods 7; the swinging rod 5 is rotatably connected to the bottom of the middle disc 8 of the piano, two ends of the swinging rod 5 are bent upwards to form side rods 9, the side rods 9 are of lever structures, and the body of the swinging rod 5 is a rotation center serving as a fulcrum; the side bars 9 extend out of the top surface of the piano center plate 8; the fixed end of each positioning rod 6 is arranged on the side wall of the side rod 9 extending out of the top surface of the middle piano disk 8 and is in a vertical state, the free end of each positioning rod 6 is propped against or separated from the piano side plate 10, in the closed state of the piano middle plate 2, the free end of each positioning rod 6 is propped against and positioned against the piano side plate 10, and in the open state of the piano middle plate 2, the positioning rods 6 are separated from the piano side plate 10; the top of each fixed rod 7 is fixed with the inner bottom surface of the keyboard cover plate 1, and the bottom is rotationally connected with the top of the side rod 9 at the corresponding end.
The rotating mechanism comprises a bracket 11, a rotating rod 12, a first connecting rod 13 and a second connecting rod 14, wherein the bracket 11 is fixed at the bottom of a door panel base 15 of the piano; the rotating rods 12 are vertically distributed and rotationally connected to the bracket 11, the top surface of the top extending out of the bracket 11 is fixed with one end of the first connecting rod 13, the bottom surface of the bottom extending out of the bracket 11 is fixed with one end of the second connecting rod 14, the other end of the first connecting rod 13 is a free end and is provided with a first connecting shaft 16, and the first driving block 3 is sleeved on the first connecting shaft 16 and axially limited; the other end of the second connecting rod 14 is a free end and is provided with a second connecting shaft 17, the second driving block 4 is sleeved on the second connecting shaft 17 and axially limited, and the first connecting rod 13 and the second connecting rod 14 synchronously rotate in a circular shape with the rotating rod 12 and are projected on the horizontal plane and are provided with an included angle alpha.
The piano cover plate 2 pushes the first connecting rod 13 to rotate at an angle consistent with the second connecting rod 14 in rotation direction.
The side walls on two sides of the middle piano disk 8 are provided with notches, the side rods 9 are embedded into the notches and swing in the notches, and the outermost sides of the side rods 9 are lower than the surfaces of the side walls after being installed.
A space is arranged in front of the bracket 11 and the piano middle plate 2, the second connecting rods 14 are obliquely distributed in the space along the horizontal direction, and the second connecting rods 14 are detachably connected and fixed with the top of the rotating rod 12; the rotation of the rotating rod 12 synchronously drives the second connecting rod 14, and the rotating rod rotates in the same direction by taking the axis of the rotating rod 12 as the circle center.
As shown in fig. 2 and 5, in the closed state of the piano middle plate 2, the keyboard cover plate 1 covers the keys, the outer side of the keyboard cover plate 1 is provided with a groove stop 18, the first driving block 3 is propped against the inner side surface of the piano middle plate 2, and the outer wall of the second driving block 4 is contacted with the inner side surface of the keyboard cover plate 1; the angle of both the first link 13 connecting the first drive block 3 and the second link 14 connecting the second drive block 4 is now an angle α which is fixed after being adjusted in place.
As shown in fig. 3 to 7, in the open state of the piano middle plate 2, it is opened in two steps: as shown in fig. 3 and 6, the keyboard cover 1 is lifted a distance in the first step. As shown in fig. 4 and 7, the second step is pushed inward again, pushing the first driving means and the second driving block 4 at the same time. The first driving device positions the position of the keyboard cover plate 1 after being pushed inwards, specifically: the keyboard cover plate 1 pushes the two fixing rods 7 inwards, at this time, the swinging rod 5 rotates, the side rods 9 on two sides rotate by taking the body as a rotation center shaft, meanwhile, the two positioning rods 6 are separated from the side plates 10 of the piano, and the side plates 9 swing and are used for positioning the position of the keyboard cover plate 1 pushed inwards.
The second driving block 4 is pushed by one end distance and pushes the first driving block 3 to move outwards through the rotating mechanism, specifically, the second driving block 4 is pushed by one end distance, the second driving block 4 pushes the rotating rod 12 to rotate at the bracket 11 by a certain angle through the second connecting rod 14, the rotating rod 12 synchronously drives the first connecting rod 13 to rotate by the same angle, and the first connecting rod 13 rotates to drive the first driving block 3 to push the piano middle plate 2 to swing outwards, so that the piano middle plate 2 is opened.
In the state that the middle plate 2 of the piano resets, the keyboard cover plate 1 firstly moves one end to the outside for a distance and then downwards, the keyboard cover plate 1 is pulled outwards, and simultaneously drives the two fixing rods 7 to move together, so that the side plate 9 swings reversely until the two positioning rods 6 are propped against the side plate 10 of the piano, at the moment, the keyboard cover plate 1 is positioned and stopped, and at the moment, the inner side of the keyboard cover plate 1 is separated from the second driving block 4 for one end for a distance. At this time, the middle plate 2 of the piano swings and resets under the action of self gravity to push the first driving block 3, and meanwhile, the first driving block 3 pushes the second driving block 4 again through the rotating mechanism, and the second driving block 4 has enough positions to move and reset to the initial state.
Claims (2)
1. A piano keycap linkage system, characterized by: comprises a first driving device connected with a keyboard cover plate (1) of the piano and a second driving device connected with a middle plate (2) of the piano; the second driving device comprises a first driving block (3), a second driving block (4) and a rotating mechanism, wherein the first driving block (3) is connected to the bottom of the rotating mechanism; the rotating mechanism is positioned on the back of the piano middle plate (2), and the first driving block (3) is connected to the top of the second driving mechanism;
in a closed state of the piano middle plate (2), the keyboard cover plate (1) covers the keys, the first driving block (3) is propped against the inner side surface of the piano middle plate (2), and the outer wall of the second driving block (4) is contacted with the inner side surface of the keyboard cover plate (1);
in the open state of the piano middle plate (2), the keyboard cover plate (1) firstly ascends for a certain distance and then pushes inwards, meanwhile, the first driving device and the second driving block (4) are pushed, the first driving device positions the position of the keyboard cover plate (1) after being pushed inwards, the second driving block (4) is pushed for a certain distance and pushes the first driving block (3) to move outwards through the rotating mechanism, and meanwhile, the first driving block (3) pushes the piano middle plate (2) to swing outwards;
in a reset state of the piano middle plate (2), the keyboard cover plate (1) firstly moves to the outer side for a certain distance and then moves downwards, so that the inner side of the keyboard cover plate (1) is separated from the second driving block (4) for a certain distance, the piano middle plate (2) swings under the action of self gravity to reset and push the first driving block (3), and meanwhile, the first driving block (3) pushes the second driving block (4) again through a rotating mechanism; the second driving block (4) has enough positions to move and reset to the initial state;
the first driving device comprises a swinging rod (5), two positioning rods (6) and two fixing rods (7); the swinging rod (5) is rotatably connected to the bottom of the middle disc (8) of the piano, two ends of the swinging rod (5) are bent upwards to form side rods (9), the side rods (9) are of lever structures, and the body of the swinging rod (5) is a rotation center serving as a fulcrum; the side rods (9) extend out of the top surface of the piano middle disc (8); the fixed end of each positioning rod (6) is arranged on the side wall of the side rod (9) extending out of the top surface of the middle piano plate (8) and is in a vertical state, the free end of each positioning rod (6) is propped against or separated from the piano side plate (10), in the closed state of the piano middle plate (2), the free end of each positioning rod (6) is propped against the piano side plate (10) to be positioned, and in the open state of the piano middle plate (2), the positioning rods (6) are separated from the piano side plate (10); the top of each fixed rod (7) is fixed with the bottom surface of the inner side of the keyboard cover plate (1), and the bottom is rotationally connected with the top of a side rod (9) at the corresponding end;
the rotating mechanism comprises a bracket (11), a rotating rod (12), a first connecting rod (13) and a second connecting rod (14), wherein the bracket (11) is fixed at the bottom of a door panel base (15) of the piano; the rotating rods (12) are vertically distributed and rotationally connected to the support (11), the top surface of the top extending out of the support (11) is fixed with one end of the first connecting rod (13), the bottom surface of the bottom extending out of the support (11) is fixed with one end of the second connecting rod (14), the other end of the first connecting rod (13) is a free end and is provided with a first connecting shaft (16), and the first driving block (3) is sleeved on the first connecting shaft (16) and axially limited; the other end of the second connecting rod (14) is a free end and is provided with a second connecting shaft (17), the second driving block (4) is sleeved on the second connecting shaft (17) and axially limited, and the first connecting rod (13) and the second connecting rod (14) synchronously rotate by taking the rotating rod (12) as a circle center and are projected on a horizontal plane to form an included angle alpha;
the piano middle plate (2) pushes the rotation angle of the first connecting rod (13) to be consistent with the rotation angle of the second connecting rod (14), and the rotation directions of the first connecting rod and the second connecting rod are consistent;
the two side walls of the middle piano plate (8) are provided with notches, the side rods (9) are embedded into the notches and swing in the notches, and the outermost side of each side rod (9) is lower than the surface of the side wall after being installed.
2. The piano keycap linkage system according to claim 1, wherein: a space is arranged in front of the bracket (11) and the piano middle plate (2), the second connecting rods (14) are obliquely distributed in the space along the horizontal direction, and the second connecting rods (14) are detachably connected and fixed with the tops of the rotating rods (12); the rotating rod (12) rotates to synchronously drive the second connecting rod (14) and rotates in the same direction by taking the axis of the rotating rod (12) as the center of a circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111089137.5A CN113838439B (en) | 2021-09-16 | 2021-09-16 | Piano key cover linkage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111089137.5A CN113838439B (en) | 2021-09-16 | 2021-09-16 | Piano key cover linkage system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113838439A CN113838439A (en) | 2021-12-24 |
| CN113838439B true CN113838439B (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111089137.5A Active CN113838439B (en) | 2021-09-16 | 2021-09-16 | Piano key cover linkage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113838439B (en) |
Citations (10)
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|---|---|---|---|---|
| US4387623A (en) * | 1981-09-11 | 1983-06-14 | Baldwin Piano & Organ Company | Parallel motion linkage for the sliding keyboard cover of a piano |
| KR19990009570U (en) * | 1997-08-22 | 1999-03-15 | 전주범 | Piano Key Cover |
| KR20050020342A (en) * | 2003-08-22 | 2005-03-04 | 주식회사 알렌무역상사 | Slow closing device of keyboard cover of console-type piano |
| JP2007188018A (en) * | 2006-01-16 | 2007-07-26 | Yamaha Corp | Keyboard instrument |
| WO2012152946A1 (en) * | 2011-05-12 | 2012-11-15 | Vioga Gmbh | Pianoforte instrument, in particular a piano, with a housing on bearing points |
| CN203982757U (en) * | 2014-05-16 | 2014-12-03 | 刘宝璋 | A kind of piano |
| CN107123414A (en) * | 2017-06-30 | 2017-09-01 | 杨以桡 | Fingerboard overlooks mirror and method is played in the guiding of fingerboard mirror image |
| CN208673706U (en) * | 2018-08-21 | 2019-03-29 | 姚岚 | A kind of novel vertical piano with concealed music stand |
| CN211150073U (en) * | 2019-09-18 | 2020-07-31 | 广州珠江恺撒堡钢琴有限公司 | Piano keyboard cover slow descending mechanism and piano |
| CN211578331U (en) * | 2019-09-02 | 2020-09-25 | 主若萱 | Noiseless hidden piano keyboard lid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7332669B2 (en) * | 2002-08-07 | 2008-02-19 | Shadd Warren M | Acoustic piano with MIDI sensor and selective muting of groups of keys |
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2021
- 2021-09-16 CN CN202111089137.5A patent/CN113838439B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4387623A (en) * | 1981-09-11 | 1983-06-14 | Baldwin Piano & Organ Company | Parallel motion linkage for the sliding keyboard cover of a piano |
| KR19990009570U (en) * | 1997-08-22 | 1999-03-15 | 전주범 | Piano Key Cover |
| KR20050020342A (en) * | 2003-08-22 | 2005-03-04 | 주식회사 알렌무역상사 | Slow closing device of keyboard cover of console-type piano |
| JP2007188018A (en) * | 2006-01-16 | 2007-07-26 | Yamaha Corp | Keyboard instrument |
| WO2012152946A1 (en) * | 2011-05-12 | 2012-11-15 | Vioga Gmbh | Pianoforte instrument, in particular a piano, with a housing on bearing points |
| CN203982757U (en) * | 2014-05-16 | 2014-12-03 | 刘宝璋 | A kind of piano |
| CN107123414A (en) * | 2017-06-30 | 2017-09-01 | 杨以桡 | Fingerboard overlooks mirror and method is played in the guiding of fingerboard mirror image |
| CN208673706U (en) * | 2018-08-21 | 2019-03-29 | 姚岚 | A kind of novel vertical piano with concealed music stand |
| CN211578331U (en) * | 2019-09-02 | 2020-09-25 | 主若萱 | Noiseless hidden piano keyboard lid |
| CN211150073U (en) * | 2019-09-18 | 2020-07-31 | 广州珠江恺撒堡钢琴有限公司 | Piano keyboard cover slow descending mechanism and piano |
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| Publication number | Publication date |
|---|---|
| CN113838439A (en) | 2021-12-24 |
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