TWM592150U - Double-layer thumb piano with semitone key - Google Patents

Abstract

This composition is a double-layer thumb piano with semitone keys, which includes a body, a plurality of first keys, a plurality of second keys, and a pillow assembly arranged along the longitudinal direction of the body, a front abutment frame, a The middle abutment frame and a rear abutment frame; the front abutment frame has a first depression hole; the middle abutment frame has a first support hole and a second depression hole located above the first support hole; the first The key is located above the pillow assembly and penetrates the first down hole and the first support hole in sequence; the first key is pressed down by the first down hole and is supported and fixed upward by the pillow assembly and the first support hole; The position of the second key is higher than that of the first key; the second key penetrates through the second depression hole and is supported and fixed upward by the front abutment frame and the rear abutment frame; by this, the creation further sets the semitone keys, and the sound range is complete.

Description

Double-layer thumb piano with semitone keys

This creative department relates to a plucked musical instrument, especially a thumb piano (or kalimba) with double-layer keys and semitone keys.

The thumb piano is an African characteristic musical instrument. It includes a piano body and a plurality of elastic metal strips of different lengths. The ends of the keys are fixed to the piano body and are arranged in a row. When playing the thumb piano, hold the sides of the body with both hands, and then use the thumb to pluck the tail end of the key to make the key vibrate and sound.

However, the lateral length of the body of the thumb piano needs to be designed in accordance with the lateral movement range of the thumb, but because the lateral movement range of the thumb is very limited, the lateral length of the thumb piano body is also very limited, thereby limiting the number of keys that can be installed on the thumb piano . Due to the limited number of keys, the thumb keys in the prior art are usually 5th, 7th, 10th, and 17th, and are all composed of main sounds. There are no semitone keys, resulting in an incomplete sound range and the inability to play semitones. Sheet music.

Therefore, the prior art thumb piano needs to be improved.

In view of the aforementioned shortcomings and deficiencies of the prior art, the present invention provides a double-layer thumb piano with semitone keys, which is further provided with another row of keys above the keys arranged in a row in the prior art in order to simultaneously in a limited space Set the full key and semitone key.

In order to achieve the above-mentioned creative purpose, the technical method used in this creation is to design a double-layer thumb piano with semitone keys, which includes: A piano body having a longitudinal direction and a lateral direction, a piano pillow assembly, a front abutment frame, a middle abutment frame and a rear abutment frame are sequentially arranged along the longitudinal direction on the piano body, and the piano pillow assembly, The front abutment frame, the middle abutment frame and the rear abutment frame all extend along the lateral direction; The front abutment frame has a first depression hole, which extends in the lateral direction; The middle abutment frame has a first supporting hole and a second downward pressing hole, the first supporting hole and the second downward pressing hole both extend along the lateral direction, and the height position of the second downward pressing hole is higher than the The height position of the first support hole; A plurality of first keys, which are elongated and located above the body and the pillow assembly; each of the first keys abuts the pillow assembly downwards, and penetrates the front abutment frame along the longitudinal direction A first pressing hole and the first supporting hole of the middle abutting frame; the top side wall surface of the first pressing hole presses down the first keys, the bottom side wall surface of the first supporting hole and the piano pillow assembly The top of the abuts the first key; A plurality of second keys, which are elongated and located above the front abutment frame; each second key abuts the front abutment frame downward and penetrates the second of the middle abutment frame in the longitudinal direction Press down the hole and extend in the longitudinal direction above the rear abutment frame; the top wall surface of the second down hole presses down the second keys, the top of the rear abutment frame abuts the second Piano keys Wherein, the height positions of the second keys are higher than the height positions of the first keys.

The advantage of this creation is that the middle support frame has a second lower pressure hole above the first support hole for mounting the first key, and the side of the middle support frame opposite to the front support frame is provided with a rear support frame, and , A second key is further provided above the first key (that is, this creation has a double-layer key), the second key is pressed through the second pressing hole, and the front abutment frame and the rear abutment frame are upwardly abutted. The clamp is fixed above the first key.

By further arranging the second key above the first key, this creation can set more keys on the body without increasing the lateral length of the body, and therefore can set both full-tone and semi-tone keys at the same time. Make the full-tone keys and semitone keys in the limited space at the same time, so that this creation has a full range of sound ranges, and you can play the semitone notes. Specifically, the second key located on the upper layer may be a semitone key, and a special fill key may be further added to complete the octave range, and the fill sound adds an accent effect.

Further, the double-layer thumb piano with semitone keys, wherein the double-layer thumb piano with semitone keys further includes a connecting plate screwed and fixed to the body, the bottom of the front abutment frame and the The bottom of the middle abutment frame is respectively connected to the opposite sides of the connecting plate, and the front abutment frame, the connecting plate and the middle abutment frame are integrally formed; the rear abutment frame is screwed and fixed to the body .

Further, in the double-layer thumb piano with semitone keys, wherein the top side wall surface of the first depression hole of the front abutment frame protrudes at least one first protrusion, the at least one first protrusion It has an arc surface; the top of the arc surface of the at least one first protrusion presses down one of the first keys.

Further, in the double-layer thumb piano with semitone keys, wherein the top side wall surface of the second depression hole of the middle abutment frame protrudes at least one second protrusion, the at least one second protrusion It has an arc surface; the top of the arc surface of the at least one second protrusion presses down one of the second keys.

Further, in the double-layer thumb piano with semitone keys, wherein at least one second depression reinforcement part is formed in the second depression hole of the middle abutment frame, the at least one second depression reinforcement part It is located between two adjacent second keys, and the opposite ends of the at least one second depression reinforcement portion are respectively connected to the top side wall surface of the second depression hole and the bottom side of the second depression hole Wall surface.

Further, in the double-layer thumb piano with semitone keys, at least one first support reinforcement portion is formed in the first support hole of the middle support frame, the at least one first support reinforcement portion is located adjacent to Between two of the second keys, and opposite ends of the at least one first support reinforcement portion are respectively connected to the top side wall surface of the first support hole and the bottom side wall surface of the first support hole.

Further, in the double-layer thumb piano with semitone keys, at least one first depression reinforcement portion formed in the first depression hole of the front abutment frame, the at least one first depression reinforcement portion It is located between two of the adjacent first keys, and the opposite ends of the at least one first depression reinforcement portion are respectively connected to the top side wall surface of the first depression hole and the bottom side of the first depression hole Wall surface.

Further, in the double-layer thumb piano with semitone keys, wherein at least one second depression reinforcement part is formed in the second depression hole of the middle abutment frame, the at least one second depression reinforcement part It is located between two adjacent second keys, and the opposite ends of the at least one second depression reinforcement portion are respectively connected to the top side wall surface of the second depression hole and the bottom side of the second depression hole Wall surface; at least one first support reinforcement portion is formed in the first support hole of the middle support frame, the at least one first support reinforcement portion is located between two of the adjacent second keys, and the at least one first The opposite ends of a supporting reinforcing part are respectively connected to the top side wall surface of the first supporting hole and the bottom side wall surface of the first supporting hole; at least one first is formed in the first pressing hole of the front abutment frame The depressing reinforcing part, the at least one first depressing reinforcing part is located between two adjacent first keys, and the opposite ends of the at least one first depressing reinforcing part are respectively connected to the first depressing hole The top side wall surface and the bottom side wall surface of the first depression hole.

Further, in the double-layer thumb piano with semi-tone keys, the extension length of the front abutment frame, the middle abutment frame and the rear abutment frame in the lateral direction is between 8 and 16 cm.

Further, in the double-layer thumb piano with semitone keys, the rear abutment frame has at least one hollow hole.

The technical means adopted by this creation to achieve the intended purpose of creation will be further described in conjunction with the drawings and preferred embodiments of this creation.

Please refer to FIG. 1 to FIG. 4, the double-layer thumb piano with semitone keys in this creation includes a body 10, a pillow assembly 20, a front abutment frame 30, a middle abutment frame 50, and a rear abutment The backrest 60, the plural first keys 70 and the plural second keys 80; and in this embodiment, further includes a connecting plate 40.

The aforementioned body 10 has a longitudinal direction L and a transverse direction T. The aforementioned pillow assembly 20, front abutment frame 30, connecting plate 40, middle abutment frame 50 and rear abutment frame 60 are sequentially arranged in the instrument along the longitudinal direction L The body 10, and the pillow assembly 20, the front abutment frame 30, the connecting plate 40, the middle abutment frame 50 and the rear abutment frame 60 all extend along the transverse direction T, and the extension length of these parts along the transverse direction T is preferably Between 8 and 16 cm.

The aforementioned pillow assembly 20 has a body 21 and a cylinder 22 in this embodiment. The body 21 is fixed on the body 10 and the cylinder 22 is fixed on the top of the body 21. In this embodiment, the body 21 is a sleeper, and the column 22 is a metal round bar, but the materials of the body 21 and the column are not limited to this. The body 21 may also be other materials such as plastic or metal, and the body 21 and the cylinder 22 may be integrally formed.

The front abutment frame 30 has a first depression hole 31 which is a long hole extending in the lateral direction T, and specifically, the left end 311 and the right end 312 of the first depression hole 31 are adjacent to the front abutment frame 30 respectively Opposite ends of. The front abutment frame 30 is preferably a metal plate body.

The aforementioned connecting plate 40 is a metal plate body, which is fixed to the body 10 by screws (as shown in FIG. 5 ). The bottoms of the aforementioned front abutment frame 30 and the bottom of the middle abutment frame 50 are respectively connected to opposite sides of the connecting plate 40, and the front abutment frame 30 and the middle abutment frame 50 are fixed to the piano body by the connecting plate 40, And specifically, the front abutment frame 30, the connecting plate 40 and the middle abutment frame 50 are integrally formed elements, that is to say, after a metal plate body is bent into a U shape, the bottom and sides of the U shape The side forms the connecting plate 40, the front abutment frame 30, and the middle abutment frame 50, respectively. In other preferred embodiments, the front abutment frame 30 and the middle abutment frame 50 can also be separated from each other and fixed on the body 10 respectively.

The middle abutment frame 50 has a first supporting hole 51 and a second lower pressing hole 52, both the first supporting hole 51 and the second lower pressing hole 52 extend along the lateral direction T, and the height position of the second lower pressing hole 52 is high At the height position of the first support hole 51. In this embodiment, the left end 511 and the right end 512 of the first support hole 51 are adjacent to the opposite ends of the middle abutment frame 50 respectively, and the left end 521 and the right end 522 of the second depression hole 52 are adjacent to the middle abutment frame 50 respectively Opposite ends of. The middle abutment frame 50 is preferably a metal plate body.

In the present embodiment, the abutment frame 60 is screwed and fixed to the body 10 (as shown in FIG. 5 ). Specifically, the rear abutment frame 60 is generally an L-shaped metal plate, and in the second embodiment of the present invention (as shown in FIG. 8), one side of the rear abutment frame 60A may further penetrate to form a plurality of The hole 61A is hollow, but the number of the hole 61A may be only one depending on the situation.

The aforementioned first keys 70 are elongated and located above the body 10 and the pillow assembly 20; each first key 70 abuts the pillow assembly 20 downward, and penetrates the first of the front abutment frame 30 in the longitudinal direction L The lower pressing hole 31 and the first supporting hole 51 of the middle abutment frame 50, the top side wall surface of the first pressing hole 31 presses down the first key 70, the bottom side wall surface of the first supporting hole 51 and the top of the piano pillow assembly 20 Abut the first key 70 upwards, and specifically the pillar 22 of the pillow assembly 20 abuts the first key 70 upwards; thereby, the first key 70 is received by the front abutment frame 30 and the pillow assembly 20 and the center It is fixed above the body 10 by the clamping of the frame 50. In the present embodiment, the opposite ends of each first key 70 are a first mounting end 71 and a first plucking end 72, respectively. The first plucking end 72 is located on the side of the pillow assembly 20 opposite the front abutment frame 30 . Each first key 70 is preferably a metal dome.

Regarding the fixing method of the first key 70, it can also be explained as follows: the abutment position between the first support hole 51 of the middle abutment frame 50 and each first key 70 is defined as the first pressure point 1, and the first abutment frame 30 The position at which the first key 70 is pressed down by the pressure hole 31 is defined as the second pressure point 2, and the position where the cylinder 22 on the top of the pillow assembly 20 and each first key 70 is defined as the third pressure point 3, medium The abutment frame 50, the front abutment frame 30, and the pillow assembly 20 respectively fix the first key 70 located at the lower layer through the first pressure point 1, the second pressure point 2, and the third pressure point 3.

The aforementioned second keys 80 are elongated and located above the front abutment frame 30; each second key 80 abuts the front abutment frame 30 downward and penetrates the second lower portion of the abutment frame 50 in the longitudinal direction L The pressing hole 52 extends along the longitudinal direction L above the rear abutment frame 60; the top wall surface of the second pressing hole 52 depresses the second key 80, and the top of the rear abutment frame 60 abuts the second key 80 upward; Thereby, the second key 80 is clamped by the middle abutment frame 50 and the front abutment frame 30 and the rear abutment frame 60 to be fixed above the body 10. In this embodiment, the opposite ends of the second key 80 are a second mounting end 81 and a second plucking end 82 respectively. The second plucking end 82 is located on the side of the front abutment frame 30 opposite the rear abutment frame 60 . Each second key 80 is preferably a metal dome.

Regarding the fixing method of the second key 80, it can also be explained as follows: the abutment position between the top of the rear abutment frame 60 and each second key 80 is defined as the No. 4 pressure point 4, the second depressing hole of the intermediate abutment frame 50 52 The position where each second key 80 is pressed down is defined as No. 5 pressure point 5, the abutment position of the top of the front abutment frame 30 and each second key 80 is defined as the No. 6 pressure point 6, and the rear abutment frame 60, the middle The abutment frame 50 and the front abutment frame 30 respectively fix the second key 80 located on the upper layer through the fourth pressure point 4, the fifth pressure point 5, and the sixth pressure point 6.

Please refer to FIG. 6. In addition, in order to prevent the top side wall surface of the first pressing hole 31 of the front abutment frame 30 from bending and deforming upward due to the reaction force of the first key 70, the front abutment frame in this embodiment A plurality of first depression reinforcement portions 32 are formed in the first depression hole 31 of 30, which are respectively located between two adjacent first keys 70, and the opposite ends of each first depression reinforcement portion 32 are respectively connected The top side wall surface of the first down hole 31 and the bottom side wall surface of the first down hole are used to strengthen the strength of the top side wall surface of the first down hole 31 to reduce bending deformation. Specifically, a first depression reinforcement portion 32 is provided between all two adjacent first keys 70, so it is also equivalent to a plurality of first key grids formed on the front abutment frame 30, and a plurality of first keys 70 respectively pierce the plurality of first key pads, but not limited to this, the number of the first depression reinforcing portion 32 may be only one.

Please refer to FIG. 7 in addition. In addition, the second pressing hole 52 of the middle abutment frame 50 needs to bear the reaction force of the second key 80, so it may bend upward and deform like the first pressing hole 31, so in this embodiment A plurality of second depression reinforcement portions 53 are formed in the second depression holes 52 of the middle abutment frame 50, which are located between two adjacent second keys 80, and opposite ends of the second depression reinforcement portions 53 The top side wall surface of the second down hole 52 and the bottom side wall surface of the second down hole 52 are respectively connected to strengthen the top wall surface of the second down hole 52 to reduce bending deformation. Specifically, a second depression reinforcement portion 53 is provided between all adjacent two second keys 80, so it is also equivalent to a plurality of second key lattices formed on the middle abutment frame 50, and a plurality of second keys Each of the second key pads is pierced by 80, but not limited to this, and the number of second depression reinforcing portions 53 may be only one.

Furthermore, since the second depression reinforcement portion 53 transmits the reaction force of the second key 80 to the top of the first support hole 51 below the second depression hole 52, in order to avoid the deformation of the first support hole 51, the middle abutment frame A plurality of first support reinforcement portions 54 are formed in the first support hole 51 of 50, which are located between two adjacent second keys 80, and opposite ends of the first support reinforcement portion 54 are respectively connected to the first support holes 51 The top side wall surface of the first supporting hole and the bottom side wall surface of the first supporting hole to enhance the strength of the top side wall surface of the first supporting hole 51 to reduce bending deformation. Since both ends of the first support reinforcement portion 54 are respectively connected to the opposite side wall surfaces of the first support hole 51, it is also equivalent to forming a plurality of hollow spaces through the middle abutment frame 50. In other preferred embodiments, the number of the first supporting reinforcing portions 54 may be only one.

Finally, please refer to FIG. 6 and FIG. 7, the top side wall surface of the first depression hole 31 of the front abutment frame 30 protrudes a plurality of first protrusions 33, and each first protrusion 33 has an arc surface 331; The top of the arc surface 331 presses down one of the first keys 70 to reduce the contact area between each first key 70 and the first depressing hole 31, to prevent the first key 70 from generating abnormal noise when vibrating, and to increase the contact Pressure to prevent the first key 70 from being displaced and running away. In this embodiment, each first key 70 is correspondingly provided with a first protrusion 33, but it is not limited to this, and there may be only one first protrusion 33. For the same reason, a plurality of second protrusions 55 protrude from the top side wall surface of the second depression hole 52 of the middle abutment frame 50, each second protrusion 55 has an arc surface 551, and the tip of each arc surface 551 presses down One of the second keys 80 achieves the same effect as the first protrusion 33 described above.

Please refer to FIG. 10, when the composition is used, the two sides of the body 10 are held by both hands, and then the first plucked end 72 of the first key 70 and the second plucked end of the second key 80 are plucked with the thumb 82. Make the keys vibrate and sound.

Please refer to FIG. 8 and FIG. 9. In the second embodiment of the present creation, the second key 80A on the upper layer is composed of semitone keys and complement keys. The fill key is a supplementary layer, a fixed sound, while playing a strong sound. The first key 70 in the lower layer has no semitone keys, and the main sounds are arranged symmetrically from the bass range C, D, W, F, G, A, B to the treble range. Increasing the number of keys can increase the keys in the bass range.

In summary, the second key 80 is further provided above the first key 70 in order to simultaneously set the full-tone keys and the semi-tone keys in a limited space, so that the composition can play a semi-tone score. In addition, the related structure of clamping and fixing the first key 70 and the second key 80 also has the effect of easy maintenance.

The above is only the preferred embodiment of the creation, and does not limit the creation in any way. Although the creation has been disclosed in the preferred embodiment as above, it is not intended to limit the creation. Generally, a knowledgeable person can use the technical content disclosed above to make some changes or modifications to equivalent embodiments without departing from the scope of this creative technical solution. Any content that does not deviate from this creative technical solution is based on this Any simple modifications, equivalent changes, and modifications made to the above embodiments by the technical essence of the creation still fall within the scope of this creative technical solution.

10: piano body 20: Piano pillow assembly 21: Ontology 22: cylinder 30: front abutment 31: The first pressure hole 311: left end 312: right end 32: The first pressure reinforcement 33: The first protrusion 331: Curved surface 40: connection board 50: Medium yoke 51: First support hole 511: left end 512: right end 52: Second down hole 521: left end 522: right end 53: Second push-down reinforcement 54: First Support Reinforcement Department 55: Second protrusion 551: Curved surface 60: Rear abutment 70: first key 71: the first mounting end 72: The first plucked end 80: second key 81: Second mounting end 82: second plucked end L: Portrait T: landscape 60A: Rear abutment 61A: Hollow hole 1: No. 1 pressure point 2: No. 2 pressure point 3: No. 3 pressure point 4: No. 4 pressure point 5: No. 5 pressure point 6: No. 6 pressure point

FIG. 1 is a perspective view of the first embodiment of the creation. FIG. 2 is an exploded view of some components of the first embodiment of the creation. FIG. 3 is a schematic partial cross-sectional view of the first embodiment of the creation. Fig. 4 is a top view of the first embodiment of the creation. FIG. 5 is a top view of the first embodiment of the creation without the first key and the second key. 6 is a schematic front view of the front abutment frame of the first embodiment of the creation. FIG. 7 is a schematic front view of the middle abutment frame of the first embodiment of the creation. 8 is a schematic structural diagram of a rear abutment frame according to a second embodiment of the creation. 9 is a schematic structural diagram of a front abutment frame, a connecting plate, and a middle abutment frame according to a second embodiment of the creation. FIG. 10 is a schematic diagram of the top view of the first embodiment of the creation.

10: piano body

20: Piano pillow assembly

21: Ontology

22: cylinder

30: front abutment

40: connection board

50: Medium yoke

60: Rear abutment

70: first key

71: the first mounting end

72: The first plucked end

80: second key

81: Second mounting end

82: second plucked end

Claims (10)

A double-layer thumb piano with semitone keys, comprising: A piano body having a longitudinal direction and a lateral direction, a piano pillow assembly, a front abutment frame, a middle abutment frame and a rear abutment frame are sequentially arranged along the longitudinal direction on the piano body, and the piano pillow assembly, The front abutment frame, the middle abutment frame and the rear abutment frame all extend along the lateral direction; The front abutment frame has a first depression hole, which extends in the lateral direction; The middle abutment frame has a first supporting hole and a second downward pressing hole, the first supporting hole and the second downward pressing hole both extend along the lateral direction, and the height position of the second downward pressing hole is higher than the The height position of the first support hole; A plurality of first keys, which are elongated and located above the body and the pillow assembly; each of the first keys abuts the pillow assembly downwards, and penetrates the front abutment frame along the longitudinal direction A first pressing hole and the first supporting hole of the middle abutting frame; the top side wall surface of the first pressing hole presses down the first keys, the bottom side wall surface of the first supporting hole and the piano pillow assembly The top of the abuts the first key; A plurality of second keys, which are elongated and located above the front abutment frame; each second key abuts the front abutment frame downward and penetrates the second of the middle abutment frame in the longitudinal direction Press down the hole and extend in the longitudinal direction above the rear abutment frame; the top wall surface of the second down hole presses down the second keys, the top of the rear abutment frame abuts the second Piano keys Wherein, the height positions of the second keys are higher than the height positions of the first keys. Double-layer thumb piano with semitone keys as described in claim 1, wherein: The double-layer thumb piano with semitone keys further includes a connecting plate screwed and fixed to the body, the bottom of the front abutment frame and the bottom of the middle abutment frame are respectively connected to opposite sides of the connecting plate , And the front abutment frame, the connecting plate and the middle abutment frame are integrally formed; The rear abutment frame is screwed and fixed to the body. The double-layer thumb piano with semitone keys according to claim 1 or 2, wherein the top side wall surface of the first depression hole of the front abutment frame protrudes at least one first protrusion, the at least one first The protrusion has an arc surface; the top of the arc surface of the at least one first protrusion depresses one of the first keys. The double-layer thumb piano with semitone keys according to claim 1 or 2, wherein the top side wall surface of the second depression hole of the middle abutment frame protrudes with at least one second protrusion, the at least one second The protrusion has an arc surface; the top of the arc surface of the at least one second protrusion depresses one of the second keys. The double-layer thumb piano with semitone keys according to claim 1 or 2, wherein at least one second depression reinforcing portion formed in the second depression hole of the middle abutment, the at least one second depression The reinforcement part is located between two adjacent second keys, and the opposite ends of the at least one second depression reinforcement part are respectively connected to the top side wall surface of the second depression hole and the second depression hole The bottom wall surface. The double-layer thumb piano with semitone keys according to claim 1 or 2, wherein at least one first support reinforcement portion is formed in the first support hole of the middle support frame, the at least one first support reinforcement portion is located at Between two adjacent second keys, and opposite ends of the at least one first support reinforcing portion are respectively connected to the top side wall surface of the first support hole and the bottom side wall surface of the first support hole. Double-layer thumb piano with semitone keys as described in claim 1 or 2, wherein: At least one first depression reinforcement portion is formed in the first depression hole of the front abutment frame, the at least one first depression reinforcement portion is located between two of the adjacent first keys, and the at least one The opposite ends of the first pressing-down reinforcing portion are respectively connected to the top sidewall surface of the first pressing-down hole and the bottom sidewall surface of the first pressing-down hole. Double-layer thumb piano with semitone keys as described in claim 1 or 2, wherein: At least one second depression reinforcement portion is formed in the second depression hole of the middle abutment frame, the at least one second depression reinforcement portion is located between two of the adjacent second keys, and the at least one The opposite ends of the second depressing reinforcing portion are respectively connected to the top side wall surface of the second depressing hole and the bottom side wall surface of the second depressing hole; At least one first support reinforcement portion is formed in the first support hole of the middle abutment frame, the at least one first support reinforcement portion is located between two adjacent second keys, and the at least one first support The opposite ends of the reinforcing part are respectively connected to the top side wall surface of the first support hole and the bottom side wall surface of the first support hole; At least one first depression reinforcement portion is formed in the first depression hole of the front abutment frame, the at least one first depression reinforcement portion is located between two of the adjacent first keys, and the at least one The opposite ends of the first pressing-down reinforcing portion are respectively connected to the top sidewall surface of the first pressing-down hole and the bottom sidewall surface of the first pressing-down hole. The double-layer thumb piano with semitone keys according to claim 1 or 2, wherein the extension lengths of the front abutment frame, the middle abutment frame and the rear abutment frame in the lateral direction are between 8 and 16 cm. The double-layer thumb piano with semitone keys according to claim 1 or 2, wherein the rear abutment frame has at least one hollow hole.

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