Independently installed and adjusted double-layered keyboard thumb piano

Abstract

The invention discloses a thumb piano with double-layer keys that can be independently installed and adjusted. An independent supporting mechanism and a fixing mechanism are used, so that each key can be independently installed and adjusted. Only one specification of keys can be used, or keys of multiple specifications can be used, so that the manufacture, installation and replacement of keys are more convenient. Various scale arrangements can achieve alignment of the key playing ends, so that the hand feel is more comfortable. When noise or mute occurs, the tension of the keys can be adjusted to solve the problem.

Description

Technical Field

[0001] The invention relates to the technical field of musical instruments, in particular to an improved thumb piano. Background Art

[0002] The thumb piano is a traditional musical instrument originated from Africa, generally including a resonance box or a soundboard and 1 to 2 rows of elastic steel sheets. The ends of the steel sheets are plucked with the thumbs of both hands to make the steel sheets vibrate and produce sound. The existing thumb pianos have the problems of keys being installed with steel sheets of various lengths, too many manufacturing specifications, misaligned playing ends, or long in the middle and short on both sides, or long on one side and short on the other, uncomfortable playing feel, difficult to adjust when noise or mute occurs, and troublesome installation and replacement of keys. Summary of the invention

[0003] In order to overcome the problems in the prior art of too many key manufacturing specifications, uncomfortable playing end misalignment, difficulty in adjustment when noise and mute occur, and troublesome key installation and replacement, the present invention provides a double-layer key thumb piano that can be independently installed and adjusted.

[0004] The technical solution adopted by the present invention to solve the technical problem is: using an independent supporting mechanism and a fixing mechanism, so that each key can be installed and adjusted independently; the playing ends of the keys are installed in a horizontally aligned manner, and the upper keys are installed backwards.

[0005] By using the existing key specifications and parameters, the effective vibration length of each note in the used scale is measured, and the playing end of the key is aligned to obtain the position of the front end fulcrum of the key, and then offset backward by the same distance to obtain the position of the rear end fulcrum; a point of fixed proportion is taken between the front end fulcrum and the rear end fulcrum, such as the midpoint, to obtain the position of the key's downward pressure fixed point; taking the scale from left to right from bass to treble as an example, the front end fulcrum line, the rear end fulcrum line and the downward pressure fixed point line are three parallel lines inclined from the upper left corner to the lower right corner; according to the retreat distance of the upper keys, the three parallel lines are offset by this distance as a whole to obtain the front end fulcrum line, the rear end fulcrum line and the downward pressure fixed point line of the upper keys; the long side of the bottom plate is parallel to the above-mentioned line, and the short side is parallel to the key, so the bottom plate plane is a parallelogram; positioning holes are opened in the bottom plate according to the position of the downward pressure fixed point, and the installation position of the fixing mechanism is obtained.

[0006] The same effect can be achieved by using the above method for other scale arrangements.

[0007] The above-mentioned fixing mechanisms are of three types: single blocks, columns and inverted T-columns; the single blocks and columns have fixing holes at the bottom, and the fixing parts pass through the positioning holes of the bottom plate into the fixing holes to realize the connection between the single block or the column and the bottom plate; the single blocks and columns have large through holes at the waist for the keys to pass through, and adjustment holes at the top, and the adjusting parts pass through the adjustment holes to touch the keys in the large through holes, and the tension of the keys is changed by changing the pressure applied by the adjusting parts to the keys; the difference of the inverted T-column is that there is no fixing hole at the bottom, and there is an extra circle of column caps, which pass through the positioning holes from bottom to top during installation, and the other features are the same as the columns.

[0008] The above-mentioned single block has two specifications, high and low. The high single block is installed with the upper keys, and the low single block is installed with the lower keys. The bottom of the single block has at least two fixing holes.

[0009] The above-mentioned upright posts and inverted T-posts are available in two specifications, high and low. The high ones are used to install the upper piano keys, while the low ones are used to install the lower piano keys.

[0010] The supporting mechanism mentioned above is used to provide a front-end fulcrum and a rear-end fulcrum, and there are four solutions.

[0011] The first solution of the supporting mechanism mentioned above is to drill a small through hole horizontally at both ends of the large through hole of the single block near the exit, and use a cross bar to pass through the small through holes and implant it into the single block. The cross bar forms the front end fulcrum and the rear end fulcrum, and is integrated with the single block. This single block is connected to the base plate, and the keys can be installed. The single block can also be installed directly without the cross bar and the front end fulcrum and the rear end fulcrum.

[0012] In the above-mentioned supporting mechanism solution No. 2, the front end fulcrum and the rear end fulcrum of the same piano key are realized on one part, that is, an integrated supporting part, whose side elevation is in the shape of the letter U, and a positioning hole is opened on the horizontal bottom surface for the fixing part to pass through and connect to the column; the front end fulcrum and the rear end fulcrum are both provided with recesses to prevent the keys from moving to the left and right; the integrated supporting part has two specifications, high and short, the high one is used to install the upper keys, and the short one is used to install the lower keys; when the integrated supporting part is used in combination with the inverted T-column, it is changed to be installed from bottom to top through the limiting holes of the bottom plate.

[0013] The third solution of the supporting mechanism mentioned above combines the front end fulcrums of the upper and lower keys into one part, namely the front end support, and the rear end fulcrums into one part, namely the rear end support; since the rear end fulcrum is obtained by the overall offset of the front end fulcrum, the front end support and the rear end support can use parts of the same specification, whose cross-section is in the shape of the letter J, and whose higher vertical facade has key holes for the keys to pass through, and whose horizontal bottom surface is a parallelogram with mounting holes for the mounting screws to pass through; recesses are provided at the front end fulcrum and the rear end fulcrum to prevent the keys from moving to the left and right; when the inverted T-column is used in conjunction with the front end support and the rear end support, it is installed from bottom to top through the positioning holes of the base plate.

[0014] In the above-mentioned support mechanism solution four, the front end fulcrums of the upper and lower keys are combined into one part, namely the front end support member, and the rear end fulcrums are combined and combined with the bottom plate into one part, namely the L-shaped support member; the front end support member is the same as solution three; the L-shaped support member has a cross-section in the shape of the letter L, and its vertical facade has key holes for the keys to pass through, and its horizontal bottom surface is a parallelogram with mounting holes for mounting screws to pass through and positioning holes for fixings to pass through, and recesses are provided at the rear end fulcrums to prevent the keys from moving to the left and right; when the inverted T-column is used in combination with the L-shaped support member, it is installed from bottom to top through the positioning holes of the L-shaped support member.

[0015] The mounting surface of the resonance body is pre-grooved for the fixings, inverted T-pillars and integrated support members. The support mechanism and the fixing mechanism are mounted on the resonance body using mounting screws that pass through the mounting holes on the front support member, rear support member, L-shaped support member and base plate. The keys are then installed one by one, aligned with the playing end, and the corresponding tools are used to individually change the pressure applied by each adjusting member on the key to change the tension of each key, thereby solving noise and mute problems. If the keys need to be replaced, the same operation is performed on the adjusting member.

[0016] The corresponding tools mentioned above refer to the hexagonal keys, wrenches, screwdrivers, etc. corresponding to the adjusting parts.

[0017] The above-mentioned keys include but are not limited to tongue-shaped keys and round-shaped keys.

[0018] The above-mentioned columns and inverted T-columns include but are not limited to cylindrical, elliptical, square, hexagonal and octagonal columns.

[0019] The above-mentioned key holes include but are not limited to square holes, circular holes, and polygonal holes.

[0020] The above-mentioned adjusting parts include but are not limited to hexagon socket headless screws, hexagon socket screws, cross screws, and slotted screws.

[0021] The beneficial effects of the present invention are that only one specification of keys can be used, or keys of multiple specifications can be used, which makes it more convenient to manufacture, install and replace the keys; various scale arrangements can achieve alignment of the key playing ends, which makes the hand feel more comfortable; when noise or mute occurs, the tension of the keys can be adjusted to solve the problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 This is a top view of a single-piece finished product;

[0024] Figure 2 For a single block Figure 1 Sectional view along line AA;

[0025] Figure 3 It is a schematic diagram for installation of monolithic parts;

[0026] Figure 4 This is a schematic diagram of the installation of parts for the single-piece crossbar-free version;

[0027] Figure 5 It is a schematic diagram of a single-piece finished product;

[0028] Figure 6 It is a top view of the column-type integrated support plate;

[0029] Figure 7 It is a column type integrated support plate edge Figure 6 Sectional view of the middle BB line;

[0030] Figure 8 This is a schematic diagram of the installation of the parts of the column-type integrated support plate;

[0031] Fig. 9 This is a schematic diagram of the finished product of the column-type integrated support plate;

[0032] Fig.10 It is a top view of an inverted T-column;

[0033] Fig.11 Inverted T-column Fig.10 Section view of the mid-CC line;

[0034] Fig.12 This is a schematic diagram of the installation of inverted T-column parts;

[0035] Fig.13 This is a schematic diagram of the finished product of the inverted T-column type;

[0036] Fig.14 It is a top view of the front and rear support plates of the column type;

[0037] Fig.15 Front and rear support edge of the column Fig.14 Sectional view of the mid-DD line;

[0038] Fig.16 This is a schematic diagram of the installation of the parts of the column type front and rear support plates;

[0039] Fig.17 This is a schematic diagram of the finished product of the column-type front and rear support plates;

[0040] Fig.18 It is a top view of the column type L-shaped support plate;

[0041] Fig.19 For the column type L-shaped support plate edge Fig.18 Sectional view along line EE;

[0042] Fig. 20This is a schematic diagram of the installation of the column type L-shaped support plate parts;

[0043] Fig.21 This is a schematic diagram of the finished product of the column-type L-shaped support plate;

[0044] In the figure, 1. resonator, 2. piano key, 3. bottom plate, 4. mounting hole, 5. mounting screw, 6. positioning hole, 7. fixing hole, 8. fixing part, 9. adjustment hole, 10 adjustment part, 11. large through hole, 12. small through hole, 13. cross bar, 14. single block, 15. column, 16. integrated support part, 17. notch, 18. inverted T column, 19. limit hole, 20. front end support part, 21. rear end support part, 22. L-shaped support part, 23. piano key hole, 24. groove. DETAILED DESCRIPTION

[0045] [Example 1]

[0046] The crossbar 13 is pre-implanted into the single block 14; the fixing member 8 is used to pass through the positioning hole 6 of the bottom plate 3 from bottom to top and enter the fixing hole 7 at the bottom of the single block 14 to complete the connection between each single block 14 and the bottom plate 3; the single block 14 has two specifications, high and low, the low single block is in the front row, and the lower keys 2 are installed, and the high single block is in the back row, and the upper keys 2 are installed; the part of the fixing member 8 protruding from the bottom plate 3 is aligned with the groove 24 of the resonance body 1, and the mounting screw 5 is used to pass through the mounting hole 4 of the bottom plate 3 and implanted into the resonance body 1 to complete the connection between the bottom plate 3 with the single block 14 and the resonance body 1; the keys 2 are passed through the large through hole 11 from the position above the crossbar 13 of the single block 14 in turn, and the playing end is aligned, and the adjusting member 10 passes through the adjusting hole 9 to touch the key 2, and the tuner is used to calibrate the tone of each key 2, and the corresponding tools are used to adjust the vibration length of the key 2 and the pressure of the adjusting member 10 to complete the installation. Figure 1 , Figure 2 , Figure 3 , Figure 5 shown.

[0047] [Example 2]

[0048] The installation method is the same as that of Example 1, except that the monoblock 14 does not have an implanted crossbar 13. Figure 4 shown.

[0049] [Example 3]

[0050] Use the fixing member 8 to pass through the positioning holes 6 of the bottom plate 3 and the integrated support member 16 from bottom to top, and enter the fixing hole 7 at the bottom of the column 15 to complete the connection between each column 15, the integrated support member 16 and the bottom plate 3; the columns 15 and the integrated support member 16 are of two specifications, high and low, the low ones are in the front row, and the lower keys 2 are installed, and the high ones are in the back row, and the upper keys 2 are installed; the part of the fixing member 8 protruding from the bottom plate 3 is aligned with the groove 24 of the resonance body 1, and the mounting screw 5 is used to pass through the mounting hole 4 of the bottom plate 3 and implanted into the resonance body 1 to complete the connection with the resonance body 1; the keys 2 are passed through the large through holes 11 in turn without going beyond the notch 17, and aligned with the playing end, and the adjusting member 10 passes through the adjusting hole 9 to touch the key 2; use a tuner to calibrate the tone of each key 2, and use the corresponding tools to adjust the vibration length of the key 2 and the pressure of the adjusting member 10 to complete the installation. Figure 6 , Figure 7 , Figure 8 , Fig. 9 shown.

[0051] [Example 4]

[0052] First, pass the integrated support member 16 from bottom to top through the limiting hole 19 of the bottom plate 3, and then pass the inverted T-pillar 18 from bottom to top through the integrated support member 16 and the positioning hole 6 of the bottom plate 3 in turn, to complete the connection between each inverted T-pillar 18, the integrated support member 16 and the bottom plate 3; the inverted T-pillar 18 and the integrated support 16 are of two specifications, high and low, the low ones are in the front row, and the lower keys 2 are installed, and the high ones are in the back row, and the upper keys 2 are installed; the fixing member 8 and the integrated support member 16 protruding from the bottom plate 3 are aligned with the groove 24 of the resonance body 1, and the mounting screws 5 are used to pass through the mounting holes 4 of the bottom plate 3 and implanted into the resonance body 1 to complete the connection with the resonance body 1; the keys 2 are passed through the large through holes 11 of the inverted T-pillar 18 in turn, aligned with the playing end, and do not go beyond the notch 17, and the adjustment member 10 passes through the adjustment hole 9 to touch the key 2; use a tuner to calibrate the tone of each key 2, and use corresponding tools to adjust the vibration length of the key 2 and the pressure of the adjustment member 10 to complete the installation. Fig.10 , Fig.11 , Fig.12 , Fig.13 shown.

[0053] [Example 5]

[0054] Use the fixing member 8 to pass through the positioning hole 4 of the bottom plate 3 from bottom to top, and enter the fixing hole 7 at the bottom of the column 15 to complete the connection between each column 15 and the bottom plate 3; the columns 15 have two specifications, high and low, the low ones are in the front row, and the lower keys 2 are installed, and the high ones are in the back row, and the upper keys 2 are installed; the part of the fixing member 8 protruding from the bottom plate 3 is aligned with the groove 24 of the resonance body 1, and the mounting screw 5 is used to pass through the front support member 20, the rear support member 21 and the mounting hole 4 of the bottom plate 3, and implanted into the resonance body 1 to complete the connection with the resonance body 1; the upper key 2 passes through the large through hole 11, aligns with the playing end, and does not go beyond the notch 17, the lower key 2 passes through the key hole 23, the large through hole 11, and the key hole 23 in turn, aligns with the playing end, and the adjusting member 10 passes through the adjusting hole 9 to touch the key 2; use a tuner to calibrate the tone of each key 2, and use the corresponding tools to adjust the vibration length of the key 2 and the pressure of the adjusting member 10 to complete the installation. Fig.14 , Fig.15 , Fig.16 , Fig.17 shown.

[0055] [Example 6]

[0056] The installation method is similar to that of Example 5, except that the upright column 15 is replaced by an inverted T-column 18 , and no fixing parts are required. The inverted T-column 18 is installed from bottom to top through the positioning hole 6 of the base plate 3 .

[0057] [Example 7]

[0058] The installation method is similar to that of Example 5, except that the rear support member 21 and the bottom plate 3 are replaced with an L-shaped support member 22. Fig.18 , Fig.19 , Fig. 20 , Fig.21 shown.

[0059] [Example 8]

[0060] The installation method is similar to that of Example 7, except that the upright column 15 is replaced by an inverted T-column 18 , and the fixing member 8 is not required. The inverted T-column 18 is installed from bottom to top through the positioning hole 6 of the L-shaped support member 22 .

Claims

1. An independently installed and adjustable double-layered key thumb piano, comprising a resonant body (1), double-layered keys (2), a fixing mechanism, a supporting mechanism and an installation mechanism, characterized in that: The fixing mechanism and supporting mechanism of each key (2) can be installed independently, and each fixing mechanism can be adjusted independently; the fixing mechanisms include three types: a single block (14), a column (15) and an inverted T column (18); the bottom of the single block (14) and the column (15) are provided with a fixing hole (7), and a fixing member (8) passes through a positioning hole (6) of the bottom plate (3) and enters the fixing hole (7) to achieve the connection between the single block (14) or the column (15) and the bottom plate (3); the waist of the single block (14) and the column (15) are provided with a large through hole (11) for the key (2) to pass through, and the top is provided with an adjustment hole (9), and the adjustment member (10) passes through the adjustment hole (9) to touch the key (2) in the large through hole (11), and the tension of the key (2) is changed by changing the pressure applied by the adjustment member (10) to the key (2); The difference between the column (18) and the upright column (18) is that there is no fixing hole (7) at the bottom, but an extra circle of column caps, which pass through the positioning hole (6) from bottom to top during installation. The other features are the same as those of the upright column (15); the supporting mechanism provides a front fulcrum and a rear fulcrum; the cross bar (13) passes through the small through hole (12) of the monoblock (14) and is implanted into the monoblock (14), so that the front fulcrum, the rear fulcrum and the monoblock (14) are integrated into one, or an integrated support member (16) is used to provide the front fulcrum and the rear fulcrum, or an independent front support member (20) and a rear support member (21) are used to provide the front fulcrum and the rear fulcrum; the fulcrums of the integrated support member (16), the front support member (20) and the rear support member (21) are all provided with notches (17); the playing end of the keys (2) is installed in a horizontally aligned manner, and the upper keys (2) are installed backwards, The monoblock (14), the upright (15), the inverted T-pillar (18), and the integrated support member (16) are all of two specifications, high and low. The high ones are used to mount the upper piano keys (2), while the low ones are used to mount the lower piano keys (2). The bottom of the single block (14) has at least two fixing holes (7); the single block (14) is not implanted with a crossbar (13), does not require a front end fulcrum and a rear end fulcrum, and can also be directly installed with a piano key (2) for use.

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