Magnetic reset type string plucking device for plume key musical instrument

Abstract

The utility model discloses a magnetic force reset type string plucking device used for a plume key musical instrument, comprising a push rod, a tongue strip, a plucking sheet, a first magnet and a second magnet, the middle lower part of the tongue strip is installed in an installation through hole at the upper end of the push rod through a pin, the plucking sheet is installed at the upper part of the tongue strip, the hole wall at the lower end of the installation through hole is provided with a push rod blind hole recessed downwards, and the first magnet and the second magnet are arranged in the push rod blind hole. The first magnet is installed in the ejector rod blind hole, the lower end of the tongue strip is provided with a tongue strip blind hole which is concave upwards, the second magnet is installed in the tongue strip blind hole, and the upper end of the first magnet and the lower end of the second magnet attract each other. According to the utility model, the two magnets which attract each other are used as the reset parts to replace the traditional elastic strip, so that the service life of the reset parts is obviously prolonged, a good piano sound effect can be kept for a long time, the maintenance cost is reduced, and the normal use of the plume key piano is ensured; meanwhile, the two magnets are installed in a hidden mode, the external space of the ejector rod is not occupied, and product assembly and application are facilitated.

Description

Technical Field

[0001] The utility model relates to a string-plucking device for a harpsichord, in particular to a magnetic force reset type string-plucking device for a harpsichord. Background Art

[0002] The harpsichord is a plucked string instrument, also known as the fortepiano and harpsichord. Its strings are plucked with a feather tube. Each string is plucked by a feather tube or a hard-leather plectrum fixed to the wooden top rod at the end of each key. Now the feather tube or hard-leather plectrum is generally referred to as a plectrum or a pick (hereinafter referred to as a pick).

[0003] The related parts used to pluck the strings are collectively referred to as the harpsichord's plucking device, such as Figures 1 - 3 As shown, the traditional string-plucking device includes a traditional top rod 11, a traditional tongue strip 3, a traditional plectrum 2 and an elastic strip 8. The upper end of the vertical traditional top rod 11 is provided with a traditional mounting through hole 1 for mounting the traditional tongue strip 3. The middle and lower parts of the traditional tongue strip 3 are mounted in the traditional mounting through hole 1 through a traditional pin 7. The traditional pin 7 passes through the traditional tongue strip through hole 6 in the middle and lower parts of the traditional tongue strip 3 and its two ends respectively pass through the traditional pin holes 4 on the opposite side hole walls of the traditional mounting through hole 1. The traditional tongue strip 3 can rotate around the center line of the traditional pin 7. The traditional plectrum 2 is mounted on the upper part of the traditional tongue strip 3. The lower end of the elastic strip 8 serving as a reset component is mounted in the mounting groove 9 of the traditional top rod 11 through a mounting seat 10. The upper end of the elastic strip 8 is placed in the corresponding groove 5 on the traditional tongue strip 3. The upper end of the elastic strip 8 presses the lower part of the traditional tongue strip 3 so that the traditional tongue strip 3 can automatically reset after rotation. When in use, after pressing a key (not shown in the figure), the traditional top rod 11 at the end of the key moves upward, and the end of the traditional pick 2 will contact the string (not shown in the figure) and produce a sound. In the process of the traditional pick 2 contacting the string, the traditional tongue bar 3 will rotate, and the elastic strip 8 has a tendency to prevent the traditional tongue bar 3 from rotating, so that the traditional pick 2 produces a certain thrust on the string and passes over the string upward to achieve the purpose of plucking the string and producing a sound. After the traditional pick 2 passes over the string, the user releases the key, the traditional top rod 11 moves downward, the traditional pick 2 passes over the string downward and resets together with the traditional tongue bar 3 under the action of the elastic strip 8, and the above process is repeated after the key is pressed next time.

[0004] The above traditional string plucking device has the following defects: First, since the elastic strip 8 needs to have appropriate elasticity, it needs to be designed thinner. After long-term use, it will deform or lose elasticity due to aging, directly affecting the sound effect of the piano, resulting in a lower working life of the elastic strip 8. Replacing the elastic strip 8 will increase the maintenance cost and affect the normal use of the harpsichord. Moreover, the installation of the elastic strip 8 will occupy the external space of the traditional ejector rod 11, which is not conducive to product assembly and application. Second, the traditional pin 7 is in direct contact with the hole wall of the traditional tongue strip through hole 6 of the traditional tongue strip 3. After long-term use, the traditional tongue strip through hole 6 of the traditional tongue strip 3 will become larger, causing the traditional tongue strip 3 to shake, which will affect the sound effect and result in a lower working life of the traditional pin 7 or the traditional tongue strip 3. Third, the traditional ejector rod 11 is a wooden or plastic ejector rod. The traditional pin 7 is in direct contact with the hole wall of the traditional pin hole 4. After long-term use, it will cause wear on the traditional pin hole 4. Moreover, the traditional pin hole 4 itself may also change due to changes in temperature and humidity, resulting in changes in the damping of the traditional pin 7, thereby causing changes in the thrust of the traditional pick 2 on the string, which will also affect the sound effect and result in a lower working life of the traditional ejector rod 11 or the traditional pin 7. Summary of the Invention

[0005] The purpose of the present invention is to provide a magnetic reset string plucking device for a harpsichord with a long working life of the reset component to solve the above problems.

[0006] The present invention realizes the above purpose through the following technical solutions:

[0007] A magnetic reset string plucking device for a harpsichord, including an ejector rod, a tongue strip and a pick. An installation through hole for installing the tongue strip is provided at the upper end of the vertical ejector rod. The middle and lower part of the tongue strip is installed in the installation through hole through a pin. The pin passes through the tongue strip through hole in the middle and lower part of the tongue strip and its two ends respectively pass through the pin holes on the opposite side hole walls of the installation through hole. The tongue strip can rotate around the center line of the pin. The pick is installed on the upper part of the tongue strip. The magnetic reset string plucking device for a harpsichord further includes a first magnet and a second magnet. A downwardly recessed ejector rod blind hole is provided on the lower end hole wall of the installation through hole. The first magnet is installed in the ejector rod blind hole. An upwardly recessed tongue strip blind hole is provided at the lower end of the tongue strip. The second magnet is installed in the tongue strip blind hole. The upper end of the first magnet and the lower end of the second magnet attract each other.

[0008] Preferably, in order to reduce the direct wear between the pin and the tongue strip to increase the working life, the magnetic reset string plucking device for a harpsichord further includes a tubular bushing. The bushing is sleeved outside the pin through its central through hole and is located in the tongue strip through hole.

[0009] Preferably, in order to better reduce the direct wear between the pin and the tongue strip to increase the working life, the bushing is a polytetrafluoroethylene bushing, and the lubricating characteristics of the polytetrafluoroethylene bushing can more effectively reduce the contact wear.

[0010] Preferably, in order to further improve the working life of the reset component, both the first magnet and the second magnet are neodymium iron boron magnets. The neodymium iron boron magnet can only lose about 5% of its magnetism in a hundred years, which is much higher than the working life of the traditional elastic strip.

[0011] Preferably, in order to reduce the wear of the pin hole on the ejector rod to increase the working life, the ejector rod is an ejector rod made of resin carbon fiber composite material.

[0012] The beneficial effects of the present utility model are as follows:

[0013] The present utility model uses two mutually attracting magnets as the reset component to replace the traditional elastic strip, significantly improving the working life of the reset component, being able to maintain a good piano sound effect for a long time, reducing the maintenance cost and facilitating the normal use of the harpsichord; at the same time, both magnets are installed in a hidden manner, which does not occupy the external space of the ejector rod and is conducive to product assembly and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional exploded view of the traditional string plucking device before assembly;

[0015] Figure 2 is one of the three-dimensional views of the traditional string plucking device after assembly, with the same viewing angle as Figure 1 the same;

[0016] Figure 3 is the second three-dimensional view of the traditional string plucking device after assembly, with a different viewing angle from Figure 2 the different;

[0017] Figure 4 is a three-dimensional exploded view of the magnetic force reset type string plucking device for the harpsichord according to the present utility model before assembly;

[0018] Figure 5 is one of the three-dimensional views of the magnetic force reset type string plucking device for the harpsichord according to the present utility model after assembly, with the same viewing angle as Figure 4 the same;

[0019] Figure 6 is the second three-dimensional view of the magnetic force reset type string plucking device for the harpsichord according to the present utility model after assembly, with a different viewing angle from Figure 5 the different. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described below with reference to the accompanying drawings:

[0021] As Figures 4 - 6 shown, the magnetic force resetting string plucking device for a harpsichord according to the present utility model includes a top rod 23, a tongue strip 12, a pick 13, a first magnet 18 and a second magnet 22. An installation through hole 16 for installing the tongue strip 12 is provided at the upper end of the vertically arranged top rod 23. The middle and lower part of the tongue strip 12 is installed in the installation through hole 16 through a pin 20. The pin 20 passes through a tongue strip through hole 14 in the middle and lower part of the tongue strip 12, and its two ends respectively pass through pin holes 17 on the opposite side walls of the installation through hole 16. The tongue strip 12 can rotate around the center line of the pin 20. The pick 13 is installed on the upper part of the tongue strip 12. A top rod blind hole 19 recessed downward is provided on the lower end hole wall of the installation through hole 16. The first magnet 18 is installed in the top rod blind hole 19. An upwardly recessed tongue strip blind hole 21 is provided at the lower end of the tongue strip 12. The second magnet 22 is installed in the tongue strip blind hole 21. The upper end of the first magnet 18 and the lower end of the second magnet 22 attract each other.

[0022] As Figures 4 - 6 shown, the present utility model also discloses the following various more optimized specific structures:

[0023] In order to reduce the direct wear between the pin 20 and the tongue strip 12 to increase the working life, the magnetic force resetting string plucking device for a harpsichord further includes a tubular bushing 15. The bushing 15 is sleeved outside the pin 20 through its central through hole and is located in the tongue strip through hole 14.

[0024] In order to better reduce the direct wear between the pin 20 and the tongue strip 12 to increase the working life, the bushing 15 is a polytetrafluoroethylene bushing. The lubricating characteristics of the polytetrafluoroethylene bushing can more effectively reduce the contact wear.

[0025] In order to further improve the working life of the reset component, both the first magnet 18 and the second magnet 22 are neodymium iron boron magnets. The neodymium iron boron magnet can lose only about 5% of its magnetism in a hundred years, which is much higher than the working life of the traditional elastic strip.

[0026] In order to reduce the wear of the pin hole 17 on the top rod 23 to increase the working life, the top rod 23 is a resin carbon fiber composite material top rod.

[0027] As Figure 3 and Figure 4As shown, during use, after pressing the key (not shown in the figure), the ejector rod 23 at the end of the key moves upward. The end of the pick 13 will contact the string (not shown in the figure) and produce a musical sound. During the contact between the pick 13 and the string, the tongue strip 12 will rotate. The suction force between the first magnet 18 and the second magnet 22 has a tendency to prevent the rotation of the tongue strip 12, so that the pick 13 generates a certain thrust on the string and moves upward over the string to achieve the purpose of plucking the string and producing a musical sound. After the pick 13 passes over the string, the user releases the key, the ejector rod 23 moves downward, the pick 13 moves downward over the string and resets together with the tongue strip 12 under the suction force between the first magnet 18 and the second magnet 22. The above process is repeated after the key is pressed next time.

[0028] Note: The mounting through-hole 16, pick 13, tongue strip 12, pin hole 17, tongue strip through-hole 14, pin 20, and ejector rod 23 in the above specific implementation content respectively correspond to the traditional mounting through-hole 1, traditional pick 2, traditional tongue strip 3, traditional pin hole 4, traditional tongue strip through-hole 6, traditional pin 7, and traditional ejector rod 11 in the background technology content. However, due to innovative improvements or adaptive changes in the relevant structures, different component names and marking numbers are adopted.

[0029] The above embodiments are only preferred embodiments of the present invention and do not limit the technical solutions of the present invention. Any technical solutions that can be achieved on the basis of the above embodiments without creative labor shall be regarded as falling within the scope of the patent rights of the present invention.

Claims

1. A magnetic resetting string-picking device for a harpsichord, comprising a top rod, a tongue bar and a plectrum, wherein the upper end of the vertical top rod is provided with a mounting through hole for mounting the tongue bar, the middle and lower part of the tongue bar is mounted in the mounting through hole by a pin, the pin passes through the tongue bar through hole in the middle and lower part of the tongue bar and its two ends respectively pass through the pin holes on the hole walls on the opposite sides of the mounting through hole, the tongue bar can rotate around the center line of the pin, and the plectrum is mounted on the upper part of the tongue bar, characterized in that: The magnetic resetting string-plucking device for harpsichord also includes a first magnet and a second magnet. The lower end hole wall of the mounting through hole is provided with a top rod blind hole recessed downward. The first magnet is mounted in the top rod blind hole. The lower end of the tongue bar is provided with a tongue bar blind hole recessed upward. The second magnet is mounted in the tongue bar blind hole. The upper end of the first magnet and the lower end of the second magnet attract each other.

2. The magnetic resetting string-plucking device for harpsichord according to claim 1, characterized in that: The magnetic resetting string-plucking device for harpsichord further comprises a tubular shaft sleeve, which is sleeved outside the pin through its own central through hole and is located in the tongue bar through hole.

3. The magnetic resetting string-picking device for harpsichord according to claim 2, characterized in that: The shaft sleeve is a polytetrafluoroethylene shaft sleeve.

4. The magnetic resetting string-plucking device for harpsichord according to claim 1, 2 or 3, characterized in that: The first magnet and the second magnet are both neodymium iron boron magnets.

5. The magnetic resetting string-picking device for harpsichord according to claim 1, 2 or 3, characterized in that: The top rod is a top rod made of a resin and carbon fiber composite material.

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