Piano key height adjustable balance pin

Abstract

The utility model provides a kind of height-adjustable balance pin of piano key, belong to piano manufacturing technical field. Including pin body and connecting body, connecting body is set in keyboard middle grade, the bottom of pin body is screw thread connection with the connecting body in keyboard middle grade, the top end of pin body is fixedly connected with operating portion and is passed through key, pin body is fixedly connected with supporting portion, the bottom surface of key is contacted with supporting portion, and the movable hole for key is set on key with supporting portion as fulcrum relative pin body rotation. Pin body that can emerge from the top of key adopts hexagonal wrench to rotate hexagonal bolt head, so that pin body is rotated relative to the connecting body in keyboard middle grade, by pin body and connecting body screw thread cooperation, so that in the case without disassembling the structure around key, pin body can be directly relative to keyboard middle grade lifting, complete the adjustment of key height, with the effect of improving the convenience and adjustment efficiency of key height adjustment operation.

Description

Technical Field

[0001] This utility model relates to the field of piano manufacturing technology, and in particular to an adjustable height balancing pin for piano keys. Background Technology

[0002] Patent CN102568444A discloses a piano key weight adjustment system. Its structure includes: a backplate, screws, keys, a middle plate, key surfaces, a fixing strip, lead weights, a balance pin, and a keyboard center block. The key surfaces, middle plate, and backplate are located on the keys and are glued to them. The keys are located above the keyboard center block, and the lead weights are located inside the keys. The keys, lead weights, and fixing strip are precisely assembled and fixed with screws. The backplate and key surfaces are located at opposite ends of the keys, and a retaining pin is installed on the backplate. A groove is provided on one end of the key near the backplate for placing the lead weight. A middle plate is located between the key surfaces and the backplate. The keyboard center block is located between the backplate and the key surfaces, and a balance pin is fixed on the keyboard center block as a fulcrum for the keys.

[0003] When a piano is manufactured and installed, the height of the keys needs to be adjusted. After the piano is put into use, the height of the piano keys also needs to be adjusted regularly. The traditional way to adjust the height of the piano keys is to use paper shims. Paper shims are placed under the piano keys or removed, and then screws installed inside the piano keys are used to press the paper shims in place. The height of the piano keys is adjusted by the thickness of the paper shims.

[0004] However, when adjusting the key height by using paper pads, the keys need to be removed before the paper pads can be placed on the balance pins. Since there are many piano keys, disassembling each key, installing paper pads, and reinstalling the keys is a heavy workload for the tuning staff and affects the production efficiency of the piano. Utility Model Content

[0005] In view of the above problems, this utility model provides an adjustable height balancing pin for piano keys.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An adjustable height balancing pin for piano keys is provided, comprising a pin body and a connecting body. The connecting body is disposed within the middle section of the keyboard. The bottom of the pin body is threadedly connected to the connecting body in the middle section of the keyboard. The pin body passes through the piano key. A support part is fixedly connected to the pin body. The bottom surface of the piano key contacts the support part. The piano key has a movable hole for rotating relative to the pin body with the support part as a fulcrum. An operating part for operating the rotation of the pin body is provided on the top of the pin body.

[0007] Furthermore, the connector includes a connecting bolt, which is fixedly installed inside the keyboard center section, and the bottom end of the pin body is threadedly connected to the connecting bolt. The operating part includes a hexagonal bolt head, which is coaxially fixedly connected to the top of the pin body.

[0008] Furthermore, the pin body is connected to the connecting bolt via a damped thread.

[0009] Furthermore, the connecting bolt includes a bolt housing and a connecting sleeve. The connecting sleeve is coaxially fixed inside the bolt housing. The connecting sleeve is made of nylon and has a threaded hole coaxially opened on it. The bottom end of the pin body is interference-fitted with the connecting sleeve.

[0010] Furthermore, the support includes a support pad, the upper surface of which is spherical, and the upper surface of the support pad slides in contact with the bottom surface of the piano keys.

[0011] Furthermore, the support includes a support plate, which is fixedly connected to the pin body, and a support pad is fitted onto the pin body and located above the support plate.

[0012] The beneficial effects of this utility model are as follows: During the installation and adjustment of the piano, by using an external hexagonal wrench to rotate the hexagonal bolt head of the pin body protruding from above the keys, the pin body rotates relative to the connecting body in the middle of the keyboard. Through the threaded engagement between the pin body and the connecting body, the pin body can be raised and lowered directly relative to the middle of the keyboard without disassembling the structure around the keys, thereby adjusting the height of the keys and improving the convenience and efficiency of the key height adjustment operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the piano key structure according to an embodiment of this application.

[0014] Figure 2 This is a schematic diagram of the mounting structure of the balance pins on the piano keys according to an embodiment of this application.

[0015] Figure 3 This is a cross-sectional schematic diagram of the mounting structure of the balance pins on the piano keys according to an embodiment of this application.

[0016] Among them, 1. piano key; 2. keyboard middle section; 3. pin body; 4. connector; 41. bolt shell; 42. connecting sleeve; 5. support part; 51. support pad; 52. support plate; 6. operating part. Detailed Implementation

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] This application discloses an adjustable height balance pin for a piano key 1, referring to... Figure 1 and Figure 2 The keyboard includes a pin body 3 and a connecting body 4, with the connecting body 4 housed within the keyboard center section 2. A support portion 5 is integrally fixed to the pin body 3. The pin body 3 is positioned above the support portion 5 and passes through the key 1. A movable hole for the pin body 3 to pass through is provided in the key 1. The movable hole has a cross-section that is a strip-shaped hole along the length of the key 1. The support portion 5 contacts both sides of the movable hole on the bottom wall of the key 1. The bottom end of the pin body 3 is threadedly connected to the connecting body 4 within the keyboard center section 2. The top of the pin body 3 passes through the movable hole and is connected to an operating portion 6 for rotating the pin body 3.

[0019] When adjusting the height of piano key 1, it is not necessary to disassemble key 1. The operating part 6 extends from the top of key 1 through the pin body 3 to drive the pin body 3 to rotate. With the pin body 3 and the connecting body 4 threadedly connected, the pin body 3 can move up and down relative to the keyboard center 2, thereby adjusting the height of the support part 5 that supports key 1, completing the adjustment of the height of the movable end of key 1, and improving the convenience and efficiency of adjusting the height of key 1.

[0020] Specifically, the connecting body 4 can be a connecting bolt, which can be connected to the keyboard center plate 2 by an embedded fitting method in a mounting groove that matches the shape and size of the connecting bolt, or by gluing the connecting bolt to the keyboard center plate 2. The operating part 6 can be a hexagonal bolt head fixed to the top of the pin body 3, or a hexagonal countersunk groove opened at the top of the pin body 3, which allows the pin body 3 to be rotated by using an external hex wrench or an internal hex wrench.

[0021] Reference Figure 3 To improve the stability of the pin body 3 when connected to the connecting part and prevent the pin body 3 from rotating on its own, in this embodiment, the pin body 3 can be damped and connected to the connecting bolt, thereby limiting the pin body 3 from rotating on its own after rotation. Specifically, the connecting bolt can be composed of a bolt housing 41 and a connecting sleeve 42. The connecting sleeve 42 is coaxially inserted in the bolt housing 41, and the bottom end of the pin body 3 is in interference thread fit with the connecting sleeve 42, so that the pin body 3 can stop rotating at any time when tightening / loosening in the connecting sleeve 42. The connecting sleeve 42 can be made of nylon, so that when the connecting sleeve 42 and the pin body 3 are in interference thread fit, the external thread on the surface of the pin body 3 can be kept intact.

[0022] Furthermore, the support portion 5 on the pin body 3 includes a support pad 51, the upper surface of which is spherical, and the upper surface of the support pad 51 slides in contact with the bottom surface of the key 1. Compared with the traditional planar support structure, when the key 1 swings up and down above the support portion 5 with the top wall being flat, the key 1 will move from a state of rotating with one edge of the support portion 5 as the fulcrum to a state of fitting against the screen on the support portion 5, and then continue to rotate with the other edge of the support portion 5 as the fulcrum. During the switching process of rotating with the two edges of the support portion 5 as the fulcrum, the piano user can feel a slight tactile feedback from the key 1 during the key press, accompanied by abnormal noise from the two ends of the support plate 52, which affects the smooth pressing of the piano key 1 and the accurate performance of the piano user. Therefore, this application uses a support pad 51 with a spherical top surface. The piano key 1 swings on the support pad 51. The piano key 1 always maintains smooth contact with the surface of the support pad 51. The support point of the piano key 1 on the support pad 51 will not change abruptly, so that the piano key 1 has a smooth touch during the pressing process, which can effectively avoid the noise generated during the pressing of the piano key 1.

[0023] Furthermore, the support part 5 also includes a support plate 52, which is integrally fixed with the pin body 3. The support pad 51 is sleeved on the pin body 3 and located above the support plate 52, so that the support pad 51 and the pin body 3 are detachable. When the piano is used continuously and the support pad 51 is worn, the key feel of the piano key 1 can be restored by replacing the support pad 51.

[0024] Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if these modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and modifications.

Claims

1. A height-adjustable balance pin for a piano key (1), characterized in that: The keyboard includes a pin body (3) and a connector (4). The connector (4) is located inside the keyboard center section (2). The bottom of the pin body (3) is threadedly connected to the connector (4) in the keyboard center section (2). The pin body (3) passes through the key (1). A support part (5) is fixedly connected to the pin body (3). The bottom surface of the key (1) is in contact with the support part (5). The key (1) has a movable hole for rotating relative to the pin body (3) with the support part (5) as the fulcrum. The top of the pin body (3) is provided with an operating part (6) for operating the pin body (3) to rotate.

2. The adjustable height balance pin of the piano key (1) according to claim 1, characterized in that, The connector (4) includes a connecting bolt, which is fixedly installed in the middle section (2) of the keyboard, and the bottom end of the pin body (3) is threadedly connected to the connecting bolt. The operating part (6) includes a hexagonal bolt head, which is coaxially fixedly connected to the top of the pin body (3).

3. The adjustable height balance pin of the piano key (1) according to claim 2, characterized in that, The pin body (3) is connected to the connecting bolt with a damped thread.

4. The adjustable height balance pin of the piano key (1) according to claim 3, characterized in that, The connecting bolt includes a bolt housing (41) and a connecting sleeve (42). The connecting sleeve (42) is coaxially fixed inside the bolt housing (41). The connecting sleeve (42) is made of nylon. A threaded hole is coaxially opened on the connecting sleeve (42). The bottom end of the pin body (3) is interference-fitted with the connecting sleeve (42).

5. The adjustable height balance pin for the piano key (1) according to any one of claims 1-4, characterized in that, The support part (5) includes a support pad (51), the upper surface of which is spherical, and the upper surface of which slides in contact with the bottom surface of the piano key (1).

6. The adjustable height balance pin for the piano key (1) according to claim 5, characterized in that, The support part (5) includes a support piece (52), which is fixedly connected to the pin body (3), and the support pad (51) is sleeved on the pin body (3) and located above the support piece (52).

Images