Vertical banjo tuning knob angle limiter

Abstract

The utility model discloses a vertical banjo tuning knob angle stopper relates to musical instrument accessory technical field, aims at solving the problem of traditional tuning knob's complicated operation, insufficient precision in overtones variation etc. The device adopts modular design, contains knob fixed part and angle limiting part: knob fixed part is through the knob fixed hole and radial step of fixed base adaptation lute knob, utilizes the set screw and realizes the nondestructive installation, and the angle limiting part is by the limiting frame, rotatable first limiting ring and second limiting ring of cover and is constituted, and the two ring inner wall is equipped with the limiting convex point, and the outer wall is gear -like adjustment step, and is fixed through hand screw radial compression, and is combined with the thinning inner hole of limiting shaft sleeve and the outside bulge, realizes the mechanical rigidity constraint of knob rotation angle. The utility model is compatible with existing knob structure, need not to transform, and improves assembly precision through positioning step and gap design, supports two -way limit definition, gear -like step and parameter optimization provide efficient tactile feedback, the utility model significantly simplifies tuning operation, is applicable to the professional performance scene of quick interval switching, has low cost, high compatibility and long -term stability advantage.

Description

Technical Field

[0001] This utility model relates to the field of musical instrument accessories, specifically a vertical banjo tuning knob angle limiter. Background Technology

[0002] In the field of guitar playing and tuning, existing tuning devices are mainly used to calibrate the pitch of the strings to the standard pitch. In normal playing scenarios, once tuning is completed, traditional tuning knobs usually do not need to be operated frequently. However, when it comes to special playing effects, existing technology has obvious shortcomings.

[0003] Taking the altered pitch performance after natural harmonics as an example, currently, the only way to achieve altered pitch is by adjusting the string tension through the tuning knob. This process is not only inconvenient to operate, but also requires a high level of pitch judgment from the performer. Many performers lack the ability of absolute pitch and find it difficult to complete such tuning operations quickly and accurately, which in turn affects the performance effect to a certain extent.

[0004] Currently, there are no products or solutions on the market that can effectively solve the above problems. The limiter involved in this utility model has outstanding technical advantages. The limiter is designed to be attached to the existing vertical banjo tuning knob, which is a typical modular design. It makes full use of the existing finished banjo tuning knobs without redesigning and producing new tuning knob components. This design avoids resource redundancy and design waste in the production process. It can be manufactured based on the existing banjo tuning knobs, reducing production costs, and can also add new practical functions for users. Without changing the original hardware, it cleverly meets the tuning needs of special performance scenarios and effectively fills the technical gap in this field. Utility Model Content

[0005] The purpose of this invention is to provide a vertical Banjo tuning knob angle limiter to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A vertical Banjo tuning knob angle limiter includes a knob fixing part, comprising a fixing base with a knob fixing hole and a radial step on its inner wall; two threaded through holes with axes parallel to the knob fixing hole, provided on the fixing base; a set screw through hole and a matching set screw, provided on the side of the fixing base; and a connecting gasket with two connecting holes coaxial with the threaded through holes and a central through hole coaxial with the knob fixing hole.

[0008] The angle limiting part includes a limiting frame with two side threaded holes at an angle to each other in the horizontal direction; two connecting through holes coaxial with the threaded through holes; a first limiting ring and a second limiting ring, which are rotatably sleeved on the limiting frame. Each limiting ring has a first limiting protrusion and a second limiting protrusion on its inner wall, and a gear-shaped first manual adjustment step and a second manual adjustment step on its outer wall; a hand-tightening screw that engages with the side threaded holes, with its end abutting against the outer wall of the first and second limiting rings; a limiting bushing with a symmetrically thinned cylindrical structure in its inner hole and a limiting protrusion on its outer side; and a fixed base that is fixed by connecting bolts that pass through the connecting through holes and connecting holes in sequence.

[0009] Furthermore, each connecting hole of the connecting gasket is provided with an axially protruding positioning step on its outer periphery, the step height being 0.5-2mm, which forms an axial positioning fit with the fixed base and the limiting frame.

[0010] Furthermore, the hand-tightening screw presses and fixes the first and second limiting rings to the limiting frame by radial pressure.

[0011] Furthermore, the limiting protrusion of the limiting bushing is constrained within the angle range formed by the first limiting protrusion and the second limiting protrusion of the adjacent limiting ring.

[0012] Furthermore, the included angle of the axis of the side threaded hole in the horizontal direction is 25-90°, and the difference in vertical distance between the axes of the two holes is 2-4mm.

[0013] Furthermore, the first and second manual adjustment steps have 8-24 teeth, the tooth tip circle diameter is 0.3-2mm larger than the outer diameter of the limiting frame, and the thickness is 0.5-2mm.

[0014] Furthermore, the gap between the limiting protrusion of the limiting bushing and the inner wall of the first limiting ring and the second limiting ring is 0.1-2.5mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model, through modular and compatible design, breaks through the technical limitations of traditional solutions that require the complete replacement of tuning knobs or modification of the instrument body. It adopts a collaborative structure of detachable fixed base and limiting components to achieve seamless adaptation with existing banjo tuning knobs, significantly reducing the complexity of modification and maintenance costs, while avoiding the waste of resources in the original structure of the instrument.

[0017] 2. This utility model, through precise limiting and rapid adjustment design, replaces manual experience judgment with mechanical rigid constraints, and combines angle range locking and tactile feedback mechanism to effectively solve the core problems of poor pitch consistency and long adjustment time in traditional tuning operations. It is especially suitable for professional performance scenarios that require rapid pitch change. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention from another perspective;

[0020] Figure 3 This is a top view of the present invention;

[0021] Figure 4 This is an exploded view of the present invention;

[0022] Figure 5 A schematic diagram of the structure of an existing finished vertical Banjo tuning knob;

[0023] Figure 6 This is a schematic diagram of the structure of this utility model assembled on the tuning knob;

[0024] In the picture:

[0025] 1. Fixed base; 101. Knob fixing hole; 102. Radial step; 103. Set screw through hole; 104. Threaded through hole; 105. Connecting bolt; 106. Set screw; 2. Connecting washer; 201. Connecting hole; 202. Center through hole; 203. Positioning step; 3. Limiting frame; 301. Side threaded hole; 302. Connecting through hole; 4. First limiting ring; 401. First limiting protrusion; 402. First manual adjustment step; 5. Second limiting ring; 501. Second limiting protrusion; 502. Second manual adjustment step; 6. Tightening screw; 7. Limiting bushing; 701. Inner hole; 702. Limiting protrusion; 8. Tuning knob; 801. Knob base; 802. Knob handle column. Detailed Implementation

[0026] The embodiments and accompanying drawings are described in detail below. It should be noted that those skilled in the art can implement the technical solution within the scope of the claims by equivalent substitution or parameter adjustment. The embodiments and drawings in the specification are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0027] like Figure 1-6As shown, this utility model provides a vertical banjo tuning knob angle limiter, the limiter includes a knob fixing part and an angle limiting part; the fixing base (1) of the knob fixing part is provided with a knob fixing hole (101) in the center, and the inner wall of the knob fixing hole (101) is provided with a radial step (102) to adapt to the installation interface of the body knob; the fixing base (1) is provided with a set screw through hole (103) on the side, and the set screw (106) is used to achieve quick locking and fixing with the body; the fixing base (1) is also provided with two threaded through holes (104) with the axis parallel to the knob fixing hole (101) for connecting the angle limiting part. The connecting gasket (2) is coaxially aligned with the threaded through hole (104) through two connecting holes (201), and its central through hole (202) is coaxially connected with the knob fixing hole (101) to ensure the through installation of the knob handle column; the connecting hole (201) of the connecting gasket (2) is provided with an axially protruding positioning step (203) on the outer periphery, the step height is 0.5-2mm, which is used to form an axial positioning fit with the fixed base (1) and the limiting frame (3) to improve the assembly accuracy.

[0028] The limiting frame (3) of the angle limiting part has side threaded holes (301) on both sides with an included angle of 25-90° and a vertical distance difference of 2-4mm between the two hole axes. It is coaxially aligned with the threaded through hole (104) of the fixed base (1) through two connecting through holes (302) and rigidly connected by connecting bolts (105). The first limiting ring (4) and the second limiting ring (5) are rotatably sleeved on the upper and lower sides of the limiting frame (3). The inner walls of the two limiting rings are respectively provided with a first limiting protrusion (401) and a second limiting protrusion (501). The outer wall is provided with a gear-shaped first manual adjustment step (402) and a second manual adjustment step (502), with 8-24 teeth. The tooth tip circle diameter exceeds the outer diameter of the limit frame (3) by 0.3-2mm, and the thickness is 0.5-2mm. The tooth-shaped protrusion provides the operating force point. After the hand screws (6) on both sides of the limit frame (3) are screwed into the side threaded holes (301), their ends abut against the outer wall of the limit ring. The first limit ring (4) and the second limit ring (5) are pressed and fixed to the inner wall of the limit frame (3) by radial pressure to form friction lock.

[0029] The limiting bushing (7) is fitted onto the knob handle post (802). Its inner hole (701) adopts a symmetrically thinned cylindrical structure, which can adapt to the tolerance of posts of different diameters and ensure synchronous rotation. The limiting protrusion (702) on the outside of the limiting bushing (7) extends into the limiting frame (3). Its range of motion is constrained within the angle range formed by the limiting protrusions (401 / 501) of the two limiting rings. The gap between the limiting protrusion (702) and the inner wall of the limiting ring is 0.1-2.5mm, which takes into account both rotation flexibility and limiting accuracy.

[0030] The working principle of this utility model is as follows: During installation, the limiter is directly sleeved on the knob base (801) installed on the piano body as an integral module and locked and fixed by the side set screw (106). The limit bushing (7) is sleeved into the knob handle column (802). Its inner hole (701) is adapted to the diameter of the knob handle column (802) of different brands of knobs through symmetrical thinning design to ensure synchronous rotation with it. The first limit ring (4) and the second limit ring (5) are respectively installed on the upper and lower ends of the limit frame (3). The first limit protrusion (401) and the second limit protrusion (501) on the inner wall of the two rings cooperate with the limit protrusion (702) on the outer side of the limit bushing (7). When tuning, if the first limiting ring (4) is defined as a counterclockwise limiting ring, then rotate the handle column (802) to the first target pitch angle position and then move its first manual adjustment step (402) so that the first limiting protrusion (401) abuts against the left edge of the limiting protrusion (702) and the corresponding hand screw (6) is tightened; continue to rotate to the second target pitch angle position and then move the second manual adjustment step (502) of the second limiting ring (5) so that the second limiting protrusion (501) contacts the right edge of the limiting protrusion (702) and the corresponding hand screw (6) is tightened.

[0031] If the limiting direction needs to be defined in the opposite direction, the rotation direction of the two limiting rings can be reversed: to define the second limiting ring (5) as counterclockwise limiting, rotate the handle column (802) to the first target pitch angle position and then move its second manual adjustment step (502) so that the second limiting protrusion (501) abuts against the left edge of the limiting protrusion (702) and the corresponding hand screw (6) is tightened; continue to rotate to the second target pitch angle position and then move the first manual adjustment step (402) of the first limiting ring (4) so ​​that its first limiting protrusion (401) contacts the limiting protrusion. The right edge of the protrusion (702) is locked with the corresponding hand screw (6); the hand screw (6) forces the outer wall of the first limiting ring (4) and the outer wall of the second limiting ring (5) to rub against the inner wall of the limiting frame (3) through radial pressure. The hard contact between the limiting protrusion (702) and the first limiting protrusion (401) and the second limiting protrusion (501) controls the rotation angle error within ±1°. The user can adjust the thinning amount of the inner hole (701) of the limiting bushing to adapt to non-standard columns, or replace the gear-shaped step with other protrusion structures that are easy to move.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any skilled worker in the industry can implement this utility model according to the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, based on the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A vertical banjo tuning knob angle limiter, characterized in that, The device includes a knob fixing part, comprising a fixing base (1) with a knob fixing hole (101) and a radial step (102) on its inner wall; two threaded through holes (104) with axes parallel to the knob fixing hole (101) on the fixing base (1); a set screw through hole (103) and a matching set screw (106) on the side of the fixing base (1); and a connecting washer (2) with two connecting holes (201) coaxial with the threaded through holes (104) and a central through hole (202) coaxial with the knob fixing hole (101). The angle limiting part includes a limiting frame (3), which has two side threaded holes (301) with the horizontal axis forming an angle; two connecting through holes (302) coaxial with the threaded through hole (104); a first limiting ring (4) and a second limiting ring (5), which can be rotatably sleeved on the limiting frame (3), each limiting ring having a first limiting protrusion (401) and a second limiting protrusion (501) on its inner wall, and a gear-shaped first manual adjustment step (402) and a second manual adjustment step (502) on its outer wall; a hand screw (6) that engages with the side threaded hole (301), with its end abutting against the outer wall of the first limiting ring (4) and the second limiting ring (5); a limiting bushing (7), whose inner hole (701) is a symmetrically thinned cylindrical structure, and a limiting protrusion (702) on its outer side; the fixed base (1) is fixed by connecting bolts (105) passing through the connecting through hole (302) and the connecting hole (201) in sequence.

2. The limiter as described in claim 1, characterized in that, Each connecting hole (201) of the connecting gasket (2) is provided with an axially protruding positioning step (203) on its outer periphery. The step height is 0.5-2mm, which forms an axial positioning fit with the fixed base (1) and the limiting frame (3).

3. The limiter as described in claim 1, characterized in that, The hand-tightening screw (6) presses and fixes the first limiting ring (4) and the second limiting ring (5) to the limiting frame (3) by radial pressure.

4. The limiter as described in claim 1, characterized in that, The limiting protrusion (702) of the limiting bushing (7) is constrained within the included angle range formed by the first limiting protrusion (401) and the second limiting protrusion (501) of the adjacent limiting ring.

5. The limiter as described in claim 1, characterized in that, The horizontal angle between the axes of the side threaded holes (301) is 25-90°, and the vertical distance difference between the axes of the two holes is 2-4mm.

6. The limiter as described in claim 1, characterized in that, The gear-shaped first manual adjustment step (402) and the second manual adjustment step (502) have 8-24 teeth, the tooth tip circle diameter is 0.3-2mm larger than the outer diameter of the limiting frame (3), and the thickness is 0.5-2mm.

7. The limiter as described in claim 1, characterized in that, The gap between the limiting protrusion (702) of the limiting bushing (7) and the inner wall of the first limiting ring (4) and the second limiting ring (5) is 0.1-2.5mm.

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