Bass musical instrument button anti-runaway string locking device

Abstract

The invention provides a Bass musical instrument button run-out-proof string locking device, which comprises a shell with a groove, and a cylinder I and a cylinder II which are arranged on the shell, and is characterized in that a notch is formed in the middle of the cylinder I, a rotating shaft is rotationally arranged in the cylinder I, a worm is arranged on the rotating shaft, and a nut is arranged on the worm. A string penetrating column is rotatably installed in the second cylinder, a worm gear is fixedly installed on the string penetrating column through a first bolt and located in a groove of the shell, the worm is connected with the worm gear in a meshed mode through a notch, a handle is fixedly connected to the rotating shaft through a second bolt, and a plurality of gaskets are installed between the handle and the first cylinder. A threaded hole is formed in the shell and communicates with the cavity of the first cylinder, and a fixing bolt for preventing the rotating shaft from rotating is installed in the threaded hole in a threaded connection mode. According to the invention, through the arrangement of the fixing bolts, the rotating shaft can be completely locked after tuning is completed, thereby fundamentally solving the problem that a conventional piano button is liable to run, and guaranteeing the pitch stability of the Bass in the playing process.

Description

Technical Field

[0001] This invention relates to the field of musical instrument adjustment technology, and in particular to a bass guitar tuning peg anti-tone locking device. Background Technology

[0002] Stringed instruments play an important role in musical performance, with the bass, as a low-pitched instrument, being widely used in various musical performances. The traditional bass tuning peg structure has obvious defects. Its string locking mechanism usually uses a simple screw-on method, which can easily cause the pegs to loosen due to vibration during instrument handling or vigorous playing, resulting in changes in string tension and causing the instrument to go out of tune.

[0003] Most existing piano tuning peg mechanisms lack reliable anti-loosening structures, relying solely on manual tightening by the operator to maintain tension. This not only increases the tuning frequency before playing but also severely affects the stability during performance. Especially in situations requiring frequent instrument movement, such as stage performances, traditional tuning peg structures struggle to maintain stable intonation over extended periods.

[0004] In addition, the adjustment components of existing piano tuning pegs are often exposed and easily changed position by external impacts. Furthermore, they lack an effective locking mechanism to fix the adjusted state. These problems force performers to frequently interrupt their performances to tune the piano, which seriously affects the performance effect and the viewing experience. Summary of the Invention

[0005] In view of this, embodiments of the present invention aim to provide a bass guitar knob anti-tune-locking string device to solve or alleviate the technical problems existing in the prior art.

[0006] The technical solution of this invention is implemented as follows: A bass guitar anti-tune-locking string device includes a shell with a groove, and a first cylinder and a second cylinder mounted on the shell. The first cylinder has a notch in the middle, and a rotating shaft is rotatably installed inside the first cylinder. A worm gear is installed on the rotating shaft. A string-passing post is rotatably installed inside the second cylinder. A worm wheel is fixedly installed on the string-passing post by a bolt. The worm wheel is located in the groove of the shell. The worm gear is meshed with the worm wheel through the notch. A handle is fixedly connected to the rotating shaft by a bolt. Multiple washers are installed between the handle and the first cylinder. The shell has a threaded hole that communicates with the cavity of the first cylinder. A fixing bolt to prevent the rotating shaft from rotating is installed in the threaded hole by a threaded connection.

[0007] By turning the handle, the shaft rotates synchronously, and the worm gear on the shaft rotates accordingly. Because the worm gear and worm wheel mesh through a notch, the worm gear drives the worm wheel and the string post fixed to it to rotate, thereby achieving the winding and tensioning of the strings on the string post, completing the pitch adjustment. After adjustment, tighten the fixing bolt in the threaded hole so that the top of the fixing bolt presses against the shaft, which can firmly lock the position of the shaft, effectively preventing the shaft from loosening due to vibration, accidental bumps, or long-term use during bass playing, thus avoiding out-of-tune phenomena from the root and ensuring that the pitch is always stable.

[0008] To facilitate the secure installation of the entire device onto the bass headstock, an extension plate is installed on the outer shell. The extension plate has a mounting through hole. By passing a fixing bolt through the through hole and threading it into the pre-set mounting hole on the headstock, the entire string locking device can be stably fixed in the designated position on the headstock, preventing the device from shifting during use.

[0009] To facilitate the adaptation and connection of the string post with the original tuning peg structure of the bass, or to directly replace it, the second cylinder is provided with threads. The threaded connection enables quick docking of the string post with the tuning peg installation structure inside the headstock, and the connection is strong and stable, making disassembly and maintenance more convenient in the future.

[0010] To achieve effective winding and secure clamping of the strings and prevent them from slipping, the string-passing post consists of three cylinders of different diameters. One end of each string-passing post is a concave arc shape, and a notch for placing the string is provided at the end of the concave arc shape. In use, one end of the string is inserted into the notch and fixed. By rotating the string-passing post, the string can be tightly wound around the cylindrical segments of different diameters. This increases the contact area between the string and the string-passing post and optimizes the string tension distribution through the diameter difference, further reducing the risk of slippage.

[0011] To ensure the stability of the connections between the components, while also taking into account the rationality and compactness of the structural assembly, the length of bolt one is greater than the length of bolt two; the longer bolt one can pass through the through-string column and the worm gear for deep penetration and fixation, ensuring that there is no relative displacement when the worm gear and the through-string column rotate synchronously; the shorter bolt two is only used to fix the handle to the end of the rotating shaft, which satisfies the fixation requirements while avoiding structural redundancy caused by excessively long bolts, making the overall device more compact.

[0012] To simplify the manufacturing process of the device, enhance the overall structural strength, and reduce assembly risks, the outer shell is integrated with cylinder one and cylinder two. The integrated structure eliminates the assembly steps of multiple components, avoids the stress concentration problems that may occur due to welding or bolting connections in traditional split structures, reduces the risk of component loosening during long-term use, and extends the service life of the device.

[0013] To prevent the handle from loosening due to bass vibration during use and to ensure the stability of the worm gear transmission, at least one of the plurality of washers is a spring washer. The spring washer provides a continuous elastic preload, ensuring that the connection between the bolt and the handle and the shaft remains tight even under long-term vibration, thus avoiding transmission deviation caused by the handle loosening.

[0014] To optimize the layout of the device on the headstock, improve the ergonomics of operation, and avoid interference between adjustment and string changing, the first cylinder is located on one side of the outer shell, and the second cylinder is located at the bottom of the outer shell. This layout places the handle (adjustment component) and the string post (string winding component) in different positions, so that the player will not touch the strings when adjusting the pitch, and there is no need to disassemble the adjustment component when changing the strings, making the operation more convenient.

[0015] Furthermore, a circular outer shell can be provided on the outer shell, and the outer shell and the outer shell are integrally set, with the worm gear being enclosed in the groove by a cover plate; the integrated outer shell can protect the internal transmission components such as the worm and worm wheel, preventing dust and impurities from entering and affecting the transmission accuracy, while also improving the overall aesthetics of the device.

[0016] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: This invention adjusts the string tension through worm gear meshing transmission. The worm gear has a large transmission ratio, which can achieve fine-tuning of pitch and meet the high precision requirements of the performer for pitch accuracy. This invention, by setting a fixing bolt, can completely lock the pivot after tuning, fundamentally solving the problem of traditional bass keys going out of tune due to vibration and wear, and ensuring the pitch stability of the bass during long-term playing and transportation. The present invention adopts an integrated shell design, which enhances the overall rigidity of the device. Combined with the anti-loosening structure of spring pads and multiple gaskets, it ensures reliable connection of each component and reduces the risk of failure. The invention has a reasonable overall structure and layout, simple operation steps, and convenient installation and maintenance. It can be adapted to various types of bass instruments such as electric bass and acoustic bass, has a wide range of applications, and has high practical value and market promotion potential.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 for Figure 1 A schematic diagram of the structure unfolded.

[0020] Figure label: 1. Outer shell; 2. Cylinder 1; 3. Cylinder 2; 4. Notch; 5. Shaft; 6. Worm; 7. Through string post; 8. Bolt 1; 9. Worm gear; 10. Bolt 2; 11. Handle; 12. Washer; 13. Fixing bolt; 14. Notch; 15. Extension plate; 16. Through hole. Detailed Implementation

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] like Figure 1-2 As shown in the accompanying drawings, the technical solutions of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In existing technology, bass tuning pegs mostly use simple gear transmission or friction braking structures, lacking a reliable mechanical self-locking mechanism. When a bass is subjected to impacts during transportation, generates high-frequency vibrations during playing, or experiences wear and tear on components after long-term use, the tuning pegs are prone to accidental rotation, leading to abnormal changes in string tension and a significant decrease in intonation stability. This situation forces users to frequently interrupt playing for retuning, affecting not only the continuity of performance but also reducing the overall user experience, especially failing to meet the high-precision intonation requirements of professional performers.

[0024] To address the aforementioned issues, designers discovered through analysis that the core reason for the bass tuning pegs going out of tune was the lack of a self-locking function to resist external interference. Through research into the characteristics of the transmission mechanism, they recognized that the worm gear 9 and worm 6 structure possess a unidirectional transmission physical self-locking characteristic—the worm gear 9 can only be driven to rotate via the worm 6; conversely, the worm gear 9 cannot drive the worm 6 to rotate in the opposite direction. This characteristic fundamentally prevents accidental tuning peg rotation caused by external forces. Based on this, the designers attempted to integrate the worm gear 9 and worm 6 mechanism into the tuning peg adjustment system, along with a manual adjustment component and an auxiliary locking structure, forming an integrated "adjustment-self-locking-reinforcement" tuning peg locking solution to balance pitch adjustment accuracy and long-term stability.

[0025] Therefore, this solution proposes a bass guitar tuning peg anti-tune locking device. This device includes a grooved outer shell 1 (base), which serves as the core load-bearing component. The outer shell 1 can be made of cast aluminum alloy or injection molded from reinforced nylon. Its groove provides an installation reference for the worm gear 9, and is specifically machined using CNC milling. A cylindrical first cylinder 2 is located on the side of the outer shell 1, and a cylindrical second cylinder 3 is located at the bottom. The cylindrical first cylinder 2 is a hollow tubular structure that accommodates the rotating shaft 5 and the worm gear 6. It is specifically machined from stainless steel, with an inner diameter matching the diameter of the rotating shaft 5. A notch 4 is opened in the middle for the worm gear 6 to mesh with the worm gear 9. The notch 4 is specifically formed using laser cutting, with the opening size matching the tip circle diameter of the worm gear 6 teeth. The cylindrical second cylinder 3 is a hollow structure that accommodates the string post 7 and the worm gear 9. It is specifically machined from the same material as the cylindrical first cylinder 2 to ensure smooth rotation of the string post 7.

[0026] Inside cylinder 2, a rotating shaft 5 with a worm gear 6 is integrally machined with the shaft 5. The tooth surface of the worm gear 6 is hardened by carburizing and quenching. This design enables unidirectional transmission and self-locking, preventing the worm wheel 9 from driving the worm gear 6 in the opposite direction. The end of the shaft 5 is fixedly connected to the handle 11 by bolt 2 10, ensuring that the torque can be effectively transmitted to the shaft 5 during manual adjustment and preventing relative slippage between the two. Three to five washers 12 are set between the handle 11 and cylinder 2. The washers 12 are specifically a combination of stainless steel flat washers and at least one disc spring washer. Their elastic deformation provides continuous axial preload, counteracting the loosening tendency caused by bass vibration. The outer shell 1 also has a threaded hole communicating with the cavity of cylinder 2. A fixing bolt 13 for limiting the rotation of the shaft 5 is installed inside. After tightening, the top can directly abut against the outer surface of the shaft 5, forming a physical lock. This, together with the self-locking characteristics of the worm wheel 9 and worm gear 6, constitutes a double locking mechanism.

[0027] To achieve a stable connection between the device and the bass headstock, this solution further proposes to install an extension plate 15 on the outer shell 1. The extension plate 15 is a plate-like structure that extends horizontally from the side of the outer shell 1 and is fixed to the outer shell 1 by argon arc welding to ensure sufficient installation support area. The extension plate 15 has 2-3 through holes 16, which are processed by CNC drilling. The hole spacing is designed according to the common mounting hole positions of bass heads. In use, the countersunk bolts are passed through the through holes 16 and matched with the pre-set threaded holes of the headstock to form multi-point fixation and prevent the device from shifting under stress.

[0028] To accommodate the tuning peg mounting structures of different bass headstocks, this solution proposes that cylinder 2 3 be threaded. This thread refers to a spiral groove structure machined on the outer surface of cylinder 2 3. Through the threaded connection, the string post 7 can be quickly connected to the tuning peg mounting structure inside the headstock. Compared with traditional interference fit or glued fixing, the connection is not only more stable, but also easy to disassemble and maintain later by simply rotating cylinder 2 3, greatly improving the convenience of operation.

[0029] To prevent the strings from sliding on the string post 7 and ensure stable tension, this design proposes that the string post 7 be composed of three cylinders with different diameters. The difference in diameter optimizes the tension distribution when the strings are wound. One end of the string post 7 is a concave arc shape, which is formed by CNC turning and fits the outer surface of the strings. This can disperse the local stress when the strings are in contact with the pegs and prevent the strings from breaking due to stress concentration. The end of the string post 7 with the concave arc shape has a notch 14 for placing the strings. The notch 14 is processed by wire cutting. After the strings are inserted into the notch 14, the groove wall can physically limit the strings and prevent the strings from falling out of the predetermined winding position when tuning or vibrating.

[0030] To adapt to the stress requirements of different components and ensure connection reliability, this solution proposes that the length of bolt 8 be greater than the length of bolt 10. Bolt 8 is a fastener used to fix the worm gear 9 and the through-string post 7. The longer threaded engagement section can improve the shear resistance of the worm gear 9 when subjected to rotational torque and avoid relative displacement between the worm gear 9 and the through-string post 7 during transmission. Bolt 10 is a fastener used to fix the handle 11 and the rotating shaft 5. The shorter length can prevent the bolt end from extending into the cylinder 2 and interfering with the worm 6 or the inner wall of the cylinder. While meeting the fixing requirements, it ensures smooth rotation of the rotating shaft 5.

[0031] To enhance the overall rigidity of the device and reduce assembly risks, this solution proposes that the outer shell 1 be integrated with cylinder 1 2 and cylinder 2 3. This integrated design means that the three components are processed into a single structure through an integral molding process. The integrated structure completely eliminates the assembly gaps caused by welding or bolting in traditional split structures, and avoids loosening of components due to vibration during long-term use.

[0032] To protect the internal transmission components and enhance the aesthetics of the device, this solution further proposes that a circular outer shell can be installed on the outer shell 1, and the outer shell and the outer shell 1 are integrally set. The outer shell is made of the same material as the outer shell 1, and is formed simultaneously with the outer shell 1 through casting or injection molding processes; the outer surface of the outer shell can be anodized (for metal materials) or sprayed with oil (for plastic materials) to improve surface wear resistance and visual effect, making the device more harmonious with the appearance of the bass headstock.

[0033] Specifically, when adjusting the bass pitch, the operator rotates handle 11. Handle 11, via bolt 2 10, drives the shaft 5 to rotate synchronously, and the worm gear 6 on the shaft 5 rotates accordingly. At this time, one end of the string is inserted into the notch 14 at the end of the string post 7. The three cylindrical sections of the string post 7 with different diameters allow the string to be tightly wound, and the concave arc-shaped end disperses the string stress, preventing the string from slipping or breaking, thus achieving fine adjustment of the string tension. After the pitch adjustment is completed, tighten the fixing bolt 13 in the threaded hole of the outer casing 1, so that the top of the fixing bolt 13 presses against the outer surface of the shaft 5, completely locking the position of the shaft 5. This forms a double locking mechanism of "worm gear 9 self-locking + fixing bolt 13 physical locking," ensuring that the shaft 5 will not rotate unexpectedly even if the bass is subjected to strong vibration or accidental impact.

[0034] During installation, the device is fixed to the preset position of the bass headstock using countersunk bolts through the mounting through holes 16 on the extension plate 15. The multi-point fixing structure can distribute the torsional stress during operation and prevent overall displacement of the device. The threads on the outer surface of cylinder 2 3 can be quickly connected to the tuning pin mounting structure inside the headstock, adapting to different models of bass instruments. During long-term use, the spring pad between the handle 11 and cylinder 1 2 provides continuous elastic preload, preventing bolt 2 10 from loosening due to vibration and ensuring that the connection between the handle 11 and the pivot 5 remains tight. The integrated housing 1, cylinder 1 2, and cylinder 2 3 provide stable support for the transmission components, preventing meshing deviation of the worm gear 6 and worm wheel 9 due to structural deformation.

[0035] Compared to existing technologies, traditional bass tuning pegs lack mechanical self-locking and rely solely on friction braking, making them prone to loosening under external force. The separate outer shell 1 and cylinder are connected by bolts, creating assembly gaps that can lead to component misalignment after prolonged vibration. The uniform bolt specifications cannot accommodate the different needs of the worm gear 9-string post 7 (high stress) and the handle 11-shaft 5 (low stress), easily causing localized stress concentration. The concentrated layout of transmission and adjustment components makes it easy to touch the strings when adjusting pitch, and requires disassembling the adjustment components when changing strings, resulting in cumbersome operation. This solution solves the problem of tuning pegs going out of tune by utilizing the unidirectional self-locking characteristic of the worm gear 9 and worm 6, along with the physical locking of the fixing bolt 13. The integrated structure enhances overall rigidity; the anti-loosening design of the spring pads ensures reliable component connections; the multi-point fixing of the extension plate 15 and the threaded adaptation of the cylinder 2 3 improve the installation compatibility of the device; the special structure of the string post 7 and the differentiated bolt length design optimize string fixing and component stress; and the circular outer shell protects the internal transmission components and extends the device's service life.

[0036] Through the above technical solutions, this solution effectively solves the problem of bass tuning pegs going out of tune due to accidental rotation. The worm gear 9 and worm 6 have a large transmission ratio, enabling high-precision fine-tuning of pitch to meet the intonation requirements of professional players. The dual locking mechanism ensures that the bass pitch remains stable during long-term playing, transportation, or storage. The integrated structure and spring pad design reduce the occurrence of component loosening failures. The overall structural layout is reasonable, and the adjustment of pitch will not touch the strings. Replacing strings does not require disassembling the adjustment components, making operation convenient. The threaded adapter of cylinder 2 3 and the multi-point fixing of extension plate 15 make the device compatible with various types of bass instruments such as electric bass and acoustic bass, with a wide range of applications.

[0037] The above description is merely an embodiment of this solution and is not intended to limit the scope of protection of this solution. Various modifications and variations can be made to this solution by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this solution should be included within the scope of protection of this solution.

Claims

1. A bass guitar tuning peg anti-tune-locking device, comprising a housing (1) with grooves, and a first cylinder (2) and a second cylinder (3) mounted on the housing (1), characterized in that, The cylinder 1 (2) has a notch (4) in the middle. A rotating shaft (5) is installed inside the cylinder 1 (2). A worm gear (6) is installed on the rotating shaft (5). A through-string column (7) is installed inside the cylinder 2 (3). A worm wheel (9) is fixedly installed on the through-string column (7) by bolt 1 (8). The worm wheel (9) is located in the groove of the outer shell (1). The worm gear (6) is meshed with the worm wheel (9) through the notch (4). A handle (11) is fixedly connected to the rotating shaft (5) by bolt 2 (10). Multiple washers (12) are installed between the handle (11) and the cylinder 1 (2). A threaded hole is opened on the outer shell (1) and communicates with the cavity of the cylinder 1 (2). A fixing bolt (13) to prevent the rotating shaft (5) from rotating is installed in the threaded hole by threaded connection.

2. The bass guitar tuning peg anti-tune locking device according to claim 2, characterized in that: The cylinder 2 (3) is provided with threads.

3. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: The string-passing post (7) is composed of three cylinders with different diameters. One end of the string-passing post (7) is a concave arc shape, and a notch (14) for placing the strings is opened on the string-passing post (7) with the concave arc shape.

4. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: The length of bolt one (8) is greater than the length of bolt two (10).

5. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: An extension plate (15) is installed on the outer shell (1), and the extension plate (15) has a through hole (16) for installation.

6. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: The outer shell (1) is integrally formed with cylinder one (2) and cylinder two (3).

7. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: At least one of the plurality of gaskets (12) is a spring gasket.

8. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: The first cylinder (2) is located on one side of the outer shell (1), and the second cylinder (3) is located at the bottom of the outer shell (1).

9. The bass guitar tuning peg anti-tune locking device according to claim 1, characterized in that: The worm gear (9) is enclosed in a groove by a cover plate.

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