Capo capable of accurately and conveniently adjusting clamping force
By using a combination of linear bearings and thread adjustment tie rods in the adjusting clamp, the existing adjusting clamping problem is solved, the accuracy and convenience of pitch adjustment are achieved, and the volume and appearance of the equipment are optimized.
Patent Information
- Application Number
- CN202410573337.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-05-13
AI Technical Summary
When clamping with existing variable adjusting clamps, the upper clamping force is greater than the lower clamping force, which affects the adjustment accuracy and is large in size, affecting aesthetics and comfort of use.
Through the linear bearing connection between the front clamping arm and the rear clamping arm, and the threaded adjustment of the tie rod and the spring, the translation of the adjusting inner sleeve is achieved, so that the upper and lower clamping forces are maintained consistently, ensuring the adjustment accuracy of the pitch. At the same time, the adjustment scale and indicators are designed for easy and quick adjustment.
It achieves consistency of clamping force, improves the accuracy and convenience of pitch adjustment, has a small size, beautiful appearance, and a wide range of application.
Smart Images
Figure CN119993094A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a guitar auxiliary tool, in particular to a capo with accurate and convenient clamping force adjustment. Background Art
[0002] The original purpose of the capo was to adjust the pitch of the guitar. It is a common auxiliary tool in folk guitar playing and singing. When changing the key, it can press the existing fret to raise the tune to a corresponding interval, so that it can be coordinated with the singer's voice. The original fingering method is used to play, which greatly reduces the difficulty of changing the key. It is widely used in the performance of flamenco guitar, classical guitar and folk guitar. When used for solo repertoire, the capo is often placed between the first and fourth frets, among which the second fret has the highest frequency, and the use above the fourth fret is basically only seen in accompaniment.
[0003] Existing capos are roughly divided into two categories, one is fixed clamping, and the other is slidable clamping. Existing fixed clamping capos have the following defects: 1. The top of the front clamping arm and the top of the rear clamping arm are hingedly connected by a rotating fulcrum. This structure makes the upper clamping force greater than the lower clamping force when clamping, affecting its adjustment accuracy; 2. The top of the front clamping arm and the top of the rear clamping arm are hingedly connected by a rotating fulcrum. This structure makes the upper clamping force greater than the lower clamping force when clamping, affecting its adjustment accuracy; 3. They are generally large in size, affecting their aesthetics and comfort of use. Summary of the invention
[0004] In order to solve the defects and shortcomings in the above-mentioned prior art, the present invention provides a front clamping arm and a rear clamping arm connected by a linear bearing composed of an adjusting inner sleeve, an adjusting limit sleeve and a ball, and the translation of the adjusting inner sleeve is achieved by tightening the threaded adjusting pull rod and resetting the spring, so that the upper and lower clamping forces of the front clamping arm and the rear clamping arm are kept consistent as much as possible, thereby ensuring the adjustment accuracy of the pitch. At the same time, an adjustment scale and an adjustment indicator mark matched with the adjustment scale are designed. The scale of the optimal pitch position can be adjusted after only one trial sound test. Each time it is used, it only needs to be adjusted to the specified scale (it can also be observed and recorded by adjusting the position of the indicator mark) and then clamped. The adjustment is very convenient, and it has high precision, small size, comfortable use, beautiful appearance, and a wide range of applications. The capo has accurate and convenient clamping force adjustment.
[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a capo with accurate and convenient clamping force adjustment, comprising a front clamping arm and a rear clamping arm that cooperate with each other, a clamping arm for clamping the two, a pull rod and a spring that cooperate with the clamping arm, the top of the front clamping arm is provided with an adjusting inner sleeve, the top of the rear clamping arm is provided with an adjusting limit sleeve that cooperates with the adjusting inner sleeve, the pull rod adopts a threaded adjusting pull rod, one end of the threaded adjusting pull rod is connected to the clamping arm, the spring is sleeved on the threaded adjusting pull rod, a spring retaining ring that cooperates with the spring is provided inside the adjusting inner sleeve, the other end of the threaded adjusting pull rod passes through the adjusting inner sleeve and the top of the front clamping arm and is connected to an adjusting knob, the adjusting inner sleeve is provided with an adjusting scale, and the outer side of the adjusting knob is provided with an adjusting indication mark that cooperates with the adjusting scale; a plurality of balls are provided between the adjusting inner sleeve and the adjusting limit sleeve, the balls, the adjusting inner sleeve and the adjusting limit sleeve constitute a linear bearing, and a plane bearing is provided between the adjusting knob and the front clamping arm.
[0006] The front clamping arm and the rear clamping arm of the present invention are connected by a linear bearing composed of an adjusting inner sleeve, an adjusting limit sleeve and a ball, and the translation of the adjusting inner sleeve is achieved by tightening the threaded adjusting pull rod and resetting the spring, so that the upper and lower clamping forces of the front clamping arm and the rear clamping arm are kept as consistent as possible, thereby ensuring the adjustment accuracy of the pitch. At the same time, an adjustment scale and an adjustment indicator mark matched with the adjustment scale are designed. The scale of the optimal pitch position can be adjusted with only one test. Each time it is used, it only needs to be adjusted to the specified scale (it can also be observed and recorded by adjusting the position of the indicator mark) and then clamped. The adjustment is very convenient, and it has high precision, small size, comfortable use, beautiful appearance and a wide range of applications.
[0007] Preferably, the adjustment knob comprises an integrally formed knob body and an internal threaded joint, the internal threaded joint is connected to a threaded adjustment rod, the plane bearing is located between the knob body and the front clamping arm, and the adjustment indication mark is arranged on the outside of the knob body.
[0008] This structure facilitates the assembly of the adjusting knob and the threaded adjusting rod, ensuring the stability and reliability of the adjustment.
[0009] Preferably, the threaded adjustment rod includes an integrally formed external thread section and a smooth rod section, the other end of the external thread section is connected to an internal thread joint, the other end of the smooth rod section is connected to a clamping arm, and a connecting short rod matching the clamping arm is provided at the end of the smooth rod section, and a rod groove matching the smooth rod section and a cam head matching the connecting short rod are provided at the top of the clamping arm.
[0010] This structure ensures the assembly reliability of the threaded adjustment rod and the clamping arm, thereby ensuring the stability and reliability of the clamping arm pulling the threaded adjustment rod.
[0011] Preferably, a circular recess matching the internal thread joint and an arc-shaped notch matching the knob body are provided on the outer side of the top of the front clamping arm, and the outer side surface of the knob body is flush with the outer side surface of the front clamping arm at the position of the arc-shaped notch.
[0012] This structure makes it possible to make the volume small and the appearance beautiful.
[0013] Preferably, the cross-section of the adjusting inner sleeve is square, and ball grooves for matching balls are provided on the outer sides of the four corners. The cross-section of the adjusting limit sleeve is also square, and ball grooves for matching balls are provided on the inner sides of the four corners, and an arc chamfer is provided at the end of the adjusting inner sleeve.
[0014] This structure facilitates the assembly of the ball bearings and ensures that the adjusting inner sleeve moves smoothly and reliably inside the adjusting limit sleeve.
[0015] Preferably, a gap is left between the minimum scale position on the adjustment scale and the fixed end of the adjustment inner sleeve to cooperate with the movement of the clamping arm, and the maximum scale position on the adjustment scale is located in the middle position of the adjustment inner sleeve. When the adjustment knob rotates one circle, the distance the adjustment inner sleeve moves is the distance between the maximum scale position and the minimum scale position.
[0016] This structure enables the clamping arm to have a certain clamping distance, thus ensuring the reliability of the clamping.
[0017] Preferably, a support block cooperating with the clamping arm is provided at the top of the rear clamping arm, and a cam groove cooperating with the clamping arm and a limit groove cooperating with the threaded adjustment rod are provided on the support block.
[0018] This structure further ensures the stability and reliability of the clamping arm pulling the threaded adjustment rod.
[0019] Preferably, a limiting end cover is provided at the end of the adjustment limit sleeve, and a clamping arm groove cooperating with the clamping arm is provided at the rear of the rear clamping arm. When the clamping arm is clamped, it is located in the clamping arm groove, and the outer side surface of the clamping arm is flush with the rear surface of the rear clamping arm.
[0020] This structure not only ensures good stability of the clamping arm when clamping, but also makes the entire product as small as possible while ensuring its aesthetics.
[0021] Preferably, the outer ring of the knob body is provided with anti-slip grooves, and the outer side surface of the knob body is provided with a decorative panel.
[0022] This structure further improves its adjustment stability and appearance aesthetics.
[0023] Preferably, a front rubber pad is provided on the inner side of the front clamping arm, a rear rubber pad is provided on the inner side of the rear clamping arm, the length of the front clamping arm is greater than the length of the rear clamping arm, part of the front rubber pad is embedded in the front clamping arm, and part of the rear rubber pad is embedded in the rear clamping arm.
[0024] This structure can well protect the guitar while ensuring the clamping stability.
[0025] The front clamping arm and the rear clamping arm of the present invention are connected by a linear bearing composed of an adjusting inner sleeve, an adjusting limit sleeve and a ball, and the translation of the adjusting inner sleeve is achieved by tightening the threaded adjusting pull rod and resetting the spring, so that the upper and lower clamping forces of the front clamping arm and the rear clamping arm are kept as consistent as possible, thereby ensuring the adjustment accuracy of the pitch. At the same time, an adjustment scale and an adjustment indicator mark matched with the adjustment scale are designed. The scale of the best pitch position can be adjusted with only one test sound. Each time it is used, it only needs to be adjusted to the specified scale (it can also be observed and recorded by adjusting the position of the indicator mark) and then clamped. The adjustment is very convenient, and the precision is high. The size is small. It is basically integrated with the guitar when used. It is comfortable to use, beautiful in appearance, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is an exploded schematic diagram of the present invention.
[0027] Figure 2 It is a structural schematic diagram of the present invention.
[0028] Figure 3 It is a structural schematic diagram of one angle of the adjustment knob in the present invention.
[0029] Figure 4 It is a structural schematic diagram of another angle of the adjustment knob in the present invention.
[0030] Figure 5 It is a structural schematic diagram of the threaded adjustment rod in the present invention.
[0031] Figure 6 It is a schematic diagram of the structure of the support block in the present invention.
[0032] Figure 7 It is a structural schematic diagram of one angle of the rear clamping arm in the present invention.
[0033] Figure 8 It is a schematic structural diagram of the rear clamping arm in another angle of the present invention.
[0034] Fig. 9 It is a structural schematic diagram of one angle of the front clamping arm in the present invention.
[0035] Fig.10It is a schematic structural diagram of the front clamping arm in the present invention at another angle.
[0036] In the figure: 1. front clamping arm, 2. rear clamping arm, 3. clamping arm, 4. spring, 5. adjusting inner sleeve, 6. adjusting limit sleeve, 7. threaded adjusting rod, 8. adjusting knob, 9. ball, 10. plane bearing, 11. knob body, 12. internal thread joint, 13. external thread section, 14. bare rod section, 15. connecting short rod, 16. circular concave, 17. arc notch, 18. ball groove, 19. Arc chamfer, 20. Ball groove, 21. Support block, 22. Limit end cover, 23. Pull rod groove, 24. Cam head, 25. Cam groove, 26. Limit groove, 27. Clamping arm groove, 28. Spring retaining ring, 29. Adjustment scale, 30. Adjustment indicator mark, 31. Minimum scale position, 32. Maximum scale position, 33. Decorative panel, 34. Anti-slip pattern, 35. Front rubber pad, 36. Rear rubber pad. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.
[0038] like Figure 1-10As shown, a capo with accurate and convenient clamping force adjustment comprises a front clamping arm 1 and a rear clamping arm 2 that cooperate with each other, a clamping arm 3 for clamping the two together, a pull rod and a spring 4 that cooperate with the clamping arm 3, an adjusting inner sleeve 5 is provided on the top of the front clamping arm 1, an adjusting limit sleeve 6 that cooperates with the adjusting inner sleeve 5 is provided on the top of the rear clamping arm 2, the pull rod adopts a threaded adjusting pull rod 7, one end of the threaded adjusting pull rod 7 is connected to the clamping arm 3, the spring 4 is sleeved on the threaded adjusting pull rod 7, and the inner part of the adjusting inner sleeve 5 is provided with a spring 4. There is a spring retaining ring 28 that matches the spring 4. The other end of the threaded adjustment rod 7 passes through the adjustment inner sleeve 5 and the top of the front clamping arm 1 and is connected to an adjustment knob 8. The adjustment inner sleeve 5 is provided with an adjustment scale 29, and the outer side of the adjustment knob 8 is provided with an adjustment indicator mark 30 that matches the adjustment scale 29; a plurality of balls 9 are provided between the adjustment inner sleeve 5 and the adjustment limit sleeve 6, and the balls 9, the adjustment inner sleeve 5 and the adjustment limit sleeve 6 constitute a linear bearing, and a plane bearing 10 is provided between the adjustment knob 8 and the front clamping arm 1. The adjustment knob 8 includes an integrally formed knob body 11 and an internal thread joint 12, the internal thread joint 12 is connected to the threaded adjustment rod 7, the plane bearing 10 is located between the knob body 11 and the front clamping arm 1, and the adjustment indicator mark 30 is provided on the outer side of the knob body 11. The threaded adjustment rod 7 includes an integrally formed external thread section 13 and a polished rod section 14. The other end of the external thread section 13 is connected to the internal thread joint 12. The other end of the polished rod section 14 is connected to the clamping arm 3. A connecting short rod 15 matching the clamping arm 3 is provided at the end of the polished rod section 14. A rod groove 23 matching the polished rod section 14 and a cam head 24 matching the connecting short rod 15 are provided at the top of the clamping arm 3. A circular concave 16 matching the internal thread joint 12 and an arc-shaped notch 17 matching the knob body 11 are provided on the outer side of the top of the front clamping arm 1. The outer side of the knob body 11 is flush with the outer side of the front clamping arm 1 at the position of the arc-shaped notch 17. The cross section of the adjusting inner sleeve 5 is square, and ball grooves 18 matching the ball 9 are provided on the outer sides of the four corners. The cross section of the adjusting limit sleeve 6 is also square, and ball grooves 20 matching the ball 9 are provided on the inner sides of the four corners, and an arc-shaped chamfer 19 is provided at the end of the adjusting inner sleeve 5. There is a gap between the minimum scale position 31 on the adjustment scale 29 and the fixed end of the adjustment inner sleeve 5 to match the movement of the clamping arm 3. The maximum scale position 32 on the adjustment scale 29 is located in the middle of the adjustment inner sleeve 5. When the adjustment knob 8 rotates one circle, the distance that the adjustment inner sleeve 5 moves is the distance between the maximum scale position 32 and the minimum scale position 31. The top of the rear clamping arm 2 is provided with a support block 21 to match the clamping arm 3. The support block 21 is provided with a cam groove 25 to match the clamping arm 3 and a limit groove 26 to match the threaded adjustment rod 7. The end of the adjustment limit sleeve 6 is provided with a limit end cover 22. The rear part of the rear clamping arm 2 is provided with a clamping arm groove 27 to match the clamping arm 3. When the clamping arm 3 is clamped, it is located in the clamping arm groove 27, and the outer side surface of the clamping arm 3 is flush with the rear surface of the rear clamping arm 2. The outer ring of the knob body 11 is provided with an anti-slip pattern 33, and the outer side surface of the knob body 11 is provided with a decorative panel 34.A front rubber pad 35 is provided on the inner side of the front clamping arm 1, and a rear rubber pad 36 is provided on the inner side of the rear clamping arm 2. The length of the front clamping arm 1 is greater than the length of the rear clamping arm 2. Part of the front rubber pad 35 is embedded in the front clamping arm 1, and part of the rear rubber pad 36 is embedded in the rear clamping arm 2.
[0039] When in use, the clamping arm is opened and clamped to the position where the guitar needs to be tuned, the clamping arm is clamped, and the adjusting knob and the front clamping arm are driven to translate toward the rear clamping arm through the threaded adjusting rod, so that the front clamping arm and the rear clamping arm are clamped on the guitar. At this time, the spring clamping is adjusted by the spring retaining ring inside the inner sleeve. Since the front clamping arm and the rear clamping arm are clamped by translation rather than by rotating the fulcrum, the upper and lower clamping forces of the front clamping arm and the rear clamping arm are kept as consistent as possible, thereby ensuring the adjustment accuracy of the pitch and having a wide range of applications. When loosening, the clamping arm is opened, and the adjusting knob is driven to translate toward the opposite direction of the rear clamping arm through the threaded adjusting rod. At this time, the spring is reset, which will push the front clamping arm to move in the opposite direction of the rear clamping arm to release the guitar.
[0040] When tuning is required, connect the sound testing instrument to the guitar. When the tone is too high or too low, open the clamping arm and drive the adjusting knob to move in the opposite direction of the rear clamping arm through the threaded adjustment rod. At this time, the spring resets and pushes the front clamping arm to move in the opposite direction of the rear clamping arm, exposing the adjustment scale on the inner sleeve. After manually rotating the adjustment knob to a certain angle, record the position of the adjustment scale, then clamp the clamping arm again and continue to test the tone until the tone is accurate. At this time, you can also judge the scale that needs to be adjusted at this position of the guitar by observing the position of the adjustment indicator mark on the adjustment knob, and record the position of the adjustment indicator mark. The next time you use it, you don’t need to open the clamping arm again for adjustment. You only need to align the adjustment indicator mark directly with the position. It is very convenient to use.
[0041] In the present invention, the front clamping arm is clamped onto the strings on the front side of the guitar. Since the strings have a certain tension, the spring can buffer the tension of the strings to a certain extent and will not cause rigid compression on the strings.
[0042] The plane bearing in the present invention is a small-sized plane bearing purchased from the market, and its main function is to ensure that the rotation of the adjusting knob is smooth, stable and reliable.
[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A capo with accurate and convenient clamping force adjustment, comprising a front clamping arm and a rear clamping arm that cooperate with each other, a clamping arm for clamping the two together, a pull rod and a spring that cooperate with the clamping arm, characterized in that: An adjusting inner sleeve is provided at the top of the front clamping arm, and an adjusting limit sleeve matching the adjusting inner sleeve is provided at the top of the rear clamping arm. The pull rod adopts a threaded adjusting pull rod, one end of the threaded adjusting pull rod is connected to the clamping arm, and the spring is sleeved on the threaded adjusting pull rod. A spring retaining ring matching the spring is provided inside the adjusting inner sleeve, and the other end of the threaded adjusting pull rod passes through the adjusting inner sleeve and the top of the front clamping arm and is connected to an adjusting knob. An adjusting scale is provided on the adjusting inner sleeve, and an adjusting indication mark matching the adjusting scale is provided on the outer side of the adjusting knob; a plurality of balls are provided between the adjusting inner sleeve and the adjusting limit sleeve, and the balls, the adjusting inner sleeve and the adjusting limit sleeve constitute a linear bearing, and a plane bearing is provided between the adjusting knob and the front clamping arm.
2. A capo with accurate and convenient clamping force adjustment as claimed in claim 1, characterized in that: The adjusting knob comprises an integrally formed knob body and an internal thread joint, the internal thread joint is connected to a threaded adjusting rod, the plane bearing is located between the knob body and the front clamping arm, and the adjusting indication mark is arranged on the outside of the knob body.
3. A capo with accurate and convenient clamping force adjustment as claimed in claim 2, characterized in that: The threaded adjustment pull rod includes an integrally formed external thread section and a smooth rod section, the other end of the external thread section is connected to an internal thread joint, the other end of the smooth rod section is connected to a clamping arm, and a connecting short rod matching the clamping arm is provided at the end of the smooth rod section, and a pull rod groove matching the smooth rod section and a cam head matching the connecting short rod are provided at the top of the clamping arm.
4. A capo with accurate and convenient clamping force adjustment as claimed in claim 2, characterized in that: The outer side of the top of the front clamping arm is provided with a circular concave matched with the internal thread joint and an arc-shaped notch matched with the knob body, and the outer side surface of the knob body is flush with the outer side surface of the front clamping arm at the position of the arc-shaped notch.
5. A capo with accurate and convenient clamping force adjustment as claimed in claim 1, characterized in that: The cross section of the adjusting inner sleeve is square, and ball grooves for matching balls are provided on the outer sides of the four corners. The cross section of the adjusting limit sleeve is also square, and ball grooves for matching balls are provided on the inner sides of the four corners, and an arc chamfer is provided at the end of the adjusting inner sleeve.
6. A capo with accurate and convenient clamping force adjustment as claimed in claim 1, characterized in that: A gap is left between the minimum scale position on the adjustment scale and the fixed end of the adjustment inner sleeve to cooperate with the movement of the clamping arm. The maximum scale position on the adjustment scale is located in the middle position of the adjustment inner sleeve. When the adjustment knob rotates one circle, the distance moved by the adjustment inner sleeve is the distance between the maximum scale position and the minimum scale position.
7. A capo with accurate and convenient clamping force adjustment as claimed in claim 3, characterized in that: A support block matching the clamping arm is provided on the top of the rear clamping arm, and a cam groove matching the clamping arm and a limit groove matching the threaded adjustment rod are provided on the support block.
8. A capo with accurate and convenient clamping force adjustment as claimed in claim 2, characterized in that: The end of the adjustment limit sleeve is provided with a limit end cover, and the rear of the rear clamping arm is provided with a clamping arm groove that matches the clamping arm. The clamping arm is located in the clamping arm groove when clamping, and the outer side surface of the clamping arm is flush with the rear surface of the rear clamping arm.
9. A capo with accurate and convenient clamping force adjustment as claimed in claim 2, characterized in that: The outer ring of the knob body is provided with anti-slip grooves, and the outer side surface of the knob body is provided with a decorative panel.
10. A capo with accurate and convenient clamping force adjustment as claimed in claim 2, characterized in that: A front rubber pad is provided on the inner side of the front clamping arm, and a rear rubber pad is provided on the inner side of the rear clamping arm. The length of the front clamping arm is greater than the length of the rear clamping arm. Part of the front rubber pad is embedded in the front clamping arm, and part of the rear rubber pad is embedded in the rear clamping arm.