Special screwdriver for piano tuning and use method thereof

Abstract

The invention provides a special screwdriver for piano tuning and a using method thereof. The screwdriver comprises a grab handle and a grab rod, a containing groove is formed in the grab handle, a mounting part is arranged at one end of the grab handle, the grab rod is detachably connected with the mounting part, and one side of the grab rod is inserted into the containing groove through the mounting part; the two ends of the holding rod are provided with the tool bit connecting rods, and one ends of the two tool bit connecting rods are provided with the linear tool bit and the cross-shaped tool bit respectively. A plurality of anti-skidding protruding blocks are installed on the surface of the cross-shaped tool bit, a plurality of anti-skidding protruding strips are installed on one side of the straight-line-shaped tool bit, and the straight-line-shaped tool bit and the cross-shaped tool bit are both designed to be variable in diameter. According to the screwdriver, the straight screwdriver head and the cross screwdriver head are combined together, the placing space can be saved, the anti-skid protruding strips of the straight screwdriver head or the anti-skid protruding blocks of the cross screwdriver head make contact with the inner wall of a screw hole groove, the friction force between the anti-skid protruding strips and the screw hole groove can be increased, and the screwdriver is prevented from sliding off or slipping in the rotating process; the cross-shaped tool bit and the linear tool bit are subjected to reducing treatment so as to be attached to a piano sound stopper, a linkage device, a rotating machine and the like, and wood parts are protected.

Description

Technical Field

[0001] The invention relates to the technical field of tuning screwdrivers, and in particular to a special screwdriver for piano tuning and a use method thereof. Background Art

[0002] A piano tuning screwdriver is an indispensable tool in the piano tuning process. It is mainly used to tighten or loosen the screws inside the piano to adjust the mechanical parts and pitch of the piano. Piano tuning screwdrivers usually have specific sizes and shapes to accommodate different positions and types of screws inside the piano.

[0003] In the prior art, piano tuning screwdrivers are usually in the shape of a cross or a flat head, and the surfaces of the cross head and the flat head are both designed to be smooth. The screwdriver head with a smooth surface is easy to slip off when the screw is rotated, especially after the screw is tightened or loosened to a certain extent, the contact area between the screw hole and the screwdriver is reduced, and the friction force is also reduced accordingly. The sudden slippage of the screwdriver head may also cause damage to the mechanical parts of the piano. Therefore, a special screwdriver for piano tuning is needed to meet people's needs. Summary of the invention

[0004] In view of the technical problem that a screwdriver head surface designed to be smooth is prone to slipping during use, a special screwdriver for piano tuning and a method of using the same are provided.

[0005] The technical means adopted by the present invention are as follows:

[0006] A special screwdriver for piano tuning, comprising: a handle and a handle rod, wherein a storage groove is provided inside the handle, a mounting portion is provided at one end of the handle, the handle rod is detachably connected to the mounting portion, and one side of the handle rod is inserted into the storage groove through the mounting portion;

[0007] Both ends of the grip rod are equipped with a blade connecting rod, and the ends of the two blade connecting rods that are far away from each other are respectively equipped with a flat blade and a cross blade, and the flat blade or the cross blade is placed in the storage groove;

[0008] A plurality of anti-skid protrusions are installed on the surface of the cross cutter head, a plurality of anti-skid protrusions are installed on one side of the slotted cutter head, and both the slotted cutter head and the cross cutter head adopt a variable diameter design.

[0009] Furthermore, the mounting portion comprises a U-shaped connection seat mounted on one end of the handle, the grip rod is movably connected to the U-shaped connection seat, a clamping structure is rotatably connected to the U-shaped connection seat, and the clamping structure is used to clamp and fix the grip rod.

[0010] Furthermore, the clamping structure includes a mounting seat rotatably mounted on the U-shaped connecting seat, a clamping seat is mounted on the mounting seat, a connecting hole 1 is opened inside the clamping seat, the gripping rod is movably mounted in the connecting hole 1, and two positioning screws are threadedly mounted on both sides of the clamping seat, and the ends of the two positioning screws inserted into the connecting hole 1 are in contact with the surface of the gripping rod.

[0011] Furthermore, a linkage ratchet and two limit shafts are rotatably installed inside the mounting seat, the linkage ratchet is installed between the two limit shafts, the grip rod is movably installed inside the linkage ratchet and the two limit shafts, the limit shaft away from the U-shaped connecting seat is connected to the clamping seat, the linkage ratchet is connected to a limit structure, and the limit structure is placed inside the mounting seat.

[0012] Furthermore, a connecting hole 1 is provided inside the limit shaft, and the connecting holes 1 of the two limit shafts are connected to the connecting hole 1 of the clamping seat. A connecting hole 2 is provided inside the linkage ratchet, and the connecting hole 2 is connected to the three connecting holes 1. The grip rod is movably installed in the three connecting holes 1 and the connecting hole 2.

[0013] Furthermore, the limiting structure includes at least one fixed shaft installed on the inner wall of the mounting seat, and a limiting pawl is rotatably installed on the fixed shaft, one of the limiting pawls is engaged with the linkage ratchet, and a torsion spring is sleeved on the fixed shaft, one end of the torsion spring is connected to the fixed shaft, and the other end is connected to the inner wall of the limiting pawl.

[0014] Furthermore, a limit seat is installed on the inner wall of the mounting seat, and the limit seat is in contact with a limit pawl engaged with the linkage ratchet.

[0015] Further, a rotating shaft is rotatably installed inside the mounting seat, and an adjustment structure is connected to the rotating shaft. The adjustment structure includes a lever, and the lever is installed at one end of the rotating shaft and is located outside the mounting seat. An arc-shaped push rod is installed on one side of the lever. An arc-shaped limiting groove is opened inside the mounting seat, and the arc-shaped push rod is slidably installed in the arc-shaped limiting groove.

[0016] The fixed shafts are provided with two, and the two fixed shafts are both rotatably mounted with limit pawls, when one limit pawl is engaged with the linkage ratchet, the other limit pawl is disengaged from the linkage ratchet, and the arc push rod contacts the limit pawl disengaged from the linkage ratchet.

[0017] Furthermore, a limiting screw is movably installed inside the shifting rod, two limiting screw holes are provided inside the mounting seat, and the limiting screw is threadably installed in one of the limiting screw holes.

[0018] The present invention also provides a method for using a special screwdriver for piano tuning, comprising the following steps:

[0019] When performing piano tuning operations, insert the cross cutter head or the flat cutter head into the hole groove of the tuning screw of the corresponding shape, so that the anti-skid protrusion or the anti-skid protrusion contacts the inner wall of the corresponding hole groove, thereby increasing the friction between the cross cutter head or the flat cutter head and the hole groove of the tuning screw, and the cross cutter head and the flat cutter head are both reduced in diameter so as to fit the piano mute, linkage, and rotary machine and protect wooden parts; the grip rod adopts a hexagonal design, which is convenient for users to hold and use, and the grip rod is sleeved with a handle for use. When installing, the cutter head to be used faces outward, and the cutter head not to be used faces the grip rod, and the grip rod is aligned with the connecting hole 1 and the connecting hole 2 and inserted into the storage groove. After adjusting the insertion depth, the positioning screws on both sides are rotated. When the positioning screw rod rotates, it moves by cooperating with the thread of the clamping seat, so that the moving positioning screw rod is pressed against the surface of the grip rod, and the grip rod is fixed to prevent loosening during use. At this time, when the grip handle is rotated, the grip rod is driven to rotate through the storage groove to adjust the tightness of the screw;

[0020] After the grip is pulled out from the grip and the mounting seat, the grip is flipped to drive the U-shaped connecting seat to rotate on the mounting seat, thereby adjusting the direction and angle of the grip, and at the same time making the storage groove on the grip deviate from connecting hole two and connecting hole one. At this time, the grip is reinserted into connecting hole one and connecting hole two, and fixed with the positioning screw, and the protruding length of one end of the cross cutter head or the slotted cutter head is adjusted according to the depth of the tuning screw. The direction is adjusted according to the cutter head to be used, and after the cross cutter head or the slotted cutter head is inserted into the screw hole slot, the grip is pushed to drive the U-shaped connecting seat to rotate, so that the U-shaped connecting seat drives the mounting seat to rotate, and the mounting seat drives the internal limit pawl to perform circular motion when rotating, and the limit pawl is meshed with the linkage ratchet. When the limit pawl moves in a circle, it abuts against the linkage ratchet and drives the linkage ratchet to rotate, so that the linkage ratchet drives the linkage ratchet through connecting hole two. The grip rod rotates to loosen or tighten the screw; when the grip is pushed in the opposite direction, the mounting seat is driven to rotate in the opposite direction, and the mounting seat drives the limit pawl to perform circular motion in the opposite direction. The limit pawl is in an active state when it moves in the opposite direction, so that the limit pawl is squeezed by the tooth block on the linkage ratchet during the reverse movement and flips on the fixed shaft. When the limit pawl flips, the torsion spring is compressed and disengaged from the tooth groove on the linkage ratchet. When the limit pawl and the tooth groove of the linkage ratchet are re-aligned, the compressed torsion spring drives the limit pawl to flip and reset and re-engage in the tooth groove. The screw can be loosened or tightened continuously by shaking the grip handle back and forth. By flipping the grip handle to adjust the angle, the user can adjust the angle and operating posture of the screwdriver according to the specific situation, and adjust the direction and strength of the force so as to transmit the force to the screwdriver head, which is helpful for tightening and installing tighter screws.

[0021] The angle restriction on the lever is released by rotating the limit screw and unscrewing it from the corresponding limit screw hole. At this time, the lever is flipped so that it drives the arc push rod to move in the arc limit groove, and the moving arc push rod is disengaged from the squeezing of one of the limit pawls. At this time, the corresponding torsion spring drives the limit pawl to flip and engage with the linked ratchet. The continuously moving arc push rod will squeeze the other limit pawl again, so that the limit pawl is disengaged from the engagement with the linked ratchet. At this time, the direction of tightening the screw by pushing the handle is opposite to the previous direction, so that it can be adjusted according to the tightening direction of the screw and the usage habits. After the adjustment is completed, the limit screw is passed through the lever again and screwed into another limit screw hole to limit the angle of the lever again and complete the adjustment operation.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The piano tuning screwdriver provided by the present invention and the method of using the same can save placement space by combining a flat blade head with a cross blade head. When the cross blade head or the flat blade head is inserted into a piano screw for tuning, the corresponding anti-skid protrusion or anti-skid protrusion will contact the inner wall of the screw hole groove, thereby increasing the friction between the cross blade head, the flat blade head and the screw hole groove, preventing the screwdriver from slipping or sliding during rotation. Moreover, the cross blade head and the flat blade head are both reduced in diameter so as to fit the piano mute, linkage, rotary machine, etc., and can protect wooden parts to a certain extent.

[0024] 2. The special screwdriver for piano tuning provided by the present invention and the method of using the same can be used. When in use, the screwdriver can be sleeved on a grip rod for easy gripping, and the angle of the grip rod can be adjusted according to usage habits and usage environment. Placing the grip rod horizontally can better exert force, which is helpful for tightening tighter screws. After the grip rod angle is adjusted, the ratchet structure provided in the mounting seat can be used to control the rotation of the grip rod. The screw can be loosened or tightened by simply shaking the grip rod back and forth, which reduces the time required for frequent changes in gripping methods and repositioning of screws.

[0025] 3. The special piano tuning screwdriver and the use method thereof provided by the present invention can release the restriction on the lever by unscrewing the limit screw. At this time, the angle of the two limit pawls can be adjusted by pushing the lever, and the other limit pawl is switched to engage with the linkage ratchet. At this time, when tightening the screw, the handle needs to be shaken in the opposite direction to the previous direction, so as to adjust the operation direction according to the use environment and adjust the direction of shaking the handle according to the use environment.

[0026] Based on the above reasons, the present invention can be widely promoted in the fields of piano tuning and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of the special screwdriver for piano tuning.

[0029] Figure 2 The present invention is a schematic diagram of the grip structure of the special piano tuning screwdriver provided by the present invention.

[0030] Figure 3 The present invention is a schematic structural diagram of the cross blade head of the special piano tuning screwdriver.

[0031] Figure 4 The present invention is a schematic diagram of the structure of a slotted blade of a special screwdriver for piano tuning.

[0032] Figure 5 The present invention is a schematic diagram of the cross-sectional structure of the special screwdriver for piano tuning proposed by the present invention.

[0033] Figure 6 The present invention is a schematic diagram of the mounting base structure of the special piano tuning screwdriver proposed by the present invention.

[0034] Figure 7 The present invention is a schematic diagram of the cross-sectional structure of the mounting base of the special piano tuning screwdriver proposed by the present invention.

[0035] Figure 8 The present invention is a schematic cross-sectional structural diagram of a clamping seat of a special piano tuning screwdriver.

[0036] Fig. 9 The present invention is a schematic diagram of the linkage ratchet structure of the special piano tuning screwdriver proposed by the present invention.

[0037] Fig.10 The present invention is a schematic diagram of the handle flipping structure of the special piano tuning screwdriver.

[0038] In the figure: 100, handle; 101, storage slot; 200, grip rod; 201, blade connecting rod; 202, flat blade; 203, cross blade; 204, anti-skid protrusion; 205, anti-skid convex strip; 300, U-shaped connecting seat; 301, mounting seat; 302, limiting shaft; 303, clamping seat; 304, positioning screw; 305, connecting hole one; 400, linkage ratchet; 401, fixed shaft; 402, limiting pawl; 403, torsion spring; 404, limiting seat; 405, connecting hole two; 500, rotating shaft; 501, lever; 502, arc push rod; 503, arc limiting groove; 504, limiting screw; 505, limiting screw hole. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] Example 1

[0047] See also Figure 1-Figure 10 The present invention provides a special screwdriver for piano tuning, comprising a handle 100, a storage slot 101 is provided inside the handle 100, a handle 200 is detachably installed in the storage slot 101, a cutter head connecting rod 201 is installed at both ends of the handle 200, a flat cutter head 202 and a cross cutter head 203 are installed at the ends away from each other, the flat cutter head (202) or the cross cutter head (203) is placed in the storage slot (101), and the cross cutter head 203 is installed at the ends of the two cutter head connecting rods 201. Several anti-skid protrusions 204 are installed on the surface of 03, and several anti-skid convex strips 205 are installed on one side of the flat blade head 202. Both the flat blade head 202 and the cross blade head 203 adopt a variable diameter design. When the cross blade head 203 or the flat blade head 202 is inserted into the hole groove of the tuning screw of the corresponding shape, the anti-skid protrusions 204 or the anti-skid convex strips 205 will contact with the inner wall of the corresponding hole groove, thereby increasing the friction between the cross blade head 203 or the flat blade head 202 and the tuning screw hole groove.

[0048] A U-shaped connecting seat 300 is installed at one end of the handle 100, and the U-shaped connecting seat 300 is movably installed on the grip rod 200. The U-shaped connecting seat 300 is connected to a clamping structure, and a linkage ratchet 400 and a rotating shaft 500 are connected to the clamping structure. The linkage ratchet 400 is connected to a limiting structure, and the rotating shaft 500 is connected to an adjustment structure. The cross cutter head 203 or the slotted cutter head 202 can be inserted into the hole groove of the corresponding shape of the tuning screw and rotated to tighten the screw. The grip rod 200 adopts a hexagonal design, which is convenient for users to hold and use.

[0049] Preferably, the lengths of the straight blade head 202 and the cross blade head 203 are both 0.8 cm, the length of the handle 200 is 14 cm, and the length of the blade head connecting rod 201 is 4.2 cm.

[0050] The present invention can save placement space by combining a flat blade bit with a cross blade bit. When the cross blade bit or the flat blade bit is inserted into a piano screw for tuning, the corresponding anti-skid protrusion or anti-skid protrusion will contact the inner wall of the screw hole groove, thereby increasing the friction between the cross blade bit, the flat blade bit and the screw hole groove, preventing the screwdriver from slipping or sliding during rotation. Moreover, both the cross blade bit and the flat blade bit are reduced in diameter so as to fit the piano mute, linkage, rotary machine, etc., and can protect wooden parts to a certain extent.

[0051] Example 2

[0052] like Figure 1-Figure 10In order to facilitate the adjustment of the extension length of the grip 200, a clamping structure is arranged on the U-shaped connecting seat 300, and the clamping structure includes a mounting seat 301, and the mounting seat 301 is rotatably mounted on the U-shaped connecting seat 300. Two limiting shafts 302 are rotatably mounted inside the mounting seat 301, and a clamping seat 303 is mounted on one side of the corresponding limiting shaft 302. Two positioning screws 304 are installed on the internal threads of the clamping seat 303 on both sides. One end of the two positioning screws 304 is in contact with the surface of the grip 200, and the limiting shaft 302 and the clamping seat 303 are in contact with each other. A connecting hole 305 is provided inside the connecting hole 305, and the grip rod 200 is movably installed in the connecting hole 305. The grip rod 200 is aligned with the connecting hole 305 and the connecting hole 2 405 inside the linkage ratchet 400 and inserted into the storage groove 101. After adjusting the insertion depth, the positioning screw rods 304 on both sides can be rotated. The positioning screw rods 304 can move when they rotate, so that the positioning screw rods 304 can be pressed against the surface of the grip rod 200 to fix the grip rod 200, and the moving distance of the grip rod 200 can be adjusted according to usage requirements. The remaining features are the same as those in Example 1.

[0053] Example 3

[0054] like Figure 7-Figure 9 In order to facilitate adjusting the operating angle and operating posture of the screwdriver according to the usage, a limiting structure is arranged on the linkage ratchet 400, and the limiting structure includes two fixed shafts 401, and the two fixed shafts 401 are both mounted on the inner wall of the mounting seat 301. The two fixed shafts 401 are rotatably mounted with limiting pawls 402, and the corresponding limiting pawls 402 are meshed with the linkage ratchet 400. The linkage ratchet 400 is mounted between the two limiting shafts 302, and the linkage ratchet 400 is rotatably mounted inside the mounting seat 301. One end of two torsion springs 403 are respectively mounted on the two fixed shafts 401, and the two torsion springs 403 are connected to each other. The other ends of the two limit pawls 402 are respectively mounted on the inner walls of the two limit pawls 402, the two torsion springs 403 are respectively sleeved on the two fixed shafts 401, the inner wall of the mounting seat 301 is installed with a limit seat 404, the limit seat 404 is in contact with the corresponding limit pawl 402, the interior of the linkage ratchet 400 is provided with a second connecting hole 405, the second connecting hole 405 is connected with the first connecting hole 305, the grip 200 is movably mounted in the second connecting hole 405, after the grip 200 is pulled out from the grip 100 and the mounting seat 301, the direction and angle can be adjusted by flipping the grip 100, and the grip 200 can be reinserted and fixed, presenting a Fig.10When in use, the handle 100 can be pushed to drive the U-shaped connecting seat 300 and the mounting seat 301 to rotate. Through the meshing cooperation between the limit pawl 402 and the linkage ratchet 400, the mounting seat 301 can drive the handle 200 to rotate when it rotates, so as to loosen or tighten the screw. When the handle 100 is pushed in the reverse direction, the limit pawl 402 will be driven to move in the reverse direction. When the limit pawl 402 moves in the reverse direction, it is in an active state, so that the screw can be loosened or tightened continuously by shaking the handle 100 back and forth. The other features are the same as those of Example 2. The present invention is convenient for operators to hold and apply force, and the screw can be loosened or tightened by shaking the handle back and forth.

[0055] Example 4

[0056] like Figure 6-Figure 7 In order to facilitate the adjustment of the direction of the shaking handle 100, an adjustment structure is arranged on the rotating shaft 500, and the adjustment structure includes a lever 501, the lever 501 is installed at one end of the rotating shaft 500, and the rotating shaft 500 is rotatably installed inside the mounting seat 301, an arc-shaped push rod 502 is installed on one side of the lever 501, and an arc-shaped limiting groove 503 is opened inside the mounting seat 301, and the arc-shaped push rod 502 is slidably installed in the arc-shaped limiting groove 503, and the arc-shaped push rod 502 contacts the corresponding limiting pawl 402, and a limiting screw 504 is movably installed inside the lever 501, and the mounting seat 301 Two limiting screw holes 505 are provided inside, and the limiting screw rod 504 is threadedly installed in the corresponding limiting screw hole 505. Rotating the limiting screw 504 and screwing it out can release the angle limit of the lever 501. At this time, the lever 501 can be flipped to drive the arc push rod 502 to disengage from squeezing one of the limiting pawls 402 and make it engage with the linked ratchet 400, and the arc push rod 502 will squeeze the other limiting pawl 402 to disengage from the linked ratchet 400. At this time, the direction of loosening or tightening the screw by pushing the handle 100 is opposite to that before, and the other features are the same as those in Example 3.

[0057] Example 5

[0058] The present invention also provides a method for using a special screwdriver for piano tuning, comprising the following steps:

[0059] When tuning the piano, the cross cutter head 203 or the flat cutter head 202 can be inserted into the hole groove of the tuning screw of the corresponding shape, so that the anti-skid protrusion 204 or the anti-skid protrusion 205 contacts the inner wall of the corresponding hole groove, which can increase the friction between the cross cutter head 203 or the flat cutter head 202 and the tuning screw hole groove. The cross cutter head 203 and the flat cutter head 202 are both reduced in diameter to fit the piano mute, linkage, rotary machine, etc., which can protect wooden parts to a certain extent. The grip rod 200 adopts a hexagonal design, which is convenient for users to hold and use. At the same time, the grip rod 200 can also be sleeved with the grip handle 100 for use. When installing, The blade heads to be used face outwards, and the blade heads that are not to be used face the handle 100. Then align the handle 200 with the connecting hole 1 305 and the connecting hole 2 405 and insert them into the receiving groove 101. After adjusting the insertion depth, the positioning screws 304 on both sides can be rotated. When the positioning screws 304 rotate, they can move by cooperating with the threads of the clamping seat 303, so that the movable positioning screws 304 can be pressed against the surface of the handle 200 to fix the handle 200 to prevent it from loosening during use. At this time, when the handle 100 is held and rotated, the handle 200 can be driven to rotate through the receiving groove 101 to adjust the tightness of the screws.

[0060] After the grip 200 is pulled out from the grip 100 and the mounting seat 301, the grip 100 can be turned over to drive the U-shaped connecting seat 300 to rotate on the mounting seat 301, so that the direction and angle of the grip 100 can be adjusted, and at the same time, the storage groove 101 on the grip 100 deviates from the second connecting hole 405 and the first connecting hole 305. At this time, the grip 200 can be reinserted into the second connecting hole 405 and the first connecting hole 305, and then fixed with the positioning screw 304, and the protruding length of one end of the cross cutter head 203 or the flat cutter head 202 can be adjusted according to the depth of the tuning screw, and finally Fig.10 state, and then the direction can be adjusted according to the blade to be used. After the cross blade 203 or the flat blade 202 is inserted into the screw hole, the handle 100 can be pushed to drive the U-shaped connecting seat 300 to rotate, so that the U-shaped connecting seat 300 drives the mounting seat 301 to rotate. When the mounting seat 301 rotates, it will drive the internal limit pawl 402 to perform a circular motion. Figure 7When the limit pawl 402 moves in a circular motion, it will abut against the linkage ratchet 400 and drive the linkage ratchet 400 to rotate, so that the linkage ratchet 400 drives the grip 200 to rotate through the second connecting hole 405, thereby loosening or tightening the screw; and when the grip 100 is pushed in the reverse direction, the mounting seat 301 will be driven to rotate in the reverse direction. At this time, the mounting seat 301 can drive the limit pawl 402 to move in a circular motion in the reverse direction. When the limit pawl 402 moves in the reverse direction, it is in an active state, so that the limit pawl 402 will be squeezed by the tooth block on the linkage ratchet 400 during the reverse movement and will be fixed on the fixed shaft. 401 is flipped, and the limit pawl 402 is flipped and the torsion spring 403 is compressed and disengaged from the tooth groove on the linkage ratchet 400. When the limit pawl 402 corresponds to the tooth groove of the linkage ratchet 400 again, the compressed torsion spring 403 drives the limit pawl 402 to flip and reset and re-engage in the tooth groove. The screw can be continuously tightened by shaking the handle 100 back and forth. By flipping the handle 100 to adjust the angle, the user can adjust the angle and operating posture of the screwdriver according to the specific situation, and more easily adjust the direction and strength of his own force, so as to effectively transmit the force to the screwdriver head, which is helpful for tightening and installing tighter screws.

[0061] The angle restriction on the lever 501 can be released by rotating the limit screw 504 and screwing it out of the corresponding limit screw hole 505. At this time, the lever 501 can be flipped to drive the arc push rod 502 to move in the arc limit groove 503. The moving arc push rod 502 will be disengaged from the squeezing of one of the limit pawls 402. At this time, the corresponding torsion spring 403 will drive the limit pawl 402 to flip and engage with the linked ratchet 400, and the continuously moving arc push rod 502 will squeeze the other limit pawl 402 again, so that it will be disengaged from the linked ratchet 400. At this time, the direction of tightening the screw by pushing the handle 100 is opposite to the previous direction, so that it can be adjusted according to the tightening direction of the screw and the usage habits. After the adjustment is completed, the limit screw 504 is passed through the lever 501 again and screwed into another limit screw hole 505, so as to limit the angle of the lever 501 again and complete the adjustment operation.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A special screwdriver for piano tuning, characterized in that: include: A handle (100) and a grip rod (200), wherein a storage groove (101) is provided inside the handle (100), a mounting portion is provided at one end of the handle (100), the grip rod (200) is detachably connected to the mounting portion, and one side of the grip rod (200) is inserted into the storage groove (101) through the mounting portion; Both ends of the grip rod (200) are equipped with a blade connecting rod (201), and the ends of the two blade connecting rods (201) that are far away from each other are respectively equipped with a flat blade (202) and a cross blade (203), and the flat blade (202) or the cross blade (203) is placed in the storage groove (101); The surface of the cross cutter head (203) is provided with a plurality of anti-skid protrusions (204), and one side of the slotted cutter head (202) is provided with a plurality of anti-skid protrusions (205). Both the slotted cutter head (202) and the cross cutter head (203) are designed with variable diameters.

2. The special screwdriver for piano tuning according to claim 1, characterized in that: The mounting portion comprises a U-shaped connection seat (300) mounted on one end of the handle (100), the handle (200) is movably connected to the U-shaped connection seat (300), and a clamping structure is rotatably connected to the U-shaped connection seat (300), and the clamping structure is used to clamp and fix the handle (200).

3. The special screwdriver for piano tuning according to claim 2, characterized in that: The clamping structure comprises a mounting seat (301) rotatably mounted on a U-shaped connecting seat (300), a clamping seat (303) being mounted on the mounting seat (301), a connecting hole (305) being provided inside the clamping seat (303), the gripping rod (200) being movably mounted in the connecting hole (305), two positioning screw rods (304) being threadedly mounted on both sides of the clamping seat (303), and one end of the two positioning screw rods (304) inserted into the connecting hole (305) being in contact with the surface of the gripping rod (200).

4. The special screwdriver for piano tuning according to claim 3, characterized in that: A linkage ratchet (400) and two limit shafts (302) are rotatably mounted inside the mounting seat (301); the linkage ratchet (400) is mounted between the two limit shafts (302); the gripping rod (200) is movably mounted inside the linkage ratchet (400) and the two limit shafts (302); the limit shaft (302) away from the U-shaped connecting seat (300) is connected to the clamping seat (303); a limit structure is connected to the linkage ratchet (400); and the limit structure is placed inside the mounting seat (301).

5. The special screwdriver for piano tuning according to claim 4, characterized in that: A connecting hole (305) is provided inside the limit shaft (302), and the connecting holes (305) of the two limit shafts (302) are both connected to the connecting hole (305) of the clamping seat (303); a connecting hole (405) is provided inside the linkage ratchet (400), and the connecting hole (405) is connected to the three connecting holes (305); the gripping rod (200) is movably mounted in the three connecting holes (305) and the connecting hole (405).

6. The special screwdriver for piano tuning according to claim 4, characterized in that: The limiting structure comprises at least one fixed shaft (401) mounted on the inner wall of the mounting seat (301), a limiting pawl (402) being rotatably mounted on the fixed shaft (401), one of the limiting pawls (402) being meshed with the linkage ratchet (400), a torsion spring (403) being sleeved on the fixed shaft (401), one end of the torsion spring (403) being connected to the fixed shaft (401), and the other end being connected to the inner wall of the limiting pawl (402).

7. The special screwdriver for piano tuning according to claim 6, characterized in that: A limit seat (404) is installed on the inner wall of the mounting seat (301), and the limit seat (404) is in contact with a limit pawl (402) meshed with the linkage ratchet (400).

8. The special screwdriver for piano tuning according to claim 6, characterized in that: A rotating shaft (500) is rotatably mounted inside the mounting seat (301), and an adjustment structure is connected to the rotating shaft (500), and the adjustment structure comprises a lever (501), and the lever (501) is mounted on one end of the rotating shaft (500) and is located outside the mounting seat (301), and an arc-shaped push rod (502) is mounted on one side of the lever (501), and an arc-shaped limiting groove (503) is provided inside the mounting seat (301), and the arc-shaped push rod (502) is slidably mounted in the arc-shaped limiting groove (503); The fixed shafts (401) are provided with two, and the two fixed shafts (401) are both rotatably mounted with limit pawls (402). When one of the limit pawls (402) is engaged with the linkage ratchet (400), the other limit pawl (402) is disengaged from the linkage ratchet (400), and the arc-shaped push rod (502) contacts the limit pawl (402) that is disengaged from the linkage ratchet (400).

9. The special screwdriver for piano tuning according to claim 8, characterized in that: A limiting screw rod (504) is movably installed inside the shifting rod (501), two limiting screw holes (505) are provided inside the mounting seat (301), and the limiting screw rod (504) is threadedly installed in one of the limiting screw holes (505).

10. A method for using the piano tuning screwdriver as claimed in any one of claims 1 to 9, characterized in that: The steps include: When performing piano tuning operations, a cross cutter head (203) or a slotted cutter head (202) is inserted into a hole groove of a tuning screw of a corresponding shape, so that the anti-skid protrusion (204) or the anti-skid protrusion (205) contacts the inner wall of the corresponding hole groove, thereby increasing the friction between the cross cutter head (203) or the slotted cutter head (202) and the hole groove of the tuning screw. The cross cutter head (203) and the slotted cutter head (202) are both reduced in diameter so as to fit the piano mute, linkage, and rotary machine and protect wooden parts. The grip rod (200) is designed in a hexagonal shape, which is convenient for users to hold and use. At the same time, the grip rod (200) is sleeved with the grip handle (100) for use. When installing, the cutter head to be used is inserted into the grip rod (200). With the head facing outward, the blade head that is not to be used is directed toward the handle (100), the handle (200) is aligned with the connecting hole 1 (305) and the connecting hole 2 (405) and inserted into the receiving groove (101), and after adjusting the insertion depth, the positioning screws (304) on both sides are rotated. When the positioning screws (304) rotate, they move by cooperating with the threads of the clamping seat (303), so that the moving positioning screws (304) are pressed against the surface of the handle (200), and the handle (200) is fixed to prevent it from loosening during use. At this time, when the handle (100) is held and rotated, the handle (200) is driven to rotate through the receiving groove (101), and the screws are adjusted for tightness; After the grip (200) is pulled out from the grip (100) and the mounting seat (301), the grip (100) is turned over to drive the U-shaped connecting seat (300) to rotate on the mounting seat (301), thereby adjusting the direction and angle of the grip (100) and making the storage groove (101) on the grip (100) deviate from the connecting hole 2 (405) and the connecting hole 1 (305). At this time, the grip (200) is reinserted into the connecting hole 1 (305) and the connecting hole 2 (405), and fixed by the positioning screw (304), and the cross cutter head (200) is adjusted according to the depth of the tuning screw. 3) or the protruding length of one end of the flat blade (202), the direction is adjusted according to the blade to be used, after the cross blade (203) or the flat blade (202) is inserted into the screw hole, the handle (100) is pushed to drive the U-shaped connecting seat (300) to rotate, so that the U-shaped connecting seat (300) drives the mounting seat (301) to rotate, and the mounting seat (301) drives the internal limiting pawl (402) to perform a circular motion when rotating, and the limiting pawl (402) is meshed with the linkage ratchet (400), and the limiting pawl (402) is against the linkage ratchet (400) when the circular motion is driven to drive the linkage ratchet (400) to rotate. The movable ratchet (400) rotates, so that the linkage ratchet (400) drives the gripping rod (200) to rotate through the second connecting hole (405), thereby tightening or loosening the screw; when the gripping handle (100) is pushed in the reverse direction, the mounting seat (301) is driven to rotate in the reverse direction, and the mounting seat (301) drives the limiting pawl (402) to perform circular motion in the reverse direction. When the limiting pawl (402) moves in the reverse direction, it is in a movable state, so that the limiting pawl (402) is squeezed by the tooth block on the linkage ratchet (400) during the reverse movement and flips on the fixed shaft (401), and the limiting pawl (402) While flipping, the torsion spring (403) is compressed and disengaged from the tooth groove on the linkage ratchet (400). When the limiting pawl (402) and the tooth groove of the linkage ratchet (400) are re-aligned, the compressed torsion spring (403) drives the limiting pawl (402) to flip and reset and re-engage in the tooth groove. The screw can be tightened and loosened continuously by shaking the handle (100) back and forth. By flipping the handle (100) to adjust the angle, the user can adjust the angle and operating posture of the screwdriver according to the specific situation, and adjust the direction and strength of the force so as to transmit the force to the screwdriver head, which is helpful for tightening and installing tight screws. The limiting screw (504) is rotated and screwed out of the corresponding limiting screw hole (505) to release the angle restriction on the lever (501). At this time, the lever (501) is flipped so that the lever (501) drives the arc push rod (502) to move in the arc limiting groove (503). The moving arc push rod (502) is separated from the squeezing of one of the limiting pawls (402). At this time, the corresponding torsion spring (403) drives the limiting pawl (402) to flip and mesh with the linkage ratchet (400). The arc push rod (502) that continues to move is rotated and screwed out of the corresponding limiting screw hole (505). The push rod (502) will squeeze another limiting pawl (402) to disengage the limiting pawl (402) from the linkage ratchet (400). At this time, the direction of tightening the screw by pushing the handle (100) is opposite to that before, so that adjustment can be made according to the tightening direction of the screw and the usage habits. After the adjustment is completed, the limiting screw (504) is passed through the lever (501) again and screwed into another limiting screw hole (505), so that the angle of the lever (501) can be limited again, and the adjustment operation is completed.

Images