Universal screwdriver

Abstract

The utility model belongs to the technical field of screwdrivers, and particularly relates to a universal screwdriver to solve the problems that an integrated linear screwdriver is narrow in application range and difficult to be flexibly applied to disassembly and assembly of screws with shelters or in narrow and small spaces, the universal screwdriver comprises a screwdriver handle and a screwdriver head, and further comprises a screwdriver rod connected with the screwdriver handle and the screwdriver head, the cutter bar comprises a plurality of cutter bar sections which are connected in series and are universally connected in sequence; the protection device comprises a plurality of protection sleeves rotationally arranged on the peripheral side of the cutter bar section in a sleeving mode, and steering sleeves arranged at the universal connecting positions of the cutter bar section in a sleeving mode and used for connecting every two adjacent protection sleeves; the adjusting device is connected with the protection device, adjusts the connecting included angle between the steering sleeve and the protection sleeve and conducts locking connection between the steering sleeve and the protection sleeve. The screwdriver can be universally adjusted, and can be flexibly applied to disassembly and assembly of screws behind sheltering objects or in narrow and small spaces.

Description

Technical Field

[0001] The present application belongs to the technical field of screwdrivers, and more specifically, relates to a universal screwdriver. Background Art

[0002] A screwdriver is a tool used for fastening, connecting or removing. By tightening or loosening screws, a screwdriver can achieve a firm connection or disassembly of equipment components.

[0003] At present, most screwdrivers are of one-piece linear type and can only be used to dismantle and install screws in the installation space. When dismantling and installing screws in obstructions or in a narrow space, it is difficult for the one-piece linear screwdriver to insert into the installation position of the screw. Generally, the obstruction needs to be removed and the narrow space needs to be expanded to solve the problem. This process is time-consuming, labor-intensive, and inefficient, and urgently needs to be improved. Utility Model Content

[0004] In view of the defects of the prior art, the purpose of this application is to provide a universal screwdriver, aiming to solve the problem that linear screwdrivers have a narrow application range and are difficult to flexibly use to remove screws in obstructions or narrow spaces.

[0005] To achieve the above object, the present application provides a universal screwdriver, including a handle and a cutter head, and also includes:

[0006] A tool bar, which is connected to the tool handle and the tool head, and the tool bar includes a plurality of tool bar segments which are connected in series and universally connected in sequence;

[0007] The protection device comprises a plurality of protection sleeves rotatably sleeved on the circumference of the cutter bar segment, and a steering sleeve sleeved on the universal joint of the cutter bar segment and connecting two adjacent protection sleeves;

[0008] The adjusting device connected with the protecting device adjusts the connection angle between the steering sleeve and the protecting sleeve and performs locking connection between the steering sleeve and the protecting sleeve.

[0009] The above technical scheme conceived by the present application, compared with the prior art, since the multiple shank segments in the screwdriver are universally connected in sequence, after adjusting the adjusting device, the connection angle between the steering sleeve and the protective sleeve can be adjusted, and then the curvature between the shank and the handle can be adjusted, so that the universal screwdriver in the present technical scheme is used as a tool for fastening or disassembly, especially suitable for disassembling and assembling screws behind obstructions or screws in narrow spaces, which greatly improves work convenience and work efficiency; in addition, the protective device can also support and protect the shank to prevent the shank segments and the connection between the shank segments from being damaged by collisions.

[0010] As a further preference, the protective sleeve / steering sleeve close to the tool handle is arranged on the outer periphery of the protective sleeve / steering sleeve away from the tool handle, and a notch is left at the end of the protective sleeve and / or steering sleeve for forming a connection angle between the protective sleeve and the steering sleeve.

[0011] By adopting the above technical solution, since the protective sleeve and the steering sleeve are nested in layers, when the universal screwdriver is in a straight state or adjusted to a desired curved state, the protective sleeve and the steering sleeve can not only provide good protection for the tool rod, but can also serve as a shaping and positioning bracket for the tool rod to support and position the tool rod, thereby ensuring the stability of the universal screwdriver.

[0012] As further preferred, the adjusting device comprises an adjusting screw, an adjusting nut and a gasket, one of the protective sleeve and the steering sleeve is connected to the adjusting screw for anti-rotation, the other of the steering sleeve and the protective sleeve is connected to one of the steering sleeve for anti-rotation and the adjusting screw, and the steering sleeve is rotatably connected to the protective adjusting screw;

[0013] The adjusting nut is threadedly connected with the adjusting screw and is used for loosening or tightening the protective sleeve and the steering sleeve;

[0014] The washer is mounted on the adjusting screw in a rotation-resistant manner. The washer has a first protrusion structure for contacting the protective sleeve or the steering sleeve. When the adjusting nut locks the protective sleeve and the steering sleeve, the steering sleeve and the protective sleeve no longer rotate relative to each other.

[0015] By adopting the above technical solution, since the other of the protective sleeve and the steering sleeve is rotatably connected to the adjusting screw, the staff can loosen the adjusting nut to rotate the protective sleeve and the steering sleeve relative to each other, thereby adjusting the connection angle of the protective sleeve and the steering sleeve. When the protective sleeve and the steering sleeve are adjusted to the required connection angle, the protective sleeve and the steering sleeve are locked by screwing the adjusting nut, and when tightening, the gasket with the first protruding structure prevents the steering sleeve and the protective sleeve from rotating relative to each other, so that the steering sleeve and the protective sleeve remain fixed, so that the structures of the universal screwdriver remain stable, and the screwdriver is convenient for tightening or removing screws under required working conditions.

[0016] As a further preferred embodiment, the side walls of the head and / or the rod of the adjusting screw have a plurality of side edges formed by the wall thickness protruding outward, one of the protective sleeve and the steering sleeve is provided with a polygonal hole for the plurality of side edges to fit, and the other of the protective sleeve and the steering sleeve is provided with a through hole that matches the clearance of the rod of the adjusting screw.

[0017] By adopting the above technical scheme, since the inner wall of the polygonal hole fits with the polygonal surface of the adjusting screw, and the through hole and the rod clearance of the adjusting screw are matched, it is difficult for one of the protective sleeve and the steering sleeve to rotate relative to the adjusting screw, but the other of the protective sleeve and the steering sleeve can rotate relative to the adjusting screw. The through hole and the polygonal hole provide an installation basis for the installation of the protective sleeve and the steering sleeve, and also provide favorable conditions for the staff to adjust the angles of the protective sleeve and the steering sleeve.

[0018] As further preferred, the first protrusion structure includes first limiting teeth distributed radially, and the surface of the other of the protective sleeve and the steering sleeve is provided with second limiting teeth that mesh with the first limiting teeth.

[0019] By adopting the above technical solution, since the gasket is installed between the adjusting nut and the adjusting screw in a rotation-resistant manner, after adjusting the connection angle of the steering sleeve and the protective sleeve, by tightening the adjusting nut, the gasket can contact the second limiting tooth on the protective sleeve or the steering sleeve under the push of the adjusting nut, thereby realizing the mutual engagement of the first limiting tooth and the second limiting tooth, so that the adjusting screw, adjusting nut, gasket, protective sleeve and steering sleeve remain locked, so that the tool rod can be stably maintained in the current bending state.

[0020] As a further preferred embodiment, a universal joint for universally connecting the two adjacent tool bar segments is provided between the two adjacent tool bar segments.

[0021] By adopting the above technical solution, adjacent tool bar segments are connected by universal joints, and are also connected by steering sleeves and protective sleeves, so that the tool bar composed of multiple tool bar segments has the characteristics of flexibility and stability.

[0022] As a further preferred embodiment, the universal joint comprises two mutually connected universal joints, and the two universal joints are universally connected to the two tool rod sections one by one.

[0023] By adopting the above technical solution, the two universal joints are arranged so that the two tool rod sections can be flexibly adjusted in universal directions.

[0024] As a further preferred embodiment, a first limiting protrusion is formed on the surface of the shank segment protruding in the circumferential direction, the protective sleeve has a first annular groove, and the surface of the first limiting protrusion is slidably fitted with the inner wall of the first annular groove.

[0025] By adopting the above technical solution, the first limiting protrusion and the first annular groove cooperate with each other, so that the protective sleeve is stably connected to the knife rod segment and can rotate on the knife rod segment.

[0026] As a further preferred embodiment, the protection device further comprises a position fixing sleeve coaxially rotating on the peripheral side of the knife handle, and the position fixing sleeve is coaxially connected to an adjacent protection sleeve;

[0027] The inner wall of the position fixing sleeve is formed with a second limiting protrusion protruding along the circumferential direction, and the circumference of the tool handle has a second annular groove for slidingly matching with the second limiting protrusion.

[0028] By adopting the above technical solution, the provided position fixing sleeve can connect the protective sleeve to the shank through the cooperation of the second limiting protrusion and the second ring groove, and the staff can press the position fixing sleeve to make it difficult for the protective device to rotate.

[0029] As a further preferred embodiment, a magnetic engagement groove for engaging the tool head is formed at the end of a tool rod section away from the tool handle.

[0030] By adopting the above technical solution, the cutter head and the shank section are fixed by magnetic attraction, which makes it convenient for the staff to install the cutter head of the corresponding model on the shank section according to the model of the screw to be disassembled, thereby improving the versatility and flexibility of the universal screwdriver.

[0031] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art:

[0032] 1. The tool bar is composed of multiple tool bar sections that are universally connected in sequence, and can be flexibly universally adjusted; the protective cover in the protective device can not only protect the tool bar, but also serve as a basis for the adjustment device to adjust and lock the bending state of the tool bar, thereby realizing universal adjustment of the screwdriver, making it convenient for the screwdriver to be used for tightening or disassembling screws behind obstructions or screws in narrow spaces.

[0033] 2. Since one of the protective sleeve and the steering sleeve is anti-rotationally connected to the adjusting screw, and the other of the steering sleeve and the protective sleeve is rotationally connected to the adjusting screw, the staff can loosen the adjusting nut to adjust the connection angle of the protective sleeve and the steering sleeve; when the protective sleeve and the steering sleeve are adjusted to the required connection angle, the steering sleeve and the protective sleeve are prevented from rotating relative to each other by the gasket, and the protective sleeve and the steering sleeve are locked by screwing the adjusting nut to keep the steering sleeve and the protective sleeve fixed, so that the various structures of the universal screwdriver can be kept stable.

[0034] 3. Adjacent tool bar segments are connected by universal joints, and are also connected by steering sleeves and protective sleeves, so that the tool bar composed of multiple tool bar segments has the characteristics of flexibility and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the universal screwdriver in the embodiment of the present application when it is in a straight line state;

[0036] Figure 2 is a schematic structural diagram of a universal screwdriver in an embodiment of the present application in a bent state;

[0037] Figure 3 It is a schematic diagram of the connection structure of the tool handle, the universal joint and the tool rod in a bent state in an embodiment of the present application;

[0038] Figure 4 It is a schematic diagram of the connection structure of the tool handle, the universal joint and the tool rod in a straight state in an embodiment of the present application;

[0039] Figure 5 is an exploded view of the protection device in the embodiment of the present application;

[0040] Figure 6 This is a schematic diagram of the overall structure of the steering sleeve in the embodiment of the present application;

[0041] Figure 7 It is a schematic diagram of the partial structure of the steering sleeve in the embodiment of the present application;

[0042] Figure 8 It is an exploded view of the regulating device in the embodiment of the present application.

[0043] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0044] 1. Tool handle; 1-1. Second annular groove; 2. Tool bar section; 2-1. Magnetic interlocking groove; 2-2. Universal joint fork; 2-3. First limiting protrusion; 3. Protective sleeve; 3-1. End cover; 3-2. First annular groove; 4. Steering sleeve; 5. Adjustment device; 5-1. Adjustment screw; 5-2. Adjustment nut; 5-3. Gasket; 6. Universal joint; 6-1. U-shaped connecting rod; 6-2. Cross shaft; 7. Connecting rod; 8. Position fixing sleeve; 9. Polygonal hole; 10. Through hole; 11. First limiting tooth; 12. Second limiting tooth. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The following is combined with Figure 1-8 This application is described in further detail.

[0050] The embodiment of the present application discloses a universal screwdriver.

[0051] Reference Figure 1-8 The universal screwdriver includes a handle 1, a shank, a bit, a protective device and an adjusting device 5. The shank is used to connect the shank 1 and the bit, and the shank includes a plurality of shank segments 2 that are connected in series and universally connected in sequence. The protective device is connected to the shank, and includes a plurality of protective sleeves 3 that are sleeved on the circumferential side of the shank segment 2, and a steering sleeve 4 that is sleeved on the universal connection of the shank segment 2 and is used to connect two adjacent protective sleeves 3; the plurality of protective sleeves 3 correspond to the plurality of shank segments 2 one by one, and the plurality of protective sleeves 3 can rotate along the circumference of the corresponding shank segment 2. The adjusting device 5 is connected to the protective device, and the adjusting device 5 is used to adjust the connection angle between the steering sleeve 4 and the protective sleeve 3, and to perform a locking connection between the steering sleeve 4 and the protective sleeve 3. The bit is a cross bit, a flat bit, a hexagonal bit, etc. commonly used in the prior art, which can be disassembled and replaced on the shank, but is not shown in the attached drawings.

[0052] Specifically, if Figure 3 and Figure 4 As shown, in this embodiment, two shank segments 2 are provided, and in other embodiments, three or four shank segments 2 may also be provided. A universal joint for universally connecting the two adjacent shank segments 2 is provided between the two adjacent shank segments 2, and a magnetic interlocking groove 2-1 is formed at the end of a shank segment 2 in the shank away from the shank 1. In this embodiment, the magnetic interlocking groove 2-1 is preferably in the shape of an inner hexagon, and a magnetic material is added to the groove body. The magnetic interlocking groove 2-1 is used for interlocking and fixing a shank head with a magnetic main body in the shape of a hexagonal column.

[0053] As a preferred example, Figure 3 and Figure 4 As shown, the universal joint includes two mutually connected universal joints 6, and the two universal joints 6 are universally connected to the two shank sections 2. As a preferred embodiment, Figure 4 As shown, the universal joint 6 is selected as a cross universal joint, and the end of the shank segment 2 is protruded to form a universal joint fork 2-2. The cross universal joint includes a U-shaped connecting rod 6-1 and a cross shaft 6-2; the cross shaft 6-2 includes two long shafts that are perpendicular to each other and intersecting, and the two ends of the length direction of one long shaft are rotatably connected to the two ends of the U-shaped connecting rod 6-1 one by one, and the two ends of the length direction of the other long shaft are rotatably connected to the universal joint fork 2-2 on the shank segment 2 respectively, and the rotation axis of the long shaft is flush with its own length direction.

[0054] It should be noted that a connecting rod 7 is connected between the U-shaped connecting rods 6-1 in two adjacent cross universal joints 6, and the two cross universal joints 6 are connected to each other through the connecting rod 7. In addition, in some embodiments, the two U-shaped connecting rods 6-1 connected to the connecting rod 7 are in a mutually perpendicular state in space, and the bending directions of the two U-shaped connecting rods 6-1 are opposite.

[0055] In other embodiments, the universal joint or the universal joint 6 may also be selected as a ball-insert universal joint or a ball-cage universal joint, etc., as long as it can achieve a universal connection between the two shank sections 2.

[0056] Furthermore, in some embodiments, the diameters of the protective sleeve 3 and the steering sleeve 4 decrease step by step in a direction away from the knife handle 1, and the protective sleeve 3 / steering sleeve 4 close to the knife handle 1 is sleeved on the outer periphery of the protective sleeve 3 / steering sleeve 4 away from the knife handle 1. In addition, a notch is left at the end of the protective sleeve 3 and / or the steering sleeve 4 for forming a connection angle between the protective sleeve 3 and the steering sleeve 4.

[0057] Further, such as Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment, a surface of a shank section 2 in the shank away from the shank handle 1 is formed with a first limiting protrusion 2-3 protruding in the circumferential direction, and the protective sleeve 3 has an annular end cover 3-1 that can be penetrated by the shank section 2, and the inner circumferential wall of the end cover 3-1 has a first annular groove 3-2. The circumferential surface of the shank section 2 is slidably fitted with the inner circumferential wall of the end cover 3-1, and the surface of the first limiting protrusion 2-3 is slidably fitted with the inner wall of the first annular groove 3-2. The first annular groove 3-2 cooperates with the first limiting protrusion 2-3 to realize the rotational connection between the protective sleeve 3 and the shank section 2.

[0058] Further, the protection device also includes a position fixing sleeve 8 coaxially and rotatably mounted on the circumference of the handle 1, and the position fixing sleeve 8 is integrally connected with the adjacent protection sleeve 3. During use, the staff can hold the position fixing sleeve 8 with their hands to prevent the protection device from rotating.

[0059] Specifically, the inner wall of the position fixing sleeve 8 is provided with a plurality of second limiting protrusions (not shown in the figure) at intervals along the axial direction, and the second limiting protrusions extend along the circumferential direction of the inner wall of the position fixing sleeve 8. The outer wall of the shank 1 is provided with a plurality of second annular grooves 1-1 at intervals along the axial direction, and the second annular grooves 1-1 extend along the circumferential direction of the outer wall of the shank 1, and the plurality of second annular grooves 1-1 of the shank 1 are slidably matched one by one with the plurality of second limiting protrusions of the position fixing sleeve 8. The position fixing sleeve 8 and the shank 1 are rotatably connected to each other through the sliding fit of the second annular grooves 1-1 and the second limiting protrusions.

[0060] Further, such as Figure 1-Figure 8 As shown, the angle of the protective sleeve 3 and the steering sleeve 4 is adjusted. The adjusting device 5 includes an adjusting screw 5-1, an adjusting nut 5-2 and a gasket 5-3. One of the protective sleeve 3 and the steering sleeve 4 is connected to the adjusting screw 5-1 for anti-rotation, and the other of the steering sleeve 4 and the protective sleeve 3 is connected to the adjusting screw 5-1 for rotation.

[0061] The adjusting nut 5 - 2 is preferably a butterfly nut, which is threadedly connected to the adjusting screw 5 - 1 . The adjusting nut 5 - 2 and the adjusting screw 5 - 1 cooperate with each other to achieve tightness adjustment of the protective sleeve 3 and the steering sleeve 4 .

[0062] The washer 5-3 is mounted on the adjusting screw 5-1 to prevent rotation, and the washer 5-3 has a first protrusion structure. The first protrusion structure is used to prevent the steering sleeve 4 and the protective sleeve 3 from rotating relative to each other when the adjusting nut 5-2 locks the protective sleeve 3 and the steering sleeve 4.

[0063] Furthermore, in some embodiments, the side walls of the head and / or the rod of the adjusting screw 5-1 have multiple side edges formed by the wall thickness protruding outward, one of the protective sleeve 3 and the steering sleeve 4 is provided with a polygonal hole 9 for the multiple side edges to fit, and the other of the protective sleeve 3 and the steering sleeve 4 is provided with a through hole 10 that matches the clearance of the rod of the adjusting screw 5-1.

[0064] Specifically, in this embodiment, the side walls of the head and the rod of the adjusting screw 5-1 have multiple side edges formed by the wall thickness protruding outward. Take a protective sleeve 3 set on the outer periphery of the steering sleeve 4 as an example, the end of the steering sleeve 4 is provided with a polygonal hole 9 along the thickness direction, and the polygonal hole 9 is a countersunk hole; correspondingly, the end of the protective sleeve 3 is provided with a through hole 10 along the thickness direction, and the through hole 10 is colinear with the polygonal hole 9, so that the adjusting screw 5-1 can pass through the steering sleeve 4 and the protective sleeve 3 in sequence.

[0065] When installing the adjusting device 5, the rod of the adjusting screw 5-1 is inserted into the polygonal hole 9 and the through hole 10 in sequence. Since the rod and the head of the adjusting screw 5-1 contact the inner wall of the polygonal hole 9, it is difficult for the adjusting screw 5-1 to rotate relative to the steering sleeve 4. However, since there is a movable gap between the inner wall of the through hole 10 on the protective sleeve 3 and the rod of the adjusting screw 5-1, the protective sleeve 3 can rotate relative to the adjusting screw 5-1.

[0066] Furthermore, a multi-prism hole is provided in the gasket 5-3, and the inner wall of the multi-prism hole in the gasket 5-3 fits closely with the rod wall of the adjusting screw 5-1, so that it is difficult for the gasket 5-3 and the adjusting screw 5-1 to rotate relative to each other. Furthermore, in this embodiment, the first protrusion structure includes first limiting teeth 11 distributed radially, and the outer surface of the steering sleeve 4 is provided with second limiting teeth 12 that mesh with the first limiting teeth 11.

[0067] In other embodiments, the first protrusion structure includes protrusions distributed in a radial or circumferential array. A surface of the other of the protective sleeve 3 and the steering sleeve 4 is provided with a groove for the protrusions to be engaged and positioned.

[0068] The implementation principle of a universal screwdriver in the embodiment of the present application is as follows: during use, the staff member twists the adjustment nut 5-2 to make the adjustment nut 5-2 in a loose state, and then adjusts the gasket 5-3 to separate the first protruding structure from the second protruding structure, at which time the bending adjustment of the shank can be performed. After the shank of the screwdriver is adjusted to a suitable bending angle, that is, after the connection angle between the steering sleeve 4 and the protective sleeve 3 is adjusted to a suitable angle, the staff member reversely twists the adjustment nut 5-2, and the adjustment nut 5-2 is tightened and pushes against the gasket 5-3, so that the first protruding structure is engaged with the second protruding structure, so that the steering sleeve 4 and the protective sleeve 3 are difficult to rotate relative to each other, so that each shank section 2 on the universal screwdriver remains fixed, and the universal adjustment of the screwdriver is achieved.

[0069] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A universal screwdriver, characterized in that: It comprises a knife handle (1) and a knife head, and also comprises: A knife bar connected to the knife handle (1) and the knife head, the knife bar comprising a plurality of knife bar segments (2) which are connected in series and universally connected in sequence; The protection device comprises a plurality of protection sleeves (3) rotatably sleeved on the circumference of the cutter bar segment (2), and a steering sleeve (4) sleeved on the universal joint of the cutter bar segment (2) and connecting two adjacent protection sleeves (3); An adjusting device (5) connected to the protective device adjusts the connection angle between the steering sleeve (4) and the protective sleeve (3) and performs locking connection between the steering sleeve (4) and the protective sleeve (3).

2. A universal screwdriver according to claim 1, characterized in that: The protective sleeve (3) / steering sleeve (4) close to the knife handle (1) is sleeved on the outer periphery of the protective sleeve (3) / steering sleeve (4) far from the knife handle (1), and a notch is left at the end of the protective sleeve (3) and / or the steering sleeve (4) for forming a connection angle between the protective sleeve (3) and the steering sleeve (4).

3. The universal screwdriver according to claim 1, characterized in that: The adjusting device (5) comprises an adjusting screw (5-1), an adjusting nut (5-2) and a gasket (5-3); one of the protective sleeve (3) and the steering sleeve (4) is connected to the adjusting screw (5-1) in a rotationally-resistant manner; and the other of the steering sleeve (4) and the protective sleeve (3) is connected to the adjusting screw (5-1) in a rotationally-resistant manner; The adjusting nut (5-2) is threadedly connected to the adjusting screw (5-1) and is used to loosen or tighten the protective sleeve (3) and the steering sleeve (4); The gasket (5-3) is mounted on the adjusting screw (5-1) in a rotationally resistant manner, and the gasket (5-3) has a first protruding structure for contacting the protective sleeve (3) or the steering sleeve (4). When the adjusting nut (5-2) locks the protective sleeve (3) and the steering sleeve (4), the steering sleeve (4) and the protective sleeve (3) no longer rotate relative to each other.

4. A universal screwdriver according to claim 3, characterized in that: The side wall of the head and / or the stem of the adjusting screw (5-1) has a plurality of side edges formed by outward projection of the wall thickness; one of the protective sleeve (3) and the steering sleeve (4) is provided with a polygonal hole (9) for the plurality of side edges to fit; the other of the protective sleeve (3) and the steering sleeve (4) is provided with a through hole (10) for clearance fit with the stem of the adjusting screw (5-1).

5. The universal screwdriver according to claim 3, characterized in that: The first protruding structure comprises first limiting teeth (11) distributed in a radial shape, and the surface of the other of the protective sleeve (3) and the steering sleeve (4) is provided with second limiting teeth (12) meshingly matched with the first limiting teeth (11).

6. A universal screwdriver according to any one of claims 1 to 5, characterized in that: A universal joint for universally connecting the two adjacent knife bar segments (2) is provided between the two adjacent knife bar segments (2).

7. A universal screwdriver according to claim 6, characterized in that: The universal joint comprises two mutually connected universal joints (6), and the two universal joints (6) are universally connected to the two knife rod sections (2) one by one.

8. A universal screwdriver according to any one of claims 1 to 5, characterized in that: The surface of the shank segment (2) protrudes in the circumferential direction to form a first limiting protrusion (2-3), the protective sleeve (3) has a first annular groove (3-2), and the surface of the first limiting protrusion (2-3) is slidably fitted with the inner wall of the first annular groove (3-2).

9. A universal screwdriver according to any one of claims 1 to 5, characterized in that: The protective device further comprises a position fixing sleeve (8) coaxially rotating on the circumference of the knife handle (1), wherein the position fixing sleeve (8) is coaxially connected to an adjacent protective sleeve (3); The inner wall of the position fixing sleeve (8) is formed with a second limiting protrusion protruding in the circumferential direction, and the circumference of the knife handle (1) is provided with a second annular groove (1-1) for sliding engagement with the second limiting protrusion.

10. A universal screwdriver according to any one of claims 1 to 5, characterized in that: A magnetic engaging groove (2-1) for engaging a cutter head is formed at the end of a cutter rod section (2) located away from the cutter handle (1).

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