A screwdriver

Abstract

The present application relates to screwdriver technical field, specifically disclose a screwdriver, including connecting cylinder, handle and for installing the extension handle of bit;Handle one end and extension handle one end are detachable connection in connecting cylinder, ring plate is equipped with in connecting cylinder, ring plate is connected with movable ring through spring, handle cover is equipped with first transmission gear, and movable ring and first transmission gear are engaged through connecting mechanism between;Connecting mechanism includes driving gear, first gear set and second gear set can move along the axis of connecting cylinder, and the distance between latter two is greater than the diameter of driving gear;When first gear set or second gear set moves to the end far from ring plate, spring naturally elongates, extension rod is connected with handle;When first gear set or second gear set moves to the end close to ring plate, spring is compressed, extension handle is connected with connecting ring, and the rotation direction of extension handle is opposite to the rotation direction of handle.The present application reduces the possibility of screwdriver falling, improves the use efficiency of screwdriver.

Description

Technical Field

[0001] This invention belongs to the field of screwdriver technology, and particularly relates to a screwdriver. Background Technology

[0002] A screwdriver is a common tool used to tighten screws into place. A screwdriver generally includes a handle and a coaxial bit. When using a screwdriver, you usually need to turn the handle clockwise to tighten the screw, and the tightening process requires a reverse hand operation, that is, loosen the handle and turn your palm counterclockwise to a position where it is easy to apply force. Similarly, when removing a screw, you usually need to turn the handle counterclockwise to remove the screw, and the removal process also requires a reverse hand operation, that is, loosen the handle and turn your palm clockwise to a position where it is easy to apply force.

[0003] Regarding the aforementioned technologies, the inventors discovered that using a conventional screwdriver requires constantly loosening and tightening the hand, resulting in low work efficiency and a risk of dropping the screwdriver. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a screwdriver that does not require reversing the operation, can drive the bit to rotate even when turning in the opposite direction, is easy to operate, and improves the efficiency of use.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A screwdriver includes an extension handle, a connecting sleeve, and a handle; the extension handle includes a connecting disc disposed within the connecting sleeve and an extension handle body for mounting the screwdriver tip;

[0007] The connecting cylinder is provided with an annular plate, which divides the interior of the connecting cylinder into a control groove and an installation groove for the connecting disc to move along the axis of the connecting cylinder.

[0008] The handle includes a handle body and a connecting post coaxially connected. The connecting post is coaxially sleeved with a first transmission gear, a connecting ring, and a second transmission gear fixedly connected to the connecting ring. A spring is placed between the second transmission gear and the ring plate, and the second transmission gear is connected to the ring plate through the spring. The connecting post, the first transmission gear, the connecting ring, and the second transmission gear are all located in the control groove.

[0009] The end face of the connecting post away from the handle body is provided with several connecting protrusions, and the side of the connecting plate away from the extension handle body is provided with several connecting grooves for the connecting protrusions to engage; the side of the connecting ring near the ring plate is provided with several fixing protrusions.

[0010] When the spring is in its natural state, the connecting protrusion engages with the connecting groove, and there is a distance between the fixed protrusion and the connecting groove; when the spring is in its compressed state, the fixed protrusion engages with the connecting groove, and there is a distance between the connecting disc and the ring plate.

[0011] At least one connecting mechanism is provided between the first transmission gear and the second transmission gear. The connecting mechanism includes a driving gear, a first gear set, and a second gear set. The driving gear meshes with the first transmission gear and is rotatably connected to the connecting column. The distance between the first gear set and the second gear set is greater than the diameter of the driving gear. With the extension shank pointing vertically upward as a reference, the first gear set is located to the right of the driving gear.

[0012] The driving gear meshes with the second transmission gear through a first gear set or a second gear set, and both the first gear set and the second gear set include an even number of driven gears;

[0013] The connecting cylinder sidewall is coaxially rotatably connected to a steering ring for driving the first gear set and the second gear set to rotate along the circumference of the connecting column; the inner wall of the steering ring is provided with a first movable groove for the first gear set to move linearly along the axial direction of the connecting column and a second movable groove for the second gear set to move linearly along the axial direction of the connecting column.

[0014] Furthermore, a limiting ring is coaxially and fixedly connected between the connecting ring and the second transmission gear, and the second transmission gear is connected to the spring through the limiting ring.

[0015] Furthermore, the inner wall of the steering ring is connected to a connecting plate that is fixedly connected to the connecting cylinder, and the connecting plate is provided with two smooth hemispherical limiting protrusions, and the inner wall of the steering ring is provided with a limiting groove for the limiting protrusions to engage.

[0016] When the limiting groove engages with one limiting protrusion, the driving gear is connected to the first gear set; when the limiting groove engages with another limiting protrusion, the driving gear is connected to the second gear set.

[0017] Furthermore, the outer circumferential surface of the steering ring is provided with anti-slip texture.

[0018] Furthermore, the connecting protrusion is a magnetic connecting protrusion, and a magnetic element is disposed within the connecting groove.

[0019] Furthermore, the extension handle body has an axially formed insertion hole for mounting a screwdriver tip at the end away from the connecting plate. The insertion hole has a regular hexagonal cross-section and a magnet is installed inside the insertion hole.

[0020] Furthermore, the connecting cylinder is formed by two oppositely arranged shells through the engagement of a snap fastener and a slot, and the two shells are symmetrical about the axis of the connecting cylinder.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] 1. In this invention, when a screwdriver is in use, rotating the steering ring connects the driving gear with the first gear set, and the driving gear meshes with a driven gear in the first gear set. By pressing down on the connecting sleeve and rotating the handle body, the screw can be removed.

[0023] When the handle body is rotated clockwise, the drive gear rotates counterclockwise with the handle body, thereby driving each driven gear in the first gear set to move along the first movable groove to the end near the connecting plate. At this time, the second transmission gear squeezes the spring through the first gear set and puts the spring in a compressed state, the connecting slot engages with the fixed protrusion, and the connecting plate engages with the connecting ring. The extended handle body drives the screwdriver head to rotate counterclockwise with the connecting ring.

[0024] When the handle body is rotated counterclockwise, the drive gear rotates clockwise with the handle body, thereby driving each driven gear in the first gear set to move along the first movable groove to the end away from the connecting plate. At this time, the spring is in the natural state, the connecting slot engages with the connecting protrusion, the connecting plate engages with the connecting post, and the extension handle body drives the screwdriver head to rotate counterclockwise with the connecting post.

[0025] When the steering ring is rotated to connect the drive gear with the second gear set, the drive gear meshes with one of the driven gears in the second gear set. Pressing down on the connecting cylinder and rotating the handle body allows the screw to be installed.

[0026] When the handle body is rotated clockwise, the drive gear rotates counterclockwise with the handle body, thereby driving each driven gear in the second gear set to move along the second movable groove to the end away from the connecting plate. At this time, the spring is in the natural state, the connecting slot engages with the connecting protrusion, and the connecting plate engages with the connecting post. The extension handle body drives the screwdriver head to rotate clockwise with the connecting post.

[0027] When the handle body is rotated counterclockwise, the drive gear rotates clockwise with the handle body, thereby driving each driven gear in the second gear set to move along the second movable groove to the end near the connecting plate. At this time, the movable ring squeezes the spring through the second gear set and puts the spring in a compressed state, the connecting slot engages with the fixed protrusion, and the connecting plate engages with the connecting ring. The extended handle body drives the screwdriver head to rotate clockwise with the connecting ring.

[0028] Therefore, when the steering ring is rotated to connect the drive gear with the first gear set, the extension handle body will rotate the screwdriver head counterclockwise regardless of whether the handle body is rotated clockwise or counterclockwise, which is the state of removing the screw; when the steering ring is rotated to connect the drive gear with the second gear set, the extension handle body will rotate the screwdriver head clockwise regardless of whether the handle body is rotated clockwise or counterclockwise, which is the state of installing the screw.

[0029] Thus, when using the screwdriver of the present invention, the operator only needs to rotate the steering ring to adjust the screwdriver to the tightening or loosening state according to the specific situation, and press the connecting cylinder to rotate the handle body. Moreover, the operator does not need to release the handle body when transferring the screwdriver. Rotating the handle body in the opposite direction when transferring the screwdriver can also keep the screwdriver in the tightening or loosening state, which reduces the possibility of the screwdriver falling out of the hand and improves the efficiency of screwdriver use.

[0030] 2. By setting a limit ring, the possibility of the connecting ring extending excessively is reduced.

[0031] 3. By setting a connecting plate, a limiting protrusion, and a limiting groove, the position of the steering ring is fixed after rotation.

[0032] 4. By setting anti-slip texture, the friction between the operator's fingers and the steering ring is enhanced, making it easier for the operator to turn the steering ring.

[0033] 5. By setting up a magnetic connection protrusion and a magnetic component located in the connection groove, the cooperation between the magnetic connection protrusion and the magnetic component provides an external force for the connecting plate to move toward the ring plate, which increases the speed of connection between the connecting plate and the connecting column, thereby reducing the possibility of the connecting column spinning freely due to the slow reset of the connecting plate, which affects efficiency.

[0034] 6. By setting a hexagonal insertion hole and a magnet located inside the insertion hole, the possibility of the screwdriver tip falling off the extension handle body is reduced.

[0035] 7. By setting two opposing housings, which are connected by a snap-fit ​​and a slot to form a connecting cylinder, the ease of disassembling the connecting cylinder is improved, making it easier to install, inspect, repair, and replace the internal parts of the connecting cylinder. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of a screwdriver according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the internal structure of the connecting cylinder in an embodiment of the present invention;

[0038] Figure 3 This is a diagram showing the positional relationship between the driving gear and the first gear set and the second gear set in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the movable ring in an embodiment of the present invention;

[0040] Figure 5 This is a diagram showing the positional relationship between the movable ring, the connecting disc, and the connecting post when the spring is in its natural state, according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached drawings: 1. Extension handle; 11. Extension handle body; 12. Connecting disc; 2. Connecting cylinder; 21. Housing; 22. Mounting groove; 23. Control groove; 24. Connecting plate; 25. Limiting protrusion; 3. Handle; 31. Handle body; 32. Connecting post; 33. First transmission gear; 4. Steering ring; 41. First movable groove; 42. Second movable groove; 5. Movable ring; 51. Limiting ring; 52. Connecting ring; 53. Second transmission gear; 6. Spring; 7. Driving gear; 9. First gear set; 91. First driven gear; 92. Second driven gear; 10. Second gear set; 101. Third driven gear; 102. Fourth driven gear. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-5 The specific content of this invention will be explained in further detail below.

[0043] This invention discloses a screwdriver, with reference to Figure 1 , Figure 2 and Figure 3 The screwdriver includes a connecting sleeve 2, a handle 3, and an extension handle 1 for fixing the screwdriver tip. The extension handle 1 is detachably connected to the handle 3 coaxially via the connecting sleeve 2. The extension handle 1 includes an extension handle body 11 and a connecting plate 12. The extension handle body 11 is coaxially and fixedly connected to the connecting plate 12. An insertion hole for mounting the screwdriver tip is axially opened at the end of the extension handle body 11 away from the connecting plate 12. The insertion hole has a regular hexagonal cross-section and a magnet is installed inside the insertion hole.

[0044] The connecting cylinder 2 is formed by two opposing housings 21 engaged by a snap-fit ​​and a slot, with the two housings 21 symmetrical about the axis of the connecting cylinder 2. The connecting plate 12 is disposed inside the connecting cylinder 2, and the extension handle body 11 coaxially passes through the connecting cylinder 2. A ring plate is coaxially disposed inside the connecting cylinder 2, dividing the interior of the connecting cylinder 2 into an installation groove 22 for the connecting plate 12 to move along the axis of the connecting cylinder 2 and a control groove 23.

[0045] The handle 3 includes a handle body 31 and a connecting post 32. The handle body 31 and the connecting post 32 are coaxially and fixedly connected. A first transmission gear 33 is coaxially sleeved on one end of the connecting post 32 near the handle body 31. The first transmission gear 33 is fixedly connected to the connecting post 32. The handle body 31 is located in the control groove 23, and a slot is formed between the first transmission gear 33 and the handle body 31 for the housing 21 to engage.

[0046] The end face of the connecting post 32 away from the handle body 31 is provided with several magnetic connecting protrusions, and the side of the connecting plate 12 away from the extension handle body 11 is provided with several connecting grooves for the connecting protrusions to engage. Magnetic components are provided in the connecting grooves. When the connecting protrusions engage with the connecting grooves, the connecting plate 12 abuts against the ring plate.

[0047] Reference Figure 3 , Figure 4 and Figure 5 A movable ring 5 and a spring 6 are fitted onto the end of the connecting post 32 away from the handle body 31. The spring 6 is located between the movable ring 5 and the ring plate. The movable ring 5 includes a limiting ring 51, a connecting ring 52, and a second transmission gear 53. The limiting ring 51, the connecting ring 52, and the second transmission gear 53 are integrally formed, and the limiting ring 51 is located between the connecting ring 52 and the second transmission gear 53.

[0048] The limiting ring 51 is connected to the ring plate via a spring 6, which is positioned between the limiting ring 51 and the ring plate. The side of the limiting ring 51 away from the spring 6 is connected to the second transmission gear 53, and the other side is connected to the connecting ring 52. The outer diameter of the limiting ring 51 is larger than the diameter of the spring 6. The connecting ring 52, away from the limiting ring 51, has several fixed protrusions that engage with the connecting groove, and the outer diameter of the connecting ring 52 is smaller than the inner diameter of the ring plate. When the spring 6 is in its natural state, the connecting protrusions engage with the connecting groove, and there is a distance between the fixed protrusions and the connecting groove. When the spring 6 is in a compressed state, the connecting ring 52 protrudes from the ring plate, the fixed protrusions engage with the connecting groove, and there is a distance between the connecting disc 12 and the ring plate.

[0049] At least one connecting mechanism is also provided within the control slot 23. In this embodiment, there are two connecting mechanisms, which are symmetrically arranged about the axis of the connecting column 32. The connecting mechanism includes a drive gear 7, a first gear set 9, and a second gear set 10. The drive gear 7 meshes with the first transmission gear 33 and is rotatably connected to the connecting column 32 via a rotating shaft. The distance between the first gear set 9 and the second gear set 10 is greater than the diameter of the drive gear 7, meaning that when the drive gear 7 is connected to the first gear set 9, there is a distance between it and the second gear set 10. With the extension handle 1 vertically upward as a reference, the first gear set 9 is located to the right of the drive gear 7.

[0050] A steering ring 4 is rotatably connected to the side wall of the connecting cylinder 2 to drive the first gear set 9 and the second gear set 10 to rotate along the circumference of the connecting column 32. The two ends of the steering ring 4 are rotatably connected to the connecting cylinder 2 coaxially through rotating grooves, and the connecting cylinder 2 is provided with clearance grooves for the first gear set 9 and the second gear set 10 to rotate. Both the first gear set 9 and the second gear set 10 include an even number of driven gears. In this embodiment, the number of driven gears in both the first gear set 9 and the second gear set 10 is two.

[0051] The first gear set 9 includes a first driven gear 91 and a second driven gear 92 arranged along the axis of the connecting post 32, with the second driven gear 92 located between the first driven gear 91 and the second transmission gear 53. Similarly, the second gear set 10 includes a third driven gear 101 and a fourth driven gear 102 arranged along the axis of the connecting post 32, with the fourth driven gear 102 located between the third driven gear 101 and the second transmission gear 53.

[0052] The inner wall of the steering ring 4 is provided with a first movable groove 41 for the first driven gear 91 and the second driven gear 92 to move linearly along the axis of the connecting column 32, and a second movable groove 42 for the third driven gear 101 and the fourth driven gear 102 to move linearly along the axis of the connecting column 32.

[0053] When the drive gear 7 meshes with the first driven gear 91, the handle body 31 is rotated clockwise, and the drive gear 7 rotates counterclockwise with the handle body 31, thereby driving the first driven gear 91 and the second driven gear 92 to move along the first movable groove 41 to one end close to the connecting plate 12. At this time, the movable ring 5 squeezes the spring 6 through the first gear set 9 and puts the spring 6 in a compressed state, the connecting groove engages with the fixed protrusion, the connecting plate 12 engages with the connecting ring 52, and the extension handle body 11 drives the screwdriver head to rotate counterclockwise with the connecting ring 52.

[0054] When the handle body 31 is rotated counterclockwise, the drive gear 7 rotates clockwise with the handle body 31, thereby driving the first driven gear 91 and the second driven gear 92 to move along the first movable groove 41 to the end away from the connecting plate 12. At this time, the spring 6 is in the natural state, the connecting slot engages with the connecting protrusion, and the connecting plate 12 engages with the connecting post 32. The extension handle body 11 drives the screwdriver head to rotate counterclockwise with the connecting post 32.

[0055] When the drive gear 7 meshes with the third driven gear 101, the handle body 31 is rotated clockwise, and the drive gear 7 rotates counterclockwise with the handle body 31, thereby driving the third driven gear 101 and the fourth driven gear 102 to move along the second movable groove 42 to the end away from the connecting plate 12. The spring 6 is in the natural state, the connecting slot engages with the connecting protrusion, and the connecting plate 12 engages with the connecting post 32. The extension handle body 11 drives the screwdriver head to rotate clockwise with the connecting post 32.

[0056] When the handle body 31 is rotated counterclockwise, the drive gear 7 rotates clockwise with the handle body 31, thereby driving the third driven gear 101 and the fourth driven gear 102 to move along the second movable groove 42 to one end close to the connecting plate 12. At this time, the movable ring 5 squeezes the spring 6 through the second gear set 10 and puts the spring 6 in a compressed state. The connecting groove engages with the fixed protrusion, and the connecting plate 12 engages with the connecting ring 52. The extension handle body 11 drives the screwdriver head to rotate clockwise with the connecting ring 52.

[0057] Therefore, when the steering ring 4 is rotated so that the driving gear 7 meshes with the first driven gear 91, the extension handle body 11 will rotate the screwdriver head counterclockwise regardless of whether the handle body 31 is rotated clockwise or counterclockwise, which is the state of disassembling the screw; when the steering ring 4 is rotated so that the driving gear 7 meshes with the third driven gear 101, the extension handle body 11 will rotate the screwdriver head clockwise regardless of whether the handle body 31 is rotated clockwise or counterclockwise, which is the state of installing the screw.

[0058] Thus, when using the screwdriver of the present invention, the operator only needs to rotate the steering ring 4 to adjust the screwdriver to the tightening or loosening state according to the specific situation, and press the connecting cylinder 2 to rotate the handle body 31. Moreover, the operator does not need to release the handle body 31 when transferring the screwdriver. Rotating the handle body 31 in the opposite direction when transferring the screwdriver can also keep the screwdriver in the tightening or loosening state, which reduces the possibility of the screwdriver falling out of the hand and improves the efficiency of screwdriver use.

[0059] The steering ring 4 is provided with anti-slip texture; a connecting plate 24 is connected to the inner wall of the steering ring 4, and the connecting plate 24 is integrally formed with the connecting cylinder 2. The connecting plate 24 is provided with two smooth hemispherical limiting protrusions 25, and a limiting groove is provided on the inner wall of the steering ring 4 for the limiting protrusions 25 to engage. When the limiting groove engages with one limiting protrusion 25, the driving gear 7 meshes with the first driven gear 91; when the limiting groove engages with the other limiting protrusion 25, the driving gear 7 meshes with the third driven gear 101. The setting of the limiting protrusions 25 and the limiting groove realizes the fixation of the position of the steering ring 4 after rotation.

[0060] The implementation principle of the screwdriver of the present invention is as follows: Before use, rotate the steering ring 4 to adjust the screwdriver to the state of tightening or loosening screws. When using, the operator can hold the connecting cylinder 2 with one hand and rotate the handle body 31 with the other hand.

[0061] When the operator rotates the steering ring 4 to engage the drive gear 7 with the first driven gear 91, the screwdriver is in the state of removing the screw. At this time, rotating the handle body 31 clockwise causes the drive gear 7 to rotate counterclockwise with the handle body 31, thereby driving the first driven gear 91 and the second driven gear 92 to move along the first movable groove 41 to one end close to the connecting plate 12. In this way, the movable ring 5 compresses the spring 6 through the first gear set 9 and puts the spring 6 in a compressed state, the connecting groove engages with the fixed protrusion, and the connecting plate 12 engages with the connecting ring 52. The extended handle body 11 drives the screwdriver head to rotate counterclockwise with the connecting ring 52, thus removing the screw.

[0062] When switching hands, there is no need to release the handle body 31. Rotate the handle body 31 counterclockwise, and the drive gear 7 will rotate clockwise with the handle body 31, thereby driving the first driven gear 91 and the second driven gear 92 to move along the first movable groove 41 to the end away from the connecting plate 12. At this time, the spring 6 is in the natural state, the connecting slot engages with the connecting protrusion, and the connecting plate 12 engages with the connecting post 32. The extension handle body 11 drives the screwdriver head to rotate counterclockwise with the connecting post 32 to continue to remove the screw.

[0063] When the operator rotates the steering ring 4 to engage the drive gear 7 with the third driven gear 101, the handle body 31 is rotated clockwise. The drive gear 7 rotates counterclockwise with the handle body 31, thereby driving the third driven gear 101 and the fourth driven gear 102 to move along the second movable groove 42 to the end away from the connecting plate 12. The spring 6 is in its natural state, the connecting slot engages with the connecting protrusion, and the connecting plate 12 engages with the connecting post 32. The extension handle body 11 drives the screwdriver head to rotate clockwise with the connecting post 32, thus tightening the screw.

[0064] When switching hands, the handle body 31 is rotated counterclockwise, and the drive gear 7 rotates clockwise with the handle body 31, thereby driving the third driven gear 101 and the fourth driven gear 102 to move along the second movable groove 42 to one end close to the connecting plate 12. At this time, the movable ring 5 squeezes the spring 6 through the second gear set 10 and puts the spring 6 in a compressed state. The connecting groove engages with the fixed protrusion, and the connecting plate 12 engages with the connecting ring 52. The extension handle body 11 drives the screwdriver head to rotate clockwise with the connecting ring 52 to continue tightening the screw.

[0065] Thus, whether the handle body 31 is turned clockwise or counterclockwise, the extension handle body 11 will cause the screwdriver head to rotate counterclockwise, which is the state of disassembling the screw; when the steering ring 4 is rotated so that the driving gear 7 meshes with the third driven gear 101, whether the handle body 31 is turned clockwise or counterclockwise, the extension handle body 11 will cause the screwdriver head to rotate clockwise, which is the state of installing the screw.

[0066] When in use, the operator only needs to rotate the steering ring 4 to adjust the screwdriver to the tightening or loosening state according to the specific situation, press the connecting cylinder 2 to rotate the handle body 31, and the operator does not need to release the handle body 31 when transferring the screwdriver. Reverse rotation of the handle body 31 when transferring the screwdriver will also put the screwdriver in the tightening or loosening state.

[0067] In summary, the screwdriver of the present invention can reduce the possibility of the screwdriver falling out of the hand and improve the efficiency of screwdriver use.

Claims

1. A screwdriver characterized by: The utility model relates to a screwdriver handle, including extension handle (1), connecting cylinder (2) and handle (3), extension handle (1) including setting in connecting cylinder (2) connecting disc (12), the extension handle body (11) for installing screwdriver bit, Connecting cylinder (2) is provided with ring plate in, ring plate divides connecting cylinder (2) into control groove (23), installing groove (22) for connecting disc (12) along the axis direction of connecting cylinder (2) activity, Handle (3) including coaxial connection handle body (31) and connecting column (32), connecting column (32) coaxial sleeve has first transmission gear (33), connecting ring (52), with the fixed connection of connecting ring (52) second transmission gear (53), second transmission gear (53) and ring plate between place spring (6), second transmission gear (53) is connected with ring plate through spring (6), and connecting column (32), first transmission gear (33), connecting ring (52), second transmission gear (53) all are located in control groove (23), Connecting column (32) is provided with a plurality of connecting protrusions on the end face away from handle body (31), one side of connecting disc (12) away from extension handle body (11) is provided with a plurality of connecting grooves for clamping the connecting protrusions, and one side of connecting ring (52) close to ring plate is provided with a plurality of fixed protrusions. When spring (6) is in the natural state, the connecting protrusions are clamped with the connecting grooves, and there is a distance between the fixed protrusions and the connecting grooves; when spring (6) is in the compressed state, the fixed protrusions are clamped with the connecting grooves, and there is a distance between the connecting disc (12) and the ring plate. At least one connecting mechanism is provided between the first transmission gear (33) and the second transmission gear (53), the connecting mechanism includes a driving gear (7), a first gear set (9), and a second gear set (10), the driving gear (7) is engaged with the first transmission gear (33) and is perpendicularly connected with the connecting column (32), the distance between the first gear set (9) and the second gear set (10) is greater than the diameter of the driving gear (7), and the first gear set (9) is located on the right side of the driving gear (7) based on the vertical upward position of the extension handle (1). The driving gear (7) is engaged with the second transmission gear (53) through the first gear set (9) or the second gear set (10), and the first gear set (9) and the second gear set (10) each include a plurality of driven gears. The sidewall of the connecting cylinder (2) is coaxially connected with a steering ring (4) for driving the first gear set (9) and the second gear set (10) to rotate along the circumference of the connecting column (32), the inner wall of the steering ring (4) is provided with a first movable groove (41) for the linear motion of the first gear set (9) along the axis of the connecting column (32) and a second movable groove (42) for the linear motion of the second gear set (10) along the axis of the connecting column (32).

2. A screwdriver as claimed in claim 1, characterized in that The connecting ring (52) and the second transmission gear (53) are coaxially fixedly connected with a limiting ring (51), and the second transmission gear (53) is connected with the spring (6) through the limiting ring (51).

3. A screwdriver as claimed in claim 1, characterized in that The inner wall of the steering ring (4) is connected with a connecting plate (24) fixedly connected with the connecting cylinder (2), and two smooth hemispherical limiting protrusions (25) are arranged on the connecting plate (24), and a limiting groove is arranged on the inner wall of the steering ring (4) for clamping the limiting protrusion (25). When the limiting groove is clamped with one limiting protrusion (25), the driving gear (7) is connected with the first gear set (9); when the limiting groove is clamped with the other limiting protrusion (25), the driving gear (7) is connected with the second gear set (10).

4. A screwdriver as claimed in claim 1, characterized in that The outer circumferential surface of the steering ring (4) is provided with anti-skid lines.

5. A screwdriver as claimed in claim 1, characterized in that The connecting protrusion is a magnetic connecting protrusion, and a magnetic member is arranged in the connecting groove.

6. A screwdriver as claimed in claim 1, characterized in that An insertion hole for mounting a screwdriver bit is axially arranged on the end of the elongated handle body (11) away from the connecting disc (12), the cross section of the insertion hole is a regular hexagon, and a magnet is arranged in the insertion hole.

7. A screwdriver according to any one of claims 1-6, characterized in that The connecting cylinder (2) is formed by the cooperation of buckles and clamping grooves of two oppositely arranged shells (21), and the two shells (21) are symmetrical about the axis of the connecting cylinder (2).

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