A screwdriver with replaceable shaft

Abstract

This invention provides a screwdriver with a replaceable shank, including a handle and a detachable shank mounted on the handle. The handle contains a shank locking mechanism, and the tail end of the handle has a control component for controlling the locking mechanism. The control component for the shank locking mechanism is located at the tail end of the handle, a relatively fixed position that facilitates quick and accurate positioning during use, thus making shank replacement easier. The control component at the tail end of the handle is also relatively inaccessible, reducing the risk of accidental activation and effectively preventing the shank from detaching from the handle in certain situations. The shank is locked to the handle by the shank locking mechanism, improving the reliability of the connection between the shank and the handle.

Description

Technical Field

[0001] This utility model relates to a hand tool, and more specifically, to a screwdriver with a replaceable shank. Background Technology

[0002] Interchangeable-bar screwdrivers are a common type of multi-purpose tool, allowing users to flexibly change the bar size on the same handle to work with screws of corresponding sizes, thus reducing the number of different tool types required. Most existing interchangeable-bar screwdrivers use a direct plug-and-play connection, relying on an interference fit to ensure connection strength. However, over time, wear or material aging can lead to a loose fit between the bar and handle, resulting in insecure locking and the bar easily falling off. To address these issues, some suppliers have continued to improve the design. For example, utility model patent CN212096127U discloses an interchangeable-bar screwdriver. This utility model allows locking and unlocking of the handle and detachable bar by pressing a locking piece on the handle's circumference. However, the locking piece is located on the handle's circumference, often requiring the handle to be rotated to locate it, and is prone to accidental activation, affecting ease of use and safety. Utility Model Content

[0003] Some existing screwdrivers with interchangeable tool holders have problems with unreliable connection between the tool holder and the handle, and some lack convenience and safety in use. To overcome these defects, this utility model provides a screwdriver with an interchangeable tool holder, which can not only achieve a reliable connection between the tool holder and the handle, but also allow the tool holder to be replaced by pressing the end of the handle, thus ensuring convenience and safety in use.

[0004] The technical solution of this utility model is: a screwdriver with a replaceable shank, including a handle and a detachable shank mounted on the handle. A shank locking mechanism is provided inside the handle, and a control component for controlling the shank locking mechanism is provided at the tail end of the handle. The shank locking mechanism inside the handle locks the shank to the handle after connection. Compared to some connection methods that rely solely on interference fit, this locking structure better resists the effects of wear and material aging during long-term use, ensuring a reliable connection between the shank and the handle, and improving the overall stability and durability of the screwdriver. This utility model places the control component at the tail end of the handle, which is more fixed and clearly defined compared to the traditional method of placing it on the circumference of the handle. When the user needs to replace the shank, there is no need to search for the operating part in the complex area around the handle; the user can more quickly and accurately locate and operate the control component, significantly improving the convenience of shank replacement. Furthermore, the control component is located at the tail end of the handle, making it less likely to be accidentally touched during normal use of the screwdriver. This is especially important in work scenarios with high safety requirements, effectively avoiding the risk of the shank falling off the handle due to accidental contact and ensuring user safety.

[0005] Preferably, the tool holder locking mechanism includes a locking block and a locking block return spring. The locking block is slidably connected within the handle and driven by a control component. The locking block return spring is located between the locking block and the handle. A clutch locking structure is provided between the locking block and the tail end of the tool holder. The locking block can slide within the handle driven by the control component, realizing the locking and unlocking operations of the tool holder. This design can precisely control the connection state of the tool holder. Simultaneously, the locking block return spring ensures that after the control component removes the driving force, the locking block automatically returns to its initial locked position, maintaining the locked connection between the tool holder and the handle without manual intervention by the user, improving ease of use and connection reliability. Even with frequent tool holder changes, the locking block return spring ensures timely reset of the locking block, guaranteeing a stable connection of the tool holder.

[0006] Preferably, the clutch locking structure includes a groove on the locking block and a protrusion on the tool holder, the protrusion being shaped to match the groove. This clutch locking structure, where the groove on the locking block and the protrusion on the tool holder are shaped to match, is simple in structure and easy to manufacture. When the tool holder is inserted into the handle, the protrusion accurately engages with the groove, forming a tight fit. This effectively prevents axial or radial movement of the tool holder during use, thus providing a stable connection between the tool holder and the handle. This ensures that the tool holder will not loosen or fall off during screw tightening, guaranteeing operational stability and reliability.

[0007] Alternatively, the clutch locking structure includes a protrusion on the locking block and a slot on the tool holder, the protrusion and the slot being shaped to fit each other. The protrusion can also be on the locking block and the slot on the tool holder, which can also achieve locking of the tool holder on the handle.

[0008] Preferably, the control component has a driving ramp at its front end, and the locking block has a force-receiving ramp that engages with the driving ramp. The engagement of the driving ramp at the front end of the control component with the force-receiving ramp on the locking block effectively converts the pressure applied by the control component into a driving force that propels the locking block to slide. Simultaneously, the engagement between the ramps ensures the stability of force transmission, making the control component's drive on the locking block smoother and more reliable, thus improving the sensitivity and reliability of the tool holder locking mechanism.

[0009] Preferably, an anti-rotation structure is provided between the control component and the handle. This anti-rotation structure ensures that the control component can only move axially within the handle and will not rotate. This structure guarantees the consistency and accuracy of each operation of the control component, improving the overall user experience and reliability of the screwdriver.

[0010] Preferably, a control component return spring is provided between the control component and the handle. This return spring allows the control component to automatically return to its initial position after each press, facilitating the next operation. This not only improves the efficiency of changing the tool holder but also ensures that the control component will not remain in the unlocked position due to unforeseen circumstances during normal screwdriver use, thus preventing the tool holder from accidentally falling off and enhancing safety during use.

[0011] Preferably, the tool holder is a regular polygon. The tool holder and the handle must have a non-circular mating surface to ensure torque transmission between them. This ensures that the torque applied by the handle during screw tightening is effectively transmitted to the tool holder, allowing it to stably rotate the screw and preventing problems such as screw slippage or incomplete tightening caused by poor torque transmission.

[0012] Preferably, the tool holder surface has a plastic shell. The plastic shell protects the tool holder surface, providing insulation and allowing for safe live tool holder replacement.

[0013] Preferably, the handle is provided with an insulating layer. This insulating layer provides an important safety guarantee for the user, enabling operation while the circuit is live and reducing the risk of electric shock during operation, thus ensuring the user's personal safety.

[0014] The beneficial effects of this utility model are:

[0015] Convenient to use. In this invention, the control component for the locking mechanism of the screwdriver handle is located at the end of the handle, which is relatively fixed in position. This makes it easier to quickly locate the operating position of the control component during use, thus facilitating the screwdriver handle replacement operation.

[0016] Safer to use. The control component of the tool holder locking mechanism in this invention is located at the end of the handle, which is relatively difficult to access. It is less likely to be accidentally activated during use, and can effectively eliminate the risk of the tool holder falling off the handle due to accidental activation in certain scenarios.

[0017] The connection between the tool holder and the handle is more reliable. In this invention, the tool holder and handle are locked together by a tool holder locking mechanism, which improves the reliability of the connection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0019] Figure 2 This is a schematic diagram of the disassembly structure of this utility model.

[0020] Figure 3 This is a schematic diagram of one structure of the tool holder locking mechanism in this utility model.

[0021] Figure 4 This is a schematic diagram showing one possible working state between the tool holder locking mechanism and the tool holder in this utility model.

[0022] Figure 5 This is a schematic diagram of a cooperative structure between the tool holder locking mechanism and the tool holder in this utility model.

[0023] Figure 6 This is a front view of the present utility model.

[0024] Figure 7 This is a cross-sectional view of the present invention.

[0025] In the diagram, 1-handle, 101-inner core, 102-plastic shell, 103-insulating layer, 2-tool bar, 201-protrusion, 202-plastic shell, 3-tool bar locking mechanism, 301-control component, 3011-drive inclined surface, 3012-control component return spring, 3013-pressure cap, 3014-protruding rib, 302-locking block, 3021-slot, 3022-force-bearing inclined surface, 303-locking block return spring. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1:

[0028] like Figures 1 to 7As shown, a screwdriver with a replaceable shank includes a handle 1 and a detachable shank 2. The handle 1 has a socket at its front end, into which the shank 2 is inserted with a slight interference fit, allowing the shank 2 to be mounted on the handle 1. The handle 1 includes an inner core 101 and a plastic outer shell 102. The front and rear ends of the plastic outer shell 102 are axially connected. The middle and rear parts of the plastic outer shell 102 have cavities that can accommodate the inner core 101. The inner core 101 is inserted into the cavity and is radially, axially, and circumferentially limited by the plastic outer shell 102. The handle 1 has a shank locking mechanism 3, which includes a control element 301, a locking block 302, and a locking block return spring 303. The cross-section of the control element 301 is cross-shaped, and the rear end of the control element 301 has a pressure cap 3013. The pressure cap 3013 protrudes from the rear end of the handle 1 to receive pressure and introduce driving force. The inner core 101 of the handle 1 has a control component groove adapted to the control component 301 and a locking block groove adapted to the locking block 302. The control component 301 is installed in the control component groove, thereby slidingly connected to the handle 1 along the axial direction for controlling the tool holder locking mechanism 3. Since the cross-section of the control component 301 is not circular, after the control component 301 and the control component groove are engaged, an anti-rotation structure is formed between the control component 301 and the handle 1, ensuring that the control component 301 only moves axially relative to the handle 1, while being positioned circumferentially. The control component 301 also has a raised rib 3014, which has an abutting surface facing the tail end of the handle 1, while the inner core 101 has some limiting surfaces facing the front end of the handle 1. The abutting surface of the raised rib 3014 abuts against the limiting surface of the inner core 101, forming a limiting structure for the control component 301, which can prevent the control component 301 from coming off the tail end of the handle 1.

[0029] The locking block 302 is slidably connected to the locking block groove on the handle 1 and moves radially driven by the control member 301. The locking block return spring 303 is located between the locking block 302 and the handle 1. A clutch locking structure is provided between the locking block 302 and the tail end of the tool bar 2. In this embodiment, the clutch locking structure includes a slot 3021 and a protrusion 201. The slot 3021 is provided on the locking block 302, and the protrusion 201 is provided on the tool bar 2. The protrusion 201 and the slot 3021 are adapted to each other in shape. The front end of the control member 301 is provided with a driving inclined surface 3011, and the locking block 302 is provided with a force-receiving inclined surface 3022 that fits against the driving inclined surface 3011. A control member return spring 3012 is provided between the control member 301 and the handle 1. The control member return spring 3012 provides a spring force opposite to the pressing direction of the control member 301. The cross-section of the tool holder 2 is a regular hexagon, and correspondingly, the insertion port at the front end of the handle 1 is also a regular hexagon. The non-circular mating surfaces between the tool holder 2 and the handle 1 constitute a torque transmission structure. A plastic shell 202 is wrapped around the surface of the tool holder 2 using a rubber-coating injection molding process. This increases friction, facilitating insertion and removal of the tool holder 2, and also provides insulation, improving safety during use. An insulating layer 103, made of rubber, is also provided outside the handle 1, and is wrapped around the plastic shell 102 using a rubber-coating injection molding process.

[0030] When the tool holder needs to be replaced, the user does not need to search for the operating part around the handle 1 like with a traditional screwdriver. Instead, the user directly presses the pressure cap 3013 at the end of the handle 1 with their thumb. This causes the driving inclined surface 3011 at the front end of the control component 301 to push the force-bearing inclined surface 3022 on the locking block 302. This causes the locking block 302 to overcome the elastic force of the locking block return spring 303 and move radially along the locking block groove inside the handle 1. At this time, the protrusion 201 separates from the slot 3021, the tool holder 2 is unlocked, and the user can easily pull out the old tool holder 2. Then, a new tool holder of the appropriate size is inserted into the handle 1. After the new tool holder 2 is inserted into place, the control component 301 is released. The control component return spring 3012 pushes the control component 301 back to its initial position. The locking block 302 moves back to its original position under the action of the locking block return spring 303. The protrusion 201 at the end of the tool holder 2 is once again engaged in the slot 3021 of the locking block 302, completing the locking of the tool holder 2. When using a screwdriver to tighten screws, the screwdriver handle 2 and the handle 1 are tightly connected via a torque transmission structure, and the screwdriver handle locking mechanism 3 ensures a reliable connection between the two. Users can confidently apply torque without worrying about the screwdriver handle 2 accidentally falling off. Simultaneously, the insulating layer 103 on the outside of the handle 1 and the plastic shell 202 on the surface of the screwdriver handle 2 provide excellent insulation protection, ensuring user safety even in scenarios where there is a possibility of contact with a weak current.

[0031] Example 2:

[0032] A screwdriver with a replaceable shank includes a handle 1 and a detachable shank 2. The handle 1 has a socket at its front end, and the shank 2 is inserted into the socket with a slight interference fit, so that the shank 2 is mounted on the handle 1. The handle 1 includes an inner core 101 and a plastic shell 102. The front and rear ends of the plastic shell 102 are axially connected. The middle and rear parts of the plastic shell 102 have cavities that can accommodate the inner core 101. The inner core 101 is inserted into the cavity and is limited radially, axially, and circumferentially by the plastic shell 102. The handle 1 is provided with a shank locking mechanism 3. The shank locking mechanism 3 includes a control element 301, a locking block 302, and a locking block return spring 303. Unlike embodiment 1, in this embodiment, the cross-section of the control element 301 is torch-shaped, and the rear end of the control element 301 has a pressure cap 3013. The pressure cap 3013 is exposed at the rear end of the handle 1 to receive pressure and introduce driving force. The inner core 101 of the handle 1 has a control component groove adapted to the control component 301 and a locking block groove adapted to the locking block 302. The control component 301 is installed in the control component groove, thereby slidingly connected to the handle 1 along the axial direction for controlling the tool holder locking mechanism 3. Since the cross-section of the control component 301 is not circular, after the control component 301 and the control component groove are engaged, an anti-rotation structure is formed between the control component 301 and the handle 1, ensuring that the control component 301 only moves axially relative to the handle 1, while being positioned circumferentially. The control component 301 also has a raised rib 3014, which has an abutting surface facing the tail end of the handle 1, while the inner core 101 has some limiting surfaces facing the front end of the handle 1. The abutting surface of the raised rib 3014 abuts against the limiting surface of the inner core 101, forming a limiting structure for the control component 301, which can prevent the control component 301 from coming off the tail end of the handle 1.

[0033] The locking block 302 is slidably connected to the locking block groove on the handle 1 and moves radially driven by the control element 301. The locking block return spring 303 is located between the locking block 302 and the handle 1. A clutch locking structure is provided between the locking block 302 and the tail end of the tool bar 2. Unlike embodiment 1, in this embodiment, the protrusion is provided on the locking block 302, and the slot is provided on the tool bar 2. The protrusion 201 and the slot 3021 are adapted in shape. The front end of the control element 301 is provided with a driving inclined surface 3011, and the locking block 302 is provided with a force-receiving inclined surface 3022 that fits against the driving inclined surface 3011. A control element return spring 3012 is provided between the control element 301 and the handle 1. The control element return spring 3012 provides a spring force opposite to the pressing direction of the control element 301. The cross section of the tool bar 2 is a regular hexagon. Correspondingly, the front end of the handle 1 is also a regular hexagon. The non-circular mating surfaces between the tool bar 2 and the handle 1 constitute a torque transmission structure. The surface of the tool holder 2 is coated with a plastic shell 202 using a rubber injection molding process. This increases friction, facilitating insertion and removal of the tool holder 2, and also provides insulation, improving safety during use. The handle 1 is also provided with an insulating layer 103, which is made of rubber and is coated onto the plastic shell 102 using a rubber injection molding process. The rest is the same as in Embodiment 1.

[0034] When it is necessary to replace the tool holder, the user does not need to search for the operating part around the handle 1 like with a traditional screwdriver. Instead, the user directly presses the pressure cap 3013 at the end of the handle 1 with their thumb. This causes the driving inclined surface 3011 at the front end of the control component 301 to push the force-receiving inclined surface 3022 on the locking block 302. This causes the locking block 302 to overcome the elastic force of the locking block return spring 303 and move radially along the locking block groove inside the handle 1. At this time, the protrusion separates from the slot, the tool holder 2 is unlocked, and the user can easily pull out the old tool holder 2. Then, a new tool holder of the appropriate size is inserted into the handle 1. After the new tool holder 2 is inserted into place, the control component 301 is released. The control component return spring 3012 pushes the control component 301 back to its initial position. The locking block 302 moves and resets under the action of the locking block return spring 303, and the protrusion re-engages into the slot, completing the locking of the tool holder 2. When using a screwdriver to tighten screws, the screwdriver handle 2 and the handle 1 are tightly connected via a torque transmission structure, and the screwdriver handle locking mechanism 3 ensures a reliable connection between the two. Users can confidently apply torque without worrying about the screwdriver handle 2 accidentally falling off. Simultaneously, the insulating layer 103 on the outside of the handle 1 and the plastic shell 202 on the surface of the screwdriver handle 2 provide excellent insulation protection, ensuring user safety even in scenarios where there is a possibility of contact with a weak current.

[0035] Example 3:

[0036] A screwdriver with a replaceable shank includes a handle 1 and a detachable shank 2. The handle 1 has a socket at its front end, into which the shank 2 is inserted with a slight interference fit, allowing the shank 2 to be mounted on the handle 1. The handle 1 includes an inner core 101 and a plastic outer shell 102. The front and rear ends of the plastic outer shell 102 are axially connected. The middle and rear parts of the plastic outer shell 102 have cavities that can accommodate the inner core 101. The inner core 101 is inserted into the cavity and is radially, axially, and circumferentially limited by the plastic outer shell 102. The handle 1 has a shank locking mechanism 3, which includes a control element 301, a locking block 302, and a locking block return spring 303. The control element 301 has a cross-shaped cross section, and the rear end of the control element 301 has a pressure cap 3013. The pressure cap 3013 protrudes from the rear end of the handle 1 to receive pressure and introduce driving force. The inner core 101 of the handle 1 has a control component groove adapted to the control component 301 and a locking block groove adapted to the locking block 302. The control component 301 is installed in the control component groove, thereby slidingly connected to the handle 1 along the axial direction for controlling the tool holder locking mechanism 3. Since the cross-section of the control component 301 is not circular, after the control component 301 and the control component groove are engaged, an anti-rotation structure is formed between the control component 301 and the handle 1, ensuring that the control component 301 only moves axially relative to the handle 1, while being positioned circumferentially. The control component 301 also has a raised rib 3014, which has an abutting surface facing the tail end of the handle 1, while the inner core 101 has some limiting surfaces facing the front end of the handle 1. The abutting surface of the raised rib 3014 abuts against the limiting surface of the inner core 101, forming a limiting structure for the control component 301, which can prevent the control component 301 from coming off the tail end of the handle 1.

[0037] The locking block 302 is slidably connected to the locking block groove on the handle 1 and moves radially driven by the control member 301. The locking block return spring 303 is located between the locking block 302 and the handle 1. A clutch locking structure is provided between the locking block 302 and the tail end of the tool bar 2. In this embodiment, the clutch locking structure includes a slot 3021 and a protrusion 201. The slot 3021 is provided on the locking block 302, and the protrusion 201 is provided on the tool bar 2. The protrusion 201 and the slot 3021 are adapted to each other in shape. The front end of the control member 301 is provided with a driving inclined surface 3011, and the locking block 302 is provided with a force-receiving inclined surface 3022 that fits against the driving inclined surface 3011. A control member return spring 3012 is provided between the control member 301 and the handle 1. The control member return spring 3012 provides a spring force opposite to the pressing direction of the control member 301. Unlike Embodiment 1, in this embodiment, the cross-section of the tool holder 2 is square, and correspondingly, the insertion port at the front end of the handle 1 is also square. The non-circular mating surfaces between the tool holder 2 and the handle 1 constitute a torque transmission structure. A plastic shell 202 is wrapped around the surface of the tool holder 2 using a rubber-coating injection molding process. This increases friction, facilitating insertion and removal of the tool holder 2, and also provides insulation, improving safety during use. An insulating layer 103, made of rubber, is also provided on the outside of the handle 1, and is wrapped around the plastic shell 102 using a rubber-coating injection molding process. The rest is the same as in Embodiment 1.

[0038] When the tool holder needs to be replaced, the user does not need to search for the operating part around the handle 1 like with a traditional screwdriver. Instead, the user directly presses the pressure cap 3013 at the end of the handle 1 with their thumb. This causes the driving inclined surface 3011 at the front end of the control component 301 to push the force-bearing inclined surface 3022 on the locking block 302. This causes the locking block 302 to overcome the elastic force of the locking block return spring 303 and move radially along the locking block groove inside the handle 1. At this time, the protrusion 201 separates from the slot 3021, the tool holder 2 is unlocked, and the user can easily pull out the old tool holder 2. Then, a new tool holder of the appropriate size is inserted into the handle 1. After the new tool holder 2 is inserted into place, the control component 301 is released. The control component return spring 3012 pushes the control component 301 back to its initial position. The locking block 302 moves back to its original position under the action of the locking block return spring 303. The protrusion 201 at the end of the tool holder 2 is once again engaged in the slot 3021 of the locking block 302, completing the locking of the tool holder 2. When using a screwdriver to tighten screws, the screwdriver handle 2 and the handle 1 are tightly connected via a torque transmission structure, and the screwdriver handle locking mechanism 3 ensures a reliable connection between the two. Users can confidently apply torque without worrying about the screwdriver handle 2 accidentally falling off. Simultaneously, the insulating layer 103 on the outside of the handle 1 and the plastic shell 202 on the surface of the screwdriver handle 2 provide excellent insulation protection, ensuring user safety even in scenarios where there is a possibility of contact with a weak current.

[0039] Example 4:

[0040] A screwdriver with a replaceable shank includes a handle 1 and a detachable shank 2. The handle 1 has a socket at its front end, into which the shank 2 is inserted with a slight interference fit, allowing the shank 2 to be mounted on the handle 1. The handle 1 includes an inner core 101 and a plastic outer shell 102. The front and rear ends of the plastic outer shell 102 are axially connected. The middle and rear parts of the plastic outer shell 102 have cavities that can accommodate the inner core 101. The inner core 101 is inserted into the cavity and is radially, axially, and circumferentially limited by the plastic outer shell 102. The handle 1 has a shank locking mechanism 3, which includes a control element 301, a locking block 302, and a locking block return spring 303. The control element 301 has a cross-shaped cross section, and the rear end of the control element 301 has a pressure cap 3013. The pressure cap 3013 protrudes from the rear end of the handle 1 to receive pressure and introduce driving force. The inner core 101 of the handle 1 has a control component groove adapted to the control component 301 and a locking block groove adapted to the locking block 302. The control component 301 is installed in the control component groove, thereby slidingly connected to the handle 1 along the axial direction for controlling the tool holder locking mechanism 3. Since the cross-section of the control component 301 is not circular, after the control component 301 and the control component groove are engaged, an anti-rotation structure is formed between the control component 301 and the handle 1, ensuring that the control component 301 only moves axially relative to the handle 1, while being positioned circumferentially. The control component 301 also has a raised rib 3014, which has an abutting surface facing the tail end of the handle 1, while the inner core 101 has some limiting surfaces facing the front end of the handle 1. The abutting surface of the raised rib 3014 abuts against the limiting surface of the inner core 101, forming a limiting structure for the control component 301, which can prevent the control component 301 from coming off the tail end of the handle 1.

[0041] The locking block 302 is slidably connected to the locking block groove on the handle 1 and moves radially driven by the control member 301. The locking block return spring 303 is located between the locking block 302 and the handle 1. A clutch locking structure is provided between the locking block 302 and the tail end of the tool bar 2. In this embodiment, the clutch locking structure includes a slot 3021 and a protrusion 201. The slot 3021 is provided on the locking block 302, and the protrusion 201 is provided on the tool bar 2. The protrusion 201 and the slot 3021 are adapted to each other in shape. The front end of the control member 301 is provided with a driving inclined surface 3011, and the locking block 302 is provided with a force-receiving inclined surface 3022 that fits against the driving inclined surface 3011. A control member return spring 3012 is provided between the control member 301 and the handle 1. The control member return spring 3012 provides a spring force opposite to the pressing direction of the control member 301. Unlike Embodiment 1, the cross-section of the tool holder 2 in this embodiment is elliptical. Correspondingly, the insertion port at the front end of the handle 1 is also elliptical. The non-circular mating surfaces between the tool holder 2 and the handle 1 constitute a torque transmission structure. A plastic shell 202 is wrapped around the surface of the tool holder 2 using a rubber-coating injection molding process. This increases friction, facilitating insertion and removal of the tool holder 2, and also provides insulation, improving safety during use. An insulating layer 103, made of rubber, is also provided on the outside of the handle 1, and is wrapped around the plastic shell 102 using a rubber-coating injection molding process. The rest is the same as in Embodiment 1.

[0042] When the tool holder needs to be replaced, the user does not need to search for the operating part around the handle 1 like with a traditional screwdriver. Instead, the user directly presses the pressure cap 3013 at the end of the handle 1 with their thumb. This causes the driving inclined surface 3011 at the front end of the control component 301 to push the force-bearing inclined surface 3022 on the locking block 302. This causes the locking block 302 to overcome the elastic force of the locking block return spring 303 and move radially along the locking block groove inside the handle 1. At this time, the protrusion 201 separates from the slot 3021, the tool holder 2 is unlocked, and the user can easily pull out the old tool holder 2. Then, a new tool holder of the appropriate size is inserted into the handle 1. After the new tool holder 2 is inserted into place, the control component 301 is released. The control component return spring 3012 pushes the control component 301 back to its initial position. The locking block 302 moves back to its original position under the action of the locking block return spring 303. The protrusion 201 at the end of the tool holder 2 is once again engaged in the slot 3021 of the locking block 302, completing the locking of the tool holder 2. When using a screwdriver to tighten screws, the screwdriver handle 2 and the handle 1 are tightly connected via a torque transmission structure, and the screwdriver handle locking mechanism 3 ensures a reliable connection between the two. Users can confidently apply torque without worrying about the screwdriver handle 2 accidentally falling off. Simultaneously, the insulating layer 103 on the outside of the handle 1 and the plastic shell 202 on the surface of the screwdriver handle 2 provide excellent insulation protection, ensuring user safety even in scenarios where there is a possibility of contact with a weak current.

[0043] Example 5:

[0044] A screwdriver with a replaceable shank includes a handle 1 and a detachable shank 2. The handle 1 has a socket at its front end, into which the shank 2 is inserted with a slight interference fit, allowing the shank 2 to be mounted on the handle 1. The handle 1 includes an inner core 101 and a plastic outer shell 102. The front and rear ends of the plastic outer shell 102 are axially connected. The middle and rear parts of the plastic outer shell 102 have cavities that can accommodate the inner core 101. The inner core 101 is inserted into the cavity and is radially, axially, and circumferentially limited by the plastic outer shell 102. The handle 1 has a shank locking mechanism 3, which includes a control element 301, a locking block 302, and a locking block return spring 303. The control element 301 has a cross-shaped cross section, and the rear end of the control element 301 has a pressure cap 3013. The pressure cap 3013 protrudes from the rear end of the handle 1 to receive pressure and introduce driving force. The inner core 101 of the handle 1 has a control component groove adapted to the control component 301 and a locking block groove adapted to the locking block 302. The control component 301 is installed in the control component groove, thereby slidingly connected to the handle 1 along the axial direction for controlling the tool holder locking mechanism 3. Since the cross-section of the control component 301 is not circular, after the control component 301 and the control component groove are engaged, an anti-rotation structure is formed between the control component 301 and the handle 1, ensuring that the control component 301 only moves axially relative to the handle 1, while being positioned circumferentially. The control component 301 also has a raised rib 3014, which has an abutting surface facing the tail end of the handle 1, while the inner core 101 has some limiting surfaces facing the front end of the handle 1. The abutting surface of the raised rib 3014 abuts against the limiting surface of the inner core 101, forming a limiting structure for the control component 301, which can prevent the control component 301 from coming off the tail end of the handle 1.

[0045] The locking block 302 is slidably connected to the locking block groove on the handle 1 and moves radially driven by the control member 301. The locking block return spring 303 is located between the locking block 302 and the handle 1. A clutch locking structure is provided between the locking block 302 and the tail end of the tool bar 2. In this embodiment, the clutch locking structure includes a slot 3021 and a protrusion 201. The slot 3021 is provided on the locking block 302, and the protrusion 201 is provided on the tool bar 2. The protrusion 201 and the slot 3021 are adapted to each other in shape. The front end of the control member 301 is provided with a driving inclined surface 3011, and the locking block 302 is provided with a force-receiving inclined surface 3022 that fits against the driving inclined surface 3011. A control member return spring 3012 is provided between the control member 301 and the handle 1. The control member return spring 3012 provides a spring force opposite to the pressing direction of the control member 301. Unlike Embodiment 1, in this embodiment, the circumferential surface of the tool holder 2 is evenly distributed with splines. Correspondingly, the inner edge of the insertion port at the front end of the handle 1 is also provided with spline grooves corresponding to the splines. The non-circular mating surfaces between the tool holder 2 and the handle 1 constitute a torque transmission structure. The surface of the tool holder 2 is wrapped with a plastic shell 202 through a rubber injection molding process. This increases friction, making it easier to insert and remove the tool holder 2, and also provides a certain degree of insulation, improving safety during use. An insulating layer 103 is also provided on the outside of the handle 1. The insulating layer 103 is made of rubber and is wrapped around the plastic shell 102 through a rubber injection molding process. The rest is the same as in Embodiment 1.

[0046] When the tool holder needs to be replaced, the user does not need to search for the operating part around the handle 1 like with a traditional screwdriver. Instead, the user directly presses the pressure cap 3013 at the end of the handle 1 with their thumb. This causes the driving inclined surface 3011 at the front end of the control component 301 to push the force-bearing inclined surface 3022 on the locking block 302. This causes the locking block 302 to overcome the elastic force of the locking block return spring 303 and move radially along the locking block groove inside the handle 1. At this time, the protrusion 201 separates from the slot 3021, the tool holder 2 is unlocked, and the user can easily pull out the old tool holder 2. Then, a new tool holder of the appropriate size is inserted into the handle 1. After the new tool holder 2 is inserted into place, the control component 301 is released. The control component return spring 3012 pushes the control component 301 back to its initial position. The locking block 302 moves back to its original position under the action of the locking block return spring 303. The protrusion 201 at the end of the tool holder 2 is once again engaged in the slot 3021 of the locking block 302, completing the locking of the tool holder 2. When using a screwdriver to tighten screws, the screwdriver handle 2 and the handle 1 are tightly connected via a torque transmission structure, and the screwdriver handle locking mechanism 3 ensures a reliable connection between the two. Users can confidently apply torque without worrying about the screwdriver handle 2 accidentally falling off. Simultaneously, the insulating layer 103 on the outside of the handle 1 and the plastic shell 202 on the surface of the screwdriver handle 2 provide excellent insulation protection, ensuring user safety even in scenarios where there is a possibility of contact with a weak current.

Claims

1. A screwdriver with a replaceable shank, comprising a handle (1) and a detachable shank (2) mounted on the handle (1), characterized in that, The handle (1) is equipped with a tool holder locking mechanism (3), and the end of the handle (1) is equipped with a control component (301) for controlling the tool holder locking mechanism (3).

2. The screwdriver with a replaceable shank according to claim 1, characterized in that, The tool holder locking mechanism (3) includes a locking block (302) and a locking block return spring (303). The locking block (302) is slidably connected in the handle (1) and driven by the control component (301). The locking block return spring (303) is located between the locking block (302) and the handle (1). A clutch locking structure is provided between the locking block (302) and the tail end of the tool holder (2).

3. The screwdriver with a replaceable shank according to claim 2, characterized in that, The clutch locking structure includes a slot (3021) on the locking block (302) and a protrusion (201) on the tool bar (2), the protrusion (201) and the slot (3021) being adapted in shape.

4. The screwdriver with a replaceable shank according to claim 2, characterized in that, The clutch locking structure includes a protrusion on the locking block (302) and a slot on the tool bar (2), with the protrusion and the slot being adapted to each other.

5. The screwdriver with a replaceable tool holder according to claim 2, characterized in that the control component... (301) A driving ramp (3011) is provided at the front end, and a force-bearing ramp (3022) is provided on the locking block (302) to fit with the driving ramp (3011).

6. The screwdriver with a replaceable shank according to claim 1, characterized in that, An anti-rotation structure is provided between the control component (301) and the handle (1).

7. The screwdriver with a replaceable shank according to claim 1, characterized in that, A control reset spring (3012) is provided between the control component (301) and the handle (1).

8. The screwdriver with a replaceable shank according to claim 1, characterized in that, The cross-section of the tool holder (2) is a regular polygon or an ellipse.

9. A screwdriver with a replaceable shank according to any one of claims 1 to 8, characterized in that, The surface of the tool holder (2) has a plastic shell (202).

10. A screwdriver with a replaceable shank according to any one of claims 1 to 8, characterized in that, The handle (1) has an insulating layer on the outside.

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