Power tool

Abstract

The utility model provides a kind of electric tool, comprising: host computer, the host computer includes main control circuit board, starting switch and executing piece, the main control circuit board includes controller, the controller responds to starting switch and drives the executing piece;Extension, one end of the extension is detachably connected to the host computer;And auxiliary control device, the auxiliary control device is connected to the extension, the auxiliary control device and the host computer are spaced apart by the extension at predetermined distance, the auxiliary control device is configured to be able to send control signal to the controller to control the executing piece of the host computer.Auxiliary control device can send control signal to controller to control the host computer, which is beneficial to reduce the overall weight of electric tool, and further facilitate to improve the convenience of use.

Description

Technical Field

[0001] This utility model relates to power tools, specifically to a power tool equipped with a long handle. Background Technology

[0002] Power tools are widely used in daily life, such as electric pruners and electric pruners. Taking electric pruners as an example, although there are many types of electric pruners on the market, their functions are all achieved by connecting the handle switch and the electric pruner together using a wired drive shaft. The wired drive shaft increases the overall weight of the electric pruner and is not conducive to its ease of use. Utility Model Content

[0003] Therefore, this utility model provides an electric tool to solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, the present invention provides an electric tool, comprising: a main unit, the main unit including a main control circuit board, a start switch and an actuator, the main control circuit board including a controller, the controller driving the actuator in response to the start switch; an extension, one end of the extension being detachably connected to the main unit; and an auxiliary control device connected to the extension, the auxiliary control device and the main unit being spaced apart from each other by a preset distance through the extension, the auxiliary control device being configured to send control signals to the controller to control the actuator of the main unit.

[0005] Optionally, both the host and the auxiliary control device include a wireless communication module. The wireless communication module of the host is electrically connected to the controller so that the auxiliary control device can wirelessly send control signals to the controller.

[0006] Optionally, the host also includes a detection module for detecting whether the extension is connected to the host. The detection module is electrically connected to the controller. After the detection module detects that the extension is connected to the host, the controller and the auxiliary control device establish a communication connection.

[0007] Optionally, after the detection module detects that the extension is connected to the host, the electrical connection between the start switch and the controller is disconnected and rendered ineffective.

[0008] Optionally, the host also includes an electronic switch electrically connected to the start switch and the controller. After receiving the electrical signal from the detection module, the controller sends an electrical signal to the electronic switch to switch the electronic switch from the on state to the off state.

[0009] Optionally, the detection module is a micro switch. The host includes a housing with a connection hole and a movable piece disposed inside the housing. The movable piece is rotatably or slidably connected to the housing. The detection module is disposed inside the housing. When the extension is connected to the host, the end of the extension is received in the connection hole and causes the movable piece to rotate or slide, thereby triggering the micro switch.

[0010] Optionally, a connecting assembly is also included, which includes a base, a locking member, and an elastic member. The base is disposed in the connecting hole, the locking member is connected to the extension, and the elastic member is connected to the base. The base is detachably connected to the locking member. The elastic member applies a pushing force to the locking member to push the locking member away from the locked connection position with the base when the locked connection between the base and the locking member is released. When the locking member is connected to the base, it causes the movable piece to rotate or slide, thereby causing the movable piece to trigger the micro switch.

[0011] Optionally, the detection module is a Hall sensor, the host includes a housing, the detection module is disposed inside the housing, the housing is provided with a connection hole, the end of the extension includes a magnet, and when the extension is connected to the host, the end of the extension is received in the connection hole.

[0012] Optionally, the main unit also includes a single-pole double-throw switch and a start switch. The single-pole double-throw switch includes a common terminal, a normally open terminal, and a normally closed terminal. The common terminal and the normally closed terminal are electrically connected to the start switch and the controller, respectively. The main unit includes a housing with a connection hole. When the extension is connected to the main unit, the end of the extension is received in the connection hole and can touch the rocker of the single-pole double-throw switch, causing the single-pole double-throw switch to switch from being connected between the common terminal and the normally closed terminal to being connected between the common terminal and the normally open terminal.

[0013] Optionally, the auxiliary control device is detachably connected to the other end of the extension relative to the main unit. The extension includes a plurality of sub-extensions. Any two adjacent extensions, the sub-extension adjacent to the main unit and the main unit, and the sub-extension adjacent to the auxiliary control device are all detachably connected together by a connecting assembly of the same construction.

[0014] The present invention has the following advantages: the auxiliary control device can send control signals to the controller to control the main unit, which helps to reduce the overall weight of the power tool and thus improves the ease of use. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a perspective view of a power tool according to an embodiment of the present utility model.

[0017] Figure 2 This is a perspective view of the main unit of a power tool according to an embodiment of the present utility model.

[0018] Figure 3 This is a perspective view of an auxiliary control device for a power tool according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the internal structure of a power tool according to an embodiment of the present invention.

[0020] Figure 5 This is a block diagram of an electric tool according to an embodiment of the present utility model.

[0021] Figure 6 for Figure 4 Enlarged view of section A.

[0022] Figure 7 This is an exploded view of the extension according to an embodiment of the present utility model.

[0023] Figure 8 This is an exploded view of the extension portion according to an embodiment of the present invention from another angle.

[0024] Figure 9 This is an exploded view of the connecting component according to an embodiment of the present utility model.

[0025] Figure 10 This is an exploded view of the connecting component according to an embodiment of the present invention.

[0026] Figure 11 This is a cross-sectional view of the connecting component according to an embodiment of the present utility model.

[0027] Figure 12 for Figure 11 Enlarged view of section C.

[0028] Figure 13 This is a perspective view of the movable part of the connecting component according to an embodiment of the present utility model.

[0029] Figure 14 for Figure 9Enlarged view of section B.

[0030] Figure 15 This is a partial cross-sectional view of a power tool according to an embodiment of the present utility model. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] Figure 1 A power tool 100 is shown, comprising a main unit 10 configured to independently perform the designed functions of the power tool 100. For example, if the power tool 100 is designed to cut and fell timber, then the main unit 10 is a stand-alone chainsaw, allowing the user to cut and fall timber independently. The power tool 100 also includes an extension 20 (also called a lever 20) and an auxiliary control device 30, one end of which is detachably connected to the main unit 10. The extension 20 increases the reach of the main unit 10. When the main unit 10 is a stand-alone chainsaw, after the extension 20 is connected to the main unit 10, as... Figure 1 As shown, the reach of the main unit 10 is greatly increased. In this case, the power tool 100 can be used as a high-reach saw, allowing the user to cut branches at heights without having to climb to a high place. It is understood that the power tool 100 is not limited to a chainsaw; it can also be other power tools that require processing targets at heights. For example, in another embodiment, the power tool 100 can be a power high-reach shears. In this case, the main unit 10 is a stand-alone power shear, which, when connected to the extension 20, allows the power tool 100 to be used as a power high-reach shear.

[0034] After the extension section 20 is connected to the main unit 10, the reachability of the main unit 10 is greatly increased. However, this also introduces the problem that the operating components on the main unit 10 cannot be accessed by the user. The auxiliary control device 30 is provided to solve this problem. Specifically, the auxiliary control device 30 is connected to the extension section 20. For example, the auxiliary control device 30 is detachably connected to the other end of the extension section 20 opposite to the main unit 10. The auxiliary control device 30 and the main unit 10 are separated from each other by a preset distance through the extension section 20. The main unit 10 includes a main control circuit board 11 (see...). Figure 4 The main control circuit board 11 includes a controller 110 (see...). Figure 5 The auxiliary control device 30 is configured to send control signals to the controller 110 to control the host 10. It should be noted that the aforementioned "preset distance" is approximately equal to the length of the extension 20. The purpose of using the extension 20 is to increase the reachability of the host 10; therefore, the extension 20 is generally arranged to extend along the length of the host 10 and has a length significantly greater than or far greater than that of the host 10. The preset distance can be determined based on the height of the target to be processed located at a high position in the specific usage scenario.

[0035] With this configuration, the auxiliary control unit 30 can send control signals to the controller 110 to control the main unit 10, which helps to reduce the overall weight of the power tool 100 and thus improves ease of use.

[0036] refer to Figure 2 and Figure 4 In one embodiment, the main unit 10 includes a housing 101, which includes a main body portion 102 and a handle 103 connected to the main body portion 102. When used alone, the user holds the handle 103 to move the main unit 10 and apply the force required for chopping or cutting wood. The main unit 10 also includes a trigger 104 movably connected to the handle 103 and a start switch 12 disposed inside the handle 103, with the trigger 104 opposite to the start switch 12. When the user presses the trigger 104, the trigger 104 can slide or rotate relative to the handle 103 to a position that triggers the start switch 12. After the start switch 12 is triggered, the controller 110 controls the main unit 10 to start. In one embodiment, the main unit 10 includes a guide plate 105 extending from the front end of the main body portion 102, and a large portion of the saw chain 106 of the main unit 10 (i.e., the actuator of the power tool 100) is arranged around the guide plate 105, and the saw chain 106 can move around the guide plate 105 under the guidance of a guide groove (not shown) of the guide plate 105.

[0037] In one embodiment, the main unit 10 further includes a drive unit 13, a transmission unit 14, and the main control circuit board 11 disposed inside the housing 101. The input end of the transmission unit 14 is connected to the drive unit 13. The transmission unit 14 includes an output wheel 141, and a small portion of the saw chain 106 is arranged around the output wheel 141. The drive unit 13 can be a rotary motor, which is electrically connected to the controller 110. After the main unit 10 is started, the drive unit 13 outputs rotational motion. Through the transmission unit 14, the rotational motion output by the drive unit 13 is transmitted to the output wheel 141, which in turn drives the saw chain 106 to move at high speed. In other words, after the start switch 12 is triggered, the controller 110 responds to the start switch 12 and drives the saw chain 106. Understandably, electric chainsaws are known and mature electric devices, and the specific structure of the main unit 10 will not be described in further detail here.

[0038] refer to Figure 3 and Figure 4 In one embodiment, the auxiliary control device 30 includes a housing 31, which includes a main body portion 311 and a handle 312 connected to the main body portion 311. When the power tool 100 is used as a peg saw, the user can hold the main body portion 311 with one hand and the extension portion 20 with the other hand to move the power tool 100 and apply the force required to cut branches.

[0039] refer to Figure 5 In one embodiment, both the host 10 and the auxiliary control device 30 include wireless communication modules, namely wireless communication module 111 and wireless communication module 32. The wireless communication module 111 of the host 10 is electrically connected to the controller 110 so that the auxiliary control device 30 can wirelessly send control signals to the controller 110. In one embodiment, wireless communication module 111 and wireless communication module 32 are Bluetooth transceiver modules. It is understood that wireless communication module 111 and wireless communication module 32 are not limited to Bluetooth technology; other suitable wireless transmission technologies can be selected according to actual needs. For example, wireless communication module 111 and wireless communication module 32 can be based on infrared transmission technology.

[0040] Also refer to Figure 3 and Figure 4In one embodiment, the auxiliary control device 30 further includes a trigger 313 movably connected to the main body 311 and a start switch 33 disposed inside the main body 311, with the trigger 313 opposite to the start switch 33. When the user presses the trigger 313, the trigger 313 can slide or rotate relative to the main body 311 to a position that can trigger the start switch 33. In one embodiment, the auxiliary control device 30 further includes an auxiliary circuit board 34 disposed inside the main body 311, with the wireless communication module 32 disposed on the auxiliary circuit board 34. The auxiliary circuit board 34 is also provided with an auxiliary controller 35, with the wireless communication module 32 and the start switch 33 both electrically connected to the auxiliary controller 35. After the start switch 33 is triggered by the trigger 313, it sends a signal to the auxiliary controller 35, which then controls the wireless communication module 32 to send a control signal to the wireless communication module 111. Subsequently, the wireless communication module 111 sends a signal to the controller 110, which then sends a signal to activate the drive device 13. Thus, after the user holds the main body 311 and handle 312 to bring the saw chain 106 into contact with the branch to be cut, even though the user cannot access the operating parts of the main unit 10 located at a high position (such as the trigger 104), the user can still start the power tool 100 by pressing the trigger 313.

[0041] In one embodiment, the host 10 further includes a detection module 15 for detecting whether the extension 20 is connected to the host 10. The detection module 15 is electrically connected to the controller 110. When the detection module 100 detects that the extension 20 is connected to the host 10, it sends an electrical signal to the controller 110 to establish a communication connection between the controller 110 and the auxiliary control device 30. The extension 20 can be connected to the housing 101 of the host 10 using existing known connection methods, such as screws or mechanical fasteners, which will not be described in detail here. The detection module 15 can be implemented in different ways.

[0042] For example, in one embodiment, the detection module 15 is a micro switch, which includes a base 151 and an operating lever 152 (see...). Figure 6 The housing 101 of the main unit 10 is provided with a connection hole, specifically a connection hole 1021 located on the tail end of the main body 102 opposite to the saw chain 106 (see...). Figure 2 The detection module 15 is located inside the housing 101 and near the connection hole 1021. The host 10 also includes a movable piece 1022 disposed inside the housing 101 (see...). Figure 6The movable piece 1022 is rotatably or slidably connected to the housing 101. When the extension 20 is connected to the main unit 10, the end of the extension 20 opposite to the auxiliary control device 30 is received in the connection hole 1021 and pushes the movable piece 1022 to rotate or slide, thereby allowing the movable piece 1022 to rotate or slide to the position that triggers the micro switch. More specific details of the movable piece 1022 being pushed to rotate or slide will be described in detail below. Specifically, the movable piece 1022 can rotate or slide to the position that contacts and pushes the operating lever 152, which then deflects relative to the base 151. When the deflection of the operating lever 152 reaches a preset angle, the micro switch is triggered. The detection module 15 then sends an electrical signal to the auxiliary control device 30. In response to the electrical signal from the detection module 15, the auxiliary control device 30 and the controller 110 establish a communication connection. Specifically, the controller 110 controls the pairing of the wireless communication module 111 and the wireless communication module 32, similar to the pairing between two Bluetooth devices (such as a smartphone and a Bluetooth wireless headset). Only paired Bluetooth devices can communicate and correctly parse the communication content. After pairing, the controller 110 and the auxiliary control device 30 can communicate through the wireless communication module 111 and the wireless communication module 32.

[0043] For example, in another embodiment, the detection module 15 is a Hall sensor, and the end of the extension 20 opposite to the auxiliary control device 30 includes a magnet (not shown). When the extension 20 is connected to the host 10, the end of the extension 20 is received in the connection hole 1021. The detection module 15 is located inside the housing 101 and close to the connection hole 1021. After the end of the extension 20 is received in the connection hole 1021, the output of the detection module 15 changes due to the magnetic field strength exceeding a preset threshold, for example, from a low level to a high level. In response to the change in the output of the detection module 15, the controller 110 and the auxiliary control device 30 establish a communication connection.

[0044] Understandably, the detection module 15 is not limited to the aforementioned scenario, and other suitable technologies can be selected according to actual conditions. For example, in another embodiment, the detection module 15 may include an infrared light-emitting diode and an infrared receiver tube, both disposed in the connection hole 1021. When the end of the extension 20 is not inserted into the connection hole 1021, the infrared receiver tube can receive the infrared light emitted by the infrared light-emitting diode. After the end of the extension 20 is inserted into the connection hole 1021, the infrared light emitted by the infrared light-emitting diode is blocked by the end of the extension 20 and cannot be received by the infrared receiver tube, thereby changing the output of the infrared receiver tube. Based on this change, the controller 110 can determine that the end of the extension 20 is inserted into the connection hole 1021.

[0045] With the above-described configuration, after the user connects the extension unit 20 to the main unit 10, the auxiliary control device 30 is immediately usable without requiring any additional operation from the user. In other words, after connecting the extension unit 20 to the main unit 10, the user can use the auxiliary control device 30 to start the electric device 100 at any time, which increases the ease of use of the electric device 100. In one embodiment, to further ensure the reliability of the electric device 100, the start switch 12 in the main unit 10 is "disabled" after the user connects the extension unit 20 to the main unit 10. Here, "disabled" means that even if the start switch 12 is accidentally triggered by the trigger 104 due to a tree branch or other object, the electric device 100 will not start. "Disabled" can be implemented in different ways.

[0046] For example, in one embodiment, the host also includes an electronic switch 112 (e.g., a transistor or MOSFET), which is disposed on the main control circuit board 11. The electronic switch 112 is electrically connected to the start switch 12 and the controller 110. After receiving the electrical signal from the detection module 15, the controller 110 sends an electrical signal to the electronic switch 112 to switch the electronic switch 112 from the on state to the off state. In this way, the electrical connection between the start switch 12 and the controller 110 is cut off, thereby enabling the device to not start even if the start switch 12 is accidentally triggered by the trigger 104 due to a tree branch or other object, because the start signal cannot be sent to the controller 110. That is, after the detection module 15 detects that the extension 20 is connected to the host 10, the electrical connection between the start switch 12 and the controller 110 is broken and rendered ineffective.

[0047] For example, in another embodiment, the main unit 10 also includes a single-pole double-throw switch (not shown), which includes a common terminal, a normally open terminal, and a normally closed terminal. The common terminal and the normally closed terminal are electrically connected to the start switch 12 and the controller 110, respectively. When the extension 20 is connected to the main unit 10, the end of the extension 20 opposite to the auxiliary control device 30 is received in the connection hole 1021 and can actuate the rocker arm of the single-pole double-throw switch, causing the single-pole double-throw switch to switch from being connected by the common terminal and the normally closed terminal to being connected by the common terminal and the normally open terminal. In this way, the electrical connection between the start switch 12 and the controller 110 is cut off. Thus, the start signal cannot be sent to the controller 110, and even if the start switch 12 is triggered by the trigger 104 due to accidental contact by a tree branch or other object, the electric device 100 will not start.

[0048] For example, in another embodiment, the start switch 12 can be "disabled" by disabling it through software logic. Specifically, the start logic of the electric device 100 can be controlled by a program running on the controller 110. For example, if a certain condition is met, the controller 110 will not start the electric device 100 even if it receives the start signal from the start switch 12. This condition may include, but is not limited to: low battery voltage; high temperature of the drive unit; the electric device 100 tool being in charging mode or maintenance mode; and detection that the extension 20 is connected to the host 10.

[0049] As can be seen from the above description, the main unit 10 of the power tool 100 can be used independently, for example, in Figure 1 In the illustrated embodiment, the main unit 10 can be used independently as an electric chainsaw. With the extension 20 connected to the main unit 10, the power tool 100 is suitable for scenarios where the target to be processed is at a high position, for example, in... Figure 1 In the illustrated embodiment, the power tool 100 can be used as a peg saw. After the extension 20 is connected to the main unit 10, the main unit 10 and the auxiliary control device 30 can immediately establish a wireless communication connection without additional user operation. This facilitates remote start-up of the main unit 10 via the auxiliary control device 30 without increasing the weight of the power tool 100. Furthermore, after the extension 20 is connected to the main unit 10, the start switch 12 on the main unit 10 is "disabled," meaning that even if the start switch 12 is accidentally triggered by a tree branch or other object, the power tool 100 will not start, effectively ensuring the reliability of the power tool. Moreover, the extension 20 is detachably connected to the main unit 10, and the auxiliary control device 30 is detachably connected to the extension 20. When the power tool 100 is not in use, the extension 20 can be removed from the main unit 10, and the auxiliary control device 30 can be removed from the extension 20. This reduces the space required for storing the power tool 100 and facilitates transportation.

[0050] In another embodiment, the extension 20 is a single, complete rod. In this case, one end of the extension 20 is connected to the main unit 10. In one embodiment, the extension 20 is composed of multiple independent sub-extensions connected to each other, for example, in... Figure 1In the illustrated embodiment, the extension 20 includes a first rod 21 and a second rod 22 detachably connected to each other. The advantage of this configuration of the extension 20 is that different lengths of extension 20 can be provided by connecting different numbers of sub-extensions, thereby giving the electric device 100 different accessibility and thus greater adaptability. One end of the first rod 21 is connected to the main unit 10, and one end of the second rod 22 is connected to the auxiliary control device 30. Regardless of the embodiment, detachable connections are involved between the main unit and the sub-extensions, between sub-extensions, and between the sub-extensions and the auxiliary control device 30. In one embodiment, all of the above detachable connections are implemented using connecting components with the same configuration. The following description uses the example of the extension 20 being constructed by connecting the first rod 21 and the second rod 22 together.

[0051] refer to Figures 7 to 10 To enable detachable connections between the main unit 10 and the first rod 21, the first rod 21 and the second rod 22, or the second rod 22 and the auxiliary control device 30, this patent application also provides a connecting assembly 40. For ease of explanation, the following will illustrate the connection of the connecting assembly 40 between the first rod 21 and the second rod 22. The connecting assembly 40 includes: a base 50, a locking member 60, and an elastic member 70 (see...). Figure 11 The base 50 and the locking member 60 are respectively fixed to the first rod 21 and the second rod 22 that cooperate with the power tool 100. The elastic member 70 is connected to the base 50, and the base 50 is detachably connected to the locking member 60. The elastic member 70 applies a pushing force to the locking member 60 so that when the locked connection between the base 50 and the locking member 60 is released, the locking member 60 is pushed away from the position locked to the base 50.

[0052] With the above structure, when the locking connection between the base 50 and the locking member 60 is released, the thrust of the elastic member 70 can automatically push the locking member 60 away from the position where it is locked to the base 50, which provides convenience for the user to separate the base 50 and the locking member 60, which also means separating the first rod 21 and the second rod 22.

[0053] In one embodiment, each of the opposite ends of the first rod 21 and the second rod 22 is provided with a receiving hole, and the base 50 and the locking member 60 are respectively received and fixed in the receiving holes of the first rod 21 and the second rod 22. For example, the base 50 and the locking member 60 can be fixed in the receiving holes of the first rod 21 and the second rod 22 by adhesive.

[0054] In one embodiment, the base 50 includes a hollow cylindrical portion 51 and a movable portion 52. The cylindrical portion 51 is wholly or partially housed in a receiving hole of the first rod 21. The cylindrical portion 51 has receiving cavities 511 extending along its length and open at both ends (see...). Figure 8 and Figure 11 The locking member 60 includes a body 61 and a post 62 connected to the body 61. In one embodiment, the post 62 protrudes from one end of the body 61 in the longitudinal direction. The body 61 is entirely housed in the receiving hole of the second rod 22, while the post 62 protrudes from the second rod 22. The post 62 extends into the interior of the base 50 from its open end and engages with the base 50. The post 62 is movable relative to the base 50 along the longitudinal direction of the rod. Specifically, the post 62 extends into the interior of the cylindrical portion 51 (i.e., the receiving cavity 511) from its open end 501 facing the locking member 60. The post 62 is movable relative to the cylindrical portion 51 along the longitudinal direction of the cylindrical portion 51 (i.e., with the receiving cavity 511). Figure 10 The cylinder 62 can be inserted into the receiving cavity 511 along the length of the cylindrical portion 51 relative to the cylindrical portion 51, and can be moved out of the receiving cavity 511 along the length of the cylindrical portion 51 relative to the cylindrical portion 51.

[0055] In one embodiment, a through hole 512 is provided on the circumferential side of the cylindrical portion 51, the through hole 512 communicating with the receiving cavity 511. The movable part 52 passes through the through hole 512 and is movably received inside the cylindrical portion 51 (i.e., the receiving cavity 511). The movable part 52 is movable relative to the cylindrical portion 51 along the radial direction of the cylindrical portion 51 (i.e., relative to the radial direction of the cylindrical portion 51). Figure 10 It moves in the direction parallel to the Y-axis. Figure 12 From the displayed perspective, the movable part 52 can move upwards and downwards within the receiving cavity 511. In summary, the direction of movement of the column 62 intersects the direction of movement of the movable part 52. Figure 12 From the displayed perspective, the column 62 can move in the horizontal direction, while the moving part 52 can move in the vertical direction, that is, the moving direction of the column 62 and the moving direction of the moving part 52 are perpendicular to each other.

[0056] The column 62 and the movable part 52 engage, locking the locking member 60 to the base 50. In one embodiment, the connecting assembly 40 further includes a button 71 connected to the base 50. When the button 71 is pushed by the user, it pushes the base 50 to release the locked connection between the base 50 and the locking member 60. Specifically, the button 71 is connected to the movable part 52, in... Figure 8From the displayed viewpoint, the button 71 is connected to the top of the moving part 52. Corresponding to the button 71, a through hole 211 is provided on the circumferential side of the first rod 21, and the button 71 is received in the through hole 211, so that the user can release the locking connection between the base 50 and the locking member 60 by pressing the button 71.

[0057] refer to Figure 13 In one embodiment, the movable part 52 includes a base 521 and a protrusion 522 protruding from one end of the base 521. The button 71 is fixed to the protrusion 522. For example, the button 71 can be connected to the protrusion 522 by conventional connection methods such as glue or mechanical engagement. The base 521 includes a through hole 523 provided on the circumferential side of the base 521 (see...). Figure 10 After the base 521 is received in the receiving cavity 511 of the cylindrical portion 51, the through hole 523 is aligned with the through hole of the opening end 501 of the cylindrical portion 51. Thus, the post 62 of the locking member 60 can extend from the through hole of the opening end 501 into the receiving cavity 511 and into the through hole 523. The inner surface of the through hole 523 includes two opposing arcuate inner surfaces 5231 (see...). Figure 12 5231 and 5232, wherein the arcuate inner surface 5231 is closer to the protrusion 522 than the arcuate inner surface 5232. The arcuate inner surface 5232 has a protruding engaging block 5233. In one embodiment, the surface 5234 of the engaging block 5233 facing the opening end 501 of the cylindrical portion 51 is an inclined surface relative to the arcuate inner surface 5232, and the surface 5235 of the engaging block 5233 opposite to the surface 5234 is substantially perpendicular to the arcuate inner surface 5232.

[0058] refer to Figure 14 In one embodiment, the locking member 60 further includes a locking block 621 protruding from the circumferential side of the column 62. To ensure that the locking block 621 can engage with the locking block 5233 regardless of the user's insertion posture of the column 62 into the through hole 523 of the moving part 52, the locking block 621 is a 360-degree surround of the circumferential side of the column 62; that is, the locking block 621 is a complete rotating body surrounding the circumferential side of the column 62. In one embodiment, the surface 6211 of the locking block 621 facing away from the body 61 is an inclined surface relative to the circumferential side of the column 62, and the surface 6212 of the locking block 621 facing away from the body 61 is substantially perpendicular to the circumferential side of the column 62.

[0059] refer to Figure 12 In one embodiment, the connecting assembly 40 further includes a reset elastic element 72 (e.g., a cylindrical helical spring), which is housed inside the cylindrical portion 51 (i.e., the receiving cavity 511), and whose two ends abut against the cylindrical portion 51 and the moving portion 52, respectively. Figure 12From the viewing angle, the bottom end of the reset elastic member 72 abuts against the inner surface of the receiving cavity 511 of the cylindrical portion 51, the top end of the reset elastic member 72 abuts against the bottom end of the moving portion 52, and the reset elastic member 72 is in a compressed state.

[0060] With the above-described structure, when connecting the first rod 21 and the second rod 22, the user can first align the post 62 of the locking member 60 with the opening end 501 of the base 50. Then, under the user's operation, the post 62 gradually extends from the through hole of the opening end 501 into the receiving cavity 511 of the cylindrical portion 51 of the base 50. After extending into the receiving cavity 511, the post 62 gradually extends into the through hole 523 of the moving part 52. During this process, the locking block 621 of the post 62 contacts the locking block 5233 of the moving part 52. Since the surface 5234 of the locking block 5233 facing the opening end 501 of the cylindrical portion 51 is inclined and the moving part 52 can move in a direction perpendicular to the moving direction of the post 62, the locking block 621 will not be stuck by the locking block 5233. The moving part 52 moves due to the pressure from the locking block 621 (in Figure 12 (From a downward perspective), allowing the locking block 621 to continue moving along surface 5234 until it has completely passed surface 5234. Afterward, the moving part 52 moves back to its initial position under the elastic thrust of the reset elastic member 72 (in...). Figure 12 (From the perspective of upward movement). After the moving part 52 returns to its initial position, the surface 5235 of the engaging block 5233 abuts against the surface 6212 of the engaging block 621, thereby causing the engaging block 5233 to engage with the engaging block 621 and preventing the post 62 of the locking member 60 from disengaging from the moving part 52. In this way, the base 50 and the locking member 60 are locked together, connecting the first rod 21 and the second rod 22.

[0061] refer to Figure 10 and Figure 12 In one embodiment, the connecting assembly 40 further includes a guide portion 80, which has a guide through hole 81 extending along its length. The guide portion 80 is located within the base 50; specifically, a portion of the guide portion 80 is fixed in the receiving cavity 511 of the cylindrical portion 51 of the base 50, and another portion extends into the through hole 523 of the moving portion 52. When the base 50 and the locking member 60 are locked together, the end of the column 62 extends from the first opening end 811 of the guide through hole 81 (see...). Figure 9 and Figure 12The elastic member 70 extends into the guide hole 81. In one embodiment, the connecting assembly 40 further includes an end cap 90, which is fixed to the open end 502 of the cylindrical portion 51 opposite to the column 62. One end of the elastic member 70 abuts against the inner end face of the end cap 90, and the other end of the elastic member 70 passes through the second open end 812 of the guide hole 81 and abuts against the end of the column 62, and the elastic member 70 is in a compressed state. Thus, due to the elastic thrust of the elastic member 70 on the column 62, the surface 6212 of the locking block 621 tightly abuts against the surface 5235 of the locking block 5233, so that the base 50 and the locking member 60 are firmly locked together. When it is necessary to separate the first rod 21 and the second rod 22, the user can press and hold the button 71. The button 71 pushes the moving part 52 to move until the surface 6212 of the engaging block 621 disengages from the surface 5235 of the engaging block 5233. At this time, the column 62 is no longer restricted by the engaging block 5233 of the moving part 52 and is in a free-moving state. Under the push of the elastic member 70, it moves a distance away from the end cover 90, thereby causing the engaging block 621 to leave the position where it can engage with the engaging block 5233. In other words, when the locked connection between the base 50 and the locking member 60 is released (i.e., when the surface 6212 of the engaging block 621 disengages from the surface 5235 of the engaging block 5233), the elastic member 70 applies a pushing force to the locking member 60 to push the locking member 60 away from the position where it is locked to the base 50.

[0062] In one embodiment, the elastic element 70 is a cylindrical helical spring, in which case one end of the elastic element 70 needs to be fixed to the inner end face of the end cap 90. In another embodiment, refer to... Figure 11 The elastic element 70 includes a cylindrical helical spring 701 and a spring bracket 702. A convex wall 703 protrudes from the circumferential side of the spring bracket 702. One end of the cylindrical helical spring 701 abuts against the inner end face of the end cap 90, and the other end of the cylindrical helical spring 701 is fitted onto the circumferential side of the spring bracket 702 and abuts against the convex wall 703. The end of the spring bracket 702 opposite to the cylindrical helical spring 701 passes through the second opening end 812 of the guide hole 81 and abuts against the end of the column 62. When the column 62 is no longer restricted by the locking block 5233 of the moving part 52 and is in a free-moving state, the spring bracket 702, pushed by the cylindrical helical spring 701, pushes the column 62 a certain distance away from the end cap 90 until the convex wall 703 abuts against the second opening end 812 of the guide part 80, preventing the spring bracket 702 from moving further.

[0063] refer to Figure 9 and Figure 14 In one embodiment, the column 62 includes a non-circular cross-section (e.g., Figure 9The positioning portion 622 (shown as a triangle) is located within the base 50 (specifically, the cylindrical portion 51). The base 50 includes a positioning cavity 513 whose cross-sectional shape matches that of the positioning portion 622. The positioning cavity 513 extends inward from the opening end 501 of the cylindrical portion 51 and communicates with the receiving cavity 511. The positioning portion 622 is housed within the positioning cavity 513 to prevent relative rotation between the base 50 and the locking member 60, thereby ensuring that the engaging block 621 will not disengage from the engaging block 5233 due to relative rotation between the base 50 and the locking member 60. In other words, the positioning portion 622 housed within the positioning cavity 513 ensures the reliability of the connection between the base 50 and the locking member 60.

[0064] refer to Figure 9 and Figure 13 In one embodiment, the inner surface of the receiving cavity 511 of the cylindrical portion 51 is provided with a protruding rib 514, and the outer surface of the movable portion 52 is provided with a guide groove 524. The protruding rib 514 is slidably received in the guide groove 524, so that the movable portion 52 can move relative to the cylindrical portion 51 along the radial direction of the cylindrical portion 51 (i.e., with respect to the cylindrical portion 51). Figure 10 It moves in the direction parallel to the Y-axis.

[0065] Understandably, the connecting assembly 40 is not limited to the detachable connection between the first rod 21 and the second rod 22; it can also be used for the detachable connection between the extension 20 and the main unit 10, and for the detachable connection between the extension 20 and the auxiliary control device 30. It should be noted that when the connecting assembly 40 is used for the detachable connection between the extension 20 and the main unit 10, it also involves pushing the aforementioned movable piece 1022; therefore, the connecting assembly 40 requires a minor modification. Specifically, refer to... Figure 15 The base 50 of the connecting assembly 40 is disposed on the main body portion 102 of the host 10, and the open end of the base 50 is exposed, serving as the aforementioned connecting hole 1021. The locking member 60 of the connecting assembly 40 is connected to one end of the extension portion 20. With this configuration, when connecting the extension portion 20 and the host 10, the user can first align the post 62 of the locking member 60 with the open end 501 of the base 50.

[0066] Then, under the user's operation, the column 62 gradually extends from the through hole of the opening end 501 into the receiving cavity 511 of the cylindrical portion 51 of the base 50. After extending into the receiving cavity 511, the column 62 gradually extends into the through hole 523 of the moving part 52. During this process, the engaging block 621 of the column 62 contacts the engaging block 5233 of the moving part 52. Since the surface 5234 of the engaging block 5233 facing the opening end 501 of the cylindrical portion 51 is inclined and the moving part 52 can move in a direction perpendicular to the moving direction of the column 62, the engaging block 621 will not be stuck by the engaging block 5233. The moving part 52 moves under the pressure from the engaging block 621, allowing the engaging block 621 to continue moving along the surface 5234 until it has completely passed the surface 5234. Afterward, the moving part 52 moves back to its initial position under the elastic thrust of the reset elastic member 72 (in Figure 15 (From the perspective of upward movement). After the moving part 52 returns to its initial position, the surface 5235 of the engaging block 5233 abuts against the surface 6212 of the engaging block 621, thereby causing the engaging block 5233 to engage with the engaging block 621 and preventing the post 62 of the locking member 60 from disengaging from the moving part 52. In this way, the base 50 and the locking member 60 are locked together, so that the extension 20 and the main unit 10 are connected together.

[0067] In this embodiment, compared to Figure 11 The implementation method shown, Figure 15 The power tool in the illustrated embodiment also includes a movable plate pushing part 1023, on which the cylindrical helical spring 701 is fitted. One end of the movable plate pushing part 1023 passes through a through hole 901 on the end cap 90 and connects to the movable plate 1022. The other end of the movable plate pushing part 1023 protrudes from a protrusion 1024. The radial dimension of the movable plate pushing part 1023 is smaller than the radial dimension of the through hole 901. The spring support 702 is provided with a receiving hole 7021 extending along its length. The protrusion 1024 extends into the receiving hole 7021. The movable plate pushing part 1023 is provided such that the end of the protrusion 1024 abuts against the end of the spring support 702, and the radial dimension of the protrusion 1024 is smaller than the radial dimension of the receiving hole 7021. Figure 15 In the illustrated embodiment, the movable piece 1022 is rotatably connected to the housing 101 (specifically, rotatably connected to the main body 102). With this configuration, as the aforementioned engaging block 621 continues to move along the surface 5234, the end of the post 62 of the locking member 60 extends from the first opening end 811 of the guide hole 81 into the guide hole 81 and pushes the spring bracket 702 in contact with it to move. Figure 15From the displayed perspective, this appears as the spring bracket 702 moving to the left. The spring bracket 702 then applies a pushing force to the movable piece pusher 1023. Since the movable piece 1022 is rotatably connected to the housing 101, the pushing force on the movable piece pusher 1023 causes the movable piece 1022 to rotate. When the surface 5235 of the engaging block 5233 abuts against the surface 6212 of the engaging block 621, the movable piece 1022 rotates precisely to a position that triggers the detection module 15. In other words, the rotation of the movable piece 1022, caused by the connection between the extension 20 and the main unit 10, triggers the detection module 15.

[0068] Understandably, the movable piece 1022 can also be slidably connected to the housing 101. During the continued movement of the aforementioned engaging block 621 along the surface 5234, the end of the post 62 of the locking member 60 extends from the first opening end 811 of the guide hole 81 into the guide hole 81 and pushes the spring bracket 702 in contact with it to move. Figure 15 From the displayed perspective, this appears as the spring bracket 702 moving to the left. The spring bracket 702 then applies a thrust to the moving piece pusher 1023. This causes the moving piece 1022 to move to the left. In this embodiment, the detection module 15 needs to be adjusted to the left side of the moving piece 1022. Thus, the leftward movement of the moving piece 1022 can trigger the detection module 15.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A power tool, characterized in that, include: The host includes a main control circuit board, a start switch, and an actuator. The main control circuit board includes a controller that drives the actuator in response to the start switch. An extension section, one end of which is detachably connected to the main unit; and An auxiliary control device is connected to the extension section, and the auxiliary control device and the main unit are separated by a preset distance through the extension section. The auxiliary control device is configured to send control signals to the controller to control the actuator of the main unit.

2. The power tool according to claim 1, characterized in that, Both the host and the auxiliary control device include a wireless communication module. The wireless communication module of the host is electrically connected to the controller so that the auxiliary control device can wirelessly send control signals to the controller.

3. The power tool according to claim 1, characterized in that, The host also includes a detection module for detecting whether the extension is connected to the host. The detection module is electrically connected to the controller. After the detection module detects that the extension is connected to the host, the controller and the auxiliary control device establish a communication connection.

4. The power tool according to claim 3, characterized in that, After the detection module detects that the extension is connected to the host, the electrical connection between the start switch and the controller is disconnected and becomes ineffective.

5. The power tool according to claim 4, characterized in that, The host also includes an electronic switch, which is electrically connected to the start switch and the controller. After receiving the electrical signal from the detection module, the controller sends an electrical signal to the electronic switch to switch the electronic switch from the on state to the off state.

6. The power tool according to claim 3, characterized in that, The detection module is a micro switch. The host includes a housing with a connection hole and a movable piece disposed inside the housing. The movable piece is rotatably or slidably connected to the housing. The detection module is disposed inside the housing. When the extension is connected to the host, the end of the extension is received in the connection hole and causes the movable piece to rotate or slide, thereby triggering the micro switch.

7. The power tool according to claim 6, characterized in that, It also includes a connecting assembly comprising a base, a locking member, and an elastic member. The base is disposed in the connecting hole, the locking member is connected to the extension, and the elastic member is connected to the base. The base is detachably connected to the locking member. The elastic member applies a pushing force to the locking member to push the locking member away from the locked connection position with the base when the locked connection between the base and the locking member is released. When the locking member is connected to the base, it causes the movable piece to rotate or slide, thereby causing the movable piece to trigger the micro switch.

8. The power tool according to claim 3, characterized in that, The detection module is a Hall sensor. The host includes a housing, and the detection module is disposed inside the housing. The housing is provided with a connection hole. The end of the extension includes a magnet. When the extension is connected to the host, the end of the extension is received in the connection hole.

9. The power tool according to claim 3, characterized in that, The main unit also includes a single-pole double-throw switch and a start switch. The single-pole double-throw switch includes a common terminal, a normally open terminal, and a normally closed terminal. The common terminal and the normally closed terminal are electrically connected to the start switch and the controller, respectively. The main unit includes a housing with a connection hole. When the extension is connected to the main unit, the end of the extension is received in the connection hole and can touch the rocker of the single-pole double-throw switch, causing the single-pole double-throw switch to switch from being connected by the common terminal and the normally closed terminal to being connected by the common terminal and the normally open terminal.

10. The power tool according to claim 1, characterized in that, The auxiliary control device is detachably connected to the other end of the extension section opposite to the main unit. The extension section includes multiple sub-extension sections. Any two adjacent extension sections, the sub-extension section adjacent to the main unit and the main unit, and the sub-extension section adjacent to the auxiliary control device are all detachably connected together by a connecting component of the same structure.

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