Electric tool

Abstract

The invention provides an electric tool, comprising a housing provided with a chute; the trigger switch is arranged in the shell; the button assembly comprises a button and an elastic piece, the button is movably connected to the shell, the button comprises a body and a trigger part which is connected to the body and located in the shell, one end of the body penetrates through the sliding groove to be exposed, and the elastic piece is arranged in the shell and is connected with the body. The body can move from an initial position to a first position along the sliding groove after being pushed, the body can move towards the interior of the shell after being pressed so as to drive the trigger part to move to a second position capable of triggering the trigger switch, and the elastic piece is configured to drive the body to move from the second position to the initial position. As the trigger switch needs two-step operation (namely pushing first and pressing later), the electric tool can be effectively prevented from being started by mistake due to the fact that a user presses or pushes the button unintentionally.

Description

Technical Field

[0001] The present invention relates to power tools, and particularly to a power tool with a start switch. Background Art

[0002] A variety of power tools have emerged on the market, such as electric saws, angle grinders, and cutters. Due to their high power, high speed, or complex operation, these power tools need to be used with special caution, otherwise it is easy to cause safety accidents. Therefore, it is necessary to provide a power tool that can prevent the power tool from operating (such as starting) due to the user's misoperation. Summary of the Invention

[0003] Therefore, the present invention provides a power tool, the button assembly of which can effectively prevent the trigger switch from being triggered due to misoperation.

[0004] To solve the above technical problems, the present invention provides a power tool, which includes: a housing provided with a chute; a trigger switch disposed inside the housing; and a button assembly including a button and an elastic member. The button is movably connected to the housing. The button includes a body and a trigger portion connected to the body and located inside the housing. One end of the body passes through the chute and is exposed. The elastic member is disposed inside the housing. After the body is pushed, it can move along the chute from an initial position to a first position. After the body is pressed, it can move towards the inside of the housing and drive the trigger portion to move to a second position where the trigger switch can be triggered. The elastic member is configured to drive the body to move from the second position to the initial position.

[0005] Optionally, the button assembly further includes a base disposed inside the housing. One end of the elastic member abuts against the base, and the other end of the elastic member abuts against the body or the trigger portion. The elastic member is in a compressed state.

[0006] Optionally, the button assembly further includes a shaft. The base includes a substrate. The elastic member abuts against a first side surface of the substrate. A through hole is provided on the first side surface of the substrate. The body of the button passes through the through hole. A guiding groove is provided on the body of the button. Two spaced-apart fixing blocks are provided on a second side surface of the substrate opposite to the first side surface. The shaft is fixed to the two fixing blocks and passes through the guiding groove.

[0007] Optionally, the button assembly further includes a limiting member fixed to the body and located inside the housing. When the body is in the first position, the limiting member abuts against the inner surface of the housing.

[0008] Optionally, a side plate protrudes from the first side surface of the substrate, a positioning portion protrudes from the side plate, the housing is provided with a receiving groove, and the positioning portion is received in the receiving groove to position the base relative to the housing.

[0009] Optionally, the distance between the button and the center of gravity of the power tool is less than the distance between the trigger switch and the center of gravity of the power tool.

[0010] Optionally, it further includes a driving device arranged in the housing, a transmission device connected to the driving device, and a locking structure. The transmission device includes an output shaft, and the locking structure is configured to lock the output shaft.

[0011] Optionally, a groove is provided on the circumferential side surface of the output shaft. The locking structure includes a locking rod and a spring-loaded locking button. The locking rod is slidably connected to the housing. The bottom end surface of the locking rod faces the circumferential side surface of the output shaft. The spring-loaded locking button is fixed to the top end of the locking rod. The spring-loaded locking button can drive the locking rod to move from an unlocking position towards the circumferential side surface of the output shaft until it moves to a locking position after being pressed. In the locking position, the bottom end of the locking rod is received in the groove. The spring-loaded locking button is configured to return to the unlocking position under the action of its own elastic force. In the unlocking position, the bottom end of the locking rod leaves the groove.

[0012] Optionally, it further includes a driving device, a controller, and a speed regulation component arranged in the housing. The controller is electrically connected to the driving device. The speed regulation component includes a knob, a gear, and a rotary potentiometer. The knob is rotatably connected to the housing. Teeth meshing with the gear are provided on the inner side wall of the knob. The rotary potentiometer is fixed in the housing and is electrically connected to the controller. The gear is coaxially fixed to the rotating shaft of the rotary potentiometer. When the knob rotates, it can drive the gear to rotate, and the rotating shaft can rotate synchronously with the gear. The controller adjusts the output of the driving device according to the resistance change of the potentiometer caused by the rotation of the rotating shaft.

[0013] Optionally, it further includes a display module. The housing includes a cylindrical hollow cylinder. The display module is partially received in the cylindrical hollow cylinder and is detachably connected to the cylindrical hollow cylinder. A ring groove is formed at the top ends of the display module and the cylindrical hollow cylinder. A protruding portion protrudes from the inner side surface of the knob. The knob is sleeved on the outer side surface of the cylindrical hollow cylinder, and the protruding portion is received in the ring groove to prevent the knob from detaching from the housing.

[0014] The technical solution of the present invention has the following advantages: After the body of the button is pushed and moves from the initial position to the first position, and then is pressed and moves from the first position to the second position, the trigger part can trigger the trigger switch. Because two operations (i.e., first push and then press) are required to trigger the trigger switch, this can effectively prevent the user from accidentally pressing or pushing the button and causing the accidental start of the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Is a perspective view of a power tool according to an embodiment of the present invention.

[0017] Figure 2 Is a perspective view of the power tool according to an embodiment of the present invention from another angle, where some components are omitted.

[0018] Figure 3 Is an exploded view of the power tool according to an embodiment of the present invention.

[0019] Figure 4 Is an exploded view of the power tool according to an embodiment of the present invention from another angle.

[0020] Figure 5 Is a perspective view of the button assembly of the power tool according to an embodiment of the present invention.

[0021] Figure 6 Is a perspective view of the button assembly of the power tool according to an embodiment of the present invention from another angle.

[0022] Figure 7 Is a planar exploded view of the button assembly of the power tool according to an embodiment of the present invention.

[0023] Figure 8 Is a perspective view of the base of the button assembly of the power tool according to an embodiment of the present invention.

[0024] Figure 9 Is a perspective view of the power tool according to an embodiment of the present invention from another angle, where some components are omitted.

[0025] Figure 10 Is an exploded view of the power tool according to an embodiment of the present invention, where some components are omitted.

[0026] Figure 11 Another exploded view of the power tool according to an embodiment of the present invention, in which some components are omitted.

[0027] Figure 12 Another perspective view of the power tool according to an embodiment of the present invention, in which some components are omitted.

[0028] Figure 13 Another exploded view of the power tool according to an embodiment of the present invention.

[0029] Figure 14 Another exploded view of the power tool according to an embodiment of the present invention. Detailed implementation manners

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Reference Figure 1-4 , in one embodiment, a power tool 100 (for example, a cutting machine) includes a housing 10, a trigger switch 20 (see Figure 4 and Figure 5 ) and a button assembly 30. The housing 10 has a chute 11. The trigger switch 20 is disposed inside the housing 10. Also referring to Figures 5 to 8 , the button assembly 30 includes a button 31, a base 32 and an elastic member 33. The base 32 and the elastic member 33 are disposed inside the housing 10. The button 31 is movably connected to the housing 10. The button 31 includes a body 311 and a trigger portion 312 connected to the body 311 and located inside the housing 10. One end of the body 311 passes through the chute 11 and is exposed. One end of the elastic member 33 abuts against the base 32, and the other end of the elastic member 33 abuts against the body 311 or the trigger portion 312. The elastic member 33 is in a compressed state. During use, after the body 311 is pushed by a user, it can move along the chute 11 from an initial position to a first position. Thereafter, when the body 311 is subjected to pressure from the user, it can move into the housing 10 and drive the trigger portion 312 to move to a second position where the trigger switch 20 can be triggered. Finally, the body 311 can move from the second position to the initial position under the push of the elastic member 33.

[0033] In one embodiment, the trigger switch 20 serves as the start switch of the power tool 100, that is, after the trigger switch 20 is triggered, the power tool 100 is started. Understandably, according to needs, the trigger switch 20 can also be used to control other functions that require prevention of accidental operation. In addition, the power tool 100 is not limited to a cutting machine, and it can be other types of power tools, such as a screwdriver, an electric grinder, a saw, etc.

[0034] With the above structure, when needed, the user can first push the button 31 with the thumb and then press the button 31 to trigger the trigger switch 20, thereby starting the power tool 100, and can push and press the button while grasping the housing 10 to achieve single-handed operation. Since triggering the trigger switch 20 requires two steps of operation (i.e., first push and then press), this can effectively prevent the user from accidentally starting the power tool 100 by pressing or pushing the button 31. In addition, the above two-step operation only requires the user to use the thumb to easily complete, improving the operation efficiency.

[0035] The base 32 is an independent component in the above embodiment. Understandably, in other embodiments, the base 32 can be a part of the housing 10. At this time, there is no independent base 32, and corresponding structures are provided inside the housing 10 to achieve the function of the base 32.

[0036] In one embodiment, the initial position refers to Figure 1 the position where the main body 311 abuts or is close to abutting against the bottom end of the chute 11; the first position refers to Figure 1 the position where the main body 311 abuts against the top end A of the chute 11. Thus, when the user pushes the main body 311, the main body 311 abuts against the top end of the chute 11 and cannot move, which enables the user to sense that the main body 311 has reached the first position without the user having to visually determine whether the main body 311 has been pushed to the first position, which is beneficial to improving the operation efficiency.

[0037] In one embodiment, a stop protrusion 12 protrudes from the inner surface of the chute 11 of the housing 10 at a position corresponding to the initial position (see Figure 1 and Figure 3 ), and the main body 311 of the button 31 further includes a stepped surface 313 (see Figure 7) When in this initial position, the stepped surface 313 of the body 311 is located above the stop projection 12. The cooperation between the stepped surface 313 and the stop projection 12 can prevent the body 311 from moving inwardly into the housing 10 when pressure is applied at the initial position. The stepped surface 31 and the stop projection 12 are in contact or there is a very small gap between them. After the body 311 is subjected to pressure inadvertently applied by the user at the initial position, due to the contact between the stepped surface 313 and the stop projection 12 or the stepped surface 313 will immediately contact the stop projection 12, the body 311 cannot move inwardly into the housing 10. That is to say, at this first position, the body 311 cannot move inwardly into the housing 10. The stop projection 12 only exists on a part of the inner surface of the chute 11. In this embodiment, in Figure 1 In the perspective of

[0038] In one embodiment, the housing 10 includes a first half-shell 101 and a second half-shell 102, which are detachably connected together to form the housing 10. After the first half-shell 101 and the second half-shell 102 are connected together, a head 103 and a grip portion 104 are formed. The head 103 is used to accommodate the driving device, transmission device, first circuit board 61, etc. of the power tool 100, and the grip portion 104 houses a battery, a second circuit board 62, etc. The user will hold the grip portion 104 during use. In one embodiment, the chute 11 is provided on the grip portion 104, and most of the button assembly 30 is received in the grip portion 104. The housing 10 is generally in a T-shaped structure, that is, the length direction of the head 103 and the length direction of the grip portion 104 are substantially perpendicular. In this embodiment, the grip portion 104 is generally cylindrical, and the chute 11 extends along the length direction of the grip portion 104. Such an arrangement conforms to ergonomics because when the user holds the grip portion 104, the thumb generally extends along the length direction of the grip portion 104, and the above arrangement of the chute 11 is beneficial for the user's thumb to apply force to the button 31 of the button assembly 30.

[0039] It should be noted that in one embodiment, the power tool 100 may further include a decorative shell 105 (see Figure 1 ) The decorative shell 105 is sleeved on the circumferential side surface of the grip portion 104 to prevent the screws and other structures on the grip portion 104 from being exposed and affecting the appearance.

[0040] In one embodiment, the trigger switch 20 is fixed to the second circuit board 62, which is located below the trigger portion 312 of the button assembly 30. The trigger switch 20 includes a body 21 and a cantilever spring piece 22 connected to the body 21. When the spring piece 22 is pressed by the trigger portion 312, it will deflect and ultimately cause the trigger switch 20 to be triggered. After the body 311 of the button assembly 30 returns to its initial position, the spring piece 22 returns to its original position under the action of its own elastic force.

[0041] In one embodiment, the base 32 of the button assembly 30 includes a substrate 321. A through hole 322 is provided on the first side surface (i.e., the top surface in the Figure 8 viewing angle) of the substrate 321. Two spaced-apart side plates 323 are protruded on the first side surface and are located on both sides of the through hole 322. In one embodiment, a positioning portion 324 protrudes from the outer surface of one side plate 323. The housing is provided with a receiving groove, specifically, a receiving groove 1011 is provided on the inner side wall of the first half shell 101 (see Figure 3 ). The positioning portion 324 is exactly received in the receiving groove 1011 to position the base 32 relative to the housing 10, that is, except in the direction of inserting and pulling out the positioning portion 324, the positioning portion 324 cannot move relative to the first half shell 101. The outer surface of the other side plate 323 of the base 32 abuts against the second half shell 102. In this way, in the direction of inserting and pulling out the positioning portion 324, the base 32 is clamped between the first half shell 101 and the second half shell 102. In this way, the base 32 is restricted in all directions, so that it is fixed to the housing 10. It can be understood that the fixing method of the base 32 is not limited to the foregoing situation, and other conventional connection means can be used according to actual needs, such as gluing, hot melt connection, etc.

[0042] Reference Figure 7 , in one embodiment, the body 311 of the button 31 is generally an elongated rotating body. The portion of the body 311 near the top end is exposed outside the chute of the housing 10. A guiding groove 314 extending along its length direction is provided at a position near the bottom end of the body 311. The body 311 passes through the through hole 322 on the base 32. In Figure 7 the viewing angle shown, the body 311 can move up or down relative to the base 32 in the vertical direction. In addition, the size of the through hole 322 is larger than the radial size of the body 311, so that the body 311 can swing relative to the base 32 within a certain range.

[0043] In one embodiment, two spaced-apart fixing blocks 325 are provided on a second side of the substrate 321 opposite to the first side. Through holes 326 are provided in both of the two fixing blocks 325. Two ends of a shaft 34 are respectively received in the through holes 326, and thus the shaft 34 is fixed to the two fixing blocks 325. The shaft 34 passes through a guiding slot 314 of the body 311. In this way, the body 311 of the button 31 can move relative to the base 32, but it cannot be separated from the base 32, that is, the body 311 of the button 31 is movably connected to the base 32 in a manner having two degrees of freedom. Since the base 32 is fixed in the housing 10, the body 311 of the button 31 is movably connected to the housing 10 in a manner having two degrees of freedom. In this embodiment, the swinging of the body 311 relative to the base 32 within a certain range means that the body 311 can actually rotate relative to the housing 10. It can be understood that in other embodiments, the body 311 can be configured to be able to slide in two directions relative to the housing 10, that is, after being subjected to a thrust force, the body 311 can slide from the initial position to the first position, and then slide from the first position to the second position.

[0044] In one embodiment, the elastic member 33 is a cylindrical helical spring, which is sleeved on the circumferential side surface of the body 311 of the button 31. In Figure 7 terms of perspective, the top end of the elastic member 33 abuts against the triggering portion 312 of the button 31, the bottom end of the elastic member 33 abuts against the first side of the substrate 321, and the elastic member 33 is in a compressed state. In this way, the elastic member 33 can apply an upward thrust force to the triggering portion 312, so that the body 311 remains in the initial position under normal conditions.

[0045] In one embodiment, the bottom end of the elastic member 33 not only needs to abut against the first side of the substrate 321, but also cannot move relative to the substrate 321. Therefore, the base 32 further includes a barrel portion 327 protruding from the first side of the substrate 321. The barrel portion 327 communicates with the through hole 322 of the substrate 321. The inner side surface of the barrel portion 327 is substantially flush with the inner side surface of the through hole 322. The body 311 first passes through the barrel portion 327 and then through the through hole 322. The bottom end of the elastic member 33 is tightly sleeved on the outer side surface of the barrel portion 327. In this way, the bottom end of the elastic member 33 is fixed to the substrate 321 of the base 32. Through such a structure, after the body 311 of the button 31 swings from the initial position to the first position relative to the base 32, since the bottom end of the elastic member 33 is fixed to the substrate 321 of the base 32, and other parts of the elastic member 33 follow the movement of the body 311, the elastic member 33 is bent. If the external force from the user acting on the body 311 disappears at this time, the elastic member 33 begins to recover from the bent state, thereby driving the body 311 to swing back from the first position to the initial position.

[0046] In one embodiment, the triggering portion 312 of the button 31 includes a fixing portion 3121 and a cantilever 3122. The fixing portion 3121 is fixed to the circumferential side surface of the main body 311, and the cantilever 3122 is fixed to the fixing portion 3121. The extending direction of the cantilever 3122 is inclined relative to the main body 311. When the main body 311 is in the initial position, the end of the cantilever 3122 is above the end of the elastic piece 22 of the trigger switch 20 that is connected to the main body 21. When the main body 311 moves to the first position, the end of the cantilever 3122 is above the free end of the elastic piece 22 of the switch 20. At this time, if the user applies pressure to the main body 311, the main body 311 moves toward the inside of the housing 10, driving the end of the triggering portion 311 to move toward the free end of the elastic piece 22 of the trigger switch 20. The end of the triggering portion 312 will finally contact the free end of the elastic piece 22 and drive it to deflect, thereby triggering the trigger switch 20.

[0047] In one embodiment, a limiting member 35 is further fixed to the main body 311 of the button 31. The limiting member 35 is generally a bent square plate, and its length and width are both larger than the length and width of the sliding groove 11 of the housing 10. The limiting member 35 is located above the triggering portion 312. It is located inside the housing 10 and faces the sliding groove 11. In this way, the limiting member 35 blocks the sliding groove 11 from the inside of the housing 10, so that the user can only see the limiting member 35 from the outside of the housing 10. This can prevent the components inside the housing 10 from being seen by the user through the sliding groove 11, which is beneficial to ensuring the appearance of the power tool 100. When the main body 311 is in the initial position, the limiting member 35 abuts against the inner surface of the housing 10. This can prevent some particulate matters from entering the inside of the housing 10 through the sliding groove 11, and can also prevent the main body 311 from being overly exposed outside the sliding groove 11 due to the thrust of the elastic member 33.

[0048] From the above description, it can be seen that the main body 311 of the button 31 is indirectly connected to the housing 10 in a manner having two degrees of freedom. The elastic member 33 applies a thrust to the main body 311 to keep it in the initial position under normal conditions. During use, the user first pushes the main body 311 to move along the sliding groove 11 of the housing 10 until the main body 311 abuts against the other end of the sliding groove 11. Then the user applies pressure to the main body 311, and the main body 311 moves toward the inside of the housing 10. The triggering portion 312 follows the main body 311 to move toward the trigger switch 20. During this process, the triggering portion 312 will contact the elastic piece 22 of the trigger switch 20 and push it to deflect until the trigger switch 20 is triggered. During this process, the elastic member 33 first bends and then is compressed. When the user releases the main body 311, the elastic member 33 rebounds and drives the main body 311 to return from the second position to the initial position.

[0049] In one embodiment, since the head 103 houses a driving device and a transmission device and the transmission device is connected to an execution module (such as the blade of a cutting machine and related protective covers, etc.), the total weight of the head 103 and its related components is greater than or even much greater than the total weight of the holding part 104 and its related components. In this case, the center of gravity of the power tool 10 is located within the range defined by the head 103. If the button 31 of the button assembly 30 is far from the center of gravity of the power tool 10, it means that the holding position of the user on the holding part 104 is further away from the center of gravity of the power tool 10, which requires the user to apply more force to keep the power tool 10 stable. Therefore, the distance between the button 31 and the center of gravity of the power tool 100 is less than the distance between the trigger switch 20 and the center of gravity of the power tool 100. Such an arrangement is conducive to the button 31 being closer to the center of gravity of the power tool 10. In Figures 1 to 3 this, it is reflected that the button 31 is located between the head 103 and the trigger switch 20 along the length direction of the holding part 104. From this perspective, when the body 311 of the button 31 is pushed towards the first position, it moves towards the head 103.

[0050] The execution module of the power tool 100 (such as the blade of a cutting machine) is connected to the transmission shaft of the transmission device. When replacing / installing the execution module, if the transmission shaft rotates freely, it may bring inconvenience to the above-mentioned replacement / installing operation. To solve this problem, the power tool 100 further includes a locking structure 70, which can lock the transmission shaft, thus facilitating the user's operation of replacing / installing the execution module.

[0051] Specifically, referring to Figures 9 to 11 , the driving device 40 includes a rotating motor 41, which is housed in the second half shell 102 and fixed to the first half shell 101 by screws. The transmission device 50 includes an output shaft 51, a first gear 52 coaxially fixed to the output shaft 51, and a second gear 53 coaxially fixed to the motor shaft 411 of the rotating motor 41. The second gear 53 meshes with the first gear 52. The motor shaft 411 can drive the second gear 53 to rotate, and the second gear 53 then drives the first gear 52 to rotate. Finally, the first gear 52 drives the output shaft 51 to rotate.

[0052] In one embodiment, the transmission device 50 further includes a bracket 54 and an end cap 55. The bracket 54 is received in the first half shell 101 and can be fixed to the first half shell 101 by screws. The end cap 55 is located at one end of the first half shell 101 and can be fixed to the second half shell 102 by screws. It should be noted that the end cap 55 actually also forms a part of the outer shell 10. In this case, the first half shell 101, the second half shell 102 and the end cap 55 together form the outer shell 10. The bracket 54 includes a substrate 541 that is generally disc-shaped. The substrate 541 is provided with a through hole for the motor shaft 411 of the motor 41 to pass through. The second gear 53 is fixed to the portion of the motor shaft 411 passing through the through hole. The end cap 55 is generally a cylinder with an open end, and it has a receiving space that provides sufficient receiving space for the motor shaft 411, the first gear 52, the second gear 53, and other structures protruding from the substrate 541 of the bracket 54.

[0053] In one embodiment, the end cap 55 further includes a receiving cavity 551 that communicates with the aforementioned receiving space and passes through the closed end 552 of the end cap 55. The transmission device 50 further includes a first bearing 561 and a second bearing 562. The first bearing 561, the second bearing 562, and the output shaft 51 are all received in the receiving cavity 551. Among them, the first bearing 561 and the second bearing 562 are both connected to the output shaft 51 and are both fixed in the receiving cavity 551. The first bearing 561 and the second bearing 562 provide support for the output shaft 51, so that the output shaft 51 can rotate freely in the receiving cavity 551. Among them, one end of the output shaft 51 axially extends with a first connecting shaft 511. The first connecting shaft 511 passes through the inner ring of the first bearing 561, and the first connecting shaft 511 rotates together with the inner ring of the first bearing 561. The first gear 52 is fixed to the connecting shaft. The other end of the output shaft 51 is provided with a receiving hole. One end of a second connecting shaft 57 is fixed in the receiving hole. An execution module (such as the blade of a cutting machine) is fixed to the second connecting shaft 57, and the second connecting shaft 57 can rotate synchronously with the output shaft 51, thereby driving the execution module to rotate.

[0054] In one embodiment, the second connecting shaft 57 includes a first shaft segment 571, a second shaft segment 572, and a third shaft segment 573 that are connected to each other. The end of the first shaft segment 571 is fixed in the receiving hole of the output shaft 51, and the inner ring of the second bearing 562 is sleeved on the first shaft segment 571. With such a structure, the output shaft 51 is supported by the first bearing 561 and the second bearing 562, and it can freely rotate in the cavity 551 of the end cover 55, thereby driving the connected first shaft segment 571 to rotate. In this embodiment, the cross-section of the third shaft segment 573 is non-circular, and the actuator module is provided with a through hole of a corresponding shape, so that the actuator module can just be sleeved on the third shaft segment 573. In this way, the actuator module can rotate together with the third shaft segment 573. A nut is connected to the end of the third shaft segment 573, and the nut tightly abuts against the actuator module to prevent it from detaching from the third shaft segment 573.

[0055] In one embodiment, a groove 512 is provided on the circumferential side surface of the output shaft 51. The extending direction of the groove 512 is parallel to the axial direction of the output shaft 51, and the groove 512 extends from one end of the output shaft 51 to the other end. In this embodiment, 4 grooves 512 are uniformly provided on the circumferential side surface of the output shaft 51. It can be understood that the number of grooves 512 can be selected according to actual needs in other embodiments, and is not limited to the foregoing situation.

[0056] The locking structure 70 is disposed close to the actuator module (such as the blade of a cutting machine), so that it is convenient for the user to operate the locking structure 70 first when replacing / installing the actuator module. In one embodiment, the locking structure 70 includes a locking rod 71 and a spring-loaded locking button 72. The locking rod 71 is slidably connected to the housing 10, specifically, slidably connected to the end cover 55. The bottom end surface of the locking rod 71 faces the circumferential side surface of the output shaft 51. The spring-loaded locking button 72 is fixed to the top end of the locking rod 71. The spring-loaded locking button 72 can drive the locking rod 71 to move from an unlocked position towards the circumferential side surface of the output shaft 51 until it moves to a locked position when being pressed. In the locked position, the bottom end of the locking rod 71 is received in a groove 512, which can prevent the output shaft 51 from rotating relative to the end cover 55. At this time, the second connecting shaft 57 coaxially connected to the output shaft 51 will not rotate, thus facilitating the user to replace / install the actuator module.

[0057] For example, when the execution module needs to be replaced, the user needs to unscrew the nut at the end of the third shaft segment 573. However, the freely rotatable third shaft segment 573 is clearly not conducive to the user unscrewing the nut from the third shaft segment 573. Therefore, at this time, the user can press the spring-loaded locking button 72. When the end of the locking lever 71 contacts the circumferential side surface of the output shaft 51, the user needs to manually rotate the execution module to rotate the second connecting shaft 57, thereby driving the output shaft 51 to rotate. The purpose of doing this is to determine whether the end of the locking lever 71 is received in a groove 512. If the end of the locking lever 71 is not received in a groove 512, the user needs to continue to manually rotate the execution module until the output shaft 51 rotates to a suitable position so that the end of the locking lever 71 enters a groove 512, thereby locking the output shaft 51 and, in turn, locking the third shaft segment 573 together. After the user releases the spring-loaded locking button 72, the spring-loaded locking button 72 returns to the unlocked position under the action of the elastic force. In this unlocked position, the bottom end of the locking lever 71 leaves the groove 512. At this time, the output shaft 51 is no longer locked and can rotate freely.

[0058] In one embodiment, a protrusion 542 protrudes from the base plate 541 of the bracket 54, and two spaced-apart protrusions 543 protrude from the end of the protrusion 542. The spring-loaded locking button 72 includes a button 721 and a spring 722. A receiving hole 553 is provided on the circumferential side surface of the end cap 55, and a through hole for the locking lever 71 to pass through is provided at the bottom of the receiving hole 553. The button 721 is partially received in the receiving hole 553, and the portion not received in the button 721 is exposed on the circumferential side surface of the end cap 55. The locking lever 71 passes through the space between the two protrusions 543, and the spring 722 is sleeved on the locking lever 71. The two ends of the spring 722 are respectively in contact with the button 721 and the two protrusions 543. In one embodiment, a snap ring 711 is provided on the circumferential side surface of the locking lever 71. The snap ring 711 is located on the side of the two protrusions 543 opposite to the spring 722. In Figure 10 the perspective view, the snap ring 711 is located below the two protrusions 543, and the spring 722 is located above the two protrusions 543. The spring 722 is in a compressed state and exerts a thrust on the button 721, while the snap ring 711 is in contact with the protrusions 543, thereby preventing the locking lever 71 from detaching from the bracket 54. With such a structure, the locking lever 71 and the button 721 can be slidably connected to the end cap 55 and will not detach from the end cap 55.

[0059] Reference Figures 10 to 12, in one embodiment, the power tool 100 further includes a speed control assembly 80. The speed control assembly 80 includes a knob 81, a gear 82, and a rotary potentiometer 83. The knob 81 is rotatably connected to the housing 10. The inner sidewall of the knob 81 is provided with teeth 811 that mesh with the gear 82. The rotary potentiometer 83 is fixed in the housing 10 and is electrically connected to a controller that controls the driving device 40. The gear 82 is coaxially fixed to the rotating shaft of the rotary potentiometer 83. When the knob 81 rotates, it can drive the gear 82 to rotate, and the rotating shaft can rotate synchronously with the gear 82. The controller adjusts the output of the driving device 40 according to the resistance change of the potentiometer caused by the rotation of the rotating shaft. For example, the controller can adjust the rotational speed of the motor shaft 411 of the motor 41 according to the resistance change.

[0060] In one embodiment, the first half-shell 101 and the second half-shell 102 form a cylindrical hollow cylinder 106. The gear 82 and the rotary potentiometer 83 are disposed in the cylindrical hollow cylinder 106. The knob 81 is rotatably sleeved on the outer circumferential surface of the cylindrical hollow cylinder 106. The outer circumferential surface of the cylindrical hollow cylinder 106 is provided with a narrow groove 1061, and the gear 82 is partially exposed through the narrow groove 1061, thereby allowing the teeth 811 of the knob 81 to mesh with the gear 82. In one embodiment, a third circuit board 63 is disposed in the cylindrical hollow cylinder 106. The third circuit board 63 is electrically connected to the first circuit board 61 or the second circuit board 62 provided with the controller that controls the driving device 40. The rotary potentiometer 83 is disposed on the third circuit board 63.

[0061] In one embodiment, the power tool 100 further includes a display module 90. The display module 90 is used to display rotational speed information, power information, etc. The display module 90 is partially received in the cylindrical hollow cylinder 106 and is detachably connected to the cylindrical hollow cylinder 106. For example, the cylindrical hollow cylinder 106 is provided with a plurality of card slots 1062 at a position near the top of its outer circumferential surface, and the circumferential sidewall of the display module 90 is provided with a plurality of hooks 91. The plurality of hooks 91 are snapped into the card slots 1062 to detachably connect the display module 90 to the cylindrical hollow cylinder 106. An annular groove 107 is formed between the top end of the display module 90 and the cylindrical hollow cylinder 106. A protruding portion 812 protrudes from the inner side surface of the knob 81, and the protruding portion 812 is exactly received in the annular groove 107. The interaction between the protruding portion 812 and the annular groove 107 can prevent the knob 81 from detaching from the cylindrical hollow cylinder 106 of the housing 10 and allows the knob 81 to rotate relative to the cylindrical hollow cylinder 106. In one embodiment, the axis of the cylindrical hollow cylinder 106 and the axis of the holding portion 104 intersect, and the angle between them can be 90 degrees or less than 90 degrees. Such an arrangement is beneficial for the user's line of sight to naturally focus on the display module 90 when grasping the holding portion 104, facilitating viewing the information displayed on the display module 90 during use.

[0062] In one embodiment, the housing 10 further includes a guide groove 108 surrounding the cylindrical hollow tube 106. A convex block 813 protrudes from the bottom end of the knob 81, and the convex block 813 is received in the guide groove 108 and can move along the guide groove 108. In this embodiment, the guide groove 108 is not a circular groove that is end-to-end connected. It has two spaced-apart ends. When the convex block 813 abuts against any one of the ends, this will prevent the knob 81 from further rotating, thereby feedbacking to the user that the knob 81 has been rotated to its limit position.

[0063] Reference Figure 13 and Figure 14 , in one embodiment, the power tool 100 is a cutting machine, and its execution module is a circular blade. In order to prevent high-speed debris generated during cutting from splashing onto the user, the power tool 100 further includes a first shield 109 and a second shield 110. The first shield 109 is connected to the end cap 55, and the second shield 110 is connected to the first shield 109.

[0064] In one embodiment, a circular boss 553 protrudes from the closed end 552 of the end cap 55, and the receiving cavity 551 passes through the boss 553 (see Figure 11)。The first shield 109 is provided with a through hole 1091, and the first shield 109 is sleeved on the boss 553 through the through hole 1091. A first clamping plate 554 is fixed on the end face of the boss 553, and a second clamping plate 555 is also fixed on the closed end 552 of the end cover 55. The first clamping plate 554 faces the inner side surface of the first shield 109, and the second clamping plate 554 faces the outer side surface of the first shield 109. An elastic gasket 556 sleeved on the boss 553 is arranged between the first clamping plate 554 and the inner side surface of the first shield 109. The elastic gasket 556 undergoes elastic deformation under the clamping of the first clamping plate 554 and the first shield 109, and then the elastic gasket 556 exerts a thrust on the first shield 109, which makes the outer side surface of the first shield 109 closely adhere to the second clamping plate 554. In one embodiment, a plurality of positioning protrusions 557 are arranged on the second clamping plate 554, and a plurality of positioning pits 1092 are arranged on the outer side surface of the first shield 109. The number of the positioning pits 1092 is more than that of the positioning protrusions 557, and the plurality of positioning protrusions 557 are respectively received in the positioning pits 1092. Due to the thrust exerted by the elastic gasket 556 on the first shield 109, the plurality of positioning protrusions 557 are stably stuck in the positioning pits 1092. When the user needs to adjust the first shield 109, an external force needs to be applied to the first shield 109 to overcome the thrust of the elastic gasket 556. At this time, the first shield 109 can rotate relative to the end cover 55 until the first shield 109 rotates to the desired position. At this time, the plurality of positioning protrusions 557 have respectively entered another group of positioning pits 1092. After the user stops applying an external force to the first shield 109, the elastic gasket 556 exerts a thrust on the first shield 109, so that the plurality of positioning protrusions 557 are stably stuck in this group of positioning pits 1092, thereby preventing the first shield 109 from rotating relative to the end cover 55.

[0065] In one embodiment, the second shield 110 is detachably sleeved on the circumferential outer surface of the first shield 109. The second shield 110 and the first shield 109 together can cover half of the circular blade. The arc-shaped inner surface formed by the second shield 110 and the first shield 109 around the edge of the circular blade can guide the debris generated when cutting the object to fly towards the bottom surface, thus avoiding high-speed debris flying towards the user.

[0066] In one embodiment, cantilever elastic pieces 111 are arranged at two circumferential ends of the second shield 110. Hooks 112 are arranged on the inner surface of the elastic pieces 111. The two hooks 112 are respectively stuck on the circumferential ends of the first shield 109, thereby detachably sleeving the second shield 110 on the circumferential outer surface of the first shield 109.

[0067] Reference Figure 2, the heat generated by the electronic components on the first circuit board 61 during operation is greater than that generated by the electronic components on the second circuit board 62 during operation. In other words, the electronic components with high heat generation during operation are arranged on the first circuit board 61, while the electronic components with low heat generation during operation are arranged on the second circuit board 62. The purpose of this arrangement is to enable the power tool 100 to have good heat dissipation ability, which will become clear and obvious through the following description. In one embodiment, a plurality of components with large heat generation such as metal oxide semiconductor field effect transistors (MOSFETs) are provided on the first circuit board 61. The MOSEFET is used to control the motor 41, and its arrangement between the motor 41 and the end of the head 103 is also beneficial to reducing the wire connection path between the first circuit board 61 and the motor 41. A microcontroller (MCU), a charge and discharge management circuit, etc. are provided on the second circuit board 62.

[0068] Reference Figure 10 , the drive device 40 further includes a fan 42 coaxially connected to the motor shaft 411 of the motor 41. The fan 42 faces the first end of the motor 41, and the fan 42 is located between the drive device 40 and the transmission device 50. The fan 42 can rotate together with the motor shaft 411, and the rotation of the fan 42 drives the air flow to flow through the motor 41, thereby taking away the heat generated by the motor 41 during operation. That is to say, due to the presence of the fan 42, an air flow channel is formed in the head 103 of the housing 10. Therefore, an air outlet 1031 is formed at the end of the head 103 away from the fan 42 (see Figure 3 ), and the air flow flowing through the motor 41 finally leaves the housing 10 through the air outlet 1031 and is discharged to the outside of the housing 10.

[0069] In one embodiment, the first circuit board 61 faces the second end of the motor 41 opposite to the first end, and is located between the motor 41 and the end of the head 103. That is to say, the first circuit board 61 is located at a position close to and facing the air outlet 1031 in the air flow channel in the head 103, so that the air flow flowing through the motor 41 will flow through the first circuit board 61, thereby taking away the heat generated by the first circuit board 61 during operation, and the air flow is finally discharged to the outside of the housing 10 through the air outlet 1031.

[0070] In one embodiment, the cross-section of the head 103 is circular, and the first circuit board 61 is generally circular. In this way, the internal space of the head 103 can be fully utilized, the area of the first circuit board 61 can be made as large as possible, which is beneficial to heat dissipation and placing more electronic components. A through hole is provided at the center position of the first circuit board 61, which is more conducive to the air flow passing through. The first circuit board 61 can be fixed to the second end of the motor 41 by screws.

[0071] In one embodiment, the first circuit board 61 is also connected to a heat dissipation plate 64 (seeFigure 10 ) On the front side of the first circuit board 61, there are electronic components that generate a high amount of heat during operation. The heat dissipation plate 64 is attached to the back side of the first circuit board 61, and the heat dissipation plate 64 faces the air outlet 1031. The heat dissipation plate 64 can be fixed to the first circuit board 61 by screws or glue. The heat dissipation plate 64 is beneficial to the dissipation of heat generated by the electronic components on the first circuit board 61.

[0072] The reason for arranging the electronic components with low heat generation during operation on the second circuit board 61 located in the holding portion 104 is that a decorative shell 105 is sleeved on the circumferential side of the holding portion 104. Setting heat dissipation holes on the decorative shell 105 will affect the appearance. Since the heat generation of the electronic components on the second circuit board 61 during operation is low, not setting heat dissipation holes has a relatively small impact on the heat dissipation of the power tool 100. In this way, the two requirements of appearance beauty and heat dissipation can be taken into account at the same time.

[0073] By arranging the electronic components on two physically independent first circuit board 61 and second circuit board 62, it is beneficial to make full use of the space inside the housing 10 and disperse the arrangement of the electronic components, which is beneficial to reducing the distribution density of the electronic components on the first circuit board 61 and the second circuit board 62, and this is beneficial to heat dissipation. Arranging the first circuit board 61 near the air outlet 1031 is beneficial to heat dissipation, and arranging the first circuit board 61 downstream of the air flow channel and near the air outlet 1031 can further improve the heat dissipation efficiency.

[0074] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An electric tool, characterized in that: include: A housing, wherein the housing is provided with a slide groove; A trigger switch, the trigger switch is arranged inside the housing; and A button assembly, the button assembly includes a button and an elastic member, the button is movably connected to the shell, the button includes a body and a trigger portion connected to the body and located inside the shell, one end of the body passes through the slide groove and is exposed, the elastic member is arranged inside the shell, the body can move from an initial position to a first position along the slide groove after being pushed, the body can move toward the inside of the shell after being subjected to pressure and move with the trigger portion to a second position that can trigger the trigger switch, and the elastic member is configured to drive the body to move from the second position to the initial position.

2. The electric tool according to claim 1, characterized in that: The button assembly also includes a base arranged inside the shell, one end of the elastic member conflicts with the base, the other end of the elastic member conflicts with the body or the trigger part, and the elastic member is in a compressed state.

3. The electric tool according to claim 2, characterized in that: The button assembly also includes an axis, the base includes a substrate, the elastic member is in conflict with a first side surface of the substrate, the first side surface of the substrate is provided with a through hole, the body of the button passes through the through hole, the body of the button is provided with a guide groove, the second side surface of the substrate opposite to the first side surface is provided with two fixed blocks spaced apart from each other, and the axis is fixed to the two fixed blocks and passes through the guide groove.

4. The electric tool according to claim 1, characterized in that: The button assembly also includes a limiting member, which is fixed to the body and located inside the shell. When the body is located at the first position, the limiting member conflicts with the inner surface of the shell.

5. The electric tool according to claim 3, characterized in that: A side plate is protruded from the first side surface of the base plate, a positioning portion is protruded from the side plate, and the shell is provided with a receiving groove, the positioning portion is received in the receiving groove to position the base relative to the shell.

6. The electric tool according to claim 1, characterized in that: The distance between the button and the center of gravity of the electric tool is smaller than the distance between the trigger switch and the center of gravity of the electric tool.

7. The electric tool according to claim 1, characterized in that: It also includes a driving device arranged in the housing, a transmission device connected to the driving device, and a locking structure, wherein the transmission device includes an output shaft, and the locking structure is configured to lock the output shaft.

8. The electric tool according to claim 7, characterized in that: A groove is provided on the circumferential side of the output shaft, and the locking structure includes a locking rod and a spring-loaded locking button, the locking rod is slidably connected to the housing, the bottom end of the locking rod faces the circumferential side of the output shaft, and the spring-loaded locking button is fixed with respect to the top end of the locking rod. After being subjected to pressure, the spring-loaded locking button can drive the locking rod to move from an unlocked position toward the circumferential side of the output shaft until it moves to a locked position, in which the bottom end of the locking rod is accommodated in the groove, and the spring-loaded locking button is configured to return to the unlocked position under the action of its own elastic force, in which the bottom end of the locking rod leaves the groove.

9. The electric tool according to claim 1, characterized in that: It also includes a driving device, a controller and a speed regulating component arranged in the shell. The controller is electrically connected to the driving device. The speed regulating component includes a knob, a gear and a rotary potentiometer. The knob is rotatably connected to the shell. The inner wall of the knob is provided with teeth meshing with the gear. The rotary potentiometer is fixed in the shell and electrically connected to the controller. The gear is coaxially fixed to the rotating shaft of the rotary potentiometer. When the knob is rotated, the gear can be driven to rotate. The rotating shaft can synchronously follow the rotation of the gear. The controller adjusts the output of the driving device according to the resistance change of the potentiometer caused by the rotation of the rotating shaft.

10. The electric tool according to claim 9, characterized in that: It also includes setting a display module, the shell includes a cylindrical hollow cylinder, the display module is partially accommodated in the cylindrical hollow cylinder and is detachably connected to the cylindrical hollow cylinder, the display module and the top of the cylindrical hollow cylinder form an annular groove, the inner side surface of the knob protrudes with a protrusion, the knob is sleeved on the outer side surface of the cylindrical hollow cylinder, and the protrusion is accommodated in the annular groove, thereby preventing the knob from detaching from the shell.

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