Power tool

Abstract

The utility model provides a kind of electric tool, comprising: shell;Inner shell, the inner shell is housed in the shell;Driving assembly, the driving assembly is set in the inner shell;Mounting head, the mounting head is exposed from the shell and is driven by the driving assembly;And first sealing element, the first sealing element part or all is arranged between the inner surface of the shell and the outer surface of the inner shell.The first sealing element can prevent the gap between the shell and the inner shell from entering the inside of shell, so that electric tool has good waterproofness.

Description

Technical Field

[0001] This utility model relates to power tools, specifically to a power tool with a sealed and waterproof structure. Background Technology

[0002] Power tools are common items, such as power cleaning brushes, electric drills, and electric screwdrivers. Taking a power cleaning brush as an example, it's a tool that uses electricity to drive the brush head at high speed or sonic vibrations to assist in cleaning. It aims to reduce the intensity of housework and improve cleaning efficiency and effectiveness. While existing power tools can meet basic needs, providing new power tools is useful and necessary, especially those that improve water resistance. Utility Model Content

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

[0004] To solve the above-mentioned technical problems, the present invention provides an electric tool, comprising: a housing; an inner housing housed within the housing; a drive assembly disposed within the inner housing; a mounting head exposed outside the housing and driven by the drive assembly; and a first seal, which is partially or entirely disposed between the inner surface of the housing and the outer surface of the inner housing.

[0005] Optionally, the first seal is an O-ring that fits over the outer surface of the inner shell and is sandwiched between the inner surface of the outer shell and the outer surface of the inner shell.

[0006] Optionally, it also includes a control circuit board and a button, the drive assembly being electrically connected to the control circuit board, the control circuit board having a switch, and the button being aligned with the switch; the button being movably connected to the outer shell or inner shell, and the button and the outer shell or inner shell being integrally formed; or, the button being movably connected to the outer shell, and a second seal being provided between the button and the switch, the second seal being integrally formed with the outer shell or inner shell.

[0007] Optionally, it also includes a display module that is exposed outside the housing and disposed between the housing and the inner housing, and a third seal is provided between the display module and the housing or the inner housing.

[0008] Optionally, the display module includes a display module body and a protective cover that shields the display module body. The inner shell has an annular groove that receives one end of the protective cover, and the third seal is disposed in the annular groove.

[0009] Optionally, it also includes a control circuit board with a connector, the housing having a receiving hole in which the connector is partially received, and a fourth seal between the connector and the side of the receiving hole.

[0010] Optionally, the drive assembly includes a motor and an output shaft connected to the motor shaft, the circumferential surface of the output shaft being fitted with a fifth seal, the seal being clamped between the circumferential surface of the output shaft and the inner surface of the inner housing.

[0011] Optionally, the drive assembly includes a motor, an output shaft connected to the motor shaft, and a transmission assembly. The transmission assembly is disposed in the inner housing and is connected to the output shaft and the mounting head, transmitting the rotational motion output by the output shaft to the mounting head.

[0012] Optionally, it also includes a connecting shaft, which is fixed in the inner housing. The transmission assembly includes a bracket, a first gear, a second gear, and a third gear. The bracket and the first gear are rotatably connected to the connecting shaft. The second gear and the third gear are respectively fixed to the output shaft and the mounting head. The first gear meshes with the second gear and the third gear respectively.

[0013] Optionally, it also includes a button and a stop block exposed outside the housing. The button is movably connected to the housing, and the stop block is movably connected to the connecting shaft. The bracket is provided with a first receiving space, and the inner surface of the inner housing is provided with a second receiving space. The stop block is located in the space formed by the first and second receiving spaces. The stop block is connected to the button and is provided with a locking part. Both the first and second receiving spaces are provided with locking part mating parts. The stop block can switch between a first position and a second position. When the stop block is in the first position, the locking part engages with the locking part mating parts in the first and second receiving spaces. When the stop block is in the second position, the locking part engages only with the locking part mating parts in the first receiving space.

[0014] The present invention has the following advantages: the first sealing element can prevent the material entering the gap between the outer shell and the inner shell from entering the interior of the outer shell, thus giving the power tool good waterproof performance. 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 an exploded view of a power tool according to an embodiment of the present utility model.

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

[0019] Figure 4 This is an exploded view of a power tool according to an embodiment of the present invention, wherein the housing of the power tool is omitted.

[0020] Figure 5 This is an exploded view of a power tool according to an embodiment of the present invention, wherein the housing of the power tool is omitted.

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

[0022] Figure 7 This is a cross-sectional view of a power tool according to an embodiment of the present invention.

[0023] Figure 8 This is a cross-sectional view of a power tool according to an embodiment of the present utility model.

[0024] Figure 9 for Figure 7 Enlarged view of section I.

[0025] Figure 10 for Figure 2 Enlarged view of section A.

[0026] Figure 11 for Figure 4 Enlarged view of section D.

[0027] Figure 12 for Figure 8 A magnified view of section K in the middle.

[0028] Figure 13 for Figure 8 Enlarged view of section J in the middle.

[0029] Figure 14 for Figure 10 Enlarged view of section M in the middle.

[0030] Figure 15 for Figure 8 A magnified view of section L in the middle.

[0031] Figure 16 for Figure 2 Enlarged view of section B.

[0032] Figure 17 for Figure 5 Enlarged view of section F in the middle.

[0033] Figure 18 for Figure 7 Enlarged view of section H in the middle.

[0034] Figure 19 for Figure 17 A magnified view of section N.

[0035] Figure 20 This is a perspective sectional view of the upper inner housing of a power tool according to an embodiment of the present utility model.

[0036] Figure 21 This is a perspective view of a bracket for a power tool according to an embodiment of the present invention.

[0037] Figure 22 for Figure 4 Enlarged view of section E in the middle.

[0038] Figure 23 for Figure 18 A magnified view of the O section. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] refer to Figure 1-3 In one embodiment, the power tool 100 includes a housing 10, an inner housing 20, and a drive assembly 30 (see...). Figures 4 to 6 ), mounting head 40 and first seal 51 (see Figure 6 and Figure 9 The inner housing 20 and the drive assembly 30 are housed within the outer housing 10, and the mounting head 40 is exposed outside the outer housing 10 and driven by the drive assembly 30. The first seal 51 is partially or entirely disposed between the inner surface of the outer housing 10 and the outer surface of the inner housing 20. In one embodiment, the power tool 100 is an electric cleaning brush. The mounting head 40 is used for detachable connection to a brush head (not shown). It is understood that the power tool 100 in other embodiments is other types of power tools, such as an electric drill, an electric screwdriver, etc.

[0042] With the above-described structure, the first seal 51 can prevent the gap between the outer shell 10 and the inner shell 20 from entering the interior of the outer shell 10, thus giving the power tool 100 good waterproof performance.

[0043] In one embodiment, the outer casing 10 includes a front outer casing 11 and a rear outer casing 12, which are connected to the inner casing 20 by fasteners (e.g., screws). It is understood that in other embodiments, the front outer casing 11 and the rear outer casing 12 may be connected to each other or to the inner casing 20 by other conventional means of connection.

[0044] In one embodiment, the first seal 51 is an O-ring (hereinafter referred to as O-ring 51) that fits onto the outer surface of the inner shell 20 and is sandwiched between the inner surface of the outer shell 10 and the outer surface of the inner shell 20. In one embodiment, the inner surface of the outer shell 10 and / or the outer surface of the inner shell 20 are provided with a receiving groove for receiving the O-ring 51. The receiving groove can hold the O-ring 51 in place, thereby partially positioning the O-ring 51 between the inner surface of the outer shell 10 and the outer surface of the inner shell 20, preventing it from moving relative to the outer shell 10 and the inner shell 20. Figure 9 As shown, the O-ring 51 undergoes elastic deformation after being sandwiched between the inner surface of the outer shell 10 and the outer surface of the inner shell 20, thereby forming a barrier that divides the gap between the inner surface of the outer shell 10 and the outer surface of the inner shell 20 into two parts, namely... Figure 9 Gap 201 and gap 202 in the middle. Figure 9 From the perspective shown, gaps 201 and 202 are located on the left and right sides of the O-ring 51, respectively. It can be understood that in another embodiment, neither the inner surface of the outer shell 10 nor the outer surface of the inner shell 20 is provided with a receiving groove for the O-ring 51; in this case, all O-rings 51 are disposed between the inner surface of the outer shell 10 and the outer surface of the inner shell 20.

[0045] In one embodiment, the front outer shell 11 and the rear outer shell 12 extend in the same direction and meet end to end to form a space for accommodating the inner shell 20. The opposite ends of the front outer shell 11 and the rear outer shell 12 contact each other to form a joint seam 101. (See figure...) Figure 9 From this perspective, the joint 101 is located to the left of the O-ring 51. In some operating environments, liquid may enter between the inner surface of the housing 10 and the outer surface of the inner housing 20 through the joint 101. If liquid enters... Figure 9 Gap 201 will eventually be blocked by O-ring 51 and will not be able to enter gap 202, thus achieving the purpose of waterproofing. Of course, liquid may enter from the joint 101 into the space between the inner surface of the outer shell 10 and the outer surface of the inner shell 20, and may also enter into other areas such as... Figure 9 The gap between the front outer shell 11 and the inner shell 20 on the left side of the joint 101. For this purpose, additional sealing and waterproofing structures are required, which will be described in detail later.

[0046] In one embodiment, the power tool 100 also includes a control circuit board 61 (see...). Figure 6 ) and battery module 62 (see Figure 5 ). refer to Figure 3 , Figure 4 and Figure 5 The inner shell 20 includes a front inner shell 21 and a rear inner shell 22. The rear inner shell 22 includes a first half-shell 221 and a second half-shell 222, which together form a receiving space for accommodating the control circuit half 61 and the battery module 62. The rear inner shell 22 formed by connecting the first half-shell 221 and the second half-shell 222 is generally cylindrical. In one embodiment, the cross-sections of the first half-shell 221 and the second half-shell 222 are both generally arc-shaped, with the first end of the first half-shell 221 and the first end of the second half-shell 222 abutting each other, and the second end 2211 of the first half-shell 221 (see...) Figure 10 ) and the second half-shell 222 second end 2221 (see Figure 10 The control circuit board 61 is formed in the rear inner housing 22 by means of through holes spaced at a certain distance from each other, thereby exposing at least a portion of the circuit board 61. These through holes allow electronic components, pins, etc., on the control circuit board 61 to pass through. Without these through holes, the internal accommodating space of the rear inner housing would need to be increased to accommodate the aforementioned electronic components, pins, etc. In other words, by providing these through holes, the rear inner housing 22 can accommodate the control circuit board 61 within a limited accommodating space.

[0047] In one embodiment, both the outer shell 10 and the inner shell 20 are generally elongated hollow cylindrical structures, and the control circuit board 61 extends along the length of the outer shell 10 and the inner shell 20. Specifically, the control circuit board 61 is partially housed in the rear inner shell 22, and the remaining portion is housed in the front inner shell 21. (See reference...) Figure 6 In one embodiment, a switch 63 is provided on the control circuit board 61. Specifically, the switch 63 is located in the portion of the control circuit board 61 housed within the front inner housing 21. Corresponding to the switch 63, the power tool 100 also includes a button 64 (see...). Figure 1 The button 64 is aligned with the switch 63 and is movably connected to the housing 10 or the inner housing 20. With this configuration, the user can start / stop the drive assembly 30 by pressing the switch 63.

[0048] For waterproofing purposes, in one embodiment, the button 64 and the housing 10 are integrally formed, for example, by secondary injection molding. In this case, the housing 10 is made of rigid plastic, while the button 64 is made of flexible plastic, allowing it to elastically deform when pressed by the user to trigger the switch 63. After the user stops pressing, the button 64 returns to its initial position. With this construction, the button 64 and the housing 10 are integrally formed without gaps, thus preventing liquid from entering the housing 10.

[0049] In another embodiment, the button 64 and the inner shell 20 are integrally formed, for example, by secondary injection molding. In this case, the outer shell 10 is made of rigid plastic, while the button 64 is made of flexible plastic, allowing it to elastically deform when pressed by the user and trigger the switch 63. After the user stops pressing, the button 64 can return to its initial position. In this embodiment, the outer shell 10 needs to be provided with a through hole for the button 64 to be exposed, specifically a through hole 111 provided in the front outer shell 11 (see...). Figure 2 ).

[0050] refer to Figure 11 and Figure 12 In another embodiment, a second seal 52 is provided between the button 64 and the switch 63. This second seal 52 is integrally formed with the inner shell 20, for example, through secondary injection molding. In this case, the second seal 52 is made of flexible plastic, and the button 64 is movably connected to the outer shell 10. Figure 12 From the user's perspective, the button 64 is located above the second seal 52 and protrudes from the through hole 111 on the housing 10, while the second seal 52 is located above the switch 63. When the button 64 is pressed by the user, it moves downward, which in turn pushes the second seal 52 to undergo elastic deformation, thereby triggering the switch 63. Figure 11 Although it is shown that the inner shell 20 has a through hole 23 (which is provided in the front inner shell 21) and the second seal 52 is separated from the inner shell 20, Figure 11 This is merely illustrative; since the second seal 52 and the inner shell 20 are integrally formed, the through hole 23 is covered by the second seal 52. With this configuration, there are no gaps between the second seal 52 and the inner shell 20. Even if liquid can enter the interior of the outer shell 10 through the gap between the button 64 and the outer shell 10, the liquid cannot enter the interior of the inner shell 20, thereby preventing the electronic components inside the inner shell 20 from being affected or even damaged. Understandably, in another embodiment, the second seal 52 and the outer shell 10 are integrally formed, for example, by secondary injection molding.

[0051] In yet another embodiment, the power tool 100 also includes a display module 70 (see [link to relevant documentation]). Figure 1The display module 70 is exposed outside the outer casing 10 and disposed between the outer casing 10 and the inner casing 20. A third sealing element 53 is provided between the display module 70 and the outer casing 10 or the inner casing 20 (see...). Figure 13 The display module 70 is used to display information related to the working status of the power tool 100, such as speed, battery level, and temperature. In this embodiment, the housing 10 needs to be provided with a through hole for the display module 70 to be exposed, specifically a through hole 112 provided in the front housing 11 (see...). Figure 1 ).

[0052] refer to Figure 11 and Figure 13 In one embodiment, the display module 70 includes a display module body 71 and a protective cover 72 covering the display module body 71. The inner shell 20 has an annular groove 24 for receiving one end of the protective cover 72, and the third sealing member 53 is disposed in the annular groove 24. In this embodiment, the inner shell 24 is provided with a through hole 25, which is specifically disposed in the front inner shell 21 and is opposite to the through hole 112 on the outer shell 10. The annular groove 24 is disposed around the through hole 25. In this embodiment, a circuit board 73 is disposed at the bottom of the display module body 71, and the circuit board 73 covers the through hole 25. The protective cover 72 is made of a light-transmitting material and has an open structure at one end, with a receiving cavity 721 at its bottom end. The display module body 71 and the circuit board 73 are received in the receiving cavity 721, and the open end of the receiving cavity 721 is received in the annular groove 24. In this embodiment, the third seal 53 fills the gap between the opening end of the cavity 721 and the annular groove 24 with waterproof adhesive. With this structure, even if liquid enters the interior of the outer shell 10 through the gap between the protective cover 72 and the through hole 112 on the outer shell 10, the liquid entering the interior of the outer shell 10 cannot enter the interior of the inner shell 20 because the third seal 53 fills the gap between the opening end of the cavity 721 and the annular groove 24.

[0053] refer to Figure 8 , Figure 10 , Figure 14 and Figure 15 In one embodiment, the control circuit board 61 is further provided with a connector 65, and the housing 10 is provided with a receiving hole, specifically a receiving hole 121 provided on the rear housing 12 (see...). Figure 16The receiving hole 121 extends inward from the closed end of the rear housing 12, and the connector 65 is partially received within the receiving hole 121. A fourth seal 54 is provided between the connector 65 and the side of the receiving hole 121. In this embodiment, the connector 65 is a USB socket connector (e.g., a Type-C USB socket connector), which is electrically connected to the control circuit board 61 for establishing an electrical connection with an external power source to charge the battery module 62. In this embodiment, the fourth seal 54 is an O-ring fitted onto the outer side of the connector 65. The O-ring 54 is sandwiched between the inner surface of the receiving hole 121 on the outer side of the connector 65 and undergoes elastic deformation, thereby forming a barrier to isolate the opening end of the receiving hole 121 from the interior of the rear housing 12. Therefore, the O-ring 65 can prevent liquid entering from the opening end of the receiving hole 121 from entering the interior of the rear housing 12.

[0054] refer to Figure 17 , Figure 18 and Figure 19 In one embodiment, the drive assembly 30 includes a motor 31 and an output shaft 32 connected to the motor shaft of the motor 31. A fifth seal 55 is fitted onto the circumferential surface of the output shaft 32, and the seal 55 is clamped between the circumferential surface of the output shaft 32 and the inner surface of the inner housing 20. In another embodiment, a transmission device 33 is connected between the motor 31 and the output shaft 32. The input end of the transmission device 33 is connected to the motor shaft of the motor 31, and the output end of the transmission device 33 is connected to the output shaft 32. The transmission device 33 can transmit the rotational motion output from the motor shaft of the motor 31 to the output shaft 32.

[0055] refer to Figure 20In one embodiment, the front inner shell 21 is provided with a first receiving space 211, a second receiving space 212, and a through hole 213 connecting the first receiving space 211 and the second receiving space 212, wherein the open end of the first space 211 faces the rear inner shell 22. In this embodiment, the motor 31 and the transmission device 33 are received in the first receiving space 211, and the end of the output shaft 32 passes through the through hole 213 and is located in the second receiving space 211. That is, the output shaft 32 is partially located in the first receiving space 211 and partially located in the second receiving space 212. In this embodiment, the output shaft 32 is supported by a first bearing 34 and a second bearing 35. Specifically, both the first bearing 34 and the second bearing 35 are sleeved on the output shaft 32, with the first bearing 34 located in the through hole 213 and the second bearing 35 located in the first receiving space 211. In this embodiment, the fifth seal 55 is an annular piece sleeved on the output shaft 32 and is located between the first bearing 34 and the second bearing 35. The fifth seal 55 is made of a material capable of elastic deformation. It undergoes elastic deformation radially due to pressure from the output shaft 32 and the inner wall of the first receiving space 211, thus forming a barrier that isolates the first receiving space 211 and the second receiving space 212. Therefore, even if liquid enters the second receiving space 212 through the outer casing 10, it will be blocked by the fifth seal 55 and cannot enter the first receiving space 211.

[0056] refer to Figure 19 In one embodiment, the drive assembly 30 further includes a transmission assembly 36 disposed in the inner housing 20. The transmission assembly 36 is connected to the output shaft 32 and the mounting head 40 and transmits the rotational motion output by the output shaft 32 to the mounting head 40.

[0057] In one embodiment, the transmission assembly 36 is disposed within the second receiving space 212. Specifically, the transmission assembly 36 includes a bracket 37 and a connecting shaft 38, which is fixed within the second receiving space 212. Figure 20As shown, the top wall 2121 and bottom wall 2122 of the second receiving space 212 are both provided with receiving holes. The two ends of the connecting shaft 38 are respectively fixed in the receiving holes of the top wall 2121 and bottom wall 2122, and the extending direction of the connecting shaft 38 is perpendicular to the extending direction of the output shaft 32. The bracket 37 is rotatably connected to the connecting shaft 38. In one embodiment, the transmission assembly 36 further includes a first gear 391, a second gear 392, and a third gear 393. The first gear 391 is rotatably connected to the connecting shaft 38, and the second gear 392 and the third gear 393 are respectively fixed to the output shaft 32 and the mounting head 40. The first gear 391 meshes with the second gear 392 and the third gear 393. With this structure, the second gear 392 can rotate with the output shaft 32, the mounting head 40 can rotate with the third gear 393, and the first gear 391 can transmit the rotation from the second gear 392 to the third gear 393.

[0058] refer to Figure 21 In one embodiment, the bracket 37 includes a first sidewall 371, a second sidewall 372, and a third sidewall 373. The first sidewall 371 and the second sidewall 372 are generally parallel, and the third sidewall 373 is located between the first sidewall 371 and the second sidewall 372 and is connected to one end of the first sidewall 371 and one end of the second sidewall 372, respectively. Both the first sidewall 371 and the second sidewall 372 are provided with through holes that allow the connecting shaft 38 to pass through, thereby enabling the bracket 37 to be rotatably connected to the connecting shaft 38. In this embodiment, the first gear 39, the second gear 392, and the third gear 393 are all bevel gears. The end of the first gear 391 opposite to its teeth faces the first sidewall 371. The second gear 392 extends between the first sidewall 371 and the second sidewall 372 and meshes with the first gear 39. The end of the third gear 393 opposite to its teeth faces the third sidewall 373. The third sidewall 373 is provided with a through hole, and the connecting shaft connected to the third gear 393 passes through the through hole of the third sidewall 373. The mounting head 40 is fixed to the end of the connecting shaft opposite to the third gear 393.

[0059] refer to Figure 19 and Figure 22 In one embodiment, the power tool 100 further includes an exposed button 80 and a stop block 91 on the housing 10. The button 80 is movably connected to the housing 10, and the stop block 91 is movably connected to the connecting shaft 38. The bracket 37 is provided with a first receiving space 374 (see...). Figure 21The inner surface of the inner shell 20 is provided with a second receiving space 26. The stop block 91 is located in the space formed by the first receiving space 374 and the second receiving space 26. The stop block 91 is connected to the button 80. The stop block 91 is provided with a locking part 911. Both the first receiving space 374 and the second receiving space 26 are provided with locking part mating parts, namely locking part mating parts 375 and 261. The stop block 91 can switch between a first position and a second position. When the stop block 91 is in the first position, the locking part 911 engages with the locking part mating parts 375 and 261 in the first and second receiving spaces, thereby positioning the bracket 37. When the stop block 91 is in the second position, the locking part 911 engages only with the locking part mating part 375 in the first receiving space 374, thereby allowing the bracket 37 to rotate relative to the inner shell 20, thereby realizing the angle adjustment of the mounting head 40 relative to the outer shell 10.

[0060] In one embodiment, the first receiving space 374 is a receiving cavity disposed on the side of the second sidewall 372 opposite to the first sidewall 371. The power tool 100 also includes a positioning block 92, and the inner shell 20 is provided with a receiving hole for receiving the positioning block 92. The second receiving space 26 is a receiving cavity formed on the end of the positioning block 92 facing the bracket 37. Understandably, in another embodiment, the second receiving space 26 may be formed directly on the inner surface of the inner shell 20.

[0061] In one embodiment, the locking portion 911 of the stop block 91 is one or more protrusions extending from the circumferential side of the stop block 91, the locking portion mating portion 375 is one or more grooves formed in the first receiving space 374 of the bracket 37, and the locking portion mating portion 261 is one or more grooves formed in the second receiving space 26 of the positioning block 92. In one embodiment, the stop block 91 is slidably fitted onto the connecting shaft 38, which passes through the first receiving space 374 and the second receiving space 26. With this configuration, the stop block 91 can be movably received in the space formed by the first receiving space 374 and the second receiving space 26. Understandably, in another embodiment, the locking portion 911 is a groove recessed from the circumferential side of the stop block 91, while the locking portion mating portions 261 and 375 are protrusions.

[0062] In one embodiment, button 80 is connected to stop block 91 via push rod 93 passing through positioning block 92, i.e., both ends of push rod 93 are fixed to button 80 and stop block 91 respectively. When button 80 is pushed by the user, button 80 pushes push rod 93, which in turn pushes stop block 91 to slide along connecting shaft 38. In one embodiment, power tool 100 also includes an elastic element, such as spring 94 sleeved on connecting shaft 38, spring 94 being received in first receiving space 374 of bracket 37, with both ends of spring 94 abutting the bottom end of first receiving space 374 and stop block 91 respectively. With this configuration, stop block 91 is held in place by the pushing force of spring 94. Figure 23 In the first position shown, the locking part 911 engages with the locking engagement parts 375 and 261 in the first and second receiving spaces. The bracket 37 is positioned relative to the inner shell 20 and cannot rotate. That is, the mounting head 40 cannot rotate relative to the outer shell 10 at this time. When it is necessary to adjust the angle of the mounting head 40 relative to the outer shell 10, the user can press the button 80, causing the stop block 91 to be pushed away from the first position by the push rod 93. When the stop block 91 disengages from the second receiving space 26 and fully enters the second position in the first receiving space 374, the locking part 911 on the stop block 91 disengages from the locking engagement part 261, thereby freeing the bracket 37 from restriction. The user can then rotate the mounting head 40 to the desired position. Afterward, the user releases the press of the button 80, which causes the stop block 91 to move back under the push of the spring 94. Figure 23 In the first position shown, the locking part 911 engages with the locking parts 375 and 261 in the first and second receiving spaces, and the bracket 37 is positioned relative to the inner shell 20 and cannot rotate, thereby holding the mounting head 40 in the desired position. Understandably, in another embodiment, the spring 94 can be omitted; in this case, the stop block 91 is configured as a push-type locking structure, and when the button 80 is pressed, the stop block 91 is held in the second position. When it is necessary to hold the mounting head 40 in the desired position, the user needs to press the button 80 again, and the stop block 91 returns to the first position.

[0063] 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: shell; Inner shell, which is housed within the outer shell; A drive assembly disposed within the inner housing; The mounting head is exposed outside the housing and is driven by the drive assembly; as well as A first seal is disposed, either partially or entirely, between the inner surface of the housing and the outer surface of the inner housing.

2. The power tool according to claim 1, characterized in that, The first seal is an O-ring that fits onto the outer surface of the inner shell and is sandwiched between the inner surface of the outer shell and the outer surface of the inner shell.

3. The power tool according to claim 1, characterized in that, It also includes a control circuit board and a button, the drive assembly being electrically connected to the control circuit board, the control circuit board having a switch, and the button being aligned with the switch; The button is movably connected to the outer shell or inner shell, and the button and the outer shell or inner shell are integrally formed; or, the button is movably connected to the outer shell, and a second seal is provided between the button and the switch, and the second seal is integrally formed with the outer shell or inner shell.

4. The power tool according to claim 1, characterized in that, It also includes a display module that is exposed outside the outer casing and disposed between the outer casing and the inner casing, and a third seal is provided between the display module and the outer casing or the inner casing.

5. The power tool according to claim 4, characterized in that, The display module includes a display module body and a protective cover that shields the display module body. The inner shell has an annular groove that accommodates one end of the protective cover, and the third seal is disposed in the annular groove.

6. The power tool according to claim 1, characterized in that, It also includes a control circuit board with a connector, a housing with a receiving hole, a portion of which is received in the receiving hole, and a fourth seal between the connector and the side of the receiving hole.

7. The power tool according to claim 1, characterized in that, The drive assembly includes a motor and an output shaft connected to the motor shaft. A fifth seal is fitted onto the circumferential surface of the output shaft and is clamped between the circumferential surface of the output shaft and the inner surface of the inner housing.

8. The power tool according to claim 1, characterized in that, The drive assembly includes a motor, an output shaft connected to the motor shaft, and a transmission assembly. The transmission assembly is disposed in the inner housing and is connected to the output shaft and the mounting head, transmitting the rotational motion output by the output shaft to the mounting head.

9. The power tool according to claim 8, characterized in that, It also includes a connecting shaft, which is fixed in the inner housing. The transmission assembly includes a bracket, a first gear, a second gear, and a third gear. The bracket and the first gear are rotatably connected to the connecting shaft. The second gear and the third gear are respectively fixed to the output shaft and the mounting head. The first gear meshes with the second gear and the third gear respectively.

10. The power tool according to claim 9, characterized in that, It also includes a button and a stop block exposed outside the housing. The button is movably connected to the housing, and the stop block is movably connected to the connecting shaft. The bracket is provided with a first receiving space, and the inner surface of the inner housing is provided with a second receiving space. The stop block is located in the space formed by the first and second receiving spaces. The stop block is connected to the button and is provided with a locking part. Both the first and second receiving spaces are provided with locking part mating parts. The stop block can switch between a first position and a second position. When the stop block is in the first position, the locking part engages with the locking part mating parts in the first and second receiving spaces. When the stop block is in the second position, the locking part engages only with the locking part mating part in the first receiving space.

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