Electric power tool and water drilling machine

Abstract

The utility model relates to an electric tool and water drill, electric tool includes: the casing, the shoulder rest, one of casing with The shoulder rest is equipped with the accommodation cavity, and the other is equipped with the convex structure, the accommodation cavity is used to accommodate the convex structure, first connecting structure is connected in the accommodation cavity, second connecting structure is connected in the convex structure, wherein, when the shoulder rest is installed in the casing, the first connecting structure is limited with second connecting structure cooperation, to prevent the shoulder rest from separating from the casing, when the shoulder rest is disassembled, the shoulder rest can separate from the casing when the strength is greater than the limited cooperation of force. The utility model discloses electric tool, through the assembly structure optimization of casing and shoulder rest, realize the detachable connection of casing and shoulder rest, and the shoulder rest is convenient to assemble and disassemble, and, the assembly of casing and shoulder rest is hidden arrangement, improves the beautiful degree of electric tool appearance.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to an electric tool and a water drill. Background Technology

[0002] Power tools are mainly used in construction and decoration projects, municipal and road and bridge projects, and home renovations. Power tools are usually large and heavy. To reduce the burden on the user's hands, power tools are usually equipped with shoulder supports. The user supports the weight of the power tool by leaning against the shoulder support, thus supporting the reaction force.

[0003] The shoulder rests of existing power tools are usually installed on the power tool housing with screws. If the shoulder rest needs to be replaced, the user needs to use a screwdriver to remove and install the screws. The user needs to bring their own screwdriver. Moreover, due to the limited force-bearing area and the length of the force-bearing and fastening surfaces of the shoulder rest, the screw tightening operation during the installation of the shoulder rest is relatively troublesome. The shoulder rest is inconvenient to install and remove, and it is time-consuming and laborious. Utility Model Content

[0004] Based on the aforementioned deficiencies in the existing technology, the purpose of this utility model is to provide a power tool that optimizes the assembly structure of the housing and shoulder support to achieve a detachable connection between the housing and shoulder support, making it convenient to install and remove the shoulder support. Furthermore, the assembly point of the housing and shoulder support is concealed, improving the aesthetic appearance of the power tool.

[0005] Therefore, the present invention provides the following technical solution.

[0006] This utility model provides an electric tool, the electric tool comprising:

[0007] chassis;

[0008] Shoulder support, one of the housing and the shoulder support is provided with a receiving cavity, and the other is provided with a protruding structure, the receiving cavity is used to receive the protruding structure;

[0009] A first connecting structure is connected to the receiving cavity;

[0010] A second connecting structure is connected to the protruding structure;

[0011] Wherein, when the shoulder support is installed on the housing, the first connecting structure and the second connecting structure are mutually restrictive to prevent the shoulder support from detaching from the housing;

[0012] When the force required to disassemble the shoulder support is greater than the force required to limit the fit, the shoulder support can detach from the housing.

[0013] Optionally, when the shoulder support is mounted on the housing, the protruding structure engages with the receiving cavity.

[0014] Optionally, the cross-section of the receiving cavity is annular.

[0015] Optionally, the number of the protrusions is at least two, and each of the protrusions is connected to at least one of the second connection structures.

[0016] Optionally, one of the first connecting structure and the second connecting structure is a magnet and the other is a magnetic component, and the first connecting structure and the second connecting structure are magnetically attracted to each other.

[0017] Optionally, both the first connecting structure and the second connecting structure are protrusions;

[0018] The second connecting structure and the protruding structure form a snap-fit ​​structure, which is fastened to the first connecting structure.

[0019] Optionally, the first connecting structure has a first serrated portion on the side opposite to the cavity wall of the receiving cavity, and the second connecting structure has a second serrated portion on the side opposite to the protruding structure.

[0020] The first serrated portion and the second serrated portion have teeth that can mesh, and they can disengage under external force.

[0021] Optionally, the first connecting structure is integrally formed in the receiving cavity, and the second connecting structure is integrally formed in the protruding structure.

[0022] Optionally, the first connecting structure is provided with a first wedge-shaped surface, and the second connecting structure is provided with a second wedge-shaped surface;

[0023] The first wedge surface and the second wedge surface mate to prevent the shoulder support from detaching from the housing.

[0024] Optionally, the first wedge-shaped surface includes a first concave surface and a first convex surface, and the second wedge-shaped surface includes a second concave surface and a second convex surface;

[0025] The first concave surface is engaged with the second convex surface, and the first convex surface is engaged with the second concave surface.

[0026] Optionally, the receiving cavity is located on the housing, and the protruding structure is located on the shoulder support.

[0027] Optionally, the shoulder support is detachably connected to the rear wall of the housing, and the length direction of the shoulder support extends along the front-rear direction of the housing.

[0028] This utility model also provides a water drilling machine, the water drilling machine comprising:

[0029] The casing has a water inlet for connecting to an external water source;

[0030] Shoulder support, one of the housing and the shoulder support is provided with a receiving cavity, and the other is provided with a protruding structure, the receiving cavity is used to receive the protruding structure;

[0031] A first connecting structure is connected to the receiving cavity;

[0032] A second connecting structure is connected to the protruding structure;

[0033] When the shoulder support is installed on the housing, the protruding structure is engaged with the receiving cavity, and both the first connecting structure and the second connecting structure are protrusions; the second connecting structure and the protruding structure form a snap-fit ​​structure, and the snap-fit ​​structure is engaged with the first connecting structure.

[0034] Optionally, the shoulder support is detachably connected to the rear wall of the housing, and the length direction of the shoulder support extends along the front-rear direction of the housing.

[0035] This utility model has the following technical effects:

[0036] This utility model provides an electric tool that optimizes the assembly structure of the housing and shoulder rest. Through the limiting cooperation of the first connecting structure and the second connecting structure, the housing and shoulder rest are detachably connected, making it easy to install and remove the shoulder rest. Furthermore, the first connecting structure is connected to the receiving cavity, and the second connecting structure is connected to the protruding structure, which is housed in the receiving cavity. This can hide the assembly point of the first connecting structure and the second connecting structure. In other words, the assembly point of the housing and the shoulder rest is hidden, thereby improving the aesthetic appearance of the electric tool. Attached Figure Description

[0037] Figure 1 This is a perspective view of the power tool of this utility model;

[0038] Figure 2 This is a partial three-dimensional structural diagram of the power tool of this utility model;

[0039] Figure 3 This is a partial structural cross-sectional view of the power tool in the first embodiment of the present invention;

[0040] Figure 4 This is an exploded view of a partial structure of the power tool in the first embodiment of the present invention;

[0041] Figure 5 These are partial structural cross-sectional views of the housing in the first and third embodiments of this utility model.

[0042] Figure 6 This is an exploded view of a partial structure of the power tool in the second embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the assembly structure in the second embodiment of the present invention, showing the shoulder support and the housing fastening together.

[0044] Figure 8 This is an exploded view of a partial structure of the power tool in the third embodiment of this utility model;

[0045] Figure 9 This is a schematic diagram of the assembly structure of the first connecting structure and the second connecting structure in the third embodiment of this utility model.

[0046] Explanation of reference numerals in the attached figures

[0047] 100. Power tools;

[0048] 1. Housing; 11. Receiving cavity; 12. Handle;

[0049] 2. Shoulder support; 21. Raised structure; 22. Abutment part;

[0050] 3. First connecting structure; 31. First serrated portion; 32. First wedge-shaped surface; 321. First concave surface; 322. First convex surface;

[0051] 4. Second connecting structure; 41. Second serrated portion; 42. Second wedge-shaped surface; 421. Second concave surface; 422. Second convex surface;

[0052] 5. Water inlet interface. Detailed Implementation

[0053] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0054] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0055] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0056] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0058] The following is based on Figures 1 to 9 This utility model describes the power tool in detail.

[0059] In this embodiment, the power tool 100 includes a housing 1, a motor, a reduction mechanism, and an output shaft (not shown in the figure). The motor, reduction mechanism, and output shaft are all installed inside the housing 1. One end of the output shaft extends to the outside of the housing 1 for mounting a tool head (such as a drill bit). The motor, reduction mechanism, and output shaft are sequentially connected in a transmission manner. The rotation drive output by the motor is reduced in speed by the reduction mechanism and then transmitted to the output shaft so that the output shaft drives the tool head to perform operations.

[0060] like Figures 1 to 9As shown, the power tool 100 also includes a shoulder rest 2, a first connecting structure 3, and a second connecting structure 4. One of the housing 1 and the shoulder rest 2 is provided with a receiving cavity, and the other is provided with a protruding structure. The receiving cavity is used to receive the protruding structure. Specifically, the housing 1 may be provided with a receiving cavity 11, and the shoulder rest 2 may be provided with a protruding structure 21, with the receiving cavity 11 used to receive the protruding structure 21. Alternatively, the housing 1 may be provided with a protruding structure (not shown in the figure), and the shoulder rest 2 may be provided with a receiving cavity (not shown in the figure), with the receiving cavity used to receive the protruding structure.

[0061] The first connecting structure 3 is connected to the receiving cavity, and the second connecting structure 4 is connected to the protruding structure. When the shoulder support 2 is installed on the housing 1, the protruding structure is received in the receiving cavity, and the first connecting structure 3 and the second connecting structure 4 are mutually restrictive to prevent the shoulder support 2 from detaching from the housing 1, thus ensuring the shoulder support 2 is stably installed on the housing 1. When the force required to remove the shoulder support 2 exceeds the force of the restrictive fit, the shoulder support 2 can detach from the housing 1, allowing for smooth removal of the shoulder support 2.

[0062] The above technical solution optimizes the assembly structure of the housing 1 and the shoulder support 2. Through the limiting cooperation of the first connecting structure 3 and the second connecting structure 4, the housing 1 and the shoulder support 2 are detachably connected, making the shoulder support 2 easy to install and remove. Furthermore, the first connecting structure 3 is connected to the receiving cavity, and the second connecting structure 4 is connected to the protruding structure 21. The protruding structure is received in the receiving cavity, which can hide the assembly point of the first connecting structure 3 and the second connecting structure 4. That is, the assembly point of the housing 1 and the shoulder support 2 is hidden, thereby improving the aesthetic appearance of the power tool 100.

[0063] In one embodiment, since the housing 1 houses components such as a motor, reduction gear, and output shaft, its overall weight and size are relatively large. Therefore, if the housing 1 experiences a collision, the resulting force will be relatively large. Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, in this design, the protruding structure 21 is placed on the shoulder support 2, and the receiving cavity 11 is placed on the housing 1. In this way, compared with the design of placing the protruding structure on the housing 1, when the shoulder support 2 is removed, the shoulder support 2 is small and less prone to collision, or the force generated by the collision is relatively small, which can avoid or reduce the probability of damage to the protruding structure.

[0064] In one implementation, such as Figure 1 , Figure 2As shown, the shoulder support 2 is detachably connected to the rear wall of the housing 1, and the length of the shoulder support 2 extends along the front-rear direction of the housing 1. The shoulder support 2 is used to rest against the front of the user's shoulder. Specifically, the bottom of the housing 1 is provided with a handle 12, and the end of the shoulder support 2 opposite to the housing 1 is provided with an abutment part 22. When the user operates the power tool 100, the user holds the handle 12 and lifts the power tool 100. The tool head of the power tool 100 presses against the workpiece, and the front of the user's shoulder presses forward against the abutment part 22 to press the power tool 100 against the workpiece. In this way, the front-rear vibration force generated by the power tool 100 during operation will be partially transmitted to the user's shoulder through the shoulder support 2 to reduce the burden on the user's hand.

[0065] The following description uses the example of "the housing 1 has a receiving cavity 11 and the shoulder support 2 has a protruding structure 21" to illustrate the specific structure and positional relationship of the protruding structure, receiving cavity, first connecting structure 3 and second connecting structure 4 in the embodiment of "the housing 1 has a receiving cavity 11 and the shoulder support 2 has a protruding structure 21" and will not be repeated here.

[0066] In one implementation, such as Figure 3 and Figure 5 As shown, when the shoulder support 2 is installed on the housing 1, the protruding structure 21 snaps into the receiving cavity 11. The protruding structure 21 and the receiving cavity 11 are tightly fitted, which can further improve the firmness of the shoulder support 2 assembly. The snapping between the protruding structure 21 and the receiving cavity 11 is as follows: Figure 4 , Figure 5 and Figure 8 As shown, it can be that the two are connected one by one, or it can be, as... Figure 6 As shown, there are multiple protrusions 21 and one receiving cavity 11. The multiple protrusions 21 are spaced apart along the circumference of the receiving cavity 11, and the multiple protrusions 21 together form a snap-fit ​​structure, which snaps into the receiving cavity 11.

[0067] In one embodiment, the cross-section of the receiving cavity 11 is annular, including but not limited to regular or irregular annular shapes such as circular, square, or polygonal annular shapes. In this way, the receiving cavity 11 can surround the protruding structure 21, improving the concealment effect of the assembly point of the first connecting structure 3 and the second connecting structure 4.

[0068] In one implementation, such as Figure 4 , Figure 6 and Figure 8As shown, the number of protruding structures 21 is at least two, that is, the number of protruding structures 21 can be two, three, four, or even more. Each protruding structure 21 is connected to at least one second connecting structure 4, that is, the number of second connecting structures 4 connected to each protruding structure 21 can be two, three, or more. In order to simplify the structure and reduce the assembly difficulty, preferably, each protruding structure is connected to one second connecting structure 4 by 21. In this solution, by increasing the number of protruding structures 21, the firmness of the assembly between the shoulder support 2 and the housing 1 can be improved.

[0069] Furthermore, to facilitate balanced force distribution on the protruding structures 21, in one specific embodiment, the number of receiving cavities 11 is equal to the number of protruding structures 21, and they are arranged in a one-to-one correspondence. All the protruding structures 21 can be arranged in a circumferential array, such as... Figure 4 As shown, all the protruding structures 21 can also be divided into two symmetrical groups of protruding structures 21, and the two groups of protruding structures 21 are symmetrically arranged about the central axis of the motor output shaft. In another specific embodiment, as shown... Figure 6 As shown, when there is only one receiving cavity 11, all the protruding structures 21 are evenly spaced apart along the circumference of the receiving cavity 11.

[0070] In this application, the limiting fit between the first connecting structure 3 and the second connecting structure 4 includes, but is not limited to, magnetic adsorption fit, snap-fit ​​fit, and wedge surface fit. This application details three of these solutions, as detailed in the first, second, and third embodiments below.

[0071] First Implementation Method

[0072] The following is based on Figures 3 to 5 The electric tool in the first embodiment of this utility model is described in detail.

[0073] In this embodiment, such as Figure 3 and Figure 4 As shown, one of the first connecting structure 3 and the second connecting structure 4 is a magnet, and the other is a magnetic component. The magnetic component includes a magnet or a magnetic metal component, which can be iron, an iron-containing alloy, a cobalt-containing alloy, or a nickel-containing alloy. The first connecting structure 3 and the second connecting structure 4 are magnetically attracted to each other. The magnet and the magnetic component can be installed into the corresponding first connecting structure 3 and second connecting structure 4 by injection molding or interference fitting. In this solution, the magnetic attraction between the magnet and the magnetic component results in a simple assembly structure, convenient processing, and cost control.

[0074] In one specific implementation, such as Figures 3 to 5As shown, the housing 1 has multiple receiving cavities 11, and the shoulder support 2 has multiple protruding structures 21. The number of receiving cavities 11, protruding structures 21, first connecting structures 3, and second connecting structures 4 are equal (e.g., four each). One of the first connecting structures 3 and the second connecting structures 4 is a magnet, and the other is a magnetic component. Each receiving cavity 11 is fitted with a magnet or magnetic component by injection molding or interference fitting. Each protruding structure 21 is fitted with a magnet or magnetic component by injection molding or interference fitting. Of course, at least one of the receiving cavities 11 and the protruding structures 21 must be fitted with a magnet. When installing the shoulder support 2, the protruding structure 21 snaps into the corresponding receiving cavity 11 until the first connecting structure 3 and the second connecting structure 4 are magnetically attracted. At this point, the shoulder support 2 is installed in place. In this design, the two-stage connection of snap-fit ​​and magnetic attraction helps to improve the assembly firmness of the shoulder support 2 and enhances its safety during use.

[0075] Second Implementation Method

[0076] The following is based on Figures 6 to 7 The electric tool in the second embodiment of this utility model is described in detail.

[0077] In this embodiment, such as Figure 6 and Figure 7 As shown, both the first connecting structure 3 and the second connecting structure 4 are protrusions. The second connecting structure 4 and the protrusions form a snap-fit ​​structure. Since the protrusions are projected onto the housing 1 or the shoulder support 2, they possess a certain elasticity, thus the snap-fit ​​structure has a certain deformation capability. The snap-fit ​​structure is interlocked with the first connecting structure 3. In this design, the shoulder support 2 and the housing 1 are assembled by snap-fitting, resulting in a simple assembly structure, convenient processing, and cost control.

[0078] The following text uses the example of "the housing 1 has a receiving cavity 11 and the shoulder support 2 has a protruding structure 21" to illustrate the specific structure and positional relationship of the protruding structure, receiving cavity, first connecting structure 3, and second connecting structure 4 in the embodiment of "the housing 1 has a receiving cavity 11 and the shoulder support 2 has a protruding structure 21" as an example. Therefore, it will not be repeated here.

[0079] like Figure 6 and Figure 7As shown, the protruding structure 21 protrudes from the shoulder support 2. The protruding structure 21 has a certain elasticity, thus the snap-fit ​​structure formed by the second connecting structure 4 and the protruding structure 21 has a certain deformation capability. When the shoulder support 2 is installed on the housing 1, the second connecting structure 4 abuts against the first connecting structure 3 along the disengagement direction of the shoulder support 2. Thus, the first connecting structure 3 prevents the shoulder support 2 from detaching from the housing 1 by preventing the second connecting structure 4 from moving backward. When the external force for disassembling the shoulder support 2 is greater than the restriction of the first connecting structure 3 on the second connecting structure 4, the snap-fit ​​structure undergoes a certain deformation, allowing the second connecting structure 4 to smoothly detach from the first connecting structure 3, thereby smoothly removing the shoulder support 2. In one specific embodiment, there is one receiving cavity 11 and multiple protruding structures 21. Regarding the arrangement of the first connecting structure 3, it can be formed by a ring-shaped protrusion on the inner wall of the receiving cavity 11, or by multiple protrusions on the inner wall of the receiving cavity 11 corresponding one-to-one with the positions of the second connecting structures 4, thus forming multiple first connecting structures 3.

[0080] In one implementation, such as Figure 6 and Figure 7 As shown, the first connecting structure 3 has a first serrated portion 31 on the side opposite to the cavity wall of the receiving cavity 11, and the second connecting structure 4 has a second serrated portion 41 on the side opposite to the protruding structure 21. The teeth of the first serrated portion 31 and the second serrated portion 41 can mesh, and the first serrated portion 31 and the second serrated portion 41 can disengage under external force. Specifically, when disassembling the shoulder support 2, the second serrated portion 41 will jump along the tooth surface of the first serrated portion 31. The first serrated portion 31 will increase the resistance to the disassembly process of the second connecting structure 4, increase the difficulty of disassembling the shoulder support 2, and thus improve the firmness of the shoulder support 2 assembly.

[0081] In one implementation, such as Figure 6 and Figure 7 As shown, the first connecting structure 3 is integrally formed in the receiving cavity 11, and the second connecting structure 4 is integrally formed in the protruding structure 21, which simplifies processing, reduces assembly steps, and makes the structure more stable.

[0082] Third Implementation Method

[0083] The following is based on Figures 8 to 9 The electric tool in the third embodiment of this utility model is described in detail.

[0084] In this embodiment, such as Figure 8 and Figure 9 As shown, the first connecting structure 3 is provided with a first wedge-shaped surface 32, and the second connecting structure 4 is provided with a second wedge-shaped surface 42. The first wedge-shaped surface 32 and the second wedge-shaped surface 42 are in surface-to-surface contact to prevent the shoulder support 2 from detaching from the housing 1. Specifically, the frictional force formed by the contact of the two wedge-shaped surfaces is used to prevent the shoulder support 2 from detaching.

[0085] In one embodiment, the first wedge-shaped surface 32 includes a first concave surface 321 and a first convex surface 322, and the second wedge-shaped surface 42 includes a second concave surface 421 and a second convex surface 422. The first concave surface 321 and the second convex surface 422 are fitted together, and the first convex surface 322 and the second concave surface 421 are fitted together. Specifically, both the first wedge-shaped surface 32 and the second wedge-shaped surface 42 are concave and convex surfaces, so that the first wedge-shaped surface 32 and the second wedge-shaped surface 42 can fit together, thereby preventing the shoulder support 2 from detaching. In a specific embodiment, the receiving cavity 11 is disposed on the housing 1, and the protruding structure 21 is disposed on the shoulder support 2. The first concave surface 321 and the first convex surface 322 are sequentially distributed along the detachment direction of the shoulder support 2, and the second convex surface 422 and the second concave surface 421 are sequentially distributed along the detachment direction of the shoulder support 2.

[0086] It should be understood that the limiting cooperation between the first connecting structure 3 and the second connecting structure 4 in this application is not limited to the first, second, and third embodiments described above.

[0087] In this application, the power tool 100 includes, but is not limited to, a water drill, an electric drill, and an electric screwdriver. The water drill is a tool that uses a hollow drill barrel to drill large-diameter holes in a workpiece. Because the drill barrel needs to drill large holes and the workpieces used by the water drill (such as concrete) are usually hard, the water drill requires high power output. During drilling, the drill barrel heats up due to high-speed friction. Therefore, water cooling is used to cool the drill barrel in a timely manner during water drill operation. Specifically, the output shaft of the water drill has a hollow structure to form a flow channel. One end of the flow channel of the output shaft is connected to an external water pipe. Thus, during water drill operation, the external water pipe supplies water to the flow channel of the output shaft, and the water flows from the outlet end of the flow channel to the drill barrel to cool it. The water drill has a large overall size and is heavy, so it is usually equipped with a shoulder rest 2 to reduce the burden on the user's hands.

[0088] In one implementation, such as Figure 6 and Figure 7 As shown, the water drill includes a housing 1 and a shoulder support 2. One of the housing 1 and the shoulder support 2 has a receiving cavity, while the other has a protruding structure. The receiving cavity is used to accommodate the protruding structure. A first connecting structure 3 is connected to the receiving cavity, and a second connecting structure 4 is connected to the protruding structure. When the shoulder support 2 is installed on the housing 1, the protruding structure is engaged with the receiving cavity. Both the first connecting structure 3 and the second connecting structure 4 are protrusions. The second connecting structure 4 and the protruding structure form a snap-fit ​​structure, which is engaged with the first connecting structure 3. The shoulder support 2 has a simple assembly structure, is easy to process, and is beneficial for cost control.

[0089] Furthermore, such as Figure 2As shown, the shoulder support 2 is detachably connected to the rear wall of the housing 1, and the length of the shoulder support 2 extends along the front-rear direction of the housing 1. The shoulder support 2 is used to rest against the front of the user's shoulder.

[0090] It should be understood that in this article, "front" refers to the direction in which the power tool 100 is facing the workpiece during operation, and "back" refers to the opposite direction to "front".

[0091] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. A power tool, characterized in that, The power tools include: chassis; Shoulder support, one of the housing and the shoulder support is provided with a receiving cavity, and the other is provided with a protruding structure, the receiving cavity is used to receive the protruding structure; A first connecting structure is connected to the receiving cavity; A second connecting structure is connected to the protruding structure; Wherein, when the shoulder support is installed on the housing, the first connecting structure and the second connecting structure are mutually restrictive to prevent the shoulder support from detaching from the housing; When the force required to disassemble the shoulder support is greater than the force required to limit the fit, the shoulder support can detach from the housing.

2. The power tool according to claim 1, characterized in that, When the shoulder support is installed on the housing, the protruding structure engages with the receiving cavity.

3. The power tool according to claim 1, characterized in that, The cross-section of the receiving cavity is annular.

4. The power tool according to claim 1, characterized in that, The number of the protrusions is at least two, and each of the protrusions is connected to at least one of the second connection structures.

5. The power tool according to any one of claims 1-4, characterized in that, One of the first connecting structure and the second connecting structure is a magnet, and the other is a magnetic component. The first connecting structure and the second connecting structure are magnetically attracted to each other.

6. The power tool according to any one of claims 1-4, characterized in that, Both the first connecting structure and the second connecting structure are protrusions; The second connecting structure and the protruding structure form a snap-fit ​​structure, which is fastened to the first connecting structure.

7. The power tool according to claim 6, characterized in that, The first connecting structure has a first serrated portion on the side opposite to the cavity wall of the receiving cavity, and the second connecting structure has a second serrated portion on the side opposite to the protruding structure. The first serrated portion and the second serrated portion have teeth that can mesh, and they can disengage under external force.

8. The power tool according to claim 6, characterized in that, The first connecting structure is integrally formed in the receiving cavity, and the second connecting structure is integrally formed in the protruding structure.

9. The power tool according to any one of claims 1-4, characterized in that, The first connecting structure is provided with a first wedge-shaped surface, and the second connecting structure is provided with a second wedge-shaped surface; The first wedge surface and the second wedge surface mate to prevent the shoulder support from detaching from the housing.

10. The power tool according to claim 9, characterized in that, The first wedge-shaped surface includes a first concave surface and a first convex surface, and the second wedge-shaped surface includes a second concave surface and a second convex surface; The first concave surface is engaged with the second convex surface, and the first convex surface is engaged with the second concave surface.

11. The power tool according to any one of claims 1-4, characterized in that, The receiving cavity is located on the housing, and the protruding structure is located on the shoulder support.

12. The power tool according to any one of claims 1-4, characterized in that, The shoulder support is detachably connected to the rear wall of the housing, and the length of the shoulder support extends along the front-rear direction of the housing.

13. A water drilling machine, characterized in that, The water drilling rig includes: The casing has a water inlet for connecting to an external water source; Shoulder support, one of the housing and the shoulder support is provided with a receiving cavity, and the other is provided with a protruding structure, the receiving cavity is used to receive the protruding structure; A first connecting structure is connected to the receiving cavity; A second connecting structure is connected to the protruding structure; When the shoulder support is installed on the housing, the protruding structure is engaged with the receiving cavity, and both the first connecting structure and the second connecting structure are protrusions; the second connecting structure and the protruding structure form a snap-fit ​​structure, and the snap-fit ​​structure is engaged with the first connecting structure.

14. The water drilling rig according to claim 13, characterized in that, The shoulder support is detachably connected to the rear wall of the housing, and the length of the shoulder support extends along the front-rear direction of the housing.

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