A base mechanism for a power tool

Abstract

The utility model relates to a base mechanism for electric tool, and the electric tool includes left casing and right casing that fold together. The base mechanism includes bottom shell, control panel subassembly and button subassembly, the bottom shell includes the snap ring flange that forms from the surface partial bulge, the left casing and right casing fold and hold the snap ring flang, and with the outer peripheral wall of snap ring flange complementary cooperation. The guide hole is formed at the center of snap ring flange, the control panel subassembly is located in the bottom shell, and the control panel subassembly wire passes along the guide hole. The left casing and right casing can accurately hold the snap ring flange after folding, and the left casing and right casing and the outer peripheral wall of snap ring flange are in the complementary cooperation state, ensure the stability and versatility of connection, and the same type base mechanism can be adapted to different electric tool casing.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a base mechanism for power tools. Background Technology

[0002] Power tools are used in construction sites and for repair and assembly applications. Common power tools include electric drills, hammer drills, and impact drills. Wireless power tools typically include a motor mechanism, a base mechanism, and a battery pack. The battery pack is detachably connected to the base mechanism, allowing electrical connection between the battery pack and a control board assembly within the base mechanism. The control board assembly controls the operation of the motor mechanism to perform various functions of the power tool. For example, publication number CN110560738B provides a handheld power tool, which includes a housing, a motor, and control components housed within the housing.

[0003] Due to the wide variety and specifications of power tools, each type is equipped with an independent housing, and a base mechanism specifically designed to accommodate the battery pack is required on the housing. These base mechanisms, as part of the housing, not only result in a larger overall housing structure, occupying more storage and usage space, but also, due to the complexity of the housing and base mechanisms, significantly increase the costs of production molds, processing techniques, and spare parts inventory. This presents technical challenges to standardized production and cost control, thus requiring improvement. Utility Model Content

[0004] To overcome the problems existing in the related technologies, this utility model provides a base mechanism for power tools, which solves the technical problems of large structure, wide variety and high production cost caused by the integrated design of the base mechanism and the machine housing.

[0005] According to a first aspect of the present invention, a base mechanism for a power tool is provided. The power tool includes a left housing and a right housing that fit together. The base mechanism includes a bottom shell, a control panel assembly, and a button assembly. The bottom shell includes a clamping flange that protrudes partially from its surface. The left housing and the right housing fit together to clamp the clamping flange and complementarily engage with the outer peripheral wall of the clamping flange. A guide hole is formed at the center of the clamp flange, the control board assembly is located inside the bottom shell, and the control board assembly wires pass through the guide hole.

[0006] In one embodiment, the clamp flange is a thin-walled annular structure, and the outer peripheral wall of the clamp flange is curved and concave to form a curved groove, and the left and right housings close together to clamp and fasten the curved groove.

[0007] In one embodiment, the bottom of the curved groove protrudes to form at least one positioning rib, and the left and right housings respectively complement each other with the corresponding curved groove and positioning rib.

[0008] In one embodiment, the clamp flange is provided with two snap-fit ​​grooves on its side, the snap-fit ​​grooves intersect with the curved grooves, the length direction of the snap-fit ​​grooves is parallel to the closing direction of the left and right housings, and part of the left and right housings are snapped into the snap-fit ​​grooves.

[0009] In one embodiment, the clamp flange has a height difference from the protruding portion on the surface of the bottom shell.

[0010] In one embodiment, in the working axis direction of the power tool, the distance between the center line of the clamp flange and one side of the bottom shell is a first spacing, and the distance between the center line of the clamp flange and the other side of the bottom shell is a second spacing, wherein the first spacing is less than or equal to the second spacing.

[0011] In one embodiment, the bottom shell includes a left shell and a right shell that fit together, forming an electrical cavity between the left shell and the right shell, and the control board assembly is located within the electrical cavity.

[0012] In one embodiment, the left housing includes a left connecting portion and a locking protrusion protruding from the left connecting portion, the right housing includes a right connecting portion and a stepped hole recessed from the right connecting portion, the left connecting portion and the right connecting portion close together to clamp a clamping flange, the locking protrusion is inserted into the stepped hole, and a fastener passes through the stepped hole and is locked to the locking protrusion.

[0013] In one embodiment, the control panel assembly includes control buttons and a light-emitting element. The button assembly is mounted on the bottom shell and located above the control buttons. At least a portion of the button assembly is configured as a light-transmitting structure. The light emitted by the light-emitting element is transmitted outward through the light-transmitting structure to map the working status of the corresponding function of the power tool.

[0014] In one embodiment, the button assembly includes a mounting plate detachably mounted on the bottom shell and a button movably disposed on the mounting plate, wherein the bottom shell snaps onto and fixes the mounting plate; at least a portion of the mounting plate and / or the button is made of a light-transmitting material.

[0015] The technical solution provided by the embodiments of this utility model can include the following beneficial effects: The base shell is the core carrier for connecting with the power tool housing and installing internal components. A local protrusion on the surface of the base shell forms a clamping flange. When the left and right housings are closed, this clamping flange can be precisely held. Furthermore, the outer peripheral walls of the left and right housings and the clamping flange are in a complementary fit, ensuring the stability and versatility of the connection. The same type of base mechanism can be adapted to different power tool housings. The guide hole enables electrical connection with components such as the power tool motor. This guide hole also serves to position and protect the wires, preventing damage to the wires due to pulling or friction. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of the mechanism for fixing the left and right housings together, according to one embodiment.

[0018] Figure 2 This is an exploded structural diagram of the left housing, right housing, and base mechanism according to an embodiment.

[0019] Figure 3 This is a schematic diagram of the base mechanism according to one embodiment.

[0020] Figure 4 This is an exploded structural diagram of the base mechanism according to one embodiment.

[0021] In the figure, the base mechanism is 10; the bottom shell is 11; the left shell is 111; the right shell is 112; the clamp flange is 12; the guide hole is 13; the curved groove is 14; the positioning rib is 15; the snap-fit ​​groove is 16; the electrical cavity is 17; the button assembly is 20; the mounting plate is 21; the button is 22; the control board assembly is 30; the control button is 31; the light-emitting element is 32; the wire is 33; the tool housing is 40; the left housing is 41; the left connecting part is 411; the right housing is 42; the right connecting part is 421; the stepped hole is 422; and the fastener is 43. Detailed Implementation

[0022] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the present invention. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art.

[0023] like Figures 1 to 4 As shown, this utility model provides a base mechanism 10 for a power tool. The power tool includes a left housing 41 and a right housing 42 that fit together. The left housing 41 and the right housing 42 are shell structures. When they are joined together, they form a tool housing 40 and are locked together by fasteners 43. An installation space is formed inside the tool housing 40, which can be used to install the motor mechanism and other functional components. Optionally, the left housing 41 and the right housing 42 can be joined together to form a mounting part and a handle part, and are fixed together by fasteners 43. In the following description, the output direction of the power tool is considered the front end, the back direction is considered the rear end, the direction of the motor is considered the top, and the direction of the battery pack is considered the bottom.

[0024] The base mechanism 10 includes a bottom shell 11, a control panel assembly 30, and a button assembly 20. The bottom shell 11 serves as the core carrier for connecting the tool housing 40 and installing internal components. The bottom shell 11 has a hollow cavity structure. The control panel assembly 30 is located inside the bottom shell 11. The button assembly 20 is installed on the bottom shell 11, and the operating part of the button assembly 20 is located on the surface of the bottom shell 11.

[0025] The bottom shell 11 includes a clamping flange 12 that protrudes partially from its surface. The left housing 41 and the right housing 42 close together to clamp the clamping flange 12, and their outer peripheral walls complement each other. The clamping flange 12 is a partially protruding structure on the surface of the bottom shell 11. The left housing 41 and the right housing 42 can close together to clamp and fix the clamping flange 12, thereby connecting and fixing the bottom shell 11 and the tool housing 40. Further optimized, when the shape and size of the clamping flange 12 are uniform, the snap-fit ​​structure of the left housing 41 and the right housing 42 is adapted to the clamping flange 12, thereby enabling different types of tool housings 40 to be compatible with the same bottom shell 11, greatly reducing the variety of bottom shells 11 and battery packs, and improving connection stability and compatibility. Preferably, the outer edge curve of the cross-section of the clamping flange 12 is an elliptical surface or a non-circular curve.

[0026] A guide hole 13 is formed at the center of the clamp flange 12. The control board assembly 30 is located inside the bottom shell 11, and the wires 33 of the control board assembly 30 pass through the guide hole 13. The control board assembly 30 is fixedly installed inside the bottom shell 11. The wires 33 of the control board assembly 30 can pass through the guide hole 13 to realize the electrical connection between the control board assembly 30 and the motor mechanism and other functional components. The guide hole 13 also serves to position and protect the wires 33, preventing the wires 33 from being damaged by pulling or friction.

[0027] The clamp flange 12 is a thin-walled annular structure, with the guide hole 13 located at the center of the clamp flange 12. A curved groove 14 is formed by a partial recess on the outer peripheral wall of the clamp flange 12, with the recessed portion being a curved, inwardly concave surface. Correspondingly, the left housing 41 and right housing 42 include clamping portions that fit into the curved groove 14. These clamping portions are curved protrusions extending inward, which can be fastened into the corresponding curved groove 14 to achieve clamping and positioning. This not only provides high positioning accuracy but also enables bidirectional locking in both the circumferential and axial directions, facilitating assembly. Furthermore, when the left housing 41 and right housing 42 are closed, they form a clamping and engaging structure with the curved groove 14, increasing the contact area and improving anti-detachment performance.

[0028] Furthermore, at least one positioning rib 15 is formed by a partial protrusion at the bottom of the curved groove 14. The length direction of the positioning rib 15 is set along the extension direction of the curved groove 14, thereby forming an undulating surface structure of the curved groove 14. The left housing 41 and the right housing 42 respectively complement each other with the corresponding curved groove 14 and positioning rib 15, further improving the clamping positioning accuracy of the clamping part and the curved groove 14. More preferably, the protrusion height of the positioning rib 15 is less than the groove height of the curved groove 14, so that the positioning rib 15 can accurately limit the relative displacement between the clamping part and the bottom shell 11, avoiding loosening of the connection due to vibration during use.

[0029] Preferably, the positioning rib 15 is divided into two sections, located on opposite sides of the curved groove 14, to define the left housing 41 and the right housing 42 respectively, thereby further improving the positioning effect of the left housing 41 or the right housing 42.

[0030] like Figures 2 to 4 As shown, in one embodiment, the clamp flange 12 has two locking grooves 16 on its side, which intersect with the curved groove 14. The locking grooves 16 are located at opposite ends of the clamp flange 12, and intersect with the curved groove 14. The length direction of the locking grooves 16 is parallel to the closing direction of the left housing 41 and the right housing 42. After the left housing 41 and the right housing 42 are closed, part of the clamp part is engaged in the locking groove 16, forming end positioning and restricting circumferential rotation, thereby further enhancing the connection stability between the clamp part and the clamp flange 12.

[0031] Furthermore, the protruding portion of the clamp flange 12 on the surface of the bottom shell 11 has a height difference. Correspondingly, the curved groove 14 forms a height curvature change in the height direction of the clamp flange 12, thereby achieving the anti-rotation effect and high positioning accuracy of the clamp part. For example, the rear end height of the clamp flange 12 is greater than the front end height, thus forming a height difference. Correspondingly, the rear end height of the curved groove 14 is greater than the front end height, which can achieve both axial positioning and front-rear limiting.

[0032] In one embodiment, the working axis of the power tool is the same as the output center line of the motor rotation. For example, if the power tool is an electric drill, the working axis is the direction of the drill bit's rotation axis. The clamp flange 12 protrudes from the upper surface of the base shell 11, and is eccentrically positioned on the upper surface of the base shell 11. The distance between the centerline of the clamp flange 12 and the rear side of the base shell 11 is a first spacing, and the distance between the centerline of the clamp flange 12 and the front side of the base shell 11 is a second spacing. The rear and front sides are opposite end faces. The first spacing is less than or equal to the second spacing, thus forming an eccentric structure. In particular, the clamp flange 12 abuts against the rear side of the base shell 11, which can balance the counterweight formed by the battery pack and the counterweight formed by the motor mechanism.

[0033] The left housing 41 and right housing 42 clamp the clamping flange 12, achieving a flush surface and improving aesthetics. Preferably, the bottom housing 11 includes a left housing 111 and a right housing 112 that fit together, forming a hollow electrical cavity 17 after closing. The electrical cavity 17 provides dustproof and waterproof protection for the control board assembly 30. The detachable structure of the left housing 111 and right housing 112 facilitates the assembly of the control board assembly 30, allowing it to be housed within the electrical cavity 17. Furthermore, the independent detachable structure of the left housing 111 and right housing 112 facilitates the installation and maintenance of the internal control board assembly 30.

[0034] In one embodiment, the left housing 41 and the right housing 42 are connected by a clamping flange 12 via a clamping portion. The left connecting portion 411 and the right connecting portion 421 constitute the clamping portion. When the left connecting portion 411 and the right connecting portion 421 are closed, they clamp the clamping flange 12, and the locking protrusion is inserted into the large end of the stepped hole 422 to form a snap-fit ​​positioning. The side of the locking protrusion is correspondingly engaged with the snap-fit ​​groove 16 to ensure a smooth transition between the outer peripheral surfaces of the left housing 41 and the right housing 42.

[0035] After the left connecting part 411 and the right connecting part 421 are closed, they jointly clamp the clamp flange 12. At the same time, the locking protrusion of the left housing 41 is inserted into the stepped hole 422 of the right housing 42, and then the fastener 43 passes through the stepped hole 422 and locks to the locking protrusion, realizing a rigid connection between the left housing 41 and the right housing 42 and the bottom shell 11, ensuring the stability of the overall structure. Preferably, there are two sets of locking protrusions to lock both the front and rear ends of the clamp flange 12, resulting in a high degree of clamp connection strength.

[0036] like Figures 1 to 4 As shown, based on the above embodiments, the base mechanism 10 can also be configured with function control buttons 31 to facilitate the operator in determining the working status of the tool.

[0037] In one embodiment, the control panel assembly 30 integrates control buttons 31 and light-emitting elements 32. The button assembly 20 is located directly above the control buttons 31, and at least a portion of the button assembly 20 adopts a light-transmitting structure. The light emitted by the light-emitting element 32 can be transmitted outward through the light-transmitting structure, allowing the user to intuitively judge the working status of the corresponding function of the power tool by observing the brightness and color changes of the light.

[0038] Among them, the button assembly 20, as the core component of human-computer interaction, can be flexibly installed to meet the operating needs of different power tools. It can be installed on the front face, rear face, or upper surface of the clamp flange 12 of the bottom shell 11. At the same time, the two ends of the button assembly 20 are respectively snapped and limited to the left shell 111 and the right shell 112. The control button 31 is fixed by the closing clamping of the left shell 111 and the right shell 112, without the need for additional fasteners 43, thus simplifying the installation process.

[0039] In one embodiment, the button assembly 20 includes a mounting plate 21 detachably mounted on the bottom shell 11 and a button 22 movably disposed on the mounting plate 21. The bottom shell 11 snaps onto and fixes the mounting plate 21. The bottom shell 11 fixes the mounting plate 21 via a snap-fit ​​mechanism, facilitating the individual replacement and maintenance of the button assembly 20. The mounting plate 21 has a through button hole through which the button 22 extends to the operating surface. A positioning groove is provided at the bottom of the button 22, and the pressing end of the control button 31 on the control board assembly 30 is confined within this positioning groove, ensuring that the operation of the button 22 is accurately transmitted to the control button 31, preventing operational failure.

[0040] The implementation of the light-transmitting structure of the button assembly 20 is flexible and diverse. At least part of the mounting plate 21 can be made of light-transmitting material, or at least part of the button 22 can be made of light-transmitting material. Alternatively, both the light-transmitting mounting plate 21 and the light-transmitting button 22 can be used simultaneously to ensure that the light transmission effect is clearly visible.

[0041] The button assembly 20 is designed to balance ease of operation with status indication, allowing users to quickly operate and intuitively understand the tool's working status. For example, the power tool has a swing protection function to prevent injury from improper operation during use. When the swing angle of the power tool exceeds a preset value, the power tool will shut down. The button assembly 20 controls the start and stop of the swing protection function by pressing it, and the operator can observe the function's activation and deactivation through the light-transmitting structure, making it convenient to use.

[0042] For example, an LED light-emitting element 32 is soldered onto the control panel assembly 30, and the button 22 is made of transparent ABS material. The light emitted by the LED light-emitting element 32 can be transmitted outward through the button 22. When the electric drill is in the swing protection function enabled state, the light-transmitting structure is in a red light state; when the swing protection function is disabled state, no light is transmitted through the light-transmitting structure.

[0043] The base mechanism 10, through its modular design, enables a detachable connection between the base mechanism 10 and the power tool housing, changing the traditional integrated design of the base and housing. The base mechanism 10 complements the left housing 41 and the right housing 42 through the clamp flange 12, making it compatible with different types and specifications of power tools. This eliminates the need to design a separate base mechanism 10 for each type of power tool, significantly reducing the variety of base mechanisms 10.

[0044] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary technical means in the art that are not disclosed in this invention.

Claims

1. A base mechanism for a power tool, the power tool comprising a left housing and a right housing that fit together, characterized in that, The base mechanism includes a bottom shell, a control panel assembly, and a button assembly. The bottom shell includes a clamping flange that protrudes partially from its surface. The left and right housings close together to clamp the clamping flange and complement each other with the outer peripheral wall of the clamping flange. A guide hole is formed at the center of the clamp flange, the control board assembly is located inside the bottom shell, and the control board assembly wires pass through the guide hole.

2. The base mechanism of claim 1, wherein, The clamp flange is a thin-walled annular structure. The outer peripheral wall of the clamp flange is curved and concave to form a curved groove. The left and right housings close together to clamp and fasten the curved groove.

3. The base mechanism of claim 2, wherein, The bottom of the curved groove protrudes to form at least one positioning rib, and the left and right housings respectively complement each other with the corresponding curved groove and positioning rib.

4. The base mechanism of claim 2, wherein, The clamp flange has two snap-fit ​​grooves on its side, which intersect with the curved groove. The length direction of the snap-fit ​​groove is parallel to the closing direction of the left and right housings, and part of the left and right housings are snapped into the snap-fit ​​grooves.

5. The base mechanism of claim 1, wherein, The clamp flange has a height difference from the protruding portion on the surface of the bottom shell.

6. The base mechanism according to claim 5, characterized in that, In the working axis direction of the power tool, the distance between the center line of the clamp flange and one side of the bottom shell is a first spacing, and the distance between the center line of the clamp flange and the other side of the bottom shell is a second spacing, wherein the first spacing is less than or equal to the second spacing.

7. The base mechanism according to claim 1, characterized in that, The bottom shell includes a left shell and a right shell that fit together, forming an electrical cavity between the left shell and the right shell, and the control board assembly is located within the electrical cavity.

8. The base mechanism of claim 1, wherein, The left housing includes a left connecting portion and a locking protrusion protruding from the left connecting portion. The right housing includes a right connecting portion and a stepped hole recessed from the right connecting portion. The left connecting portion and the right connecting portion close together to clamp the clamping flange. The locking protrusion is inserted into the stepped hole. The fastener passes through the stepped hole and is locked to the locking protrusion.

9. A base mechanism according to any one of claims 1-8, characterized in that The control panel assembly includes control buttons and light-emitting elements. The button assembly is mounted on the bottom shell and located above the control buttons. At least a portion of the button assembly is configured as a light-transmitting structure. The light emitted by the light-emitting elements is transmitted outward through the light-transmitting structure to reflect the working status of the corresponding function of the power tool.

10. The base mechanism of claim 9, wherein, The button assembly includes a mounting plate detachably mounted on the bottom shell and a button movably mounted on the mounting plate, with the bottom shell snapping onto and fixing the mounting plate; at least a portion of the mounting plate and / or the button is made of a light-transmitting material.

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