Handheld electric tool

Abstract

The utility model relates to a handheld electric tool comprising a buffer module. In the prior art, a rubber gasket often falls off from an existing handheld electric tool, and components in the handheld electric tool cannot be effectively protected. Therefore, the utility model discloses a handheld electric tool which comprises a first shell, a second shell and a buffer module arranged between the first shell and the second shell. The buffer module comprises a supporting plate and a telescopic cover assembly; the cover assembly comprises a rigid part connected to the first shell and a flexible part with a first end part and a second end part; the first end part of the flexible part is fixedly connected with the rigid part; the rigid part is fastened to the second shell so that the second end of the flexible part can be clamped between the bearing plate and the second shell in the axial direction of the handheld electric tool. According to the handheld electric tool, components in the handheld electric tool can be effectively protected, and meanwhile the dustproof purpose can be achieved.

Description

Technical Field

[0001] The utility model relates to a hand-held power tool, and particularly to a hand-held power tool including a buffer module. Background Art

[0002] In the prior art, for those of ordinary skill in the art, hand-held power tools having a drive unit (such as a hammer drill, an electric drill or a breaker, etc.) are known.

[0003] A hand-held power tool generally has a motor, a drive mechanism, a front housing, a rear housing, and a handle. In some cases, the hand-held power tool further includes a shock-absorbing mechanism (such as a spring). Among them, the drive mechanism is driven by the motor, and the front housing houses the motor and the drive mechanism. The handle is connected to the rear housing and can be removed relative to the rear housing. The shock-absorbing mechanism is generally clamped between the front housing and the rear housing.

[0004] In some prior arts, the first housing and the second housing of the hand-held power tool are directly connected. In some other prior arts, a rubber washer serving as a buffer module is provided between the first housing and the second housing of the hand-held power tool to protect the components inside the hand-held power tool and at the same time prevent dust from falling into the interior of the hand-held power tool.

[0005] Although the rubber washer can be relatively easily installed between the first housing and the second housing of the hand-held power tool, due to the lack of effective fixing measures, the rubber washer provided between the first housing and the second housing may peel off or fall off during use, thus unable to effectively protect the components inside the hand-held power tool and further unable to perform the dust-proof function.

[0006] In order to prevent the buffer module such as the rubber washer from peeling off or falling off the hand-held power tool (or specifically, from between the first housing and the second housing of the hand-held power tool), it is necessary to optimize and improve the relevant structure of the hand-held power tool. Summary of the Utility Model

[0007] The technical problem of the utility model is how to prevent the buffer module such as the rubber washer from peeling off or falling off the hand-held power tool (or more precisely, from between the first housing and the second housing of the hand-held power tool).

[0008] According to one aspect of the present utility model, a handheld power tool is disclosed, which includes: a first housing, a second housing, and a buffer module disposed therebetween, wherein: the buffer module includes a support plate and a telescopic cover assembly; the cover assembly includes a rigid portion connected to the first housing, and a flexible portion having a first end and a second end; the first end of the flexible portion is fixedly connected to the rigid portion; the rigid portion is fastened to the second housing such that the second end of the flexible portion is axially clamped between the support plate and the second housing along the handheld power tool.

[0009] Optionally, the second end of the flexible portion at least partially covers the support plate.

[0010] Optionally, the second end of the flexible portion includes a radial portion extending radially inward along the handheld power tool, and the support plate has a radial portion extending radially outward along the handheld power tool, wherein the radial portion of the flexible portion is axially clamped between the radial portion of the support plate and the opposite end face of the second housing along the handheld power tool.

[0011] Optionally, along the axial direction of the handheld power tool, the rigid portion is fastened to the inner side of the first end of the flexible portion.

[0012] Optionally, the rigid portion is fastened to the first housing by snap fit, a sliding groove and slider structure or a bolt.

[0013] Optionally, the support plate and the second housing are respectively provided with a protruding portion and a notch portion; the protruding portion is inserted into the notch portion such that the support plate is limited in the circumferential and radial directions of the handheld power tool relative to the second housing.

[0014] Optionally, the flexible portion is made of rubber and the rigid portion is made of hard plastic.

[0015] Optionally, the rigid portion and the flexible portion are integrally formed or insert molded into the cover assembly.

[0016] Optionally, the buffer module further includes an elastic retaining member, which is disposed between the opposite end faces of the rigid portion and the support plate under extrusion, such that the first housing and the second housing are axially spaced apart by a certain distance along the handheld power tool.

[0017] Optionally, the cover assembly is a bellows.

[0018] As a beneficial technical effect of the present utility model, the rigid part of the cover assembly of the buffer module is fastened to the second housing of the hand-held power tool, so that the second end of the flexible part of the cover assembly is clamped between the support plate and the second housing along the axial direction of the hand-held power tool. With this structural arrangement, it is impossible to remove the buffer module (or specifically, the flexible part of the cover assembly of the buffer module) from between the first housing and the second housing without first disassembling the second housing. Correspondingly, the buffer module (or more precisely, the flexible part of the buffer module) between the first housing and the second housing is not likely to peel off or fall off during use. Thus, according to the technical solution of the present utility model, the components inside the hand-held power tool can be effectively protected, and at the same time, the purpose of dust prevention can also be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The remarkable features and advantages of the present utility model will be derived from the following non-restrictive description with reference to the accompanying drawings, wherein:

[0020] Figure 1 shows an overall front view of a hand-held power tool according to the present application;

[0021] Figure 2 shows a perspective view of the first housing, the second housing and the buffer module of the hand-held power tool according to the present application when assembled together;

[0022] Figure 3 shows an exploded perspective view of the buffer module.

[0023] Figure 4 shows an assembled perspective view of the buffer module.

[0024] Figure 5 shows a state where the cover assembly of the buffer module is separated from the support plate.

[0025] Figure 6 shows the cover assembly and the support plate of the buffer module assembled together.

[0026] Figure 7 shows a state where the buffer module is separated from the second housing.

[0027] Figure 8 shows the buffer module and the second housing assembled together.

[0028] Figure 9 shows a schematic view of the cover assembly of the buffer module being assembled onto the second housing.

[0029] Figure 10 shows a state where the buffer module is fastened to the second housing with screws.

[0030] Figure 11Shows the installation position of the screw on the buffer module.

[0031] Figure 12 Shows that the elastic member will be arranged between the rigid part of the cover assembly and the front end of the rear housing.

[0032] Figure 13 Shows a perspective view of the buffer module and the second housing assembled together.

[0033] Figure 14 Shows an assembly schematic diagram of the first housing, the buffer module and the second housing of the power tool according to the present application.

[0034] Figure 15 Shows a mating schematic diagram of the cover assembly of the buffer module and the first housing.

[0035] Figure 16 Shows the snap position of the cover assembly of the buffer module and the first housing. Detailed implementation

[0036] In the context of the present application, the axial direction corresponds to or is parallel to the direction of the output shaft of the motor of the hand-held power tool, as indicated by X in Figure 1 . The side in the axial direction close to the working end or the operating end of the hand-held power tool is defined as the front or the front side, and the side close to the handle of the hand-held power tool is positioned as the rear or the rear side. The circumferential direction means the direction corresponding to or parallel to the circumferential direction of the stator of the motor of the hand-held power tool when observed along the axial direction of the hand-held power tool, as indicated by Y in Figure 1 . The radial direction means the direction corresponding to or parallel to the diameter direction of the stator of the motor of the hand-held power tool when observed along the axial direction of the hand-held power tool. The definitions of the above directions are only exemplary. As those of ordinary skill in the art will understand, various different orientations can be used to define each direction without departing from the scope of the present application.

[0037] Figure 1 Shows an overall front view of the hand-held power tool according to the present application. As an example, the hand-held power tool 100 of the present application can be a hammer drill, an electric drill or a demolition hammer. Although an exemplary structure is shown in the description and drawings of the present application, those of ordinary skill in the art of the present application will understand that the technical solutions and concepts of the present application are also applicable to hand-held power tools with other structures.

[0038] Specific descriptions will be made below with reference to the accompanying drawings. Generally speaking, the hand-held power tool 100 according to the present application includes a first housing 10, a second housing 20, and a buffer module 30 disposed therebetween. The buffer module 30 includes a support plate 32 and a telescopic cover assembly 31. The cover assembly 31 includes a rigid portion 31a connected to the first housing 10, and a flexible portion 31b having a first end and a second end. The first end of the flexible portion 31b is fixedly connected to the rigid portion 31a, and the rigid portion 31a is fastened to the second housing 20 such that the second end of the flexible portion 31b is clamped between the support plate 32 and the second housing 20 along the axial direction of the hand-held power tool 100.

[0039] As Figure 1 shown, the hand-held power tool 100 includes: a first housing 10, a second housing 20, and a handle 40 connected to the second housing 20. Optionally, the first housing 10 is stationary, and the second housing 20 is relatively movable with respect to the first housing 10 within a certain displacement range. A motor and an impact structure (not shown) are installed in the first housing 10.

[0040] The hand-held power tool 100 may additionally include control elements or configurations for implementing various operations of the hand-held power tool 100. These control elements or configurations can be disposed at any appropriate position of the hand-held power tool 1 without departing from the protection scope of the present application.

[0041] Figure 2 The perspective view shows the first housing 10, the second housing 20 and the buffer module 30 of the hand-held power tool 100 according to the present application when assembled together. The buffer module 30 is disposed between the first housing 10 and the second housing 20, and is optionally configured in a cylindrical shape to achieve a shock absorption or isolation effect. To protect the components inside the hand-held power tool 100, the buffer module 30 optionally has a dust-proof function. In some embodiments, the buffer module 30 can also play a waterproof role.

[0042] Figure 3 The exploded perspective view shows the buffer module 30, Figure 4 The assembled perspective view shows the buffer module 30. As Figure 3 shown, the buffer module 30 includes a support plate 32 and a telescopic cover assembly 31. The cover assembly 31 includes a rigid portion 31a connected to the first housing 10, and a flexible portion 31b having a first end and a second end. The rigid portion 31a is made of hard plastic. The flexible portion 31b is made of rubber, such as TPE for example.

[0043] As Figure 3 shown, the first end of the flexible portion 31b is fixedly connected to the rigid portion 31a. AsFigure 9 As shown, the rigid portion 31a is fastened to the second housing 20 such that the second end of the flexible portion 31b is axially clamped between the support plate 32 and the second housing 20 of the hand-held power tool 100.

[0044] Optionally, the telescopic cover assembly 31 is a bellows. Through integral molding or insert molding techniques, a telescopic cover assembly 31 with a rigid portion 31a and a flexible portion 31b can be produced. Integral molding or insert molding techniques can be, for example, two-color injection molding techniques or two-material injection molding techniques. However, the present application is not limited thereto, but can also be joined together by other techniques. For example, an interference fit is performed between the outer periphery of the rigid portion 31a and the inner periphery of the flexible portion 31b such that the rigid portion 31a and the flexible portion 31b are connected to form the telescopic cover assembly 31.

[0045] As Figure 3 shown, the buffer module 30 further includes an elastic retainer 33 which is disposed between the opposite end faces of the rigid portion 31a and the support plate 32 under extrusion, such that the first housing 10 and the second housing 20 are axially spaced apart by a certain distance along the hand-held power tool 100.

[0046] An alternative embodiment of the elastic retainer 33 is a spring. In the embodiments of the present application, the number of the elastic members can be 2, 3, 4 or more. In the assembled state as Figure 4 shown, the elastic retainer 33 is pushed and disposed between the opposite end faces of the telescopic cover assembly 31 and the support plate 32 so that the relative relationship between the cover assembly 31 and the support plate 32 is fixed, and further the first housing 10 and the second housing 20 are axially spaced apart by a certain distance along the hand-held power tool 100. During the operation of the hand-held power tool 100, the elastic retainer 33 can play a role of pushing, buffering or shock absorption. However, in some embodiments, the elastic retainer 33 can also be omitted.

[0047] As Figure 3 、 4 and 9 shown, the flexible portion 31b has a certain deformation or extension performance in the axial direction of the hand-held power tool 100, or the axial dimension of the flexible portion 31b is greater than the axial dimension of the rigid portion 31a, such that the second end of the flexible portion 31b at least partially covers the support plate 32.

[0048] Further as Figure 9As shown, the second end of the flexible part 31b has a first radial part 31b2 extending radially inward along the radial direction of the hand-held power tool 100, and a first peripheral part 31b1 extending axially. The first radial part 31b2 and the first peripheral part 31b1 at least partially cover the support plate 32.

[0049] The first radial part 31b2 and the first peripheral part 31b1 of the support plate 32 are integrally formed, and the local cross-section is substantially L-shaped. The periphery and a part of the rear end face of the support plate 32 are covered by the first radial part 31b2 and the first peripheral part 31b1 of the flexible part 31b, so as to play a role in protecting the internal components of the hand-held power tool 1 and preventing dust.

[0050] The support plate 32 is formed, for example, by injection molding of hard plastic. As Figure 3 、 4 、5、9 shown, the center of the support plate 32 is open, and has a third radial part 32b extending radially outward and a third peripheral part 32a extending axially backward. The third radial part 32b and the third peripheral part 32a are integrally formed, and the local cross-section is substantially L-shaped.

[0051] The rigid part 31a is fastened to the second housing 20, so that the first radial part 31b2 of the flexible part 31b is clamped axially between the third radial part 32b of the support plate 32 and the opposite end face of the second housing 20. Accordingly, the cover assembly 31 of the flexible part 31b is not likely to peel off or fall off between the first housing 10 and the second housing 20 during use. Therefore, the utility model can effectively protect the internal components of the hand-held power tool 100 and also achieve the purpose of dust prevention.

[0052] Figure 5 It shows that the cover assembly 31 of the buffer module 30 and the support plate 32 are in a separated state. Figure 6 It shows the cover assembly 31 of the buffer module 30 and the support plate 32 assembled together. Figure 7 It shows the separated buffer module 30 and the second housing 20.

[0053] As Figure 5 and 7 shown, the support plate 32 has a protruding part 32c extending towards the second housing 20, and a notch part 20b extending backward is provided on the inner side surface of the second housing 20. The protruding part 32c of the support plate 32 and the notch part 20b of the second housing 20 are substantially in shape fit. The protruding part 32c is inserted into the notch part 20b, so that the support plate 32 is limited in the circumferential and radial directions of the hand-held power tool 100 relative to the second housing 20.

[0054] In some embodiments, the support plate 32 may not be provided with the protrusion 32c extending toward the second housing 20, and the inner side surface of the second housing 20 may not be provided with the notch 20b extending backward. In this case, the support plate 32 and the second housing 20 may be limited by, for example, screws or bolts.

[0055] like Figures 7 - 9 As shown, the second housing 20 has a front end portion 20a for engaging with the support plate 32 and the flexible portion 31b of the telescopic cover assembly 31. The second housing 20 includes a second peripheral portion 20a1 extending forward in the axial direction and a second radial portion 20a2 extending radially inward. The second peripheral portion 20a1 and the second radial portion 20a2 are integrally formed, and the partial cross section is roughly inverted L-shaped.

[0056] When the cover assembly 31 and the support plate 32 are assembled, Figure 6 , 8 As shown in FIG. 9 , the end of the flexible portion 31b of the cover assembly 31 is expanded to enclose the support plate 32 (or more precisely, the third radial portion 32b of the support plate 32) in the second end of the flexible portion 31b. Figures 9 - 11 As shown, the fastening device 80 fastens the rigid portion 31a to the second housing 20 in the axial direction, so that the first radial portion 31b2 is clamped between the support plate 32 and the corresponding end surface of the second radial portion 20a2. Accordingly, the buffer module 30 (or the flexible portion 31b of the buffer module 30) cannot be easily removed from between the first housing 10 and the second housing 20 without disassembling the second housing 20.

[0057] Furthermore, if Figure 9 As shown in FIG. 1 , the first peripheral portion 31b1 of the flexible portion 31b is radially disposed between the third radial portion 32b of the support plate 32 and the second peripheral portion 20a1 of the front end portion 20a of the second shell 20. Specifically, the first peripheral portion 31b1 of the flexible portion 31b contacts the outer periphery of the third radial portion 32b of the support plate 32 in the radial direction, so that the flexible portion 31b additionally covers the support plate 32. However, the first peripheral portion 31b1 of the flexible portion 31b may contact the inner periphery of the second peripheral portion 20a1 of the front end portion 20a of the second shell 20 in the radial direction, or may not contact the inner periphery of the second peripheral portion 20a1 of the front end portion 20a of the second shell 20. In any case, according to the utility model, the first radial portion 31b2 of the rear end portion of the cover assembly 31 is clamped in the axial direction between the rear end surface of the third radial portion 32b of the support plate 32 and the front end surface of the second radial portion 20a2 of the front end portion 20a of the second shell 20.

[0058] Figure 11Shows the installation position of the fastening device 80 on the buffer module 30. As an alternative embodiment, the fastening device 80 is a screw or a bolt. The fastening device 80 fastens the buffer module 30 (or the support plate 32 of the buffer module 30) to the front end portion 20a of the second housing 20. The number of the fastening devices 80 can be two or more. Optionally, the threaded holes provided on the support plate 32 and the front end portion 20a of the second housing 20 are evenly distributed circumferentially, so that the support plate 32 of the buffer module 30 is fastened to the front end portion 20a of the second housing 20 with uniform force applied by the fastening devices 80.

[0059] As Figure 12 shown, between the rigid portion 31a of the telescopic cover assembly 31 and the opposite end faces of the support plate 32, two or more compressed elastic holding members 33 can be provided, so that the first housing 10 and the second housing 20 are spaced apart by a certain distance along the axial direction of the hand-held power tool 100. The buffer module 30 and the second housing 20 form an integral structure. Figures 14 - 16 Shows how to fasten the integral structure formed by the buffer module 30 and the second housing 20 to the first housing 10.

[0060] Figure 14 Shows an assembly schematic diagram of the first housing 10, the buffer module 30, and the second housing 20 of the hand-held power tool 100. Figure 15 Shows a mating schematic diagram of the telescopic cover assembly 31 of the buffer module 30 and the first housing 10. Figure 16 Shows the snap position of the telescopic cover assembly 31 of the buffer module 30 and the first housing 10.

[0061] A snap structure 11 is provided on the rear end portion 10a of the first housing 10, and a corresponding snap structure 11 is also provided on the rigid portion 31a of the telescopic cover assembly 31 of the buffer module 30. By means of the snap fit between the snap structures 11, the integral structure of the buffer module 30 and the second housing 20 is connected to the first housing 10.

[0062] Optionally, a chute or a slider is respectively provided on the rear end portion 10a of the first housing 10 and on the rigid portion 31a of the cover assembly 31 of the buffer module 30. During assembly, first, the slider is translated circumferentially by a certain distance in the chute, and then rotated circumferentially so that the chute and the slider are locked, thereby connecting the integral structure of the buffer module 30 and the second housing 20 to the first housing 10.

[0063] Optionally, by means of a threaded screw structure, the integral structure of the buffer module 30 and the second housing 20 is connected to the first housing 10. In this case, at the rear end portion 10a of the first housing 10 and at appropriate positions of the rigid portion 31a of the cover assembly 31 of the buffer module 30, threaded holes or threaded portions for threaded connection are respectively provided for threaded connection, so as to connect the integral structure of the buffer module 30 and the second housing 20 to the first housing 10.

[0064] The above-described connection method for connecting the integral structure of the buffer module 30 and the second housing 20 to the first housing 10 is merely exemplary. Those of ordinary skill in the art can envision using any connection method, such as a form-fit connection method, to achieve the connection of the first housing 10 and the integral structure of the buffer module 30 and the second housing 20, without departing from the scope of the present application.

[0065] During assembly, first, the buffer module 30 is connected to the second housing 20 to form an integral structure, and then the integral structure is connected to the first housing 10. Those of ordinary skill in the art can envision that the buffer module 30 can be first connected to the first housing 10 to form an integral structure, and then the integral structure can be connected to the second housing 20.

[0066] Although the embodiments of the present application have been specifically described above in conjunction with the accompanying drawings, those of ordinary skill in the art can make various modifications or substitutions to the above embodiments according to the teachings of the present application without departing from the protection scope of the present application.

Claims

1. A handheld electric tool (100), comprising: A first housing (10), a second housing (20), and a buffer module (30) disposed therebetween, characterized in that: The buffer module (30) comprises a support plate (32) and a retractable cover assembly (31); the cover assembly (31) comprises a rigid portion (31a) connected to the first shell (10), and a flexible portion (31b) having a first end and a second end; The first end of the flexible part (31b) is fixedly connected to the rigid part (31a); The rigid portion (31a) is fastened to the second housing (20) so that the second end of the flexible portion (31b) is clamped between the support plate (32) and the second housing (20) along the axial direction of the handheld power tool (100).

2. The handheld power tool (100) according to claim 1, characterized in that: The second end of the flexible portion (31b) at least partially covers the support plate (32).

3. The handheld power tool (100) according to claim 1 or 2, characterized in that: The second end of the flexible portion (31b) includes a radial portion (31b2) extending radially inwardly along the handheld power tool (100), and the support plate (32) has a radial portion (32b) extending radially outwardly along the handheld power tool (100), wherein the radial portion (31b2) of the flexible portion (31b) is clamped between the radial portion (32b) of the support plate (32) and the opposite end faces of the second shell (20) along the axial direction of the handheld power tool (100).

4. The handheld power tool (100) according to claim 1 or 2, characterized in that: Along the axial direction of the handheld electric tool (100), the rigid portion (31a) is fastened to the inner side of the first end portion of the flexible portion (31b).

5. The handheld power tool (100) according to claim 1 or 2, characterized in that: The rigid part (31a) is fastened to the first housing (10) by snap-fitting, a slide groove and slider structure or bolts.

6. The handheld power tool (100) according to claim 1 or 2, characterized in that: The support plate (32) and the second shell (20) are respectively provided with a protruding portion (32c) and a notch portion (20b), and the protruding portion (32c) is inserted into the notch portion (20b), so that the support plate (32) is limited relative to the second shell (20) in the circumferential and radial directions of the handheld power tool (100).

7. The handheld power tool (100) according to claim 1 or 2, characterized in that: The flexible part (31b) is made of rubber, and the rigid part (31a) is made of hard plastic.

8. The handheld power tool (100) according to claim 1 or 2, characterized in that: The rigid part (31a) and the flexible part (31b) are integrally molded or insert-molded to form the cover assembly (31).

9. The handheld power tool (100) according to claim 1 or 2, characterized in that: The buffer module (30) further comprises an elastic retaining member (33) which is arranged in a compressed manner between the rigid portion (31a) and the opposite end faces of the support plate (32) so that the first shell (10) and the second shell (20) are spaced apart by a certain distance along the axial direction of the handheld power tool (100).

10. The handheld power tool (100) according to claim 1 or 2, characterized in that: The cover assembly (31) is a bellows.

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