Shield assembly and angle grinder

Abstract

The utility model relates to a shield assembly and an angle grinder, the shield assembly is used for the angle grinder, the shield assembly is provided with a first shield and a second shield connected to the first shield, and the second shield pivots around the center line of the first shield; the protective cover assembly is characterized in that the protective cover assembly is provided with a first positioning mechanism connected to the first protective cover, the first positioning mechanism comprises a pressing ring, a plurality of elastic pieces arranged on the circumferential end face of the pressing ring at intervals and positioning pieces installed on the first protective cover and biased by the elastic pieces, the pressing ring is installed on the first protective cover, and the first protective cover is provided with a through first groove; the positioning member is accommodated in the first groove and abuts against the second shield.

Description

Technical Field

[0001] The utility model relates to the technical field of power tools, in particular to a guard assembly and a angle grinder. Background Art

[0002] An angle grinder is a power tool that uses a motor as a power source to drive a transmission assembly to drive a working wheel for grinding or cutting operations. Moreover, a guard assembly needs to be installed during the operation of the angle grinder. The guard assembly is wrapped around the outer periphery of the working wheel to protect the safety of the operator.

[0003] Furthermore, due to different working environments, the angle grinder needs to be equipped with guard assemblies with different functions. The existing angle grinders usually install guard assemblies for grinding. When the angle grinder is used for cutting work, a cutting guard assembly needs to be replaced. However, when the user switches the working scenario of the angle grinder, replacing the guard assembly not only consumes a long time, but also it is difficult to obtain a better experience due to the frequent replacement of the guard assembly.

[0004] In view of this, it is necessary to provide an improved guard assembly and an angle grinder to overcome the defects existing in the prior art. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a guard assembly and an angle grinder. When the angle grinder is equipped with this guard assembly, the quick replacement of the grinding function and the cutting function can be realized, and at the same time, the user experience of operating the angle grinder can be improved.

[0006] The utility model solves the problems of the prior art by adopting the following technical solutions: A shield assembly, the shield assembly having a first shield and a second shield connected to the first shield, the second shield pivoting about the center line of the first shield, the shield assembly having a first positioning mechanism connected to the first shield, the first positioning mechanism including a pressing ring, a plurality of elastic members spaced on the circumferential end face of the pressing ring, and a positioning member installed on the first shield and biased by the elastic members, the pressing ring being installed on the first shield, the first shield having a through first groove, the first shield having a clamping ring, a first wall portion radially extending along the center line from the outer circumference of the clamping ring, and a second wall portion axially extending along the center line from the outer circumference of the first wall portion, the second wall portion having a first straight section and a first inclined section extending at an angle from the first straight section, the first grooves being spaced apart on the first inclined section, the positioning member being received in the first groove and abutting against the second shield, the second shield having a third wall portion arranged parallel to the first wall portion and radially extending along the center line, and a fourth wall portion axially extending along the center line from the outer circumference of the third wall portion, the fourth wall portion having a second straight section and a second inclined section extending at an angle from the second straight section, the second inclined section having second grooves spaced apart, the positioning member being at least partially received in the second groove.

[0007] A further improvement is that: the pressing ring has third grooves spaced on the circumferential end face, and the elastic members are installed in the third grooves.

[0008] A further improvement is that: the shield assembly has a second positioning mechanism pivotally connecting the second shield to the first shield, the second positioning mechanism including bumps spaced on the axial end face of the first wall portion and a pair of ribs protruding from the axial end face of the third wall portion, the bumps sliding between the pair of ribs.

[0009] A further improvement is that: the second shield has a third positioning mechanism installed on the fourth wall portion, the third positioning mechanism having a pressing plate for a user to press, a clamping plate connected to the pressing plate, and a tooth portion formed at the end of the clamping plate, the tooth portion realizing the fixing and releasing of the second shield relative to the first shield.

[0010] A further improvement is that: the first inclined section fits against the radially outer side of the second inclined section, and the pressing ring fits against the radially outer side of the first inclined section.

[0011] A further improvement is that: the elastic member is a spring, and the positioning member is a steel ball.

[0012] A further improvement solution is as follows: The second shield has a fifth wall portion connected to the fourth wall portion, and a reinforcing rib is provided on the axial end face of the fifth wall portion, and the reinforcing rib is hexagonal.

[0013] The present utility model can also adopt the following technical solution to solve the problems of the prior art: An angle grinder includes a housing, and the angle grinder includes the shield assembly described in any one of the above.

[0014] Compared with the prior art, the present utility model has the following beneficial effects: By means of the first positioning mechanism, the second shield can be pivoted relative to the first shield, enabling the shield assembly to be quickly replaced between the grinding function and the cutting function, thereby improving the user experience when operating the angle grinder; The first positioning mechanism consists of steel balls received in the first groove and the second groove and a spring installed in the third groove, with good positioning effect and easy disassembly and assembly; The second positioning mechanism enables the second shield to pivot relative to the first shield through the mutual sliding between the convex points and the convex ribs, and the third positioning mechanism can lock and release the second shield relative to the first shield through the tooth portion, with a clever structure and easy processing; A hexagonal reinforcing rib is provided on the axial end face of the fifth wall portion, and in the case where the second shield and the first shield are stuck, the user can use a wrench to act on the reinforcing rib to disassemble the second shield, which is beneficial to user operation. [Description of the Drawings]

[0015] The following further elaborates on the specific embodiments of the present utility model with reference to the drawings:

[0016] Figure 1 is a three-dimensional schematic diagram of the angle grinder in the present utility model;

[0017] Figure 2 is Figure 1 a structural schematic diagram of the shield assembly in the shown angle grinder;

[0018] Figure 3 is Figure 2 an exploded schematic diagram of the shown shield assembly;

[0019] Figure 4 is Figure 2 a cross-sectional view of the shown shield assembly;

[0020] Figure 5 is Figure 4 an enlarged view of part C in the shown shield assembly;

[0021] Figure 6 is Figure 2 a pivoting schematic diagram of the second shield relative to the first shield in the shown shield assembly;

[0022] Figure 7 is Figure 2 a schematic diagram of another view angle of the shown shield assembly

[0023] Meanings of the reference signs in the figures:

[0024] Shield assembly 100, first shield 1

[0025] Clamping ring 11, connecting ear 111

[0026] First wall portion 12, bump 121

[0027] Second wall portion 13, first straight section 131

[0028] First inclined section 132, first groove 132a

[0029] First through hole 132b, second shield 2

[0030] Third wall portion 21, rib 211

[0031] Chute 212, fourth wall portion 22

[0032] Second straight section 221, second inclined section 222

[0033] Second groove 222a, fifth wall portion 23

[0034] Reinforcing rib 24, first positioning mechanism 3

[0035] Pressing ring 31, third groove 311

[0036] Second through hole 312, elastic member 32

[0037] Positioning member 33, fastener 34

[0038] Second positioning mechanism 4, third positioning mechanism 5

[0039] Pressing plate 51, clamping plate 52

[0040] Tooth portion 53, angle grinder 600

[0041] Machine housing 6, motor cylinder portion 61

[0042] Grip portion 62, head housing 63

[0043] Working wheel 7, first direction A

[0044] Second direction B, first end wire D

[0045] Second end wire E, opening and closing angle F

[0046] Center line X [Detailed implementation manners]

[0047] The terms used in the present utility model are for the purpose of describing specific embodiments only and are not intended to limit the present utility model. For example, the terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0048] Please refer to Figure 1 , an embodiment of the present utility model relates to a angle grinder 600, which includes a housing 6, a drive assembly (not shown) received in the housing 6, and a guard assembly 100 connected to the front end of the housing 6. Specifically, the housing 6 includes a motor barrel portion 61 for accommodating a motor assembly (not shown), and a grip portion 62 and a head shell 63 detachably connected to both sides of the motor barrel portion 61. The guard assembly 100 is installed at the end of the head shell 63. Further, the drive assembly is driven under the action of a power source to drive the working wheel 7 installed in the guard assembly 100 to rotate at a high speed, and the user can hold the grip portion 62 to perform grinding or cutting operations.

[0049] Please refer to Figure 1 and Figure 2 , the guard assembly 100 includes a first guard 1, a second guard 2, and a first positioning mechanism 3 that enables the second guard 2 to pivot relative to the first guard 1. The first guard 1 is a grinding guard installed when the angle grinder performs grinding operations. It is connected to the head shell 63 through a circular clamping ring 11, and is fastened through the connecting ears 111 at the end of the clamping ring 11.

[0050] The center of the clamping ring 11 is penetrated by a center line X. The first shield 1 has a first wall portion 12 extending radially outward along the center line X from the outer periphery of the clamping ring 11 and a second wall portion 13 extending axially along the center line X in a direction away from the clamping ring 11 from the end of the first wall portion 12: A plurality of bumps 121 distributed in a semicircular shape along the radial edge protrude from the lower surface of the first wall portion 12, and the axial lengths of these bumps 121 are equal; The second wall portion 13 includes a first straight section 131 perpendicular to the first wall portion 12 and a first inclined section 132 extending obliquely from the lower end of the first straight section 131 toward the radial inner side of the first straight section 131. The circumferential end surface of the first inclined section 132 is penetrated by first grooves 132a arranged at intervals, and moreover, the opening diameter of the first groove 132a on the radial inner side is smaller than the opening diameter on the radial outer side; A first through hole 132b also penetrates through the first inclined section 132, and the inner diameter of the first through hole 132b is smaller than the minimum inner diameter of the first groove 132a. The first through hole 132b is not distributed alternately with the first groove 132a, but rather, one first through hole 132b is distributed every several first grooves 132a, and moreover, one first through hole 132b needs to be arranged at each circumferential end of the first inclined section 132.

[0051] Please continue to refer to Figure 1 and Figure 2 , the second shield 2 is a semi-cylinder closed on three sides and can be accommodated inside the first shield 1. The second shield 2 includes a third wall portion 21 perpendicular to the center line X, a fourth wall portion 22 extending axially along the center line X from the lower end surface of the third wall portion 21, and a fifth wall portion 23 connected to the inner side of the fourth wall portion 22 and parallel to the third wall portion 21. A pair of semi-circular convex ribs 211 protrude from the upper end surface of the third wall portion 21, and a chute 212 is formed between the pair of convex ribs 211 for cooperating with the bumps 121; The fourth wall portion 22 is composed of a second straight section 221 perpendicular to the third wall portion 21 and a second inclined section 222 inclined from the end of the second straight section 221 toward the radial inner side. The outer peripheral surface of the second inclined section 222 is provided with second grooves 222a that do not penetrate the second inclined section 222 at intervals. The number of the second grooves 222a is equal to the number of the first grooves 132a, and moreover, the angle formed by two adjacent first grooves 132a in the circumference is equal to the angle formed by two adjacent second grooves 222a in the circumference.

[0052] Furthermore, for the description of the assembly process of the first shield 1 and the second shield 2, please refer to Figures 2 to 5: A first positioning mechanism 3 is fixedly installed on the outer periphery of the first shield 1. The first positioning mechanism 3 includes a pressing ring 31 in the shape of a circular ring strip. The height of the pressing ring 31 in the axial direction is equal to the height of the first inclined section 132 in the axial direction. Third grooves 311 are arranged at intervals on the circumferential end face of the pressing ring 31. The third grooves 311 do not penetrate the pressing ring, and their inner diameter is equal to the inner diameter of the radially outer opening of the first groove 132a. Furthermore, the number of the third grooves 311 is equal to that of the first grooves 132a and the second grooves 222a. That is to say, the third grooves 311, the second grooves 222a, and the first grooves 132a can coincide with each other in the axial direction. There are also second through holes 312 corresponding to the first through holes 132b on the pressing ring 31. The number of the second through holes 312 is the same as that of the first through holes 132b, and the inner diameter of the second through holes 312 is equal to the inner diameter of the first through holes 132b. And, one second through hole 312 needs to be arranged at each circumferential end of the pressing ring 31.

[0053] When installing the pressing ring 31 onto the first shield 1, the elastic member 32 can be first fixed in the third groove 311, and the positioning member 33 is placed in the first groove 132a. Subsequently, the pressing ring 31 is fitted to the first inclined section 132, and the first groove 132a and the second groove 222a, the first through hole 132b and the second through hole 312 are aligned with each other. Finally, the fastener 34 can be passed through the first through hole 132b and the second through hole 312 to fasten the pressing ring 31 to the first inclined section 132. Further, when the pressing ring 31 and the first inclined section 132 are completely fixed, the elastic member 32 in the third groove 311 will bias the positioning member 33, thereby preventing the positioning member 33 from shaking. It should be noted that the positioning member 33 needs to be exposed from the radially inner opening of the first groove 132a. In this embodiment, the elastic member 32 is a spring, the positioning member 33 is a steel ball, and the fastener 34 is a fastening screw.

[0054] When installing the second shield 2 onto the first shield 1, it needs to be connected through the second positioning mechanism 4. And the second positioning mechanism 4 is composed of the convex points 121 on the first shield 1 and the sliding grooves 212 on the second shield 2. First of all, it should be noted that the maximum outer diameter of the second shield 2 needs to be smaller than the inner diameter of the first shield 1. This is a prerequisite for the second shield 2 to be accommodated in the first shield 1. Furthermore, since the convex points 121 can slide in the sliding grooves 212, a connecting mechanism is formed between the first shield 1 and the second shield 2.

[0055] Next, the pivoting of the shield assembly 100 will be described. Please refer to Figure 1 、 Figure 3 and Figure 6If only the first positioning mechanism 3 and the second positioning mechanism 4 are set between the first shield 1 and the second shield 2, the second shield 2 will inevitably shake with the first shield 1 after installation. In this regard, the shield assembly 100 is also provided with a third positioning mechanism 5: the third positioning mechanism 5 is formed at the end of the second straight section 221, including a pressing plate 51, a clamping plate 52 vertically connected to the pressing plate 51, and a tooth portion 53 opened on the radial inner side of the clamping plate 52.

[0056] When assembling the first shield 1 and the second shield 2, the end of the second shield 2 away from the third positioning mechanism 5 can be aligned with the end side of the first shield 1, and the second groove 222a can be aligned with the positioning member 33 in the radial direction; then, Figure 6 The second shield 2 is pushed into the first shield 1 in the direction B. During the pivoting of the second shield 2, the second grooves 222a on the second inclined section 222 will cooperate with the positioning members 33 one by one, and at the same time, the protrusions 121 will slide accordingly in the slide groove 212; when the second shield 2 is rotated to the bottom and completely accommodated in the first shield 1, the user can manually press the third positioning mechanism 5 to make the teeth 53 act on the outer periphery of the second wall portion 13, so that the second shield 2 can be firmly attached to the first shield 1; if the user wants to remove the second shield 1, the user can act on the pressing plate 51 and the clamping plate 52 to make the teeth 53 detach from the second wall portion 13 and move along the Figure 6 The second shield is pulled out in direction A as shown.

[0057] Furthermore, the second shield 2 and the first shield 1 may become stuck during the pivoting process, and the user cannot pull the second shield 2 even if the third positioning mechanism 5 is used. To deal with this situation, the shield assembly 100 in this embodiment provides a solution, please refer to Figure 7 As shown, a hexagonal reinforcing rib 24 is provided on the axial end surface of the fifth wall portion 23 , and the user can rotate the second protective cover 2 by applying force to the reinforcing rib 24 using a hexagonal wrench.

[0058] The utility model is not limited to the above specific embodiments. A person skilled in the art can easily understand that there are many alternatives to the shield assembly and angle grinder of the utility model without departing from the principle and scope of the utility model. The protection scope of the utility model shall be based on the content of the claims.

Claims

1. A shield assembly, comprising a first shield and a second shield connected to the first shield, wherein the second shield pivots around a center line of the first shield; characterized in that: The shield assembly has a first positioning mechanism connected to the first shield, the first positioning mechanism includes a pressure ring, a plurality of elastic members arranged at intervals on the circumferential end surface of the pressure ring, and a positioning member installed on the first shield and biased by the elastic member, the pressure ring is installed on the first shield, the first shield has a first groove running through it, the first shield has a clamping ring, a first wall portion extending radially from the outer periphery of the clamping ring along the center line, and a second wall portion extending axially from the outer periphery of the first wall portion along the center line, the second wall portion has a first straight section and a first inclined section extending at an angle from the first straight section, the first grooves are distributed at intervals in the first inclined section, the positioning member is accommodated in the first groove and abuts against the second shield, the second shield has a third wall portion arranged parallel to the first wall portion and extending radially along the center line, and a fourth wall portion extending axially from the outer periphery of the third wall portion along the center line, the fourth wall portion has a second straight section and a second inclined section extending at an angle from the second straight section, the second inclined section has second grooves distributed at intervals, and the positioning member is at least partially accommodated in the second groove.

2. The shield assembly according to claim 1, characterized in that: The pressure ring has third grooves which are spaced apart and distributed on the circumferential end surface, and the elastic member is installed in the third grooves.

3. The shield assembly according to claim 2, characterized in that: The shield assembly has a second positioning mechanism that pivotally connects the second shield to the first shield, and the second positioning mechanism includes protrusions spaced apart on the axial end surface of the first wall portion and a pair of ribs protruding from the axial end surface of the third wall portion, and the protrusions slide between the pair of ribs.

4. The shield assembly according to claim 3, characterized in that: The second protective cover has a third positioning mechanism installed on the fourth wall portion, and the third positioning mechanism has a pressing plate for a user to press, a clamping plate connected to the pressing plate, and a tooth portion formed at the end of the clamping plate, and the tooth portion realizes the fixing and release of the second protective cover relative to the first protective cover.

5. The shield assembly according to claim 1, characterized in that: The first inclined section is attached to the radial outer side of the second inclined section, and the pressure ring is attached to the radial outer side of the first inclined section.

6. The shield assembly according to claim 1, characterized in that: The elastic member is a spring, and the positioning member is a steel ball.

7. The shield assembly according to claim 1, characterized in that: The second shield has a fifth wall portion connected to the fourth wall portion. The axial end surface of the fifth wall portion is provided with a reinforcing rib, and the reinforcing rib is hexagonal.

8. An angle grinder, comprising a housing, characterized in that: The angle grinder comprises the guard assembly according to any one of claims 1 to 7.

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