Power tool with adjustable guard angle

Abstract

The present invention relates to a power tool with an adjustable guard angle, comprising: a front cover, an output shaft passing through the front cover, a guard mounted on the front cover, and an elastic member directly abutting between the guard and the front cover. The output shaft is configured to mount a working head, the guard is configured to at least partially surround the working head, and the elastic force of the elastic member enables the guard to reciprocate along the central axis of the output shaft, so that the guard switches between a locked state and a rotation release state; when the guard is in the locked state, the guard is locked with the front cover; when the guard is in the rotation release state, the lock between the guard and the front cover is released, and the guard can rotate relative to the front cover under the action of a driving force. This power tool can achieve the rotation of the guard through a simple structure, thereby being able to adjust the position of the guard, and the operation is simple and convenient. The guard can also be firmly locked on the front cover, improving safety.

Description

Technical Field

[0001] This application relates to the technical field of power tools, and in particular to a power tool with a rotatable and adjustable shield. Background Art

[0002] When using a power tool, in order to prevent debris, wooden boards or weeds from flying around during grinding or cutting, the working head accessories, such as grinding discs, saw blades, and cutting discs, from breaking for some reason, and to prevent users from being accidentally injured by the saw blade, a shield is usually provided. In the existing power tool, the shield is welded to the hoop as a whole, and then the hoop is opened and closed with screws and nuts, and the shield is fixed to the outer periphery of the front cover of the power tool. There is a bump on the hoop that fits into the groove of the front cover to prevent axial slip of the shield, and the hoop radially locks the shield. However, this structure is not reliable in locking. Even when the screw is turned until it cannot rotate, or even until the screw bends, the shield can still rotate around the central axis of the front cover. Therefore, when the user uses this power tool, if the workpiece accidentally touches the shield and the working head accessory breaks, the shield will rotate, which may cause injury to the worker. In addition, the shield cannot limit the range of adjustable angles either. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a power tool with an adjustable shield angle.

[0004] The power tool includes:

[0005] A front cover;

[0006] An output shaft passing through the front cover, and the output shaft is configured to mount a working head;

[0007] A shield mounted on the front cover, and the shield is configured to at least partially surround the working head;

[0008] An elastic member directly abutted between the shield and the front cover, and the elastic force of the elastic member enables the shield to reciprocate along the central axis of the output shaft, so that the shield switches between a locked state and a rotation release state;

[0009] When the shield is in the locked state, the shield is locked to the front cover; when the shield is in the rotation release state, the lock between the shield and the front cover is released, and the shield can rotate relative to the front cover under the action of a driving force.

[0010] Further, the outer periphery of the front cover has a first groove provided circumferentially, and along the central axis, at least two locking grooves are provided on at least one side of the first groove;

[0011] The shield includes a body part and a mounting part. The shield is sleeved on the front cover through the mounting part, and a locking member is provided on the mounting part;

[0012] When the shield is in the rotation release state, the shield is sleeved in the first groove of the front cover, and the shield can rotate relative to the front cover; when the shield is in the locked state, the locking member of the shield is embedded in the locking groove of the front cover to restrict the shield from rotating relative to the front cover.

[0013] Further, it further includes a shaft retaining ring. The front cover further has a second groove provided circumferentially, and the second groove is located below the first groove. The shaft retaining ring is arranged in the second groove of the front cover, and the shaft retaining ring is used to restrict the shield on the front cover.

[0014] Further, a retaining ring is further provided on the outer periphery of the front cover. The retaining ring forms a resisting surface perpendicular to the central axis. One end of the elastic member is fixedly connected to the mounting part of the shield, and the other end abuts against the resisting surface of the front cover.

[0015] Further, on one of the planes perpendicular to the central axis, the locking grooves are provided on the entire circumference of the front cover, so that the shield can rotate 360°, or the locking grooves are provided on a partial circumference of the front cover so that the maximum rotation angle of the shield is less than 360°.

[0016] Further, the front cover has a main body part. On the outer side wall of the main body part, a first shoulder and a second shoulder are provided along the central axis up and down. The first shoulder and the second shoulder are arranged circumferentially along the main body part. The first shoulder, the second shoulder and the outer side wall of the main body part form the first groove. The first shoulder or the second shoulder includes several protrusions arranged at intervals, and the adjacent two protrusions and the outer side wall of the main body part form the locking groove.

[0017] Further, the front cover has a main body part, and the outer side wall of the main body part is recessed inward to form the first groove and the locking groove.

[0018] Further, the locking member is arranged inside the mounting part and protrudes radially from the mounting part. There are several locking members, and each locking member respectively cooperates with one of the locking grooves.

[0019] Further, the inner side wall of the mounting part of the shield can abut against the outer wall of the first shoulder or the second shoulder.

[0020] Further, the elastic member is a spring.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The guard of the power tool can rotate relative to the front cover. Without the aid of tools such as screwdrivers or wrenches, the unlocking and rotation of the guard can be achieved simply by hand movements, enabling the guard to rotate around the central axis of the front cover, thereby enabling the adjustment of the position of the guard to facilitate usage requirements. Moreover, this structure is simple and convenient for users to operate. The guard can also be firmly locked to the front cover, enhancing safety. Description of the Drawings

[0023] Figure 1 It is a partial schematic view of the power tool in this embodiment.

[0024] Figure 2 It is a partial exploded schematic view of the power tool in this embodiment.

[0025] Figure 3a It is the front view of the front cover in this embodiment.

[0026] Figure 3b It is the front view of another front cover in this embodiment.

[0027] Figure 4 It is the top view of the guard in this embodiment.

[0028] Figure 5 It is Figure 1 the cross-sectional view taken along the cutting line A-A in

[0029] Figure 6 It is the partial top view of the power tool in the locked state in this embodiment.

[0030] Figure 7 It is Figure 6 the cross-sectional view taken along the cutting line B-B in

[0031] Figure 8 It is Figure 6 the cross-sectional view taken along the cutting line C-C in Detailed Description of the Embodiment

[0032] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.

[0033] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the art to which this invention pertains. The "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. "Plurality" or "several" means two or more. Unless otherwise indicated, the similar terms such as "front part", "rear part", "lower part" and / or "upper part" are for convenience of description only and are not limited to one position or a spatial orientation. The terms such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The similar terms such as "connect" or "couple" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms of "a", "the" and "said" used in the specification and appended claims of this application are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0034] According to Figure 1 and 2 As shown, the power tool of the present invention includes: a head housing 1, a front cover 3 fixed to the head housing 1, an output shaft 2 accommodated in the head housing 1, the output shaft 2 being configured to mount a working head, a shield 4 sleeved on the front cover 3, and an elastic member 5 disposed between the shield 4 and the front cover 3. The output shaft 2 passes through the front cover 3, and the output shaft 2 is driven by a motor so that the output shaft 2 can rotate along its central axis, and thus the output shaft 2 drives the working head to rotate for operation. When the power tool is an angle grinder, the working head is a blade 21 and can perform cutting or grinding operations. The power tool can also be installed with other working heads as needed.

[0035] In this embodiment, the central axis direction of the output shaft 2 is the vertical direction, the head housing 1 is relatively above, the blade 21 is relatively below, and the rotation direction of the output shaft 2 around the central axis is the circumferential direction.

[0036] In this embodiment, the elastic member 5 directly abuts between the shield 4 and the front cover 3, and the elastic force of the elastic member 5 enables the shield 4 to reciprocate along the central axis of the output shaft 2, so that the shield 4 switches between the locked state and the rotation release state.

[0037] When the shield 4 is in the locked state, the shield 4 is locked with the front cover 3; when the shield 4 is in the rotation release state, the lock between the shield 4 and the front cover 3 is released, and the shield 4 can rotate relative to the front cover 3 under the action of a driving force.

[0038] The power tool can realize the rotation locking function of the shield only by arranging the front cover, the elastic member and the shield, with a simple structure, reducing the number of parts so as to reduce costs, and being convenient to operate and easy for the staff to operate.

[0039] As Figure 3a As shown, the inside of the front cover 3 is hollow for the output shaft 2 to pass through, and the upper end surface of the front cover 3 is fixedly connected to the head shell 1 by screws. The outer periphery of the front cover 3 has a retaining ring 38, a first groove 31 and a second groove 32 arranged circumferentially from top to bottom, and the outer diameter of the retaining ring 38 is larger than the outer diameters of the first groove 31 and the second groove 32. The retaining ring 38 forms a resisting surface 381 perpendicular to the central axis. Along the central axis, at least two locking grooves 33 are arranged on at least one side of the upper and lower sides of the first groove 31.

[0040] A shaft retaining ring 6 is also arranged on the front cover 3. The shaft retaining ring 6 is arranged in the second groove 32 of the front cover 3 by a circlip pliers, and the shaft retaining ring 6 is installed below the shield 4 to block the limit position of the shield 4 moving downward.

[0041] Specifically, in this embodiment, the front cover is as Figure 3a As shown, the front cover 3 has a main body portion 30, and a first shoulder 34, a second shoulder 35 and a third shoulder 36 are arranged up and down along the central axis on the outer side wall of the main body portion 30. The first shoulder 34, the second shoulder 35 and the third shoulder 36 are arranged circumferentially along the main body portion 30 and protrude radially from the main body portion 30. In addition, the outer diameter of the retaining ring 38 of the front cover 3 is larger than the outer diameters of the main body portion 30, the first shoulder 34, the second shoulder 35 and the third shoulder 36. The first shoulder 34, the second shoulder 35 and the third shoulder 36 are integrally formed with the main body portion 30. The first shoulder 34 and the second shoulder 35 and the outer side wall of the main body portion 30 form the first groove 31. The second shoulder 35 includes several spaced protrusions 37a, and the adjacent two protrusions 37a and the outer side wall of the main body portion 30 form the locking groove 33, that is, the locking groove 33 is located below the first groove 31. The second shoulder 35, the third shoulder 36 and the outer side wall of the main body portion 30 form the second groove 32.

[0042] In this embodiment, on one of the planes perpendicular to the central axis, the locking grooves 33 are provided on the entire circumference of the front cover 3, so that the shield 4 can rotate 360° around the front cover 3. Specifically, the second shoulder 35 includes several identical protrusions 37a, and all the protrusions 37a can go around the outer circumference of the front cover 3. The distance between two adjacent protrusions 37a is equal.

[0043] In another embodiment, the locking grooves 33 are provided on a part of the circumference of the front cover 3 so that the maximum rotation angle of the shield 4 is less than 360°. Specifically, as Figure 3b shown in another front cover 3'. The second shoulder 35 includes several short protrusions 37b and a long protrusion 37c. The circumferential length of the short protrusions 37b is less than the length of the long protrusion 37c. Locking grooves 33 are formed between two adjacent short protrusions 37b or long protrusions 37c. Due to the existence of the long protrusion 37c, the shield 4 can only rotate a partial angle around the front cover 3. In the present invention, the maximum rotatable angle of the shield 4 is not specifically limited, and the rotation range of the shield 4 can be selected according to requirements.

[0044] In addition, the distance between two adjacent locking grooves 33 can also be set according to requirements to set the minimum rotation angle of the shield 4, and the present invention does not specifically limit this either.

[0045] In this embodiment, as Figure 4 shown, the shield 4 includes a body part 42 and a mounting part 41. The shield 4 is sleeved on the front cover 3 through the mounting part 41. The body part 42 of the shield 4 can at least partially surround the blade 21 to block the material debris splashed out by the blade 21 during the grinding and cutting operation. The shield 4 is further provided with a locking member 43, which is adapted to the locking groove 33 to lock the shield 4 on the front cover 3.

[0046] Specifically, the locking member 43 of the shield 4 extends radially inward from the inner side of the mounting part 41. The width of the locking member 43 is substantially the same as the width of the locking groove 33 of the front cover 3. The inner diameter of the mounting part 41 is larger than the outer diameter of the first groove 31 of the front cover 3, and the locking member 43 cannot contact the first groove 31 either, so that the shield 4 can rotate around the front cover 3 when sleeved on the first groove 31 of the front cover 3. The inner diameter of the mounting part 41 is equal to the outer diameter of the second shoulder 35, so that when the shield 4 is sleeved on the second shoulder 35 of the front cover 3, the inner side wall of the mounting part 41 can abut against the outer wall of the second shoulder 35, and the locking member 43 of the shield 4 is fitted into the locking groove 33 of the front cover 3 to limit the rotation of the shield 4 relative to the front cover 3.

[0047] One end of the elastic member 5 can be fixedly connected to the mounting portion 41 of the shield 4 by means such as welding, and the other end abuts against the resisting surface 381 of the front cover 3. The elastic member 5 enables the shield 4 to reciprocate along the central axis, realizing the switching of the shield 4 between the locked state and the rotation release state.

[0048] When the shield 4 is in the rotation release state, the shield 4 is sleeved in the first groove 31 of the front cover 3, and the shield 4 can rotate relative to the front cover 3. When the shield 4 is in the locked state, as Figure 5 shown, the locking member 43 of the shield 4 is fitted into the locking groove 33 of the front cover 3 to restrict the rotation of the shield 4 relative to the front cover 3. To further enhance the locking effect, there are several locking members 43, and each locking member 43 is respectively locked with one of the locking grooves 33. In this embodiment, three locking members 43 are provided on the shield 4 to enhance the locking effect.

[0049] In this embodiment, the shield 4 of the power tool can rotate relative to the front cover 3, allowing the user to rotate the shield 4 at different angles to adjust the position of the shield 4 relative to the blade. In the locked state, as Figure 5 shown, by inserting the locking member 43 of the shield 4 into the locking groove 33 of the front cover 3, and the inner side wall of the mounting portion 41 of the shield 4 also abuts against the outer wall of the first shoulder 34 or the second shoulder 35 of the front cover 3, the shield 4 is locked to the front cover 3, restricting the rotation of the shield 4 relative to the front cover 3. This locking structure has better locking stability through the structural cooperation between the shield 4 and the front cover 3, rather than being fixed by screws, and the structure is simple.

[0050] In this embodiment, the elastic member 5 is preferably a spring. When the shield 4 is in the locked state, the spring is in its original state. When the shield 4 is in the rotation release state, the spring is in an elastically deformed state.

[0051] The following will elaborate on the specific process of adjusting the position angle of the shield 4:

[0052] Normally, the shield 4 is in the locked state, as Figure 5 、 7 and 8 shown, at this time the mounting portion 41 of the shield 4 is located at the second shoulder 35 of the front cover 3, the inner side wall of the mounting portion 41 abuts against the outer wall of the second shoulder 35 of the front cover 3, and the locking member 43 of the shield 4 is inserted into the locking groove 33 of the front cover 3, and the shield 4 and the front cover 3 act against each other to restrict the movement of the shield 4.

[0053] If the shield 4 is to be unlocked, a force is applied to the shield 4 upward along the central axis. The force overcomes the elastic force of the spring and moves the shield 4 upward until its mounting portion 41 moves to the first groove 31. Since the inner diameter of the mounting portion 4 of the shield 4 is larger than the outer diameter of the first groove 31, and the locking member 43 of the shield 4 does not conflict with the first groove 31, the mounting portion 4 of the shield 4 can rotate when it is sleeved outside the first groove 31. At this time, the shield 4 is in a rotation release state. At this time, the shield 4 can be rotated to adjust its position relative to the front cover 3. Rotate the shield 4 to the desired position, and note that the locking member 43 of the shield 4 needs to be aligned with the locking groove 33 of the front cover 3.

[0054] When the shield 4 is rotated to the required angle, the driving force on the shield 4 is released. The shield 4 is pushed downward along the central axis by the elastic force of the spring until the locking piece 43 of the shield 4 is engaged with the locking groove 33 of the front cover 3, and the inner side wall of the mounting portion 41 of the shield 4 abuts against the outer side wall of the second shoulder 35 of the front cover 3, thereby locking the shield 4 again.

[0055] The shield 4 has a simple structure, and the operation of adjusting the position of the shield 4 is also simple and convenient. There is no need to disassemble the shield 4, and there is no need to use tools such as screwdrivers and wrenches to unlock the shield 4. Only two hands are needed to apply driving force to the shield 4 to unlock the shield 4 and rotate it around the central axis of the front cover 3. In addition, the shield 4 is locked and tightly locked with the front cover 3 when locked, and it is not easy to rotate and shake when the power tool is working, which effectively improves safety.

[0056] In another embodiment, the main difference is that the locking groove 33 is formed by the first shoulder 34. Specifically, the first shoulder 34 includes a plurality of protrusions 37a arranged at intervals, and two adjacent protrusions 37a and the outer side wall of the main body 30 form the locking groove 33, that is, the locking groove 33 is located above the first groove 31. Therefore, if the shield 4 is to be unlocked, it is necessary to apply a force downward along the central axis to the shield 4 so that the shield 4 moves downward until its mounting portion 41 is sleeved in the first groove 31, and the rotation of the shield 4 can be realized at this time.

[0057] In addition, in other embodiments, the first groove 31, the second groove 32 and the locking groove 33 on the front cover 3 can be formed by the outer wall of the main body 30 being recessed inward. The first groove 31 and the second groove 32 form the neck of the main body 30. The first groove 31, the second groove 32 and the locking groove 33 of the front cover 3 can be formed by other methods, and the present invention is not limited thereto.

[0058] The above are only the preferred embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present application by using the disclosed technical content above. However, as long as it does not depart from the technical content of the present application, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An electric tool with an adjustable guard angle, characterized in that, Comprising: A front cover; the outer periphery of the front cover has a first groove arranged circumferentially, and at least two locking grooves are arranged on at least one side of the first groove along the central axis. An output shaft passing through the front cover, and the output shaft is configured to mount a working head. A shield installed on the front cover, the shield is configured to at least partially surround the working head, the shield includes a body portion and a mounting portion, the shield is sleeved on the front cover through the mounting portion, and a locking member is arranged on the mounting portion. An elastic member directly abuts between the shield and the front cover, and the elastic force of the elastic member enables the shield to reciprocate along the central axis of the output shaft, so that the shield switches between a locked state and a rotation release state. When the shield is in the locked state, the locking member of the shield is embedded in the locking groove of the front cover to limit the rotation of the shield relative to the front cover, and the shield is locked with the front cover; when the shield is in the rotation release state, the shield is sleeved in the first groove of the front cover, the lock between the shield and the front cover is released, and the shield can rotate relative to the front cover under the action of a driving force.

2. The power tool with adjustable guard angle according to claim 1, wherein It further includes a shaft retaining ring. The front cover further has a second groove arranged circumferentially, and the second groove is located below the first groove. The shaft retaining ring is arranged in the second groove of the front cover, and the shaft retaining ring is used to limit the shield on the front cover.

3. The power tool with adjustable shield angle according to claim 1, wherein A retaining ring is further arranged on the outer periphery of the front cover, the retaining ring forms a resisting surface perpendicular to the central axis, one end of the elastic member is fixedly connected to the mounting portion of the shield, and the other end abuts against the resisting surface of the front cover.

4. The electric tool with an adjustable guard angle according to claim 1, wherein On one of the planes perpendicular to the central axis, the locking grooves are arranged on the entire circumference of the front cover, so that the shield can rotate 360°, or the locking grooves are arranged on a partial circumference of the front cover so that the maximum rotation angle of the shield is less than 360°.

5. The electric tool with an adjustable guard angle according to claim 1, wherein The front cover has a main body portion, and a first shoulder and a second shoulder are arranged up and down along the central axis on the outer side wall of the main body portion. The first shoulder and the second shoulder are arranged circumferentially along the main body portion. The first shoulder, the second shoulder and the outer side wall of the main body portion form the first groove. The first shoulder or the second shoulder includes several protrusions arranged at intervals, and adjacent two protrusions and the outer side wall of the main body portion form the locking groove.

6. The electric tool with an adjustable guard angle according to claim 1, wherein, The front cover has a main body portion, and the outer side wall of the main body portion is recessed inward to form the first groove and the locking groove.

7. The power tool with an adjustable guard angle according to claim 1, wherein, The locking member is arranged on the inner side of the mounting portion and protrudes radially from the mounting portion. There are several locking members, and each locking member cooperates with one of the locking grooves respectively.

8. The electric tool with adjustable shield angle according to claim 5, characterized in that, The inner side wall of the mounting portion of the shield can abut against the outer wall of the first shoulder or the second shoulder.

9. The electric tool with an adjustable guard angle according to claim 1, wherein The elastic member is a spring.

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