Power tool

Abstract

The application discloses an electric tool, comprising: a shaft lock assembly, comprising a first state of limiting rotation of an output shaft and a second state of releasing rotation of the output shaft; the shaft lock assembly comprises a first shaft lock piece and a second shaft lock piece moving relative to the first shaft lock piece; wherein, when the second shaft lock piece is in a first position, the second shaft lock piece is engaged with the first shaft lock piece; when the second shaft lock piece is in a second position, the second shaft lock piece is disengaged from the first shaft lock piece; an operation assembly is used for switching the state of the shaft lock assembly; a locking assembly is configured to be driven to make the second shaft lock piece in the first position and limit the second shaft lock piece from moving to the second position, and when being driven again, allow the second shaft lock piece to be displaced from the first position to the second position. The electric tool is convenient to operate and has high safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power tools. BACKGROUND

[0002] The existing rotary power tools, such as table saws, circular saws, miter saws, router and edge banders, etc., need to press the shaft lock button with one hand and replace the saw blade with the other hand when replacing the working element such as the saw blade or the grinding blade, which is inconvenient and time-consuming and laborious. When the operating assembly is needed to start the shaft lock mechanism, the components that realize the locking function of the output shaft of the shaft lock are not necessarily in a state of mutual alignment, and the user needs to first manually adjust them to the specified position to align them, so that the operating assembly can be triggered or the two components can be connected to lock the rotation of the output shaft. SUMMARY

[0003] To solve the problems of the prior art, the purpose of the present application is to provide a cutting tool that does not need to be pressed continuously and does not need to be manually aligned.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solution:

[0005] A power tool, comprising: a motor comprising a drive shaft rotating about a first axis; an output shaft for connecting a working accessory; the output shaft is driven by the motor to rotate about a second axis; further comprising: a shaft lock mechanism, comprising: a shaft lock assembly comprising a first state of restricting the rotation of the output shaft and a second state of releasing the rotation of the output shaft; the shaft lock assembly comprises: a first shaft lock member and a second shaft lock member moving relative to the first shaft lock member; wherein, when the second shaft lock member is in a first position, the second shaft lock member engages with the first shaft lock member; when the second shaft lock member is in a second position, the second shaft lock member disengages from the first shaft lock member; an operating assembly for switching the state of the shaft lock assembly; a locking assembly configured to be driven to cause the second shaft lock member to be in the first position and restrict the movement of the second shaft lock member to the second position, and when driven again, allow the second shaft lock member to be displaced from the first position to the second position.

[0006] In some embodiments, the first shaft lock member is provided with a locking portion, the second shaft lock member can selectively engage or disengage the locking portion, and the shaft lock assembly further comprises: a first biasing element providing a biasing force to move the first shaft lock member in the direction of engaging the locking portion when the first shaft lock member engages with the second shaft lock member, the shaft lock assembly is in the first state when the second shaft lock member engages with the locking portion, and the shaft lock assembly is in the second state when the second shaft lock member disengages from the locking portion.

[0007] In some embodiments, the second shaft lock member moves relative to the first shaft lock member in the direction of a third axis perpendicular to the second axis.

[0008] In some embodiments, the operating assembly reciprocates along the third axis.

[0009] In some embodiments, the locking assembly comprises: a locking protrusion and a receiving portion, wherein the locking protrusion is connected to the operation assembly and the second shaft lock, and the receiving portion is formed with or connected with a first groove and a second groove formed along the direction of the third axis, when the shaft lock assembly is in the first state, the locking protrusion is at least partially embedded in the first groove, and when the shaft lock assembly is in the second state, the locking protrusion is at least partially embedded in the second groove.

[0010] In some embodiments, the locking assembly further comprises: a second biasing element, which generates a biasing force for the locking protrusion in the direction of embedding the locking protrusion into the first groove or the second groove.

[0011] In some embodiments, the operation assembly drives the locking protrusion to move between the first groove and the second groove.

[0012] In some embodiments, the first shaft lock comprises: a shaft lock disc formed on or connected to the output shaft, and the locking portions are discretely arranged along the outer periphery of the shaft lock disc.

[0013] In some embodiments, the second shaft lock comprises: a shaft lock rod connected to the locking assembly.

[0014] In some embodiments, the driving force of the operation assembly is transmitted to the second shaft lock through the locking mechanism.

[0015] The electric tool of the present application does not need to continuously press the shaft lock operation assembly when replacing the saw blade, and does not need to cooperate with the manual adjustment of the starting shaft lock mechanism to be in place. The user only needs to trigger the operation assembly once, and the shaft lock mechanism can lock the rotation of the output shaft. The locking assembly is used to limit the position of the second shaft lock. Compared with locking the second shaft lock by limiting the operation assembly, the locking of the present application is more stable, simple to operate, and high in safety. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of a partial cross-sectional view of the electric tool of the first embodiment;

[0017] Figure 2 is a schematic view of the shaft lock mechanism and the output shaft of the first embodiment;

[0018] Figure 3 is a schematic view of another view of the shaft lock mechanism and the output shaft of the first embodiment, and the shaft lock assembly is in the first state;

[0019] Figure 4 is a cross-sectional view of Figure 3 ;

[0020] Figure 5 is an exploded view of Figure 3 ;

[0021] Figure 6 is a schematic view of Figure 5a cross-sectional view of

[0022] Figure 7 is a schematic view of the shaft lock mechanism and output shaft of the second embodiment, the shaft lock assembly in the first state;

[0023] Figure 8 is a cross-sectional view of Figure 7

[0024] Figure 9 is a schematic view of the shaft lock mechanism and output shaft of the second embodiment, the shaft lock assembly in the second state;

[0025] Figure 10 is a cross-sectional view of Figure 9

[0026] Figure 11 is a schematic view of the shaft lock mechanism and output shaft of the third embodiment, the shaft lock assembly in the first state;

[0027] Figure 12 is a cross-sectional view of Figure 11

[0028] Figure 13 is an exploded view of Figure 11

[0029] Figure 14 is a cross-sectional view of Figure 11

[0030] Figure 15 is a schematic view of a perspective view of the power tool of the fourth embodiment;

[0031] Figure 16 is a schematic view of a perspective view of the drive mechanism, output shaft and shaft lock mechanism of the fourth embodiment, the shaft lock assembly in the first state;

[0032] Figure 17 is a schematic view of another view of Figure 16

[0033] Figure 18 is a schematic view of the shaft lock assembly in the second state in Figure 16

[0034] Figure 19 is a schematic view of another view of Figure 18

[0035] Figure 20 is a schematic view of a perspective view of the stop of the fourth embodiment;

[0036] Figure 21 is a schematic view of the first shaft lock piece of the fourth embodiment;

[0037] Figure 22 ​​​​​​​​is a schematic diagram of the fifth embodiment of the electric power tool after part of the housing is removed;

[0038] Figure 23 is a schematic diagram of the first shaft lock of the fifth embodiment;

[0039] Figure 24 is a schematic diagram of the driving mechanism, the output shaft and the shaft lock mechanism of the fifth embodiment;

[0040] Figure 25 is a schematic diagram of the fifth embodiment of the electric power tool after part of the housing is removed;

[0041] Figure 26 is a schematic diagram of the driving mechanism, the output shaft and the shaft lock mechanism of the sixth embodiment;

[0042] Figure 27 is an exploded view of the sixth embodiment; Figure 26

[0043] Figure 28 is a partial enlarged schematic diagram of the curved slot on the shaft lock plate of the sixth embodiment, Figure 27 is the F part in

[0044] Figure 29 is a schematic diagram of the position relationship of the limiting part, the receiving part and the guide when the shaft lock assembly of the sixth embodiment is in the second state;

[0045] Figure 30 is a schematic diagram of the position relationship of the limiting part, the receiving part and the guide when the shaft lock assembly of the sixth embodiment is in the first state. DETAILED DESCRIPTION

[0046] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] ​In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0049] Referring to Figure 1 The first embodiment of the electric tool of the present application is taken as an example of an electric circular saw in the present embodiment.

[0050] Referring to Figures 1-6 As shown in the figure, the electric circular saw 100 includes a motor 11, an output shaft 12, a housing 13 and a shaft lock mechanism 15. Among them, the output shaft 12 is used to connect a rotating cutting element, which is a saw blade 16 in the present embodiment. The housing 13 includes a receiving portion 131, and the motor 11 is placed in the receiving portion 131. The output shaft 12 is at least partially disposed in the receiving portion 131. It should be noted that the motor 11 in the present application is specifically provided as a motor 11, and hereinafter the motor shaft 111 will be replaced by the motor shaft 111, but it cannot be regarded as a limitation of the present application. The motor 11 includes a drive shaft 111, which rotates about a first axis 101, and hereinafter the motor shaft 111 will be replaced by the motor shaft 111, but it cannot be regarded as a limitation of the present application.

[0051] A first gear (not shown in the figure) is connected to the motor shaft 111. In other embodiments, the first gear can be formed on the motor shaft 111 and integrated with the motor shaft 111. A second gear 143 is connected to the output shaft 12, and the second gear 143 is engaged with the first gear. By driving the first gear 142 to rotate by the motor shaft 111, the first gear drives the second gear 143 and the output shaft 12 to rotate as a whole about a second axis 102, which intersects the first axis 101 in the present embodiment. In other alternative embodiments, the second axis 102 is perpendicular or parallel to the first axis 101.

[0052] The shaft lock mechanism 15 is used to lock the rotation of the output shaft 12 about the second axis 102, and the shaft lock mechanism 15 is at least partially disposed in the receiving portion 131 of the housing 13.

[0053] The shaft locking mechanism 15 comprises a shaft locking assembly 15a, an operating assembly 15b and a locking assembly 15c. The shaft locking assembly 15a is configured to have a first state in which the output shaft 12 is locked against rotation about the second axis 102 and a second state in which the output shaft 12 is allowed to rotate about the second axis 102. When the shaft locking assembly 15a is in the first state, the rotation of the output shaft 12 is locked, i.e. the output shaft 12 is directly locked or the rotation of the output shaft 12 is locked by locking the rotation of the second gear 143. When the shaft locking assembly 15a is in the second state, the rotation of the output shaft 12 is released, i.e. the second gear 143 and the output shaft 12 as a whole can be driven to rotate about the second axis 102 by the first gear 142.

[0054] The shaft locking assembly 15a comprises a first shaft locking member 152, a second shaft locking member 151 and a first biasing element 157. The second shaft locking member 151 is configured to move relative to the first shaft locking member 152. The second shaft locking member 151 is configured to have a first position and a second position. When the second shaft locking member 151 is in the first position, the second shaft locking member 151 is engaged with the first shaft locking member 152. In this case, the shaft locking assembly 15a can be in the first state or the second state. When the second shaft locking member 151 is in the second position, the second shaft locking member 151 is disengaged from the first shaft locking member 152. In this case, the shaft locking assembly 15a is in the second state. In the present embodiment, the first shaft locking member 152 is provided with a locking portion 152a. The second shaft locking member 151 is selectively connected to or disengaged from the locking portion 152a. When the second shaft locking member 151 is connected to the locking portion 152a, the shaft locking assembly 15a is in the first state. When the second shaft locking member 151 is disengaged from the locking portion 152a, the shaft locking assembly 15a is in the second state. When the second shaft locking member 151 is in the first position, the second shaft locking member 151 is in contact with a non-locking portion. The first biasing element 157 provides a biasing force to move the first shaft locking member 152 towards the locking portion 152a. In the present embodiment, the first biasing element 157 is a first compression spring.

[0055] The operating assembly 15b is at least partially arranged outside the housing 13 for being operated by a user to switch the state of the shaft locking mechanism. Each time the operating assembly 15b is triggered, the second shaft locking member 151 is switched between the first position and the second position. That is, if the second shaft locking member 151 is in the second position, the operating assembly 15b is triggered once and the second shaft locking member 151 is moved from the second position to the first position. If the operating assembly 15b is triggered again, the second shaft locking member 151 is moved from the first position to the second position.

[0056] The locking assembly 15c is driven by the operation assembly 15b to drive the second shaft lock 151. When the second shaft lock 151 is in the first position, the locking assembly 15c prohibits the second shaft lock 151 from moving to the second position. When the operation assembly 15b is triggered again to drive the locking assembly 15c again, the second shaft lock 151 is allowed to move from the first position to the second position. When the user replaces the saw blade, the user does not need to hold the operation assembly of the shaft lock mechanism with one hand to lock the rotation of the output shaft. When the user triggers the operation assembly again, the locking assembly releases the shaft lock assembly, and the shaft lock assembly switches to the second state for normal use of the machine. By using the locking assembly to limit the position of the second shaft lock, compared with locking the second shaft lock by limiting the operation assembly, the locking of the present application is more stable, and the situation that the operation assembly placed outside the machine is mistakenly touched to change the locking state is reduced.

[0057] Specifically, when the shaft lock mechanism needs to be started to replace the saw blade, the second shaft lock 151 is in the second position. When the operation assembly 15b is triggered, the second shaft lock 151 moves from the second position to the first position. At this time, whether the second shaft lock 151 is engaged with the locking portion 152a or not, the locking assembly 15c limits the movement of the second shaft lock 151 from the first position to the second position. If the second shaft lock 151 is engaged with the locking portion 152a, the shaft lock assembly 15a is in the first state at this time. If the second shaft lock 151 is engaged with the non-locking portion 152a, the first biasing element 157 is compressed to be in an energy storage state. When the saw blade is replaced, the output shaft is rotated by an external force. When the second shaft lock 151 is aligned with the locking portion 152a, the energy released by the first biasing element 157 drives the second shaft lock 151 to engage with the locking portion 152a. At this time, the shaft lock assembly 15a is in the first state. When the operation assembly 15b is triggered again, the locking assembly 15c allows the second shaft lock 151 to move from the first position to the second position, that is, the second shaft lock 151 is disengaged from the locking portion 152a. At this time, the shaft lock assembly 15a is in the second state, and the rotation of the output shaft 12 is released. The shaft lock mechanism of the present application keeps the position of the second shaft lock 151 by the locking assembly 15c when the saw blade 16 is removed, and the output shaft 12 can be locked without triggering the operation assembly 15b with one hand. At the same time, the operation assembly 15b and the locking assembly 15c can be triggered when the locking portion 152a and the second shaft lock 151 are in any position relative to each other, without adjusting the second shaft lock 151 and the locking portion 152a. The shaft lock mechanism of the present application only needs to be triggered once by the user to trigger the operation assembly 15b, which is convenient for the user to operate and ensures the safety of the user.

[0058] In the embodiment, the first shaft locking member 152 is a shaft locking disc, which is connected to the output shaft 12 and forms an integral whole with the output shaft 12 to rotate about the second axis 102. For convenience, the shaft locking disc 152 is used instead of the first shaft locking member 152, but it cannot be regarded as a limitation to the present application.

[0059] The outer circumferential surface of the shaft locking disc 152 is provided with a plurality of clamping grooves, which are arranged at the same distance or angle. In the embodiment, four clamping grooves are arranged circumferentially, all of which extend along the radial direction of the shaft locking disc 152 towards the center of the circle, and the openings are directed to the outside of the shaft locking disc 152. The four clamping grooves are arranged at an interval of 90°. A guide surface 1522 is arranged between two adjacent clamping grooves. In the embodiment, the guide surface 1522 is a circular arc surface, and the clamping grooves on both sides of the circular arc surface are located at the lowest point of the circular arc surface.

[0060] The second shaft locking member 151 is a shaft locking rod. For convenience, the shaft locking rod 151 is used instead of the second shaft locking member 151, but it cannot be regarded as a limitation to the present application. The shaft locking rod 151 is driven by the locking assembly 15c. In the embodiment, the shaft locking rod 151 moves along the direction of the third axis 103. In the embodiment, the third axis 103 is perpendicular to the second axis 102. The moving direction of the shaft locking rod 151 is adapted to the opening direction of the clamping grooves of the shaft locking disc 152, so in other alternative embodiments, the shaft locking rod 151 can move along the direction parallel to the second axis or rotate about the second axis, which is not limited herein.

[0061] The operating assembly 15b includes a pressing member 153. The pressing member 153 partially extends outside the housing 13, and a user directly presses on the pressing member 153 to switch the shaft locking rod 151 between the first position and the second position. The moving direction of the pressing member 153 is consistent with the shaft locking rod 151, both of which reciprocate along the third axis 103.

[0062] The shaft locking mechanism 15 further includes a reset elastic member 154, which is used to provide a reset driving force for the second shaft locking member 151 to return from the first position to the second position. Preferably, the reset elastic member 154 is a compression spring.

[0063] In the embodiment, when the shaft locking rod 151 is in the second position, the pressing piece 153 is moved along the third axis 103 into the housing, and the pressing piece 153 drives the shaft locking rod 151 to move along the third axis 103 towards the shaft locking disc 152 from the second position to the first position. When the shaft locking rod 151 is in the first position, the shaft locking rod 151 can abut against the guide surface 1522 or be partially embedded in the clamping groove according to the random stop position of the output shaft 12. At this time, the locking assembly 15c limits the movement of the shaft locking rod 151 along the third axis 103 away from the shaft locking disc 152, regardless of whether the shaft locking rod 151 is partially embedded in the clamping groove. If the shaft locking rod 151 is directly opposite the clamping groove below along the third axis 103, the shaft locking rod 151 directly extends into the clamping groove, and the shaft locking assembly 15a is in the first state. If the shaft locking rod 151 is located between adjacent clamping grooves, that is, the shaft locking rod 151 abuts against the guide surface 1522, at this time the first biasing element 157 is compressed and is in an energy storage state. The shaft locking rod 151 is kept under the pressure of the first biasing element 157 at this time. When the saw blade replacement work is performed, the output shaft 12 is rotated by an external force, the shaft locking rod 151 slides along the guide surface 1522, and the shaft locking rod 151 is aligned with the adjacent clamping groove. At this time, the energy released by the first biasing element 157 drives the shaft locking rod 151 to be partially embedded in the clamping groove, and the shaft locking assembly 15a is in the first state. When the pressing piece 153 is triggered again, the locking assembly 15c releases the restriction on the movement of the shaft locking rod 151 to the second position, and the reset elastic element 154 drives the shaft locking rod 151 to reset to the second position. At this time, the shaft locking assembly 15a is in the second state, and the rotation of the output shaft 12 is released.

[0064] The locking assembly 15c includes a receiving portion 155, a locking boss 156, and a second biasing element. The receiving portion 155 surrounds at least part of the outside of the locking boss 156. In the embodiment, the receiving portion 155 is a cylindrical housing, and an accommodation cavity is arranged inside the receiving portion 155. The pressing piece 153 is partially arranged in the accommodation cavity. The locking boss 156 includes a first end 1561 and a second end 1562. The first end 1561 is connected to the pressing piece 153, and the second end 1562 is connected to the shaft locking rod 151. The locking boss 156 is provided with an accommodation cavity at the second end 1562, and the shaft locking rod 151 is arranged in the accommodation cavity. The shaft locking rod 151 extends into and slides in the accommodation cavity. A plurality of boss portions 1563 are arranged on the outer periphery of the locking boss 156. The boss portions 1563 are uniformly arranged in the circumferential direction on the outer periphery of the locking boss 156. One end of the boss portion 1563 extends to the second end 1562 along the third axis 103, and the other end of the boss portion 1563 extends to the connection with the pressing piece 153 along the third axis 103.

[0065] The inner side wall of the receiving part 155 extends in the direction of the third axis 103 to form a first groove 1551 and a second groove 1552, wherein a plurality of first grooves 1551 and a plurality of second grooves 1552 are arranged, and one second groove 1552 is arranged between every two first grooves 1551. The distance between every two first grooves 1551 is the same as the distance between every two boss parts 1563, and the distance between every two second grooves 1551 is the same as the distance between every two boss parts 1563. The width of the first groove 1551 and the second groove 1552 is adapted to the boss part 1563, and the boss part 1563 can be at least partially embedded in the first groove 1551 and the second groove 1552. The opening part of the first groove 1551 and the second groove 1552 is towards the second end 1562 of the locking boss 156. The first groove 1551 and the second groove 1552 extend along the third axis 103 towards the first end 1561 of the locking boss 156. The extension depth of the first groove 1551 is less than the extension depth of the second groove 1552, that is to say, when the boss part 1563 stops moving along the third axis 103 in the first groove 1551, the distance between the second end 1562 and the output shaft 12 is smaller than when the boss part 1563 stops moving along the third axis 103 in the second groove 1552. Therefore, when the operation assembly 15b is in the first position, when the boss part 1563 is partially embedded in the first groove 1551 and stops moving along the third axis 103, the shaft locking rod 151 is embedded in the clamping groove. When the operation assembly 15b is in the second position, when the boss part 1563 is partially embedded in the second groove 1552 and stops moving along the third axis 103, the shaft locking rod 151 is separated from the clamping groove.

[0066] A first guide surface 1553 is arranged between the opening part of each first groove 1551 and each second groove 1552, and a second guide surface 1564 is arranged on the boss part 1563 in cooperation with the first guide surface 1553. The first guide surface 1553 and the second guide surface 1564 are in contact, driving the locking boss 156 to rotate about the third axis 103. The third guide surface 1531 is arranged on the pressing piece 153 at the connection with the boss part 1563, and the third guide surface 1531 and the second guide surface 1564 are in contact, driving the locking boss 156 to rotate about the third axis 103, and the direction of rotation is the same as when the first guide surface 1553 and the second guide surface 1564 are in contact.

[0067] The second biasing element generates a biasing force for the locking cam 156 to drive the cam portion 1563 towards the first recess 1551 or the second recess 1552. In the present embodiment, the second biasing element is the same component as the return spring 154. In alternative embodiments, the biasing element can be a separate component. Preferably, the second biasing element is a compression spring. In the present embodiment, the second end 1562 of the locking cam 156 is connected to the return spring 154.

[0068] With reference to the transition of the shaft lock assembly 15a from the second state to the first state, the cam portion 1563 is driven to move towards the inside of the housing 13 by the presser 153. The cam portion 1563 is driven to move along the third axis 103 towards the inside of the housing 13, i.e. the second end 1562 of the locking cam 156 is driven to move towards the output shaft 12. The cam portion 1563 is driven to move towards the opening of the second recess 1552. When the cam portion 1563 is disengaged from the second recess 1552, the third guide surface 1531 on the presser 153 drives the second guide surface 1564 of the locking cam 156 to rotate the locking cam 156 about the third axis 103 so that the second guide surface 1564 is aligned with the first guide surface 1553. When the presser 153 is no longer driven to move towards the inside of the housing 13, the second biasing element drives the locking cam 156 to move towards the outside of the housing 13. When the second guide surface 1564 is in contact with the first guide surface 1553, the first guide surface 1553 drives the locking cam 156 to continue to rotate about the third axis 103 so that the cam portion 1563 is engaged in the first recess 1551 and stops moving along the third axis 103. At this time, the shaft lock lever 151 is engaged in the slot, and the shaft lock assembly 15a is in the first state. Since the biasing element continuously drives the cam portion 1563 towards the first recess 1551, the cam portion 1563 remains engaged in the first recess 1551 and stops moving along the third axis 103 without the need to continuously apply a pressing force to the presser 153. The position of the shaft lock lever 151 remains unchanged, and the first state of the shaft lock assembly 15a is locked. When the first state of the shaft lock assembly 15a is switched to the second state, the user again drives the presser 153 to move towards the inside of the housing 13. The movement of the locking cam is different from the above-mentioned movement. The cam portion 1563 is engaged in the second recess 1552, and thus the shaft lock lever 151 is disengaged from the slot.

[0069] With reference to Figures 7-10 The second embodiment of the shaft lock mechanism is different from the first embodiment only in the operation assembly and the locking assembly.

[0070] The operating assembly 25b in the shaft locking mechanism 25 includes a pusher 253, which is partially arranged outside the accommodating portion of the housing and is used by a user to push and reciprocate the pusher 253 on the housing along a fourth axis 204. In this embodiment, the fourth axis 204 is spatially perpendicular to the second axis 102. The portion of the pusher 253 towards the housing is provided with a first step surface 2531 and a second step surface 2532 extending towards the output shaft 22 along a third axis 203. The first step surface 2531 and the second step surface 2532 are both parallel planes of the fourth axis 204, and the first step surface 2531 and the second step surface 2532 are provided with a height difference, and the first step surface 2531 is closer to the output shaft 22 than the second step surface 2532.

[0071] The locking assembly 25c includes a first locking member 256 and a second biasing element 254. The first locking member 256 includes a first end 2561 and a second end 2562. The first end 2561 is close to the pusher 253, and the second end 2562 is close to the output shaft 22 and is connected to the shaft locking rod 251. The first end 2561 includes a third step surface 2563 arranged away from the output shaft 22 along the third axis 103, and the third step surface 2563 is a parallel plane of the fourth axis 204.

[0072] The pusher 253 is provided with a limiting portion at the contact with the housing, so that when the pusher 253 reciprocates, the limiting portion limits the movement of the pusher 253 in the direction of the third axis 203.

[0073] One end of the second biasing element 254 is connected to the first locking member 256, and the other end is connected to the accommodating portion or other components that do not move with the shaft locking mechanism 25. The second biasing element 254 generates a biasing force for the first locking member 256 to move towards the pusher, and preferably, the second biasing element 254 is a compression spring.

[0074] In the present embodiment, when the second step surface 2532 contacts the third step surface 2563, the first locking member 256 is farthest from the output shaft 22, the shaft locking rod 251 is disengaged from the clamping groove 2521, and the shaft locking assembly is in the second state. In other alternative embodiments, the second step surface and the third step surface can be provided with a structure of mutual embedding, to ensure stable contact between the second step surface and the third step surface, and relative movement can only occur when external force exceeds a preset force. When it is necessary to switch the shaft locking assembly from the second state to the first state, the push member 253 is pushed in the direction of the fourth axis 204, and the first step surface 2531 starts to move towards the third step surface 2563 until the first step surface 2531 abuts against the third step surface 2563, at which time the first locking member 256 is closest to the output shaft 22, and the shaft locking assembly is in the first state. Since the second biasing element 254 generates a biasing force for the first locking member 256 to move in the direction of the push member 253, in the present embodiment, a compression spring provides a pushing force in the direction of the third axis 203. At the same time, the first step surface 2531 and the third step surface 2563 are two planes parallel to the fourth axis 204, and the driving force generated by the second biasing element 254 will make the first step surface 2531 and the third step surface 2563 directly abut against each other, but will not generate a component force in the direction of the fourth axis 204, so that the push member 253 and the first locking member 256 do not move relative to each other, and the shaft locking assembly is kept in the first state. In other alternative embodiments, the first step surface and the third step surface can be provided with a structure of mutual embedding, to ensure stable contact between the first step surface and the third step surface, and relative movement can only occur when external force exceeds a preset force. When the shaft locking assembly needs to be switched from the first state to the second state, the push member 253 is pushed in the opposite direction of the fourth axis 204. The second step surface 2532 starts to slide towards the third step surface 2563, and when the first step surface 2531 is disengaged from the third step surface 2563, the second biasing element 254 pushes the first locking member 256 towards the push member 253. The second step surface 2532 contacts the third step surface 2563, and the shaft locking assembly is in the second state.

[0075] Referring to Figures 13-14 In the third embodiment of the shaft locking mechanism of the present scheme, the difference is only in the operation assembly and the locking assembly.

[0076] In the shaft locking mechanism 35, the operation assembly 35c includes a knob member 353, part of which is arranged outside the accommodating portion of the housing, for the user to rotate, so that the knob member 353 rotates on the housing with the third axis 303 as the axis, and the third axis 303 is perpendicular to the second axis 102.

[0077] The locking assembly 35c comprises a first locking member 356 and a second biasing member 354. The first locking member 356 comprises a first end 3561 and a second end 3562. The first end 3561 is proximate to the knob member 353 and the second end 3562 is proximate to the output shaft 12 and the second end 3562 is connected to the shaft locking lever 351. The first end 3561 is provided with a first surface 3564.

[0078] The knob member 353 is provided with a stopper at the housing contact position to limit the movement of the knob member 353 along the third axis 303 when the knob member 353 is rotated about the third axis 303.

[0079] The second biasing member 354 is connected to the second locking member 356 at one end and is connected to the housing or other component that does not move with the shaft locking mechanism 35 at the other end. The second biasing member 354 generates a biasing force that drives the first locking member 356 to move towards the knob member 353. Preferably, the second biasing member 354 is a compression spring.

[0080] The knob member 353 is connected to the first surface 3564 of the second locking member 356. The contact surface of the knob member 353 and the first surface 3564 is provided with a height difference, and the second locking member 356 moves linearly along the third axis 303 when the knob member 353 is rotated about the third axis 303. In this embodiment, the knob member 353 is connected to the first surface 3564 through a beveled surface. In other alternative embodiments, the knob member 353 is connected to the first end 3561 through a threaded or helical tooth engagement.

[0081] Referring to Figures 15-21 The fourth embodiment of the shaft locking mechanism is different from the first embodiment in that

[0082] Referring to Figure 15 The electric power tool is taken as a table saw 400. The table saw 400 comprises a workbench 40, a motor 41 and an output shaft 42. The output shaft 42 is used to connect a rotating cutting element, which is a saw blade 44 in this embodiment. The motor 41 drives the output shaft 42 to rotate. In this embodiment, the output shaft 42 rotates about a second axis 402, and the motor shaft of the motor 41 rotates about a first axis. The positional relationship and transmission structure of the first axis and the second axis do not affect the essential content of the present application. In this embodiment, the first axis and the second axis 402 are not coincident.

[0083] The shaft locking mechanism 45 is used to lock the rotation of the output shaft 42 about the second axis 102.

[0084] The shaft locking mechanism 45 comprises a shaft locking assembly 45a, an operating part 45b and a locking assembly 45c. The shaft locking assembly 45a comprises a first shaft locking member 452 and a second shaft locking member 451. The second shaft locking member 451 is a shaft locking plate. For the convenience of reference, the shaft locking plate 451 is used instead of the second shaft locking member 451, but it cannot be regarded as a limitation to the present application. The shaft locking plate 451 rotates about a fifth axis 405 which is parallel to the second axis 402. The first shaft locking member 452 is a ring. For the convenience of reference, the ring 452 is used instead of the first shaft locking member 452, but it cannot be regarded as a limitation to the present application. The ring 452 is connected to or formed on the outside of the output shaft 42. In the present embodiment, the ring 452 is composed of an inner flange. The ring 452 is provided with a non-circular locking portion 452a. The shaft locking plate 451 comprises an execution portion 4511 and a release portion 4512. The execution portion 4511 is configured to selectively engage the locking portion 452a. When the execution portion 4511 at least partially engages the locking portion 452a, the output shaft 42 cannot rotate, and the shaft locking assembly 45a is in a first state. The release portion 4512 is configured on the side of the execution portion 4511 in the direction of movement of the shaft locking plate 451 and communicates with the execution portion 4511. When the release portion 4512 engages the locking portion 452a, the output shaft 42 is allowed to rotate, and the shaft locking assembly 45a is in a second state.

[0085] In the present embodiment, the shaft locking assembly 45a further comprises a guide portion 45d. The guide portion 45d drives at least one of the locking portion 452a and the execution portion 4511 to relatively rotate the locking portion 452a and the execution portion 4511 so that the execution portion 4511 engages the locking portion 452a, and the shaft locking assembly 45a is in the first state. The guide portion 45d comprises a first rotating portion 455 and a first pushing member 465. The first rotating portion 455 is connected to or formed on the first shaft locking member, i.e. the first rotating portion 455 is located on the ring 452 of the output shaft. The first pushing member 465 is arranged between the release portion 4512 and the execution portion 4511. The first pushing member 465 drives the first rotating portion 455 to rotate so that the execution portion 4511 engages the locking portion 452a. In the present embodiment, the first pushing member 465 is arranged on the second shaft locking member. The first pushing member is at least partially arranged on the part where the release portion 4512 and the execution portion 4511 communicate. The first pushing member drives the first rotating portion to move synchronously.

[0086] In the present embodiment, the outer periphery of the ring 452 of the output shaft is formed with a tooth structure to constitute the first rotating portion 455, and the plane of the part of the execution portion 4511 is not provided with a tooth structure. The first pushing member 465 is provided with a tooth structure which engages the tooth structure of the first rotating portion 455.

[0087] In the embodiment, the shaft locking plate 451 is rotatable along a fifth axis 405 parallel to the second axis 402, and the shaft locking plate 451 is provided with a front end and a rear end along a circumferential direction of the fifth axis 405, wherein the execution part 4511 is arranged at a position close to the front end, and the release part 4512 is arranged at a position close to the rear end. The shaft locking plate 451 is sleeved on the ring sleeve 452.

[0088] The operation part 45b is arranged outside the workbench 40, and the operation part 45b is arranged at one end of the shaft locking plate 451, so that a user can switch the shaft locking assembly 45a between the first state and the second state by rotating the operation part 45b.

[0089] When the shaft locking assembly 45a is in the second state, the release part 4512 of the shaft locking plate 451 is sleeved on the ring sleeve 452, the user rotates the operation part 45b, and the shaft locking plate 451 rotates about the fifth axis 405, at this time, the first pushing part 465 is engaged with the first rotating part 455, and the first pushing part 465 drives the first rotating part 455 to rotate about the second axis 402. When the shaft locking assembly 45a is in the first state, the first pushing part 465 is disengaged from the first rotating part 455, the execution part 4511 of the shaft locking plate 451 is sleeved on the locking part 452a, and the rotation of the output shaft 42 is locked, the locking assembly 45c locks the shaft locking plate 451, and further locks the shaft locking assembly 45a in the first state.

[0090] The locking assembly 45c includes a limiting part 454 and a receiving part 456, wherein the limiting part 454 is arranged outside the motor shaft, specifically on the accommodating part 431 or other components that do not move with the shaft locking mechanism. The limiting part 454 is at least one. The receiving part 456 is arranged on the shaft locking plate 451. The receiving part 456 and the limiting part 454 are configured such that when the shaft locking assembly 45a is in the first state, the limiting part 454 is at least partially embedded or connected in the receiving part 456, the movement of the shaft locking plate 451 along the fifth axis 405 is limited, and the shaft locking assembly 45a is locked in the first state. When the user triggers the operation part 45b again to switch the shaft locking assembly 45a to the second state, the limiting part 454 is disengaged from the receiving part 456, the shaft locking plate 451 is allowed to move along the third axis 403, and the shaft locking assembly 45a is allowed to switch from the first state to the second state.

[0091] The limiting part 454 is a limiting rod, and the receiving part 456 is a limiting hole matched in diameter with the limiting rod.

[0092] The limiting part 454 further comprises an elastic element 458 arranged on the limiting rod and a guide surface 457 of at least one of the limiting part 454 and the receiving part 465. The guide surface 457 is arranged on the limiting rod and is a contact surface of the limiting rod and the limiting hole. Preferably, the guide surface 457 is a circular arc surface. When the limiting rod is not in the limiting hole, the elastic element 458 is compressed to store energy. When the circular arc surface of the limiting rod is aligned with the limiting hole, the elastic element 458 rebounds, so that the limiting rod automatically enters the limiting hole.

[0093] When the shaft locking assembly 45a is in the first state, the electric power tool cannot be used. Taking a bench saw as an example, when the operating assembly is in the first position, the workbench block cannot be installed, and the bench saw cannot be started.

[0094] Referring to Figures 22-25 The fifth embodiment of the shaft locking mechanism is different from the first embodiment of the shaft locking mechanism in that the shaft locking assembly is different.

[0095] In this embodiment, the electric power tool is taken as a miter saw 500 as an example.

[0096] The second shaft locking part comprises a shaft locking plate 551 connected or formed on the output shaft 52 or the motor shaft 511. In other alternative embodiments, the shaft locking plate 551 can be connected or formed on the second gear 543 or the first gear 442. The motor shaft 511 rotates about the first axis 501, and the output shaft 52 rotates about the second axis 502. In this embodiment, the first axis 501 and the second axis 502 are arranged in parallel.

[0097] In this embodiment, the first shaft locking part is a ring sleeve 552 formed or connected outside the motor shaft 511 of the motor 51, and the ring sleeve is provided with a non-circular locking part 552a

[0098] The shaft locking plate 551 comprises an execution part 5511 and a release part 5512. The execution part 5511 is configured to selectively engage the locking part 552a. When the execution part 5511 and the locking part 552a are at least partially engaged, the motor shaft 511 cannot rotate. The release part 5512 is configured on one side of the execution part 5511 in the movement direction of the shaft locking part 551 and communicates with the execution part 5511. When the release part 5512 engages the locking part 552a, the motor shaft 511 is allowed to rotate.

[0099] In the present embodiment, the shaft locking plate 551 is movable along a third axis 503 which is perpendicular to the first axis 501 of the motor shaft 511, the shaft locking plate 551 is provided with a front end and a rear end along the direction of the third axis 503, wherein the execution part 5511 is arranged at a position close to the front end, and the release part 5512 is arranged at a position close to the rear end. The execution part 5511 is sleeved on the ring sleeve 552, and when the shaft locking assembly is in the first state, the execution part 5511 is embedded or closely surrounded on the locking part 552a to lock the rotation of the motor shaft 511. The release part 5512 is sleeved on the ring sleeve 552, and the release part 5512 is substantially not in contact or completely not in contact with the locking part 552a, and the motor shaft 511 is allowed to rotate in the release part 5512.

[0100] The operation assembly 55c includes an operation part 553 arranged outside the shell 53, and the operation part 553 is arranged at one end of the shaft locking plate 551 to allow a user to switch the shaft locking assembly between the first state and the second state by pushing and pulling the operation part 553. In the present embodiment, the operation part 553 is arranged at the front end, and the user pushes the operation part 553 into the shell 53 to make the execution part 5511 of the shaft locking plate 551 engage the locking part 552a, and pulls the operation part 553 out of the shell 53 to switch the shaft locking assembly from the first state to the second state. In other alternative embodiments, the operation part 553 can be arranged at the rear end, and the user can switch the first state and the second state in the opposite way as in the present embodiment.

[0101] The locking assembly includes a limiting part 555 and a receiving part 556, wherein the limiting part 555 is arranged outside the motor shaft, specifically on the accommodating part or other components that do not move with the shaft locking mechanism. The limiting part 555 is at least one. The receiving part 556 is arranged on the shaft locking plate 551. The receiving part 556 and the limiting part 555 are configured such that when the shaft locking assembly is in the first state, the limiting part 555 is at least partially embedded or connected in the receiving part 556, the movement of the shaft locking plate 551 along the third axis 503 is limited, and the shaft locking assembly is locked in the first state. When the user triggers the operation assembly again to switch the shaft locking assembly to the second state, the limiting part 555 is disengaged from the receiving part 556, the shaft locking plate is allowed to move along the third axis 503, and the shaft locking assembly is allowed to switch from the first state to the second state.

[0102] The shaft locking assembly 55a further includes a guide part comprising a plurality of permanent magnets 559 installed along the third axis 503, a part of the permanent magnets 559 being arranged close to the front end of the shaft locking plate 551, and a part of the permanent magnets 559 being arranged close to the rear end of the shaft locking plate 551. A metal plate on the shaft locking plate which is attracted to the permanent magnets is formed or connected to the shaft locking plate 551. Both of them provide magnetic attraction force to automatically align and position the second shaft locking part and the execution part.

[0103] Alternatively, the limiting part of the locking assembly in the embodiment can also be replaced by a permanent magnet, and the receiving part in the embodiment can be replaced by a metal plate on the shaft lock plate that is attracted to the permanent magnet.

[0104] As an alternative embodiment, the shaft lock plate moves in a direction perpendicular to the first axis, the shaft lock plate is provided with a first slot and a second slot in a direction perpendicular to the first axis, wherein the first slot is used to engage with the non-circular structure of the rotatable power output shaft, and the second slot is used to install a fastener. The first slot is provided with a locking part and an unlocking part, and the shaft lock plate is driven to move in a direction perpendicular to the first axis by operating the operating assembly, so as to selectively engage the locking part or the unlocking part with the non-circular structure of the rotatable power output shaft, so as to achieve the purpose of locking or unlocking the rotatable power output shaft. The second slot is connected to the fastener, and when the locking part engages with the non-circular structure of the rotatable power output shaft, the fastener locks the movement of the shaft lock plate. Preferably, the fastener automatically locks the shaft lock plate, and when the user operates again, the fastener releases the shaft lock plate. In other embodiments, the fastener can lock or release the shaft lock plate in a manual manner.

[0105] Referring to Figures 26-30 The sixth embodiment of the shaft lock mechanism is different from the fourth embodiment of the shaft lock mechanism in the locking assembly and the guide assembly.

[0106] In the embodiment, the ring sleeve 652 is formed on or connected to the output shaft 62. The output shaft 62 rotates about the second axis 602. The third axis 603 is perpendicular to the second axis 602.

[0107] In the embodiment, the limiting part 655 of the locking assembly 65c is a swing rod. The receiving part 656 includes a curved slot formed on the shaft lock plate 651. In the embodiment, the limiting part 655 is a swing rod, and the receiving part 656 is a curved slot. In the subsequent description, the swing rod 655 will be used instead of the limiting part 655, and the curved slot 656 will be used instead of the receiving part 656. However, this does not limit the present application.

[0108] The curved slot 656 includes a first recess 6561 and a second recess 6562, and each of the first recess 6561 and the second recess 6562 can receive one end of the swing rod 655. The first recess 6561 is close to the releasing part 6512, and the second recess 6562 is close to the executing part 6511. When the shaft lock assembly is in the first state, one end of the swing rod 655 is embedded in the second recess 6562, the movement of the shaft lock plate 651 in the direction of the third axis 603 is limited, and the shaft lock assembly 65a is locked in the first state. When the user triggers the operating part 653 again to switch the shaft lock assembly 65a to the second state, one end of the swing rod 655 slides from the second recess 6562 to the first recess 6561, and the shaft lock assembly 65a is in the second state.

[0109] The shaft lock assembly 65a further comprises a guide surface 658 and a resilient element 659 arranged in the receiving portion 665. The guide surface 658 comprises a first sliding section 6581 connecting the first recess 6661 and the second recess 6662 and urging the end of the swing lever 655 out of the first recess 6661, a first driving section 6582 connecting the first sliding section 6581 and urging the end of the swing lever 655 into the second recess 6662, a second sliding section 6583 connecting the second recess 6662 and urging the end of the swing lever 655 out of the second recess 6662, and a second driving section 6584 connecting the second sliding section 6583 and urging the end of the swing lever 655 into the first recess 6661. The second sliding section 6583 is connected to the second driving section 6584 at a position in front of the second recess 6662. The resilient element 659 is connected between the shaft lock plate 651 and the rear end in the direction of the third axis 603, i.e. the end of the shaft lock plate 651 closest to the release portion. Preferably, the resilient element 659 is a tension spring.

[0110] When the shaft locking assembly 65a is in the second state, the release part 6512 of the shaft locking plate 651 is sleeved on the ring sleeve 652, and the end of the swing lever 655 is embedded in the first groove 6661. The user presses the operation assembly to move the operation part 653 along the third axis 603 in the direction of the rear end of the shaft locking plate, and the elastic element 659 starts to be charged. The end of the swing lever 655 moves along the first sliding section 6581 to the first driving section 6582, and after entering the first driving section 6582, the user presses the operation assembly shaft locking plate 651 to make the end of the swing lever 655 abut against the first driving section 6582, so that the shaft locking plate 651 cannot move in the direction of the rear end any more. The user releases the operation assembly, and the elastic element 659 rebounds to push the shaft locking plate 651 in the direction of the front end of the shaft locking plate 651 along the third axis 603. The first driving section 6582 guides the end of the swing lever 655 into the second groove 6662, and at this time the shaft locking assembly 65a is in the first state, and the execution part 6511 of the shaft locking plate 651 is sleeved on the locking part 652a. The movement of the shaft locking plate 651 caused by the tension of the elastic element 659 in the direction of the front end of the shaft locking plate along the third axis 603 is locked by the second groove 6662, and the first state of the shaft locking assembly 65a is locked. The user presses the operation assembly again to move the operation assembly in the direction of the rear end of the shaft locking plate along the third axis 603, and the elastic element 659 starts to be stretched continuously. The end of the swing lever 655 moves along the second sliding section 6583 away from the second groove 6662. When the end of the swing lever 655 is at the connection between the second sliding section 6583 and the second driving section 6584, the end of the swing lever 655 abuts against the connection between the second sliding section 6583 and the second driving section 6584, so that the shaft locking plate 651 cannot move in the direction of the rear end. The user releases the operation assembly, and the elastic element 659 rebounds to push the shaft locking plate 651 in the direction of the front end of the shaft locking plate along the third axis 603. The second driving section 6584 guides the end of the swing lever 655 into the first groove 6661, and the release part 6512 is sleeved on the ring sleeve 652. At this time, the shaft locking assembly 65a is in the second state.

[0111] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of the present application.

Claims

1. A power tool, comprising: a motor including a drive shaft rotating about a first axis; an output shaft for connecting a working accessory; the output shaft is driven by the motor to rotate about a second axis; characterized in that further comprising: a shaft lock mechanism, comprising: a shaft lock assembly including a first state restricting rotation of the output shaft and a second state releasing rotation of the output shaft; the shaft lock assembly includes a first shaft lock member and a second shaft lock member moving relative to the first shaft lock member; wherein the second shaft lock member is engaged with the first shaft lock member when the second shaft lock member is in a first position; the second shaft lock member is disengaged from the first shaft lock member when the second shaft lock member is in a second position; an operating assembly for switching the state of the shaft lock assembly; a locking assembly configured to be driven to cause the second shaft lock member to be in the first position and restrict the second shaft lock member from moving to the second position, and when driven again, allow the second shaft lock member to be displaced from the first position to the second position; the locking assembly includes a locking boss connected to the operating assembly and the second shaft lock member, and a receiving portion formed or connected with a first groove and a second groove formed in a direction along a third axis perpendicular to the second axis, the first groove has a smaller extension depth than the second groove; the locking boss is at least partially embedded in the first groove when the shaft lock assembly is in the first state, and the locking boss is at least partially embedded in the second groove when the shaft lock assembly is in the second state.

2. The power tool according to claim 1, characterized in that: the first shaft lock member is provided with a locking portion, the second shaft lock member is selectively engaged or disengaged from the locking portion, the shaft lock assembly further comprises: a first biasing element providing a biasing force to move the first shaft lock member towards the direction of engaging the locking portion when the first shaft lock member is engaged with the second shaft lock member, the shaft lock assembly is in the first state when the second shaft lock member is engaged with the locking portion, and the shaft lock assembly is in the second state when the second shaft lock member is disengaged from the locking portion.

3. The power tool of claim 2, wherein, the second shaft lock member moves relative to the first shaft lock member in a direction along a third axis perpendicular to the second axis.

4. The power tool of claim 1, wherein, the operating assembly reciprocates in a direction along the third axis perpendicular to the second axis.

5. The power tool of claim 1, wherein, the locking assembly further comprises a second biasing element generating a biasing force for the locking boss to move in a direction towards being embedded in the first groove or the second groove.

6. The power tool of claim 1, wherein, the operating assembly drives the locking boss to move between the first groove and the second groove.

7. The power tool of claim 2, wherein, the first shaft lock member includes a shaft lock disc formed on or connected to the output shaft, and the locking portion is discretely provided along an outer periphery of the shaft lock disc.

8. The power tool of claim 2, wherein, the second shaft lock member includes a shaft lock rod connected to the locking assembly.

9. The power tool of claim 1, wherein, the driving force of the operating assembly is transmitted to the second shaft lock member through the locking assembly.

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