Power tool

Abstract

The application discloses an electric tool, comprising: a shaft locking mechanism, comprising: a shaft locking 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 locking assembly comprises: a locking part, formed or connected to a driving shaft or an output shaft; an execution part, selectively engaging the locking part, a guide part, the guide part driving at least one of the locking part and the execution part, so that the locking part and the execution part relatively rotate to make the execution part engage the locking part, and the shaft locking assembly is in the first state. The electric tool is convenient to operate and has high safety.

Description

Technical Field

[0001] This application relates to the field of power tools. Background Technology

[0002] Existing rotary power tools, such as table saws, circular saws, miter saws, wood milling machines, and edge trimmers, require one hand to continuously press the shaft lock button while the other hand changes the saw blade when changing working elements such as saw blades or grinding discs. This operation is inconvenient, time-consuming, and labor-intensive. When the shaft lock mechanism needs to be activated, the components that lock the output shaft may not be aligned. The user must manually adjust them to a specified position to align them before the operating component can be triggered or the components can be connected to lock the rotation of the output shaft. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this application is to provide a cutting tool that does not require continuous pressing or manual alignment.

[0004] To achieve the objective, this application adopts the following technical solution:

[0005] An electric tool includes: a motor including a drive shaft that rotates about a first axis; an output shaft for connecting a working attachment; the output shaft being driven by the motor to rotate about a second axis; and further includes: a shaft locking mechanism including: a shaft locking assembly including a first state restricting rotation of the output shaft and a second state releasing rotation of the output shaft; the shaft locking assembly including: a locking portion formed or connected to the drive shaft or the output shaft; an actuating portion selectively engaging the locking portion; a guide, the guide driving at least one of the locking portion and the actuating portion to cause the locking portion and the actuating portion to rotate relative to each other to engage the locking portion with the locking portion, wherein the shaft locking assembly is in the first state.

[0006] In some embodiments, the guide includes a first rotating portion and a first pushing portion, wherein the first rotating portion is connected to or formed on the locking portion, and the first pushing portion is connected to or formed on the actuating portion; the first pushing portion drives the first rotating portion to rotate so that the actuating portion engages the locking portion.

[0007] In some embodiments, the shaft locking assembly further includes a release portion, wherein when the shaft locking assembly is in a second state, the locking portion engages with the release portion.

[0008] In some embodiments, the shaft lock assembly includes: a first shaft lock member, a locking portion disposed on the first shaft lock member, the first shaft lock member being formed or connected to a drive shaft or an output shaft; and a second shaft lock member, an actuator disposed on the second shaft lock member, the second shaft lock member being sleeved on the first shaft lock member and reciprocating relative to the first shaft lock member.

[0009] In some embodiments, the release part is disposed on the second shaft locking member, and the release part and the execution part are respectively disposed on both sides of the first push part.

[0010] In some embodiments, the first rotating part is disposed on the first shaft locking member, and the first pushing part is disposed on the second shaft locking member.

[0011] In some embodiments, the first pushing part drives the first rotating part to move synchronously.

[0012] In some embodiments, the first rotating part and the first pushing part are respectively provided with meshing teeth.

[0013] In some embodiments, the shaft locking mechanism further includes an operating part for driving a guide to drive at least one of a locking part and an actuating part.

[0014] In some embodiments, the shaft locking mechanism further includes a locking component configured to restrict the relative movement between the actuator and the locking component when the shaft locking component is in a first state.

[0015] When changing the saw blade, this power tool uses a guide to drive the locking part and the actuator to move relative to each other, aligning the locking part and the actuator. The shaft locking mechanism locks the power tool shaft, eliminating the need for the user to rotate the output shaft and avoiding danger. Attached Figure Description

[0016] Figure 1 This is a partial cross-sectional view of the power tool according to the first embodiment;

[0017] Figure 2 This is a schematic diagram of the shaft locking mechanism and output shaft of the first embodiment;

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

[0019] Figure 4 yes Figure 3 A sectional view;

[0020] Figure 5 yes Figure 3 Exploded view;

[0021] Figure 6 yes Figure 5 A sectional view;

[0022] Figure 7 This is a schematic diagram of the shaft locking mechanism and output shaft of the second embodiment, with the shaft locking assembly in the first state;

[0023] Figure 8 yes Figure 7 A sectional view;

[0024] Figure 9 This is a schematic diagram of the shaft locking mechanism and output shaft of the second embodiment, with the shaft locking assembly in the second state;

[0025] Figure 10 yes Figure 9 A sectional view;

[0026] Figure 11 This is a schematic diagram of the shaft locking mechanism and output shaft of the third embodiment, with the shaft locking assembly in the first state;

[0027] Figure 12 yes Figure 11 A sectional view;

[0028] Figure 13 yes Figure 11 Exploded view;

[0029] Figure 14 yes Figure 11 A sectional view;

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

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

[0032] Figure 17 yes Figure 16 A schematic diagram of another view;

[0033] Figure 18 yes Figure 16 A schematic diagram of the central axis lock assembly in its second state;

[0034] Figure 19 yes Figure 18 A schematic diagram of another view;

[0035] Figure 20 This is a schematic diagram of the perspective view of the limiting part in the fourth embodiment;

[0036] Figure 21 This is a schematic diagram of the first shaft locking component in the fourth embodiment;

[0037] Figure 22 This is a schematic diagram of a perspective view of the power tool according to the fifth embodiment after part of the housing has been removed;

[0038] Figure 23 This is a schematic diagram of the first shaft locking component in the fifth embodiment;

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

[0040] Figure 25 This is a perspective view of another alternative solution in the fifth embodiment;

[0041] Figure 26 This is a schematic diagram of a perspective view of the drive mechanism, output shaft, and shaft locking mechanism of the sixth embodiment;

[0042] Figure 27 yes Figure 26 Exploded view;

[0043] Figure 28 This is a partially enlarged schematic diagram of the curved groove on the shaft locking plate in the sixth embodiment;

[0044] Figure 29 This is a schematic diagram showing the positional relationship between the limiting part, receiving part, and guide member of the shaft lock assembly in the second state according to the specific implementation of the sixth embodiment;

[0045] Figure 30 This is a schematic diagram showing the positional relationship of the limiting part, receiving part, and guide member of the shaft lock assembly in the first state according to the sixth embodiment. Detailed Implementation

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

[0047] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] Reference Figure 1 As shown, the power tool of the first embodiment of this application is an electric circular saw.

[0050] Reference Figure 1-6As shown, the circular saw 100 includes a motor 11, an output shaft 12, a housing 13, and a shaft locking mechanism 15. The output shaft 12 is used to connect a rotary cutting element, which in this embodiment is a saw blade 16. The housing 13 includes a receiving portion 131, within which the motor 11 is placed. The output shaft 12 is at least partially disposed within the receiving portion 131. It should be noted that the motor 11 in this invention is specifically configured as an electric motor 11, which will be used hereinafter to refer to the motor 11, but this should not be construed as a limitation of the invention. The electric motor 11 includes a drive shaft 111, which rotates about a first axis 101. This drive shaft 111 will be used hereinafter to refer to the motor shaft 111, but this should not be construed as a limitation of the invention.

[0051] A first gear (not shown) is connected to the motor shaft 111. In other embodiments, the first gear may be formed on the motor shaft 111, forming an integral structure with the motor shaft 111. A second gear 143 is connected to the output shaft 12, and the second gear 143 meshes with the first gear. The motor shaft 111 drives the first gear to rotate, and the first gear drives the second gear 143 and the output shaft 12 to form a whole that rotates about the second axis 102. In this embodiment, the second axis 102 intersects the first axis 101. In other alternative embodiments, the second axis 102 is perpendicular or parallel to the first axis 101.

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

[0053] The shaft locking mechanism 15 includes a shaft locking assembly 15a, an operating assembly 15b, and a locking assembly 15c. The shaft locking assembly 15a has a first state that locks the rotation of the output shaft 12 about the second axis 102, and a second state that allows the output shaft 12 to rotate about the second axis 102. In the first state, the rotation of the output shaft 12 is locked; that is, the output shaft 12 is locked directly or by locking the rotation of the second gear 143. In the second state, the rotation of the output shaft 12 is released; that is, the second gear 143 and the output shaft 12 as a whole can be driven by the first gear to rotate about the second axis 102.

[0054] The shaft locking assembly 15a includes 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 movable relative to the first shaft locking member 152. The second shaft locking member 151 has a first position and a second position. In the first position, the second shaft locking member 151 is engaged with the first shaft locking member 152. At this time, the shaft locking assembly 15a may be in either the first or second state. When the second shaft locking member 151 is in the second position, it is disengaged from the first shaft locking member 152, and the shaft locking assembly 15a is in the second state. In this embodiment, the first shaft locking member 152 is provided with a locking portion 152a. The second shaft locking member 151 can selectively connect to or disengage 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 disengages from the locking portion 152a, the shaft locking assembly 15a is in a second state. When the second shaft locking member 151 is in the first position, the second shaft locking member 151 is in contact with the non-locking portion, and the first biasing element 157 provides a biasing force to move the second shaft locking member 151 toward engaging the locking portion 152a. In this embodiment, the first biasing element 157 is a first compression spring.

[0055] The operating component 15b is at least partially disposed outside the housing 13 for user operation to switch the state of the shaft locking mechanism. Each time the operating component 15b is triggered, the second shaft locking member 151 switches between a first position and a second position. That is, if the second shaft locking member 151 is in the second position, triggering the operating component 15b once moves the second shaft locking member 151 from the second position to the first position. Triggering the operating component again moves the second shaft locking member 151 from the first position back to the first position.

[0056] The locking component 15c is driven by the operating component 15b, which in turn drives the second axis lock 151. When the second axis lock 151 is in the first position, the locking component 15c prevents the second axis lock 151 from moving to the second position. Furthermore, when the operating component 15b is triggered again, thereby driving the locking component 15c again, the second axis lock 151 is allowed to move from the first position to the second position. When the user changes the saw blade, the rotation of the output shaft can be locked without constantly operating the operating component of the axis lock mechanism with one hand. When the user operates it again, the locking component releases the axis lock component, switching it to the second state for normal machine use. By using the locking component to restrict the position of the second axis lock, compared to locking the second axis lock by restricting the operating component, the locking mechanism of this application is more stable and reduces the possibility of accidental activation of the operating component placed outside the machine, causing a change in the locking state.

[0057] Specifically, when the saw blade needs to be replaced and the shaft locking mechanism is activated, the second shaft locking member 151 is in the second position. When the operating component 15b is triggered, the second shaft locking member 151 moves from the second position to the first position. At this time, regardless of whether the second shaft locking member 151 is engaged with the locking part 152a, the locking component 15c restricts the movement of the second shaft locking member 151 back to the second position. If the second shaft locking member 151 is engaged with the locking part 152a, the shaft locking assembly 15a is in the first state. If the second shaft locking member 151 is engaged with the part not engaged with the locking part 152a, the first biasing element 157 is compressed and in an energy storage state. When the saw blade is replaced, the output shaft is rotated by external force. When the second shaft locking member 151 is aligned with the locking part 152a, the energy released by the first biasing element 157 drives the second shaft locking member 151 to engage with the locking part 152a. At this time, the shaft locking assembly 15a is in the first state. When the operating component 15b is triggered again, the locking component 15c allows the second shaft locking member 151 to move from the first position to the second position, that is, the second shaft locking member 151 disengages from the locking part 152a. At this time, the shaft locking component 15a is in the second state, and the rotation of the output shaft 12 is released. In this shaft locking mechanism, when disassembling the saw blade 16, the locking component 15c maintains the position of the second shaft locking member 151, achieving the locking of the output shaft 12 without requiring continuous manual triggering of the operating component 15b. Furthermore, regardless of the relative positions of the locking part 152a and the second shaft locking member 151, both the operating component 15b and the locking component 15c can be triggered without adjusting the second shaft locking member 151 and the locking part 152a. With this shaft locking mechanism, the user only needs to trigger the operating component 15b once, facilitating user operation and ensuring user safety.

[0058] In this embodiment, the first shaft locking member 152 is a shaft locking disc, which is connected to the output shaft 12. The shaft locking disc and the output shaft 12 form a whole and rotate about the second axis 102. For ease of reference, the shaft locking disc 152 is used instead of the first shaft locking member 152, but it should not be construed as a limitation of this application.

[0059] Multiple slots are provided on the outer circumferential surface of the shaft locking disc 152, with the slots spaced at equal intervals or angles. In this embodiment, four slots are provided circumferentially, all extending radially towards the center of the shaft locking disc 152, with their openings facing the outer side of the shaft locking disc 152. The four slots are spaced 90° apart. A guide surface 1522 is provided between two adjacent slots. In this embodiment, the guide surface 1522 is an arc surface, with the slots on both sides of the arc surface located at the lowest point of the arc surface.

[0060] The second shaft locking element 151 is a shaft locking rod. For ease of reference, shaft locking rod 151 is used instead of second shaft locking element 151, but this should not be construed as a limitation of this application. The shaft locking rod 151 is driven by locking assembly 15c. In this embodiment, the shaft locking rod 151 moves along the direction of the third axis 103. In this embodiment, the third axis 103 is perpendicular to the second axis 102. The direction of movement of the shaft locking rod 151 is adapted to the opening direction of the slot of the shaft locking disc 152, so in other alternative embodiments, the shaft locking rod 151 may rotate in a direction parallel to the second axis or about the second axis, which is not limited here.

[0061] The operating component 15b includes a pressing member 153. The pressing member 153 extends outside the housing 13, and the user directly presses on the pressing member 153 to switch the shaft locking lever 151 to either the first or second position. The movement direction of the pressing member 153 is the same as that of the shaft locking lever 151, both reciprocating along the third axis 103.

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

[0063] In this embodiment, when the shaft locking rod 151 is in the second position, the pressing member 153 is moved into the housing along the third axis 103. The pressing member 153 drives the shaft locking rod 151 to move along the third axis 103 close to the shaft locking disc 152 from the second position to the first position. When the shaft locking rod 151 is in the first position, depending on the random stop position of the output shaft 12, the shaft locking rod 151 may abut against the guide surface 1522 or be partially embedded in the slot. At this time, regardless of whether the shaft locking rod 151 is partially embedded in the slot, the locking component 15c restricts the movement of the shaft locking rod 151 away from the shaft locking disc 152 along the third axis 103. If the shaft locking rod 151 is directly aligned with the slot below along the direction of the third axis 103, the shaft locking rod 151 extends directly into the slot, and the shaft locking assembly 15a is in the first state. If the shaft locking rod 151 is located between adjacent slots, i.e., the shaft locking rod 151 abuts against the guide surface 1522, the first biasing element 157 is compressed and in an energy storage state. The shaft locking rod 151 remains under the pressure of the first biasing element 157 at this time. When changing the saw blade, the output shaft 12 is rotated by an external force, and the shaft locking rod 151 slides along the guide surface 1522, aligning with the adjacent slot. At this time, the energy released by the first biasing element 157 drives the shaft locking rod 151 to partially embed into the slot, and the shaft locking assembly 15a is in the first state. When the pressing element 153 is triggered again, the locking component 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 component 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 a portion of the outer side of the locking boss 156. In this embodiment, the receiving portion 155 is a cylindrical housing with an internal receiving cavity, in which the pressing member 153 is partially disposed. The locking boss 156 includes a first end 1561 and a second end 1562. The first end 1561 is connected to the pressing member 153, and the second end 1562 is connected to the locking rod 151. The locking boss 156 has a receiving cavity at the second end 1562, in which the locking rod 151 extends and slides. Multiple boss portions 1563 are provided on the outer periphery of the locking boss 156, and the boss portions 1563 are evenly arranged circumferentially on the outer periphery of the locking boss 156. One end of the boss portion 1563 extends along the third axis 103 to the second end 1562, and the other end of the boss portion 1563 extends along the third axis 103 to connect with the pressing member 153.

[0065] A first groove 1551 and a second groove 1552 extend along the third axis 103 on the inner sidewall of the receiving part 155. Multiple first grooves 1551 and second grooves 1552 are provided, with one second groove 1552 between every two first grooves 1551. The spacing between every two first grooves 1551 is the same as the spacing between every two bosses 1563, and the spacing between every two second grooves 1551 is the same as the spacing between every two bosses 1563. The width of the first grooves 1551 and second grooves 1552 is adapted to the bosses 1563, allowing the bosses 1563 to be at least partially embedded in the first grooves 1551 and second grooves 1552. The openings of both the first grooves 1551 and second grooves 1552 face the second end 1562 of the locking boss 156. Both the first grooves 1551 and second grooves 1552 extend along the third axis 103 toward 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, when the boss 1563 stops moving along the third axis 103 within the first groove 1551, the distance from its second end 1562 to the output shaft 12 is smaller than when the boss 1563 stops moving along the third axis 103 within the second groove 1552. Therefore, when the operating component 15b is in the first position, and the boss 1563 partially engages with the first groove 1551 and stops moving along the third axis 103, the shaft locking rod 151 engages with the slot. When the operating component 15b is in the second position, and the boss 1563 partially engages with the second groove 1552 and stops moving along the third axis 103, the shaft locking rod 151 disengages from the slot.

[0066] Each first groove 1551 and each second groove 1552 has a first guide surface 1553 between their openings, and each boss portion 1563 has a second guide surface 1564 that mates with the first guide surface 1553. The first guide surface 1553 and the second guide surface 1564 contact each other, driving the locking boss 156 to rotate about the third axis 103. The pressing member 153 has a third guide surface 1531 at its connection with the boss portion 1563. The third guide surface 1531 contacts the second guide surface 1564, driving the locking boss 156 to rotate about the third axis 103 in the same direction 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 on the locking boss 156, driving the boss portion 1563 toward the recess 1551 or the second recess 1552. In this embodiment, the second biasing element and the reset elastic member 154 are the same component. In other alternative embodiments, the biasing element can be a separate component; preferably, the second biasing element is a compression spring. In this embodiment, the second end 1562 of the locking boss 156 is connected to the reset elastic member 154.

[0068] Taking the transition of the shaft lock assembly 15a from the second state to the first state as an example, the pressing member 153 moves into the housing 13, driving the locking boss 156 to move into the housing along the third axis 103. That is, the second end 1562 of the locking cam moves towards the output shaft 12. The boss 1563 moves towards the opening of the second groove 1552. When the boss 1563 disengages from the second groove 1552, the third guide surface 1531 on the pressing member 153 drives the second guide surface 1564 of the locking boss 156, causing the locking boss 156 to rotate about the third axis 103, aligning the second guide surface 1564 with the first guide surface 1553. When the pressing element 153 no longer provides the driving force for movement into the housing 13, the second biasing element provides the locking boss 156 with the driving force to move outward from the housing 13. When the second guide surface 1564 contacts the first guide surface 1553, the first guide surface 1553 drives the locking boss 156 to continue rotating about the third axis 103, causing the boss portion 1563 to be embedded in the first groove 1551 and stop moving along the third axis 103. At this time, the shaft locking rod 151 is embedded in the slot, and the shaft locking assembly 15a is in the first state. Since the biasing element continuously provides the driving force of the boss portion 1563 towards the first groove 1551, the boss portion 1563 remains embedded in the first groove 1551 and stops moving along the third axis 103 when there is no need to continuously apply pressing force to the pressing element 153. The position of the shaft locking rod 151 remains unchanged, and the first state of the shaft locking assembly 15a is locked. When the shaft lock assembly 15a switches from the first state to the second state, the user moves into the housing 13 again by pressing the member 153. The movement process of the locking cam is different from that of the user. The boss 1563 is inserted into the second groove 1552, so that the shaft lock rod 151 is disengaged from the slot.

[0069] Reference Figure 7-10 As shown, in the second embodiment of the shaft locking mechanism of this solution, the difference lies only in the operating component and the locking component.

[0070] In the shaft locking mechanism 25, the operating component 25b includes a pusher 253, partially located outside the housing's receiving portion, for the user to push, causing the pusher 253 to reciprocate along the fourth axis 204 on the housing. In this embodiment, the fourth axis 204 is spatially perpendicular to the second axis 102. The portion of the pusher 253 facing the housing is provided with a first stepped surface 2531 and a second stepped surface 2532 extending along the third axis 203 toward the output shaft 22. Both the first stepped surface 2531 and the second stepped surface 2532 are planes parallel to the fourth axis 204. A height difference exists between the first stepped surface 2531 and the second stepped surface 2532, with the first stepped surface 2531 being closer to the output shaft 22 than the second stepped surface 2532.

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

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

[0073] The second biasing element 254 is connected at one end to the first locking member 256 and at the other end to the receiving part or other parts 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 drive the first locking member 256 toward the pushing member. Preferably, the second biasing element 254 is a compression spring.

[0074] In this embodiment, when the second step surface 2532 contacts the third step surface 2563, the first locking member 256 is furthest from the output shaft 22, the shaft locking rod 251 disengages from the slot 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 an interlocking structure to ensure stable contact between the second step surface and the third step surface, requiring an external force exceeding a preset force for relative movement to occur. When the shaft locking assembly needs to switch from the second state to the first state, the pusher 253 is pushed along the fourth axis 204, and the first step surface 2531 begins to move towards the third step surface 2563 until the first step surface 2531 and the third step surface 2563 are in contact. At this 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 towards the pusher 253, in this embodiment, a pushing force along the third axis 203 is provided for the compression spring. Meanwhile, the first step surface 2531 and the third step surface 2563 are two planes parallel to the fourth axis 204. The driving force generated by the second biasing element 254 will cause the first step surface 2531 and the third step surface 2563 to directly abut against each other, but will not generate a component force along the direction of the fourth axis 204, causing the pushing member 253 and the first locking member 256 to move relative to each other, ensuring that the shaft lock assembly is kept in the first state. In other alternative embodiments, the first step surface and the third step surface can be provided with an interlocking structure to ensure stable contact between the first step surface and the third step surface, and relative movement can only occur when the external force exceeds a preset force. When the shaft lock assembly needs to switch from the first state to the second state, the pushing member 253 is pushed in the opposite direction along the fourth axis 204. The second step surface 2532 begins to slide toward the third step surface 2563. When the first step surface 2531 disengages from the third step surface 2563, the second biasing element 254 pushes the first locking member 256 toward the pushing member 253, and the second step surface 2532 contacts the third step surface 2563, and the shaft lock assembly is in the second state.

[0075] Reference Figure 13-14 As shown, in the third embodiment of the shaft locking mechanism of this solution, the difference lies only in the operating component and the locking component.

[0076] In the shaft locking mechanism 35, the operating component 35c includes a knob 353, which is partially located outside the housing and is used by the user to rotate the knob 353 so that it rotates on the housing about a third axis 303, which is perpendicular to the second axis 102.

[0077] The locking assembly 35c includes a first locking element 356 and a second biasing element 354. The first locking element 356 includes a first end 3561 and a second end 3562. The first end 3561 is located near the knob 353, and the second end 3562 is located near the output shaft 12 and is connected to the shaft locking lever 351. The first end 3561 has a first surface 3564.

[0078] The knob 353 has a limiting part at the contact point with the housing so that when the knob 353 rotates around the third axis 303, the limiting part restricts the movement of the knob 353 in the direction along the third axis 303.

[0079] One end of the second biasing element 354 is connected to the second locking member 356, and the other end is connected to the receiving part or other parts that do not move with the shaft locking mechanism 35. The second biasing element 354 generates a biasing force for the first locking member 356 to drive the first locking member 356 toward the knob member 353. Preferably, the second biasing element 354 is a compression spring.

[0080] The knob 353 is connected to the first surface 3564 of the second locking member 356. A height difference is provided on the contact surfaces of the knob 353 and the first surface 3564. When the knob 353 rotates about the third axis 103, the second locking member 356 moves linearly along the direction of the third axis 303. In this embodiment, the knob 353 and the first surface 3564 are connected by an inclined surface. In other alternative embodiments, the knob 353 and the first end 3561 are connected by a thread or helical teeth.

[0081] Reference Figure 15-21 As shown, in the fourth embodiment of the shaft locking mechanism of this solution, the shaft locking mechanism differs from that in the first embodiment.

[0082] Reference Figure 15 As shown, a table saw 400 is used as an example of a power tool. The table saw 400 includes a worktable 40, a motor 41, and an output shaft 42. The output shaft 42 is used to connect a rotary cutting element, which in this embodiment is a saw blade 44. 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 between the first and second axes do not affect the substantive content of this application. In this embodiment, the first axis and the second axis 402 do not coincide.

[0083] A 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 includes a shaft locking assembly 45a, an operating part 45b, and a locking assembly 45c. The shaft locking assembly 45a includes 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 ease of reference, shaft locking plate 451 is used instead of second shaft locking member 451, but this should not be construed as a limitation of this application. The shaft locking plate 451 rotates about a fifth axis 405 parallel to the second axis 402. The first shaft locking member 452 is a ring. For ease of reference, ring locking 452 is used instead of first shaft locking member 452, but this should not be construed as a limitation of this application. The ring locking 452 is connected to or formed outside the output shaft 42. In this embodiment, the ring locking 452 is formed by an inner flange. A non-circular locking part 452a is provided on the ring locking 452. The shaft locking plate 451 includes an actuating part 4511 and a releasing part 4512. The actuator 4511 is configured to selectively engage the locking part 452a. When the actuator 4511 is at least partially engaged with the locking part 452a, the output shaft 42 cannot rotate, and the shaft lock assembly 45a is in a first state. The release part 4512 is configured to be disposed on one side of the actuator 4511 along the movement direction of the shaft lock plate 451 and communicates with the actuator 4511. When the release part 4512 engages with the locking part 452a, the output shaft 42 is allowed to rotate, and the shaft lock assembly 45a is in a second state.

[0085] In this embodiment, the shaft lock assembly 45a further includes a guide member 45d. The guide member 45d drives at least one of the locking part 452a and the actuating part 4511 to rotate relative to each other, causing the actuating part 4511 to engage the locking part 452a, and the shaft lock assembly 45a is in a first state. The guide member 45d includes a first rotating part 455 and a first pushing part 465. The first rotating part 455 is connected to or formed on the first shaft lock member, that is, the first rotating part 455 is located on the ring 452 of the output shaft. The first pushing part 465 is disposed between the release part 4512 and the actuating part 4511. The first pushing part 465 drives the first rotating part 455 to rotate, causing the actuating part 4511 to engage the locking part 452a. In this embodiment, the first pushing part 465 is disposed on the second shaft lock member. The first pushing part is at least partially disposed on the portion where the release part 4512 and the actuating part 4511 communicate. The first pushing part drives the first rotating part to move synchronously.

[0086] In this embodiment, a toothed structure is formed on the outer periphery of the output shaft sleeve 452 to form the first rotating part 455, while no toothed structure is provided on the plane of the actuating part 4511. The first pushing part 465 is provided with a toothed structure that meshes with the first rotating part 455.

[0087] In this embodiment, the shaft locking plate 451 rotates along a fifth axis 405 parallel to the second axis 402. The shaft locking plate 451 has a front end and a rear end along the circumferential direction of the fifth axis 405. The actuator 4511 is located near the front end, and the release part 4512 is located near the rear end. The shaft locking plate 451 is sleeved on the ring sleeve 452.

[0088] The operating part 45b is located outside the worktable 40 and is located at one end of the shaft lock plate 451, so that the user can switch the shaft lock assembly 45a to the first state and the second state by rotating the operating part 45b.

[0089] When the shaft lock assembly 45a is in the second state, the release part 4512 of the shaft lock plate 451 is sleeved on the ring 452. When the user rotates the operating part 45b, the shaft lock plate 451 rotates about the fifth axis 405. At this time, the first pushing part 465 and the first rotating part 455 mesh with each other, and the first pushing part 465 drives the first rotating part 455 to rotate about the second axis 402. When the shaft lock assembly 45a is in the first state, the first pushing part 465 disengages from the first rotating part 455, and the actuating part 4511 of the shaft lock plate 451 is sleeved on the locking part 452a, locking the rotation of the output shaft 42. The locking assembly 45c locks the shaft lock plate 451, thereby locking the shaft lock assembly 45a in the first state.

[0090] The locking assembly 45c includes a limiting part 454 and a receiving part 456. The limiting part 454 is disposed on the outside of the motor shaft, specifically on the receiving part 431 or other parts that do not move with the shaft locking mechanism. At least one limiting part 454 is provided. The receiving part 456 is disposed 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 in or connected to the receiving part 456, the movement of the shaft locking plate 451 along the fifth axis 405 is restricted, 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 disengages from the receiving part 456, the shaft locking plate 451 is allowed to move along the fifth axis 405, 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 that matches the diameter of the limiting rod.

[0092] The limiting part 454 also includes an elastic element 458 disposed on the limiting rod and a guide surface 457 for at least one of the limiting part 454 and the receiving part 456. The guide surface 457 is disposed on the limiting rod and is the contact surface between the limiting rod and the limiting hole. Preferably, the guide surface 457 is an arc surface. When the limiting rod is not in the limiting hole, it is compressed and stores energy by the elastic element 458. When the arc surface of the limiting rod aligns with the limiting hole, the elastic element 458 rebounds, causing the limiting rod to automatically enter the limiting hole.

[0093] When the axis lock assembly 45a is in the first state, the power tool cannot be used. Taking a table saw as an example, when the operating component is in the first position, the table insert cannot be installed, and the table saw cannot be started.

[0094] Reference Figure 22-25 As shown, in the fifth embodiment of the shaft locking mechanism of this solution, the difference from the first embodiment of the shaft locking mechanism lies in the shaft locking component.

[0095] In this embodiment, the power tool used is a miter saw 500.

[0096] The second shaft locking component includes a shaft locking plate 551, which is connected to or formed on the output shaft 52 or the motor shaft 511. In other alternative embodiments, the shaft locking plate 551 may also be connected to or formed on the second gear 543 or the first gear 542. The television 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 parallel to each other.

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

[0098] The shaft locking plate 551 includes an actuating part 5511 and a releasing part 5512. The actuating part 5511 is configured to selectively engage a locking part 552a. When the actuating part 5511 is at least partially engaged with the locking part 552a, the motor shaft 511 cannot rotate. The releasing part 5512 is configured to be located on one side of the actuating part 5511 along the direction of movement of the shaft locking part 551 and communicates with the actuating part 5511. When the releasing part 5512 is engaged with the locking part 552a, the motor shaft 511 is allowed to rotate.

[0099] In this embodiment, the shaft locking plate 551 moves along a third axis 503 direction perpendicular to the first axis 501 of the motor shaft 511. The shaft locking plate 551 has a front end and a rear end along the direction of the third axis 503. The actuating part 5511 is located near the front end, and the releasing part 5512 is located near the rear end. The actuating part 5511 is sleeved on the ring 552. When the shaft locking assembly is in the first state, the actuating part 5511 is embedded in or tightly surrounds the locking part 552a to lock the rotation of the motor shaft 511. The releasing part 5512 is sleeved on the ring 552. The releasing part 5512 and the locking part 552a are substantially non-contact or not in contact at all, and the motor shaft 511 is allowed to rotate within the releasing part 5512.

[0100] The operating component 55c includes an operating part 553 disposed outside the housing 53. The operating part 553 is located at one end of the shaft locking plate 551, allowing the user to switch the shaft locking assembly to a first state and a second state by pushing or pulling the operating part 553. In this embodiment, the operating part 553 is located at the front end. The user pushes the operating part 553 into the housing 53, causing the actuator 5511 of the shaft locking plate 551 to engage the locking part 552a. Pulling the operating part 553 outward from the housing 53 switches the shaft locking assembly from the first state to the second state. In other alternative embodiments, the operating part 553 may be located at the rear end, and the user's operation of switching between the first and second states is the reverse of this embodiment.

[0101] The locking assembly includes a limiting part 555 and a receiving part 556. The limiting part 555 is disposed on the outside of the motor shaft, specifically on a receiving part or other component that does not move with the shaft locking mechanism. At least one limiting part 555 is provided. The receiving part 556 is disposed 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 in or connected to the receiving part 556, the movement of the shaft locking plate 551 along the third axis 503 is restricted, and the shaft locking assembly is locked in the first state. When the user triggers the operating component again to switch the shaft locking assembly to the second state, the limiting part 555 disengages 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 lock assembly 55a also includes guide members, comprising: a plurality of permanent magnets 559 mounted along the third axis 503, with some permanent magnets 559 disposed near the front end of the shaft lock plate 551 and some permanent magnets 559 disposed near the rear end of the shaft lock plate 551. A metal plate on the shaft lock plate, attracted to the permanent magnets, is formed on or attached to the shaft lock portion 551. The two provide mutually attracting magnetic force, allowing the second shaft lock member and the actuator to automatically align and enter position.

[0103] As an alternative, the limiting part in the locking component of this embodiment can also be replaced by a permanent magnet, and the receiving part in this embodiment can be replaced by a metal plate on the shaft locking plate that attracts the permanent magnet.

[0104] As an alternative implementation, the shaft locking plate moves in a direction perpendicular to the first axis. The shaft locking plate has a first groove and a second groove in this direction. The first groove is used to engage with a non-circular structural portion of the rotatable power output shaft, and the second groove is used to mount a fastener. The first groove has a locking part and an unlocking part. An operating component drives the shaft locking plate to move in a direction perpendicular to the first axis, selectively engaging the locking part or the unlocking part with the non-circular structural portion of the rotatable power output shaft to lock or unlock the rotatable power output shaft. The second groove connects to the fastener. When the locking part engages with the non-circular structural portion of the rotatable power output shaft, the fastener locks the movement of the shaft locking plate. Preferably, the fastener automatically locks the shaft locking plate, and releases it upon user intervention. In other embodiments, the fastener can manually lock or release the shaft locking plate.

[0105] Reference Figure 26-30 As shown, the sixth embodiment of the shaft locking mechanism in this solution differs from the fourth embodiment in that the locking component and the guiding component are different.

[0106] In this embodiment, a ring 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 this embodiment, the limiting portion 655 of the locking component 65c is a rocker arm. The receiving portion 656 includes a curved groove formed on the shaft locking plate 651. In this embodiment, the limiting portion 655 is a rocker arm, and the receiving portion 656 is a curved groove. In the following description, the rocker arm 655 will be used to replace the limiting portion 655, and the curved groove 656 will be used to replace the receiving portion 656. However, this should not be construed as a limitation of the present invention.

[0108] The curved groove 656 includes a first groove 6561 and a second groove 6562, both of which can receive one end of the rocker arm 655. The first groove 6561 is located near the release part 6512, and the second groove 6562 is located near the actuation part 6511. When the shaft lock assembly is in the first state, one end of the rocker arm 655 is embedded in the second groove 6562, restricting the movement of the shaft lock plate 651 along the third axis 603, and the shaft lock assembly 65a is locked in the first state. When the user triggers the operation part 653 again, switching the shaft lock assembly 65a to the second state, one end of the rocker arm 655 slides from the second groove 6562 to the first groove 6561, and the shaft lock assembly 65a is in the second state.

[0109] The shaft lock assembly 65a further includes a guide surface 658 and an elastic element 659 disposed in the receiving portion 665. The guide surface 658 includes a first sliding section 6581 connecting the first groove 6561 and the second groove 6562 and driving the end of the rocker arm 655 out of the first groove 6561; a first driving section 6582 connecting the first sliding section 6581 and driving the end of the rocker arm 655 into the second groove 6562; a second sliding section 6583 connecting the second groove 6562 and driving the end of the rocker arm 655 out of the second end; and a second driving section 6584 connecting the second sliding section 6583 and driving the end of the rocker arm 655 into the first groove 6561. The connection between the second sliding section 6583 and the second driving section 6584 is located at the front end of the second groove 6562. The elastic element 659 connects the shaft lock plate 651 and the rear end along the direction of the third axis 603, that is, the end of the shaft lock plate 651 near the release portion. Preferably, the elastic element 659 is a tension spring.

[0110] When the shaft lock assembly 65a is in the second state, the release part 6512 of the shaft lock plate 651 is sleeved on the ring 652, and the end of the rocker arm 655 is embedded in the first groove 6561. The user presses the operating component, causing the operating part 653 to move towards the rear end of the shaft locking plate along the direction of the third axis 603. The elastic element 659 begins to store force, and the end of the rocker arm 655 moves along the first sliding section 6581 towards the first driving section 6582. After entering the first driving section 6582, the user presses the shaft locking plate 651 of the operating component, causing the end of the rocker arm 655 to abut against the first driving section 6582. Consequently, the shaft locking plate 651 can no longer move towards the rear end. The user releases the operating component, and the elastic element 659 rebounds, pushing the shaft locking plate 651 towards the front end along the direction of the third axis 603. The first driving section 6582 guides the end of the rocker arm 655 into the second groove 6562. At this time, the shaft locking component 65a is in the first state, and the actuating 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 pulling force of the elastic element 659 along the direction of the third axis 603 toward the front end of the shaft locking plate is locked by the second groove 6562, and the first state of the shaft locking assembly 65a is locked. The user presses the operating component again, causing it to move towards the rear end of the shaft locking plate along the direction of the third axis 603. The elastic element 659 continues to be stretched, and the end of the rocker arm 655 disengages from the second groove 6562 along the second slide 6583. When it is at the connection between the second slide 6583 and the second drive section 6584, the end of the rocker arm 655 presses against the connection between the second slide 6583 and the second drive section 6584, thus preventing the shaft locking plate 651 from moving towards the rear end. The user releases the operating component, and the elastic element 659 rebounds, pushing the shaft locking plate 651 towards the front end of the shaft locking plate along the direction of the third axis 603. The second drive section 6584 guides the end of the rocker arm 655 into the first groove 6561, and the release part 6512 is fitted onto the ring 652. At this time, the shaft locking assembly 65a is in the second state.

[0111] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. An electric tool, comprising: A motor, including a drive shaft that rotates about a first axis; The output shaft is used to connect working accessories; The output shaft is driven by the motor to rotate around the second axis; Its characteristic is that it further includes: Axis locking mechanism, including: A shaft locking assembly includes a first state that restricts the rotation of the output shaft and a second state that releases the rotation of the output shaft. The shaft lock assembly includes: A locking part is formed or connected to the drive shaft or the output shaft; The actuator can optionally engage the locking part; When the shaft lock assembly is in the second state, the locking part engages with the release part. A guide member drives at least one of the locking part and the actuating part to rotate relative to each other, causing the actuating part to engage the locking part, wherein the shaft lock assembly is in the first state; The guide includes a first pushing part, which is connected to or formed on the execution part, and the release part and the execution part are respectively disposed on both sides of the first pushing part.

2. The power tool according to claim 1, characterized in that, The guide includes: a first rotating part, wherein the first rotating part is connected to or formed on the locking part; the first pushing part drives the first rotating part to rotate so that the actuating part engages the locking part.

3. The power tool according to claim 2, characterized in that, The shaft lock assembly includes: A first shaft locking member, wherein the locking part is disposed on the first shaft locking member, and the first shaft locking member is formed or connected to the drive shaft or the output shaft; The second shaft locking member is provided with the actuator disposed on the second shaft locking member, and the second shaft locking member is sleeved on the first shaft locking member and reciprocates relative to the first shaft locking member.

4. The power tool according to claim 3, characterized in that, The release part is provided on the second shaft lock.

5. The power tool according to claim 3, characterized in that, The first rotating part is disposed on the first shaft locking member, and the first pushing part is disposed on the second shaft locking member.

6. The power tool according to claim 2, characterized in that, The first pushing part drives the first rotating part to move synchronously.

7. The power tool according to claim 6, characterized in that, The first rotating part and the first pushing part are respectively provided with meshing teeth.

8. The power tool according to claim 1, characterized in that, The shaft locking mechanism further includes: an operating part for driving the guide member to drive at least one of the locking part and the actuating part.

9. The power tool according to claim 1, characterized in that, The shaft locking mechanism further includes a locking component configured to restrict the relative movement between the actuator and the locking portion when the shaft locking component is in the first state.

Images