Multifunctional electric tool anti-pinch tool locking structure

Abstract

The utility model discloses a multifunctional electric tool's anti -clamping hand cutter locking structure, including the output shaft and control device of rotation setting in the head shell, is equipped with installation device on the output shaft, and installation device includes fixed mounting part and movable pressing plate, and control device includes the trigger of being equipped with cam part and setting on the pressing mechanism of output shaft, and the trigger rotation is connected on the head shell, and the pressing mechanism includes linkage, tensioning piece, first elastic part and second elastic part, and the cam part of trigger rotation can press down linkage, and movable pressing plate is connected with tensioning piece, and the multiple stages of gear are equipped on one of tensioning piece and output shaft, and the other is equipped with cooperation department, and the guide edge one is equipped between each gear, and linkage can move with tensioning piece after being pressed, and cooperation department enters different gear along guide edge one, to change the high and low position of tensioning piece on the axial direction of output shaft, and the gear that conversion cooperation department enters makes installation device can keep in installation state, and plays anti -trigger clamping hand.

Description

Technical Field

[0001] This invention relates to a power tool, and more particularly to a hand-pinch-proof knife locking structure for a multi-functional power tool. Background Technology

[0002] Handheld power tools (also known as multi-tools or all-purpose power tools) on the market have detachable blades that can oscillate at high frequency and small amplitude at the head. In practical applications, these tools can achieve various working modes such as cutting, slicing, and grinding through the high-frequency oscillation of the blades. Currently, there are various styles of blade locking structures on power tools on the market, among which the rear eccentric lifting type is popular among users due to its advantage of quick tool changing without the need for additional tools.

[0003] An example of a rear-eccentric lifting mechanism is the working head changing device in a multi-functional handheld power tool disclosed in patent CN203390900U. This device includes a head housing, a working head locking wrench with a quick-clamp cam, and the working head locking wrench and quick-clamp cam hinged to the top of the head housing via a pin. The head housing contains a quick-clamp drive shaft with a stepped inner cavity. The bottom of the quick-clamp drive shaft has a quick-clamp pressure spring plate and a positioning pin. A quick-clamp mandrel with a shoulder is movably mounted within the quick-clamp drive shaft. The upper end of the quick-clamp mandrel extends out of the quick-clamp drive shaft, and the lower end moves through the quick-clamp pressure spring plate to mount the working head pressure plate. A quick-clamp pressure spring is located between the shoulder of the quick-clamp mandrel and the quick-clamp pressure spring plate. Under the elastic force of the quick-clamp pressure spring, the quick-clamp mandrel moves upward, clamping the working head between the working head pressure plate and the quick-clamp drive shaft. When the quick-clamp cam rotates around the pin, the outer contour surface of the quick-clamp cam gradually presses downward against the quick-clamp mandrel until the working head pressure plate moves to a position convenient for disassembling and assembling the working head.

[0004] The aforementioned method of locking and unlocking by flipping the trigger up and down has the following problems: Since the working head plate needs to press the tool in the working state, the spring must have a large elastic force applied to the quick-clamp spindle to drive the working head plate to form sufficient upward pressure on the tool. This structure means that when the tool is removed and the flip-down lever is returned to its original position, since there is no tool between the working head plate and the quick-clamp drive shaft, the quick-clamp spindle will be pushed upward to a higher position by the spring with a large force. The quick-clamp spindle pushed upward to a higher position can forcefully push the trigger down to the bottom at a relatively fast speed by acting on the quick-clamp cam of the trigger. The trigger that has been flipped down to the bottom will be clamped in the hand of the person who flipped the trigger down, causing injury to the user. Summary of the Invention

[0005] In view of the above-mentioned problem that the hand can be pinched by the trigger when the tool is not installed, the present invention provides a tool locking structure for preventing hand pinching in a multi-functional power tool.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a multi-functional power tool anti-pinch knife locking structure, including an output shaft rotatably disposed in the head shell, and a mounting device for mounting a knife is provided on the output shaft. The mounting device has a working state and an installation state. When the mounting device is in the working state, it can drive the knife to move together with the output shaft. When the mounting device is in the installation state, it allows the knife to be mounted on the mounting device or allows the knife to be removed from the mounting device. The mounting device includes a fixed mounting part fixed on the output shaft and a movable pressure plate located below the fixed mounting part. A clamping distance for mounting the tool is formed between the movable pressure plate and the fixed mounting part. The movable pressure plate moves relative to the fixed mounting part along the axial direction of the output shaft, so that the mounting device switches between the working state and the mounting state. It also includes a control device for controlling the switching of the installation device state. The control device includes a trigger with a cam and a pressing mechanism set on the output shaft. The trigger is rotatably connected to the head shell. The pressing mechanism includes a linkage, a tensioning member, a first elastic member, and a second elastic member. The linkage is located at a relative position below the cam. Rotating the trigger can cause the cam to press down on the linkage. The first elastic member acts on the linkage and has a spring force to drive the linkage upward. The second elastic member acts on the tensioning member and has a spring force to drive the tensioning member upward. The spring force of the second elastic member is greater than that of the first elastic member. The movable pressure plate is connected to the tensioning member and can move axially with the tensioning member on the output shaft. The tensioning member and one of the output shafts are provided with multiple gear positions, and the other is provided with a mating part. A guide edge is provided between each gear position. When the linkage is pressed, it can move the tensioning member, so that the mating part enters different gear positions along the guide edge to change the height position of the tensioning member on the output shaft axially. The shift position of the engagement part allows the mounting device to remain in the installed state.

[0007] A further preferred embodiment of the present invention is as follows: the gear positions include multiple gear positions one and multiple gear positions two, the multiple gear positions one are arranged circumferentially along the axis of the output shaft, a gear position two is provided between each two adjacent gear positions one, and a guide edge one is provided between gear positions one and gear positions two. When the mating part enters position one, the mounting device is in working state; when the mating part enters position two, the mounting device is in installation state.

[0008] A further preferred embodiment of the present invention is as follows: Multiple tooth sets are provided circumferentially along the output shaft axis on the outer side wall of the tensioning member. Adjacent tooth sets are spaced apart to form a vertical spacing groove between them. This spacing groove serves as the first stop. Each tooth set includes two connected inclined teeth, forming a tooth groove between them. This tooth groove serves as the second stop. The inclined surface of the inclined teeth serves as a guide edge, with each guide edge pointing in the same direction. The output shaft is provided with a mating part that cooperates with the stop. When the linkage is continuously pressed, the tensioning member rotates continuously in one direction. Each stop sequentially engages with the mating part.

[0009] A further preferred embodiment of the present invention is as follows: the output shaft has an inner cavity and an opening at the upper end, an end cap is connected to the upper end of the output shaft, the end cap has a channel that runs vertically through it, a mating part is provided on the inner wall of the channel, a linkage is disposed in the channel, the upper end of the linkage extends out of the channel and is opposite to the cam part, the tensioning part is disposed in the inner cavity, the upper end of the tensioning part is inserted upward into the channel, and the mating part in the channel enters one of the gear positions.

[0010] A further preferred embodiment of the present invention is as follows: a plurality of action parts are provided on the side wall of the linkage member along the circumferential direction of the output shaft axis, with adjacent action parts spaced apart, and a vertical guide groove is formed between adjacent action parts. The mating part slides with the guide groove to restrict the linkage member to move axially on the output shaft. An annular step is provided in the channel to limit the action parts above the action parts. The action parts are opposite to the guide edge on the tensioning member. When the linkage member is pressed, the action parts act on the guide edge to cause the tensioning member to move down and disengage from the mating part before rotating.

[0011] A further preferred embodiment of the present invention is that the lower surface of the functional part is an inclined surface that cooperates with the guide edge, and the lower surface of the mating part is an inclined surface that cooperates with the guide edge.

[0012] A further preferred embodiment of the present invention is that the groove depth of the spacing groove in the output shaft axial direction is greater than the groove depth of the tooth groove in the output shaft axial direction.

[0013] A further preferred embodiment of the present invention is as follows: the cam part is provided at one end of the trigger, and the end of the trigger with the cam part is rotatably connected to the head shell through a connecting shaft. When the trigger is flipped upward, the cam part presses down on the linkage component, and when the trigger is flipped downward, the linkage component moves upward to reset. The head shell is provided with a locking element, which is used to lock the trigger rotation when it is in the flipped-over state.

[0014] A further preferred embodiment of the present invention is as follows: the tensioning member is provided with a connecting hole, the movable pressure plate is provided with a connecting rod inserted into the connecting hole, the connecting hole is provided with a locking surface, the connecting rod is provided with a snap-fit ​​surface, the connecting rod inserted into the connecting hole has a release position and a snap-fit ​​position relative to the tensioning member, and the connecting rod is rotated to switch between the release position and the snap-fit ​​position. When the connecting rod is in the snap-fit ​​position, the snap-fit ​​surface is engaged above the locking surface to prevent the connecting rod from disengaging from the connecting hole along the axial direction of the output shaft. When the connecting rod is in the released position, the engaging surface and the locking surface are disengaged, and the connecting rod can disengage from the connecting hole along the axial direction of the output shaft downwards.

[0015] A further preferred embodiment of the present invention is that the locking surface is an inclined surface, and the inclined locking surface restricts the connecting rod from rotating from the latching position to the releasing position.

[0016] Compared with the prior art, the advantages of this invention are that it can control the cam part to press down the linkage by rotating the trigger, so that the mating part enters different positions along the guide edge, thereby changing the height position of the tensioning member in the output shaft axis. This changes the position of the movable pressure plate relative to the fixed mounting part in the output shaft axis, realizing the switching of the mounting device state. By changing the position of the mating part, the mounting device can be kept in the installed state. When the user is installing or removing the tool, there is no need to keep one hand controlling the trigger to keep the mounting device in the installed position, which facilitates the installation and removal of the tool. In addition, when the tool is not installed, the tensioning member can be locked in the lower position in the output shaft axis by the engagement of the position and the mating part, which restricts the second elastic member from driving the tensioning member to move upward, so that the mounting device is kept in the installed state. This prevents the large upward force of the second elastic member from being transmitted to the trigger and forcibly pushing the trigger down to the bottom at a fast speed. The elastic force of the first elastic member is small and only serves to drive the linkage to reset. Its elastic force is insufficient to drive the trigger to rotate. Therefore, this structure can prevent the trigger from pinching the hand when the tool is not installed.

[0017] This patented method involves turning the trigger once to control the cam part to press down the linkage once, thereby changing the engagement position of the mating part once. This method of adjusting the state of the installation device by pressing is simple to operate, conforms to existing operating habits, and is easy to learn. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0019] Figure 1This is a side view of the patent when the mounting device is in operation; Figure 2 This is a cross-sectional view of the installation device when it is in operation. Figure 3 A cross-sectional diagram showing the cam section pressing down on the linkage when the trigger flips up; Figure 4 This is a side view of the mounting device when it is in the installation state. Figure 5 This is a cross-sectional view of the installation device in the installation state. Figure 6 Exploded view of the output shaft and pressing mechanism; Figure 7 This is a schematic diagram of the end cap structure; Figure 8 This is a structural schematic diagram of the linkage component; Figure 9 Schematic diagram of the tensioning component Figure 1 ; Figure 10 Schematic diagram of the tensioning component Figure 2 ; Figure 11 Schematic diagram of the tensioning component Figure 3 ; Figure 12 This is a schematic diagram of the movable pressure plate. Figure 13 A simplified diagram illustrating the momentary engagement of the gear shift. Figure 14 A simplified diagram illustrating the engagement of the gear shift into position two. Figure 15 This is a cross-sectional view of the trigger mechanism of this patent when it is tipped over; Figure 16 for Figure 15 A magnified view of part A; Figure 17 This is an exploded view of the trigger and locking mechanism; Figure 18 The diagram shows the structure of two types of cutting tools.

[0020] In the diagram: 1. Head shell; 2. Cutting tool; 3. Mounting device; 4. Trigger; 5. Linkage component; 6. Connecting shaft; 7. Cam part; 8. Channel; 9. Bearing; 10. End cover; 11. Tensioner; 12. Second positioning groove; 13. Outer ring protrusion; 14. Locking spring; 15. Fixed mounting part; 16. Positioning hole; 17. Positioning protrusion; 18. Second through hole; 19. Movable pressure plate; 20. First through hole; 21. Inner cavity; 22. Connecting rod; 23. Reset washer; 24. Reset spring; 25. First 26. Positioning groove; 27. Output shaft; 28. Boss; 29. ​​Mating part; 30. Annular step; 31. Actuating part; 32. Guide groove; 33. Inclined tooth; 34. Spacing groove; 35. Tooth assembly; 36. Guide edge one; 37. Tooth groove; 38. Locking block; 39. Locking surface; 40. Stop edge; 41. Connecting hole; 42. Snap-fit ​​surface; 43. Snap-fit ​​joint; 44. Stop one; 45. Stop two; 46. Locking plate; 47. Buckle; 48. Locking hole; 49. Elastic edge; 50. Horizontal plate; 51. Locking element. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0022] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0023] Figures 1-18 As shown, the anti-pinch tool locking structure of the multi-functional power tool includes an output shaft 26 rotatably disposed inside the head housing 1. The output shaft 26 is provided with a mounting device 3 for mounting a tool 2. The mounting device 3 has a working state and a mounting state. When the mounting device 3 is in the working state, it can drive the tool 2 to move together with the output shaft 26. When the mounting device 3 is in the mounting state, it allows the tool 2 to be mounted on the mounting device 3 or allows the tool 2 to be removed from the mounting device 3.

[0024] Figures 1-6As shown, the mounting device 3 includes a fixed mounting part 15 fixed on the output shaft 26 and a movable pressure plate 19 located below the fixed mounting part 15. A clamping distance for mounting the tool 2 is formed between the movable pressure plate 19 and the fixed mounting part 15. The movable pressure plate 19 cooperates with the fixed mounting part 15 to fix the tool 2 between them. The movable pressure plate 19 moves relative to the fixed mounting part 15 along the axial direction of the output shaft 26 to adjust the size of the clamping distance, so that the mounting device 3 can switch between the working state and the mounting state. The working state refers to the state in which the movable pressure plate 19 and the fixed mounting part 15 are clamped together, and the mounting state refers to the state in which the movable pressure plate 19 and the fixed mounting part 15 are open to each other.

[0025] The lower end of the output shaft 26 extends out of the head housing 1. The fixed mounting part 15 is a tool flange fixed to the lower end of the output shaft 26. A raised boss 27 is provided on the end face of the lower end of the output shaft 26. The tool flange is fitted onto the boss 27 and abuts against the end face of the lower end of the output shaft 26. A positioning protrusion 17 corresponding to the positioning hole 16 on the tool 2 is provided on the lower end face of the tool flange. The tool flange can be tightly fitted and fixed to the boss 27, or fixed by a pin connection.

[0026] Figures 6-14 As shown, the anti-pinch knife locking structure also includes a control device for controlling the state switching of the mounting device 3. The control device includes a trigger 4 with a cam portion 7 and a pressing mechanism mounted on the output shaft 26. The trigger 4 is rotatably connected to the head shell 1. The pressing mechanism includes a linkage 5, a tensioning member 11, a first elastic member, and a second elastic member. The linkage 5 is located at a relative position below the cam portion 7. Rotation of the trigger 4 causes the cam portion 7 to press down on the linkage 5. The first elastic member acts on the linkage 5 and has a spring force that drives the linkage 5 to move upward. The second elastic member acts on the tensioning member 11. It also has the elastic force to drive the tensioning member 11 to move upward. The elastic force of the second elastic member is greater than that of the first elastic member. The movable pressure plate 19 is connected to the tensioning member 11 and can move with the tensioning member 11 in the axial direction of the output shaft 26. The tensioning member 11 and the output shaft 26 are provided with multiple gear positions on one of them and a mating part 28 on the other. A guide edge 35 is provided between each gear position. When the linkage member 5 is pressed, it can move the tensioning member 11, so that the mating part 28 enters different gear positions along the guide edge 35 to change the height position of the tensioning member 11 in the axial direction of the output shaft 26.

[0027] The engagement position of the conversion fitting part 28 allows the mounting device 3 to remain in the installed state.

[0028] This patent allows the trigger 4 to rotate, controlling the cam 7 to press down the linkage 5, causing the mating part 28 to enter different positions along the guide edge 35. This changes the height of the tensioning part 11 in the output shaft 26, thereby changing the position of the movable pressure plate 19 relative to the fixed mounting part 15 in the output shaft 26, and switching the state of the mounting device 3. By changing the position of the mating part 28, the mounting device 3 can be kept in the mounting state. When the user disassembles or assembles the tool 2, there is no need to keep one hand controlling the trigger 4 to keep the mounting device 3 in the mounting position, which facilitates the disassembly and assembly of the tool 2. Furthermore, when the tool 2 is not installed, the tensioning member 11 can be locked in a low position along the output shaft 26 by engaging with the stop and the mating part 28. This restricts the second elastic member from driving the tensioning member 11 to move upward, keeping the mounting device 3 in the installed state. This prevents the large upward force of the second elastic member from being transmitted to the trigger 4, which would force the trigger 4 to flip down to the bottom at a relatively fast speed. The elastic force of the first elastic member is small and only serves to drive the linkage 5 to reset. Its elastic force is insufficient to drive the trigger 4 to rotate, so that the structure can prevent the trigger 4 from pinching the hand when the tool 2 is not installed.

[0029] This patent allows the cam section 7 to press down the linkage 5 once by rotating the trigger 4 once, thereby changing the gear position of the mating section 28 once. The mating section 28 can be in different gear positions to keep the mounting device 3 in the working state and the installation state respectively. This method of adjusting the state of the mounting device 3 by pressing is simple to operate, conforms to the original operating habits, and is easy to learn.

[0030] The aforementioned gear positions include multiple gear positions 43 and multiple gear positions 44. The multiple gear positions 43 are arranged circumferentially along the axis of the output shaft 26. A gear position 44 is provided between each pair of adjacent gear positions 43. A guide edge 35 is provided between gear positions 43 and gear positions 44.

[0031] When the mating part 28 enters the first position 43, the mounting device 3 is in the working state; when the mating part 28 enters the second position 44, the mounting device 3 is in the installation state.

[0032] Specifically, the outer wall of the tensioning member 11 is provided with multiple tooth sets 34 circumferentially along the axis of the output shaft 26. Adjacent tooth sets 34 are spaced apart to form a vertical spacing groove 33 between them. The spacing groove 33 serves as the aforementioned stop 43. Each tooth set 34 includes two connected inclined teeth 32, with a tooth groove 36 formed between them. The tooth groove 36 serves as the second stop 44. The inclined surface of the inclined teeth 32 serves as a guide edge 35, with each guide edge 35 inclined in the same direction. The output shaft 26 is provided with a mating part 28 that cooperates with the stop. When the linkage 5 is continuously pressed, the tensioning member 11 rotates continuously in one direction, and each stop sequentially engages with the mating part 28. One side of the inclined tooth 32 is an inclined surface, and the other side is a vertical surface.

[0033] The groove depth of the spacing groove 33 in the axial direction of the output shaft 26 is greater than the groove depth of the tooth groove 36 in the axial direction of the output shaft 26. This makes the height of the tensioning member 11 in the axial direction of the output shaft 26 higher than the height of the tensioning member 11 in the axial direction of the output shaft 26 when the mating part 28 enters the spacing groove 33. This helps to adjust the relative position of the movable pressure plate 19 in the axial direction of the output shaft 26.

[0034] Preferably, when viewed from above, each guide edge 35 of the tensioning member 11 is inclined upward in a clockwise direction. When the linkage member 5 is continuously pressed, the tensioning member 11 rotates in a clockwise direction, so that each gear position rotates to the bottom of the mating part 28 in sequence to form a mating with the mating part 28.

[0035] The output shaft 26 has an inner cavity 21 with an opening at the top. An end cover 10 is connected to the upper end of the output shaft 26. The end cover 10 has a vertically penetrating channel 8. A mating part 28 is provided on the inner wall of the channel 8. A linkage 5 is disposed in the channel 8. The upper end of the linkage 5 extends out of the channel 8 and is opposite to the cam part 7. A tensioning member 11 is disposed in the inner cavity 21 and is located below the linkage 5. The upper end of the tensioning member 11 is inserted into the channel 8, and the mating part 28 in the channel 8 enters one of the gear positions.

[0036] The end cap 10 is threaded onto the upper end of the output shaft 26.

[0037] Multiple action parts 30 are provided on the side wall of the linkage 5 along the circumferential direction of the axis of the output shaft 26. Two adjacent action parts 30 are spaced apart, and a vertical guide groove 31 is formed between two adjacent action parts 30. The mating part 28 slides with the guide groove 31 to restrict the linkage 5 to move axially on the output shaft 26. The channel 8 is stepped, and an annular step 29 is formed inside. The annular step 29 is limited above the action parts 30 to restrict the linkage 5 from moving upward away from the channel 8. The action parts 30 are opposite to the guide edge 35 on the tensioning member 11. When the linkage 5 is pressed, the action parts 30 act on the guide edge 35 to make the tensioning member 11 move downward and rotate after disengaging from the mating part 28.

[0038] The number of actuating parts 30 is the same as the number of inclined teeth 32 on the tensioning member 11, and the actuating parts 30 and inclined teeth 32 are one-to-one. There are multiple mating parts 28 in the channel 8, and multiple mating parts 28 can simultaneously enter the first stop 43 or the second stop 44. For example, in this embodiment, the tensioning member 11 is provided with four sets of teeth 34 and the spacing grooves 33 located between the teeth 34. The linkage member 5 is provided with eight actuating parts 30 that are respectively opposite to the eight inclined teeth 32 and the guide grooves 31 located between the actuating parts 30. There are four mating parts 28 in the channel 8. The four mating parts 28 are respectively slidably engaged with the four guide grooves 31 on the linkage member 5. The four mating parts 28 are respectively engaged with the spacing grooves 33 at the same time, so that the mounting device 3 is in the working state. After the linkage member 5 is pressed, the four mating parts 28 can enter the tooth grooves 36 along the guide edge 35, so that the mounting device 3 is switched to the mounting state.

[0039] The lower surface of the actuating part 30 is an inclined surface that mates with the guide edge 35, and the lower surface of the mating part 28 is an inclined surface that mates with the guide edge 35, so that the sliding fit between the actuating part 30 and the mating part 28 and the guide edge 35 is smoother.

[0040] The first elastic element is a return spring 24. The lower end of the linkage 5 is provided with a first positioning groove 25, and the upper end of the tensioning element 11 is provided with a second positioning groove 12. The upper and lower ends of the return spring 24 are respectively inserted into the first positioning groove 25 and the second positioning groove 12. The return spring 24 is supported between the linkage 5 and the tensioning element 11 to provide an upward pushing force to the linkage 5.

[0041] The second elastic element is a locking spring 14. The outer wall of the tensioning member 11 is provided with an outer ring protrusion 13. The locking spring 14 is sleeved on the tensioning member 11. One end of the locking spring 14 abuts against the outer ring protrusion 13, and the other end of the locking spring 14 abuts against the bottom cavity wall of the inner cavity 21 to provide an upward pushing force to the tensioning member 11.

[0042] The gear adjustment principle is as follows: In the initial state, the mating part 28 is located in the spacing groove 33, and the mounting device 3 is in working condition. By flipping the trigger 4 upward, the cam part 7 presses down on the linkage 5. After the linkage 5 is pressed, the actuating part 30 moves down and acts on the guide edge 35 between the gears. The tensioning part 11 moves downward under the action of the actuating part 30, and the movable pressure plate 19 moves down with the tensioning part 11 until the mating part 28 disengages from the spacing groove 33. At this time, the tensioning part 11 rotates clockwise under the downward push of the actuating part 30 along the guide edge 35, so that the guide edge 35 located on one side of the spacing groove 33 rotates to below the mating part 28. When the user flips the trigger 4 downward... During the reversal, the upper part of the linkage 5 loses force, causing the reset spring 24 to push the linkage 5 upward to reset. After the linkage 5 is reset, the locking spring 14 pushes the tensioning member 11 upward, causing the guide edge 35 to contact the lower end of the mating part 28. The mating part 28 enters the tooth groove 36 along the guide edge 35. At this time, the tensioning member 11 is lower in the axial position of the output shaft 26 than in the working state. The movable pressure plate 19 and the fixed mounting part 15 are in an open state. The mounting device 3 switches to the mounting state, which allows the tool 2 to be inserted between the movable pressure plate 19 and the fixed mounting part 15, or the tool 2 between the movable pressure plate 19 and the fixed mounting part 15 to be removed. When it is necessary to lock the cutter 2 between the movable pressure plate 19 and the fixed mounting part 15, flip the trigger 4 upward again, causing the cam part 7 to press down on the linkage 5. After the linkage 5 is pressed, the actuating part 30 moves down and acts on the guide edge 35 between the stops. The tensioning part 11 moves downward under the action of the actuating part 30, and the movable pressure plate 19 moves down with the tensioning part 11 until the mating part 28 disengages from the tooth groove 36. At this time, the tensioning part 11 rotates clockwise under the downward push of the actuating part 30 along the guide edge 35, causing the guide edge 35 located on the tooth groove 36 to rotate to the mating part 28. Below 8, when the user flips the trigger 4 down to reset, the upper part of the linkage 5 loses force, causing the reset spring 24 to push the linkage 5 upward to reset. After the linkage 5 is reset, the locking spring 14 pushes the tensioning member 11 upward, causing the guide edge 35 to contact the lower end of the mating part 28. The mating part 28 enters the spacing groove 33 along the guide edge 35. At this time, the tensioning member 11 is axially higher on the output shaft 26 than it is in the installation state. The movable pressure plate 19 and the fixed mounting part 15 are clamped to fix the tool 2 between them, and the mounting device 3 switches to the working state.

[0043] During the rotation of the tensioning member 11, since the action part 30 is located on both sides of the mating part 28, regardless of whether the mating part 28 enters the first stop 43 or the second stop 44, the lower ends of the action parts 30 on both sides are opposite to the guide edges 35 on both sides of the first stop 43 or the second stop 44.

[0044] The movable pressure plate 19 is provided with a connecting rod 22, and the boss 27 is provided with a first through hole 20 communicating with the inner cavity 21. The connecting rod 22 passes upward through the first through hole 20 and connects with the tensioning member 11 in the inner cavity 21.

[0045] The tensioning member 11 is provided with a connecting hole 40. The connecting rod 22 on the movable pressure plate 19 is inserted into the connecting hole 40. The connecting hole 40 is provided with a locking surface 38. The connecting rod 22 is provided with a snap-fit ​​surface 41. The connecting rod 22 inserted into the connecting hole 40 has a release position and a snap-fit ​​position relative to the tensioning member 11. Rotating the connecting rod 22 allows it to switch between the release position and the snap-fit ​​position.

[0046] When the connecting rod 22 is in the engaged position, the engaging surface 41 engages above the locking surface 38 to prevent the connecting rod 22 from disengaging from the connecting hole 40 along the axial direction of the output shaft 26; when the connecting rod 22 is in the released position, the engaging surface 41 disengages from the locking surface 38, and the connecting rod 22 can disengage from the connecting hole 40 along the axial direction of the output shaft 26.

[0047] Figure 18 As shown, the cutter 2 has a second through hole 18 corresponding to the connecting rod 22. During installation, the connecting rod 22 passes through the second through hole 18, and the positioning protrusion 17 is inserted into the positioning hole 16 on the cutter 2. The movable pressure plate 19 is made detachable to accommodate two different installation methods for the cutter 2. One type of cutter 2 has an opening on the side of the second through hole 18, the size of which is not less than the diameter of the connecting rod 22. This type of open cutter 2 can move horizontally while the connecting rod 22 is connected to the tensioner 11 to insert the second through hole 18 into the connecting rod 22, and then move upward to insert the positioning protrusion 17 into the positioning hole 16 for installation. The other type of cutter 2 has a closed second through hole 18. When installing this type of closed cutter 2, the connecting rod 22 needs to be removed from the tensioner 11. The second through hole 18 of the cutter 2 is first aligned with the first through hole 20, and then the connecting rod 22 is passed upward through the second through hole 18 and the first through hole 20 to connect with the tensioner 11, thus installing the cutter 2.

[0048] The locking surface 38 is an inclined surface, which restricts the linkage 22 from rotating from the engaged position to the released position.

[0049] By setting an inclined locking surface 38, the situation where the movable pressure plate 19 falls downwards due to the vibration of the connecting rod 22 relative to the tensioner 11 and the inertia of the tensioner 11 rotating to the release position during the processing can be avoided, thus improving the stability of the operation. The snap-fit ​​surface 41 is an inclined surface that cooperates with the locking surface 38.

[0050] A locking block 37 protruding inward is provided on both sides of the lower end of the connecting hole 40. The upper surface of the locking block 37 serves as the locking surface 38. A snap-fit ​​connector 42 is provided at the upper end of the connecting rod 22. The snap-fit ​​connector 42 protrudes from both sides of the connecting rod 22. The lower surface of the protruding part of the snap-fit ​​connector 42 serves as the snap-fit ​​surface 41. After the snap-fit ​​connector 42 is inserted upward into the connecting hole 40, the connecting rod 22 is rotated so that the protruding parts on both sides of the snap-fit ​​connector 42 move to the top of the locking blocks 37 on both sides to form a snap-fit. A protruding stop 39 is provided on one side of the locking block 37. The stop 39 is connected to the lower side of the locking surface 38 to block the snap-fit ​​connector 42, so as to restrict the connecting rod 22 from rotating counterclockwise. This allows the connecting rod 22 to rotate clockwise relative to the tensioning member 11 to switch from the snap-fit ​​position to the release position.

[0051] A reset pad 23 is fixed in the middle of the connection hole 40. The reset pad 23 separates the connection hole 40, so that the upper half of the connection hole 40 serves as the second positioning groove 12.

[0052] Figures 15-17 As shown, the cam part 7 is located at one end of the trigger 4. The end of the trigger 4 with the cam part 7 is rotatably connected to the head shell 1 through the connecting shaft 6. When the trigger 4 flips up, the cam part 7 presses down the linkage 5. When the trigger 4 flips down, the linkage 5 moves up to reset.

[0053] The head shell 1 is provided with a locking element 50, which is used to lock the trigger 4 from rotating when it is in the flipped-over state. This prevents the cam part 7 from pressing the linkage 5 when the trigger 4 is not being operated.

[0054] The locking component 50 includes a horizontal plate 49 and elastic edges 48 on both sides of the horizontal plate 49. The upper end of the elastic edge 48 is provided with an outwardly protruding buckle 46, which is formed by bending the upper end of the elastic edge 48. The trigger 4 is provided with two spaced-apart locking plates 45, and the locking plates 45 are provided with locking holes 47. The horizontal plate 49 is fixed to the head shell 1 by screws.

[0055] When the trigger 4 is subjected to force and flips downward, the two buckles 46 are pressed into the space between the two locking plates 45 by the lower edge of the locking plate 45, and respectively lock into the locking holes 47 on the two locking plates 45 to restrict the rotation of the trigger 4; when the trigger 4 is subjected to force and flips upward, the two buckles 46 are pressed inward by the edge of the locking hole 47 and move out of the locking hole 47 to release the restriction on the rotation of the trigger 4.

[0056] The outer side of the cam part 7 is provided with a contour surface that cooperates with the linkage 5. The distance from each point on the contour curve of the contour surface to the axis of the connecting shaft 6 gradually increases from the lowest point of the contour curve in a clockwise direction, so that the linkage 5 can be pressed when the trigger 4 is rotated.

[0057] A bearing 9 is provided between the end cover 10 and the output shaft 26 and the head shell 1.

[0058] The above describes the anti-pinch knife locking structure for multifunctional power tools provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A multi-functional power tool anti-pinch knife locking structure, including an output shaft rotatably disposed in the head housing, and a mounting device for mounting a knife on the output shaft. The mounting device has a working state and an installation state. When the mounting device is in the working state, it can drive the knife to move together with the output shaft. When the mounting device is in the installation state, it allows the knife to be mounted on the mounting device or allows the knife to be removed from the mounting device. The mounting device includes a fixed mounting part fixed on the output shaft and a movable pressure plate located below the fixed mounting part. A clamping distance for mounting the tool is formed between the movable pressure plate and the fixed mounting part. The movable pressure plate moves relative to the fixed mounting part along the axial direction of the output shaft, so that the mounting device switches between the working state and the mounting state. Its features are, It also includes a control device for controlling the switching of the installation device state. The control device includes a trigger with a cam and a pressing mechanism set on the output shaft. The trigger is rotatably connected to the head shell. The pressing mechanism includes a linkage, a tensioning member, a first elastic member, and a second elastic member. The linkage is located at a relative position below the cam. Rotating the trigger can cause the cam to press down on the linkage. The first elastic member acts on the linkage and has a spring force to drive the linkage upward. The second elastic member acts on the tensioning member and has a spring force to drive the tensioning member upward. The spring force of the second elastic member is greater than that of the first elastic member. The movable pressure plate is connected to the tensioning member and can move axially with the tensioning member on the output shaft. The tensioning member and one of the output shafts are provided with multiple gear positions, and the other is provided with a mating part. A guide edge is provided between each gear position. When the linkage is pressed, it can move the tensioning member, so that the mating part enters different gear positions along the guide edge to change the height position of the tensioning member on the output shaft axially. The shift position of the engagement part allows the mounting device to remain in the installed state.

2. The anti-pinch knife locking structure for multifunctional power tools according to claim 1, characterized in that, The gear positions include multiple gear positions one and multiple gear positions two. The multiple gear positions one are arranged circumferentially along the axis of the output shaft. A gear position two is provided between each two adjacent gear positions one. A guide edge one is provided between the gear positions one and the gear positions two. When the mating part enters position one, the mounting device is in working state; when the mating part enters position two, the mounting device is in installation state.

3. The anti-pinch knife locking structure for multifunctional power tools according to claim 2, characterized in that, Multiple tooth sets are provided on the outer side wall of the tensioning member along the circumferential direction of the output shaft axis. Adjacent tooth sets are spaced apart to form a vertical spacing groove between them. The spacing groove serves as the first stop. Each tooth set includes two connected inclined teeth, and a tooth groove is formed between the two inclined teeth. The tooth groove serves as the second stop. The inclined surface of the inclined teeth serves as the first guide edge, and each first guide edge is inclined in the same direction. The output shaft is provided with a mating part that cooperates with the stop. When the linkage is continuously pressed, the tensioning member rotates continuously in one direction. Each stop sequentially cooperates with the mating part.

4. The anti-pinch knife locking structure for a multi-functional power tool according to claim 3, characterized in that, The output shaft has an inner cavity with an opening at the top. An end cap is connected to the top of the output shaft. The end cap has a through channel running vertically through it. A mating part is provided on the inner wall of the channel. A linkage is located in the channel. The upper end of the linkage extends out of the channel and is opposite to the cam part. The tensioning part is located in the inner cavity. The upper end of the tensioning part is inserted upward into the channel, and the mating part in the channel enters one of the gear positions.

5. The anti-pinch knife locking structure for a multi-functional power tool according to claim 4, characterized in that, The side wall of the linkage is provided with multiple action parts along the circumferential direction of the output shaft axis. Adjacent action parts are spaced apart and a vertical guide groove is formed between adjacent action parts. The mating part slides with the guide groove to restrict the linkage to move axially on the output shaft. The channel is provided with an annular step that limits the movement above the action parts. The action parts are opposite to the guide edge on the tensioning part. When the linkage is pressed, the action parts act on the guide edge to cause the tensioning part to move down and disengage from the mating part before rotating.

6. The anti-pinch knife locking structure for a multi-functional power tool according to claim 5, characterized in that, The lower surface of the functional part is an inclined surface that mates with the guide edge, and the lower surface of the mating part is an inclined surface that mates with the guide edge.

7. The anti-pinch knife locking structure for a multi-functional power tool according to claim 3, characterized in that, The groove depth of the spacing groove in the output shaft axial direction is greater than the groove depth of the tooth groove in the output shaft axial direction.

8. The anti-pinch knife locking structure for a multi-functional power tool according to claim 1, characterized in that, The cam is located at one end of the trigger. The end of the trigger with the cam is rotatably connected to the head shell through a connecting shaft. When the trigger is flipped upward, the cam presses down on the linkage. When the trigger is flipped downward, the linkage moves upward to reset. The head shell is provided with a locking element, which is used to lock the trigger rotation when it is in the flipped-over state.

9. The anti-pinch knife locking structure for a multi-functional power tool according to claim 1, characterized in that, The tensioning member is provided with a connecting hole, and the movable pressure plate is provided with a connecting rod inserted into the connecting hole. The connecting hole is provided with a locking surface, and the connecting rod is provided with a snap-fit ​​surface. The connecting rod inserted into the connecting hole has a release position and a snap-fit ​​position relative to the tensioning member. Rotating the connecting rod allows it to switch between the release position and the snap-fit ​​position. When the connecting rod is in the snap-fit ​​position, the snap-fit ​​surface is engaged above the locking surface to prevent the connecting rod from disengaging from the connecting hole along the axial direction of the output shaft. When the connecting rod is in the released position, the engaging surface and the locking surface are disengaged, and the connecting rod can disengage from the connecting hole along the axial direction of the output shaft downwards.

10. The anti-pinch knife locking structure for a multi-functional power tool according to claim 9, characterized in that, The locking surface is an inclined surface, which restricts the linkage from rotating from the engaged position to the released position.

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