Cutting device

Abstract

A cutting device comprises a shroud, a body, a driving mechanism, an output shaft and a cutting member. The body is provided with a switch, a trigger and a linkage. The linkage comprises a push rod rotating around a first axis, a depth linkage connected with the push rod, a shaft lock linkage rotating around a second axis and a shaft lock plate cooperating with the output shaft. The cutting device has a down-pressing locking state and a down-pressing unlocking state. The shaft lock plate has an output shaft unlocking position and an output shaft locking position. The trigger has a safe position and a use position. The shaft lock linkage is in driving connection with the push rod and the shaft lock plate. The shaft lock linkage in a first state before rotation satisfies that the cutting device is in the down-pressing locking state, the shaft lock plate is in the output shaft unlocking position and the trigger is in the safe position. The shaft lock linkage in a second state after rotation satisfies that the cutting device is in the down-pressing unlocking state, the shaft lock plate is in the output shaft locking position and the trigger is in the safe position. Thus, the operation is simple, both hands are free and the cutting member can be replaced more safely.

Description

[TECHNICAL FIELD]

[0001] The present application relates to the technical field of electric tools, in particular to a cutting device which is convenient to use and can safely replace a cutting piece. [BACKGROUND]

[0002] In the related art, a cutting device is provided, which needs to be pressed by hand to hold a lock shaft piece and the like when replacing a cutting piece, causing inconvenience in operation and affecting the safety when replacing the cutting piece. [SUMMARY]

[0003] The present application provides a cutting device to solve the problem of how to facilitate the replacement of a cutting piece to improve safety.

[0004] An embodiment of the present application provides a cutting device, which comprises a shroud, a machine body pivotally connected to the shroud, a driving mechanism arranged in the machine body, and a cutting piece connected to an output shaft of the driving mechanism. The machine body is provided with a switch electrically connected to the driving mechanism and a trigger or release switch.

[0005] The cutting device further comprises a linkage device arranged on the machine body, which comprises a push rod rotating about a first axis, a depth linkage rod in transmission connection with the push rod, a shaft lock linkage rod rotating about a second axis, and a shaft lock piece matched with the output shaft.

[0006] The cutting device has a downward locking state for preventing the machine body from being pressed downward relative to the shroud, and a downward unlocking state for allowing the machine body to be pressed downward relative to the shroud. The shroud is provided with a depth adjustment part. The push rod rotates to drive the depth linkage rod to abut against the depth adjustment part, so that the cutting device is in the downward locking state, or the push rod rotates to drive the depth linkage rod not to abut against the depth adjustment part, so that the cutting device is in the downward unlocking state.

[0007] The shaft lock piece has an output shaft unlocking position for allowing the output shaft to rotate, and an output shaft locking position for preventing the output shaft from rotating. The shaft lock piece moves and abuts against the output shaft to limit the rotation of the cutting piece.

[0008] The trigger has a safety position for preventing the switch from being triggered, and a use position for allowing the switch to be triggered.

[0009] At least a part of the shaft lock linkage rod is exposed to the machine body. The shaft lock linkage rod is in transmission connection with the push rod and the shaft lock piece respectively. The shaft lock linkage rod has a first state and a second state before and after rotation respectively. In the first state, the cutting device is in the downward locking state, the shaft lock piece is in the output shaft unlocking position, and the trigger is in the safety position. In the second state, the cutting device is in the downward unlocking state, the shaft lock piece is in the output shaft locking position, and the trigger is in the safety position.

[0010] The cutting device can realize multiple functions by rotating the shaft lock connecting rod when the cutting element needs to be replaced, including: allowing the depth connecting rod to enter the depth adjusting groove to switch the machine body to a downward unlocking state, locking the output shaft with the shaft lock piece, and preventing the trigger switch from being triggered. Therefore, the user does not need to press the shaft lock piece and other operations when replacing the cutting element, thereby freeing the user's hands, facilitating the operation of disassembling or installing the cutting element (such as loosening or tightening the fastener for locking the cutting element), and improving the safety of the cutting element replacement process.

[0011] In one of the embodiments, the shroud is provided with a limiting hole; the linkage device further includes a stop pin in transmission connection with the shaft lock connecting rod, the stop pin having opposite first and second ends, the first end being arranged in the machine body, and the second end extending into or out of the limiting hole; in the first state, the shaft lock connecting rod abuts against the first end to prevent the second end from extending into the limiting hole; in the second state, the shaft lock connecting rod is away from the first end to allow the second end to extend into the limiting hole.

[0012] In one of the embodiments, the shaft lock connecting rod and the stop pin are in transmission connection through a wedge structure; the linkage device further includes a stop pin return spring abutting between the machine body and the stop pin, the stop pin return spring applying an elastic force to the stop pin towards the limiting hole.

[0013] In one of the embodiments, the trigger is provided with a locking hole; the linkage device further includes a locking block in transmission connection with the shaft lock connecting rod, when the shaft lock connecting rod is rotated to the second state, the locking block is moved relative to the trigger under the driving of the shaft lock connecting rod to be clamped into the locking hole.

[0014] In one of the embodiments, the linkage device further includes a locking block return spring abutting between the machine body and the locking block to apply an elastic force to the locking block away from the trigger side.

[0015] In one of the embodiments, the depth connecting rod rotates around a third axis, one end of the depth connecting rod located at the third axis is connected with the push rod, and the other end of the depth connecting rod located at the third axis abuts against or is away from the depth adjusting part, the third axis is arranged non-parallel to the first axis.

[0016] In one of the embodiments, the shaft lock connecting rod includes first and second rotating arms respectively located on both sides of the second axis, and an operation part arranged on the second rotating arm; the first rotating arm is used for being in transmission connection with the push rod, the shaft lock piece and the trigger respectively; in the first state, the first and second rotating arms are respectively accommodated in the machine body, and the operation part is exposed out of the machine body; in the second state, the first rotating arm is located in the machine body, and the second rotating arm protrudes out of the machine body.

[0017] In one of the embodiments, an arc-shaped arc surface part is arranged at one end of the first rotating arm away from the second rotating arm, and the arc surface part is used for being in sliding connection with the shaft lock piece and the push rod respectively.

[0018] In one embodiment, the linkage device further includes a shaft locking plate return spring abutting between the fuselage and the shaft locking plate; one end of the shaft locking plate abuts the arc surface portion, and the other end of the shaft locking plate is provided with a locking hole; in a first state, the shaft locking plate return spring is compressed; in a second state, the shaft locking plate return spring is released to engage the locking hole and lock the output shaft.

[0019] In one embodiment, when the axis lock link is in the first state, the push rod can rotate about the first axis to put the trigger in the use position and drive the depth link to disengage from the depth adjustment part, or put the trigger in the safety position and drive the depth link to abut the depth adjustment part. [Brief Description of the Drawings]

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the structure of a cutting device in one embodiment of the present application.

[0022] Figure 2 for Figure 1 A schematic diagram of a portion of the structure of the cutting device in the illustrated embodiment in a pressed-down locked state.

[0023] Figure 3 for Figure 1 A schematic structural diagram of the cutting device in the illustrated embodiment in a pressed-down locked state from another perspective.

[0024] Figure 4 for Figure 1 A schematic diagram of the partial structure of the cutting device in the embodiment shown in the pressed-down unlocked state.

[0025] Figure 5 for Figure 1 A schematic diagram of the partial structure of the cutting device in the illustrated embodiment from another perspective in the pressed-down unlocked state.

[0026] Figure 6 for Figure 1 The schematic diagram of the partial structure of the cutting device in the illustrated embodiment when the shaft locking plate is in the output shaft unlocking position.

[0027] Figure 7 for Figure 1 The illustrated embodiment is a schematic diagram of a portion of the structure of the cutting device when the shaft locking piece is in the output shaft locking position, and the body is pressed down to the cutting piece replacement position.

[0028] Figure 8 Figure 1 is a schematic diagram of a cutting device in a first embodiment of the present application. Figure 1 Figure 2 is a schematic diagram of a cutting device in a first embodiment of the present application.

[0029] Figure 9 Figure 3 is a schematic diagram of a cutting device in a first embodiment of the present application. Figure 1 Figure 4 is a schematic diagram of a cutting device in a first embodiment of the present application.

[0030] Figure 10 Figure 5 is a schematic diagram of a cutting device in a first embodiment of the present application. Figure 1 Figure 6 is a schematic diagram of a cutting device in a first embodiment of the present application.

[0031] Figure 11 Figure 7 is a schematic diagram of a cutting device in a first embodiment of the present application. Figure 1 Figure 8 is a schematic diagram of a cutting device in a first embodiment of the present application.

[0032] Figure 12 Figure 9 is a schematic diagram of a cutting device in a first embodiment of the present application. Figure 1 Figure 10 is a schematic diagram of a cutting device in a first embodiment of the present application.

[0033] Figure 13 Figure 11 is a schematic diagram of a cutting device in a first embodiment of the present application. Figure 1 Figure 12 is a schematic diagram of a cutting device in a first embodiment of the present application.

[0034] Main component symbol explanation:

[0035] Shroud-10; cutting device-100; depth adjustment groove-11; first groove-111; second groove-112; limit hole-12; machine body-20; output shaft-30; cutting member-40; switch-50; trigger-60; trigger reset spring-600; locking hole-61; linkage-70; push rod-71; push rod reset spring-710; shaft lock link-72; first contact-721; first rotating arm-722; cambered surface-7221; second rotating arm-723; operating part-7231; shaft lock piece-73; shaft lock piece reset spring-730; first hole-731; second hole-732; depth link-74; stop pin-75; first end-751; second end-752; protruding part-753; inclined surface-7531; stop pin reset spring-76; locking block-77; locking block reset spring-78; first axis-a; second axis-b; third axis-c. [DETAILED DESCRIPTION]

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0037] It is to be understood that where an element such as a layer, region or substrate is described as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element such as a layer, region or substrate is described as being "connected" or "coupled" to another element, it can be directly connected to the other element or intervening elements can also be present. Where an element is described as being "positioned on" another element, it can be directly on the other element or intervening elements can also be present. Relative terms such as "on", "above", "upper", "lower", "horizontal", "vertical", "left", "right", and the like as used herein to describe the orientation of one element relative to another are intended to be illustrative only and are not intended to be limiting. The terms "first", "second", "third", etc. are used herein only to describe different instances of an element and do not imply a spatial or chronological order among the elements.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] Some embodiments of the application are described in detail. The following embodiments and features of the embodiments can be combined with each other, without conflict.

[0040] Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 2 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 3 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 4 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 5 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 6 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 7 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 8 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application; Figure 9 Structure diagram of cutting device 100 in an embodiment of the application; Figure 1 Structure diagram of cutting device 100 in an embodiment of the application;Figure 10 for Figure 1 A schematic diagram of the cutting device 100 in the illustrated embodiment when the shaft lock link 72 is in the first state; Figure 11 for Figure 1 The cutting device 100 in the illustrated embodiment is a schematic diagram when the shaft lock link 72 is in the second state.

[0041] See also Figure 1 and Figure 2 This embodiment provides a cutting device 100, shown in the form of a track saw. The cutting device 100 includes a guard 10, a body 20 pivotally connected to the guard 10, a drive mechanism (not shown) disposed within the body 20, and a cutting member 40 connected to an output shaft 30 of the drive mechanism. The body 20 includes a switch 50 electrically connected to the drive mechanism and a trigger 60 for activating or releasing the switch 50. A base plate (not shown) is also fixedly connected to the lower portion of the guard 10 for sliding on a track or a workpiece.

[0042] The cutting device 100 further includes a linkage device 70, which includes a push rod 71, an axis locking link 72, an axis locking plate 73 and a depth link 74. Figure 2 and Figure 3 As shown, a depth adjustment slot 11 is provided on the shield 10 , and a depth connecting rod 74 is transmission-connected to the push rod 71 .

[0043] The cutting device 100 has a push-down unlock state that allows the body 20 to be pushed down relative to the shield 10 , and a push-down lock state that prevents the body 20 from being pushed down relative to the shield 10 .

[0044] A depth adjustment groove 11 is provided on the side of the shield 10. The depth adjustment groove 11 includes a first groove 111 and a second groove 112 that are interconnected. The second groove 112 is a longer arc-shaped groove, and the first groove 111 is a shorter straight groove. The lower side wall of the first groove 111 is a depth adjustment portion for abutting and limiting the depth link 74. Specifically, Figure 2 and Figure 3 As shown, in the pressed-down locking state, the depth link 74 is located in the first groove 111 of the depth adjustment groove 11, and the depth link 74 abuts the depth adjustment portion. Figure 4 and Figure 5As shown, in the down-unlocked state, the depth link 74 is out of the first slot 111, i.e. the depth link 74 is disengaged from the depth adjustment part, and is located at the upper end of the second slot 112, so that the user can press down the body 20. The push rod 71 can rotate relative to the body 20 about the first axis a to drive the depth link 74 into the first slot 111 or out of the first slot 111, so as to switch between the down-unlocked state and the down-locked state. In another embodiment of the present application, the depth adjustment part can be a protrusion arranged on the side surface of the shroud 10. In another embodiment of the present application, since the second slot 112 is arranged for guiding the down-pressing of the body 20, the second slot 112 can be omitted and only the first slot 111 is arranged.

[0045] In some embodiments, as shown in Figure 2 and Figure 3 , the depth link 74 is capable of rotating about the third axis c to enter the first slot 111 or out of the first slot 111. The third axis c is arranged non-parallel to the first axis a. In another embodiment, the depth link 74 is integrally arranged at the end of the push rod 71, which can reduce the number of parts. Preferably, a push rod reset spring 710 for resetting is arranged on the side of the push rod 71 away from the trigger 60.

[0046] As shown in Figure 6 , the shaft lock plate 73 has an output shaft unlocked position allowing the output shaft 30 to rotate, and an output shaft locked position preventing the output shaft 30 from rotating (see Figure 7 ), and the shaft lock plate 73 is capable of moving relative to the body 20 to switch between the output shaft locked position and the output shaft unlocked position.

[0047] As shown in Figure 8 , the trigger 60 has a use position allowing the switch 50 to be triggered, and a safety position preventing the switch 50 from being triggered (see Figure 9 ).

[0048] As shown in Figure 10 and Figure 11 , the cutting device 100 in the first state of the shaft lock link 72 is shown in Figure 10 , and the cutting device 100 in the second state of the shaft lock link 72 is shown in Figure 11 . The first state is the initial state of the cutting device 100, and the second state is the state when the user replaces the cutting member 40. The shaft lock link 72 is drivingly connected to the push rod 71 and the shaft lock plate 73, and the shaft lock link 72 is capable of rotating about the second axis b to drive the push rod 71 to switch between the down-locked state and the down-unlocked state, and to drive the shaft lock plate 73 to switch between the output shaft unlocked position and the output shaft locked position. At least part of the shaft lock link 72 is exposed to the body 20.

[0049] When the shaft lock link 72 is in the first state, in combination with Figure 2 andFigure 3 As shown, the depth link 74 is located in the first groove 111, and the cutting device 100 is in a pressed and locked state, that is, the cutting depth of the cutting member 40 cannot be adjusted; Figure 6 As shown, the shaft lock piece 73 is in the output shaft unlocking position, thereby allowing the drive mechanism to start; Figure 8 As shown, the trigger 60 is in the use position, that is, the trigger 60 is not locked by the shaft lock link 72.

[0050] Please combine Figure 4 、 Figure 5 、 Figure 7 、 Figure 9 and Figure 11 When the cutting element 40 needs to be replaced, the locking link 72 is operated to rotate about the second axis b, switching the locking link 72 from the first state to the second state. At this time, the locking link 72 prevents the trigger 60 from triggering the switch 50, and the locking link 72 drives the push rod 71 to rotate, thereby driving the depth link 74 out of the first slot 111, switching the cutting device 100 to the downward unlocked state. This allows the body 20 to pivot relative to the shield 10, thereby driving the cutting element 40 to pivot to a position convenient for replacing the cutting element 40. Simultaneously, the locking link 72 also drives the locking plate 73 to rotate, switching the locking plate 73 to the output shaft locking position, thereby preventing the drive mechanism from being activated.

[0051] Therefore, when the cutting piece 40 needs to be replaced, multiple functions can be achieved by rotating the shaft lock link 72, namely, the body 20 is unlocked, the output shaft 30 is locked, and the trigger 60 is locked. Then, when replacing the cutting piece 40, the user does not need to press the shaft lock piece 73 and other operations, thereby truly freeing the user's hands and facilitating the removal or installation of the cutting piece 40 with both hands (such as loosening or tightening the fasteners that lock the cutting piece 40), thereby improving the safety of the cutting piece 40 replacement process.

[0052] Figure 12 for Figure 1 Schematic diagram of the assembly state of the stop pin 75 and the stop pin return spring 76 in the illustrated embodiment.

[0053] In some embodiments, as Figure 6 and Figure 7 As shown, the shield 10 is provided with a limit hole 12. The linkage device 70 also includes a stop pin 75, which is combined with Figure 12As shown, the stop pin 75 has a first end 751 opposite to a second end 752, the first end 751 is arranged in the machine body 20 and is drivingly connected to the shaft lock link 72, and the second end 752 is capable of extending into the limiting hole 12 to limit the machine body 20 relative to the shroud 10 at the cutting element replacement position in the depressed unlocked state, or the second end 752 is capable of being located outside the limiting hole 12 to allow the machine body 20 to be depressed relative to the shroud 10 in the depressed unlocked state. Among them, as shown in Figure 6 As shown, in the first state, the shaft lock link 72 abuts against the stop pin 75 to prevent the second end 752 from extending into the limiting hole 12. As shown in Figure 7 As shown, in the second state, the shaft lock link 72 is away from the stop pin 75 to allow the stop pin 75 to extend into the limiting hole 12.

[0054] Thus, in the first state, the stop pin 75 is limited by the shaft lock link 72 to prevent the stop pin 75 from falling into the limiting hole 12. When the shaft lock link 72 rotates and switches from the first state to the second state, the shaft lock link 72 switches the depth link 74 to the depressed unlocked state, and the shaft lock link 72 is away from the stop pin 75, thereby allowing the stop pin 75 to fall into the limiting hole 12. It should be noted that in the depressed unlocked state, and when the stop pin 75 is not pivoted with the machine body 20 to the position of the limiting hole 12, the stop pin 75 is located outside the limiting hole 12, at which time the machine body 20 can be operated relative to the shroud 10 to be pivoted to the cutting element replacement position. Specifically, when the machine body 20 is pivoted to the cutting element replacement position, the stop pin 75 is pivoted to the position of the limiting hole 12 under the driving of the machine body 20, at which time the stop pin 75 is capable of extending into the limiting hole 12 due to the fact that the stop pin 75 is not limited by the shaft lock link 72, thereby locking the machine body 20 relative to the shroud 10, thereby facilitating the replacement of the cutting element 40 at the cutting element replacement position. It should be noted that in the cutting element replacement position, the cutting element 40 can be detached from the machine body 20, and the cutting element 40 can be installed on the machine body 20.

[0055] In some embodiments, as shown in Figure 6 and Figure 7As shown, the linkage device 70 further comprises a stop pin reset spring 76 abutting between the machine body 20 and the stop pin 75 to apply an elastic force to the stop pin 75 towards the limiting hole 12. Thus, since the shaft lock link 72 is away from the stop pin 75 in the cutting element replacement mode, when the stop pin 75 is pivoted with the machine body 20 to the position of the limiting hole 12, the stop pin 75 is pushed by the elastic force of the stop pin reset spring 76 to fall into the limiting hole 12 and is elastically limited in the limiting hole 12 by the stop pin reset spring 76. When the shaft lock link 72 is switched from the second state to the first state, the shaft lock link 72 overcomes the elastic force of the stop pin reset spring 76 to lift the stop pin 75 away from the limiting hole 12, so that the stop pin 75 moves out of the limiting hole 12 to release the locking of the position of the machine body 20.

[0056] Figure 13 For Figure 1 the structure schematic diagram of the shaft lock link 72 in the embodiment.

[0057] In some embodiments, as shown in Figure 12 and Figure 13 , the shaft lock link 72 and the stop pin 75 are in transmission connection through a wedge structure to facilitate setting the direction of the stop pin 75 moving when the shaft lock link 72 rotates. Optionally, as shown in Figure 12 , the stop pin 75 is provided with a protruding part 753 having an inclined surface 7531, and as shown in Figure 13 , the shaft lock link 72 is provided with a first contact part 721 for wedge cooperation with the inclined surface 7531. The end of the stop pin reset spring 76 away from the machine body 20 (see Figure 7 ) abuts against the protruding part 753.

[0058] In some embodiments, as shown in Figure 8 and Figure 9 , the trigger 60 is provided with a locking hole 61. The linkage device 70 further comprises a locking block 77 in transmission connection with the shaft lock link 72, and the locking block 77 can be moved relative to the machine body 20 (see Figure 7 ) under the driving of the shaft lock link 72 when the shaft lock link 72 rotates around the second axis b, so as to be clamped into the locking hole 61 or away from the trigger 60, thereby switching between the safety position and the use position. Thus, the shaft lock link 72 unlocks or locks the trigger 60 through the locking block 77, thereby facilitating the simplification of the structure of the shaft lock link 72. In other embodiments, the shaft lock link 72 can be directly clamped into the locking hole 61 by setting a special-shaped structure, thereby not needing to set the locking block 77.

[0059] In some embodiments, as shown in Figure 8 and Figure 9As shown, the linkage 70 further comprises a lock block return spring 78 abutting between the body 20 (see Figure 7 ) and the lock block 77 to apply an elastic force to the lock block 77 towards the side away from the trigger 60. Thus, when the shaft lock link 72 is switched from the first state to the second state, the shaft lock link 72 pushes the lock block 77 to be clamped into the lock hole 61 against the elastic force of the lock block return spring 78. When the shaft lock link 72 is switched to the first state and away from the lock block 77, the lock block 77 is moved away from the trigger 60 under the elastic force of the lock block return spring 78, so that the trigger 60 is automatically switched to the use position.

[0060] Preferably, the trigger 60 is a rotating trigger, i.e. the trigger 60 is rotatable relative to the body 20, and the trigger 60 is reset by a trigger return spring 600. In other embodiments, the trigger 60 is a sliding trigger, i.e. the trigger 60 is movable relative to the body 20 to switch between the use position and the safety position.

[0061] In some embodiments, as shown in Figure 13 , the shaft lock link 72 comprises a first rotating arm 722 and a second rotating arm 723 located on both sides of the second axis b, and an operation portion 7231 provided on the second rotating arm 723. In combination with Figure 10 and Figure 11 , the first rotating arm 722 is used for transmission connection to the push rod 71, the shaft lock piece 73 and the trigger 60 respectively. In combination with Figure 1 , in the use position, the first rotating arm 722 and the second rotating arm 723 are respectively accommodated in the body 20, and the operation portion 7231 is exposed outside the body 20. In the safety position, the first rotating arm 722 is located in the body 20, and the second rotating arm 723 protrudes outside the body 20. Thus, when the cutting member 40 needs to be replaced, the operation portion 7231 is pushed towards the outside of the body 20 to drive the shaft lock link 72 to rotate, so as to facilitate operation and distinguish the first position and the second position of the shaft lock link 72. Alternatively, the first rotating arm 722 is transmission connected to the trigger 60 through the lock block 77.

[0062] In some embodiments, as shown in Figure 13 , an arc surface portion 7221 is provided on the end of the first rotating arm 722 away from the second rotating arm 723, and the arc surface portion 7221 is used for transmission connection to the push rod 71, the shaft lock piece 73 and the trigger 60 respectively. Thus, the arc surface portion 7221 is arranged to be in slidable contact with the push rod 71, the shaft lock piece 73 and the trigger 60 (or the lock block 77) respectively, so as to make the transmission more smooth when the first rotating arm 722 pushes the push rod 71, the shaft lock piece 73 or the trigger 60, and to facilitate reducing structural wear.

[0063] The linkage device 70 also includes a shaft locking plate return spring 730 that abuts between the body 20 and the shaft locking plate 73. One end of the shaft locking plate 73 abuts the curved surface portion 7221, and the other end of the shaft locking plate 73 defines a locking hole, or second hole 732. In a first state, the shaft locking plate return spring 730 is compressed. In a second state, the shaft locking plate return spring 730 is released, engaging the second hole 732 and locking the output shaft 30. Preferably, the shaft locking plate 73 is a stamped and bent metal sheet. The shaft locking plate 73 is provided with a larger first hole 731 and a smaller second hole 732. The second hole 732 is no smaller than the size of the output shaft 30 and is used to lock the output shaft 30. In another embodiment, the shaft locking plate 73 can also be configured as a locking pin that can be radially inserted into the output shaft 30.

[0064] In some embodiments, as Figure 6 As shown, when the axis lock link 72 is in the first state, the push rod 71 can be operated by the user to rotate about the first axis a, allowing the trigger 60 to freely trigger the switch 50, and the push rod 71 drives the depth link 74 out of the first slot. In other words, when the axis lock link 72 is in the first state, the push rod 71 can be used alone to lock or unlock the trigger 60; while when the axis lock link 72 is in the second state, the axis lock link 72 locks the trigger 60. Furthermore, in the first state, when the axis lock link 72 is not rotated, the push rod 71 can be pushed away from the trigger 60 to unlock the trigger 60 and the body 20, respectively. At this point, the trigger 60 can be operated to trigger the switch 50 and cut the workpiece.

[0065] The cutting device 100 proposed in the present invention can realize multiple functions at the same time by rotating the shaft locking link 72 when the cutting piece 40 needs to be replaced: the depth link 74 is disengaged from the depth adjustment part to switch the body 20 to the pressed-down unlocked state, and the shaft locking plate 73 locks the output shaft 30 and prevents the trigger 60 from triggering the switch; when replacing the cutting piece 40, the user only needs to rotate the shaft locking link 72 from the first state to the second state, and then press the body 20 down to a certain position, and then let go without pressing the shaft locking plate 73 and other operations, which truly frees the user's hands and facilitates the subsequent disassembly or installation of the cutting piece 40 with both hands (such as loosening or tightening the fasteners that lock the cutting piece), thereby improving the safety of the cutting piece 40 replacement process.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A cutting device comprising a shield, a body pivotally connected to the shield, a drive mechanism disposed within the body, and a cutting member connected to an output shaft of the drive mechanism, wherein the body is provided with a switch electrically connected to the drive mechanism and a trigger for activating or releasing the switch; Its characteristics are: The cutting device further comprises a linkage device provided on the body, the linkage device comprising a push rod rotating about a first axis, a depth connecting rod transmission-connected to the push rod, an axis locking connecting rod rotating about a second axis, and an axis locking plate cooperating with the output shaft; The cutting device has a downward-pressing unlocking state allowing the body to be pressed downward relative to the guard, and a downward-pressing locking state preventing the body from being pressed downward relative to the guard; the guard is provided with a depth adjustment portion; the push rod rotates to drive the depth connecting rod to abut against the depth adjustment portion, so that the cutting device is in the downward-pressing locking state, or the push rod rotates to drive the depth connecting rod not to abut against the depth adjustment portion, so that the cutting device is in the downward-pressing unlocking state; The shaft locking plate has an output shaft unlocking position for allowing the output shaft to rotate, and an output shaft locking position for preventing the output shaft from rotating; the shaft locking plate moves and abuts against the output shaft to restrict the rotation of the cutting member; The trigger has a use position that allows the switch to be actuated, and a safety position that prevents the switch from being actuated; At least a portion of the shaft lock link is exposed from the body, the shaft lock link is respectively connected to the push rod and the shaft lock plate, and the shaft lock link has a first state and a second state before and after rotation; in the first state, the following conditions are met simultaneously: the cutting device is in the pressed-down locking state, the shaft lock plate is in the output shaft unlocking position, and the trigger is in the safe position; In the second state, it is simultaneously satisfied that: the cutting device is in the pressed-down unlocking state, the shaft locking piece is in the output shaft locking position, and the trigger is in the safety position.

2. The cutting device according to claim 1, characterized in that: The protective cover is provided with a limiting hole; The linkage device further includes a stop pin in transmission connection with the shaft lock link, the stop pin having a first end and a second end opposite to each other, the first end being disposed in the fuselage, and the second end extending into or out of the limiting hole; In the first state, the shaft lock link abuts against the first end to prevent the second end from extending into the limiting hole; in the second state, the shaft lock link leaves the first end to allow the second end to extend into the limiting hole.

3. The cutting device according to claim 2, characterized in that: The shaft lock link and the stop pin are connected in transmission via an inclined wedge structure; the linkage device also includes a stop pin return spring that presses against the fuselage and the stop pin, and the stop pin return spring applies an elastic force to the stop pin toward the limiting hole.

4. The cutting device according to claim 1, characterized in that: The trigger is provided with a locking hole; The linkage device also includes a locking block that is transmission-connected to the shaft lock link. When the shaft lock link rotates to the second state, the locking block moves relative to the trigger driven by the shaft lock link to engage with the locking hole.

5. The cutting device according to claim 4, characterized in that: The linkage device further includes a locking block reset spring, which abuts between the body and the locking block to apply an elastic force to the locking block toward a side away from the trigger.

6. The cutting device according to claim 1, characterized in that: The depth link rotates around a third axis, one end of the depth link located on the third axis is connected to the push rod, and the other end of the depth link located on the third axis abuts or disengages from the depth adjustment portion, and the third axis is arranged non-parallel to the first axis.

7. The cutting device according to claim 1, characterized in that: The shaft lock link includes a first rotating arm and a second rotating arm located on both sides of the second axis, and an operating portion provided on the second rotating arm; the first rotating arm is used to be respectively connected to the push rod, the shaft lock plate and the trigger; In the first state, the first rotating arm and the second rotating arm are respectively accommodated in the body, and the operating portion is exposed from the body; in the second state, the first rotating arm is located in the body, and the second rotating arm protrudes from the body.

8. The cutting device according to claim 7, characterized in that: An arcuate surface is provided on one end of the first rotating arm away from the second rotating arm, and the arcuate surface is used for sliding connection to the shaft locking plate and the push rod respectively.

9. The cutting device according to claim 8, characterized in that: The linkage device also includes a shaft locking plate return spring abutting between the fuselage and the shaft locking plate; one end of the shaft locking plate abuts the arc surface portion, and the other end of the shaft locking plate is provided with a locking hole; in the first state, the shaft locking plate return spring is compressed; in the second state, the shaft locking plate return spring is released to engage the locking hole and lock the output shaft.

10. The cutting device according to claim 1, characterized in that: When the axis lock link is in the first state, the push rod can rotate around the first axis to place the trigger in the use position and drive the depth link to disengage from the depth adjustment part, or to place the trigger in the safety position and drive the depth link to abut against the depth adjustment part.

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