Blade assembly position locking device of cutter

Abstract

The utility model discloses a blade assembly position locking device of a cutter. More than three locking grooves are formed in a cutter handle at intervals. The sliding block is arranged in the cutter handle in a sliding mode. The blade assembly is rotatably mounted at the front end of the sliding block and is provided with more than two positioning grooves; the locking mechanism comprises a locking piece and an elastic reset piece, the locking piece can move between a locking position and an unlocking position, the elastic reset piece is used for providing elastic force for the locking piece, and when the locking piece is located at the locking position, the first positioning part is in positioning fit with the positioning groove so that the rotation angle of the blade assembly can be locked at the current angle position; meanwhile, the second positioning part is matched with the locking groove in a positioning mode so that the moving position of the blade assembly can be locked at the current moving position, the button is pressed to drive the locking piece to move to the unlocking position so that the positioning matching between the first positioning part and the positioning groove can be relieved, and meanwhile the positioning matching between the second positioning part and the locking groove can be relieved. The structure is simpler, and spare and accessory parts are fewer.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cutter, especially a blade assembly position locking device of cutter. BACKGROUND

[0002] Cutter is mainly divided into cutting knife for lateral cutting and scraper for scraping. Cutting knife is a kind of art and handicraft tool, generally the cutting edge of blade is parallel to the axis of handle or shell body, mainly used for cutting, such as cutting paper, paperboard and the like. Scraper generally has blade perpendicular to or orthogonal to the axis of handle, used for scraping, such as scraping paint, gum marks and the like from flat surface. Cutting knife and scraper are two separate hand tools, and often cannot be used universally, and generally need to be purchased, stored and carried, which brings inconvenience to users. With the development of cutter technology, technical personnel designs a deformable cutter with cutting knife function and scraper function, which can be seen from Chinese patent authorized publication No. CN117719008B. The blade assembly of the deformable cutter can be used as cutting knife in the first state (i.e. the blade assembly extends from the handle in the length direction of the handle), and can be used as scraper in the second state (i.e. the blade assembly is perpendicular to the length direction of the handle).

[0003] However, the locking device of the existing deformable cutter for locking the moving position of the blade assembly along the axis of the handle, the rotating position of the blade and the rotating angle of the blade assembly is relatively complex in structure, which is not conducive to the layout and assembly of the internal structure of the cutter, and therefore needs to be improved. SUMMARY

[0004] The utility model aims at providing a kind of blade assembly position locking device of cutter, the moving position and rotating position of blade assembly are synchronously locked by locking mechanism, and the moving position and rotating position of blade assembly are synchronously unlocked by single button, compared with prior art, structure is simpler and fewer spare parts.

[0005] The above technical purpose of the utility model is realized by the following technical scheme: a kind of blade assembly position locking device of cutter, comprising

[0006] Handle, handle is equipped with more than three locking grooves along the direction of handle axis is arranged at intervals;

[0007] Sliding block, sliding block is slidably arranged in handle along the direction of handle axis;

[0008] Blade assembly, blade assembly is rotatably installed in the front end of sliding block, and the blade holder of blade assembly is equipped with more than two positioning grooves;

[0009] The locking mechanism comprises a locking member and an elastic reset member. The locking member is movably installed in the slider. The locking member is provided with a first positioning part, a second positioning part and a button. The locking member can move between a locking position and an unlocking position. The elastic reset member provides elastic force for moving the locking member to the locking position, so that the locking member has a tendency to remain in the locking position. When the locking member is in the locking position, the first positioning part is in positioning cooperation with the positioning groove, so that the rotation angle of the blade assembly is locked. At the same time, the second positioning part is in positioning cooperation with the locking groove, so that the moving position of the blade assembly and the slider along the handle axis is locked. When the locking member is moved to the unlocking position by pressing the button, the first positioning part is out of positioning cooperation with the positioning groove, and at the same time, the second positioning part is also out of positioning cooperation with the locking groove.

[0010] Further, the slider has a mounting groove for accommodating the locking member. The locking member is telescopically arranged in the mounting groove. The elastic reset member is arranged between the end face of the mounting groove and the locking member. The locking member has a tendency to move to the locking position under the action of the elastic reset member. The locking member can be moved to the unlocking position by pressing the button against the elastic force of the elastic reset member.

[0011] Further, the first positioning part is arranged at the front end of the locking member. The blade assembly is rotatably installed at the front end of the slider through a pin shaft part. The positioning groove is arranged around the pin shaft part as the rotation axis. When the first positioning part is aligned and inserted into the positioning groove, the rotation angle of the blade assembly is locked at the current angle position.

[0012] Further, the button is arranged at the rear end of the locking member. The handle is provided with a sliding groove extending along the handle axis. The button is extended out of the handle through the sliding groove and can move along the sliding groove. The second positioning part is arranged at least on one side of the left and right sides of the button.

[0013] Further, the second positioning part is symmetrically arranged on both sides of the button. The locking groove is symmetrically arranged on both sides of the sliding groove for positioning cooperation with the second positioning part.

[0014] Further, the slider comprises a first block and a second block which are detachably connected as a whole. The mounting groove is arranged in the first block. The second block is arranged to provide a bypass channel for the button and the second positioning part to extend out of the mounting groove.

[0015] Further, the handle is provided with three or more locking grooves arranged along the handle axis at intervals.

[0016] Further, the locking groove comprises at least a first locking groove, a second locking groove and a third locking groove arranged in sequence from the front end of the shank to the tail end of the shank, the first locking groove, the second locking groove and the third locking groove are arranged in the shank at intervals, when the second positioning part is aligned and inserted into the third locking groove, the slider and the blade assembly are locked in the shank, when the second positioning part is aligned and inserted into the second locking groove, the slider and the blade assembly are locked in the first position of the shank, when the second positioning part is aligned and inserted into the first locking groove, the slider and the blade assembly are locked in the second position of the shank.

[0017] Further, the positioning groove comprises at least a first positioning groove and a second positioning groove, the first positioning groove is arranged at 90° with the center angle of the second positioning groove, when the first positioning part is aligned and inserted into the first positioning groove, the blade assembly is locked in the angle along the axial direction of the shank, when the first positioning part is aligned and inserted into the second positioning groove, the blade assembly is locked in the angle along the direction perpendicular to the axial direction of the shank.

[0018] In conclusion, the utility model has the following beneficial effects:

[0019] The blade assembly position locking device has the advantages that the locking mechanism is used for synchronously locking the moving position and the rotating position of the blade assembly, and a single button is used for synchronously unlocking the moving position and the rotating position of the blade assembly, so that the structure is simpler and the parts are fewer compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a structure schematic view of the blade assembly in the blade retracted position of the utility model.

[0021] Figure 2 Fig. 2 is a structure schematic view of the blade assembly in the blade cutting position of the utility model.

[0022] Figure 3 Fig. 3 is a structure schematic view of the blade assembly in the blade switching position of the utility model.

[0023] Figure 4 Fig. 4 is an exploded view of the cutting tool of the utility model.

[0024] Figure 5 Fig. 5 is a structure schematic view of the rack part and the gear part of the utility model.

[0025] Figure 6 Fig. 6 is an installation structure schematic view of the slider and the blade assembly of the utility model.

[0026] Figure 7 Fig. 7 is a split structure schematic view of the slider and the blade assembly of the utility model.

[0027] Figure 8It is the structure schematic view of the blade assembly of the utility model.

[0028] Figure 9 It is the internal section view of the sliding block of the utility model.

[0029] Figure 10 It is the split structure schematic view of the locking mechanism and the sliding block of the utility model.

[0030] In the figure: 10, handle; 11, locking groove; 111, first locking groove; 112, second locking groove; 113, third locking groove; 12, sliding groove; 13, rack part; 14, avoiding mouth; 15, additional locking groove A; 16, additional positioning groove B; 17, guide rail; 20, sliding block; 21, first block; 211, mounting groove; 22, second block; 221, avoiding passage; 23, mounting hole; 30, blade assembly; 31, tool rest; 311, positioning groove; 3111, first positioning groove; 3112, second positioning groove; 312, pin shaft part; 313, gear part; 32, blade; 40, locking mechanism; 41, locking piece; 411, first positioning part; 412, second positioning part; 413, button; 42, elastic reset piece. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with the drawings.

[0032] In the description of the utility model, it needs to be explained that for the orientation words, such as the terms“center”,“transverse”,“longitudinal”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer” and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and it is only for the convenience of narrating the utility model and simplifying the description, and it does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the utility model. It needs to be explained that the terms“first”,“second” and the like in the specification and claims of the present application are used to distinguish similar objects, and do not have to be used to describe a particular order or sequence. It needs to be understood that the front end in the present application refers to the opening side of the handle 10, and the rear end refers to the side away from the opening side of the handle 10.

[0033] As Figures 1-10As shown, a tool blade assembly position locking device of a tool includes a tool holder 10, a sliding block 20, a tool blade assembly 30 and a locking mechanism 40, the tool holder 10 is provided with a front-end open accommodating cavity, the accommodating cavity is arranged along the axial direction of the tool holder 10, the sliding block 20 is slidably arranged in the accommodating cavity, that is, the sliding block 20 is slidably arranged in the tool holder 10 along the axial direction of the tool holder 10, the tool holder 10 is provided with a guide rail 17 for guiding the sliding block 20 to move along the axial direction of the tool holder 10, the tool blade assembly 30 is rotatably installed at the front end of the sliding block 20, and the tool blade assembly 30 includes a tool holder 31 and a tool blade 32 fixedly installed on the tool holder 31.

[0034] The tool holder 10 is provided with a plurality of locking grooves 11 arranged along the axial direction of the tool holder 10, and the tool holder 31 of the tool blade assembly 30 is provided with two or more positioning grooves 311; the locking mechanism 40 includes a locking piece 41 and an elastic reset piece 42, the locking piece 41 is movably installed in the sliding block 20, the locking piece 41 is provided with a first positioning portion 411, a second positioning portion 412 and a button 413, the first positioning portion 411 is positioned and matched with the positioning groove 311 to limit the rotational position of the tool blade assembly 30, the second positioning portion 412 is positioned and matched with the locking groove 11 to limit the moving position of the sliding block 20 and the tool blade assembly 30 along the axial direction of the tool holder 10, the locking piece 41 can move between a locking position and an unlocking position, and the elastic reset piece 42 is used to provide the elastic force of the locking piece 41 moving to the locking position direction to make the locking piece 41 have the tendency to keep in the locking position.

[0035] When the locking piece 41 is in the locking position, the first positioning portion 411 is positioned and matched with the positioning groove 311 to lock the rotation angle of the tool blade assembly 30 at the current angle position, and the second positioning portion 412 is positioned and matched with the locking groove 11 to lock the moving position of the tool blade assembly 30 and the sliding block 20 at the current moving position, by pressing the button 413 to drive the locking piece 41 to move to the unlocking position, the first positioning portion 411 is disengaged from the positioning and matching with the positioning groove 311, and the second positioning portion 412 is disengaged from the positioning and matching with the locking groove 11, at this time, by moving the button 413 towards the front end of the tool holder 10, the sliding block 20 and the tool blade assembly 30 installed on the sliding block 20 can be driven to move in the extending direction, that is, the front end direction of the tool holder 10, and the tool blade assembly 30 can adjust the switching angle of the tool blade assembly 30 by means of the angle rotating structure.

[0036] In some embodiments, the sliding block 20 has a mounting groove 211 accommodating the locking member 41, the locking member 41 is telescopically arranged in the mounting groove 211, the elastic reset member 42 is arranged between the end face of the mounting groove 211 and the locking member 41, the locking member 41 has a tendency to move to the locking position under the action of the elastic reset member 42, the locking member 41 can be moved to the unlocking position by pressing the button 413 against the elastic force of the elastic reset member 42, in this embodiment, the telescopic direction of the locking member 41 is perpendicular to the axis direction of the shank 10, specifically, the shape of the mounting groove 211 is preferably adapted to the shape of the locking member 41, so that the groove wall of the mounting groove 211 can limit and guide the telescopic movement of the locking member 41, so that the locking member 41 can be more smoothly telescoped in the mounting groove 211 when the button 413 is pressed, and the locking member 41 can be smoothly and smoothly reset under the action of the elastic reset member 42 when the pressing force on the button 413 is removed, avoiding the problem of deviation.

[0037] In some embodiments, the first positioning part 411 is arranged at the front end of the locking member 41, the blade assembly 30 is rotatably mounted at the front end of the sliding block 20 through the pin shaft part 312, specifically, the front end of the locking member 41 is a bottom plate structure, the front end of the bottom is provided with a mounting hole 23, the pin shaft part 312 is arranged on the blade holder 31 of the blade assembly 30, the pin shaft part 312 of the blade assembly 30 is rotatably mounted in the mounting hole 23, the positioning groove 311 is distributed with the pin shaft part 312 as the rotation axis, when the first positioning part 411 is aligned and inserted into the positioning groove 311, the rotation angle of the blade assembly 30 is locked at the current angle position.

[0038] In some embodiments, the button 413 is arranged at the rear end of the locking member 41, the shank 10 is provided with a sliding groove 12 extending along the axis direction of the shank 10, the button 413 is extended out of the shank 10 through the sliding groove 12 and can move along the sliding groove 12, the second positioning part 412 is arranged at least one side of the left and right sides of the button 413.

[0039] In some embodiments, the second positioning part 412 is symmetrically arranged on both sides of the button 413, the locking groove 11 is symmetrically arranged on both sides of the sliding groove 12 for positioning and matching with the second positioning part 412, by arranging two groups of second positioning parts 412 and the locking grooves 11 matched with the second positioning parts 412, the moving position of the sliding block 20 can be more stably and firmly locked.

[0040] In some embodiments, the slider 20 comprises a first block 21 and a second block 22 connected as a whole in a detachable manner, a mounting groove 211 is arranged in the first block 21, the second block 22 is arranged to provide an avoiding passage 221 for the button 413 and the second positioning part 412 to extend out of the mounting groove 211, in the present embodiment, the first block 21 and the second block 22 are connected by fasteners, by designing the slider 20 in a split manner, the locking member 41 and the elastic reset member 42 are facilitated to be assembled.

[0041] In some embodiments, the shank 10 is provided with three or more locking grooves 11 arranged in the axial direction of the shank 10, specifically, the locking grooves 11 comprise a first locking groove 111, a second locking groove 112 and a third locking groove 113 arranged in the direction from the front end of the shank 10 to the tail end of the shank 10, the first locking groove 111, the second locking groove 112 and the third locking groove 113 are arranged in the shank 10 in a spaced manner, when the second positioning part 412 is aligned and inserted into the third locking groove 113, the slider 20 and the blade assembly 30 are locked in the shank 10, at this time, the blade assembly 30 is located at the blade retracted position, when the second positioning part 412 is aligned and inserted into the second locking groove 112, the slider 20 and the blade assembly 30 are locked at the first position of the shank 10, the first position is the blade cutting position, at the blade cutting position, the blade assembly 30 is partially extended out of the shank 10, at this time, the tool is used as a cutting knife, when the second positioning part 412 is aligned and inserted into the first locking groove 111, the slider 20 and the blade assembly 30 are locked at the second position of the shank 10, the second position is the blade switching position. That is, when the second positioning part 412 is inserted into the third locking groove 113, the blade assembly 30 is locked in the shank 10, at this time, the blade assembly 30 is in the storage state, when the second positioning part 412 is inserted into the second locking groove 112, the blade assembly 30 is locked at the second position, that is, the blade 32 is at least partially extended out of the shank 10, the blade assembly 30 is arranged in the axial direction of the shank 10, at this time, the blade assembly 30 can be used as a cutting knife, when the second positioning part 412 is inserted into the first locking groove 111, the blade assembly 30 is locked at the second position, that is, the blade 32 is completely extended out of the shank 10, the blade assembly 30 is arranged in the direction perpendicular to the axial direction of the shank 10, at this time, the blade assembly 30 can be used as a scraper for scraping paint, glue marks and the like.

[0042] Of course, additional locking grooves A15 and additional positioning grooves B16 can also be provided in the shank 10 in the present application, wherein the additional locking grooves A15 are provided between the second locking groove 112 and the third locking groove 113, and the additional positioning grooves B16 are provided between the second locking groove 112 and the first locking groove 111, when the second positioning part 412 is locked in the additional locking groove A15, the blade 32 partially extends out of the shank 10 and the length of the blade 32 extending out of the shank 10 is less than the length when the second positioning part 412 is inserted into the second locking groove 112, at this time, the tool is also used as a cutting knife, only the length of the blade 32 extending out of the shank 10 is shortened compared to the position of the second locking groove 112, when the second positioning part 412 is locked in the additional locking groove B16, the blade 32 extends out of the shank 10 and the included angle between the blade 32 and the axis of the shank 10 is between 0°-90°, for example, 45°, at this time, the tool is also used as a cutting knife, only the angle of the blade 32 is changed.

[0043] In some embodiments, the positioning groove 311 comprises at least a first positioning groove 3111 and a second positioning groove 3112, the first positioning groove 3111 is arranged at an angle of 90° with the center angle of the second positioning groove 3112, when the first positioning part 411 is aligned and inserted into the first positioning groove 3111, the blade assembly 30 is locked at an angle along the axis direction of the shank 10, when the first positioning part 411 is aligned and inserted into the second positioning groove 3112, the blade assembly 30 is locked at an angle along the direction perpendicular to the axis of the shank 10.

[0044] The angle rotating structure comprises a rack part 13 provided at the front end inside the shank 10, the rack part 13 is arranged along the axis direction of the shank 10, the side wall of the holder 31 of the blade assembly 30 is provided with a gear part 313, the center of the gear part is coaxially arranged with the center of the pin shaft part 312, in the present application, the gear part 313 is a sector gear, the central angle thereof is 90 degrees, the front end side of the shank 10 is provided with a avoiding opening 14, the avoiding opening 14 is used to provide space for the angle switching of the blade assembly 30.

[0045] The button 413 includes at least two stages during pushing from the tail end of the sliding groove 12 to the front end of the sliding groove 12: the first stage, the blade assembly 30 moves from the blade retracted position to the blade cutting position, the cutter switches from the storage state to the cutting knife state, at this time, the button 413 is released, the first positioning part 411 is locked and matched with the first positioning groove 3111, and the second positioning part 412 is locked and matched with the second locking groove 112, so that the blade assembly 30 and the sliding block 20 are locked in the cutting knife state, at this time, the cutter is used as the cutting knife, in the stage, the gear part 313 is not in contact with the rack part 13, the second stage, the button 413 is continuously pushed forward, so that the blade assembly 30 moves from the blade cutting position to the blade switching position, the blade assembly 30 of the cutter switches from the cutting knife state to the scraper state, in the stage, the gear part 313 starts to be in contact with and meshed with the rack part 13, so that the blade assembly 30 rotates ° around the pin shaft part 312, so that the blade assembly 30 is arranged perpendicularly to the axis of the blade handle 10, the second positioning part 412 is positioned and matched with the first locking groove 111, so that the blade assembly 30 and the sliding block 20 are locked in the blade 32 switching position, and the first positioning part 411 is positioned and matched with the second positioning groove 3112, so that the blade assembly 30 is locked in the position perpendicular to the axis of the blade handle 10, at this time, the cutter is used as the scraper.

[0046] In the utility model, the locking piece 41 is a strip structure, the first positioning part 411 is arranged at the front end of the locking piece 41, the second positioning part 412 is arranged at the rear end of the locking piece 41, and the second positioning part 412 is provided with two groups and is symmetrically arranged at the left and right sides of the button 413. The inner end of the locking piece 41 is provided with a guide groove for limiting the elastic reset piece 42, the elastic reset piece 42 is at least partially arranged in the guide groove, and the elastic reset piece 42 is preferably a spring. When the locking piece 41 moves to the locking position, the first positioning part 411 and the second positioning part 412 are both in the locking state, and when the locking piece 41 moves to the unlocking position, the first positioning part 411 and the second positioning part 412 are both in the unlocking state.

[0047] To sum up, the utility model has the following beneficial effects:

[0048] The blade assembly position locking device of the utility model synchronously locks the moving position and the rotating position of the blade assembly 30 through the locking mechanism 40, and synchronously unlocks the moving position and the rotating position of the blade assembly 30 through the single button 413, and compared with the prior art, the structure is simpler and the parts are fewer.

[0049] The above only describes the preferred implementation manner of the utility model, therefore, equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application range are included in the utility model patent application range.

Claims

1. A blade assembly position locking device for a cutting tool, characterized by: include The tool holder (10) has multiple locking grooves (11) spaced apart along the axis of the tool holder (10); The slider (20) is slidably disposed inside the tool holder (10) along the axis of the tool holder (10); The blade assembly (30) is rotatably mounted on the front end of the slider (20), and the blade holder (31) of the blade assembly (30) is provided with two or more positioning slots (311); The locking mechanism (40) includes a locking member (41) and a resilient reset member (42). The locking member (41) is movably mounted in the slider (20). The locking member (41) is provided with a first positioning part (411), a second positioning part (412), and a button (413). The locking member (41) is movable between a locked position and an unlocked position. The resilient reset member (42) is used to provide a spring force for the locking member (41) to move in the locking position so that the locking member (41) tends to remain in the locked position. When the position is fixed, the first positioning part (411) and the positioning groove (311) are positioned and engaged to lock the rotation angle of the blade assembly (30). At the same time, the second positioning part (412) and the locking groove (11) are positioned and engaged to lock the movement position of the blade assembly (30) and the slider (20) along the axis of the handle (10). When the locking member (41) is moved to the unlock position by pressing the button, the first positioning part (411) and the positioning groove (311) are released from the positioning engagement, and the second positioning part (412) and the locking groove (11) are also released from the positioning engagement.

2. A blade assembly position locking device for a cutting tool according to claim 1, characterized in that: The slider (20) has a mounting groove (211) for accommodating the locking member (41). The locking member (41) is telescopically disposed in the mounting groove (211). The elastic reset member (42) abuts against the inner end face of the mounting groove (211) and the locking member (41). Under the action of the elastic reset member (42), the locking member (41) tends to move towards the locked position. By pressing the button (413), the locking member (41) can overcome the elastic force of the elastic reset member (42) and move to the unlocked position.

3. A blade assembly position locking device for a cutting tool according to claim 1, characterized in that: The first positioning part (411) is disposed at the front end of the locking member (41). The blade assembly (30) is rotatably mounted at the front end of the slider (20) via the pin part (312). The positioning groove (311) is distributed with the pin part (312) as the rotation axis. When the first positioning part (411) is aligned and inserted into the positioning groove (311), the rotation angle of the blade assembly (30) is locked at the current angle position.

4. A blade assembly position locking device for a cutting tool according to claim 1, characterized in that: The button (413) is located at the rear end of the locking member (41). The tool holder (10) is provided with a slide groove (12) extending along the axis of the tool holder (10). The button (413) extends out of the tool holder (10) through the slide groove (12) and can move along the slide groove (12). The second positioning part (412) is located on at least one side of the left and right sides of the button (413).

5. A blade assembly position locking device for a cutting tool according to claim 4, characterized in that: The second positioning part (412) is symmetrically arranged on both sides of the button (413), and the locking slot (11) is symmetrically arranged on both sides of the sliding slot (12) for positioning and matching with the second positioning part (412).

6. A blade assembly position locking device for a cutting tool according to claim 1, characterized in that: The sliding block (20) comprises a first block (21) and a second block (22) which are detachably connected as a whole, the mounting slot (211) is arranged in the first block (21), and the second block (22) is arranged with the avoiding channel (221) for the button (413) and the second positioning part (412) to extend out of the mounting slot (211).

7. A blade assembly position locking device for a cutting tool according to any one of claims 1-6, characterized in that: The knife handle (10) is provided with three or more locking slots (11) which are arranged at intervals along the axial direction of the knife handle (10).

8. A blade assembly position locking device for a cutting tool according to claim 7, characterized in that: The locking slot (11) comprises at least a first locking slot (111), a second locking slot (112) and a third locking slot (113) which are arranged in sequence from the front end of the knife handle (10) to the tail end of the knife handle (10), the first locking slot (111), the second locking slot (112) and the third locking slot (113) are arranged at intervals in the knife handle (10), when the second positioning part (412) is aligned and inserted into the third locking slot (113), the sliding block (20) and the blade assembly (30) are locked in the knife handle (10), when the second positioning part (412) is aligned and inserted into the second locking slot (112), the sliding block (20) and the blade assembly (30) are locked in the first position extending out of the knife handle (10), and when the second positioning part (412) is aligned and inserted into the first locking slot (111), the sliding block (20) and the blade assembly (30) are locked in the second position extending out of the knife handle (10).

9. A blade assembly position locking device for a cutting tool according to claim 8, characterized in that: The positioning slot (311) comprises at least a first positioning slot (3111) and a second positioning slot (3112), the first positioning slot (3111) is arranged at an angle of 90° with the center angle of the second positioning slot (3112), when the first positioning part (411) is aligned and inserted into the first positioning slot (3111), the blade assembly (30) is locked at an angle along the axial direction of the knife handle (10), and when the first positioning part (411) is aligned and inserted into the second positioning slot (3112), the blade assembly (30) is locked at an angle along the direction perpendicular to the axial direction of the knife handle (10).

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