Cutter with replaceable cutting edge

Abstract

The utility model relates to the technical field of cutters, in particular to a cutter with a replaceable cutting edge, which is mainly used for solving the technical problems that the existing cutter wastes materials and is poor in functionality. The cutter with the replaceable blade comprises a cutter body, a movable blade and a positioning strip, a strip-shaped groove is formed in the bottom of the cutter body, a positioning pin is fixed in the strip-shaped groove, an embedding groove and a locking groove are formed in the top of the movable blade, and the embedding groove comprises a transverse groove and a vertical groove. The movable cutting edge of the structure is detachably installed on the knife body, on one hand, the cutting edge can be replaced when the cutting edge is damaged, structures of parts such as the knife body can still be used, material waste is avoided, on the other hand, the knife can be suitable for different scenes by replacing cutting edges with different functions, and functionality is high; in addition, the movable blade and the knife body are assembled through the caulking groove, the positioning pin, the positioning strip and other structures, fixation is firm, and assembly and disassembly are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of cutters, in particular to a cutter with a replaceable blade. Background Art

[0002] Knives include kitchen knives, carpenter knives, manual knives, etc., which are mainly used to cut various items.

[0003] The blade of existing knives is generally designed as an integral forged knife or a clamped steel knife, which has the following defects: first, when the blade is damaged such as curling or notching, it cannot be used normally or repaired, and a new knife needs to be replaced, but the structure of the blade body and other parts remains intact, thus resulting in a waste of materials; second, the structural characteristics of the knife result in it having only one function. For example, a kitchen knife is only suitable for cutting vegetables, but not for chopping bones. It can only be used in specific scenarios and has poor functionality. Utility Model Content

[0004] In order to overcome the technical defects of the existing cutting tools such as waste of materials and poor functionality, the utility model provides a cutting tool with a replaceable blade.

[0005] The utility model provides a knife with replaceable blade, comprising:

[0006] The blade body has a strip groove on its bottom surface, and two ends of the strip groove extend to two ends of the blade body in the blade length direction respectively. At least two positioning pins are fixed in the strip groove, and the positioning pins are perpendicular to the blade surface;

[0007] The movable blade has at least two embedding grooves at the top corresponding to the positioning pin, the embedding grooves include a vertical groove and a horizontal groove, the top of the vertical groove extends to the top of the movable blade, and the bottom extends to one side to form the horizontal groove, the groove width of the embedding groove is adapted to the positioning pin, and the top of the movable blade is also provided with a locking groove;

[0008] A positioning strip is inserted into the blade body along a vertical sliding motion. When the positioning pin is placed in the transverse groove, the positioning strip is aligned with the locking groove. A first elastic member is also connected between the positioning strip and the blade body. The first elastic member drives the positioning strip to be inserted into the locking groove. The top of the positioning strip is exposed from the blade body.

[0009] Optionally, the blade body includes a mounting plate and two clamping plates respectively arranged on both sides of the mounting plate, the bottoms of the two clamping plates extend below the mounting plate to form the strip groove, and the mounting plate is provided with an empty area for accommodating the positioning strip and the first elastic member.

[0010] Optionally, the knife with replaceable blade further comprises a handle, wherein the handle is fixedly connected to the rear side of the blade body;

[0011] The knife handle includes a rotating knife handle and a telescopic knife handle;

[0012] One end of the rotating knife handle is hinged on the blade body and a first embedding groove adapted to the movable blade is provided at the bottom. The rotating knife handle has a handle state in which it is unfolded at the rear side of the blade body and a folded state in which the first embedding groove is wrapped around the outer side of the movable blade. A first locking piece is provided between the rotating knife handle and the blade body to achieve relative fixation between the rotating knife handle and the blade body when the rotating knife handle is in the handle state.

[0013] The telescopic knife handle is slidably sleeved on the rotating knife handle and has a second embedding groove adapted to the movable blade at the bottom. The telescopic knife handle has at least a first gear and a second gear by sliding. When the telescopic knife handle is in the first gear, it is used as a knife handle together with the rotating knife handle in the knife handle state. When the telescopic knife handle is in the second gear, it is used together with the rotating knife handle in the folded state to wrap the movable blade. A second locking piece is provided between the telescopic knife handle and the rotating knife handle for achieving relative fixation of the two when the telescopic knife handle is in the two gears.

[0014] Optionally, the rotating knife handle and the telescopic knife handle are both inverted U-shaped frame structures, the telescopic knife handle is slidably sleeved on the outside of the rotating knife handle, the bottom opening of the rotating knife handle forms the first embedding groove, and the bottom opening of the telescopic knife handle forms the second embedding groove.

[0015] Optionally, a notch is provided at the top of the rotating knife handle, and a slot is provided at the top of the rear end of the blade body, the first locking member includes a first lever and a second elastic member, the fulcrum of the first lever is connected inside the rotating knife handle, a block is provided at the bottom of the front end of the first lever, and the block cooperates with the slot to achieve relative fixation of the rotating knife handle and the blade body, the rear end of the first lever is connected to the rotating knife handle through the second elastic member, and the second elastic member is used to drive the rear end of the first lever to move upward, and the rear end of the first lever is exposed to the rotating knife handle through the notch.

[0016] Optionally, the rotating knife handle is provided with two positioning holes spaced apart in the front-to-back direction, the second locking piece includes a second lever and a third elastic piece, the fulcrum of the second lever is connected to the outside of the telescopic knife handle, the front end of the second lever is exposed from the telescopic knife handle, the rear end of the second lever is provided with a positioning block passing through the telescopic knife handle, and the third elastic piece is connected between the second lever and the telescopic knife handle and is used to drive the positioning block to be inserted into the positioning hole.

[0017] Optionally, a limiting structure is further provided between the rotating tool handle and the telescopic tool handle, the limiting structure comprising an elastic limiting pin, the elastic limiting pin being installed on the rotating tool handle, the elastic limiting pin having a limiting state protruding from the outer side of the rotating tool handle and an avoiding state retracted from the inner side of the rotating tool handle, and the elastic limiting pin remains in the limiting state in the free state, the telescopic tool handle is provided with a limiting hole adapted for the elastic limiting pin, and the telescopic tool handle can slide to align the elastic limiting pin and insert it into the limiting hole to achieve overextension limiting.

[0018] Optionally, the limiting hole is a strip hole arranged along the front-to-back direction, and a blocking piece is protruding from the outer wall of the telescopic knife handle, and the blocking piece covers the rear part of the strip hole and is used to guide the elastic limiting pin to be gradually compressed inward.

[0019] Optionally, the hilt further comprises a protective plate, wherein two protective plates are provided and respectively fixed on the outer sides of the two wings of the telescopic hilt, and the limiting structure further comprises an elastic pressing pin, wherein the elastic pressing pin is arranged on the protective plate corresponding to the limiting hole and corresponding to the front part of the strip hole, and the elastic pressing pin is exposed on the protective plate, and the elastic pressing pin is used to realize the switching of the elastic limiting pin between the limiting state and the avoidance state by pressing.

[0020] Optionally, an end cover is provided at the rear end of the telescopic handle, and a limiting support block is provided on the front side of the end cover for limiting the movable blade when the handle is folded.

[0021] Compared with the prior art, the technical solution provided by the utility model has the following advantages:

[0022] The utility model provides a knife with replaceable blades, comprising a blade body, a movable blade and a positioning strip, wherein a strip groove is provided at the bottom of the blade body, a positioning pin is fixed in the strip groove, an embedding groove and a locking groove are provided at the top of the movable blade, and the embedding groove comprises a transverse groove and a vertical groove. When installing, the movable blade is first placed below the blade body and the vertical groove is aligned with the positioning pin, then the movable blade is pushed upward so that the positioning pin is against the bottom of the vertical groove, then the positioning strip is lifted upward, and at the same time, the movable blade is moved in the opposite direction of the extension direction of the transverse groove so that the positioning pin is placed in the transverse groove, and finally the positioning strip is released so that the positioning strip is inserted into the locking groove. The positioning strip cooperates with the locking groove to realize the horizontal limit of the movable blade, and the positioning pin cooperates with the transverse groove to realize the vertical limit of the movable blade, so that the movable blade and the blade body are relatively fixed. The movable blade of the structure can be detachably mounted on the blade body. On the one hand, when the blade is damaged, the blade can be replaced, and the structures of the blade body and other parts can still be used, thus avoiding waste of materials. On the other hand, the blades with different functions can be replaced to make it suitable for different scenes, and the functionality is strong. In addition, the movable blade and the blade body are assembled by means of structures such as embedded grooves, positioning pins and positioning strips, which are firmly fixed and easy to assemble and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram showing a front view of a tool in an embodiment of the utility model;

[0026] Figure 2 An assembly diagram showing a blade body and a movable blade in an embodiment of the utility model;

[0027] Figure 3 express Figure 2 Cross-section at AA in the middle;

[0028] Figure 4 A schematic diagram showing the structure of the movable blade in the embodiment of the utility model;

[0029] Figure 5 express Figure 4 Side view of

[0030] Figure 6A schematic diagram showing the internal structure of the blade body in an embodiment of the present utility model;

[0031] Figure 7 A schematic top view of a tool in an embodiment of the utility model is shown;

[0032] Figure 8 A schematic diagram showing the structure of the embodiment of the utility model when the rotating knife handle is in the knife handle state and the telescopic knife handle is in the second gear position;

[0033] Fig. 9 A schematic diagram showing the structure of the rotary knife handle in the embodiment of the utility model when it is in a folded state;

[0034] Fig.10 A schematic diagram showing the internal structure of the rotary knife handle in an embodiment of the utility model;

[0035] Fig.11 A schematic diagram showing the appearance of a rotary knife handle in an embodiment of the utility model;

[0036] Fig.12 A schematic diagram showing the top view of the telescopic knife handle in an embodiment of the utility model;

[0037] Fig.13 A top cross-sectional view of a rotary tool handle according to an embodiment of the present utility model is shown;

[0038] Fig.14 A schematic diagram showing the coordination of the rotating knife handle, the elastic limiting pin and the blocking piece in the embodiment of the utility model;

[0039] Fig.15 express Fig.14 Cross-section at the middle BB;

[0040] Fig.16 A schematic diagram showing the structure of the end cover in an embodiment of the utility model is shown.

[0041] In the figure:

[0042] 1. Blade body; 11. Positioning pin; 12. Mounting plate; 121. Empty area; 13. Clamp; 14. Slot; 2. Movable blade; 21. Embedded slot; 211. Vertical slot; 212. Horizontal slot; 22. Locking slot; 22. Connecting plate; 23. Conical blade; 3. Positioning strip; 31. First elastic member; 4. Knife handle; 41. Rotating knife handle; 411. Notch; 412. Positioning hole; 42. Telescopic knife handle; 421. Strip hole; 422. Block; 43. First locking member; 431. First lever; 4311. Block; 432. Second elastic member; 44. Second locking member; 441. Second lever; 4411. Positioning block; 442. Third elastic member; 45. Limiting structure; 451. Elastic limiting pin; 4511. Spring sheet; 452. Elastic pressing pin; 46. Protective plate; 47. End cover; 471. Limiting support block. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0044] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0046] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0047] Reference Figure 1 This embodiment provides a knife with a replaceable blade, including a blade body 1, a movable blade 2 and a positioning strip 3.

[0048] Among them, refer to Figure 2 and Figure 3A strip groove is provided on the bottom surface of the blade body 1, and two ends of the strip groove extend to the two ends of the blade body 1 in the blade length direction respectively. At least two positioning pins 11 are fixed in the strip groove, and the positioning pins 11 are perpendicular to the blade surface.

[0049] It is easy to understand that the two ends of the strip groove extend to the two ends of the blade body 1 in the blade length direction, that is, the strip groove is a through groove, and its purpose is to achieve the installation of the movable blade 2.

[0050] Specifically, the positioning pin 11 can be fixed in the strip groove by welding or riveting.

[0051] Specifically, three positioning pins 11 are provided, respectively located at the two ends and the middle of the strip groove. Of course, the positioning pins 11 can be provided with two or four or more, which can be determined according to factors such as knife length and tool material, so as to ensure the reliability of the connection between the blade body 1 and the movable blade 2.

[0052] Among them, refer to Figures 3 to 5 At least two embedding grooves 21 are provided at the top of the movable blade 2 corresponding to the positioning pin 11. The embedding grooves 21 include a vertical groove 211 and a horizontal groove 212. The top of the vertical groove 211 extends to the top of the movable blade 2, and the bottom extends to one side to form a horizontal groove 212. The groove width of the embedding groove 21 is adapted to the positioning pin 11. A locking groove 22 is also provided at the top of the movable blade 2. When in use, the movable blade 2 is first placed under the blade body 1 and the vertical groove 211 is aligned with the positioning pin 11. Then, the movable blade 2 is pushed up so that the positioning pin 11 reaches the bottom of the vertical groove 211. Finally, the movable blade 2 is pushed in the opposite direction of the extension direction of the horizontal groove 212 so that the positioning pin 11 is clamped in the horizontal groove 212. In this way, the movable blade 2 and the blade body 1 are relatively fixed in the vertical direction.

[0053] It should be noted that "vertical" and "horizontal" are based on the orientation of the tool when it is in use.

[0054] It should be noted that the extending directions of the transverse grooves 212 of all the embedding grooves 21 are consistent, that is, all the transverse grooves 212 extend toward the front side or toward the rear side.

[0055] Specifically, three embedding grooves 21 are provided corresponding to the positioning pins 11, which are respectively located at the two ends and the middle of the movable blade 2. Of course, the embedding grooves 21 can also be set to two or four or more, but they must correspond to the positioning pins 11 one by one.

[0056] Specifically, refer to Figure 3 and Figure 5 The movable blade 2 includes a connecting plate 22 and a tapered blade 23 . The connecting plate 22 is adapted to the strip groove, and the tapered blade 23 is integrally formed below the connecting plate 22 .

[0057] Among them, refer to Figure 6 The positioning strip 3 is inserted into the blade body 1 by sliding vertically, and the positioning pin 11 is placed in the transverse groove 212, so that the positioning strip 3 is aligned with the locking groove 22. A first elastic member 31 is also connected between the positioning strip 3 and the blade body 1, and the first elastic member 31 drives the positioning strip 3 to be inserted into the locking groove 22, and the top of the positioning strip 3 is exposed to the blade body 1. When in use, the positioning strip 3 needs to be lifted upwards first, so that the bottom end of the positioning strip 3 is separated from the strip groove to avoid the movement of the active blade 2. When the active blade 2 moves into place, the positioning strip 3 is released, and the positioning strip 3 is reset and snapped into the locking groove 22 under the action of the first elastic member 31, so that the active blade 2 and the blade body 1 are relatively fixed in the transverse direction.

[0058] Specifically, when the positioning pin 11 is placed at the end of the transverse groove 212 away from the vertical groove 211, the positioning strip 3 is aligned with the locking groove 22. When the movable blade 2 is moved laterally, it is only necessary to move the movable blade 2 until it cannot move and stop. At this time, the positioning pin 11 is placed at the end of the transverse groove 212, and the positioning strip 3 is automatically aligned with the locking groove 22. There is no need to try to adjust the alignment of the positioning strip 3 and the locking groove 22 many times, and the installation is more convenient. Of course, the positioning pin 11 can also be placed in the middle of the transverse groove 212 so that the positioning strip 3 is aligned with the locking groove 22, but it is necessary to adjust the position of the movable blade 2 back and forth so that the positioning strip 3 is stuck in the locking groove 22.

[0059] Specifically, the first elastic member 31 is a return spring, one end of which is in contact with the groove of the blade body 1 and the other end is connected to the positioning strip 3. The elastic force of the return spring drives the positioning strip 3 to move downward to be tightly engaged in the locking groove 22. Of course, the first elastic member 31 can also be an elastic steel wire or other structure with elastic return function.

[0060] It should be noted that "exposed" means that the positioning member 3 can be touched directly from the outside or by tools. In this embodiment, for easy operation, two hand-held parts that penetrate the top of the blade body 2 and bend downward are fixedly connected to the top of the positioning member 3. When lifting the positioning member 3, the user can pinch the hand-held parts to operate, which is more convenient.

[0061] In addition, refer to Figure 6 and Figure 7 The present embodiment also provides a preferred structure of a blade body 1, wherein the blade body 1 comprises a mounting plate 12 and two clamping plates 13 respectively arranged on both sides of the mounting plate 12, the bottoms of the two clamping plates 13 extend below the mounting plate 12 to form a strip groove, and the mounting plate 12 is provided with an empty area 121 for accommodating the positioning strip 3 and the first elastic member 31. The blade body 1 adopts a split splicing structure, which is convenient for installing the positioning strip 3 and the first elastic member 31, and can also reduce the difficulty of processing the blade body 1.

[0062] In addition, refer to Figure 1 , Figure 8 and Fig. 9 The knife with replaceable blade of this embodiment is further provided with a handle 4, which is fixedly connected to the rear side of the blade body 1; the handle 4 includes a rotating handle 41 and a telescopic handle 42; one end of the rotating handle 41 is hinged on the blade body 1 and a first embedding groove adapted to the movable blade 2 is opened at the bottom, the rotating handle 41 has a handle state unfolded on the rear side of the blade body 1 and a folded state in which the first embedding groove is wrapped around the outer side of the movable blade 2, and a first locking piece 43 is provided between the rotating handle 41 and the blade body 1 to achieve relative fixation of the two when the rotating handle 41 is in the handle state. The telescopic knife handle 42 is slidably sleeved on the rotating knife handle 41 and has a second embedding groove adapted to the active blade 2 at the bottom. The telescopic knife handle 42 has at least a first gear and a second gear by sliding. When the telescopic knife handle 42 is in the first gear, it is used together with the rotating knife handle 41 in the knife handle state as a knife handle. When the telescopic knife handle 42 is in the second gear, it is used together with the rotating knife handle 41 in the folded state to wrap the active blade 2. A second locking piece 44 is provided between the telescopic knife handle 42 and the rotating knife handle 41 to achieve relative fixation of the two when the telescopic knife handle 42 is in the two gears. When in use, the telescopic knife handle 42 is first adjusted to the second gear and fixed by the second locking piece 44, so that the total length of the first embedding groove and the second embedding groove after superposition matches the active blade 2, and then the first locking piece 43 is loosened, and the knife handle 4 is rotated 180° as a whole, so that the first embedding groove and the second embedding groove wrap the outer side of the active blade 2. The telescopic folding knife handle 4 adopted in this embodiment can be adjusted to a folded state when the knife is not in use, which can avoid damage to the blade and accidental injury caused by the exposed blade, and can shorten the overall length of the knife for easy storage, and is particularly suitable for use in camping, self-driving tours, etc. Of course, the knife handle 4 can also adopt an existing fixed structure.

[0063] It should be noted that when the rotating knife handle 41 is in the handle state, the rotating knife handle 41 and the blade body 1 can be kept relatively fixed by the pre-tightening force at the hinge of the rotating knife handle 41 and the blade body 1, so as to prevent the rotating knife handle 41 from falling off the blade body 1 when in the folded state. Of course, a locking structure such as a top screw can be used to further fix the rotating knife handle 41 and the blade body 1 in the folded state.

[0064] Specifically, the rotating blade handle 41 and the telescopic blade handle 42 are both inverted U-shaped frame structures, the telescopic blade handle 42 is slidably sleeved on the outer side of the rotating blade handle 41, the bottom opening of the rotating blade handle 41 forms a first embedding groove, and the bottom opening of the telescopic blade handle 42 forms a second embedding groove. Of course, the telescopic blade handle 42 can also be slidably sleeved on the inner side of the rotating blade handle 41, and the rotating blade handle 41 and the telescopic blade handle 42 can also adopt a plate-like structure and be connected by a slide rail.

[0065] More specifically, see Fig.10A notch 411 is provided at the top of the rotating knife handle 41, and a slot 14 is provided at the top of the rear end of the blade body 1. The first locking member 43 includes a first lever 431 and a second elastic member 432. The fulcrum of the first lever 431 is connected in the rotating knife handle 41. A block 4311 is provided at the bottom of the front end of the first lever 431. The block 4311 cooperates with the slot 14 to achieve relative fixation of the rotating knife handle 41 and the blade body 1. The rear end of the first lever 431 is connected to the rotating knife handle 41 through the second elastic member 432. The second elastic member 432 is used to drive the rear end of the first lever 431 to move upward, and the rear end of the first lever 431 is exposed to the rotating knife handle 41 through the notch 411. When the rotating knife handle 41 is in the knife handle state, the second elastic member 432 drives the rear end of the first lever 431 to move upward, so that the front end of the first lever 431 moves downward, and then the block 4311 is tightly clamped into the clamping slot 14 to complete the matching; when in use, the rear end of the first lever 431 is pressed downward, so that the front end of the first lever 431 moves upward, so that the block 4311 is separated from the clamping slot 14, and then the rotating knife handle 41 is decoupled from the blade body 1, and the rotating knife handle 41 is in a state of being able to rotate freely. The second elastic member 432 can be a structure with elastic reset function such as a spring.

[0066] It should be noted that when the telescopic handle 42 is in the first gear, the notch 411 is covered by the telescopic handle 42, and the rear end of the first lever 431 is hidden in the telescopic handle 42, so the rotating handle 41 cannot be folded. In this way, the rotating handle 41 can always be kept in the handle state when the knife is in use, thereby ensuring safe use.

[0067] Details, see Fig.11 and Fig.12 The rotating knife handle 41 is provided with two positioning holes 412 spaced apart in the front-to-back direction. The second locking member 44 includes a second lever 441 and a third elastic member 442. The fulcrum of the second lever 441 is connected to the outside of the telescopic knife handle 42. The front end of the second lever 441 is exposed to the telescopic knife handle 42. The rear end of the second lever 441 is provided with a positioning block 4411 penetrating the telescopic knife handle 42. The third elastic member 442 is connected between the second lever 441 and the telescopic knife handle 42 and is used to drive the positioning block 4411 to insert into the positioning hole 412. When the telescopic knife handle 42 is in the first gear or the second gear, the third elastic member 442 drives the positioning block 4411 to move inward to tightly fit into the positioning hole 412 to fix the telescopic knife handle 42 relative to the rotating knife handle 41. When in use, the front end of the second lever 441 is pressed inwardly to move the rear end of the second lever 441 outwardly, so that the positioning block 4411 is disengaged from the positioning hole 412 of the rotating handle 41, thereby realizing the decoupling of the rotating handle 41 and the telescopic handle 42, and the telescopic handle 42 is in a state of being able to freely retract. The third elastic member 442 can be a structure with an elastic reset function such as a spring.

[0068] Further, see Figures 12 to 15 A limiting structure 45 is also provided between the rotating tool handle 41 and the telescopic tool handle 42. The limiting structure 45 includes an elastic limiting pin 451. The elastic limiting pin 451 is installed on the rotating tool handle 41. The elastic limiting pin 451 has a limiting state protruding from the outside of the rotating tool handle 41 and an avoidance state retracted inside the rotating tool handle 41, and the elastic limiting pin 451 remains in the limiting state in the free state. The telescopic tool handle 42 is provided with a limiting hole 421 adapted to the elastic limiting pin 451. The telescopic tool handle 42 can slide to align the elastic limiting pin 451 and insert it into the limiting hole 421 to achieve overextension limiting. When the telescopic knife handle 42 is moved backward, the elastic limit pin 451 is inserted into the limit hole 421 to play a limiting role, thereby preventing the telescopic knife handle 42 from being excessively stretched, and further preventing the telescopic knife handle 42 from falling off the rotating knife handle 41 when being pulled; when the telescopic knife handle 42 needs to be removed for cleaning, the elastic limit pin 451 is pressed inwardly to switch the elastic limit pin 451 to the avoidance state, and the telescopic knife handle 42 is pulled backward while keeping the pressing posture unchanged, to complete the removal of the telescopic knife handle 42; when installing the telescopic knife handle 42, the elastic limit pin 451 is first pressed so that the telescopic knife handle 42 can be sleeved on the rotating knife handle 41, and then the telescopic knife handle 42 is pushed forward. When the elastic limit pin 451 is inserted into the limit hole 421, the elastic limit pin 451 is pressed again to switch it to the avoidance state, and then the telescopic knife handle 42 is continued to be pushed forward until it moves into place.

[0069] Specifically, the limiting hole 421 is a strip hole arranged in the front-to-back direction, and a blocking piece 422 is convexly provided on the outer wall of the telescopic knife handle 42. The blocking piece 422 covers the rear part of the strip hole and is used to guide the elastic limiting pin 451 to be gradually compressed inward. When installing the telescopic knife handle 42, after the elastic limiting pin 451 is inserted into the limiting hole 421, as the telescopic knife handle 42 continues to move forward, the blocking piece 422 will drive the elastic limiting pin 451 to be gradually compressed inward until it switches to the avoidance state, so that the switching of the elastic limiting pin 451 can be automatically completed, and the operation is more convenient. The blocking piece 422 can be designed as an inclined surface or a curved surface to guide the elastic limiting pin 451 to be gradually compressed inward.

[0070] More specifically, the elastic limit pin 451 and the elastic pressing pin 452 are commonly used structures in this field. For example, the elastic limit pin 451 of this embodiment is to fix the spring sheet 4511 on the inner side of the rotating tool handle 41, and then connect the spring sheet 4511 with the pin body of the elastic limit pin 451; the elastic pressing pin 452 is to have a spring mounted on the pin body of the elastic pressing pin 452.

[0071] More specifically, see Fig.12The knife handle 4 also includes a protective plate 46, which is provided with two protective plates 46 and respectively fixed on the outer sides of the two wings of the telescopic knife handle 42. The limiting structure 45 also includes an elastic pressing pin 452, which is provided on the protective plate 46 corresponding to the limiting hole 421 and is provided at the front of the corresponding strip hole. The elastic pressing pin 452 is exposed on the protective plate 46, and the elastic pressing pin 452 is used to realize the switching of the elastic limiting pin 451 between the limiting state and the avoidance state by pressing. The protective plate 46 can improve the appearance quality of the knife and also improve the comfort of hand holding; the state switching of the elastic limiting pin 451 is controlled by the elastic pressing pin 452, without the need for external tools, and the operation is more convenient.

[0072] It is easy to understand that since the rotating blade handle 41 and the telescopic blade handle 42 are both inverted U-shaped frame structures, the rotating blade handle 41 and the telescopic blade handle 42 both have two wings and a belly.

[0073] Specifically, the protection plate 46 can be made of wood, plastic, silica gel or other common materials.

[0074] Further, see Fig.12 and Fig.16 The rear end of the telescopic knife handle 42 is provided with an end cover 47, and the front side of the end cover 47 is provided with a limiting support block 471 suitable for limiting the position of the active blade 2 when the knife handle 4 is folded. The end cover 47 can play a limiting role when the telescopic knife handle 42 is pushed forward, and can also improve the appearance quality of the knife; the limiting support block 471 can limit the position of the active inner cover blade 2 when the knife handle 4 is folded, so as to prevent the front end of the active blade 2 from extending too deeply into the second embedding groove, causing damage to the internal structure of the knife handle 4.

[0075] The working principle of the tool with replaceable blade of this embodiment is as follows:

[0076] When the movable blade 2 is damaged, the movable blade 2 is removed from the blade body 1, and a new movable blade 2 is installed on the blade body 1; when it needs to be used in different scenarios, the movable blade 2 is removed from the blade body 1, and an movable blade 2 with an adaptive function is selected and installed on the blade body 1.

[0077] When using the knife daily, adjust the rotating knife handle to the knife handle state, and adjust the telescopic knife handle to the first gear; when storing the knife, adjust the telescopic knife handle to the second gear, and then adjust the rotating knife handle to the folded state; when cleaning the knife, remove the telescopic knife handle from the rotating knife handle.

[0078] The above is only a specific implementation of the utility model, so that those skilled in the art can understand or implement the utility model. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A knife with replaceable blade, characterized in that: include: The blade body (1) has a strip groove on its bottom surface, the two ends of the strip groove respectively extending to the two ends of the blade body (1) in the blade length direction, at least two positioning pins (11) are fixed in the strip groove, and the positioning pins (11) are perpendicular to the blade surface; The movable blade (2) has at least two embedding grooves (21) at its top corresponding to the positioning pin (11), the embedding grooves (21) comprising a vertical groove (211) and a transverse groove (212), the top of the vertical groove (211) extending to the top of the movable blade (2), and the bottom extending to one side to form the transverse groove (212), the groove width of the embedding groove (21) being adapted to the positioning pin (11), and the top of the movable blade (2) also having a locking groove (22); A positioning strip (3) is inserted into the blade body (1) in a vertically sliding manner. When the positioning pin (11) is placed in the transverse groove (212), the positioning strip (3) is aligned with the locking groove (22). A first elastic member (31) is connected between the positioning strip (3) and the blade body (1). The first elastic member (31) drives the positioning strip (3) to be inserted into the locking groove (22). The top of the positioning strip (3) is exposed outside the blade body (1).

2. The knife with replaceable blade according to claim 1, characterized in that: The blade body (1) comprises a mounting plate (12) and two clamping plates (13) respectively arranged on both sides of the mounting plate (12), the bottoms of the two clamping plates (13) extending below the mounting plate (12) to form the strip-shaped groove, and the mounting plate (12) is provided with an empty area (121) for accommodating the positioning strip (3) and the first elastic member (31).

3. The knife with replaceable blade according to claim 1 or 2, characterized in that: It also comprises a knife handle (4), wherein the knife handle (4) is fixedly connected to the rear side of the knife body (1); The knife handle (4) comprises a rotating knife handle (41) and a telescopic knife handle (42); One end of the rotating knife handle (41) is hinged on the blade body (1) and a first embedding groove adapted to the movable blade (2) is provided at the bottom thereof; the rotating knife handle (41) has a handle state in which it is unfolded on the rear side of the blade body (1) and a folded state in which the first embedding groove is wrapped around the outer side of the movable blade (2); a first locking piece (43) is provided between the rotating knife handle (41) and the blade body (1) for achieving relative fixation of the two when the rotating knife handle (41) is in the handle state; The telescopic knife handle (42) is slidably sleeved on the rotating knife handle (41) and has a second embedding groove adapted to the movable blade (2) at the bottom. The telescopic knife handle (42) has at least a first gear position and a second gear position by sliding. When the telescopic knife handle (42) is in the first gear position, it cooperates with the rotating knife handle (41) in the knife handle state to be used as a knife handle. When the telescopic knife handle (42) is in the second gear position, it cooperates with the rotating knife handle (41) in the folded state to wrap the movable blade (2). A second locking piece (44) is provided between the telescopic knife handle (42) and the rotating knife handle (41) for achieving relative fixation of the telescopic knife handle (42) and the rotating knife handle (41) when the telescopic knife handle (42) is in the two gear positions.

4. The knife with replaceable blade according to claim 3, characterized in that: The rotating knife handle (41) and the telescopic knife handle (42) are both inverted U-shaped frame structures. The telescopic knife handle (42) is slidably sleeved on the outer side of the rotating knife handle (41). The bottom opening of the rotating knife handle (41) forms the first embedding groove, and the bottom opening of the telescopic knife handle (42) forms the second embedding groove.

5. The knife with replaceable blade according to claim 4, characterized in that: The top of the rotating knife handle (41) is provided with a notch (411), the top of the rear end of the blade body (1) is provided with a slot (14), the first locking member (43) comprises a first lever (431) and a second elastic member (432), the fulcrum of the first lever (431) is connected inside the rotating knife handle (41), a block (4311) is provided at the bottom of the front end of the first lever (431), the block (4311) cooperates with the slot (14) to achieve relative fixation of the rotating knife handle (41) and the blade body (1), the rear end of the first lever (431) is connected to the rotating knife handle (41) via the second elastic member (432), the second elastic member (432) is used to drive the rear end of the first lever (431) to move upward, and the rear end of the first lever (431) is exposed from the rotating knife handle (41) via the notch (411).

6. The knife with replaceable blade according to claim 4, characterized in that: The rotating knife handle (41) is provided with two positioning holes (412) spaced apart in the front-to-back direction. The second locking member (44) comprises a second lever (441) and a third elastic member (442). The fulcrum of the second lever (441) is connected to the outside of the telescopic knife handle (42). The front end of the second lever (441) is exposed outside the telescopic knife handle (42). The rear end of the second lever (441) is provided with a positioning block (4411) penetrating the telescopic knife handle (42). The third elastic member (442) is connected between the second lever (441) and the telescopic knife handle (42) and is used to drive the positioning block (4411) to be inserted into the positioning hole (412).

7. The knife with replaceable blade according to claim 4, characterized in that: A limiting structure (45) is further provided between the rotating tool handle (41) and the telescopic tool handle (42), wherein the limiting structure (45) comprises an elastic limiting pin (451), wherein the elastic limiting pin (451) is mounted on the rotating tool handle (41), wherein the elastic limiting pin (451) has a limiting state in which it protrudes from the outside of the rotating tool handle (41) and an avoidance state in which it is retracted from the inside of the rotating tool handle (41), and wherein the elastic limiting pin (451) is maintained in the limiting state in a free state, wherein the telescopic tool handle (42) is provided with a limiting hole (421) adapted to the elastic limiting pin (451), and wherein the telescopic tool handle (42) can slide to align the elastic limiting pin (451) with the limiting hole (421) to achieve overextension limiting.

8. The knife with replaceable blade according to claim 7, characterized in that: The limiting hole (421) is a strip-shaped hole arranged along the front-to-back direction. A blocking piece (422) is protrudingly provided on the outer wall of the telescopic knife handle (42). The blocking piece (422) covers the rear part of the strip-shaped hole and is used to guide the elastic limiting pin (451) to be gradually compressed inwardly.

9. The knife with replaceable blade according to claim 8, characterized in that: The knife handle (4) further comprises a protective plate (46), wherein the protective plate (46) is provided with two and respectively fixed to the outer sides of the two wings of the telescopic knife handle (42), and the limiting structure (45) further comprises an elastic pressing pin (452), wherein the elastic pressing pin is provided on the protective plate (46) corresponding to the limiting hole (421) and is provided corresponding to the front part of the strip hole, and the elastic pressing pin (452) is exposed on the protective plate (46), and the elastic pressing pin (452) is used to realize the switching of the elastic limiting pin (451) between the limiting state and the avoidance state by pressing.

10. The knife with replaceable blade according to claim 4, characterized in that: An end cover (47) is provided at the rear end of the telescopic knife handle (42), and a limiting support block (471) suitable for limiting the position of the movable blade (2) when the knife handle (4) is folded is provided at the front side of the end cover (47).

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