Utility knife

Abstract

The utility model belongs to the technical field of knives, and particularly relates to a utility knife. The utility knife includes a shell, a bottom plate slidably arranged in the shell along the length direction thereof, a blade fixedly connected to the bottom plate, and a push button capable of pushing the bottom plate. Slide plates are slidably arranged on the two opposite end surfaces in the upper part of the shell along the length direction of the shell, a sliding notch is provided in the shell above the slide plate, a push block is provided on the slide plate, the push block is slidably arranged in the sliding notch and can push the slide plate; a long strip guard plate is fixedly connected to the slide plate along the length direction of the blade, a guard plate groove is provided on the lower end surface of the guard plate, and the guard plate groove can be slidably inserted in the back of the blade. The utility model can protect the blade through the guard plate when the blade is cutting an object to avoid its distortion and breakage, and the length of the guard plate extension can be adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of cutter tools, in particular to an art knife. Background Art

[0002] Existing utility knives, such as the Chinese invention patent application with application number 201911266874.0, disclose a utility knife, including a blade, a handle switch and a knife shell, wherein the knife shell has a knife groove for the blade to slide with; the knife shell is provided with an opening for the handle switch to slide with; the blade is connected to the handle switch, and the knife shell is provided with a plurality of grooves, which are arranged in two rows and are basically parallel; the handle switch is provided with a first elastic buckle and a second elastic buckle on both sides, respectively, and the first elastic buckle can be embedded in a row of grooves; the second elastic buckle can be embedded in another row of grooves; the handle switch is provided with a locking and unlocking structure that can make the first elastic buckle or the second elastic buckle escape from the groove. The utility knife has low cost, high working reliability and high safety.

[0003] The existing utility knives have the following technical problems: when the blade needs to be used to cut a harder object, when the blade is extended for a long time, the blade tends to shake, twist, or even break. Especially when the object needs to be cut by percussion, since most existing utility knives are not provided with a blade protection structure, the blade is more likely to break, which is not only unsafe to use, but also causes material loss. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the present application provides a utility knife which can protect the blade through a guard plate when the blade cuts objects and the extension length of the guard plate can be adjusted.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A utility knife comprises a shell, a base plate slidably arranged in the shell along the length direction thereof, a blade fixedly connected to the base plate, a push button capable of pushing the base plate, and a base plate locking structure capable of locking the base plate; slide plates are slidably arranged on two opposite end surfaces of the upper inner part of the shell along the length direction of the shell; a sliding notch is provided in the shell above the slide plate; a push block is provided on the slide plate, the push block is slidably arranged in the sliding notch and can push the slide plate; a long strip guard plate is fixedly connected to the slide plate along the length direction of the blade; a guard plate groove is provided on the lower end surface of the guard plate, and the guard plate groove can be slidably inserted on the back of the blade.

[0007] Preferably, skateboard grooves are provided on the two opposite end surfaces of the upper inner part of the shell, the skateboard is slidably arranged in the skateboard grooves, and a plurality of skateboard clamping grooves are provided on the upper groove wall of the skateboard groove along the length direction of the shell; a skateboard spring sheet is fixedly mounted on the skateboard below the push block, and the push block is slidably embedded on the skateboard; when the push block is not pressed, the skateboard spring sheet is clamped in a skateboard clamping groove, and when the push block is pressed, the skateboard spring sheet can be disengaged from the skateboard clamping groove.

[0008] Preferably, a skateboard groove is provided on the upper end surface of the skateboard along its length direction, a skateboard transverse groove is provided at the bottom of the skateboard groove, and a skateboard longitudinal groove is provided on the upper end surface of the skateboard along its width direction; the skateboard spring sheet includes a card plate and an elastic plate formed by two side surfaces of the card plate extending toward the outside thereof respectively; the card plate is slidably arranged in the skateboard longitudinal groove, and the two card plates are straddling the groove bottom of the skateboard groove on both sides of the skateboard transverse groove, and the push block is slidably embedded in the skateboard groove; when the push block is not pressed, the card plate is clamped in a certain skateboard slot, and when the push block is pressed, the card plate can be disengaged from the skateboard slot.

[0009] Preferably, a clamping strip extending to the top of the slide groove is fixedly connected to the upper end surface of the slide, and a clamping block is fixedly connected to the lower end surface of the push block, and the clamping block is slidably embedded in the slide groove.

[0010] Preferably, a guard plate installation groove is opened on the groove wall of the skateboard transverse groove, and a connecting plate is fixedly connected to one end of the guard plate, and the connecting plate can be fixedly embedded in the guard plate installation groove.

[0011] Preferably, a bottom plate groove is opened on the upper surface of the bottom plate along its length direction, a bottom plate transverse groove is opened at the bottom of the bottom plate groove, and a bottom plate longitudinal groove is opened on the upper surface of the bottom plate along its width direction; the bottom plate spring piece is arranged across the bottom of the bottom plate groove on both sides of the bottom plate transverse groove, the locking strip is slidably arranged in the bottom plate longitudinal groove and is arranged above the bottom plate spring piece, and the push button is slidably embedded in the bottom plate groove; a plurality of bottom plate slots are opened on the inner side of the shell opposite to the bottom plate along its length direction, when the push button is not pressed, the locking strip is stuck in a certain bottom plate slot, and when the push button is pressed, the locking strip can be disengaged from the bottom plate slot.

[0012] Preferably, a guide column is embedded on one end surface of the bottom plate opposite to the push button, and a guide groove is opened along the length direction of the inner end surface of the shell opposite to the guide column, and the guide column can be slidably disposed in the guide groove.

[0013] Preferably, a countersunk hole is opened on the end surface of one side of the base plate opposite to the push button, a limiting head is fixedly connected to one end of the guide column, the guide column is slidably arranged in the countersunk hole, the limiting head can be slidably arranged in the guide groove, and a compression spring is sleeved on the guide column.

[0014] Preferably, a limiting groove is provided on an end face of one side of the base plate opposite to the push button along its length direction, and a tool changing slide groove is provided above the limiting groove along the length direction of the base plate; the tool changing plate can be slidably embedded in the shell perpendicular to the direction of the base plate, and a limiting block is fixedly connected to the tool changing plate in the shell, and a tool changing groove is provided on the inner side of the shell on the side of the tool changing plate away from the push button; when the tool changing plate is not pushed, the limiting block can be stuck in the limiting groove to prevent the limiting head from entering the tool changing groove; when the tool changing plate is pushed, the limiting block is inserted into the tool changing slide groove, and the limiting head can enter the tool changing groove.

[0015] Preferably, a long strip-shaped tool changing plate through groove is opened along the length direction of the tool changing plate on one side of the tool changing plate close to the push button, and a tool changing protrusion is arranged on the side of the tool changing plate at the through groove; and upper and lower shell card slots are opened on the inner end surface of the shell opposite to the tool changing protrusion, when the tool changing plate is not pushed, the tool changing protrusion is stuck in the lower shell card slot, and when the tool changing plate is pushed, the tool changing protrusion is stuck in the upper shell card slot.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model can adjust the extended length of the guard plate according to the extended length of the blade by arranging the slide plate, the sliding notch, the push block and the guard plate, and can make the back of the blade pass through the guard plate. Therefore, when the blade is cutting, the force stability of the blade is enhanced due to the protection of the guard plate, thereby effectively avoiding the blade from shaking, twisting and breaking. In addition, the objects can be cut by knocking, ensuring the safety of use.

[0018] In addition, by providing the slide plate slot, slide plate slot and slide plate spring, when the push block is not pressed, the slide plate spring is locked in a slide plate slot, thereby fixing the relative position of the blade in the housing, and when the push block is pressed, the slide plate spring can be disengaged from the slide plate slot to push the slide plate and the blade, thereby adjusting the extension length of the blade. In addition, the product of the utility model is flexible and convenient to use and operate, and the manufacturing cost is also very low, which is worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model when in use.

[0020] Figure 2 It is a schematic diagram of the structure of the utility model when not in use.

[0021] Figure 3 This is a schematic diagram of the explosion structure of the utility model from the first perspective.

[0022] Figure 4 This is a schematic diagram of the explosion structure of the utility model from a second viewing angle.

[0023] Figure 5 It is a structural schematic diagram of the second shell of the utility model.

[0024] Figure 6 The utility model is a schematic diagram of the exploded structure of the push button, blade, bottom plate, guide column and compression spring.

[0025] Figure 7 It is a schematic cross-sectional structure diagram of the push button, blade, bottom plate, guide column, compression spring and bottom plate spring piece of the utility model.

[0026] Figure 8 It is a schematic diagram of the connection structure between the first shell and the slide plate, the guard plate and the push block of the utility model.

[0027] Fig. 9 for Figure 8 A is an enlarged structural diagram of FIG.

[0028] Fig.10 It is a schematic diagram of the exploded structure of the guard plate, the slide plate, the slide plate shrapnel and the push block of the utility model from the first perspective.

[0029] Fig.11 It is a schematic diagram of the exploded structure of the guard plate, the slide plate, the slide plate shrapnel and the push block of the utility model from a second perspective.

[0030] Fig.12 It is a structural schematic diagram of the tool changing plate of the utility model.

[0031] In the figure: 1, housing, 11, first housing, 111, bottom plate slot, 112, guide slot, 113, tool change groove, 114, housing slot, 115, slide plate slot, 116, sliding notch, 117, slide plate slot, 12, second housing, 121, push button slot, 122, bottom plate slot,

[0032] 2. Bottom plate, 21. Bottom plate groove, 22. Bottom plate transverse groove, 23. Bottom plate longitudinal groove, 24. Bottom plate spring, 25. Locking strip, 26. Guide column, 261. Limiting head, 27. Countersunk hole, 28. Compression spring, 29. Limiting groove, 291. Tool change slide groove,

[0033] 3. Blade, 4. Push button,

[0034] 5. Tool change plate, 51. Limit block, 52. Plate slot, 53. Tool change protrusion, 54. Block,

[0035] 6. Slide plate, 61. Slide plate groove, 62. Slide plate horizontal groove, 63. Slide plate vertical groove, 64. Card strip, 65. Guard plate installation groove,

[0036] 7. Push block, 71. Card block,

[0037] 8. guard plate, 81. guard plate groove, 82. connecting plate, 9. skateboard spring piece, 91. clamping plate, 92. elastic plate. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention. Example

[0040] See attached Figure 1 , 2 As shown in Figures 3 and 4, a utility knife comprises a housing 1, wherein the housing 1 comprises a first housing 11 and a second housing 12 which can be fixedly engaged with each other. A bottom plate slide groove 111 is provided on the inner side end surface of the first housing 11 along its length direction, and the bottom plate 2 can be slidably embedded in the bottom plate slide groove 111. The blade 3 is detachably fixedly connected to the bottom plate 2, and a push key slide groove 121 is provided on the second housing 12 opposite to the bottom plate slide groove 111 along the length direction of the second housing 12, and the push key slide groove 121 penetrates the second housing 12. The push key 4 can be slidably arranged in the push key slide groove 121 and connected to the bottom plate 2. Therefore, when the push key 4 is pushed, the push key 4 can drive the bottom plate 2 and the blade 3 to slide in the housing 1 so that the tip of the blade 3 extends out from the opening of the housing 1. Of course, in order to lock the extension length of the blade 3, a bottom plate locking structure that can lock the bottom plate 2 is also included. The bottom plate locking structure is an existing structure, and it only needs to be able to achieve locking of the bottom plate 2 in the housing 1. In this embodiment, the following bottom plate locking structure is adopted.

[0041] See also Figure 5 As shown, in this embodiment, the bottom plate locking structure includes a plurality of bottom plate slots 122 opened along the length direction of the inner end surface of the second shell 12 at the upper and lower edges of the push button slot 121 and a locking assembly arranged on the bottom plate 2, and the two groups of bottom plate slots 122 are symmetrically arranged up and down.

[0042] See also Figure 6 , 7 As shown, a bottom plate groove 21 is provided on the upper end surface of the bottom plate 2 along its length direction, a bottom plate transverse groove 22 is provided at the bottom of the bottom plate groove 21, and the bottom plate transverse groove 22 penetrates the bottom plate 2, and a bottom plate longitudinal groove 23 is provided on the upper end surface of the bottom plate 2 along its width direction and penetrates the bottom plate 2. The locking assembly includes a bottom plate spring piece 24 and a locking strip 25, the long plate-shaped bottom plate spring piece 24 is arranged across the bottom of the bottom plate groove 21 on both sides of the bottom plate transverse groove 22, the locking strip 25 is slidably arranged in the bottom plate longitudinal groove 23 and arranged above the bottom plate spring piece 24, and the push button 4 is slidably embedded in the bottom plate groove 21.

[0043] When the push button 4 is not pressed, the two ends of the locking strip 25 are respectively locked in a corresponding group of bottom plate slots 122, and the relative position of the bottom plate 2 in the shell 1 can be locked; when the push button 4 is pressed, the locking strip 25 can be disengaged from the bottom plate slot 122, so that the bottom plate 2 can be pushed to drive the blade 3 to move, and the length of the blade 3 extending out of the shell 1 can be adjusted.

[0044] Furthermore, a guide column 26 is embedded on one end face of the bottom plate 2 opposite to the push button 4 , and a guide groove 112 is formed along the length direction of the inner end face of the first shell 11 opposite to the guide column 26 , and the guide column 26 can be slidably disposed in the guide groove 112 .

[0045] Furthermore, a countersunk hole 27 is provided on the end surface of the bottom plate 2 opposite to the push button 4, and the countersunk hole 27 penetrates the bottom plate 2. A limit head 261 is integrally formed and fixedly connected at one end of the guide column 26. The guide column 26 is slidably arranged in the countersunk hole 27, and the limit head 261 can be slidably arranged in the guide groove 112. The outer diameter of the limit head 261 is larger than the inner diameter of the countersunk hole 27, and a compression spring 28 is sleeved on the guide column 26. The upper end of the guide column 26 extends to the upper end surface of the bottom plate 2, and the blade 3 is sleeved on the guide column 26 above the bottom plate 2.

[0046] See also Figure 6 As shown, a limiting groove 29 is provided on the end surface of one side of the base plate 2 away from the push button 4 along its length direction, and a tool changing slide groove 291 is provided above the limiting groove 29 along the length direction of the base plate 2.

[0047] The tool changing plate 5 can be slidably embedded in the first shell 11 in a direction perpendicular to the bottom plate 2. To facilitate the movement of the tool changing plate 5, a shift block 54 is fixedly embedded on the outer side of the tool changing plate 5. A limiting block 51 is fixedly connected to the tool changing plate 5 in the first shell 11. A tool changing groove 113 is provided on the inner side of the first shell 11 on the side of the tool changing plate 5 away from the push button 4. The tool changing groove 113 is correspondingly arranged to the guide groove 112 and the depth of the tool changing groove 113 is greater than the depth of the guide groove 112, that is, the limiting head 261 can slide into the tool changing groove 113 from the guide groove 112, and the tool changing plate 5 is arranged between the guide groove 112 and the tool changing groove 113.

[0048] When the tool-changing plate 5 is not pushed, the limit block 51 can be stuck in the limit groove 29, and the groove wall of the limit groove 29 blocks the limit head 261 from entering the tool-changing groove 113. At this time, due to the blocking effect of the first shell 11 and the second shell 12, the blade 3 cannot be separated from the guide column 26. When the tool-changing plate 5 is pushed, the limit block 51 is inserted into the tool-changing slide groove 291, and the bottom plate 2 can continue to move toward the shell outlet direction so that the limit head 261 enters the tool-changing groove 113. After the limit head 261 enters the tool-changing groove 113, due to the elastic force of the compression spring 28, the limit head 261 drives the guide column 26 to move toward the groove bottom of the tool-changing groove 113 until the upper end of the guide column 26 is separated from the blade 3, so that the blade 3 can be pulled out of the shell 1 to replace the blade 3.

[0049] See also Figure 8 , 9 As shown in FIGS. 12 and 13 , further, a strip-shaped plate slot 52 is provided on one side of the tool-changing plate 5 near the push button 4 along the length direction of the tool-changing plate 5, and a tool-changing protrusion 53 is integrally formed on the side of the tool-changing plate 5 at the plate slot 52. An upper and lower shell card slots 114 are provided on the inner end surface of the first shell 11 opposite to the tool-changing protrusion 53. When the tool-changing plate 5 is not pushed, the tool-changing protrusion 53 is stuck in the lower shell card slot 114, and at this time, the limit block 51 is stuck in the limit slot 29. When the tool-changing plate 5 is pushed, the tool-changing protrusion 53 is stuck in the upper shell card slot 114, and at this time, the limit block 51 is stuck in the tool-changing slide groove 291. The tool-changing plate 5 is made of elastic material, and the tool-changing protrusion 53 and the shell card slot 114 are provided to achieve positioning of the tool-changing plate 5.

[0050] See also Figure 8 , 10As shown in Figures 1 and 11, two opposite end surfaces in the upper part of the first housing 11 and the second housing 12 are provided with slideway grooves 115 along the length direction of the blade 3, and the slideway 6 is slidably arranged in the slideway grooves 115. The first housing 11 and the second housing 12 above the slideway 6 are provided with sliding notches 116, respectively. A push block 7 is provided on the slideway 6, and the push block 7 is slidably arranged in the sliding notch 116 and can push the slideway 6. A long strip guard plate 8 is fixedly connected to the slideway 6 along the length direction of the blade 3, and a guard plate groove 81 is provided on the lower end surface of the guard plate 8, and the guard plate groove 81 can be slidably inserted at the back of the blade 3.

[0051] A plurality of slide slots 117 are respectively provided on the upper groove wall of the slide slot 115 on the first housing 11 and the second housing 12 along the length direction of the housing 1. A slide spring piece 9 is fixedly mounted on the slide 6 below the push block 7, and the push block 7 is slidably embedded on the slide 6.

[0052] Specifically, a slide groove 61 is provided on the upper end surface of the slide plate 6 along its length direction, a slide transverse groove 62 is provided on the groove bottom of the slide groove 61, and a slide longitudinal groove 63 is provided on the upper end surface of the slide plate 6 along its width direction. The slide plate spring piece 9 includes a clamping plate 91 and an elastic plate 92 formed by extending the two side surfaces of the clamping plate 91 to the outside thereof. The clamping plate 91 is slidably arranged in the slide longitudinal groove 63, and the two clamping plates 91 are arranged across the groove bottom of the slide groove 61 on both sides of the slide transverse groove 62, and the push block 7 is slidably embedded in the slide groove 61.

[0053] Furthermore, a clamping strip 64 extending to the upper side of the slide plate groove 61 is integrally formed and fixedly connected to the upper side of the slide plate 6, and a clamping block 71 is integrally formed and fixedly connected to the lower side of the push block 7, and the clamping block 71 is slidably embedded in the slide plate groove 61. When the push block 7 is not pressed, the clamping plate 91 is clamped in a certain slide plate clamping groove 117, thereby locking the position of the slide plate 6 and the guard plate 8; when the push block 7 is pressed, the clamping plate 91 can be disengaged from the slide plate clamping groove 117, thereby pushing the push block 7 to adjust the length of the guard plate 8 extending out of the housing 1.

[0054] Furthermore, in order to facilitate the installation of the guard plate 8 on the skateboard 6, a guard plate installation groove 65 is opened on the groove wall of the skateboard transverse groove 62, and a connecting plate 82 is fixedly connected to one end of the guard plate 8, and the connecting plate 82 can be fixedly embedded in the guard plate installation groove 65.

[0055] The working process of the embodiment of the utility model is as follows:

[0056] When the utility knife of the present invention is not in use, Figure 2As shown, at this time, the blade 3 and the guard plate 8 are completely retracted into the shell 1; when it is necessary to extend a longer blade 3 for cutting or cutting harder objects or for percussion cutting, press the push button 4 and push the base plate 2 forward to extend the blade 3 to an appropriate length. When the push button 4 is released, the locking strip 25 on the base plate 2 is stuck in the corresponding base plate slot 122, thereby fixing the position of the base plate 2 and the blade 3. Afterwards, press the push block 7 and push the slide plate 6 forward to extend the guard plate 8 to an appropriate length. When the push block 7 is released, the strip 65 on the slide plate 6 is stuck in the corresponding slide plate slot 117, thereby fixing the position of the slide plate 6 and the guard plate 8. At this time, the guard plate 8 can wrap the upper part and the back of the blade 4 to prevent the blade 3 from shaking, twisting, or breaking.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A utility knife, comprising a housing, a bottom plate slidably arranged in the housing along the length direction thereof, a blade fixedly connected to the bottom plate, and a push button capable of pushing the bottom plate, characterized in that: Slide plates are slidably arranged on opposite end surfaces of the upper inner part of the shell along the length direction of the shell, a sliding notch is opened at the shell above the slide plate, a push block is arranged on the slide plate, the push block is slidably arranged in the sliding notch and can push the slide plate; A long strip guard plate is fixedly connected to the slide plate along the length direction of the blade, and a guard plate groove is provided on the lower end surface of the guard plate. The guard plate groove can be slidably inserted at the back of the blade.

2. A utility knife according to claim 1, characterized in that: Slide plate grooves are provided on the two opposite end surfaces of the upper inner part of the shell, the slide plate is slidably arranged in the slide plate grooves, and a plurality of slide plate clamping grooves are provided on the upper groove wall of the slide plate groove along the length direction of the shell; a slide plate spring piece is fixedly mounted on the slide plate below the push block, and the push block is slidably embedded on the slide plate; when the push block is not pressed, the slide plate spring piece is clamped in a certain slide plate clamping groove, and when the push block is pressed, the slide plate spring piece can be disengaged from the slide plate clamping groove.

3. A utility knife according to claim 2, characterized in that: A skateboard groove is provided on the upper end surface of the skateboard along its length direction, a skateboard transverse groove is provided at the bottom of the skateboard groove, and a skateboard longitudinal groove is provided on the upper end surface of the skateboard along its width direction; the skateboard spring sheet includes a card plate and an elastic plate formed by two side surfaces of the card plate extending outward respectively; the card plate is slidably arranged in the skateboard longitudinal groove, and the two card plates are straddling the groove bottom of the skateboard groove on both sides of the skateboard transverse groove, and the push block is slidably embedded in the skateboard groove; when the push block is not pressed, the card plate is clamped in a certain skateboard slot, and when the push block is pressed, the card plate can be separated from the skateboard slot.

4. A utility knife according to claim 3, characterized in that: A clamping strip extending to the top of the slide groove is fixedly connected to the upper end surface of the slide, and a clamping block is fixedly connected to the lower end surface of the push block. The clamping block is slidably embedded in the slide groove.

5. A utility knife according to claim 4, characterized in that: A guard plate installation groove is provided on the groove wall of the slide plate transverse groove, and a connecting plate is fixedly connected to one end of the guard plate. The connecting plate can be fixedly embedded in the guard plate installation groove.

6. The utility knife according to claim 1, characterized in that: A bottom plate groove is provided on the upper surface of the bottom plate along its length direction, a bottom plate transverse groove is provided at the bottom of the bottom plate groove, and a bottom plate longitudinal groove is provided on the upper surface of the bottom plate along its width direction; a bottom plate spring piece is arranged across the bottom of the bottom plate groove on both sides of the bottom plate transverse groove, a locking strip is slidably arranged in the bottom plate longitudinal groove and is arranged above the bottom plate spring piece, and the push button is slidably embedded in the bottom plate groove; a plurality of bottom plate slots are provided on the inner side of the shell opposite to the bottom plate along its length direction, when the push button is not pressed, the locking strip is arranged in a certain bottom plate slot, and when the push button is pressed, the locking strip can be disengaged from the bottom plate slot.

7. The utility knife according to claim 1, characterized in that: A guide column is embedded on one end surface of the bottom plate away from the push button, and a guide groove is opened along the length direction of the inner end surface of the shell body opposite to the guide column, and the guide column can be slidably arranged in the guide groove.

8. A utility knife according to claim 7, characterized in that: A countersunk hole is opened on the end surface of one side of the bottom plate away from the push button, a limiting head is fixedly connected to one end of the guide column, the guide column is slidably arranged in the countersunk hole, the limiting head can be slidably arranged in the guide groove, and a compression spring is sleeved on the guide column.

9. A utility knife according to claim 8, characterized in that: A limiting groove is provided on an end face of one side of the base plate opposite to the push button along its length direction, and a tool changing slide groove is provided above the limiting groove along the length direction of the base plate; the tool changing plate can be slidably embedded in the shell perpendicular to the direction of the base plate, and a limiting block is fixedly connected to the tool changing plate in the shell, and a tool changing groove is provided on the inner side of the shell on the side of the tool changing plate away from the push button; when the tool changing plate is not pushed, the limiting block can be stuck in the limiting groove to prevent the limiting head from entering the tool changing groove; when the tool changing plate is pushed, the limiting block is inserted into the tool changing slide groove, and the limiting head can enter the tool changing groove.

10. The utility knife according to claim 9, characterized in that: A long strip-shaped tool-changing plate through groove is provided on one side of the tool-changing plate near the push button along the length direction of the tool-changing plate, and a tool-changing protrusion is provided on the side of the tool-changing plate at the through groove; and upper and lower shell card slots are provided on the inner end surface of the shell opposite to the tool-changing protrusion, when the tool-changing plate is not pushed, the tool-changing protrusion is stuck in the lower shell card slot, and when the tool-changing plate is pushed, the tool-changing protrusion is stuck in the upper shell card slot.

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