CN219837815U - Art designing knife - Google Patents

Abstract

The utility model provides an art designing knife, which comprises a knife handle, a blade and a blade driving assembly, wherein the blade driving assembly comprises an adjusting part, a blade mounting part and an elastic piece positioned between the adjusting part and the blade mounting part, the adjusting part is slidably and fixedly arranged on the knife handle in a preset gear position, one end of the blade mounting part is fixedly connected with the blade, and the other end of the blade mounting part is slidably connected with the adjusting part; the adjusting part comprises an adjusting part main body, a first pushing block and a second pushing block, wherein the first pushing block and the second pushing block are arranged on the adjusting part main body, one end of the second pushing block is fixedly connected with the blade mounting part, and the other end of the second pushing block is in sliding connection with the adjusting part main body. Compared with the prior art, the utility knife has the advantages that the function of the safety knife is added on the basis of the original utility knife function, and the utility knife function or the safety knife function is selected according to different requirements, so that the technical problems faced by the utility knife and the safety knife in the prior art are solved.

Description

Art designing knife

Technical Field

The utility model relates to the technical field of cutters, in particular to an art designing cutter.

Background

Art designing knives are a common tool for cutting or cutting, also commonly known as nicking knives or wallpaper knives. The conventional art designing knife has the structures of a blade, a push block, a knife handle and the like, and the length of the blade extending out of the knife handle is controlled by the push block. If the blade of the utility knife is extended too long during use, the exposed blade can easily cause injury to the user.

The safety knife is a knife capable of controlling the extension length of the knife blade when in use, and the defect of overlong extension of the art knife is well overcome. The safety knife is provided with a safety rebound structure, a tension spring connected with the rear end of the blade is arranged in the knife handle, and when the safety knife is used, the blade is pulled by the tension spring, so that the blade needs to be continuously pushed forward to overcome the tension of the tension spring to pull the blade out of the knife handle. When the safety knife is loosened, the tension spring can pull the blade back into the knife handle by utilizing the self elasticity, so that the exposed blade is prevented from damaging a user. However, compared with art designing knives, the safety knife needs to continuously push the blade forward when in use, and is not suitable for long-time use.

Disclosure of Invention

Therefore, the present utility model is directed to a utility knife, which has the functions of a safety knife added to the original utility knife function, and the utility knife function or the safety knife function is selected according to different requirements, so as to solve the technical problems faced by the utility knife and the safety knife in the prior art.

The utility model provides an art designing knife, which comprises a knife handle, a blade and a blade driving assembly, wherein the blade driving assembly comprises an adjusting part, a blade mounting part and an elastic piece positioned between the adjusting part and the blade mounting part, the adjusting part is slidably and fixedly arranged on the knife handle in a preset gear position, one end of the blade mounting part is fixedly connected with the blade, and the other end of the blade mounting part is slidably connected with the adjusting part; the adjusting part comprises an adjusting part main body, a first pushing block and a second pushing block, wherein the first pushing block and the second pushing block are arranged on the adjusting part main body, one end of the second pushing block is fixedly connected with the blade mounting part, the other end of the second pushing block is slidably connected with the adjusting part main body, the second pushing block is pushed to enable the blade to extend out of the handle, and the second pushing block is released to enable the blade to retract into the handle.

Further, the adjusting part is also provided with a locking structure, which comprises a push button arranged on the second push block in a clamping way and a chute arranged on the main body of the adjusting part, and the push button is arranged in the chute in a sliding way; the sliding groove comprises a main groove section and a locking groove section, when the push button is positioned in the main groove section, the second push block can slide relative to the main body of the adjusting part, and when the push button is positioned in the locking groove section, the second push block can be fixed relative to the main body of the adjusting part.

Further, the main groove section is mutually communicated with the locking groove section, the main groove section extends along the sliding path of the second pushing block, and the locking groove section is perpendicular to the main groove section.

Further, the locking groove section is located below one end of the main groove section, which is close to the first pushing block.

Further, the adjusting part further comprises a locating pin and a locating pin spring, the locating pin spring is located between the locating pin and the adjusting part main body, one end, away from the adjusting part main body, of the locating pin is in sliding clamping with the knife handle, and the other end of the locating pin can slide along with the adjusting part main body.

Further, a groove is formed in the first pushing block, the groove is provided with two chamfer surfaces, and one end, away from the adjusting part main body, of the locating pin is also clamped with the groove; the first pushing block can slide relative to the adjusting part main body, so that the two chamfer faces push the positioning pin, and the positioning pin spring is contracted.

Further, a first push block spring is arranged between the first push block and the adjusting part main body.

Further, two protruding columns are arranged on the first push block, a transverse spring groove is formed in the adjusting portion main body, the first push block spring is contained in the transverse spring groove, and the two protruding columns are respectively located at two ends of the first push block spring.

Further, a gap is arranged between the first pushing block and the second pushing block.

Further, the length of the locking groove section along the extension direction of the blade is larger than the length of the push button along the extension direction of the blade.

The technical scheme of the utility model has the following advantages:

the utility knife provided by the utility model not only realizes the function of adding the safety knife on the basis of the function of the common utility knife, but also selects the function of the utility knife or the function of the safety knife according to different requirements, thereby improving the application range of the utility knife.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a utility knife according to the present utility model;

FIG. 2 is an exploded view of the utility knife of the present utility model;

FIG. 3 is a schematic view of a blade drive assembly according to the present utility model;

FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3;

FIG. 5 is a schematic view of another orientation of the blade drive assembly of the present utility model;

FIG. 6 is an exploded view of the blade drive assembly of the present utility model of FIG. 1;

FIG. 7 is an exploded view of the blade drive assembly of the present utility model;

FIG. 8 is an exploded view of FIG. 3 of the blade drive assembly of the present utility model;

FIG. 9 is an exploded view of the blade drive assembly of the present utility model FIG. 4;

fig. 10 is a schematic structural diagram of a first push block according to the present utility model.

Wherein, in the above drawings, the reference numerals of the embodiments of the present utility model are as follows:

100. a blade; 200. a knife handle; 300. a blade drive assembly;

1. a blade mounting portion; 2. an adjusting section; 3. an elastic member;

21. an adjusting part main body; 22. a second push block; 221. the second push block sliding chute; 23. a locking structure; 231. a push button; 232. a chute; 2321. a main trough section; 2322. a locking groove section; 24. a first push block; 241. chamfering; 242. a limit structure; 25. a first pusher spring; 26. a positioning pin; 27. a positioning pin spring; 28. a protrusion; 29. a slide rail.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

The terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "extending," "retracting," and the like refer to an orientation or positional relationship based on that shown in the drawings, or that is conventionally put in place when the inventive product is used, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the utility model. The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.

The following is a detailed description of specific examples.

Referring to fig. 1, 2 and 8, the present utility model provides a utility knife, which has the functions of a safety knife added on the basis of the original utility knife functions, and selects the utility knife functions or the safety knife functions according to different requirements, thereby improving the application range of the utility knife. Specifically, the utility knife mainly comprises three parts, namely a blade 100, a knife handle 200 and a blade driving assembly 300, wherein the blade 100 is fixedly connected with one side of the blade driving assembly 300, and the blade driving assembly 300 is arranged in the knife handle 200, so that the blade driving assembly 300 can drive the blade 100 to slide and be accommodated in the space of the knife handle 200. The space in the knife handle 200 is surrounded by the tail end of the knife handle 200 and the gradually narrowed knife handle 200 outlet edge, a plurality of bayonets are distributed in the space in the knife handle 200 in an arrayed manner, and the bayonets form a preset gear position for the blade driving assembly 300 to slide.

Referring to fig. 3 to 9, the blade driving assembly 300 includes an adjusting portion 2, a blade mounting portion 1, and an elastic member 3. The adjusting part 2 is slidably and fixedly installed on the tool shank 200 at a preset gear position, and includes an adjusting part body 21, and a first push block 24 and a second push block 22 provided on the adjusting part body 21. The first push block 24 can drive the main body 21 of the adjusting portion to slide, so that the first push block 24 drives the blade 100 to synchronously extend out of the cutter handle 200 along with the adjusting portion 2 and is fixed at different preset gear positions of the cutter handle 200, thereby realizing the function of the art designing cutter. One end of the second push block 22 is fixedly connected with the blade mounting part 1, the other end is in sliding connection with the adjusting part main body 21, when the second push block 22 slides relative to the adjusting part main body 21, the blade 100 can be driven to independently extend out of the cutter handle 200, and when the second push block 22 is loosened, the blade 100 can automatically rebound and retract into the cutter handle 200, so that the function of a safety cutter is realized.

One end of the blade mounting part 1 is fixedly connected with the blade 100, and the other end is slidably connected with the adjusting part 2. When the utility knife function is used, the blade mounting part 1 slides synchronously with the adjusting part 2; when the safety knife function is used, the blade mounting portion 1 slides alone compared to the adjusting portion 2. The elastic piece 3 is positioned between the adjusting part 2 and the blade mounting part 1, and the elastic piece 3 automatically keeps the blade mounting part 1 close to the adjusting part 2; when the safety knife function is used, the second push block 22 is pushed, the knife blade 100 extends out of the knife handle 200 against the elastic force of the elastic piece 3, the second push block 22 is loosened, and the knife blade mounting part 1 drives the knife blade 100 to rebound into the knife handle 200 under the rebound action of the elastic piece 3, so that the exposed knife blade 100 is prevented from injuring a user. In this embodiment, the elastic member 3 is a tension spring.

It will be appreciated that the blade drive assembly 300 accomplishes two functions of the utility knife of the present utility model (i.e., utility knife function and safety knife function). One is to push the first push block 24, the blade 100, the blade mounting portion 1 and the adjusting portion 2 can be regarded as an integral sliding, wherein the adjusting portion 2 can stably control the blade 100 to be synchronously switched in different preset gear positions in the knife handle 200 along with the blade 100, so as to adjust the length of the blade 100 extending out of the knife handle 200 to adapt to different working conditions, which is equivalent to a normal art designing knife. The other is to push the second push block 22, the blade 100 and the blade mounting portion 1 can be regarded as a whole sliding, and the blade mounting portion 1 can enable the blade 100 to further extend towards the outlet edge based on the preset gear position of the safety knife when the adjusting portion 2 is locked at the preset gear position of the safety knife in the knife handle 200, which is equivalent to having the function of the safety knife. It should be noted that, the preset gear of the safety knife is: when the second pusher block 22 is not pushed, the blade 100 is fully retracted within the handle 200, and when the second pusher block 22 is pushed, the blade 100 may extend out of the handle 200.

Further, when using the utility knife, when cutting a target with a large resistance, such as a thick cardboard box, leather, etc., the resistance force applied to the blade 100 may exceed the tension force of the elastic member 3, so that the blade 100 further protrudes out of the handle 200, thereby affecting the use of the normal utility knife. Therefore, in order to solve the problem, the utility knife provided in the embodiment of the present utility model has the locking structure 23 provided on the adjusting portion 2, thereby realizing the function of completely closing the safety knife when the utility knife is used, enhancing the stability of the utility knife when in use, and improving the use experience of the user.

As shown in fig. 6 and 7, the locking structure 23 comprises a push button 231 provided on the second push block 22 in a snap-fit manner and a shaped chute 232 provided on the adjusting part body 21 of the adjusting part 2, the push button 231 being slidably mounted in the chute 232. The sliding groove 232 comprises a main groove section 2321 and a locking groove section 2322 which are communicated with each other, the main groove section 2321 extends along the sliding path of the second push block 22, the locking groove section 2322 is perpendicular to the main groove section 2321, and the locking groove section 2322 is located below one end of the main groove section 2321 close to the first push block 24. In other embodiments, the locking slot 2322 may also be located above an end of the main slot 2321 proximate the first push block 24, or the locking slot 2322 may be located above and below an end of the main slot 2321 proximate the first push block 24.

Specifically, the main slot 2321 is configured to allow the push button 231 to slide in the main slot 2321 along the extension direction of the blade 100, so as to drive the blade mounting portion 1 to drive the blade 100 to extend and retract in the tool holder 200, thereby realizing the function of a safety tool. The locking groove 2322 is used to lock the push button 231 to lock the positions of the blade mounting part 1 and the blade 100 with respect to the adjusting part 2, thereby completely closing the function of the safety knife when the utility knife function is used. The second push block 22 is slidable relative to the adjustment portion body 21 when the push button 231 is located in the main slot 2321, and the second push block 22 is fixable relative to the adjustment portion body 21 when the push button 231 is located in the locking slot 2322.

Further, the sliding groove 232 limits the sliding direction of the push button 231 to the direction of the utility knife and the direction perpendicular to the direction of the utility knife, when the push button 231 slides along the direction perpendicular to the direction of the utility knife, the push button is used to switch the position between the main groove 2321 and the locking groove 2322, and when the push button slides along the direction of the utility knife, the push button is used to drive the blade mounting part 1 and the blade 100 to slide relative to the adjusting part 2.

Further, as shown in fig. 3 to 9, one end of the second push block 22 is fixedly connected to the blade mounting portion 1, the other end is slidably connected to the adjusting portion main body 21 of the adjusting portion 2, and the push button 231 is engaged with the second push block 22. The second push block 22 is provided with a second push block sliding groove 221 perpendicular to the main groove section 2321, the second push block sliding groove 221 at least partially overlaps the main groove section 2321 and the locking groove section 2322, and the push button 231 is slidably accommodated in the main groove section 2321 or the locking groove section 2322 after passing through the second push block sliding groove 221. The second push block sliding slot 221 defines the push button 231 to slide longitudinally to switch between sliding in the main slot 2321 and the locking slot 2322; the main slot 2321 limits the push button 41 to slide in the extending and retracting direction of the blade 100, and the length of the slot 2321 is set to limit the sliding range of the blade mounting part 1 and the blade 100 based on the adjusting part 2, that is, the maximum extension distance of the safety knife when the safety knife function is used.

Specifically, as shown in fig. 3 to 9, the adjusting portion 2 further includes a positioning pin 26 and a positioning pin spring 27. The positioning pin spring 27 is located between the positioning pin 26 and the adjusting portion main body 21, and one end of the positioning pin 26 away from the adjusting portion main body 21 is slidably engaged with the tool shank 200, and the other end is slidably movable with the adjusting portion main body 21. The locating pin spring 27 is located between the locating pin 26 and the adjusting part main body 21, one end of the locating pin 26 away from the adjusting part main body 21 is in sliding engagement with the tool shank 200, and the other end of the locating pin can slide along with the adjusting part main body 21 and is used for fixing the adjusting part 2 at different preset gear positions of the tool shank 200 through bayonet fitting with the tool shank 200.

The first push block 24 is slidably disposed on the adjusting portion main body 21, and a gap is provided between the first push block 24 and the second push block 22, so that when the first push block 24 slides towards the outlet edge, the positioning pin 26 is compressed into the adjusting portion main body 21 to enable the adjusting portion 2 to slide towards the outlet edge in the tool shank 200. In the present embodiment, when the push button 231 is located in the main slot 2321, the main slot 2321 is a gap between the first push block 24 and the second push block 22, and the first push block 24 can slide along the main slot 2321; when the push button 231 is located in the locking slot 2322, the length of the locking slot 2322 along the extension direction of the blade is set to be greater than the length of the push button 231 along the extension direction of the blade, and the gap between the locking slot 2322 and the push button 231 is the gap between the first push block 24 and the second push block 22. By the arrangement, the gap between the first push block 24 and the second push block 22 cannot be seen from the outer surface of the art knife, so that the appearance is smoother and more attractive, and dust is not easy to accumulate.

As shown in fig. 6 to 9, the adjusting portion 2 further includes a first push block spring 25, the first push block spring 25 being disposed between the adjusting portion main body 21 and the first push block 24. Specifically, the adjusting portion main body 21 is provided with a transverse spring groove, the first push block spring 25 is mounted in the transverse spring groove, and the limiting structure 242 includes two protruding columns, which are respectively located at two ends of the first push block spring 25 when the first push block 24 is movably fastened to the adjusting portion main body 21. When the first push block 24 is pushed forward, the protruding columns at the rear side press the first push block springs 25 to compress until the first push block is incompressible, and the first push block 24 is loosened to realize backward rebound of the first push block 24; when the first push block 24 is pushed backwards, the protruding columns on the front side press the first push block springs 25 to compress, and the first push block 24 is loosened, so that the first push block 24 rebounds forwards; in this way, the first push block 24 performs a lateral rebound reset slide.

Further, the lower end of the positioning pin 26 is assembled on the adjusting part main body 21 through a positioning pin spring 27, a groove is formed in the first push block 24, the groove is provided with two chamfer surfaces 241 matched with one side of the positioning pin 26, and one end of the positioning pin 26 away from the adjusting part main body 21 is also clamped with the groove; the first pushing block 24 can slide relative to the adjusting part main body 21, so that the two chamfer surfaces 241 push the positioning pin 26, and the positioning pin spring 27 contracts to drive the positioning pin 26 to move up and down. Specifically, as shown in fig. 10, the chamfer 241 of the first push block 24 is a curved surface having one high point and two low points, and the first push block 24 slides to switchably position the positioning pin 26 at the high point and the left and right low points; when the positioning pin 26 is positioned at the high point, the part of the positioning pin 26 facing the main body 21 of the adjusting part stretches into the bayonet of the tool holder 200 to be matched, so that the adjusting part 2 is locked at a preset gear position in the corresponding tool holder 200; when the positioning pin 26 is positioned at the left and right low points, the positioning pin 26 is displaced downward, and the part of the positioning pin 26 facing the adjusting part main body 21 is retracted into the adjusting part main body 21 from the bayonet of the cutter handle 200, and at this time, the first push block 24 is pushed in the extending and contracting direction of the blade 100 to slide the position of the adjusting part 2 in the cutter handle 200. It will be appreciated that because the first pusher spring 25 is manually slid forward or back and forth and then retains the force of restoring the deformation, there is always a force to return the first pusher 24 to the high position, and thus the first pusher 24 is released when the user slides the adjustment portion 2 to the preset gear position in the tool holder 200, the chamfer 241 of the first pusher 24 slides to cause the detent pin 26 to fall into the high position, thereby achieving locking of the preset gear position of the adjustment portion 2 in the tool holder 200.

Further, the adjusting portion main body 21 is provided with a vertical spring groove in which the positioning pin spring 27 and the positioning pin 26 are fitted. Wherein the upper end of the vertical spring groove is opened, and the positioning pin 26 can extend out of the adjusting part main body 21 from the upper end opening of the vertical spring groove under the action of the positioning pin spring 27 and is clamped with the bayonet of the knife handle 200. Specifically, the portion of the positioning pin 26 facing the adjusting portion main body 21 is embedded in the vertical spring groove and can extend into the bayonet of the tool holder 200 to be engaged; the other part of the locating pin 26 facing the first push block 24 exceeds the surface of the vertical spring slot and may be in contact with the chamfer 241 of the first push block 24.

As shown in fig. 9, a guiding mechanism is arranged between the adjusting portion 2 and the side of the blade mounting portion 1 facing away from the sliding groove 232, the guiding mechanism is composed of a protrusion 28 and a sliding rail 29, one of the protrusion 28 and the sliding rail 29 is arranged on the adjusting portion 2, the other one of the protrusion 28 and the sliding rail 29 is arranged on the blade mounting portion 1, and the protrusion 28 and the sliding rail 29 are used for being matched with each other to guide the sliding direction between the blade mounting portion 1 and the adjusting portion 2, so that the blade mounting portion 1 slides along the adjusting portion 2.

As another modification of the embodiment of the present utility model, a gap is provided between the first push block 24 and the second push block 22 for restricting the slidable direction of the adjusting portion 2 to the left and right directions when the blade mounting portion 1 and the blade 100 are locked. Specifically, when the push button 231 is pushed into the locking chute 232 of the chute 232, that is, when the blade mounting portion 1 and the blade 100 are in the full art knife function, the length of the locking chute 232 is controlled such that the push button 231 cannot slide left and right, and at this time, the blade mounting portion 1 and the blade 100 are also fixed and cannot slide left and right. At this time, because a gap is provided between the first push block 24 and the second push block 22, the first push block 24 can be pushed left and right to control the blade 100 to slide synchronously with the adjusting portion 2 and be located at different preset gear positions of the tool shank 200.

As another modification of the embodiment of the present utility model, the first push block 24 is attached to the second push block 22, the length of the locking groove 2322 along the extension direction of the blade 100 is greater than the length of the push button 231 along the extension direction of the blade 100, preferably, the length of the locking groove 2322 is 3 mm longer than the length of the push button 231, so that a gap exists between the locking groove 2322 and the push button 231. For restricting the slidable direction of the adjusting portion 2 to two directions, i.e., left and right, when the blade mounting portion 1 and the blade 100 are locked. Specifically, when the push button 231 is pushed into the locking slot 2322 of the slot 232, that is, when the blade mounting portion 1 and the blade 100 are in the full art knife function, the length of the locking slot 2322 is controlled, the push button 231 can still slide back and forth by a distance of 3 mm, and the distance of the back and forth sliding is determined by the length of the locking slot 2322 minus the length of the push button 231. When the push button 231 is at the locking position, the first push block 24 can be pushed left and right to control the blade 100 to slide synchronously with the adjusting portion 2 and be located at different preset gear positions of the tool holder 200.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.

Claims (9)

1. An art designing knife, includes handle of a knife, blade and blade drive assembly, its characterized in that: the blade driving assembly comprises an adjusting part, a blade mounting part and an elastic piece positioned between the adjusting part and the blade mounting part, wherein the adjusting part is slidably and fixedly arranged on the cutter handle in a preset gear position, one end of the blade mounting part is fixedly connected with the blade, and the other end of the blade mounting part is slidably connected with the adjusting part; the adjusting part comprises an adjusting part main body, a first pushing block and a second pushing block, wherein the first pushing block and the second pushing block are arranged on the adjusting part main body, one end of the second pushing block is fixedly connected with the blade mounting part, the other end of the second pushing block is in sliding connection with the adjusting part main body, the second pushing block is pushed to enable the blade to extend out of the cutter handle, and the second pushing block is released to enable the blade to retract into the cutter handle; the adjusting part further comprises a locating pin and a locating pin spring, wherein the locating pin spring is located between the locating pin and the adjusting part main body, one end, away from the adjusting part main body, of the locating pin is in sliding clamping with the knife handle, and the other end of the locating pin can slide along with the adjusting part main body.

2. The utility knife according to claim 1, wherein the adjusting part is further provided with a locking structure comprising a push button arranged on the second push block in a clamping manner and a sliding groove arranged on the main body of the adjusting part, and the push button is slidably arranged in the sliding groove; the sliding groove comprises a main groove section and a locking groove section, when the push button is positioned in the main groove section, the second push block can slide relative to the main body of the adjusting part, and when the push button is positioned in the locking groove section, the second push block can be fixed relative to the main body of the adjusting part.

3. The utility knife of claim 2, wherein the main channel section is in communication with the locking channel section, the main channel section extending along the sliding path of the second pusher, the locking channel section being perpendicular to the main channel section.

4. A utility knife according to claim 3, wherein the locking slot section is located below an end of the main slot section adjacent the first push block.

5. The utility knife of claim 1, wherein the first push block is provided with a groove, the groove is provided with two chamfer surfaces, and one end of the positioning pin, which is far away from the main body of the adjusting part, is also clamped with the groove; the first pushing block can slide relative to the adjusting part main body, so that the two chamfer faces push the positioning pin, and the positioning pin spring is contracted.

6. The utility knife of claim 1, wherein a first pusher spring is disposed between the first pusher and the adjustment body.

7. The utility knife of claim 6, wherein the first push block is provided with two protruding columns, the adjusting part main body is provided with a transverse spring groove, the first push block spring is accommodated in the transverse spring groove, and the two protruding columns are respectively positioned at two ends of the first push block spring.

8. The utility knife of claim 1, wherein a gap is provided between the first push block and the second push block.

9. The utility knife of claim 2, wherein the length of the locking slot section in the direction of blade extension is greater than the length of the push button in the direction of blade extension.