Telescopic art knife

Abstract

The utility model discloses a telescopic art knife which comprises a blade, a blade fixing seat and a handle body, the blade fixing seat is provided with a sliding control mechanism, the sliding control mechanism comprises a sliding guide piece, a control piece and a first locking piece, the sliding guide piece is fixedly connected with the blade fixing seat, and the front side face of the handle body is provided with a first sliding guide groove penetrating through the front side face of the handle body. The sliding guide part is arranged in the first sliding guide groove and can slide along the first sliding guide groove, the first locking part is connected with the control part, locking parts matched with the first locking part are arranged in the handle body, the number of the locking parts is at least two, the control part is arranged to be capable of moving relative to the sliding guide part, and the top of the control part extends out of the top face of the sliding guide part. When the control piece moves, the first locking piece and the locking part can be controlled to be locked and unlocked in a matched mode. The utility model has the beneficial effects that the blade fixing seat can slide only after the control piece is pressed for unlocking, and the blade is completely accommodated in the sliding cavity of the handle body during carrying, so that the safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of cutter tools, and more specifically, particularly relates to a telescopic utility knife. Background Art

[0002] Utility knives are commonly used cutting tools, generally used for cutting paper, cloth, plastic and other materials. Utility knives currently sold on the market generally consist of a blade, a blade holder and a handle. The blade is placed in the blade holder and can be replaced, and the blade holder is provided with a locking mechanism for locking the blade.

[0003] Utility knives can be roughly divided into two categories according to the way the blade seat is opened, one is a folding utility knife, and the other is a telescopic utility knife.

[0004] For example, the Chinese utility model patent with patent number 202120198621.0 and invention name "A new type of retractable utility knife" discloses the following technical solution: it includes a blade cover with stripes, a blade clamp, a blade tail, and a blade, the blunt edge of the blade is clamped in the blade clamp, the blade tail is a hollow structure with an open end, one end of the blade clamp is sleeved in the blade tail, the blade clamp is fixedly connected to the blade tail, the blade cover is a hollow structure with openings at both ends, the blade cover is sleeved outside the blade tail, the blade cover is slidably connected to the blade tail left and right, an elastic member is provided on the blade tail, the elastic member drives the blade cover away from the blade tail, a blocking member is provided on the blade tail, the blocking member stops the blade cover from sliding to the left, and the blocking member causes the blade cover to cover the blade.

[0005] The above technical solution, when in use, pushes the cutter head cover to the right, the cutter head cover slides and leaks out the blade, and when the hand is released, the cutter head cover returns to the initial position under the action of the spring to cover the blade, thus avoiding the problem of people randomly placing the utility knife and causing scratches on the exposed blade. Although the safety is relatively good, there are also shortcomings. For example, after the hand is released, the cutter head cover will return to the initial position under the action of the spring to cover the blade. When it is necessary to maintain the blade leaking out for use, it is necessary to keep the state of the cutter head cover by hand, which is easy to cause sore hands in actual use. In addition, because the blade is leaked out by pushing the cutter head cover to the right, although there is a safety mechanism to prevent the cutter head cover from being pushed to the right, that is, the block of the cutter head cover and the upper spring sheet of the blade clamp cooperate to prevent the cutter head cover from moving to the right in the pocket under slight force and leaking out the blade to injure people, however, in the case of relatively large external force, the upper spring sheet is easily damaged, thereby losing the function of preventing the cutter head cover from moving to the right in the pocket under slight force and leaking out the blade to injure people. Summary of the invention

[0006] The invention of the utility model aims to solve the above-mentioned technical problems and aims to provide a telescopic utility knife with simple structure, convenient blade replacement, good safety and stable performance.

[0007] The utility model is achieved through the following technical solutions.

[0008] The utility model provides a telescopic utility knife, comprising a blade, a blade fixing seat and a handle body, wherein the blade is installed in the blade fixing seat, the blade fixing seat is provided with a blade locking mechanism and is installed in a sliding cavity provided in the handle body, the blade fixing seat is provided with a sliding control mechanism, the sliding control mechanism comprises a guide slide, a control member and a first locking member, the guide slide is connected and fixed to the blade fixing seat, and the guide slide is provided with a slot for accommodating the control member and the first locking member, the front side surface of the handle body is provided with a first guide slide groove that runs through the front side surface of the handle body and is in the same direction as the extension direction of the handle body length, the guide slide member is placed in the first guide slide groove and cooperates with the first guide slide groove to slide along the first guide slide groove, the first locking member is connected to the control member, the control member is arranged to be able to move relative to the guide slide member and the top of the control member extends outside the top surface of the guide slide member, a locking part that cooperates with the first locking member is provided in the handle body, the number of the locking parts is at least two, so that the blade can be locked in cooperation with the first locking member when the blade is completely retracted into the handle body and the blade extends out of the handle body, and the first locking member can be controlled to cooperate with the locking part to lock and unlock when the control member moves.

[0009] In the above technical solution, when the blade is in the fully extended or fully extended position relative to the handle body, the blade fixing seat can slide only after the control member is operated to unlock the first locking member and the locking portion, which is highly safe. When the user operates the control member to unlock the first locking member and the locking portion, the user can simultaneously operate the sliding member to slide the blade fixing seat, which can be operated with one hand, and the blade fixing seat can be easily slid.

[0010] Preferably, the control member is configured to be movable in a direction perpendicular to the top surface of the guide slide member, and the top surface of the guide slide member is provided with an avoidance hole for accommodating the control member to pass through at a position corresponding to the control member, and the bottom of the control member is provided with a first elastic member that provides elastic force for the control member to reset upward. In this technical solution, the first locking member and the locking portion can be unlocked by pressing the control member with the thumb. After the first locking member and the locking portion are unlocked, the thumb can push the guide slide member to make the blade fixing seat slide relative to the handle body. The operation is simple and convenient. After the blade fixing seat reaches the front and rear ends of the first guide groove, that is, when the blade is completely extended out of the handle body and completely extended into the handle body, the control member is released. Under the elastic force of the first elastic member, the first locking member can cooperate with the locking portion to lock, and the blade fixing seat cannot slide at this time, which has good safety.

[0011] Preferably, the bottom of the control member is connected and fixed to the middle of the first locking member, and the maximum outer diameter of the control member is set to be smaller than the length of the first locking member, and the length of the first locking member is set to be larger than the width of the first guide slot, the top end of the first elastic member abuts against the bottom surface of the first locking member, and the bottom end abuts against the surface of the blade fixing seat. In the present technical solution, the maximum outer diameter of the control member is set to be smaller than the length of the first locking member, so that the first locking member cannot pass through the avoidance hole provided on the top surface of the guide slide, and the control member can be prevented from detaching from the guide slide. The length of the first locking member is set to be larger than the width of the first guide slot, which can facilitate the position of the locking portion and the cooperation between the first locking member and the locking portion.

[0012] Preferably, a positioning groove for accommodating the first elastic member is provided in the middle of the bottom surface of the first locking member, and the top of the first elastic member abuts against the bottom of the positioning groove. In the technical solution, the top of the first elastic member abuts against the bottom of the positioning groove, and when the control member is pressed to compress the first elastic member, the position of the first elastic member can be prevented from being offset during compression to affect the reset effect, or even the first elastic member can be prevented from flying off.

[0013] Preferably, the inner wall of the handle body is provided with a groove cooperating with the first locking member on the periphery of the first guide groove, and the first locking member can slide along the groove, and the locking portion is a card groove provided at the bottom of the groove. In this technical solution, the first locking member is located in the groove and will not affect the sliding of the blade fixing seat. The locking portion is provided at the bottom of the groove. When the first locking member slides to the corresponding position, if the control member is not acted upon by external force, the first locking member can be automatically engaged with the locking portion under the elastic force of the first elastic member, and the structure is simple and practical.

[0014] Preferably, the top surface of the guide member is provided with uneven anti-skid stripes, so that the thumb of the user can better push the guide member while pressing the control member to avoid slipping.

[0015] Preferably, the blade fixing seat comprises a front sealing plate, a base plate and a rear sealing plate, the front sealing plate and the rear sealing plate are respectively arranged on the front side and the rear side of the base plate and are connected and fixed to the base plate by screws, the front side of the base plate is provided with a blade slot for placing a blade, the back of the blade is provided with a retaining slot cooperating with a blade locking mechanism, the rear side of the base plate is provided with an installation slot, and the blade locking mechanism is arranged in the installation slot. In this technical solution, the blade fixing seat adopts a split structure, which is convenient for processing and assembly.

[0016] Preferably, the blade locking mechanism includes a pushing member, a lever member, a locking member and a second elastic member, the pushing member is arranged perpendicular to the rear sealing plate and one end of the pushing member is connected and fixed to the rear end of the lever member, the other end of the pushing member extends outside the rear sealing plate, the front part of the lever member is pivotally connected to the base plate through a connecting nail, the front end of the lever member is connected to the locking member through a connecting mechanism so that the locking member can be driven to move when the lever member moves, the locking member is provided with a locking portion on the side facing the base plate, the base plate is provided with an avoidance groove at a position corresponding to the stopper, the stopper passes through the avoidance groove and cooperates with the stopper groove of the blade, the second elastic member is arranged below the lever member, one end of the second elastic member abuts against the lower side of the lever member, and the other end abuts against the lower groove wall of the mounting groove, the rear side surface of the handle body is provided with a second guide slide groove that penetrates the rear side surface of the handle body and is in the same direction as the extension direction of the length of the handle body and cooperates with the pushing member at the position corresponding to the pushing member, the front end of the second guide slide groove is provided with an operating port connected to the second guide slide groove, and when the pushing member is located at the operating port, the pushing member can drive the lock member to move so that the stopper part is disengaged from the stopper groove. In the present technical scheme, the pushing member cooperates with the second guide groove to improve the stability of the blade fixing seat when it slides relative to the handle body, and the pushing member cannot be operated during the sliding process relative to the second guide groove, and the blade will not separate from the blade fixing seat, which can effectively avoid the blade from accidentally separating from the blade fixing seat and being lost due to misoperation. When the pushing member reaches the operating port at the front end of the second guide groove, the pushing member can be pushed to make the locking portion separate from the locking groove to unlock the blade. The blade can be replaced conveniently and safely. After releasing the pushing member, under the elastic force of the second elastic member, the locking portion will automatically lock into the locking groove of the blade to lock the blade.

[0017] Preferably, the connection mechanism includes a notch provided on the side of the lock member facing the lever member, and an insertion portion provided at the front end of the lever member, and the insertion portion is inserted into the notch. In the technical solution, the structure of the insertion portion inserted into the notch is simple, and when the lever member rotates, the lock member can be driven to rise or fall, so that the locking portion is separated from the locking groove or locked into the locking groove.

[0018] Preferably, the handle body includes a front shell and a rear shell, the front shell is connected and fixed to the rear shell by screws, the first guide slot is provided on the front shell, and the second guide slot is provided on the rear shell. In this technical solution, the handle body adopts a split structure, which is convenient for processing the structure of the handle body itself and assembling various components.

[0019] The beneficial effects of the present invention lie in that, through the cooperation of the sliding control mechanism and the first guide slot, when the blade is needed, the control member is pressed to unlock it, and then the blade fixing seat is pushed to slide relative to the handle body so that the blade is extended out of the handle body, and the blade fixing seat will not slide accidentally, which has high safety; when the blade is not needed, the blade is completely stored in the sliding cavity of the handle body, the handle body has high strength and strong force-bearing capacity, and there is no possibility of the handle body being damaged and touching the blade, which has high safety when carried; the pushing member and the second guide slot cooperate with each other to have a dual function, firstly, it can improve the stability of the blade fixing seat when sliding, and secondly, the blade can be unlocked and replaced only after the blade fixing seat slides to a specific position, which can effectively avoid the loss of the blade caused by misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model when the blade is fully extended out of the handle;

[0021] Figure 2 It is a schematic diagram of the structure of the handle of the utility model when it is disassembled;

[0022] Figure 3 This is a schematic diagram of the internal structure of the front housing of the utility model;

[0023] Figure 4 The exploded structure of the blade fixing seat of the utility model is shown in FIG. Figure 1 ;

[0024] Figure 5 The exploded structure of the blade fixing seat of the utility model is shown in FIG. Figure 2 ;

[0025] Figure 6 It is a schematic diagram of the exploded structure of the sliding control mechanism of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the blade fixing seat of the utility model with the front sealing plate and the rear sealing plate omitted;

[0027] Figure 8 This is a schematic diagram of the structure of the blade locking mechanism of the utility model;

[0028] Fig. 9 It is a schematic structural diagram of the utility model in the direction of the rear housing when the blade is fully extended out of the handle. DETAILED DESCRIPTION

[0029] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown, the utility model provides a telescopic utility knife, comprising a blade 1, a blade fixing seat 2 and a handle body 3, wherein the blade 1 is installed in the blade fixing seat 2, the blade fixing seat 2 is provided with a blade locking mechanism and is installed in a sliding cavity 33 provided in the handle body 3, wherein the handle body 3 comprises a front shell 31 and a rear shell 32, the front shell 31 is connected and fixed to the rear shell 32 by screws, and the sliding cavity 33 is jointly surrounded by the front shell 31 and the rear shell 32.

[0034] like Figure 1 , Figure 2 and Figure 6As shown, in this embodiment, the blade fixing seat 2 is provided with a sliding control mechanism, which includes a guide slide 41, a control member 42 and a first locking member 43. The guide slide 41 is connected to the blade fixing seat 2 by screws and is fixed on the outer surface of the blade fixing seat 2, and the guide slide 41 is provided with a slot 412 for accommodating the control member 42 and the first locking member 43. The front housing 31 is provided with a first guide slide groove 311 that penetrates the front housing 31 and is in the same direction as the length extension direction of the front housing 31. The guide slide 41 is placed in the first guide slide groove 311 and can slide along the first guide slide groove 311 in cooperation with the first guide slide groove 311. The first locking member 43 is connected to the control member 42. The control member 42 is configured to be movable relative to the guide slide 41 and the top of the control member 42 extends outside the top surface of the guide slide 41. The inner wall of the front housing 31 is provided with a locking portion 313 that cooperates with the first locking member 43. When the control member 42 moves, the first locking member 43 can be controlled to cooperate with the locking portion 313 to lock and unlock. like Figure 3 As shown, the inner wall of the front shell body 31 is provided with a circle of grooves 312 cooperating with the first locking piece 43 on the periphery of the first guide groove 311, and the first locking piece 43 can slide along the grooves 312, and the locking portion 313 is a card slot arranged at the bottom of the groove 312, and a total of three groups of card slots are provided. The positions of the three groups of card slots correspond to the positions where the blade 1 is fully extended out of the handle body 3, the blade 1 is half extended out of the handle body 3, and the blade 1 is fully extended into the handle body 3, respectively. Each group of card slots includes two card slots symmetrically arranged on both sides of the first guide groove 311. When the blade 1 is fully extended out of the handle body 3, the first locking piece 43 cooperates with the card slot at the front end of the first guide groove 311. When the blade 1 is half extended out of the handle body 3, the first locking piece 43 cooperates with the card slot in the middle of the first guide groove 311. When the blade 1 is fully extended into the handle body 3, the first locking piece 43 cooperates with the card slot at the rear end of the first guide groove 311.

[0035] like Figure 4 and Figure 6As shown, in this embodiment, the guide slide 41 is a block-shaped body, the top surface of the guide slide 41 is provided with uneven anti-skid stripes, the middle position of the lower half of the guide slide 41 is hollowed out to form a slot 412 for accommodating the control member 42 and the first locking member 43, the control member 42 is a columnar body, and the first locking member 43 is a plate-shaped body, wherein the control member 42 is arranged perpendicular to the top surface of the guide slide 41, and the top surface of the guide slide 41 is provided with an avoidance hole 411 for accommodating the control member 42 to pass through at a position corresponding to the control member 42, and the bottom of the control member 42 is aligned with the first locking member 43. The middle part of 43 is connected and fixed, and the maximum outer diameter of the control member 42 is set to be smaller than the length of the first locking member 43, and the length of the first locking member 43 is set to be larger than the width of the first guide groove 311, so that the first locking member 43 cannot pass through the avoidance hole 411 provided on the top surface of the guide groove 311, which can prevent the control member 42 from detaching from the guide groove 41. The length of the first locking member 43 is set to be larger than the width of the first guide groove 311, which can facilitate the position of the locking part 313 and the cooperation between the first locking member 43 and the locking part 313.

[0036] A first elastic member 44 is provided at the bottom of the first locking member 43 to provide elastic force for the control member 42 to reset upward. The first elastic member 44 is a compression spring. The top end of the first elastic member 44 abuts against the bottom surface of the first locking member 43, and the bottom end abuts against the surface of the blade fixing seat 2.

[0037] like Figure 6 As shown, as a further improvement, a positioning groove 431 for accommodating the first elastic member 44 is provided in the middle of the bottom surface of the first locking member 43, and the top of the first elastic member 44 is abutted against the bottom of the positioning groove 431. In this way, when the control member 42 is pressed to compress the first elastic member 44, the position of the first elastic member 44 is prevented from being offset during compression to affect the reset effect, or even the first elastic member 44 is prevented from bouncing off.

[0038] Implementation 2

[0039] The structure of this embodiment is similar to that of embodiment 1, except that Figure 4 , Figure 5 and Figure 7 As shown, the blade fixing seat 2 includes a front sealing plate 22, a base plate 21 and a rear sealing plate 23. The front sealing plate 22 and the rear sealing plate 23 are respectively arranged on the front and rear sides of the base plate 21 and are connected and fixed to the base plate 21 by screws. The front side of the base plate 21 is provided with a blade slot 211 for placing the blade 1, and the back of the blade 1 is provided with a retaining groove 11 that cooperates with the blade locking mechanism. The rear side of the base plate 21 is provided with a mounting groove 212, and the blade locking mechanism is arranged in the mounting groove 212.

[0040] Example 3

[0041] The structure of this embodiment is similar to that of embodiment 2, except that: Figure 7 and Figure 8 As shown, the blade locking mechanism includes a pushing member 51, a lever member 52, a locking member 53 and a second elastic member 54. The pushing member 51 is arranged perpendicular to the rear sealing plate 23 and one end of the pushing member 51 is connected and fixed to the rear end of the lever member 52. The other end of the pushing member 51 extends to the outside of the rear sealing plate 23. The front part of the lever member 52 is pivotally connected to the base plate 21 through a connecting nail 55. The front end of the lever member 52 is connected to the locking member 53 through a connecting mechanism so that the locking member 53 can be driven to move when the lever member 52 moves. The locking member 53 is provided with a locking portion 531 on the side facing the base plate 21. The base plate 21 is provided with an avoidance groove 213 at a position corresponding to the locking portion 531. The locking portion 531 passes through the avoidance groove 213 and cooperates with the locking groove 11 of the blade 1. The second elastic member 54 is arranged below the lever member 52. One end of the second elastic member 54 abuts against the lower side of the lever member 52, and the other end abuts against the lower groove wall of the mounting groove 212. As shown Figure 2 and Fig. 9 As shown, the rear shell body 32 is provided with a second guide groove 321 which cooperates with the pushing member 51 and passes through the rear shell body 32 and is in the same direction as the length extension direction of the rear shell body 32 at the position corresponding to the pushing member 51, and the front end of the second guide groove 321 is provided with an operating port 322 which is connected to the second guide groove 321. When the pushing member 51 is located at the operating port 322, the pushing member 51 can drive the locking member 53 to move so that the locking portion 531 disengages from the locking groove 11.

[0042] like Figure 8 As shown, in this embodiment, the connecting mechanism includes a notch 532 provided on the side of the locking member 53 facing the lever member 52, and an insertion portion 521 provided at the front end of the lever member 52. The insertion portion 521 is inserted into the notch 532 and cooperates with the support. When the lever member 52 rotates, the insertion portion 521 drives the locking member 53 to rise or fall, thereby realizing that the locking portion 531 is disengaged from the locking groove 11, or the locking portion 531 is locked into the locking groove 11.

[0043] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A telescopic utility knife, comprising a blade (1), a blade fixing seat (2) and a handle (3), wherein the blade (1) is mounted in the blade fixing seat (2), the blade fixing seat (2) is provided with a blade locking mechanism and is mounted in a sliding cavity (33) provided in the handle (3), characterized in that: The blade fixing seat (2) is provided with a sliding control mechanism, which comprises a guide slide member (41), a control member (42) and a first locking member (43); the guide slide member (41) is connected and fixed to the blade fixing seat (2) and the guide slide member (41) is provided with a slot (412) for accommodating the control member (42) and the first locking member (43); the front side surface of the handle body (3) is provided with a first guide slide groove (311) which penetrates the front side surface of the handle body (3) and is in the same direction as the length extension direction of the handle body (3); the guide slide member (41) is placed in the first guide slide groove (311) and cooperates with the first guide slide groove (311) to slide along the first guide slide groove (311) The first locking member (43) is connected to the control member (42), the control member (42) is configured to be movable relative to the guide slide (41) and the top of the control member (42) extends beyond the top surface of the guide slide (41), a locking portion (313) cooperating with the first locking member (43) is provided in the handle body (3), the number of the locking portions (313) is at least two, so that the blade (1) can be locked in cooperation with the first locking member (43) when the blade (1) is completely retracted into the handle body (3) and when the blade (1) extends out of the handle body (3), and when the control member (42) moves, the first locking member (43) can be controlled to cooperate with the locking portion (313) to lock and unlock.

2. The telescopic utility knife according to claim 1, characterized in that: The control member (42) is arranged to be movable in a direction perpendicular to the top surface of the guide slide member (41); the top surface of the guide slide member (41) is provided with an escape hole (411) for accommodating the control member (42) to pass through at a position corresponding to the control member (42); and the bottom of the control member (42) is provided with a first elastic member (44) for providing elastic force for the control member (42) to return upward.

3. The telescopic utility knife according to claim 2, characterized in that: The bottom of the control member (42) is connected and fixed to the middle of the first locking member (43), and the maximum outer diameter of the control member (42) is set to be smaller than the length of the first locking member (43), and the length of the first locking member (43) is set to be larger than the width of the first guide groove (311), and the top end of the first elastic member (44) is against the bottom surface of the first locking member (43), and the bottom end is against the surface of the blade fixing seat (2).

4. The telescopic utility knife according to claim 3, characterized in that: A positioning groove (431) for accommodating the first elastic member (44) is provided in the middle of the bottom surface of the first locking member (43), and the top end of the first elastic member (44) abuts against the bottom of the positioning groove (431).

5. The telescopic utility knife according to claim 3, characterized in that: The inner wall of the handle body (3) is provided with a groove (312) cooperating with the first locking piece (43) on the periphery of the first guide groove (311), and the first locking piece (43) can slide along the groove (312), and the locking portion (313) is a slot provided at the bottom of the groove (312).

6. The telescopic utility knife according to claim 1, characterized in that: The top surface of the sliding guide (41) is provided with uneven anti-slip stripes.

7. The telescopic utility knife according to any one of claims 1 to 6, characterized in that: The blade fixing seat (2) comprises a front sealing plate (22), a base plate (21) and a rear sealing plate (23); the front sealing plate (22) and the rear sealing plate (23) are respectively arranged on the front side and the rear side of the base plate (21) and are connected and fixed to the base plate (21) by screws; the front side of the base plate (21) is provided with a blade slot (211) for placing the blade (1); the back of the blade (1) is provided with a locking slot (11) cooperating with a blade locking mechanism; the rear side of the base plate (21) is provided with a mounting slot (212), and the blade locking mechanism is arranged in the mounting slot (212).

8. The telescopic utility knife according to claim 7, characterized in that: The blade locking mechanism comprises a pushing member (51), a lever member (52), a locking member (53) and a second elastic member (54); the pushing member (51) is arranged perpendicular to the rear sealing plate (23) and one end of the pushing member (51) is connected and fixed to the rear end of the lever member (52); the other end of the pushing member (51) extends outside the rear sealing plate (23); the front part of the lever member (52) is pivotally connected to the base plate (21) through a connecting pin (55); the front end of the lever member (52) is connected to the locking member (53) through a connecting mechanism so as to drive the locking member (53) to move when the lever member (52) moves; a locking portion (531) is provided on a side of the locking member (53) facing the base plate (21); the base plate (21) is provided with an avoidance groove (213) at a position corresponding to the locking portion (531); the locking portion (531) The second elastic member (54) passes through the avoidance groove (213) and cooperates with the locking groove (11) of the blade (1). The second elastic member (54) is arranged below the lever member (52). One end of the second elastic member (54) abuts against the lower side of the lever member (52), and the other end abuts against the lower groove wall of the mounting groove (212). The rear side surface of the handle body (3) is provided with a second guide groove (321) that cooperates with the pushing member (51) and passes through the rear side surface of the handle body (3) and is in the same direction as the length extension direction of the handle body (3). The front end of the second guide groove (321) is provided with an operating port (322) that is connected to the second guide groove (321). When the pushing member (51) is located at the operating port (322), the pushing member (51) can drive the locking member (53) to move so that the locking portion (531) is separated from the locking groove (11).

9. The telescopic utility knife according to claim 8, characterized in that: The connection mechanism comprises a notch (532) provided on one side of the lock member (53) facing the lever member (52), and an insertion portion (521) provided at the front end of the lever member (52), wherein the insertion portion (521) is inserted into the notch (532).

10. The telescopic utility knife according to claim 8, characterized in that: The handle body (3) comprises a front shell (31) and a rear shell (32); the front shell (31) is connected and fixed to the rear shell (32) by screws; the first guide groove (311) is arranged on the front shell (31); and the second guide groove (321) is arranged on the rear shell (32).

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