Retractable knife

Abstract

The present invention relates to a retractable knife, comprising a knife holder, a knife body, and a connecting rod assembly. A receiving cavity having one end open is formed in the knife holder; a slide rail is provided in the receiving cavity; the slide rail has a stroke center position; the knife body is movably disposed on the slide rail; the connecting rod assembly comprises connecting rods and a first elastic member; the connecting rods are movably provided in the receiving cavity and rotatably connected to the knife body; the connecting rods re elastically connected to the first elastic member; under the action of an external force, the knife body slides along the slide rail; before the knife body passes the stroke center position, the first elastic member is compressed to accumulate an elastic force; and when the knife body passes the stroke center position, the first elastic member releases the elastic force to push the knife body to slide until the knife body is in an extended state or a retracted state. The retractable knife provided in the present application simplifies the knife opening and closing operation, achieves rapid extension and retraction of the knife body by means of simple pushing and pressing, thereby improving the operation efficiency of the knife.

Description

[Amended according to Rule 26 28.07.2025] A telescopic knife TECHNICAL FIELD

[0001] The present application relates to the technical field of knives, in particular to a telescopic knife. BACKGROUND

[0002] The existing handheld knives are mainly divided into sheath type, rotary folding type and track push-pull type structures. These designs can meet the daily cutting needs to a certain extent, but they have significant common defects in opening and closing operations. The sheath type knife usually needs to be manually pulled out of the sheath and inserted into the sheath, which not only increases the operation time, but also affects the work efficiency when the opening and closing states need to be quickly switched, and it is difficult to adapt to various use scenarios and needs. The rotary folding type knife provides a way to open and close by rotating, but it requires the operator to have certain operation skills and the parts to be rotated in place to complete the opening and closing, which is slow and not suitable for situations that require quick response. The track push-pull type knife provides a way to open and close by manually pushing and pulling, but the process of manually pushing and pulling the knife body out or back in takes a long time and cannot meet the demand for quick opening and closing of the knife.

[0003] The opening and closing operations of the above three types of knives are low in efficiency, which not only increases the time cost of using the knife, but also makes the existing knives unable to meet the high efficiency requirement in use scenarios that require frequent and quick switching of the opening and closing state of the knife. SUMMARY

[0004] An object of the present application is to provide a telescopic knife to solve the problem of low efficiency of opening and closing operation of the existing knife.

[0005] A telescopic knife, comprising:

[0006] a knife seat formed with a containing cavity with one end open, a slide rail is arranged in the containing cavity, the slide rail has a stroke center position, the stroke center position divides the slide rail into a first slide rail and a second slide rail connected in series;

[0007] a knife body movably arranged in the slide rail, the knife body has an out-knife state of extending out of the opening and a in-knife state of retracting into the containing cavity;

[0008] a connecting rod assembly comprising a connecting rod and a first elastic member, the connecting rod is movably arranged in the containing cavity and rotationally connected with the knife body, and the connecting rod is elastically connected with the first elastic member;

[0009] Under the action of external force, the blade body slides along the slide rail, before the blade body passes the stroke center position, the first elastic member is compressed to accumulate elastic force, when the blade body passes the stroke center position, the first elastic member releases the elastic force to push the blade body to slide to the knife-out state or the knife-in state.

[0010] In one of the embodiments, the blade body and the slide rail are both arc-shaped; one side of the blade seat is provided with a guide groove, the guide groove is communicated with the opening, one side of the blade body is provided with a protrusion, the protrusion passes through the guide groove and is exposed outside the blade seat.

[0011] In one of the embodiments, a plurality of connecting rods are provided, at least two of the connecting rods are connected with the first elastic member, the plurality of connecting rods are sequentially rotationally connected through connecting rod shafts to form a multi-connecting rod structure, two ends of the multi-connecting rod structure are rotationally connected with the blade body and the blade seat respectively.

[0012] In one of the embodiments, the first elastic member is a torsion spring, the torsion spring includes a plurality of spiral parts, each of the spiral parts is sleeved on a connecting rod shaft to elastically connect the torsion spring with the plurality of connecting rods.

[0013] In one of the embodiments, one side of the connecting rod is provided with a rotation-stopping tooth, the rotation-stopping tooth is sleeve-shaped, and the spiral part of the torsion spring is sleeved on the outer periphery of the rotation-stopping tooth.

[0014] In one of the embodiments, the telescopic knife further includes:

[0015] A limiting assembly is arranged in the accommodating cavity;

[0016] A control assembly includes a button and a second elastic member, one end of the button is rotationally connected with the blade seat, the other end is drivingly connected with the limiting assembly, and two ends of the second elastic member are elastically abutted against the button and the blade seat.

[0017] In one of the embodiments, the limiting assembly includes a limiting block and a guide column, the limiting block is provided with a limiting hole, the guide column passes through the limiting hole, and two ends of the guide column are connected with the blade seat.

[0018] In one of the embodiments, the abutting surfaces of the limiting block and the button are both inclined surfaces; and / or,

[0019] A relief groove is formed in the cavity wall of the accommodating cavity, the limiting block and the groove wall of the relief groove are gap-fitted; the button is pressed to push the limiting block to move along the axial direction of the guide column into the relief groove.

[0020] In one of the embodiments, the inner wall of the slide rail has a lubricating glue layer, which is a Teflon glue layer.

[0021] In one of the embodiments, the telescopic cutter further comprises a bearing, which is installed at one end of the cutter body away from the opening and movably arranged in the slide rail, so that the cutter body is movably connected with the slide rail.

[0022] From the above technical solution, the embodiments of the present application have at least the following advantages and positive effects:

[0023] The telescopic cutter of the embodiments of the present application comprises a cutter seat, a cutter body and a connecting rod assembly, the cutter seat forms a containing cavity with an open end, the containing cavity is provided with a slide rail, the slide rail has a stroke center position, the cutter body is movably arranged in the slide rail, the connecting rod assembly comprises a connecting rod and a first elastic member, the connecting rod is movably arranged in the containing cavity and rotationally connected with the cutter body, the connecting rod is elastically connected with the first elastic member, under the action of an external force, the cutter body slides along the slide rail, before the cutter body passes the stroke center position, the first elastic member is compressed to accumulate elastic force, when the cutter body passes the stroke center position, the first elastic member releases the elastic force to push the cutter body to slide to an out-cutter state or a retracted-cutter state. The telescopic cutter proposed in the present application simplifies the opening and closing operation of the cutter, realizes the quick extension and retraction of the cutter body through simple pushing and pressing, and improves the operation efficiency of the cutter. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on the structures shown in the drawings.

[0025] Fig. 1 is a structural schematic diagram of the telescopic cutter of the present application;

[0026] Fig. 2 is an exploded structural schematic diagram of the telescopic cutter shown in Fig. 1;

[0027] Fig. 3 is an internal structural schematic diagram of the telescopic cutter of the present application when the cutter body is completely retracted;

[0028] Fig. 4 is an internal structural schematic diagram of the telescopic cutter of the present application when the cutter body is partially extended;

[0029] Fig. 5 is an internal structural schematic diagram of the telescopic cutter of the present application when the cutter body is completely extended;

[0030] Fig. 6 is a second perspective view of the telescopic cutter shown in Fig. 5;

[0031] Fig. 7 is an enlarged structural schematic diagram of the area A in the telescopic cutter shown in Fig. 6;

[0032] Fig. 8 is a schematic view of a structure of a connecting rod in the retractable knife.

[0033] The reference signs are explained as follows:

[0034] 10, retractable knife; 100, knife seat; 200, knife body; 300, connecting rod assembly; 400, limiting assembly; 500, control assembly; 600, bearing; 700, inclined surface;

[0035] 110, accommodating cavity; 111, opening; 112, avoiding groove; 120, sliding rail; 121, stroke center position; 130, guide groove; 140, portable hole; 210, protruding block; 310, connecting rod; 311, limiting part; 320, first elastic member; 321, spiral part; 330, connecting rod shaft; 410, limiting block; 411, limiting hole; 420, guide column; 510, button; 520, second elastic member. DETAILED DESCRIPTION

[0036] The typical embodiments embodying the features and advantages of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be understood that the present application can be implemented in various ways and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

[0037] In addition, the terms "first", "second", etc. are used only for the purpose of description and should not be understood as indicating or implying relative importance or a specific number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0038] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] First, please refer to Figs. 1 to 7, wherein Fig. 3 shows the knife body 200 fully extended out of the knife 10 in the knife-out state, and Fig. 5 shows the knife body 200 fully retracted into the knife 200 in the knife-in state.

[0040] The present application provides a telescopic knife 10, which is convenient to carry and can be used for cutting tasks in outdoor activities or for playing and relaxing in leisure time. The telescopic knife 10 comprises a knife holder 100, a knife body 200, a connecting rod assembly 300, a limiting assembly 400 and a control assembly 500. The knife holder 100 is formed with a containing cavity 110 having an open end 111, and the containing cavity 110 is provided with a sliding rail 120. The knife body 200 is movably arranged in the sliding rail 120, and the knife body 200 has an extended state of extending out of the opening 111 and a retracted state of retracting into the containing cavity 110. The connecting rod assembly 300 comprises a connecting rod 310 and a first elastic member 320. The connecting rod 310 is movably arranged in the containing cavity 110 and rotationally connected with the knife body 200. The connecting rod 310 is elastically connected with the first elastic member 320. The limiting assembly 400 is arranged in the containing cavity 110. The control assembly 500 comprises a button 510 and a second elastic member 520. One end of the button 510 is rotationally connected with the knife holder 100, and the other end is drivingly connected with the limiting assembly 400. The two ends of the second elastic member 520 are elastically abutted against the button 510 and the knife holder 100.

[0041] Specifically, referring to FIG. 4, the sliding rail 120 has a stroke center position 121. Under the action of an external force, the knife body slides along the sliding rail 120. When the knife body 200 passes the stroke center position 121, the first elastic member 320 is compressed to accumulate elastic force. When the knife body 200 passes the stroke center position 121, the first elastic member 320 releases the elastic force to push the knife body 200 to slide to the extended state or the retracted state.

[0042] The extended process of the knife body 200: the initial state is the retracted state shown in FIG. 3. The knife body 200 is pushed to slide along the sliding rail 120 and move towards the opening 111. At this time, the first elastic member 320 is compressed to accumulate elastic force. As shown in FIG. 4, the knife body 200 is continuously pushed to slide along the sliding rail 120 and pass the stroke center position 121. At this time, the first elastic member 320 releases the elastic force to push the knife body 200 to continuously slide to the extended state shown in FIG. 5. The state change process of the telescopic knife 10 is from FIG. 3 to FIG. 4 to FIG. 5.

[0043] The retracted process of the knife body 200: the initial state is the retracted state shown in FIG. 5. The knife body 200 is pushed to slide along the sliding rail 120 and move away from the opening 111. At this time, the first elastic member 320 is compressed to accumulate elastic force. As shown in FIG. 4, the knife body 200 is continuously pushed to slide along the sliding rail 120 and pass the stroke center position 121 in the opposite direction. At this time, the first elastic member 320 releases the elastic force to push the knife body 200 to continuously slide to the retracted state shown in FIG. 3. The state change process of the telescopic knife 10 is from FIG. 5 to FIG. 4 to FIG. 3.

[0044] It can be understood that in the present embodiment, the first elastic member 320 is in the state of elastic abutment when the telescopic cutter 10 is in the retracted state and the extended state, that is, the connecting rod assembly 300 has a limiting effect on the cutter body 200 in the retracted state and the extended state to prevent the cutter body 200 from moving, at which time the limiting assembly 400 and the control assembly 500 can not be provided, and the limiting of the cutter body 200 is shown by the first elastic member 320. Of course, the manufacturer can also freely adjust the state of the first elastic member 320 in the extended state and the retracted state according to needs.

[0045] It should be noted that the overstroke center position 121 in the present application refers to the position of the connecting rod assembly 300 and the cutter body 200. The stroke center position 121 is not limited to the center position of the slide rail 120, and the position of the stroke center position 121 is determined by the relative position of the connecting rod assembly 300 and the cutter body 200.

[0046] In the present embodiment, the inner wall of the slide rail 120 has a lubricating glue layer, which is Teflon glue. The Teflon glue has the advantages of chemical corrosion resistance, fire resistance, and long service life. It can be understood that in other embodiments, the Teflon glue can be replaced by other glue or glue layers.

[0047] In the present embodiment, the design of the cutter seat 100 not only provides a space for accommodating the cutter body 200 and installing various components, but also facilitates the user's holding and operation, ensuring the stability and safety of the operation. The cutter seat 100 can be made of aluminum alloy or stainless steel, etc., so that it has the characteristics of corrosion resistance and lightness. The cutter seat 100 is composed of two pieces of shell with the same shape and size, and the two pieces of shell can be connected by screws, pins or buckles in a detachable manner, so as to facilitate the disassembly, replacement and maintenance of the components of the telescopic cutter 10. The end of the cutter seat 100 away from the opening 111 is provided with a portable hole 140, which not only provides an additional holding point to make the holding more stable, but also provides convenience for hanging or fixing the cutter, so that the user can easily hang the cutter on a hook or tie it to a belt.

[0048] The cutter body 200 can be connected with the slide rail 120 through a bearing 600, or a sliding block and a sliding groove can be respectively arranged on the cutter body 200 and the slide rail 120, and the sliding block and the sliding groove are matched to realize the sliding connection between the cutter body 200 and the slide rail 120. The slide rail 120 not only provides sliding guidance for the cutter body 200, but also limits the sliding of the cutter body 200, ensuring that the cutter body 200 moves along the preset movement trajectory during the telescopic process, so as to improve the stability of the extension of the cutter.

[0049] The cutter body 200 can be made of stainless steel, alloy steel or ceramic material, so as to have good hardness and wear resistance. The cutter body 200 is provided with a pushing member, and the user can drive the cutter body 200 to move by pushing the pushing member, so as to make the cutter body 200 more labor-saving and convenient to move. The size of the accommodating cavity 110 is larger than that of the cutter body 200, and when the cutter body 200 is in the sheathed state, the cutter body 200 is completely located in the accommodating cavity 110, thereby improving the safety of operation.

[0050] The cutter body 200 is rotationally connected to the cutter seat 100 through the connecting rod 310, so that the cutter body 200 is more stable when moving along the slide rail 120 relative to the cutter seat 100.

[0051] The connecting position of the limiting assembly 400 and the cutter body 200 can be provided with a clamping groove, a clamping buckle or a clamping block, and the cutter body 200 and the limiting assembly 400 are clamped and connected through the clamping structure. The limiting assembly 400 is arranged on the moving path of the cutter body 200 and is arranged at a position close to the opening 111 of the accommodating cavity 110, so that when the cutter body 200 is clamped with the limiting assembly 400, the cutter body 200 is at the maximum extension length, the maximum cutting length is provided, and the efficiency of cutting work is improved.

[0052] The button 510 is exposed outside the cutter seat 100, so that it is easy for the user to touch and operate, so as to facilitate the user to quickly start the extension and retraction of the cutter. The second elastic member 520 is a spring, the button 510 is provided with a spring groove (not marked), one end of the spring is embedded in the spring groove, and the other end is in abutment with the limiting block 410. The spring groove has the effect of limiting the spring, so as to prevent the spring from horizontally moving during compression, and improve the stability of the spring deformation. In addition to the pressing structure of the button 510 and the elastic member in the present application, the design of separating the limiting assembly 400 and the cutter body 200 can also be achieved by using sliding type, rolling type, rotating type and other structures to unlock the limiting assembly 400 and the cutter body 200.

[0053] When the cutter is extended, the cutter body 200 is moved along the slide rail 120 until the cutter body 200 extends out of the opening 111 of the accommodating cavity 110, at this time the cutter body 200 is clamped with the limiting assembly 400, so that the cutter body 200 is in the extended state, and the first elastic member 320 accumulates elastic force and then releases the elastic force in this process. When the cutter is retracted, the button 510 of the control assembly 500 is pressed to compress the second elastic member 520, so as to drive the limiting assembly 400 to separate from the cutter body 200. With the separation of the limiting assembly 400, the user can pull the cutter body 200 in the opposite direction, and drive the connecting rod 310 to drive the cutter body 200 to retract into the accommodating cavity 110. The retractable cutter 10 provided in the present application simplifies the opening and closing operation of the cutter, and realizes the quick extension and retraction of the cutter body 200 by simple pushing and pulling, thereby improving the operation efficiency of the cutter.

[0054] Referring to FIGS. 3-5, the knife body 200 and the slide rail 120 are both arc-shaped; the knife holder 100 is provided with a guide groove 130 on one side, the guide groove 130 is communicated with the opening 111, the knife body 200 is provided with a protrusion 210 on one side, the protrusion 210 passes through the guide groove 130 and is exposed outside the knife holder 100, the protrusion 210 is pushed to move the knife body 200 along the slide rail 120 and extend out of the opening 111.

[0055] In the embodiment, the knife body 200 and the slide rail 120 are designed with the same arc, which ensures consistent contact and smooth movement between the knife body 200 and the slide rail 120 when the knife body 200 moves along the slide rail 120, thereby improving the extension performance and service life of the knife.

[0056] The extension direction of the guide groove 130 is the same as the moving direction of the knife body 200, so as to facilitate the movement of the knife body 200 along the slide rail 120 driven by the protrusion 210 extending out of the guide groove 130. The size of the guide groove 130 should be slightly larger than the size of the protrusion 210, so as to leave enough space for the smooth sliding of the protrusion 210 and avoid excessive gap causing the protrusion 210 to shake. The protrusion 210 is located on the side of the knife body 200 far away from the opening 111 in the retracted state, so as to make it more convenient and labor-saving for the user to push the knife body 200.

[0057] Referring to FIGS. 1-5, the retractable knife 10 is in the shape of an eagle claw, and in the embodiment, the design of the eagle claw shape provides a shape that is more in line with the natural grip of the human hand, increasing the comfort and stability when holding, and also saving labor. Compared with the straight line and cylindrical handle design, the design of the eagle claw shape increases the contact area between the knife and the hand, thereby providing better stability during operation and reducing the possibility of knife sliding or displacement.

[0058] Referring to FIGS. 2-5, the plurality of connecting rods 310 are connected with the first elastic member 320, and the plurality of connecting rods 310 are sequentially rotationally connected by connecting rod shafts 330 to form a multi-connecting rod structure, both ends of the multi-connecting rod structure are rotationally connected with the knife body 200 and the knife holder 100, respectively, and in the retracted state, the first elastic member 320 drives the multi-connecting rod structure to contract to drive the knife body 200 to retract into the accommodating cavity 110.

[0059] In the embodiment, the first elastic member 320 can be a torsion spring or a spring, and the plurality of connecting rods 310 are four, the first elastic member 320 can be elastically connected with each connecting rod 310, so that the elastic force of the first elastic member 320 is more evenly distributed on each connecting rod 310 and acts on the knife body 200, thereby avoiding overloading or damage caused by the force concentrated on a single connecting rod 310, thereby enhancing the stability and reliability of the entire connecting rod assembly 300. Part of the connecting rods 310 can also be elastically connected with the first elastic member 320. In other embodiments, the connecting rods 310 can also be three or five.

[0060] The multi-link structure provides an efficient and stable power transmission mode for the retractable tool 10. When the user performs the tool retracting operation, the synchronous movement of the multi-link structure enables the tool body 200 to be smoothly and uniformly retracted into the accommodating cavity 110. This design significantly reduces the uneven load or stress concentration that may be caused by a single link 310, thereby reducing the tool wear and failure rate.

[0061] Referring to FIGS. 2-5, the first elastic member 320 is a torsion spring, which includes a plurality of spiral portions 321, each of which is sleeved on a link shaft 330 to elastically connect the torsion spring and the plurality of links 310.

[0062] In this embodiment, the torsion spring can provide a high elastic force output in a small space, which is very suitable for space-limited applications. When applied to the multi-link structure, it not only saves space but also provides the necessary power for the links 310. The torsion spring can be designed in different shapes, sizes, and wire diameters to meet various application requirements. For example, the torsion spring is designed to have a plurality of spiral portions 321 in this application, each of which is formed by spirally winding an elastic metal. The spiral portion 321 is sleeved on the link shaft 330, which serves as a limiting position for the torsion spring to improve its stability during deformation. A rotation-stopping tooth 311 is provided on one side of the link 310, which is sleeve-shaped and is sleeved on the outer periphery of the link shaft 330. At this time, the spiral portion 321 of the torsion spring is sleeved on the outer periphery of the rotation-stopping tooth 311. When the two rotationally connected links 310 are rotated to a certain angle, the rotation-stopping teeth 311 on the two links 310 abut and limit each other from rotating, thereby limiting the rotation of the links 310 and preventing the tool body 200 from being stuck or disengaged from the tool holder 100, thereby improving the reliability of the tool during use. The two spiral portions 321 are connected by a straight elastic metal. By providing a plurality of spiral portions 321, each link 310 is subjected to the elastic force of the first elastic member 320 when it rotates, so that the tool body 200 is subjected to the elastic force of the first elastic member 320 when it is in the tool retracting state or the tool extending state, thereby improving the stability of the multi-link structure during rotation.

[0063] Referring to FIGS. 2-5, the limiting assembly 400 includes a limiting block 410 and a guide column 420. The limiting block 410 has a limiting hole 411 formed therein, and the guide column 420 passes through the limiting hole 411 and is connected to the tool holder 100 at both ends. In the tool-out state, the limiting block 410 is clamped with the tool body 200. The button 510 is pressed to abut against the limiting block 410 and push the limiting block 410 to move along the axial direction of the guide column 420, so that the limiting block 410 is separated from the tool body 200, and the tool body 200 is retracted into the accommodating cavity 110.

[0064] In the present embodiment, the limiting block 410 and the guide column 420 can be made of high-strength metal or engineering plastic to provide the required strength and durability. The shape of the limiting block 410 can be designed to match the contact surface of the tool body 200 to ensure that when the tool body 200 is extended, the limiting block 410 has the maximum contact area with the tool body 200, thereby improving the stability of the clamping of the limiting block 410 and the tool body 200. The limiting block 410 can be designed with internal reinforcing ribs to increase its structural rigidity and durability, preventing deformation or damage during repeated use. The connection between the guide column 420 and the tool holder 100 can be a threaded connection or a buckle connection to ensure stability and reliability during tool use. The threaded connection allows quick disassembly and maintenance, while the buckle connection provides the convenience of quick connection without tools.

[0065] By providing the limiting hole 411 on the limiting block 410, the guide column 420 can be precisely positioned on the limiting block 410, ensuring that the tool body 200 moves along a predetermined trajectory when extended and retracted. The edges of the limiting hole 411 can be designed with chamfered or rounded corners to reduce wear of the guide column 420. At the same time, the cooperation of the limiting hole 411 and the guide column 420 provides a stable guiding mechanism, reducing the shaking or deviation of the tool during use and improving the accuracy of use.

[0066] Referring to FIGS. 6-7, the surfaces of the limiting block 410 and the button 510 that abut against each other are both inclined surfaces 700. In the present embodiment, when the tool is retracted, the button 510 is pressed, and the design of the inclined surface 700 forms an angle between the moving direction of the button 510 and the separation direction of the limiting block 410, so that part of the force of the button 510 is converted into the force pushing the limiting block 410. Therefore, by setting the surfaces of the limiting block 410 and the button 510 that abut against each other as inclined surfaces 700, the user only needs a small force to easily start the tool retraction, making the tool retraction more labor-saving and efficient. At the same time, the inclined surface 700 also helps to smooth the movement of the button 510, reducing the friction between the limiting block 410 and the inclined surface 700, making the tool retraction process more smooth.

[0067] Referring to FIG. 3, the cavity wall of the accommodating cavity 110 is provided with a relief groove 112, and the limiting block 410 is in gap cooperation with the groove wall of the relief groove 112; the press button 510 is pressed to push the limiting block 410 to move along the axial direction of the guide column 420 into the relief groove 112.

[0068] In the embodiment, there is a certain gap between the relief groove 112 and the limiting block 410, so that the limiting block 410 can smoothly slide in the relief groove 112, and friction and wear between the limiting block 410 and the relief groove 112 are avoided, thereby prolonging the service life of the cutter. When the press button 510 is pressed to push the limiting block 410 to move along the axial direction of the guide column 420, the relief groove 112 plays a role of moving guide for the limiting block 410, ensuring that the limiting block 410 can smoothly move to the required position, and also avoiding collision or interference of the limiting block 410 with other components during movement. In addition, the introduction of the relief groove 112 also simplifies the maintenance and assembly process of the cutter. Since the relief groove 112 provides a moving relief space for the limiting block 410, the limiting block 410 can be more easily disassembled and reassembled during maintenance or replacement, reducing maintenance time and cost.

[0069] Referring to FIGS. 2 to 5, the telescopic cutter 10 further comprises bearings 600, which are installed at one end of the cutter body 200 away from the opening 111 and movably arranged in the slide rail 120 to movably connect the cutter body 200 and the slide rail 120.

[0070] In the embodiment, the bearings 600 are ball bearings 600, which are composed of an inner ring, an outer ring, and spherical balls arranged between the inner ring and the outer ring. The low-friction characteristics of the ball bearings 600 enable the cutter body 200 to be quickly and easily telescoped, reducing friction and noise during telescoping of the cutter body 200, thereby improving the response speed and smoothness of operation of the cutter. In other embodiments, the bearings 600 can also be replaced by components such as balls and rollers, which can also achieve the effect of quick and easy telescoping of the cutter body 200.

[0071] Referring to FIGS. 2 to 5, the bearings 600 are provided in four, and the four bearings 600 are movably arranged in the slide rail 120, and one bearing 600 is rotatably connected with the connecting rod 310.

[0072] In the embodiment, by providing four bearings 600 and symmetrically arranging the four bearings 600 on both sides of the cutter body 200, not only the stability and support of the cutter body 200 in the slide rail 120 are enhanced, but also more uniform load distribution is achieved. This structural design helps to reduce the inclination or deviation of the cutter body 200 that may be caused by uneven load, ensuring stable movement of the cutter body 200 during telescoping and improving cutting accuracy and overall performance of the cutter.

[0073] One of the bearings 600 is rotatably connected with the link 310, which provides higher flexibility for the link assembly 300. This connection allows the link 310 to rotate freely during the extension and retraction process, reducing the friction and wear caused by the contact between the link 310 and the tool body 200 or the slide rail 120. This not only prolongs the service life of the tool, but also makes the operation smoother and reduces the required maintenance work. In combination with the above-mentioned embodiments of the link assembly 300, when the tool body 200 is provided with the bearing 600, the helical portion 321 of the torsion spring can be sleeved on the bearing 600 to realize the rotational connection between the tool body 200 and the link 310.

[0074] While the application has been described with reference to several exemplary embodiments, it is to be understood that the use of other words or terms such as "preferably," "according to an embodiment," and "in one embodiment" is intended to convey that the particular naming and placement of an element or characteristic is not to imply that all embodiments according to the application are the same. Furthermore, the terms "comprise," "comprising," "front," "containing," "contain" and "including" are to be construed as open-ended terms (i.e., meaning "including, but not limited to," "comprising, but not limited to," "fronting, but not limited to," "containing, but not limited to" or "including, but not limited to") unless the context dictates otherwise. Thus, use of these terms is not intended to exclude other embodiments from the scope of the application.

Claims

1. A telescopic cutter, characterized in that, The utility model relates to a retractable knife, which comprises: a knife holder, which is provided with an accommodation cavity with an open end, and a slide rail is arranged in the accommodation cavity, and the slide rail has a stroke center position; a knife body, which is movably arranged in the slide rail, and the knife body has an extended state in which the knife body extends out of the open end and a retracted state in which the knife body is retracted into the accommodation cavity; a connecting rod assembly, which comprises a connecting rod and a first elastic member, the connecting rod is movably arranged in the accommodation cavity and rotationally connected with the knife body, and the connecting rod is elastically connected with the first elastic member; under the action of an external force, the knife body slides along the slide rail, before the knife body passes the stroke center position, the first elastic member is compressed to accumulate elastic force, and after the knife body passes the stroke center position, the first elastic member releases the elastic force to push the knife body to slide to the extended state or the retracted state.

2. The telescopic knife of claim 1, wherein, The knife body and the slide rail are both arc-shaped, one side of the knife holder is provided with a guide groove, the guide groove is communicated with the open end, one side of the knife body is provided with a protrusion, the protrusion passes through the guide groove and is exposed outside the knife holder.

3. The telescopic knife of claim 1, wherein, The connecting rod is provided with a plurality of connecting rods, at least two connecting rods are connected with the first elastic member, a plurality of connecting rods are rotationally connected in sequence through connecting rod shafts to form a multi-connecting rod structure, and two ends of the multi-connecting rod structure are rotationally connected with the knife body and the knife holder respectively.

4. The telescopic cutter according to claim 3, characterized in that, The first elastic member is a torsion spring, the torsion spring comprises a plurality of spiral parts, each spiral part is sleeved on a connecting rod shaft to elastically connect the torsion spring with a plurality of connecting rods.

5. The telescopic cutter according to claim 4, characterized in that, One side of the connecting rod is provided with a rotation-stopping tooth in the form of a sleeve, and the spiral part of the torsion spring is sleeved on the outer periphery of the rotation-stopping tooth.

6. The telescopic knife of claim 1, wherein, The retractable knife further comprises: a limiting assembly arranged in the accommodation cavity; a control assembly comprising a button and a second elastic member, one end of the button is rotationally connected with the knife holder, the other end is drivingly connected with the limiting assembly, and two ends of the second elastic member are elastically abutted against the button and the knife holder.

7. The telescopic cutter according to claim 6, characterized in that, The limiting assembly comprises a limiting block and a guide column, the limiting block is provided with a limiting hole, the guide column passes through the limiting hole, and two ends of the guide column are connected with the knife holder.

8. The telescopic cutter according to claim 7, characterized in that, The abutted surfaces of the limiting block and the button are both inclined surfaces; and / or a gap between the limiting block and the groove wall of the avoiding groove is provided; the button is pressed to move the limiting block along the axial direction of the guide column into the avoiding groove.

9. A telescopic cutter according to claims 1-8, characterized in that An inner wall of the slide rail is provided with a lubricating glue layer, and the lubricating glue layer is a fluorine-containing rubber coating.

10. A telescopic cutter according to any one of claims 1 to 8, wherein, The retractable knife further comprises a bearing, the bearing is mounted at one end of the knife body away from the open end and movably arranged in the slide rail, so that the knife body is movably connected with the slide rail.

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