Trigger knife with fixed blade position

Abstract

The present invention discloses a trigger knife with a fixed blade position, comprising a knife housing, a knife holder, a blade, a first elastic member, a trigger and a limiting mechanism. The knife housing is provided with an inner cavity, a knife outlet communicated with the inner cavity is provided on the knife housing, the blade is provided on the knife holder, and the knife holder can move in the inner cavity toward or away from the knife outlet together with the blade; the trigger is rotatably mounted on the knife housing, so that the trigger can rotate in the inner cavity and the trigger is partially exposed outside the knife housing, and the trigger is used to drive the blade to extend out of the inner cavity; the first elastic member is used to drive the blade to retract into the inner cavity; the limiting mechanism is used to limit the angle of rotation of the trigger, so that the blade can be fixed at least one preset position in the inner cavity. The present invention can effectively fix the blade at at least one preset position in the inner cavity, which can meet the use requirements.

Description

Technical Field

[0001] The invention relates to a safety knife, in particular to a trigger knife with a fixed blade position. Background Art

[0002] A trigger knife is a type of hand-held safety knife. Its blade can be retracted into the knife housing. When in use, the blade can be extended out of the knife housing by pulling the trigger, thus improving the safety of the trigger knife.

[0003] However, the existing trigger knife only uses the trigger to transmit and fix the blade, which makes it difficult to effectively fix the blade at a preset position in the knife housing and cannot meet the use requirements. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a trigger knife with a fixed blade position, which can effectively fix the blade at a preset position in the knife housing, but cannot meet the use requirements.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] Trigger knife with fixed blade position, comprising:

[0007] A knife housing, a knife holder and a blade, wherein the knife housing is provided with an inner cavity, the knife housing is provided with a knife outlet communicated with the inner cavity, the blade is arranged on the knife holder, and the knife holder can move together with the blade in the inner cavity toward or away from the knife outlet;

[0008] A trigger is rotatably mounted on the knife housing, so that the trigger can rotate in the inner cavity and the trigger is partially exposed outside the knife housing, and the trigger is used to drive the knife holder and the blade to move toward the knife outlet so that the blade can extend out of the knife outlet;

[0009] A first elastic member is used to drive the blade holder and the blade to move together in a direction away from the blade outlet so that the blade can be retracted into the blade outlet;

[0010] The limiting mechanism is used to limit the rotation angle of the trigger so that the knife holder can fix the blade at at least one preset position in the inner cavity.

[0011] Furthermore, the limiting mechanism can move or rotate on the knife housing and can cooperate with the trigger.

[0012] Furthermore, it also includes a guide positioning plate, which is arranged in the inner cavity, and the limiting mechanism can slide on the guide positioning plate. The guide positioning plate is provided with at least one guide positioning groove, and the limiting mechanism is provided with a guide protrusion, and the guide protrusion can enter the guide positioning groove and cooperate therewith.

[0013] Furthermore, the limiting mechanism includes an adjusting plate and a limiting plate, the adjusting plate cooperates with the trigger through the limiting plate, a limiting opening connected to the inner cavity is opened on the knife housing, the limiting plate is arranged in the inner cavity, the adjusting plate can move in the limiting opening and drive the limiting plate to move in the inner cavity, and at least one fixing part is arranged on the trigger, and the fixing part can cooperate with the limiting plate.

[0014] Furthermore, the limiting mechanism also includes a fixed block, which is arranged on the limiting plate, and the fixing portion is a step surface arranged on the trigger, and the step surface can abut against the fixed block to limit the movement of the fixed block on the step surface.

[0015] Furthermore, it also includes a linkage mechanism and a connecting plate, which are arranged in the inner cavity, and the linkage mechanism is respectively engaged with the trigger and the connecting plate, and the connecting plate is connected to the knife holder, and the connecting plate can cooperate with the knife housing so that the knife holder can fix the blade at at least one preset position in the inner cavity.

[0016] Furthermore, at least one connecting portion is provided on the connecting plate, and at least one guiding portion is provided on the blade housing, and each connecting portion cooperates with a corresponding guiding portion, so that the blade holder can fix the blade at at least one preset position in the inner cavity.

[0017] Furthermore, the linkage mechanism includes a first transmission gear, a second transmission gear and a first rack, the first transmission gear and the second transmission gear are rotatably installed in the inner cavity, and the number of teeth of the second transmission gear is greater than or equal to the number of teeth of the first transmission gear, the first rack is connected to the trigger and meshes with the first transmission gear, and a second rack is arranged on the connecting plate, and the second rack is meshed and connected with the second transmission gear.

[0018] Furthermore, it also includes a mounting portion for facilitating assembly, wherein the mounting portion is respectively arranged on the second transmission gear and the second rack, or the mounting portion is respectively arranged on the first transmission gear, the second transmission gear and the second rack; the mounting portions can correspond in position to each other.

[0019] Furthermore, it also includes a second elastic member and a tool changing mechanism, the blade is detachably mounted on the tool holder, the second elastic member is arranged on the tool holder, a clamping hole is arranged on the blade, the second elastic member can pass through the clamping hole and can cooperate with the tool holder and the inner wall of the blade housing to limit the blade from escaping from the inner cavity, and the tool changing mechanism is used to drive the second elastic member to deform so that the blade can escaping from the inner cavity.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The rotation of the trigger can drive the knife holder and the blade to move in the inner cavity toward or away from the knife outlet, so that the blade can extend out of the knife outlet or retract into the knife outlet. Under the action of the limit mechanism, the angle of the trigger rotation can be limited, so that the blade can be fixed at at least one preset position in the inner cavity, which can effectively control the extension length of the blade to meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a trigger knife with a fixed blade position according to an embodiment of the present invention at one angle;

[0023] Figure 2 It is a schematic structural diagram of another angle of a trigger knife with a fixed blade position according to an embodiment of the present invention;

[0024] Figure 3 for Figure 1 Schematic diagram of structural decomposition;

[0025] Figure 4 for Figure 3 The structural diagram of A in the figure;

[0026] Figure 5 for Figure 3 Schematic diagram of the local structure;

[0027] Figure 6 for Figure 5 Schematic diagram of the local structure;

[0028] Figure 7 for Figure 2 Schematic diagram of the local structure;

[0029] Figure 8 for Figure 7 Schematic diagram of the local structure decomposition.

[0030] In the figure: 1, knife housing; 2, blade; 3, trigger; 4, guide positioning plate; 5, second rack; 6, guide protrusion; 7, adjustment plate; 8, limit plate; 9, connecting plate; 10, first transmission gear; 11, second transmission gear; 12, first rack; 13, mounting portion; 14, knife holder; 15, second elastic member; 16, clamping hole; 17, first guide positioning groove; 18, second guide positioning groove; 19, third guide positioning groove; 20, first fixing portion; 21, second fixing portion; 22, third fixing portion; 23, first connecting portion; 24, second connecting portion; 25, third connecting portion; 26, first guide portion; 27, second guide portion; 28, third guide portion; 29, guide plate; 30, knife changing button; 31, third elastic member; 32, knife changing plate; 33, fixing block; 34, knife outlet. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0032] like Figure 1-8 As shown, an embodiment of the present invention provides a trigger knife with a fixed blade position, comprising a knife housing 1, a knife holder 14, a blade 2, a first elastic member, a trigger 3 and a limiting mechanism. The knife housing 1 is provided with an inner cavity, and a knife outlet 34 connected to the inner cavity is provided on the knife housing 1. The blade 2 is arranged on the knife holder 14, and the knife holder 14 can move together with the blade 2 in the inner cavity toward or away from the knife outlet 34; the trigger 3 is rotatably mounted on the knife housing 1, so that the trigger 3 can rotate in the inner cavity and the trigger 3 is partially exposed outside the knife housing 1, and the trigger 3 is used to drive the knife holder 14 to move together with the blade 2 toward the direction of the knife outlet 34, so that the blade 2 can extend out of the knife outlet 34; the first elastic member is used to move the knife holder 14 together with the blade 2 toward the direction of the knife outlet 34, so that the blade 2 can retract into the knife outlet 34; the limiting mechanism is used to limit the rotation angle of the trigger 3, so that the knife holder 14 can fix the blade 2 at at least one preset position in the inner cavity.

[0033] On the basis of the above structure, the rotation of the trigger 3 can drive the knife holder 14 and the blade 2 to move in the inner cavity toward the direction of the knife outlet 34, so that the blade 2 can extend out of the knife outlet 34. Release the trigger 3, the trigger 3 rotates and resets, and under the action of the first elastic member, the knife holder 14 and the blade 2 move together in the direction away from the knife outlet 34, so that the blade 2 can be retracted into the inner cavity, making the trigger knife safe and reliable. Under the action of the limiting mechanism, the rotation angle of the trigger 3 can be limited, and then the knife holder 14 can fix the blade 2 at at least one preset position in the inner cavity, which can effectively control the extension length of the blade 2 and meet the use requirements.

[0034] In this embodiment, one end of the trigger 3 is mounted on the knife housing 1 via a rotating shaft so that the trigger 3 can rotate in the inner cavity.

[0035] In the specific implementation, a preset position is set in the inner cavity, specifically including implementation modes A and B:

[0036] Implementation A is that the preset position is the first preset position. After the blade 2 is retracted into the inner cavity, under the action of the limiting mechanism, the rotatable angle of the trigger 3 is 0, and the blade 2 will be fixed at the first preset position. At this time, the trigger knife is in a locked state, and the blade 2 cannot extend out of the inner cavity, which is beneficial to prevent the blade 2 from extending out of the inner cavity and contacting the user due to accidental touching of the trigger 3, thereby preventing injury, and is beneficial to improving the safety performance of the trigger knife.

[0037] Implementation method B is that the preset position is the second preset position. When the blade 2 needs to extend out of the inner cavity, under the action of the limiting mechanism, when the trigger 3 rotates counterclockwise at an angle a (a>0), the blade 2 will be fixed at the second preset position. At this time, the blade 2 will be able to extend out of the inner cavity, and the length of the blade 2 extending out of the inner cavity is g (g>0), so that the trigger knife is in the first gear pushing state. In this way, the extending length of the blade 2 can be effectively controlled to be g, which is beneficial to improving the accuracy of the knife and can meet the use requirements.

[0038] In other embodiments, two preset positions are set in the inner cavity, specifically including embodiments C and D:

[0039] Embodiment C is a combination of embodiments A and B, that is, the two preset positions are respectively the first preset position and the second preset position, and under the action of the limiting mechanism, the blade 2 can be fixed at the first preset position or the second preset position, so that the trigger knife can be switched between the locked state and the first gear push-out state, which is conducive to improving safety performance and knife-out accuracy.

[0040] Embodiment D is that the two preset positions are respectively the second preset position and the third preset position. When the blade 2 needs to extend out of the inner cavity, the blade 2 will be fixed at the second preset position or the third preset position under the action of the limiting mechanism. When the trigger 3 rotates counterclockwise at an angle of b (b>a), the blade 2 will be fixed at the third preset position. At this time, the blade 2 will be able to extend out of the inner cavity, and the length of the blade 2 extending out of the inner cavity is h (h>g), so that the trigger knife is in the second gear push-out state. In this way, the extension length of the blade 2 can be effectively controlled to be g or h, so that the trigger knife can switch between the first gear push-out state and the second gear push-out state, which is conducive to further improving the accuracy of the knife and can meet the use requirements.

[0041] In a specific implementation, the value range of b can be 7°<b≤10°, and the value range of a can be 4<a≤7°. In addition, the value range of h can be 15mm<h≤25mm, and the value range of g can be 0<g≤15mm. Preferably, h is 25mm and g is 15mm.

[0042] In this embodiment, if Figure 3As shown, the knife-out direction of the blade 2 is that the blade 2 moves from right to left and extends out of the knife-out opening 34 to realize the knife-out. In this embodiment, three preset positions are set in the inner cavity, that is, this embodiment is a combination of implementation modes A and D. The three preset positions are set along the knife-out direction, and are the first preset position, the second preset position and the third preset position in sequence. According to actual use needs, the blade 2 can be fixed at any one of the first preset position, the second preset position and the third preset position through the limiting mechanism. In this way, the trigger knife can be switched between the locked state, the first gear push-out state and the second gear push-out state, so that the trigger knife has higher safety performance and knife-out accuracy.

[0043] Of course, more than three preset positions can be set in the inner cavity according to actual needs to make the trigger knife have higher applicability.

[0044] As a preferred implementation in this embodiment, the limiting mechanism can move left and right on the knife housing 1 and can cooperate with the trigger 3 to help limit the rotation angle of the trigger 3.

[0045] Of course, in other embodiments, the limiting mechanism can move up and down on the knife housing 1 and can cooperate with the trigger 3, and it only needs to achieve the effect of limiting the rotation of the trigger 3.

[0046] In a specific implementation, the trigger knife further includes a guide positioning plate 4, which is disposed in the inner cavity. The limiting mechanism can slide on the guide positioning plate 4, so that the guide positioning plate 4 can provide a better guiding effect for the movement of the limiting mechanism.

[0047] In this embodiment, at least one guide positioning groove is provided on the guide positioning plate 4, and a guide protrusion 6 is provided on the limiting mechanism. The guide protrusion 6 can enter the guide positioning groove and cooperate therewith. In this way, through the cooperation between the guide protrusion 6 and the guide positioning groove, a better guiding effect is exerted on the movement of the limiting mechanism, which is beneficial to improve the accuracy of the movement of the limiting mechanism.

[0048] In a specific implementation, the number of guide positioning grooves matches the number of preset positions, which is beneficial to improving the accuracy of the movement of the limiting mechanism, so as to accurately limit the rotation angle of the trigger 3, thereby enabling the blade 2 to be fixed at the corresponding preset position in the inner cavity.

[0049] In this embodiment, there are three guide positioning grooves, which are arranged along the retracting direction of the blade 2, and are the first guide positioning groove 17, the second guide positioning groove 18 and the third guide positioning groove 19, respectively. The three guide positioning grooves correspond to the first preset position, the second preset position and the third preset position, respectively. Then, the guide protrusion 6 can be matched with any guide positioning groove, so that the trigger knife can be switched between the locked state, the first gear push-out state and the second gear push-out state, so that the trigger knife has higher safety performance and knife-out accuracy.

[0050] In this embodiment, the guide protrusion 6 has an arc-shaped surface, and the guide positioning groove is an arc-shaped groove, so that the arc-shaped surface and the arc-shaped groove can effectively cooperate with each other, so as to facilitate the smooth movement of the limiting mechanism on the guide positioning plate 4.

[0051] In a specific implementation, the limiting mechanism includes an adjustment plate 7 and a limiting plate 8, wherein the adjustment plate 7 cooperates with the trigger 3 through the limiting plate 8, a limiting opening communicating with the inner cavity is provided on the blade housing 1, and the limiting plate 8 is arranged in the inner cavity, and the adjustment plate 7 can move in the limiting opening and drive the limiting plate 8 to move in the inner cavity, and at least one fixing portion is arranged on the trigger 3, and the fixing portion can cooperate with the limiting plate 8. Among them, the number of fixing portions matches the number of preset positions, so that by moving the adjustment plate 7 in the limiting opening, the limiting plate 8 can be driven to move in the inner cavity, so that the limiting plate 8 can cooperate with the corresponding fixing portion on the trigger 3, so that the rotation angle of the trigger 3 can be effectively limited, and the blade 2 can be fixed at the corresponding preset position in the inner cavity.

[0052] In this embodiment, there are three fixing parts, which are arranged along the retracting direction of the blade 2, and are the first fixing part 20, the second fixing part 21 and the third fixing part 22, respectively. The three fixing parts correspond to the first guide positioning groove 17, the second guide positioning groove 18 and the third guide positioning groove 19, that is, they correspond to the first preset position, the second preset position and the third preset position. Then, the limit plate 8 can be matched with any fixing part, so that the trigger knife can switch between the locked state, the first gear push-out state and the second gear push-out state, so that the trigger knife has higher safety performance and knife-out accuracy.

[0053] As a preferred embodiment, the limiting mechanism further includes a fixing block 33, which is disposed on the limiting plate 8, and each fixing portion is a step surface disposed on the trigger 3, which can contact and fit tightly with the surface of the fixing block 33 to limit the movement of the fixing block 33 on the step surface. In this way, the force applied by the step surface to the fixing block 33 is perpendicular to the step surface, which can prevent the generation of a component force that causes the fixing block 33 to move on the trigger 3, so as to facilitate limiting the rotation of the trigger 3, thereby improving the fixing effect of the position of the blade 2.

[0054] In other embodiments, the fixing block 33 and the step surface are in point contact, so that the step surface and the fixing block 33 are pressed against each other.

[0055] In other embodiments, the limiting mechanism can rotate on the blade housing 1 and can cooperate with the trigger 3 to facilitate limiting the rotation angle of the trigger 3. The limiting mechanism may include a knob, and the blade housing 1 is provided with a rotating opening connected to the inner cavity. The knob is rotatably mounted on the rotating opening and connected to the fixing block 33. The rotation of the knob can make the fixing block 33 cooperate with any fixing part, so that the blade 2 can be fixed at the corresponding preset position in the inner cavity.

[0056] In this embodiment, the trigger knife further includes a linkage mechanism and a connecting plate 9, which are arranged in the inner cavity, and the linkage mechanism is respectively meshed and connected with the trigger 3 and the connecting plate 9, and the connecting plate 9 is connected to the knife holder 14, and the connecting plate 9 can cooperate with the knife housing 1, so that the knife holder 14 can fix the blade 2 at at least one preset position in the inner cavity. In this way, when the trigger 3 rotates, the rotary motion of the trigger 3 can be effectively converted into the linear motion of the blade 2 through the cooperation of the linkage mechanism and the connecting plate 9, and the blade 2 can be driven to move effectively in the inner cavity.

[0057] As a preferred embodiment, at least one connecting portion is provided on the connecting plate 9, and at least one guiding portion is provided on the inner wall of the blade housing 1, and each connecting portion cooperates with the corresponding guiding portion, so that the blade holder 14 can fix the blade 2 at least one preset position in the inner cavity, wherein the number of connecting plates 9 and guiding portions matches the number of preset positions, so that each connecting portion cooperates with the corresponding guiding portion, so that the blade 2 can be fixed at the corresponding preset position, which is beneficial to further improve the accuracy of the position fixation of the blade 2.

[0058] In this embodiment, the number of connecting parts is three, and the three connecting parts are arranged along the knife-out direction, and are the first connecting part 23, the second connecting part 24 and the third connecting part 25 in sequence. The number of guiding parts is three, and the three guiding parts are arranged along the knife-out direction, and are the first guiding part 26, the second guiding part 27 and the third guiding part 28 in sequence. The guiding parts correspond to the connecting parts one by one, and correspond to the first preset position, the second preset position and the third preset position respectively. Then, the connecting parts can be matched with the corresponding fixing parts, so that the trigger knife can be switched between the locked state, the first gear push-out state and the second gear push-out state, so that the trigger knife has higher safety performance and knife-out accuracy. In the specific implementation, the linkage mechanism may include a linkage gear and a first rack 12, the linkage gear is pivotally connected to the knife housing 1 through a rotating shaft, the first rack 12 is connected to the trigger 3 and meshes with the linkage gear, and a second rack 5 is provided on the connecting plate 9, and the second rack 5 is meshed and connected with the linkage gear. In this way, the trigger 3 drives the linkage gear to rotate through the first rack 12, and the linkage gear drives the second rack 5 to move in the inner cavity, so that the blade 2 can effectively move in the inner cavity.

[0059] In this embodiment, the linkage mechanism is used to amplify the stroke so that the blade 2 can effectively cut the material. The linkage mechanism includes a first transmission gear 10, a second transmission gear 11, a rotating shaft and a first rack 12. The first transmission gear 10 and the second transmission gear 11 are both pivotally connected to the knife housing 1 through the same rotating shaft, and the number of teeth of the second transmission gear 11 is greater than the number of teeth of the first transmission gear 10. The first rack 12 is connected to the trigger 3 and meshes with the first transmission gear 10. A second rack 5 is provided on the connecting plate 9. The second rack 5 is located on the upper side of the second transmission gear 11 and meshes with the second transmission gear 11.

[0060] Specifically, the first transmission gear 10 and the second transmission gear 11 may be two independent gears coaxially arranged, or may be integrally formed.

[0061] In this embodiment, the trigger 3 drives the first transmission gear 10 to rotate through the first rack 12. The number of teeth of the first transmission gear 10 is 8, and the number of teeth of the second transmission gear 11 is 24. The transmission ratio of the first transmission gear 10 and the second transmission gear 11 is 1:3, so when the two transmission gears rotate by the same angle, the stroke of the second transmission gear 11 is magnified by 3 times. When the first transmission gear 10 moves a little bit, that is, the trigger 3 only needs to rotate a smaller angle, and the second transmission gear 11 has traveled more stroke, so that it can drive the second rack 5 to travel a longer stroke. The stroke of the second rack 5 is the blade extension length of the blade 2, so that the blade 2 can extend a sufficient length to effectively cut the material. The sensitivity is moderate, and the blade 2 will not rebound before cutting. The trigger rotation stroke is small, which saves time and effort. Similarly, when the blade 2 is not in contact with the material, the first elastic member restores its deformation, and under the action of the second rack 5, the connecting plate 9 can drive the blade 2 to return to its initial position, so that the blade 2 can be automatically retracted into the inner cavity, avoiding the risk of injury caused by contact between the blade 2 and the user.

[0062] Since the linkage mechanism in this embodiment is a gear rack mechanism, the rotary motion of the trigger 3 can be converted into the linear motion of the blade 2, that is, the motion of the blade 2 is also a linear motion, and it can move left and right in the inner cavity. When the trigger 3 is pulled with the same stroke, it is more labor-saving when starting, so it is easier to start the trigger knife. Moreover, the number of teeth of the second transmission gear 11 is greater than the number of teeth of the first transmission gear 10, so the stroke can be enlarged, so that the blade 2 can extend forward more under the same trigger 3 stroke. The trigger knife in the prior art has a very short length (10mm), and it cannot cut thicker materials such as thick cardboard. However, under the action of the linkage mechanism of this embodiment, the stroke can be enlarged, so that the length of the blade 2 can reach 25mm, and thicker materials can be effectively cut.

[0063] In a specific implementation, the number of teeth of the first transmission gear 10 can be equal to the number of teeth of the second transmission gear 11, that is, the rotation strokes of the first transmission gear 10 and the second transmission gear 11 are equal. At this time, the blade extension length of the blade 2 is equal to the rotation stroke of the first transmission gear 10.

[0064] In other embodiments, the first transmission gear 10 and the second transmission gear 11 are not coaxially arranged, that is, the first transmission gear 10 and the second transmission gear 11 are respectively installed in the inner cavity through two rotating shafts, the first transmission gear 10 and the second transmission gear 11 are meshed and connected, the second rack 5 on the connecting plate 9 is on the lower side of the second transmission gear 11, and the rest of the structure is the same as the linkage mechanism of this embodiment.

[0065] In a more preferred embodiment, the trigger knife further includes a mounting portion 13 for facilitating assembly, and the mounting portion 13 is respectively arranged on the second transmission gear 11 and the second rack 5, or the mounting portion 13 is respectively arranged on the first transmission gear 10, the second transmission gear 11 and the second rack 5. The two or three mounting portions 13 can correspond to each other in position, which can ensure that the starting position of the trigger 3 is the same every time, which is conducive to improving assembly efficiency.

[0066] In specific implementation, the mounting portion 13 is a through hole, which is simple to manufacture and helps to reduce production and processing costs.

[0067] In this embodiment, the mounting portion 13 is a circular hole, which is respectively provided on the second transmission gear 11 and the second rack 5. During assembly, it is only necessary to install the circular holes on the second transmission gear 11 and the second rack 5 opposite to each other, so as to ensure that the starting position of the trigger 3 is the same every time, thereby improving the assembly efficiency.

[0068] In other embodiments, the mounting portion 13 may be a text or pattern logo, etc.

[0069] In addition, the trigger knife further includes a second elastic member 15 and a knife-changing mechanism, wherein the blade 2 is detachably mounted on the knife holder 14, the second elastic member 15 is disposed on the knife holder 14, and a clamping hole 16 is disposed on the blade 2. The second elastic member 15 can pass through the clamping hole 16 and can cooperate with the knife holder 14 and the inner wall of the knife housing 1 to limit the blade 2 from being separated from the inner cavity, and the knife-changing mechanism is used to drive the second elastic member 15 to deform so that the blade 2 can be separated from the inner cavity. In this way, the blade 2 can be easily replaced.

[0070] In this embodiment, one end of the first elastic member is fixed to the inner wall of the blade housing 1, and the other end is fixed to the blade holder 14, so that the blade holder 14 can move and reset in the inner cavity, so that the blade 2 can be effectively retracted into the inner cavity.

[0071] In this embodiment, the first elastic member is a spring, which is simple to manufacture and helps to reduce production and processing costs.

[0072] In other embodiments, the first elastic member may be an elastic band or the like.

[0073] In this embodiment, the blade holder 14 can slide in the inner cavity, so as to facilitate the blade holder 14 to move smoothly in the inner cavity.

[0074] In this embodiment, the trigger knife also includes a guide plate 29, and a sliding connection portion is provided on the knife holder 14. The sliding connection portion cooperates with the guide plate 29 to provide a better guiding effect on the movement of the knife holder 14, so that the knife holder 14 can move smoothly in the inner cavity.

[0075] In this embodiment, the blade holder 14 is engaged with the blade 2, and a slot is provided on the blade holder 14, which is used to engage with the blade 2, and a notch is provided on the slot that is connected to the inner cavity, and the blade 2 can enter or leave the slot through the notch. A second elastic member 15 is provided on the blade holder 14, and a hole 16 for the second elastic member 15 to pass through is provided on the blade 2. In this way, the blade 2 is installed in the slot, and the second elastic member 15 cooperates with the hole 16, so that the blade 2 is not easy to escape from the inner cavity, and the blade holder 14 cooperates with the inner wall of the blade housing 1 opposite to the notch, so that the blade 2 will not escape from the slot, so that the blade 2 can be effectively installed on the blade holder 14 and move synchronously with the blade holder 14.

[0076] In this embodiment, the second elastic member 15 is a spring sheet to facilitate the assembly and disassembly of the blade 2 .

[0077] In other embodiments, the second elastic member 15 may be a torsion spring or the like, as long as it can realize the assembly and disassembly of the blade 2 .

[0078] In this embodiment, the tool changing mechanism includes a tool changing button 30, a third elastic member 31 and a tool changing plate 32. A tool changing opening connected to the inner cavity is provided on the knife housing 1. The tool changing button 30 can move in the tool changing opening. The tool changing plate 32 is arranged in the inner cavity and one end of the tool changing plate 32 is fixed on the inner wall of the knife housing 1. The third elastic member 31 is arranged on the inner wall of the knife housing 1, and the two ends of the third elastic member 31 are respectively connected to the tool changing button 30 and the tool changing plate 32.

[0079] In this embodiment, the third elastic member 31 is a torsion spring, which has a simple structure and is conducive to reducing production and processing costs.

[0080] In other embodiments, the third elastic member 31 may be a spring, a spring sheet, etc., which can be used to reset the tool-changing button 30 .

[0081] In other embodiments, the tool changing mechanism can drive the tool changing plate 32 to move by a driving component such as a motor or a cylinder, so that the second elastic member 15 is deformed so that the blade 2 can be separated from the tool holder 14 .

[0082] When using the trigger knife, the specific method is as follows:

[0083] When the blade 2 needs to be replaced, the tool-changing button 30 can be moved in the tool-changing opening and can cooperate with the other end of the tool-changing plate 32, so that the tool-changing plate 32 can abut against the second elastic member 15 and deform the second elastic member 15, so that the second elastic member 15 can be disengaged from the clamping hole 16 and the blade 2 can be disengaged from the clamping slot, and the blade 2 can be taken out from the inner cavity. Insert another blade 2 into the inner cavity and make it enter the clamping slot. After the external force applied to the tool-changing button 30 disappears, the third elastic member 31 will restore its deformation, and then the tool-changing button 30 will reset, so that the tool-changing plate 32 and the second elastic member 15 are reset, and the second elastic member 15 re-enters the clamping port and cooperates with the clamping port, thus completing the replacement of the blade 2;

[0084] When the trigger knife needs to be locked, the adjusting plate 7 is moved in the limiting opening along the knife-out direction, and the adjusting plate 7 drives the limiting plate 8 to move in the inner cavity, so that the guide protrusion 6 enters the first guide positioning groove 17. At this time, the fixing block 33 will be able to cooperate with the first fixing portion 20, so that the trigger 3 cannot rotate, and the first guide portion 26 cooperates with the first connecting portion 23, so that the knife holder 14 cannot move in the inner cavity, thereby fixing the blade 2 at the first preset position, and the trigger knife is in a locked state, and the blade 2 cannot extend out of the inner cavity;

[0085] When the blade 2 needs to be pushed out to the second preset position, the adjustment plate 7 is moved in the limiting opening along the knife-out direction, and the adjustment plate 7 drives the limiting plate 8 to move in the inner cavity, thereby causing the guide protrusion 6 to enter the second guide positioning groove 18, so that the trigger 3 rotates by an angle a. At this time, the fixing block 33 will cooperate with the second fixing portion 21, so that the trigger 3 cannot continue to rotate. When the trigger 3 rotates, the knife holder 14 is driven to move in the inner cavity, so that the second guide portion 27 cooperates with the second connecting portion 24, so that the knife holder 14 cannot move in the inner cavity, thereby fixing the blade 2 at the second preset position. At this time, the length of the blade 2 extending out of the inner cavity is g, and the trigger knife is in the first gear pushing state;

[0086] When the blade 2 needs to be pushed out to the third preset position, the adjustment plate 7 is moved in the limiting opening along the knife-out direction, and the adjustment plate 7 drives the limiting plate 8 to move in the inner cavity, thereby causing the guide protrusion 6 to enter the third guide positioning groove 19, so that the trigger 3 rotates by an angle b. At this time, the fixing block 33 will cooperate with the third fixing portion 22, so that the trigger 3 cannot continue to rotate. When the trigger 3 rotates, it drives the knife holder 14 to move in the inner cavity, causing the third guide portion 28 to cooperate with the third connecting portion 25, so that the knife holder 14 cannot move in the inner cavity, thereby fixing the blade 2 at the third preset position. At this time, the length of the blade 2 extending out of the inner cavity is h, and the trigger knife is in the second gear pushing state.

[0087] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A trigger knife with a fixed blade position, characterized in that: include: A knife housing (1), a knife holder (14) and a blade (2), wherein the knife housing (1) is provided with an inner cavity, the knife housing (1) is provided with a knife outlet (34) communicating with the inner cavity, the blade (2) is arranged on the knife holder (14), and the knife holder (14) can move together with the blade (2) in the inner cavity in a direction approaching or moving away from the knife outlet (34); a trigger (3) rotatably mounted on the knife housing (1) so that the trigger (3) can rotate in the inner cavity and the trigger (3) is partially exposed outside the knife housing (1), and the trigger (3) is used to drive the knife holder (14) and the blade (2) to move together in a direction close to the knife outlet (34), so that the blade (2) can extend out of the knife outlet (34); A first elastic member, used for driving the blade holder (14) and the blade (2) to move together in a direction away from the blade exit (34), so that the blade (2) can be retracted into the blade exit (34); a limiting mechanism, used for limiting the rotation angle of the trigger (3) so that the knife holder (14) can fix the blade (2) at at least one preset position in the inner cavity, the limiting mechanism being movable or rotatable on the knife housing (1) and being able to cooperate with the trigger (3); The limiting mechanism comprises an adjusting plate (7) and a limiting plate (8), wherein the adjusting plate (7) cooperates with the trigger (3) via the limiting plate (8); a limiting opening communicating with the inner cavity is provided on the knife housing (1), the limiting plate (8) is arranged in the inner cavity, the adjusting plate (7) can move in the limiting opening and drive the limiting plate (8) to move in the inner cavity, and the trigger (3) is provided with at least one fixing portion, wherein the fixing portion can cooperate with the limiting plate (8); the limiting mechanism further comprises a fixing block (33), wherein the fixing block (33) is arranged on the limiting plate (8), and the fixing portion is a step surface provided on the trigger (3), wherein the step surface can abut against the fixing block (33) to limit the movement of the fixing block (33) on the step surface.

2. The trigger knife with a fixed blade position as claimed in claim 1, characterized in that: It also comprises a guide positioning plate (4), the guide positioning plate (4) being arranged in the inner cavity, the limiting mechanism being able to slide on the guide positioning plate (4), the guide positioning plate (4) being provided with at least one guide positioning groove, the limiting mechanism being provided with a guide protrusion (6), the guide protrusion (6) being able to enter the guide positioning groove and cooperate therewith.

3. The trigger knife with a fixed blade position as claimed in claim 1, characterized in that: The invention also comprises a linkage mechanism and a connecting plate (9), wherein the linkage mechanism and the connecting plate (9) are arranged in the inner cavity, the linkage mechanism is meshedly connected with the trigger (3) and the connecting plate (9) respectively, the connecting plate (9) is connected to the knife holder (14), and the connecting plate (9) can cooperate with the knife housing (1) so that the knife holder (14) can fix the blade (2) at at least one preset position in the inner cavity.

4. The trigger knife with a fixed blade position as claimed in claim 3, characterized in that: At least one connecting portion is provided on the connecting plate (9), and at least one guiding portion is provided on the blade housing (1), and each connecting portion cooperates with a corresponding guiding portion, so that the blade holder (14) can fix the blade (2) at at least one preset position in the inner cavity.

5. The trigger knife with a fixed blade position as claimed in claim 3, characterized in that: The linkage mechanism comprises a first transmission gear (10), a second transmission gear (11) and a first rack (12); the first transmission gear (10) and the second transmission gear (11) are rotatably mounted in the inner cavity, and the number of teeth of the second transmission gear (11) is greater than or equal to the number of teeth of the first transmission gear (10); the first rack (12) is connected to the trigger (3) and meshes with the first transmission gear (10); a second rack (5) is provided on the connecting plate (9), and the second rack (5) is meshedly connected with the second transmission gear (11).

6. The trigger knife with a fixed blade position according to claim 5, characterized in that: It also includes a mounting portion (13) for facilitating assembly, wherein the mounting portion (13) is respectively arranged on the second transmission gear (11) and the second rack (5), or the mounting portion (13) is respectively arranged on the first transmission gear (10), the second transmission gear (11) and the second rack (5); the mounting portions (13) can correspond to each other in position.

7. The trigger knife with a fixed blade position according to claim 1, characterized in that: The invention also comprises a second elastic member (15) and a knife changing mechanism, wherein the blade (2) is detachably mounted on the knife holder (14), the second elastic member (15) is arranged on the knife holder (14), the blade (2) is provided with a clamping hole (16), the second elastic member (15) can pass through the clamping hole (16) and can cooperate with the knife holder (14) and the inner wall of the knife housing (1) to limit the blade (2) from leaving the inner cavity, and the knife changing mechanism is used to drive the second elastic member (15) to deform so that the blade (2) can leave the inner cavity.

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