A trigger knife

Abstract

The present invention discloses a trigger knife, comprising a knife housing, a knife holder, a blade, an elastic member, a trigger, a linkage assembly, a connecting plate and a locking block. When the trigger is turned outward, the elastic member is deformed, the linkage assembly drives the connecting plate to move and moves the knife holder to a first knife-out position. When one end of the blade is lifted, the knife holder is matched with the inner wall of the knife housing. The linkage assembly moves the knife holder to a second knife-out position through the connecting plate. The connecting plate is fixed to the knife housing and separated from the knife holder. When one end of the blade moves downward, the knife holder moves downward and is separated from the inner wall of the knife housing. The elastic member recovers the deformation, and then moves the knife holder to a rebound position. The knife holder is connected to the connecting plate and is separated from the inner wall of the knife housing. When the trigger is turned inward, the linkage assembly drives the knife holder to move to an initial position through the connecting plate, and the blade retracts to the inner cavity of the knife housing. The locking block is movably mounted on the knife housing and is used to lock the blade in the inner cavity of the knife housing. The blade of the present invention can rebound automatically, and has high safety performance.

Description

Technical Field

[0001] The invention relates to a knife, in particular to a trigger knife. Background Art

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

[0003] However, existing trigger knives generally have the following problems:

[0004] (1) Too sensitive. The blade often rebounds before cutting.

[0005] (2) Its structure is a non-automatic rebound structure. After leaving the cutting surface, the blade will not automatically rebound. In addition, the safety lock structure is not strong and can easily fail, causing the trigger to pop out easily and the blade to pop out suddenly, thereby increasing the risk of injury to the user. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a trigger knife with good sensitivity. The blade can automatically rebound. Before cutting, the blade will not rebound suddenly. In addition, the safety lock structure is reliable and not easy to fail, thereby effectively reducing the risk of injury to the user and having high safety performance.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] A trigger knife comprises a knife housing, a knife holder, a blade, an elastic member and a trigger, wherein the knife holder is slidably mounted in the inner cavity of the knife housing, the blade is connected to the knife holder, the elastic member is used to provide an elastic force for the blade to be retracted into the inner cavity of the knife housing, and the trigger is rotatably mounted on the knife housing so that the trigger can move in the inner cavity of the knife housing and is partially exposed from the knife housing;

[0009] The trigger knife also includes a connected linkage component and a connecting plate, the linkage component is transmission-connected to the trigger, the connecting plate is movably connected to the knife holder, the two ends of the elastic member are respectively connected to the knife holder and the knife housing, the knife holder can movably contact the knife housing, and the trigger is pressed by an external force to rotate in a direction close to the knife housing, so that the linkage component can drive the connecting plate to move and move the knife holder to the knife-out position, and then the blade can extend out of the knife housing to effectively cut the material;

[0010] Wherein, the linkage assembly includes a first rack, a first transmission gear, a second transmission gear and a second rack, the first transmission gear and the second transmission gear are pivotally connected to the knife housing through a rotating shaft, and the number of teeth of the second transmission gear is greater than the number of teeth of the first transmission gear, the first rack is connected to the trigger and meshed with the first transmission gear, the second rack is connected to the connecting plate and meshed with the second transmission gear, and the extension direction of the second rack is the same as the sliding direction of the knife holder;

[0011] The trigger knife also includes a locking block, which is movably mounted on the knife housing. The movement trajectory of the locking block can be staggered or intersected with the movement trajectory of the trigger, and is used to limit the movement of the knife holder to lock the blade in the inner cavity of the knife housing.

[0012] Furthermore, the connecting plate and the second rack are manufactured by integral molding.

[0013] Furthermore, the inner wall of the knife housing is provided with a guide bevel for cooperating with the knife holder, the knife holder is provided with an arc surface and a limiting boss, and the connecting plate is provided with a protrusion for cooperating with the arc surface and a lifting bevel for cooperating with the limiting boss.

[0014] Furthermore, a fixing boss is provided on the connecting plate, and a fixing groove matching with the fixing boss is provided on the inner wall of the knife housing.

[0015] Furthermore, a movable through hole is provided on one end of the knife housing away from the blade, the movable through hole is communicated with the inner cavity of the knife housing, and the locking block is rotatably installed in the movable through hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The trigger knife of the present invention can automatically rebound after the blade of the blade leaves the cutting surface of the material, which is beneficial to reduce the risk of injury to the user. The trigger knife has a relatively appropriate sensitivity and will not rebound suddenly before cutting the material. The stroke is enlarged by the linkage component, so that the blade can reach a length sufficient to cut thicker materials. Moreover, a locking block is provided on the knife housing, and its structure is firm and reliable, and the blade can be effectively locked in the inner cavity of the knife housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a trigger knife of the present invention;

[0019] Figure 2 It is a schematic diagram of the internal structure of a trigger knife of the present invention;

[0020] Figure 3 for Figure 2 Schematic diagram of the local structure;

[0021] Figure 4 This is a structural diagram of the linkage component from one angle;

[0022] Figure 5 It is a structural diagram of the linkage component from another angle;

[0023] Figure 6 is a schematic diagram of the structure of the second rack;

[0024] In the figure: 1, knife housing; 2, knife holder; 3, blade; 4, elastic member; 5, trigger; 6, connecting plate; 7, locking block; 8, first rack; 9, first transmission gear; 10, second transmission gear; 11, second rack; 12, guide bevel; 13, arc surface; 14, limit boss; 15, bump; 16, lifting inclined surface; 17, fixing boss; 18, fixing groove. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figure 1-6 The trigger knife shown includes a knife housing 1, a knife holder 2, a blade 3, an elastic member 4 and a trigger 5. The knife holder 2 is slidably installed in the inner cavity of the knife housing 1, and the blade 3 is connected to the knife holder 2. The elastic member 4 is used to provide an elastic force for the blade 3 to retract into the inner cavity of the knife housing 1. The trigger 5 is rotatably installed on the knife housing 1 so that the trigger 5 can move in the inner cavity of the knife housing 1 and is partially exposed from the knife housing 1.

[0027] In this embodiment, the trigger knife also includes a linkage component and a connecting plate 6, the linkage component is transmission-connected to the trigger 5, the connecting plate 6 is movably connected to the knife holder 2, the two ends of the elastic member 4 are respectively fixed on the inner walls of the knife holder 2 and the knife housing 1, and the knife holder 2 can movably contact with the knife housing 1.

[0028] Specifically, the linkage assembly is meshedly connected with the trigger 5 , and the linkage assembly is connected with the connecting plate 6 .

[0029] As a preferred implementation scheme in this embodiment, the linkage assembly includes a first rack 8, a first transmission gear 9, a second transmission gear 10 and a second rack 11. The first transmission gear 9 and the second transmission gear 10 are pivotally connected to the knife housing 1 through a rotating shaft, and the number of teeth of the second transmission gear 10 is greater than the number of teeth of the first transmission gear 9. The first rack 8 is connected to the trigger 5 and meshes with the first transmission gear 9. The second rack 11 is connected to the connecting plate 6 and meshes with the second transmission gear 10. The extension direction of the second rack 11 is the same as the sliding direction of the knife holder 2.

[0030] The knife-out position of this embodiment includes a first knife-out position and a second knife-out position. When the trigger 5 is pressed by an external force, it will rotate in the direction close to the knife housing 1, and the elastic member 4 will be deformed, so that the linkage assembly can drive the connecting plate 6 to move and move the knife holder 2 to the first knife-out position, and then the blade 3 can extend out of the knife housing 1. When the blade 3 contacts the material, the end of the blade 3 that contacts the material is lifted, so that the knife holder 2 matches the inner wall of the knife housing 1, and the linkage assembly moves the knife holder 2 to the second knife-out position through the connecting plate 6. The connecting plate 6 will be fixed on the inner wall of the knife housing 1 and separated from the knife holder 2, so that the material can be effectively cut.

[0031] When the blade 3 is not in contact with the material, the end of the blade 3 in contact with the material will move downward and reset, causing the blade holder 2 to move downward and separate from the inner wall of the blade housing 1. The elastic member 4 can restore its deformation, thereby causing the blade holder 2 to move and reset to the rebound position. The blade holder 2 is connected to the connecting plate 6 and the connecting plate 6 is separated from the inner wall of the blade housing 1, so that the linkage assembly can drive the blade holder 2 to move and reset to the initial position through the connecting plate 6, and the blade 3 can be effectively retracted into the inner cavity of the blade housing 1.

[0032] In this embodiment, the number of teeth of the first transmission gear 9 is 8, the number of teeth of the second transmission gear 10 is 24, and the transmission ratio of the first transmission gear 9 and the second transmission gear 10 is 1:3. Therefore, when the two transmission gears rotate at the same angle, the stroke of the second transmission gear 10 is magnified by 3 times. When the first transmission gear 9 moves a little bit, the second transmission gear 10 has traveled more strokes, thereby being able to drive the second rack 11 to travel a longer stroke, so that the blade 3 can extend a sufficient length to effectively cut the material, with moderate sensitivity, and the phenomenon of the blade rebounding before cutting will not occur. Similarly, when the blade 3 is not in contact with the material, the elastic member 4 resumes its deformation. Under the action of the second rack 11, the connecting plate can drive the knife holder 2 to return to the initial position, so that the blade 3 can be automatically retracted into the inner cavity of the knife housing 1, avoiding the risk of injury caused by the blade 3 contacting the user.

[0033] Since the linkage assembly in this embodiment is a gear rack mechanism, the rotary motion of the trigger 5 can be converted into the linear motion of the knife holder 2, that is, the motion of the blade 3 is also a linear motion, so that under the same stroke of the trigger 5, it is more labor-saving to start, so it is easier to start the trigger knife. Moreover, the number of teeth of the second transmission gear 10 is greater than the number of teeth of the first transmission gear 9, so the stroke can be enlarged, so that under the same trigger 5 stroke, the blade 3 can extend forward more. The trigger knife in the prior art has a very short knife extension length (10mm), which cannot cut thicker materials such as thick cardboard, but under the action of the linkage assembly of this embodiment, the stroke can be enlarged, so that the knife extension length of the blade 3 can reach 21mm, and thicker materials can be effectively cut.

[0034] In addition, the trigger knife of this embodiment also includes a locking block 7, which is movably mounted on the knife housing 1. The movement trajectory of the locking block 7 can be staggered or intersected with the movement trajectory of the trigger 5, and is used to limit the movement of the knife holder 2 to lock the blade 3 in the inner cavity of the knife housing 1. In this way, through the above-mentioned safety lock structure, the safety performance of the trigger knife can be effectively improved.

[0035] It is understandable that a knife outlet is provided on one end of the knife housing 1, and the knife outlet is communicated with the inner cavity, so that the blade 3 can extend out of the knife housing 1 from the knife outlet or retract into the inner cavity from the knife outlet.

[0036] Preferably, the elastic member 4 in this embodiment is a spring. The trigger 5 is rotatably mounted on the knife housing 1 via a connecting shaft.

[0037] Preferably, the connecting plate 6 and the second rack 11 are made by integral molding.

[0038] As a preferred embodiment, the inner wall of the blade housing 1 is provided with a guide bevel 12 for cooperating with the blade holder 2, the blade holder 2 is provided with an arc surface 13 and a limiting boss 14, and the connecting plate 6 is provided with a protrusion 15 for cooperating with the arc surface 13 and a lifting bevel 16 for cooperating with the limiting boss 14.

[0039] It is worth mentioning that a fixing boss 17 is provided on the connecting plate 6 , and a fixing groove 18 matching with the fixing boss 17 is provided on the inner wall of the blade housing 1 .

[0040] In a more preferred embodiment, a movable through hole is provided on one end of the knife housing 1 away from the blade 3, the movable through hole is communicated with the inner cavity of the knife housing 1, and the locking block 7 is rotatably installed in the movable through hole. In this way, by making the locking block 7 rotate in the movable through hole, the movement of the trigger 5 is restricted, the function of the safety lock is achieved, and the safety performance of the trigger knife can be improved.

[0041] When in use, the locking block 7 is rotated away from the trigger 5 to make room for the trigger 5 to rotate. Even if the movement trajectory of the locking block 7 is staggered with that of the trigger 5, the trigger 5 can move into the inner cavity of the knife housing 1.

[0042] Holding the trigger knife, the trigger 5 is pressed by an external force and rotated in the direction close to the knife housing 1. The spring will deform, so that the first rack 8 moves up to drive the first transmission gear 9 to rotate counterclockwise, and then the second transmission gear 10 rotates synchronously, so that the second transmission gear 10 can drive the second rack 11 to move in the direction close to the knife exit. Under the action of the limiting boss 14 on the knife holder 2, one end of the connecting plate 6 is abutted against the limiting boss 14, so that the second rack 11 can push the knife holder 2 to move in the direction close to the knife exit through the connecting plate 6, so that the knife holder 2 moves to the first knife exit position, and then the blade 3 extends out of the knife housing 1. When the blade 3 is in contact with the material, the end of the blade 3 in contact with the material is lifted upward due to the reaction force of the material, and the end of the blade holder 2 close to the knife outlet is lifted upward at the same time, so that it contacts the guide bevel 12, so that the blade holder 2 will move obliquely forward under the guidance of the guide bevel 12, and the end of the blade holder 2 away from the knife outlet will contact the connecting plate 6, so that the blade holder 2 can drive the second rack 11 to move obliquely forward to the second knife outlet position through the connecting plate 6, and the fixed boss 17 on the connecting plate 6 can be on the fixed groove 18 on the inner wall of the blade housing 1, so that the second rack 11 is fixed to the inner wall of the blade housing 1 through the connecting plate 6, so that the blade holder 2 is separated from the connecting plate 6. In this way, it is helpful to prevent the blade 3 from rebounding before cutting the material.

[0043] Since the knife holder 2 loses the support force of the second rack 11, after the blade 3 is no longer in contact with the material, the end of the blade 3 in contact with the material will move downward and reset, so that the knife holder 2 moves downward and separates from the inner wall of the knife housing 1, and the knife holder 2 moves back under the action of the spring. The knife holder 2 moves and resets to the rebound position, at which time the arc surface 13 hits the boss of the connecting plate 6, so that the connecting plate 6 is lifted upward, so that the connecting plate 6 is no longer stuck on the inner wall of the knife housing 1, even if the second rack 11 is separated from the inner wall of the knife housing 1. When the trigger 5 is released, the second rack 11 starts to rebound under the tension of the spring, so that the second rack 11 moves away from the knife edge. On the way, the lifting bevel 16 on the connecting plate 6 hits the limiting boss 14 on the tool holder 2, so that the tool holder 2 is lifted upward along the lifting bevel 16. In this way, the connecting plate 6 cooperates with the tool holder 2, so that the tool holder 2 moves and resets to the initial position. The limiting boss 14 and the connecting plate 6 abut against each other. The movement and reset of the second rack 11 can drive the second transmission gear 10 to rotate clockwise, and the first transmission gear 9 rotates synchronously, thereby driving the first rack 8 to move down and reset, thereby driving the trigger 5 to rotate away from the knife housing 1. In this way, the blade 3 can be effectively retracted into the inner cavity of the knife housing 1, and the blade 3 can be automatically rebounded after leaving the cutting surface of the material.

[0044] The locking block 7 is rotated toward the trigger 5, so that one end of the locking block 7 passes through the movable through hole and enters the inner cavity, and then the locking block 7 and the trigger 5 are abutted against each other, so that the trigger 5 cannot move, thereby limiting the movement of the knife holder 2, even if the blade 3 is locked in the inner cavity of the knife housing 1. By activating the safety lock structure, the safety performance of the trigger knife can be improved.

[0045] Therefore, in the trigger knife of the embodiment of the present invention, after the blade 3 leaves the cutting surface of the material, the blade 3 will automatically rebound, which is helpful to reduce the risk of injury to the user. The trigger knife has a relatively appropriate sensitivity, and will not rebound suddenly before cutting the material. By enlarging the stroke through the linkage component, the blade 3 can be extended to meet the cutting of thicker materials. In addition, a locking block 7 is provided on the knife housing 1, and its structure is firm and reliable, and the blade 3 can be effectively locked in the inner cavity of the knife housing 1.

[0046] 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, comprising a knife housing, a knife holder, a blade, an elastic member and a trigger, wherein the knife holder is slidably mounted in the inner cavity of the knife housing, the blade is connected to the knife holder, the elastic member is used to provide an elastic force for the blade to be retracted into the inner cavity of the knife housing, the trigger is rotatably mounted on the knife housing so that the trigger can move in the inner cavity of the knife housing and is partially exposed from the knife housing, characterized in that: The trigger knife also includes a connected linkage component and a connecting plate, the linkage component is transmission-connected to the trigger, the connecting plate is movably connected to the knife holder, the two ends of the elastic member are respectively connected to the knife holder and the knife housing, the knife holder can movably contact the knife housing, and the trigger is pressed by an external force to rotate in a direction close to the knife housing, so that the linkage component can drive the connecting plate to move and move the knife holder to the knife-out position, and then the blade can extend out of the knife housing to effectively cut the material; Wherein, the linkage assembly includes a first rack, a first transmission gear, a second transmission gear and a second rack, the first transmission gear and the second transmission gear are pivotally connected to the knife housing through a rotating shaft, and the number of teeth of the second transmission gear is greater than the number of teeth of the first transmission gear, the first rack is connected to the trigger and meshed with the first transmission gear, the second rack is connected to the connecting plate and meshed with the second transmission gear, and the extension direction of the second rack is the same as the sliding direction of the knife holder; The trigger knife also includes a locking block, which is movably mounted on the knife housing, and the movement trajectory of the locking block can be staggered or intersected with the movement trajectory of the trigger, and is used to limit the movement of the knife holder to lock the blade in the inner cavity of the knife housing; The inner wall of the knife housing is provided with a guiding bevel for cooperating with the knife holder, the knife holder is provided with an arc surface and a limiting boss, and the connecting plate is provided with a convex block for cooperating with the arc surface and a lifting bevel for cooperating with the limiting boss.

2. The trigger knife according to claim 1, characterized in that: The connecting plate and the second rack are manufactured by integral molding.

3. The trigger knife according to any one of claims 1 to 2, characterized in that: The connecting plate is provided with a fixing boss, and the inner wall of the knife housing is provided with a fixing groove matched with the fixing boss.

4. The trigger knife according to claim 1, characterized in that: An active through hole is arranged on one end of the knife housing away from the blade. The active through hole is communicated with the inner cavity of the knife housing, and the locking block is rotatably installed in the active through hole.

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