Straight jumping knife with blade convenient to replace

Abstract

The straight jump knife with the blade convenient to replace comprises a knife handle and the blade, the knife handle comprises a bottom cover and an upper cover, a blade frame and an ejection assembly used for controlling the blade frame to slide are arranged in the knife handle in a sliding mode, and the sliding direction of the blade frame is parallel to the length direction of the knife handle. One end of the blade is located on one side of the blade frame and is provided with a positioning hole, a limiting assembly is rotationally arranged on the blade frame, one end of the limiting assembly penetrates through the blade frame and is inserted into the positioning hole, and a quick detaching assembly used for driving the limiting assembly to move in the direction away from the blade is rotationally arranged on the cutter handle. According to the utility model, through the design of the quick-release component, the blade can be disassembled and assembled only by rotating the quick-release knob without the help of additional tools, so that the blade replacement efficiency is greatly improved, and a user can conveniently and quickly replace the blade in different scenes.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a straight jump cutter that facilitates blade replacement. Background Technology

[0002] As a common type of knife, the straight-blade switchblade knife, with its unique pop-out blade design, is widely used in outdoor adventures, everyday tool use, and some special work scenarios. Its portability and quick draw make it a favorite tool for many users.

[0003] Currently, most straight switchgear blades on the market have cumbersome and complex blade replacement methods, usually requiring specialized tools such as screwdrivers to remove and install the blades. This not only increases the difficulty of blade replacement for users and reduces replacement efficiency, but also makes it difficult for users to obtain suitable tools in real-world scenarios, such as outdoors or in emergencies, resulting in the inability to replace the blades in a timely manner and thus affecting the normal use of the switchgear. Summary of the Invention

[0004] The main objective of this invention is to provide a straight jump cutter with a convenient blade replacement method, thereby solving the problems of cumbersome and complex blade replacement methods and low replacement efficiency in existing straight jump cutters.

[0005] To solve the above problems, this utility model adopts the following technical solution: a straight jump cutter with convenient blade replacement, including a handle and a blade. The handle includes a bottom cover and a top cover. A blade holder and a catapult assembly for controlling the sliding of the blade holder are slidably disposed inside the handle. The sliding direction of the blade holder is parallel to the length direction of the handle. One end of the blade is located on one side of the blade holder and has a positioning hole. A limit assembly is rotatably disposed on the blade holder. One end of the limit assembly passes through the blade holder and is inserted into the positioning hole. A quick-release assembly for driving the limit assembly to move away from the blade is rotatably disposed on the handle.

[0006] Furthermore, the bottom cover is provided with a sliding groove, and the blade holder and the blade are slidably disposed in the sliding groove. The limiting component includes a blade locking shaft and a fixing rod. The side wall of the blade locking shaft near the blade holder is a first positioning surface. The first positioning surface has first arc-shaped protrusions on both radial sides. The blade holder has a through hole, and the through hole has second arc-shaped protrusions on both radial sides. Under normal conditions, the two first arc-shaped protrusions and the two second arc-shaped protrusions are arranged alternately. One end of the fixing rod is screwed to the blade locking shaft, and the other end of the fixing rod passes through the through hole and is inserted into the positioning hole.

[0007] Furthermore, the quick-release assembly includes a quick-release linkage shaft rotatably disposed inside the bottom cover and a quick-release knob rotatably disposed outside the bottom cover. One end of the quick-release linkage shaft is fixedly provided with a polygonal insert rod. The quick-release knob has a first insertion hole adapted to the insert rod. The outer side of the bottom cover is also provided with a quick-release screw. One end of the insert rod passes through the bottom cover and the first insertion hole and is screwed to the quick-release screw. The other end of the quick-release linkage shaft has an elongated relief groove. The blade locking shaft has an elongated tenon protruding from it. The relief groove and the tenon are coaxial. When the blade is in the extended state, the tenon is slidably disposed in the relief groove.

[0008] Furthermore, the bottom cover has a through-hole, and the insertion rod passes through the through-hole and is inserted into the first insertion hole. A fixing ring is fixed on the inner wall of the through-hole. The side of the fixing ring near the blade holder is a second positioning surface. A third arc-shaped protrusion is provided on both radial sides of the second positioning surface. A fourth arc-shaped protrusion is provided on both sides of the quick-release linkage shaft located on the insertion rod. Under normal conditions, the two third arc-shaped protrusions abut against the two fourth arc-shaped protrusions.

[0009] Furthermore, the side of the fixing ring away from the blade holder is a third positioning surface. The radial sides of the third positioning surface are respectively provided with fifth arc-shaped protrusions, and the sides of the first insertion hole are respectively provided with sixth arc-shaped protrusions. Under normal conditions, the two fifth arc-shaped protrusions and the two sixth arc-shaped protrusions are arranged alternately.

[0010] Furthermore, a positioning groove is recessed on the outer side wall of the bottom cover, and the quick-release assembly also includes a quick-release spring plate. The quick-release spring plate is located between the quick-release screw and the quick-release knob. One end of the quick-release spring plate has a second insertion hole that matches the insertion rod. One end of the insertion rod passes through the first insertion hole and the second insertion hole and is screwed to the quick-release screw. The other end of the quick-release spring plate extends to provide an arc-shaped positioning piece, and the middle part of the arc-shaped positioning piece is engaged in the positioning groove.

[0011] Furthermore, two positioning rods are fixedly provided at intervals on the side of the quick-release knob near the positioning groove, and the arc-shaped positioning piece is located between the two positioning rods.

[0012] Furthermore, the ejection assembly includes a spring frame, a front spring hook, a rear spring hook, and a tension spring. The spring frame is slidably disposed on one side of the bottom cover, and a slide rail is provided on the side of the spring frame closer to the blade holder. A slider is provided on the blade holder, and the slider is slidably disposed within the slide rail. The front spring hook and the rear spring hook are slidably disposed on the other side of the spring frame, respectively. One end of the front spring hook and the rear spring hook respectively passes through the spring frame and extends to both ends of the slide rail. Both ends of the tension spring are connected to the front spring hook and the rear spring hook respectively. A first slot and a second slot are provided at opposite corners on both sides of the blade holder along its length. A first block and a second block are provided on both sides of the bottom cover along its length. One end of the first block and the second block extends obliquely toward the corresponding first slot or second slot. Both sides of the spring frame are provided with abutment portions that move one end of the first block or the second block away from the blade holder.

[0013] Furthermore, each of the abutting portions is an inclined surface formed on the corresponding side wall of the spring frame, and the inclination direction of each abutting portion is opposite to the inclination direction of the corresponding first or second locking block.

[0014] Furthermore, a straight groove is provided on one side of the bottom cover in the width direction, a connecting piece is fixed on the spring frame, the free end of the connecting piece passes through the straight groove and is fixed with a push button, and the connecting piece is slidably connected to the straight groove.

[0015] The beneficial effects of this utility model are:

[0016] 1. Thanks to the quick-release component design, the blade can be removed and installed without the need for additional tools. Simply turn the quick-release knob to remove the blade, which greatly improves the efficiency of blade replacement and makes it convenient for users to quickly replace blades in different scenarios.

[0017] 2. The blade locking shaft in the limiting assembly and the through hole on the blade holder are connected by the staggered arrangement of the first arc-shaped protrusion and the second arc-shaped protrusion, as well as the insertion of the fixing rod and the blade positioning hole, which facilitates the positioning of the blade and ensures that the blade is securely installed on the blade holder. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 A perspective view of the straight jump cutter of this utility model, which allows for easy blade replacement;

[0020] Figure 2 Exploded view of the straight jump cutter of this utility model with convenient blade replacement;

[0021] Figure 3 This is a schematic diagram of the installation structure of the ejection assembly of this utility model;

[0022] Figure 4 This is a schematic diagram of the blade locking shaft and blade holder of this utility model;

[0023] Figure 5 This is a schematic diagram of the spring frame of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the fixing ring and quick-release connecting shaft of this utility model;

[0025] Figure 7 This is a side view of the straight jump cutter of this utility model, which allows for easy blade replacement.

[0026] Figure 8 for Figure 7 AA view;

[0027] Figure 9 for Figure 1 Top view;

[0028] Figure 10 for Figure 9 BB view;

[0029] Figure 11 This is a schematic diagram of the bottom cover.

[0030] Explanation of reference numerals in the attached figures

[0031] 1. Tool holder; 11. Bottom cover; 111. Slide groove; 112. Receiving groove; 113. Straight groove opening; 114. Displacement hole; 115. Retaining ring; 1151. Third arc-shaped protrusion; 1152. Fifth arc-shaped protrusion; 116. Positioning groove; 12. Top cover;

[0032] 2. Blade; 21. Positioning hole;

[0033] 3. Blade holder; 31. Baffle; 32. Slider; 33. First slot; 34. Second slot; 35. Through hole; 351. Second arc-shaped protrusion;

[0034] 4. Limiting component; 41. Blade locking shaft; 411. First arc-shaped protrusion; 412. Tenon; 42. Fixing rod;

[0035] 5. Ejection assembly; 51. Spring frame; 511. Slide rail; 512. Abutment part; 513. Connecting piece; 52. Front spring hook; 521. Fixing hole; 53. Rear spring hook; 54. Push button;

[0036] 6. Quick-release assembly; 61. Quick-release connecting shaft; 611. Insert rod; 612. Relief groove; 613. Fourth arc-shaped protrusion; 62. Quick-release knob; 621. First insertion hole; 622. Sixth arc-shaped protrusion; 623. Positioning rod; 63. Quick-release screw; 64. Quick-release spring plate; 641. Second insertion hole; 642. Arc-shaped positioning plate;

[0037] 7. First block; 71. Second block; Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Please see Figures 1 to 11 As shown, a switchblade knife with convenient blade replacement includes a handle 1, a blade 2, a blade holder 3, an ejection assembly 5, a limiting assembly 4, and a quick-release assembly 6. The handle 1 includes a bottom cover 11 and a top cover 12 that fit together. When the bottom cover 11 and the top cover 12 are closed, they form an internal accommodating space (not shown in the figure) for accommodating the blade 2, the blade holder 3, the ejection assembly 5, the limiting assembly 4, and part of the quick-release assembly 6. The blade holder 3 is slidably disposed within the accommodating space of the handle 1, with its sliding direction parallel to the length direction of the handle 1. Specifically, the bottom cover 11 has a groove 111, and the blade holder 3 is slidably disposed within the groove 111.

[0040] Please see Figure 2 As shown, one end of the blade 2 is located on one side of the blade holder 3, and both the blade 2 and the blade holder 3 are slidably disposed within the slide groove 111. The limiting component 4 is used to limit the blade 2, i.e., to prevent the blade 2 from detaching from the blade holder 3. Specifically, the limiting component 4 is rotatably disposed on the blade holder 3, and a positioning hole 21 is provided at the end of the blade 2 closest to the blade holder 3. One end of the limiting component 4 passes through the blade holder 3 and is inserted into the positioning hole 21 to limit the blade 2. In this embodiment, a baffle 31 is provided at the end of the blade holder 3 away from the blade 2 and on the side of the blade holder 3 in the width direction. One end of the blade 2 and the side in the width direction respectively abut against the baffle 31. At the same time, the limiting component 4 performs multi-point positioning of the blade 2, preventing the blade 2 from detaching from the baffle 31 and also preventing the blade 2 from shaking.

[0041] Please see Figure 2 and combined Figure 3 , Figure 5 , Figure 10As shown, the ejection assembly 5 is located inside the handle 1 and is used to control the rapid ejection or retraction of the blade holder 3, thereby causing the blade 2 to eject or retract rapidly, facilitating user operation. Specifically, the ejection assembly 5 includes a spring frame 51, a front spring hook 52, a rear spring hook 53, and a tension spring (not shown in the figure). The spring frame 51 is slidably disposed on one side of the bottom cover 11, and a slide rail 511 is provided on the side of the spring frame 51 closest to the blade holder 3. The axis of the slide rail 511 is parallel to the axis of the handle 1. A slider 32 is provided on the blade holder 3 and is slidably disposed within the slide rail 511. The front spring hook 52 and the rear spring hook 53 are slidably disposed on the other side of the spring frame 51, respectively. One end of the front spring hook 52 and the rear spring hook 53 passes through the spring frame 51 and extends to both ends of the slide rail 511 to restrict the slider 32 to slide within the slide rail 511. The two ends of the tension spring are connected to the front spring hook 52 and the rear spring hook 53 respectively (at this time, the tension spring is under stress). It should be noted that the front spring plate and the rear spring plate are respectively provided with fixing holes 521 at their respective ends that are close to each other. The two ends of the tension spring are hooked into the fixing holes 521. In addition, the end of the spring plate near the front spring hook 52 is provided with a through groove, and the end of the blade holder 1 near the rear spring hook 53 is provided with a clearance space. In this way, during the process of pushing the blade holder 3, the front spring hook 52 or the rear spring hook 53 can move in a direction away from each other and store force.

[0042] Please see Figures 2 to 4 As shown, the blade holder 3 has a first slot 33 and a second slot 34 at opposite corners on both sides along its length. The bottom cover 11 has a first locking block 7 and a second locking block 71 on both sides along its length. One end of the first locking block 7 and the second locking block 71 extends obliquely toward the corresponding first slot 33 or second slot 34. The spring frame 51 has abutment portions 512 on both sides that move one end of the first locking block 7 or the second locking block 71 away from the blade holder 3. That is, the abutment portions 512 of the spring frame 51 can move the locking blocks to unlock the blade holder 3. Specifically, each abutment portion 512 is an inclined surface formed on the corresponding side wall of the spring frame 51. The inclination direction of each abutment portion 512 is opposite to the inclination direction of the corresponding first locking block 7 or the second locking block 71, so as to push the locking block to unlock the blade holder 3.

[0043] For example, when it is necessary to retract the blade 2, push the spring frame 51 to slide away from the blade 2. At this time, the first locking block 7 is abutted by the corresponding abutment part 512. Continue to push the spring frame 51 (at this time, the tension spring continues to store force) until the first locking block 7 disengages from the first locking groove 33. At this time, the first locking block 7 releases the restriction on the blade holder 3. The blade holder 3, with the elasticity of the tension spring, quickly drives the blade holder 3 and the blade 2 to spring back into the inside of the handle 1 until the second locking block 71 is engaged in the second locking groove 34, making the blade holder 3 unable to move.

[0044] It should be noted that the bottom cover 11 is provided with receiving grooves 112 corresponding to the first locking block 7 and the second locking block 71, that is, the first locking block 7 and the second locking block 71 are respectively set in the receiving grooves 112. The receiving grooves 112 are provided with compression springs (not shown in the figure) for driving the first locking block 7 and the second locking block 71 to reset. That is, the two ends of the compression spring abut against the side wall of the receiving groove 112 and the side wall of the first locking block 7 or the second locking block 71, respectively, so that one end of the first locking block 7 or the second locking block 71 is always inclined and extended in the direction of the blade holder 3, so that after the abutment part 512 pushes the first locking block 7 or the second locking block 71, the first locking block 7 or the second locking block 71 can be quickly reset.

[0045] Preferably, a straight slot 113 is provided on one side of the bottom cover 11 in the width direction. A connecting piece 513 is fixed on the spring frame 51. The free end of the connecting piece 513 passes through the straight slot 113 and is fixed with a push button 54. The connecting piece 513 is slidably connected to the straight slot 113. This facilitates the user to push the spring frame 51.

[0046] Please see Figure 2 and Figure 4 As shown, in this embodiment, the limiting component 4 includes a blade locking shaft 41 and a fixing rod 42. The side wall of the blade locking shaft 41 near the blade holder 3 is defined as a first positioning surface. The first positioning surface is provided with first arc-shaped protrusions 411 on both radial sides. The blade holder 3 is provided with a through hole 35. The two arc-shaped protrusions 351 are provided on both radial sides of the through hole 35. Under normal conditions, the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 are arranged alternately. One end of the fixing rod 42 is screwed to the blade locking shaft 41, and the other end of the fixing rod 42 passes through the through hole 35 and is inserted into the positioning hole 21 to fix the blade 2.

[0047] Please see Figure 2 Combination Figures 6 to 11 As shown, the quick-release assembly 6 is rotatably mounted on the knife handle 1 and is used to drive the limiting assembly 4 to move away from the blade 2, thereby disengaging the fixing rod 42 of the limiting assembly 4 from the positioning hole 21 of the blade 2, so that the blade 2 can be removed or replaced. Specifically, the quick-release assembly 6 includes a quick-release linkage shaft 61 and a quick-release knob 62. The quick-release linkage shaft 61 is rotatably mounted inside the bottom cover 11, and the quick-release knob 62 is mounted on the outside of the bottom cover 11 relative to the quick-release linkage shaft 61. One end of the quick-release linkage shaft 61 is fixed with a polygonal insert rod 611, and the quick-release knob 62 has a first insertion hole 621 adapted to the insert rod 611 (i.e., the first insertion hole 621 is also polygonal). By setting the polygonal insert rod 611 and the polygonal first insertion hole 621, the quick-release knob 62 and the quick-release linkage shaft 61 can rotate synchronously. The outer side of the bottom cover 11 is also provided with a quick-release screw 63. One end of the insertion rod 611 passes through the bottom cover 11 and the first insertion hole 621 and is screwed to the quick-release screw 63.

[0048] The other end of the quick-release linkage shaft 61 is provided with an elongated relief groove 612, and the blade locking shaft 41 is provided with an elongated tenon 412. The relief groove 612 and the tenon 412 are coaxially arranged. When the blade 2 is in the extended state, the tenon 412 is slidably disposed in the relief groove 612. Through the cooperation of the tenon 412 and the relief groove 612, the quick-release knob 62, the quick-release linkage shaft 61, and the blade locking shaft 41 can rotate synchronously. When it is necessary to remove the blade 2, the blade 2 must first be adjusted to the extended position. At this time, the tenon 412 is slidably set in the relief groove 612. Then, the user rotates the quick release knob 62 (rotation angle is 90 degrees). The quick release knob 62 drives the quick release linkage shaft 61 and the blade locking shaft 41 to rotate synchronously, so that the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 are set opposite to each other. In this way, the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 abut against each other. Since the two second arc-shaped protrusions 351 are fixedly set on the blade holder 3, the blade holder 3 will not be displaced when the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 abut against each other. Instead, the blade locking shaft 41 will move away from the blade holder 3, so that the fixing rod 42 disengages from the positioning hole 21, thereby realizing the removal of the blade 2.

[0049] It should be noted that, under normal conditions, a recess is formed between the two first arc-shaped protrusions 411 or the two second arc-shaped protrusions 351 (not shown in the figure). When the two first arc-shaped protrusions 411 or the two second arc-shaped protrusions 351 are arranged in an alternating manner, the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 are respectively housed in the corresponding recess. In this embodiment, the thickness of the blade 2 is about 1mm to 2mm. Therefore, the protrusion height of the first arc-shaped protrusion 411 and the second arc-shaped protrusion 351 is about 1mm to 2mm to achieve the removal of the fixing rod 42 from the positioning hole 21.

[0050] In this embodiment, the bottom cover 11 has a through-hole 114. The insertion rod 611 passes through the through-hole 114 and is inserted into the first insertion hole 621. A fixing ring 115 is fixed on the inner wall of the through-hole 114. The side of the fixing ring 115 near the blade holder 3 is defined as the second positioning surface. The radial sides of the second positioning surface are respectively provided with third arc-shaped protrusions 1151. The quick-release connecting shaft 61 is located on both sides of the insertion rod 611 and is respectively provided with fourth arc-shaped protrusions 613. Under normal conditions, the two third arc-shaped protrusions 1151 and the two fourth arc-shaped protrusions 613 abut against each other.

[0051] The side of the fixing ring 115 away from the blade holder 3 is the third positioning surface. The radial sides of the third positioning surface are respectively provided with fifth arc-shaped protrusions 1152, and the sides of the first insertion hole 621 are respectively provided with sixth arc-shaped protrusions 622. Under normal conditions, the two fifth arc-shaped protrusions 1152 and the two sixth arc-shaped protrusions 622 are arranged alternately.

[0052] When it is necessary to disassemble the blade 2, turn the quick-release knob 62. The quick-release linkage shaft 61 rotates synchronously with the quick-release knob 62 via the insert rod 611. At this time, the fourth arc-shaped protrusion 613 on the quick-release linkage shaft 61 and the third arc-shaped protrusion 1151 on the second positioning surface are relatively displaced (staggered) to make room for the limiting component 4 to move away from the blade holder 3. At the same time, the sixth arc-shaped protrusion 622 on the quick-release knob 62 and the fifth arc-shaped protrusion 1152 on the third positioning surface abut against each other, thereby driving the quick-release linkage shaft 61 to move away from the blade holder 3. In other words, through the synchronous cooperation of the first arc-shaped protrusion 411 and the second arc-shaped protrusion 351, the third arc-shaped protrusion 1151 and the fourth arc-shaped protrusion 613, and the fifth arc-shaped protrusion 1152 and the sixth arc-shaped protrusion 622, the blade locking shaft 41 of the limiting component 4 moves away from the blade holder 3, thereby allowing the old blade 2 to be directly removed and the new blade 2 to be installed.

[0053] Preferably, the outer wall of the bottom cover 11 is recessed with a positioning groove 116. The quick-release assembly 6 also includes a quick-release spring plate 64, which is located between the quick-release screw 63 and the quick-release knob 62. One end of the quick-release spring plate 64 has a second insertion hole 641 that matches the insertion rod 611. One end of the insertion rod 611 passes through the first insertion hole 621 and the second insertion hole 641 and is screwed into the quick-release screw 63, so that the quick-release spring plate 64 and the insertion rod 611 rotate synchronously. The other end of the quick-release spring plate 64 extends with an arc-shaped positioning piece 642, the middle of which is engaged in the positioning groove 116. It should be noted that by engaging the middle of the arc-shaped positioning piece 642 in the positioning groove 116, the user is prevented from accidentally rotating the quick-release assembly 6, causing the blade 2 to fall off. In this embodiment, the arc-shaped positioning piece 642 is a metal or plastic spring with a certain degree of elasticity, and its middle part is slightly U-shaped. When it is necessary to rotate the quick-release assembly 6, the user needs to lift the quick-release spring piece 64 so that the arc-shaped positioning piece 642 is disengaged from the positioning groove 116 before the quick-release assembly 6 can be rotated. Preferably, two positioning rods 623 are fixedly provided at intervals on the side of the quick-release knob 62 near the positioning groove 116, and the arc-shaped positioning piece 642 is located between the two positioning rods 623 to ensure that the quick-release spring piece 64 drives the quick-release knob 62 to rotate stably.

[0054] In a specific implementation of this utility model, the user pushes the push button 54, which drives the spring frame 51 to slide within the bottom cover 11 via the connecting piece 513. As the spring frame 51 slides, the second locking block 71 is abutted by the corresponding abutting part 512. As the spring frame 51 continues to slide, the abutting part 512 pushes the second locking block 71 away from the blade holder 3, causing the second locking block 71 to disengage from the second slot 34 on the blade holder 3. At this point, the tension spring begins to release its elastic potential energy. Since the two ends of the tension spring are connected to the front spring hook 52 and the rear spring hook 53 respectively, the spring force will quickly eject the blade holder 3 along with the blade 2 from the handle 1, thus extending the blade 2. It should be noted that during the ejection process of the blade holder 3, the first locking block 7 engages in the first slot 33 on the blade holder 3 to prevent the blade holder 3 from ejecting excessively, keeping the blade holder 3 in a stable extended state for easy use of the blade 2.

[0055] At this time, the tenon 412 on the blade locking shaft 41 is located in the clearance groove 612 of the quick-release linkage shaft 61. When the blade 2 needs to be replaced, the user lifts the quick-release spring plate 64, causing the arc-shaped positioning plate 642 to disengage from the positioning groove 116, thus releasing the lock on the quick-release assembly 6. Then, the user rotates the quick-release knob 62. The quick-release knob 62, through the polygonal first insertion hole 621, cooperates with the insertion rod 611 of the quick-release linkage shaft 61 to make the quick-release linkage shaft 61 rotate synchronously (because the insertion rod 611 is compatible with the first insertion hole 621 and screwed onto the quick-release screw 63, it can rotate synchronously). When the quick-release linkage shaft 61 rotates, the fourth arc-shaped protrusion 613 on it and the third arc-shaped protrusion 1151 on the fixing ring 115 are relatively displaced, making room for the movement of the limiting assembly 4. At the same time, the sixth arc-shaped protrusion 622 on the quick-release knob 62 abuts against the fifth arc-shaped protrusion 1152 on the third positioning surface of the fixing ring 115, causing the quick-release linkage shaft 61 to move away from the blade holder 3.

[0056] Due to the cooperation of the tenon 412 and the relief groove 612, the quick-release linkage shaft 61 drives the blade locking shaft 41 to rotate synchronously, so that the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 are set opposite to each other. Even if the two first arc-shaped protrusions 411 and the two second arc-shaped protrusions 351 abut against each other, the blade locking shaft 41 moves away from the blade holder 3, thereby causing the fixing rod 42 to disengage from the positioning hole 21 of the blade 2. At this time, the old blade 2 can be directly removed.

[0057] When installing the new blade 2, place the new blade 2 into the blade holder 3, ensuring one end of the blade 2 abuts against the baffle 31 on the blade holder 3. Then, rotate the quick-release knob 62 in the opposite direction to reset the blade locking shaft 41, allowing the fixing rod 42 to re-insert into the positioning hole 21 of the blade 2, thus completing the blade 2 replacement. After replacement, lower the quick-release spring plate 64 to re-engage the arc-shaped positioning piece 642 into the positioning groove 116, preventing accidental operation.

[0058] The above description is only a preferred embodiment of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A straight jump cutter with easy blade replacement, comprising a handle (1) and a blade (2), wherein the handle (1) comprises a bottom cover (11) and a top cover (12), characterized in that, The blade holder (3) and the ejector assembly (5) for controlling the sliding of the blade holder (3) are slidably arranged inside the handle (1). The sliding direction of the blade holder (3) is parallel to the length direction of the handle (1). One end of the blade (2) is located on one side of the blade holder (3) and has a positioning hole (21). A limit assembly (4) is rotatably arranged on the blade holder (3). One end of the limit assembly (4) passes through the blade holder (3) and is inserted into the positioning hole (21). A quick-release assembly (6) for driving the limit assembly (4) to move away from the blade (2) is rotatably arranged on the handle (1). The bottom cover (11) is provided with a sliding groove (111). The blade holder (3) and the blade (2) are slidably disposed in the sliding groove (111). The limiting component (4) includes a blade locking shaft (41) and a fixing rod (42). The side wall of the blade locking shaft (41) near the blade holder (3) is a first positioning surface. The first positioning surface is provided with first arc-shaped protrusions (411) on both radial sides. The blade holder (3) is provided with a through hole (35). The through hole (35) is provided with second arc-shaped protrusions (351) on both radial sides. Under normal conditions, the two first arc-shaped protrusions (411) and the two second arc-shaped protrusions (351) are arranged alternately. One end of the fixing rod (42) is screwed to the blade locking shaft (41), and the other end of the fixing rod (42) passes through the through hole (35) and is inserted into the positioning hole (21). The quick-release assembly (6) includes a quick-release connecting shaft (61) rotatably disposed inside the bottom cover (11) and a quick-release knob (62) rotatably disposed outside the bottom cover (11). One end of the quick-release connecting shaft (61) is fixedly provided with a polygonal insert (611). The quick-release knob (62) has a first insertion hole (621) adapted to the insert (611). The bottom cover (11) is also provided with a quick-release screw (63). The insert (611) One end passes through the bottom cover (11) and the first insertion hole (621) and is screwed to the quick-release screw (63). The other end of the quick-release linkage shaft (61) is provided with a long strip-shaped relief groove (612). The blade locking shaft (41) is provided with a long strip-shaped protrusion (412). The relief groove (612) and the protrusion (412) are coaxial. When the blade (2) is in the extended state, the protrusion (412) is slidably disposed in the relief groove (612).

2. The straight jump cutter with convenient blade replacement according to claim 1, characterized in that, The bottom cover (11) has a through-hole (114) on its inner and outer sides. The insertion rod (611) passes through the through-hole (114) and is inserted into the first insertion hole (621). A fixing ring (115) is fixed on the inner wall of the through-hole (114). The side of the fixing ring (115) near the blade holder (3) is a second positioning surface. The radial sides of the second positioning surface are respectively provided with third arc-shaped protrusions (1151). The quick-release connecting shaft (61) is located on both sides of the insertion rod (611) and is respectively provided with fourth arc-shaped protrusions (613). Under normal conditions, the two third arc-shaped protrusions (1151) and the two fourth arc-shaped protrusions (613) abut against each other.

3. The straight jump cutter with convenient blade replacement according to claim 2, characterized in that, The side of the fixing ring (115) away from the blade holder (3) is the third positioning surface. The radial sides of the third positioning surface are respectively provided with fifth arc-shaped protrusions (1152). The sides of the first insertion hole (621) are respectively provided with sixth arc-shaped protrusions (622). Under normal conditions, the two fifth arc-shaped protrusions (1152) and the two sixth arc-shaped protrusions (622) are arranged alternately.

4. The straight jump cutter with convenient blade replacement according to claim 3, characterized in that, The outer side wall of the bottom cover (11) is recessed with a positioning groove (116). The quick-release assembly (6) also includes a quick-release spring plate (64). The quick-release spring plate (64) is located between the quick-release screw (63) and the quick-release knob (62). One end of the quick-release spring plate (64) is provided with a second insertion hole (641) that is compatible with the insertion rod (611). One end of the insertion rod (611) passes through the first insertion hole (621) and the second insertion hole (641) and is screwed to the quick-release screw (63). The other end of the quick-release spring plate (64) extends with an arc-shaped positioning piece (642). The middle part of the arc-shaped positioning piece (642) is engaged in the positioning groove (116).

5. The straight jump cutter with convenient blade replacement according to claim 4, characterized in that, Two positioning rods (623) are fixed at intervals on one side of the quick-release knob (62) near the positioning groove (116), and the arc-shaped positioning piece (642) is located between the two positioning rods (623).

6. The straight jump cutter with convenient blade replacement according to claim 1, characterized in that, The ejection assembly (5) includes a spring frame (51), a front spring hook (52), a rear spring hook (53), and a tension spring. The spring frame (51) is slidably disposed on one side of the bottom cover (11), and a slide rail (511) is provided on the side of the spring frame (51) near the blade holder (3). A slider (32) is provided on the blade holder (3), and the slider (32) is slidably disposed in the slide rail (511). The front spring hook (52) and the rear spring hook (53) are slidably disposed on the other side of the spring frame (51). One end of the front spring hook (52) and the rear spring hook (53) respectively passes through the spring frame (51) and extends to both ends of the slide rail (511). The two ends of the tension spring are respectively connected to the front spring hook (52) and the rear spring hook (53). The blade holder (3) has a first slot (33) and a second slot (34) at opposite corners on both sides of its length direction. The bottom cover (11) has a first block (7) and a second block (71) on both sides of its length direction. One end of the first block (7) and the second block (71) extends obliquely toward the corresponding first slot (33) or second slot (34). The spring frame (51) has a contact part (512) on both sides that moves one end of the first block (7) or the second block (71) away from the blade holder (3).

7. The straight jump cutter with convenient blade replacement according to claim 6, characterized in that, Each of the abutting parts (512) is an inclined surface formed on the corresponding side wall of the spring frame (51), and the inclination direction of each abutting part (512) is opposite to the inclination direction of the corresponding first locking block (7) or second locking block (71).

8. The straight jump cutter with convenient blade replacement according to claim 7, characterized in that, The bottom cover (11) has a straight slot (113) on one side in the width direction. A connecting piece (513) is fixed on the spring frame (51). The free end of the connecting piece (513) passes through the straight slot (113) and is fixed with a push button (54). The connecting piece (513) is slidably connected to the straight slot (113).

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