A safety knife

Abstract

The utility model discloses a safe knife belongs to safe knife technical field, including knife handle main part and knife head subassembly, be equipped with cutting knife subassembly on the knife handle main part, and cutting knife subassembly includes elastic connecting handle, and the one end fixed connection of elastic connecting handle is in the knife handle main part, and the other end of elastic connecting handle is equipped with the blade to the knife handle main part, and be equipped with the abutting portion corresponding with the blade on the knife handle main part, and the blade can be along with elastic connecting handle and abutting portion contact or separate. In the scheme, knife head subassembly can be used for unloading operation, and cutting knife subassembly can be used for bagging operation, and elastic connecting handle has certain elastic force, and when pressing, can make the blade on cutting knife subassembly and the abutting portion on the knife handle main part contact, and when loosening, the blade is separated with the abutting portion again, and the bag mouth of bag body is placed in the position of abutting portion, just can make the blade cut the bag body flat, not only has higher bag opening efficiency, but also can make the incision of bag body flat.

Description

Technical Field

[0001] This utility model relates to a knife, and more specifically, to a safety knife. Background Technology

[0002] Safety knives are common tools used for unpacking boxes and bags. Existing safety knives typically have only one set of blades, and only this set is used for unpacking. When unpacking a box, the tip of the blade pierces the box, and then the sides tear the box open. However, packaging bags do not have the same rigidity as boxes. Using the tip of the blade can only pierce the bag; tearing it with the sides often results in uneven cuts, making the bag difficult to handle and recycle.

[0003] For example, Chinese Patent Publication No. CN216634486U, published on May 31, 2022, entitled "A Safety Knife with an Aluminum Handle," discloses a safety knife structure including a handle and a blade head mounted on the handle. The blade head includes a blade and a protective shell, with the protective shell covering at least a portion of the blade. The protective shell has at least one notch, and the cutting edge of at least a portion of the blade is located within the notch. This solution eliminates the need for manual blade operation, allowing direct use of the safety knife to cut tape, cable ties, and other materials on cartons, as well as directly on the cartons themselves. However, this solution is not suitable for cutting and disassembling packaging bags or soft, sealed bags, and the cut on the bag after disassembly is not smooth, hindering subsequent processing and recycling. Utility Model Content

[0004] This invention overcomes the problem that existing safety knives are inconvenient for cutting bagged packaging, and provides a safety knife that can quickly cut bagged packaging with a clean cut, which is beneficial for the recycling and disposal of the bag.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a safety knife, including a handle body and a blade assembly. The handle body is provided with a cutting blade assembly, which includes an elastic connecting handle. One end of the elastic connecting handle is fixedly connected to the handle body, and the other end of the elastic connecting handle is provided with a blade facing the handle body. The handle body is provided with an abutment portion corresponding to the blade, and the blade can contact or separate from the abutment portion along with the elastic connecting handle. In this solution, the blade assembly can be used for unpacking operations, and the cutting blade assembly can be used for bag opening operations. The elastic connecting handle has a certain elastic force, which allows the blade on the cutting blade assembly to contact the abutment portion on the handle body when pressed, and the blade to separate from the abutment portion when released. By placing the bag opening at the abutment portion, the blade can make a flat cut on the bag, which not only has high bag opening efficiency but also makes the cut of the bag flat.

[0006] Preferably, the cutter assembly further includes a blade mounting base integrated with the elastic connecting handle. The blade mounting base has a positioning post and a locking block adapted to the blade mounting base. The blade is disposed on the positioning post and located between the blade mounting base and the locking block. The blade mounting base is used to mount the blade, and the blade is arranged on the positioning post and locked by the locking block to achieve a detachable connection, which not only ensures the stability of the blade but also facilitates blade replacement.

[0007] Preferably, a connecting rib is provided between the blade mounting seat and the elastic connecting handle on the side away from the locking block. The connecting rib between the blade mounting seat and the elastic connecting handle can improve the structural strength and stability between the blade mounting seat and the elastic connecting handle, and prevent the blade mounting seat from shifting or deforming during bag opening.

[0008] Preferably, the elastic connecting handle has a pressing part on the side corresponding to the blade position and away from the blade. The pressing part is concave and has striped patterns. The pressing part on the elastic connecting handle can press the cutting assembly onto the handle body, thereby enabling the blade to cut the bag. The concave shape and striped patterns of the pressing part can increase the friction of the pressing part with the user, making it easier to move the cutting assembly to make long strip cuts on the bag.

[0009] Preferably, the handle body can be snapped together with the cutting assembly at the position corresponding to the blade. The handle body and the cutting assembly are connected by a snap-fit ​​mechanism. When the cutting assembly is needed, it is detached from the handle body and can be used normally. When the cutting assembly is not needed, it is locked onto the handle body by the snap-fit ​​mechanism to prevent it from interfering with unpacking or accidentally injuring the user.

[0010] Preferably, the abutment portion is provided with a receiving groove, the depth of which is greater than the length of the blade. The receiving groove can accommodate the corresponding blade structure, and the depth of the receiving groove being greater than the length of the blade can prevent the blade from contacting the bottom of the receiving groove and damaging the blade.

[0011] Preferably, the cutter assembly and the handle body are detachably connected. The cutter assembly and the handle body are detachably connected by a snap-fit ​​mechanism. When one of the structures is damaged, only the damaged part needs to be replaced, which simplifies maintenance and reduces operating costs.

[0012] Preferably, the blade assembly includes a first blade and second blades symmetrically distributed on both sides of the first blade, wherein the cutting edges of the first and second blades are in opposite directions. The blade assembly on the handle body can be used to disassemble the box, wherein the first blade can be used to pierce the box, and the second blade can be used to tear and cut the pierced box.

[0013] Preferably, the handle body has a through hole on the side away from the blade assembly. The through hole on the handle body can be used for hanging and storing the safety knife.

[0014] Preferably, the knife handle body has spaced concave grooves on both sides. These grooves improve the user's grip on the knife handle body, preventing slippage and enhancing the safety of using the safety knife.

[0015] Compared with the prior art, the beneficial effects of this utility model are: (1) the elastic connecting handle and the knife handle body can be disassembled by pressing the knife assembly to disassemble sealed bag items, which improves the disassembly effect of the safety knife on bag items and makes the cut flat; (2) the structure design is simple and the cost is low. The unpacking operation and the unpacking operation do not affect each other; (3) it has higher safety performance and can avoid the knife structure from accidentally injuring the user. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is a side view of the present invention.

[0018] Figure 3 This is a top view of the present invention.

[0019] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0020] Figure 5 This is a schematic diagram from another perspective of the present invention.

[0021] Figure 6This is a schematic diagram of Embodiment 2 of the present invention.

[0022] In the picture: 1. Tool holder body; 11. Abutment part; 111. Receiving groove; 12. Through hole; 13. Concave groove; 14. Second retaining groove; 2. Cutter head assembly; 21. First cutter body; 22. Second cutter body; 3. Cutter assembly, 31. Flexible connecting handle, 32. Blade, 33. Blade mounting base, 331. Positioning post, 34. Locking block, 35. Connecting rib, 36. Pressing part, 361. Recess, 362. Striped pattern, 37. Locking element, 38. First slot. Detailed Implementation

[0023] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0024] Example 1: As Figures 1 to 5 The safety knife shown includes a handle body 1 and a cutting assembly 3 disposed on the handle body 1. The handle body 1 has a long, flat structure. The cutting assembly 3 is disposed on one side surface of the handle body 1. Specifically, the cutting assembly 3 includes an elastic connecting handle 31, which has a long, strip-shaped structure and is nearly parallel to the handle body 1. One end of the elastic connecting handle 31 is fixedly connected to the handle body 1, and the other end of the elastic connecting handle 31 is separated from the handle body 1 when no force is applied. A blade 32 is disposed at this end of the elastic connecting handle 31. By pressing the separated end of the elastic connecting handle 31 from the handle body 1, the elastic connecting handle 31 can be brought close to the surface of the handle body 1, causing the blade 32 to contact the handle body 1. Thus, the blade 32 can cut open a bag placed between the blade 32 and the handle body 1.

[0025] The knife handle body 1 is provided with a blade assembly 2 and a cutting blade assembly 3. The blade assembly 2 is located at the end of the knife handle body 1 along its length, while the cutting blade assembly 3 is located on the flat surface of the knife handle body 1. The blade assembly 2 can be used to disassemble the box structure to realize the box opening operation; the cutting blade assembly 3 can be used to disassemble the bag structure to realize the bag opening operation.

[0026] The elastic connecting handle 31 of the cutter assembly 3 is made of elastic plastic. It has a certain structural strength and a certain elastic deformation capability. When the elastic connecting handle 31 is pressed, the elastic connecting handle 31 will swing around the fixed point with the handle body 1. When the elastic connecting handle 31 is no longer pressed, the elastic connecting handle 31 can automatically return to the state where the blade 32 is separated from the handle body 1.

[0027] The end of the flexible connecting handle 31 where the blade 32 is arranged is on the same side as the end of the handle body 1 where the blade head assembly 2 is arranged, which facilitates the operation of unpacking and unpacking, and the structure is reasonably arranged.

[0028] A blade mounting seat 33 is also provided on the flexible connecting handle 31, such as Figure 2 or Figure 5 As shown, the mounting surface of the blade mounting base 33 is arranged vertically. A positioning post 331 and a blade groove adapted to the blade 32 are provided on the mounting surface of the blade mounting base 33. The axial direction of the positioning post 331 is arranged horizontally, that is, perpendicular to the mounting surface of the blade mounting base 33. The blade 32 is provided with a positioning hole adapted to the cross section of the positioning post 331. The blade is positioned on the positioning post 331 through the positioning hole. A locking block 34 is also provided on the side of the blade 32 away from the blade mounting base 33 to lock the blade 32 and prevent the blade 32 from loosening. Specifically, the shape of the locking block 34 is adapted to the shape of the blade mounting base 33. This not only enables good positioning of the blade 32 on the blade mounting base 33, but also improves the overall aesthetics of the cutting assembly 3. Locking holes are also provided on the blade mounting base 33 and the locking block 34. The locking block 34 and the blade mounting base 33 can be further locked by the locking element 37 (locking pin or locking nail, etc.) to prevent the locking block 34 from loosening. In order to improve the locking effect, two sets of locking holes and corresponding locking elements 37 can be provided.

[0029] In order to improve the positioning effect of the positioning post 331 on the blade 32, the cross section of the positioning post 331 can be designed as an elongated oval shape, which can effectively prevent the blade 32 from deflecting during use; or the shape of the positioning post 331 is circular, and the number of positioning posts 331 can be designed as two sets, which can also achieve a good positioning effect on the blade 32 and prevent the blade 32 from deflecting during use.

[0030] After the blade 32 is installed in place, the cutting edge of the blade 32 should be exposed on the side of the blade mounting seat 33 facing the handle body 1. That is, the cutting edge of the blade 32 should face the handle body 1 and be located outside the gap between the blade mounting seat 33 and the locking block 34, so that the blade 32 can cut the bag. The exposed blade 32 is triangular in shape, which makes it easier for the blade 32 to pierce the bag.

[0031] Furthermore, an abutment portion 11 is provided on the surface of the blade holder body 1 on the side where the cutting blade assembly 3 is arranged. The position of the abutment portion 11 corresponds to the position of the blade 32, and the abutment portion 11 has a relatively flat structure. When the user presses the elastic connecting handle 31, the end of the elastic connecting handle 31 where the blade 32 is arranged moves toward the blade holder body 1, which allows the blade 32 to contact the abutment portion 11 on the blade holder body 1 and generate a certain squeezing cutting force. When using the cutter assembly 3, the user simply places the packaging bag to be cut on the abutment part 11, then presses the elastic connecting handle 31, causing the blade 32 on the elastic connecting handle 31 to contact the abutment part 11 on the handle body 1. At this point, the blade 32 on the elastic connecting handle 31 can pierce the opening of the packaging bag. By continuing to press the elastic connecting handle 31, the blade 32 remains in contact with the abutment part 11. Then, by moving the safety knife (or the bag) laterally (in the direction of the blade 32's cutting edge), the blade 32 can cut a long and clean slit in the bag. This method of disassembling the bag is not only very simple and efficient but also highly safe.

[0032] Example 2: Figures 1 to 5 The safety knife shown includes a handle body 1 and a cutting assembly 3 disposed on the handle body 1. The handle body 1 has a long, flat structure. The cutting assembly 3 is disposed on one side surface of the handle body 1. Specifically, the cutting assembly 3 includes an elastic connecting handle 31, which has a long, strip-shaped structure and is nearly parallel to the handle body 1. One end of the elastic connecting handle 31 is fixedly connected to the handle body 1, and the other end of the elastic connecting handle 31 is separated from the handle body 1 when no force is applied. A blade 32 is disposed at this end of the elastic connecting handle 31. By pressing the separated end of the elastic connecting handle 31 from the handle body 1, the elastic connecting handle 31 can be brought close to the surface of the handle body 1, causing the blade 32 to contact the handle body 1. Thus, the blade 32 can cut open a bag placed between the blade 32 and the handle body 1.

[0033] The knife handle body 1 is provided with a blade assembly 2 and a cutting blade assembly 3. The blade assembly 2 is located at the end of the knife handle body 1 along its length, while the cutting blade assembly 3 is located on the flat surface of the knife handle body 1. The blade assembly 2 can be used to disassemble the box structure to realize the box opening operation; the cutting blade assembly 3 can be used to disassemble the bag structure to realize the bag opening operation.

[0034] The elastic connecting handle 31 of the cutter assembly 3 is made of elastic plastic. It has a certain structural strength and a certain elastic deformation capability. When the elastic connecting handle 31 is pressed, the elastic connecting handle 31 will swing around the fixed point with the handle body 1. When the elastic connecting handle 31 is no longer pressed, the elastic connecting handle 31 can automatically return to the state where the blade 32 is separated from the handle body 1.

[0035] A blade mounting seat 33 is also provided on the flexible connecting handle 31, such as Figure 2 or Figure 5 As shown, the mounting surface of the blade mounting base 33 is arranged vertically. A positioning post 331 and a blade groove adapted to the blade 32 are provided on the mounting surface of the blade mounting base 33. The axial direction of the positioning post 331 is arranged horizontally, that is, perpendicular to the mounting surface of the blade mounting base 33. The blade 32 is provided with a positioning hole adapted to the cross section of the positioning post 331. The blade is positioned on the positioning post 331 through the positioning hole. A locking block 34 is also provided on the side of the blade 32 away from the blade mounting base 33 to lock the blade 32 and prevent the blade 32 from loosening. Specifically, the shape of the locking block 34 is adapted to the shape of the blade mounting base 33. This not only enables good positioning of the blade 32 on the blade mounting base 33, but also improves the overall aesthetics of the cutting assembly 3. Locking holes are also provided on the blade mounting base 33 and the locking block 34, which can be further locked by the locking element 37 (locking pin or locking nail, etc.) to prevent the locking block 34 from loosening.

[0036] A contact portion 11 is provided on the surface of the blade assembly 3 on the side of the handle body 1. The position of the contact portion 11 corresponds to the position of the blade 32, and the contact portion 11 has a relatively flat structure. When the user presses the elastic connecting handle 31, the end of the elastic connecting handle 31 where the blade 32 is located moves toward the handle body 1, so that the blade 32 contacts the contact portion 11 on the handle body 1 and generates a certain squeezing cutting force. When using the blade assembly 3, the user only needs to place the packaging bag to be cut on the contact portion 11, and then press the elastic connecting handle 31 so that the blade 32 on the elastic connecting handle 31 contacts the contact portion 11 on the handle body 1. At this time, the blade 32 on the elastic connecting handle 31 can pierce the opening of the packaging bag. Then, by continuing to press the elastic connecting handle 31, the blade 32 continues to contact the contact portion 11, and then the safety knife (or the bag) moves laterally (in the direction of the blade edge of the blade 32), so that the blade 32 can cut a long and flat slit on the bag. This method of disassembling the bag is not only very simple and efficient, but also highly safe.

[0037] like Figure 1 or Figure 3As shown, the blade assembly 2 includes a first blade body 21 and a second blade body 22. Two sets of the second blade bodies 22 are symmetrically arranged on both sides of the first blade body 21. The first blade body 21 has a pointed structure, which can be used to pierce the box. The second blade body 22 is barbed, so that the cutting edge direction of the first blade body 21 is opposite to that of the second blade body 22, which can be used for reverse cutting of the box. A certain gap is maintained between the second blade body 22 and the handle body 1, thereby accommodating objects such as boxes or tape of a certain thickness, facilitating cutting by the second blade body 22.

[0038] A connecting rib 35 is provided between the blade mounting base 33 and the elastic connecting handle 31. The connecting rib 35 is located on the side of the blade mounting base 33 away from the locking block 34. The connecting rib 35 between the blade mounting base 33 and the elastic connecting handle 31 can improve the structural strength and stability between the blade mounting base 33 and the elastic connecting handle 31, and prevent the blade mounting base 33 from shifting or deforming during the bag opening process. At the same time, a pressing part 36 is provided at the end of the elastic connecting handle 31 where the blade 32 is located. The pressing part 36 is located on the upper side of the elastic connecting handle 31 (that is, on the side away from the blade 32). The pressing part 36 has an arc-shaped recess 361 structure, and several parallel stripes 362 are provided on the recess 361. The pressing part 36 on the elastic connecting handle 31 can press the cutter assembly 3 onto the handle body 1, so that the blade 32 can cut the bag. The pressing part 36 is concave and has striped patterns, which can increase the friction of the user on the pressing part 36 and facilitate the movement of the cutter assembly 3 to make long strip cuts on the bag.

[0039] The cutting blade assembly 3 and the fixed end of the handle body 1 are designed to be detachably fixedly connected, specifically, as follows: Figure 4 As shown, two sets of snap-fit ​​holes are provided on the tool holder body 1. The elastic connecting handle 31 and the fixed end of the tool holder body 1 are provided with snap-fit ​​pins. Through the snap-fit ​​pins and snap-fit ​​holes, the elastic connecting handle 31 and the tool holder body 1 can be detached. When one set of structures is damaged, only the damaged part needs to be replaced, which is simple to maintain and has low operating costs.

[0040] An approximately circular through hole 12 is provided at the end of the handle body 1 away from the blade assembly 2. The through hole 12 can be used for hanging and storing the safety knife. At the same time, several spaced concave grooves 13 are provided on both sides of the handle body 1 in the width direction. The concave grooves 13 can improve the user's grip on the handle body 1, making the handle body 1 less likely to slip and improving the safety performance of using the safety knife.

[0041] Example 3: As Figure 6As shown, based on Embodiment 1 or Embodiment 2, the handle body 1 and the cutting blade assembly 3 can be connected by a snap-fit, which can fix and separate the handle body 1 corresponding to the blade 32 position and the cutting blade assembly 3. When the cutting blade assembly 3 needs to be used, the snap-fit ​​connection between the cutting blade assembly 3 and the handle body 1 is released. When the cutting blade assembly 3 is not needed, the snap-fit ​​connection between the cutting blade assembly 3 and the handle body 1 is re-engaged.

[0042] Specifically, the bottom of the locking block 34 of the cutter assembly 3 and the upper surface of the handle body 1 are provided with mutually cooperating slot structures. The slot on the locking block 3 is the first slot 38, and the slot on the handle body 1 is the second slot 14. The slots of the first slot 38 and the second slot 14 are opposite in direction, and a guide slope is provided on the side of the first slot 38 and the second slot 14 that are close to each other. In this way, when the elastic connecting handle 31 is pressed, the locking block 34 on the cutter assembly 3 approaches the handle body 1, and under the action of the guide slope of the first slot 38 and the second slot 14, the first slot 38 enters the second slot 14, and the first slot 38 and the second slot 14 are engaged together. In this way, the end of the elastic connecting handle 31 where the cutter 32 is located can be fixed to the handle body 1. When opening the box, the cutter assembly 3 can be prevented from interfering with the opening operation, and it is also convenient for storing the safety knife.

[0043] Meanwhile, a receiving groove 111 structure needs to be provided on the abutment portion 11 of the knife handle body 1 to accommodate the blade structure. When the elastic connecting handle 31 is pressed so that the end of the blade 32 contacts the end of the knife handle body 1, the blade 32 is in contact with the abutment portion 11. By providing the receiving groove 111, the blade 32 can be stored in the receiving groove 111, and the design of the receiving groove 111 will not affect the bag opening operation. The depth of the receiving groove 111 needs to be greater than the length of the blade 32 (the exposed length) to avoid the blade 32 contacting the bottom of the receiving groove 111 and damaging the blade.

Claims

1. A safety knife, comprising a handle body and a blade assembly, characterized in that, The knife handle body is provided with a cutting blade assembly, which includes an elastic connecting handle. One end of the elastic connecting handle is fixedly connected to the knife handle body, and the other end of the elastic connecting handle is provided with a blade facing the knife handle body. The knife handle body is provided with an abutment portion corresponding to the blade, and the blade can contact or separate from the abutment portion along with the elastic connecting handle.

2. A safety knife according to claim 1, characterized in that, The cutting assembly also includes a blade mounting base integrated with the elastic connecting handle. The blade mounting base is provided with a positioning post and a locking block adapted to the blade mounting base. The blade is disposed on the positioning post and located between the blade mounting base and the locking block.

3. A safety knife according to claim 2, characterized in that, A connecting rib is provided between the blade mounting seat on the side away from the locking block and the elastic connecting handle.

4. A safety knife according to claim 1, characterized in that, The elastic connecting handle has a pressing part on the side corresponding to the blade position and away from the blade. The pressing part is a concave part and has striped patterns.

5. A safety knife according to claim 1, characterized in that, The handle body can be snapped into the cutting blade assembly at the position corresponding to the blade.

6. A safety knife according to claim 5, characterized in that, The abutment portion is provided with a receiving groove, the depth of which is greater than the length of the blade.

7. A safety knife according to any one of claims 1 to 6, characterized in that, The cutting blade assembly is detachably connected to the blade handle body.

8. A safety knife according to any one of claims 1 to 6, characterized in that, The blade assembly includes a first blade body and a second blade body symmetrically distributed on both sides of the first blade body, wherein the cutting edges of the first blade body and the second blade body are opposite in direction.

9. A safety knife according to any one of claims 1 to 6, characterized in that, The handle body has a through hole on the side away from the cutter head assembly.

10. A safety knife according to any one of claims 1 to 6, characterized in that, The main body of the knife handle has spaced concave grooves on both sides.

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