cutter

Abstract

The knife of the present application comprises a handle body, a blade telescopically arranged in the handle body, and an operating knob combined with the handle body and movable between a locking position and an unlocking position. When the blade is in the out-knife state and the operating knob is in the locking position, the blade is restricted by the stop structure and cannot swing towards the first out-knife part or the second out-knife part, and the blade can telescopically move relative to the stop structure. When the blade is in the in-knife state and the operating knob is in the locking position, the stop structure is located on the out-knife path, thereby maintaining the blade in the in-knife state. Thus, the present application effectively improves the problem that the existing knife cannot simultaneously consider the stability of the blade during use, the convenience of operation, and the safety during non-use.

Description

Technical Field

[0001] This invention relates to the field of cutting tool technology, and more particularly to a cutting tool. Background Technology

[0002] Existing retractable knives, such as utility knives, include a handle, an adjuster, and a blade. The adjuster and the blade are located inside the handle, and the adjuster is used to drive the blade to extend or retract relative to the handle, so that the blade protrudes outside the handle for the user to operate, or retracts completely into the handle for easy carrying and storage.

[0003] Chinese utility model patent with publication number CN 208867220 U discloses a utility knife with a locking nut. In addition to the aforementioned mechanism, the utility knife also includes a knob located behind the handle. When the user rotates the knob, it can activate a locking rod, which fixes the blade in place, preventing the blade from automatically extending or retracting during use or from wobbling due to gaps, thus affecting the cutting accuracy.

[0004] However, the aforementioned utility knife with a locking nut has a complex structure and numerous parts, which not only makes it inconvenient to manufacture and assemble, but also requires repeated back-and-forth rotation of the knob to clamp or release the blade. Furthermore, it lacks clear feedback, requiring the user to repeat the rotation several times to confirm that the blade is properly secured or can be freely extended or retracted. Therefore, the aforementioned utility knife still has shortcomings in both manufacturing and use.

[0005] Furthermore, US Patent Publication No. US08793881B2 discloses a utility knife with a blade lock. This utility knife includes a push block, which the user can press after the blade extends from the handle to lock and secure the blade, facilitating cutting operations. However, the push block of this utility knife locks the blade, and if the user wants to extend or retract the blade, the push block must be pushed back to the unlocked position, which is not conducive to fine-tuning during use.

[0006] In conclusion, existing knives, such as utility knives, cannot simultaneously ensure blade stability during use, ease of operation, and safety when not in use, and therefore have areas that need improvement. Summary of the Invention

[0007] To address the problem that existing cutting tools cannot simultaneously ensure blade stability during use, ease of operation, and safety when not in use, this invention provides a cutting tool with a blade stabilizing mechanism, which effectively improves the aforementioned problems, as further explained below.

[0008] This invention provides a cutting tool, which includes:

[0009] A knife handle body has a blade receiving space inside. The front end of the knife handle body has a first blade extension part and a second blade extension part located on opposite sides, and a blade extension opening is formed between the first blade extension part and the second blade extension part. The blade extension opening is connected to the blade receiving space.

[0010] A blade, capable of moving back and forth along a cutting path between a cutting opening and a blade receiving space, the blade extending out of the cutting opening of the handle body in a cutting-out state, and retracting into the cutting opening in a retracted state; and

[0011] An operating button is attached to the handle body and is located on the same side of the handle body as the first blade extension part. The operating button can move between a locked position and an unlocked position. The operating button includes a protrusion with a blade-stopping structure and a blade-blocking structure. When the operating button is in the locked position, the protrusion interferes with the blade extension path, and the blade-blocking structure can elastically deform to change its position relative to the blade-stopping structure.

[0012] Specifically, when the blade is in the extended state and the operation button is in the locked position, the blade is restricted by the abutment structure and cannot swing toward the first or second extended part, and the blade can extend and retract relative to the abutment structure; when the blade is in the retracted state and the operation button is in the locked position, the abutment structure is located on the extended path, thereby maintaining the blade in the retracted state.

[0013] Through the above-described technical features, the present invention has at least the following beneficial effects:

[0014] When the operating button is in the locked position and the blade is in the extended state, the blade is restrained by the blade-stopping structure and will not wobble arbitrarily, facilitating high-precision cutting operations. Furthermore, the user can adjust the blade's extension or retraction according to usage conditions or needs without first adjusting the position of the operating button, making the blade easy to operate. When the operating button is in the locked position and the blade is in the retracted state, the blade-stopping structure of the operating button prevents the blade from extending, thus preventing accidental blade extension and potential injury to personnel or objects while the user is carrying the blade. In addition, the blade-stopping structure can elastically deform to change its position relative to the blade-stopping structure, allowing the blade stabilization and blade-stopping functions to be controlled separately, thereby improving the quality of blade stabilization and blade-stopping through separation deformation. Therefore, this invention effectively improves the problem that existing blades cannot simultaneously achieve blade stability during use, ease of operation, and safety when not in use, thus providing a blade that balances these three aspects. Attached Figure Description

[0015] Figure 1 This is a perspective view of the first preferred embodiment of the present invention.

[0016] Figure 2 This is a partially enlarged, exploded perspective view of the first preferred embodiment of the present invention, with some blades omitted.

[0017] Figure 3 This is an enlarged partial side cross-sectional view of the first preferred embodiment of the present invention, wherein the blade is in the extended position and the operation button is in the unlocked position.

[0018] Figure 4 This is an enlarged partial side cross-sectional view of the first preferred embodiment of the present invention, wherein the blade is in the extended state and the operation button is in the locked position.

[0019] Figure 5 This is an enlarged partial side cross-sectional view of the first preferred embodiment of the present invention, in which the blade is in the retracted state and the operation button is in the locked position.

[0020] Figure 6 This is a perspective view of the second preferred embodiment of the present invention.

[0021] Figure 7 This is a partially enlarged top view of the second preferred embodiment of the present invention.

[0022] Figure 8 This is a bottom perspective view of the operation button in the second preferred embodiment of the present invention.

[0023] Figure 9 This is a partial three-dimensional cross-sectional view of the second preferred embodiment of the present invention.

[0024] Figure 10 This is a perspective view of the third preferred embodiment of the present invention.

[0025] Figure 11 This is a partially enlarged top view of the third preferred embodiment of the present invention.

[0026] Figure 12 This is a perspective view of the fourth preferred embodiment of the present invention.

[0027] Figure 13 This is a partially enlarged top view of the fourth preferred embodiment of the present invention.

[0028] Figure 14 This is a partially enlarged, exploded perspective view of the fourth preferred embodiment of the present invention, with some blades omitted.

[0029] Figure 15 This is a partially enlarged side view of the fourth preferred embodiment of the present invention.

[0030] Figure 16This is a partially enlarged top view of the fifth preferred embodiment of the present invention.

[0031] Figure 17A This is a bottom perspective view of the operation button in the sixth preferred embodiment of the present invention.

[0032] Figure 17B This is an enlarged partial side cross-sectional view of the sixth preferred embodiment of the present invention.

[0033] Figure 18 This is a partial perspective cross-sectional view of the seventh preferred embodiment of the present invention.

[0034] Figure 19 This is a partially enlarged, exploded perspective view of the seventh preferred embodiment of the present invention, with some blades omitted.

[0035] Figure 20 This is an enlarged partial side cross-sectional view of the seventh preferred embodiment of the present invention, in which the blade is in the extended position and the operation button is in the unlocked position.

[0036] Figure 21 This is an enlarged partial side cross-sectional view of the seventh preferred embodiment of the present invention, in which the blade is in the extended state and the operation button is in the locked position.

[0037] Figure 22 This is an enlarged partial side cross-sectional view of the seventh preferred embodiment of the present invention, in which the blade is in the retracted state and the operation button is in the locked position.

[0038] Figure 23 This is an enlarged partial cross-sectional perspective view of the seventh preferred embodiment of the present invention.

[0039] Symbol explanation:

[0040] 10, 10A, 10B, 10C, 10D, 10E, 10F: Handle body

[0041] 101: Blade housing space

[0042] 102: Side view

[0043] 11, 11A, 11B, 11C, 11D, 11E, 11F: First cutting section

[0044] 111: Inner surface

[0045] 112B, 112C, 112D: Weakened structures

[0046] 12, 12A, 12C, 12E, 12F: Second cutting section

[0047] 13, 13A, 13F: Exit point

[0048] 14, 14C, 14E: Slides

[0049] 141: Slide rail

[0050] 142: Slide positioning part

[0051] 151E: First abutment structure

[0052] 152E: Second abutment structure

[0053] 20, 20A, 20C, 20E, 20F: Blades

[0054] 201, 201A, 201C: Regulator

[0055] 30, 30A, 30C, 30E, 30F: Operation buttons

[0056] 301: Operation button positioning part

[0057] 302: Hook

[0058] 31, 31F: Protrusion

[0059] 311, 311A, 311E, 311F: Sheath structure

[0060] 312, 312A, 312E, 312F: Shield structure

[0061] 313E, 313F: Claw section

[0062] 314F: Support structure

[0063] 40, 40A, 40C, 40F: Knife holder

[0064] P: Cutting path Detailed Implementation

[0065] To provide a detailed understanding of the technical features and practical effects of the present invention, and to enable its implementation according to the description, the preferred embodiments shown in the accompanying drawings are further described in detail below:

[0066] This invention relates to a cutting tool, with a preferred embodiment being a utility knife. A first preferred embodiment of this invention is, for example... Figures 1 to 4 As shown, the device includes a handle body 10, a blade 20, and an operating button 30. The handle body 10 has a blade receiving space 101 inside. The front end of the handle body 10 has a first blade extension part 11 and a second blade extension part 12 located on opposite sides, and a blade extension opening 13 is formed between the first blade extension part 11 and the second blade extension part 12. The blade extension opening 13 is connected to the blade receiving space 101.

[0067] Please see Figures 2 to 5The blade 20 can extend and retract along a cutting path P between the cutting opening 13 and the blade receiving space 101. The blade 20 can extend out of the cutting opening 13 of the handle body 10. Figure 3 As shown, it is in an extended position, and can also retract into the extended opening 13. Figure 5 The image shows a retracted blade state.

[0068] Please refer to the following: Figures 2 to 5 The operating button 30 is attached to the handle body 10 and is located on the same side of the handle body 10 as the first blade extension part 11. The operating button 30 can be used as follows: Figure 4 A locking position as shown and a Figure 3 The movement is between the indicated unlocking positions. Specifically, in the first preferred embodiment of the present invention, the handle body 10 is provided with a slide groove 14, the slide groove 14 is located close to the first blade extension part 11, and the operation button 30 is slidably engaged in the slide groove 14, and the two ends of the slide groove 14 correspond to the locked position and the unlocked position of the operation button 30, respectively.

[0069] like Figure 4 and Figure 5 As shown, the operation button 30 includes a body and a protrusion 31. The body is the portion of the operation button 30 located between the two ends of the slide groove 14. The protrusion 31 extends from the front end of the body toward the blade outlet 13 and is provided with a blade-stopping structure 311 and a blade-blocking structure 312. When the operation button 30 is in the locked position, please refer to [the documentation / reference needed]. Figure 5 The protruding portion 31 extends between the first blade exit portion 11 and the second blade exit portion 12, and the protruding portion 31 interferes with the blade exit path P. Further details are as follows... Figure 3 As shown, when the operation button 30 is in the unlocked position, the blade 20 can extend and retract normally; as Figure 4 As shown, when the blade 20 is in the extended state and the operation button 30 is in the locked position, the blade 20 is restricted by the abutment structure 311 and cannot swing toward the first extension part 11 or the second extension part 12, and the blade 20 can extend and retract relative to the abutment structure 311; on the other hand, as Figure 5 As shown, when the blade 20 is in the retracted state and the operation button 30 is in the locked position, the blade stop structure 312 is located on the blade exit path P. Under this condition, the blade 20 cannot push the protrusion 31 open and extend out of the blade exit 13, thereby keeping the blade 20 in the retracted state.

[0070] like Figure 4As shown, when the blade-stopping structure 311 of the protrusion 31 of the operation button 30 presses against the blade 20, the operation button 30 is in the locked position. The protrusion 31 interferes with the blade path P. Although the part of the blade 20 that extends out of the blade opening 13 and the part that is restricted by the blade-stopping structure 311 cannot swing toward the first blade opening 11 or the second blade opening 12 due to the action of the blade-stopping structure 311, that is, the blade 20 can present a working state without arbitrarily shaking, however, since the blade-stopping structure 311 does not completely suppress and lock the blade 20, and the first blade opening 11 and the protrusion 31 are elastic, the blade 20 can still freely extend and retract when the operation button 30 is in the locked position in the blade-out state. This allows the user to adjust the extension length of the blade 20 or retract the blade 20 into the handle body 10 during the use of the knife.

[0071] like Figure 5 As shown, when the operation button 30 is in the locked position, once the blade 20 returns to the retracted state, the protrusion 31 blocks the blade path P, so that when the blade 20 is pushed out along the blade path P, it will be blocked by the blade-blocking structure 312 of the protrusion 31, thus maintaining the retracted state.

[0072] Through the aforementioned technical features, the knife of the first preferred embodiment of the present invention, when the operation button 30 is in the locked position and the blade 20 is in the extended state, the blade 20 is restrained by the blade-stopping structure 311 and will not wobble arbitrarily, which is beneficial for users to perform high-precision cutting operations. Furthermore, the user does not need to adjust the position of the operation button 30 beforehand; they can adjust the extension or shortening of the blade 20 according to the usage situation or needs, making the knife of the present invention easy to operate. When the operation button 30 is in the locked position and the blade 20 is in the retracted state, the blade-stopping structure 312 of the operation button 30 can prevent the blade 20 from extending, thus preventing accidental blade extension and injury to personnel or objects when the user is carrying the knife. Therefore, the present invention effectively improves the problem that existing knives cannot simultaneously achieve blade stability during use, ease of operation, and safety when not in use, thereby providing a better knife.

[0073] In the first preferred embodiment of the present invention, such as Figures 2 to 5As shown, the protrusion 31 of the operation button 30 is an integrally formed component. In short, the blade-stopping structure 311 and the blade-guarding structure 312 are different parts of an integrally formed component. The blade-stopping structure 311 is located at the bottom of the protrusion 31 and close to the second blade extension 12, while the blade-guarding structure 312 is located on the side of the blade-stopping structure 311, away from the blade extension opening 13 and close to the main body of the operation button 30. Therefore, the structure of the operation button 30 is relatively simple, easy to manufacture and produce, and achieves the aforementioned effects of balancing blade stability (blade stabilization function) during use, ease of operation, and safety when not in use (blade-guarding function).

[0074] Specifically, in the first preferred embodiment of the present invention, such as Figures 1 to 4 As shown, the knife includes a blade holder 40, which is inserted into the handle body 10. The blade holder 40 is adjacent to and close to the second blade extension 12. The blade holder 40 is located in the blade receiving space 101 of the handle body 10, and the blade 20 is attached to the blade holder 40. The first blade extension 11 is elastic, and the total thickness of the blade 20, the blade-stopping structure 311 of the operating button 30, and the blade holder 40 is not less than the distance between the narrowest point of the first blade extension 11 and the second blade extension 12.

[0075] Therefore, when the blade 20 is in the extended state and the operating button 30 is in the locked position, if the blade 20 is subjected to force and deforms towards the first extension part 11 or the second extension part 12, the total thickness of the blade 20, the blade-stopping structure 311 of the operating button 30, and the blade holder 40 will increase. This will cause the first extension part 11 to be pushed outward and elastically deformed. At this time, the elastic restoring force of the first extension part 11 will increase the force pressing against the blade 20, thus preventing the blade 20 from swinging towards the first extension part 11 or the second extension part 12 and allowing it to sway arbitrarily. Furthermore, if Figure 4 As shown, when the total thickness of the blade 20, the blade-stopping structure 311 of the operating button 30, and the blade holder 40 is greater than the narrowest distance between the first blade extension 11 and the second blade extension 12, when the blade 20 is in the extended state and the operating button 30 is in the locked position, the elastic restoring force of the first blade extension 11 forces the protrusion 31 of the operating button 30 to press against the blade 20, making the blade 20 less prone to shaking.

[0076] For further information, please refer to [link / reference]. Figure 3When the operating button 30 is in the unlocked position, the protrusion 31 is spaced apart from the inner surface 111 of the first blade extension part 11, and the protrusion 31 is elastic and can swing against the inner surface 111 of the first blade extension part 11 under force, allowing the blade 20 to pass between the protrusion 31 and the second blade extension part 12. In this way, when the operating button 30 is in the unlocked position, it does not need to be completely withdrawn from the blade extension path P of the blade 20. Even with slight interference, when the blade 20 encounters the protrusion 31 during its extension process, the protrusion 31 swings to allow the blade 20 to extend from the extension opening 13 and assume the extended blade state. Because the operating button 30 does not need to be completely withdrawn from the extension path P, the knife can maintain a compact internal structure with no unnecessary or wasted space, and the handle body 10 can therefore have a smaller volume, making it convenient for the user to hold and carry the knife.

[0077] Furthermore, such as Figures 2 to 5 As shown, the slide groove 14 is provided with at least two slide rails 141. The operating button 30 is engaged in the slide groove 14 and abuts against the top side of the slide rail 141. Therefore, when the operating button 30 moves from the unlocked position to the locked position, as... Figure 3 and Figure 4 As shown, the operating button 30 moves abutting against the slide rail 141, causing the protrusion 31 to move towards the blade outlet 13. Conversely, when the operating button 30 moves from the locked position to the unlocked position, it moves abutting against the slide rail 141, causing the protrusion 31 to move away from the blade outlet 13, i.e., towards the body of the operating button 30. Furthermore, in the first preferred embodiment of the present invention, the slide rail 141 is inclined towards the blade outlet 13. Therefore, when the operating button 30 moves from the unlocked position to the locked position, the protrusion 31 simultaneously moves towards both the blade outlet 13 and the second blade outlet 12, thereby entering the blade outlet path P of the blade 20 and producing a blade stabilizing or blocking function.

[0078] Please refer to the following: Figure 1 The handle body 10 has a side surface 102, which is located between the first blade extension part 11 and the second blade extension part 12 on the surface of the handle body 10. The knife is provided with an adjuster 201, which is slidably disposed on the side surface 102 and extends into the handle body 10 to engage with the blade 20, thereby driving the blade 20 to extend and retract relative to the handle body 10. The engagement method of the adjuster 201 with the blade 20 and the engagement method of the adjuster 201 with the handle body 10 are existing technologies. The first preferred embodiment of the present invention only illustrates that the above-mentioned technical features of the operation button 30 can be applied to this kind of knife.

[0079] Please refer to the following: Figure 2 In the first preferred embodiment of the present invention, the inner circumferential surface of the slide groove 14 of the knife handle body 10 is provided with two slide groove positioning portions 142, and the outer circumferential surface of the operation button 30 is provided with an operation button positioning portion 301. When the operation button 30 is in the locked position and the unlocked position, the operation button positioning portion 301 is respectively located in one of the slide groove positioning portions 142, making the position switching state of the operation button 30 clearer, allowing the user to clearly understand whether the operation button 30 is in the locked position or the unlocked position, thereby improving operability and providing feedback. In the first preferred embodiment of the present invention, the slide groove positioning portion 142 is a groove, and the operation button positioning portion 301 is a flange, thus forming a concave-convex fit; the slide groove positioning portion 142 and the operation button positioning portion 301 can be other structures, as long as they are structures that can cooperate with each other when the operation button 30 is in the locked position and the unlocked position, the function can be achieved.

[0080] In addition, such as Figure 2 and Figure 3 As shown, the operation button 30 includes multiple hooks 302, which are respectively located on both sides of the operation button 30. When the operation button 30 is engaged with the slide groove 14, it extends into and engages with the inside of the knife handle body 10, preventing the operation button 30 from falling out.

[0081] Please see Figures 6 to 9 The differences between the second preferred embodiment and the first preferred embodiment of the present invention are as follows: First, in the second preferred embodiment of the present invention, as... Figure 6 As shown, the adjuster 201A and the operating button 30A are located on the same surface of the handle body 10A and the first blade extension part 11A. The adjuster 201A is closer to the rear end of the handle body 10A than the operating button 30A, and can adjust the extension length of the blade 20A. The operating button 30A is closer to the first blade extension part 11A, so that the distance between the blade-stopping structure 311A ​​and the blade-blocking structure 312A and the body of the operating button 30A is shorter. During the process of the operating button 30A moving to the locked position, it can move more accurately to the position to perform the blade stabilization and blade-blocking functions, thus helping to perform the blade stabilization and blade-blocking functions on the blade 20A.

[0082] Secondly, please refer to Figure 8 and Figure 9The blade-stopping structure 311A ​​and the blade-blocking structure 312A extend from the bottom of the operating button 30A toward the blade outlet 13A at intervals, so that the blade-stopping structure 311A ​​and the blade-blocking structure 312A can be separated from each other and can operate independently. When the operating button 30A is in the locked position, the blade-blocking structure 312A can elastically deform to change its position relative to the blade-stopping structure 311A. Specifically, the abutment structure 311A ​​and the stop structure 312A are arranged adjacent to each other on the left and right at the exit opening 13A. In this way, when manufacturing the tool, different structures can be formed on different parts on the left and right sides of the inner side of the first exit part 11A. When the operation button 30A is moved to the locked position, and the abutment structure 311A ​​and the stop structure 312A are inserted into the exit opening 13A, the abutment structure 311A ​​and the stop structure 312A abut against the different structures on the inner side of the first exit part 11A. This allows the stop structure 312A to elastically deform and change its position relative to the abutment structure 311A. The tool stabilization function and the tool stop function can be controlled separately, and the quality of tool stabilization and tool stop is improved by separation deformation.

[0083] Furthermore, in a specific implementation, in the second preferred embodiment of the present invention, the elasticity of the blade-blocking structure 312A is higher than that of the blade-stopping structure 311A, allowing the blade-stopping structure 311A ​​to exert a good blade-stopping effect and preventing it from being easily pushed away by the blade 20A, thus preventing the blade 20A from shaking. Conversely, the blade-blocking structure 312A, which has relatively high elasticity, can deform well between the blade 20A's extended and retracted states, so that the blade-blocking structure 312A does not affect the use of the blade 20A in the extended state, and when the blade 20A is in the retracted state, it will be blocked by the blade-blocking structure 312A when it is about to extend again.

[0084] In the second preferred embodiment of the present invention, the operation button 30A is a one-piece molded structure. Therefore, the materials of the abutment structure 311A ​​and the stop structure 312A have no difference in elasticity. Only the abutment structure 311A ​​and the stop structure 312A are respectively convex arm-shaped, and the connection portion between the stop structure 312A and the body of the operation button 30A is elongated. Therefore, the elasticity of the stop structure 312A is higher than that of the abutment structure 311A. In other possible embodiments, the technical feature that the elasticity of the stop structure 312A is higher than that of the abutment structure 311A ​​can be achieved through changes in structure and materials.

[0085] Please see Figure 10 and Figure 11The third preferred embodiment of the present invention is largely the same as the second preferred embodiment, with the main difference being that: the handle body 10B is provided with at least one weakening structure 112B, the weakening structure 112B being adjacent to the first blade extension portion 11B, allowing the first blade extension portion 11B to elastically deform relative to the weakening structure 112B. In the third preferred embodiment of the present invention, as... Figure 11 As shown, the knife handle body 10B includes two weakening structures 112B, respectively located on both sides of the first blade extension portion 11B. Each weakening structure 112B is a notch formed at the front end of the knife handle body 10B, penetrating both the inner and outer surfaces. Through the weakening structure 112B, the connection between the first blade extension portion 11B and other parts of the knife handle body 10B is reduced, making it easier for the first blade extension portion 11B to deform relative to other parts of the knife handle body 10B, such as the two weakening structures 112B, thereby improving the elasticity of the first blade extension portion 11B. Based on the same principle, the weakening structure 112B can be a groove or recess formed on the inner or outer surface of the knife handle body 10B, or multiple through holes located on both sides of the first blade extension portion 11B on the knife handle body 10B.

[0086] In other possible implementations, the number and position of the weakening structures 112B can also be varied, as long as the structural strength is reduced to improve the elasticity of the first cutting section 11B. In addition, to improve the elastic deformation capability of the first cutting section 11B, the method described in the fourth preferred embodiment of the present invention can also be adopted, as further explained below.

[0087] Please see Figures 12 to 15 The fourth preferred embodiment of the present invention discloses a knife with another shape and larger size, which differs from the previous embodiments in that: the first blade extension portion 11C extends forward from the front end of the handle body 10C; the slide groove 14C extends to the first blade extension portion 11C, and a portion of the operating button 30C is located on the first blade extension portion 11C; the adjuster 201C is also located on the same surface of the handle body 10C as the operating button 30C, and is used to extend and retract the blade 20C relative to the blade holder 40C; the blade holder 40C protrudes from the second blade extension portion 12C, and the portion of the blade holder 40C protruding from the second blade extension portion 12C mates with the first blade extension portion 11C, and is slightly longer than the first blade extension portion 11C. Please refer to further... Figure 15As shown, because the side structure of the knife handle body 10C located between the first blade extension portion 11C and the second blade extension portion 12C is eliminated, a weakened structure 112C is formed by the indentation of the blade extension opening (formed between the first blade extension portion 11C and the second blade extension portion 12C). This weakens the structural strength of the front end of the knife handle body 10C, making the first blade extension portion 11C more easily deformed elastically relative to other parts of the knife handle body 10C. The protruding portion of the operating button 30C is located at a position corresponding to the weakened structure 112C. In addition to providing the weakened structure, a technical solution is also provided to improve the elasticity of the first blade extension portion 11C, making it easier to deform, thereby improving the knife stabilization effect as mentioned above. Furthermore, by adjusting the thickness of the first blade extension portion 11C, the elasticity of the first blade extension portion 11C can also be changed, thereby adjusting the force pressing the blade 20C.

[0088] Please see Figure 16 The difference between the fifth preferred embodiment and the fourth preferred embodiment of the present invention is that the handle body 10D is further provided with two weakening structures 112D, which are located on both sides of the first blade extension portion 11D. By combining the relatively long first blade extension portion 11D with the weakening structures 112D on both sides of the first blade extension portion 11D, the elasticity of the first blade extension portion 11D is further improved.

[0089] Please see Figure 17A and Figure 17BThe sixth preferred embodiment of the present invention differs from the aforementioned preferred embodiments in that: the blade-stopping structure 312E and the blade-stopping structure 311E of the operation button 30E are also arranged adjacent to each other on the left and right, and the operation button 30E is also an integrally formed structure. The blade-stopping structure 312E has a hook portion 313E, and when the blade 20E is in the retracted state and the operation button 30E is in the locked position, the hook portion 313E is located on the blade-exit path, so that the blade 20E can abut against the hook portion 313E when moving along the blade-exit path. Through the technical feature of the hook portion 313E, the operation button 30E can provide a preferred blade-stopping effect when in the locked position, keeping the blade 20E in the retracted state. In the sixth preferred embodiment of the present invention, the handle body 10E includes a first abutting structure 151E and a second abutting structure 152E. The first abutting structure 151E protrudes from the first blade extension portion 11E toward the slide groove 14E. When the operating button 30E moves to the locked position, the blade-blocking structure 312E abuts against the first abutting structure 151E and deforms in the direction of the second blade extension portion 12E (downward), thereby using the claw portion 313E to provide a blade-blocking effect. The second abutting structure 152E protrudes inside the handle body 10E and is located below the blade-blocking structure 312E. When the operating button 30E moves to the unlocked position, the bottom of the arm-shaped portion of the blade-blocking structure 312E abuts against the second abutting structure 152E and swings upward, causing the claw portion 313E to exit the blade extension path.

[0090] Please see Figures 18 to 20 The difference between the seventh preferred embodiment of the present invention and the aforementioned preferred embodiments is that the protrusion 31F of the operation button 30F is a combined structure, and the abutment structure 311F and the stop structure 312F of the protrusion 31F are made of different materials and are combined in a combined manner. Therefore, when the operation button 30F is in the locked position, the stop structure 312F can elastically deform to change its position relative to the abutment structure 311F. Furthermore, the protrusion 31F includes a support structure 314F, the support structure 314F, the blade-stopping structure 311F, and the main body of the operation button 30F are integrally formed and connected; the blade-stopping structure 312F is a separate piece assembled on the support structure 314F, and the blade-stopping structure 312F is hook-shaped and has the hook portion 313F, so that when the blade 20F is in the retracted state and the operation button 30F is in the locked position, the hook portion 313F is located on the blade-out path, so that when the blade 20F moves along the blade-out path, it can abut against the hook portion 313F and be blocked by the hook portion 313F and maintained in the retracted state.

[0091] For further information, please refer to [link / reference]. Figure 21 and Figure 22The inner surface 111F of the first blade-exiting part 11F is inclined and has a supporting part 113F. When the operating button 30F is in the locked position, the blade-blocking structure 312F is abutted by the supporting part 113F of the inner surface 111F and elastically deforms towards the blade-exiting path, and is located on the blade-exiting path. Specifically, in the seventh preferred embodiment of the present invention, as Figures 20 to 22 As shown, the top of the blade-blocking structure 312F partially protrudes beyond other parts of the protrusion 31F, and this protruding part abuts against the inclined inner side surface 111F of the first blade-exiting part 11F. The abutting part is the abutting part 113F. In other possible embodiments, the top of the blade-blocking structure 312F does not need to protrude, and the inner side surface 111F can be formed into a special shape to abut against the blade-blocking structure 312F, causing the blade-blocking structure 312F to elastically deform relative to the blade-abutting structure 311F.

[0092] The detailed operation steps of the seventh preferred embodiment of the present invention are as follows: Figure 20 and Figure 21 As shown, when the operation button 30F moves from the unlocked position to the locked position, the protrusion 31F enters the blade outlet 13F, positioned between the first blade outlet 11F and the second blade outlet 12F. At this time, the blade 20F is in the extended state. The blade-stopping structure 311F is restricted by the first blade outlet 11F and presses against the blade 20F, thereby achieving a blade-stabilizing effect. At this time, the blade-blocking structure 312F abuts against the abutment part 113F and elastically deforms towards the blade outlet path. Only the blade 20F is in the extended state. Therefore, the claw part 313F of the blade-blocking structure 312F contacts the upper surface of the blade 20F and elastically deforms to press against the blade 20F.

[0093] The abutment structure 311F is formed at the bottom of the protrusion 31F, as shown in... Figure 21 When the blade 20F is in the extended position and the operation button 30F is in the locked position, the contact area between the blade 20F and the abutment structure 311F (the area where the bottom of the protrusion 31F contacts the blade 20F, surface contact) is greater than the contact area between the blade 20F and the stop structure 312F (the area where the claw 313F presses against the blade 20F, close to line contact), which can ensure a better blade stabilization effect.

[0094] The second to sixth preferred embodiments of the present invention all possess the technical feature that the contact area between the blade 20F and the abutment structure 311F is greater than the contact area between the blade 20F and the stop structure 312F, thereby improving the technical effect to be achieved by the present invention.

[0095] Please see Figure 21 and Figure 22When the blade 20F changes from the extended state to the retracted state, after the blade 20F retracts into the hook portion 313F of the stop structure 312F, the hook portion 313F will extend into the extension path due to elastic restoring force. If the user wants to push the blade 20F out again, the blade 20F will be pressed against by the hook portion 313F and maintained in the retracted state. The user must switch the operation button 30F to the unlocked position to extend the blade again. In the sixth preferred embodiment of the present invention, the hook portion 313E can also press against the blade 20E in an elastic deformation manner as described in this embodiment, and elastically reset after the blade 20E is withdrawn, thus acting as a stop.

[0096] Preferably, existing utility knife blades have a beveled edge at the tip. This invention further utilizes this structural feature to achieve a good blade-stopping effect, as explained below. Please refer to [further details omitted]. Figure 23 As shown, the blade 20F has a beveled edge 21F near the blade outlet 13F. The two opposite sides of the beveled edge 21F are the forward-protruding cutting edge side and the rearward-protruding back side of the blade 20F, respectively. The blade-stopping structure 311F and the blade-blocking structure 312F are arranged adjacent to each other on the left and right, respectively. The blade-blocking structure 312F is located on the cutting edge side corresponding to the beveled edge 21F. Therefore, when the user pushes out the blade 20F, because the cutting edge side of the beveled edge 21F protrudes forward and is closer to the blade outlet 13F, the beveled edge 21F will first abut against the hook portion 313F of the blade-blocking structure 312F to block the blade. The relative positions of the blade-stopping structure and the blade-blocking structure in the second to sixth preferred embodiments of the present invention also have the same technical feature corresponding to the shape of the blade.

[0097] Preferably, the guard structure 312F is made of a material with a creep rate lower than that of the abutment structure 311F. Because materials subjected to long-term, repeated elastic deformation may experience creep, meaning they may undergo localized permanent deformation and fail to elastically return to their original state. This could cause the tool-stabilizing or guarding functions of the operating button 30F to malfunction. Since the guard structure 312F requires high elastic deformation capacity to fulfill its function in this invention, using a material with a creep rate lower than that of the abutment structure 311F can reduce the risk of product failure. For example, to ensure mass production, in the seventh preferred embodiment of this invention, the body of the operating button 30F, the abutment structure 311F, and the support structure 314F are integrally formed from plastic material, while the guard structure 312F is integrally formed from a metal sheet to create the hook portion 313F, and then the guard structure 312F is attached to the support structure 314F. In this way, thanks to the good elasticity of the metal material, the creep problem of the guard structure 312F is low, which can improve the stability of the tool stabilization function and the guard function of the tool of the present invention, as well as increase the service life.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present invention without departing from the scope of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A cutting tool, characterized in that, Including: A knife handle body has a blade receiving space inside. The front end of the knife handle body has a first blade extension part and a second blade extension part located on opposite sides, and a blade extension opening is formed between the first blade extension part and the second blade extension part. The blade extension opening is connected to the blade receiving space. A blade, capable of moving back and forth along a cutting path between a cutting opening and a blade receiving space, the blade extending out of the cutting opening of the handle body in a cutting-out state, and retracting into the cutting opening in a retracted state; and An operating button is attached to the handle body and is located on the same side of the handle body as the first blade extension part. The operating button can move between a locked position and an unlocked position. The operating button includes a protrusion with a blade-stopping structure and a blade-blocking structure. When the operating button is in the locked position, the protrusion interferes with the blade extension path, and the blade-blocking structure can elastically deform to change its position relative to the blade-stopping structure. Specifically, when the blade is in the extended state and the operation button is in the locked position, the blade is restricted by the abutment structure and cannot swing toward the first or second extended part, and the blade can extend and retract relative to the abutment structure; when the blade is in the retracted state and the operation button is in the locked position, the abutment structure is located on the extended path, thereby maintaining the blade in the retracted state.

2. The cutting tool as described in claim 1, characterized in that, The knife includes a blade holder that passes through the handle body and is adjacent to the second blade extension. The blade holder is located in the blade receiving space, and the blade is attached to the blade holder. The first blade extension is elastic, and the total thickness of the blade, the blade-stopping structure of the operating button, and the blade holder is not less than the narrowest distance between the first blade extension and the second blade extension, so that when the blade is in the extended state and the operating button is in the locked position, the blade cannot swing toward the first blade extension or the second blade extension.

3. The cutting tool as described in claim 2, characterized in that, The handle body is provided with at least one weakening structure, which is adjacent to the first blade extension part, so that the first blade extension part can elastically deform relative to the weakening structure.

4. The cutting tool as described in claim 1, characterized in that, The elasticity of the guard structure is higher than that of the counter-blade structure.

5. The cutting tool as described in claim 4, characterized in that, The blade-stopping structure and the blade-blocking structure extend from the bottom of the operating button toward the blade outlet at intervals.

6. The cutting tool as described in claim 4, characterized in that, The protrusion includes a support structure, which is integrally formed and connected with the blade-stopping structure, and the blade-stopping structure is combined with the support structure.

7. The cutting tool as described in claim 6, characterized in that, The guard structure is made of a material with a creep rate lower than that of the guard structure.

8. The cutting tool as described in any one of claims 5 to 7, characterized in that, The blade stop structure has a hook portion, and when the blade is in the retracted state and the operation button is in the locked position, the hook portion is located on the blade delivery path, so that the blade can abut against the hook portion when it moves along the blade delivery path.

9. The cutting tool as described in any one of claims 5 to 7, characterized in that, The handle body includes a stop portion formed inside the handle body. When the operating button moves from the unlock position to the locked position, the knife-stopping structure is abutted by the stop portion and elastically deforms towards the knife-out path.

10. The cutting tool as described in any one of claims 5 to 7, characterized in that, When the blade is in the extended state and the operation button is in the locked position, the contact area between the blade and the abutment structure is greater than the contact area between the blade and the stop structure.

11. The cutting tool as described in any one of claims 1 to 7, characterized in that, When the operating button is in the unlocked position, the protrusion is spaced apart from the inner surface of the first blade extension, and the protrusion can be swung towards the inner surface of the first blade extension, allowing the blade to pass between the protrusion and the second blade extension.

12. The cutting tool as described in claim 11, characterized in that, The handle body includes a slide groove with at least two slide rails. The operating button is slidably engaged in the slide groove, and the two ends of the slide groove correspond to the locked position and the unlocked position of the operating button. When the operating button moves from the unlocked position to the locked position, the operating button moves against at least one of the slide rails, causing the protrusion to move in the direction of the blade opening.

13. The cutting tool as described in any one of claims 1 to 7, characterized in that, The first blade extension part has an inclined inner side. When the operating button is in the locked position, the blade blocking structure is elastically deformed by the inner side and is located on the blade extension path.

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