A retractable utility knife

Abstract

The utility model provides a storable art knife, including knife shell, the knife shell includes upper knife shell and lower knife shell, and is equipped with the accommodation cavity between upper knife shell and lower knife shell, slide rail is arranged in the inner surface of upper knife shell or / and lower knife shell, the front end of blade support spare is detachably fixed with blade, characterized by: the accommodation sliding cavity is arranged between the front of upper knife shell and lower knife shell, and the front and back sliding of blade support spare is supplied, push twist seat is set up in the top of rear end of blade support spare, push twist subassembly is installed on push twist seat, it includes push twist, and both sides of push twist are equipped with push piece, and correspondingly, both sides of push twist seat are equipped with push seat, push piece and push seat mutually cooperate, and drive blade support spare to move back and forth, slide groove hole is distributed on upper knife shell along the length direction, and push twist slides, and, in the inner side of slide groove hole, front and back distribution has the stop slot with push piece of push twist and carries out the positioning locking cooperation, and the blade is telescopic locking in the knife shell, not only simple structure, and the blade installation replacement is convenient.

Description

Technical Field

[0001] This utility model relates to the field of utility knives, and more particularly to a retractable utility knife. Background Technology

[0002] Utility knives on the market today feature various locking and retractable mechanisms, with the sliding mechanism being the most classic and basic locking technology. Its core is a slider controlled by the thumb, which engages with a slot at the end of the blade. Pushing the slider forward extends and locks the blade in place, providing the basic stability needed for cutting; sliding it backward allows the blade to retract safely. The biggest advantage of this mechanism is its extreme ease of operation, low cost, and ability to achieve quick one-handed operation. However, its reliance on lateral locking force is limited, and its stability may be insufficient for high-intensity or precision work. It remains the preferred solution for mainstream products.

[0003] Upon investigation, patent number CN202220001853.7 discloses a utility knife with a locking and blade-changing mechanism, comprising a blade base and a blade cover. A blade holder is mounted on the blade base, and a blade, a push button, and a push gate are installed on the blade holder. The blade and the blade holder are connected by a spring. A tension spring is between the blade holder and the blade base, and a top spring is between the push gate and the blade holder. The push gate has a push gate fixing post that slides within a first track groove and a second track groove on the blade base. The second track groove has a push gate fixing groove. A blade change button is connected to the blade cover. The blade change button is linked to a spring, and the spring has a blade insertion block that engages with the blade. Pressing the blade change button disengages the blade from the spring, allowing for blade replacement. However, the mechanism of this product can still be optimized. Summary of the Invention

[0004] This utility model addresses the problems of existing technology by proposing a retractable utility knife with a retractable and lockable blade inside the blade case. It is not only simple in structure but also convenient for blade installation and replacement.

[0005] The technical solution of this utility model is: a retractable utility knife, comprising:

[0006] A blade casing includes an upper blade casing and a lower blade casing, with a storage cavity provided between the upper and lower blade casings;

[0007] A slide rail is provided on the inner surface of the upper and / or lower cutter housings;

[0008] A blade support component with a detachable blade fixed at the front end;

[0009] Its features are:

[0010] A sliding cavity is provided at the front between the upper and lower blade housings, allowing the blade support to slide back and forth.

[0011] A push-to-torsion seat is located at the top of the rear end of the blade support;

[0012] A push-torque assembly is installed on a push-torque seat. It includes a push-torque, push plates on both sides of the push-torque, and corresponding push seats on both sides of the push-torque seat. The push plates and push seats cooperate with each other to drive the blade support to move back and forth.

[0013] A sliding groove is distributed along the length of the upper blade housing for the pusher to slide. Furthermore, on the inner side of the sliding groove, there are stop grooves arranged in sequence to position and lock the pusher plate of the pusher to engage with the pusher.

[0014] Furthermore, the push-twist seat has a protrusion in the middle, and an elastic element is fixed in the protrusion. The other end of the elastic element abuts against the bottom of the push-twist assembly, applying an outward pushing force.

[0015] Furthermore, the sliding cavity is preferably T-shaped, and the corresponding blade support is also T-shaped. The left and right ends of the sliding cavity have a limiting function to prevent the blade support from sliding excessively.

[0016] Furthermore, the blade support has a U-shaped push groove on one side of its front end and a limiting block on the other side. Correspondingly, the blade is pushed in from the push groove side, and the other end of the blade contacts the limiting block to prevent the blade from being pushed out, thereby realizing the blade installation.

[0017] Furthermore, the slide hole has three stop slots arranged in front and behind, and the push plates on both sides of the corresponding push knob match each other to realize the functions of changing blades, positioning and locking, and storage respectively.

[0018] Furthermore, the push knob has a fixing part at its center top, and a contact piece is fixed on the fixing part. The top of the contact piece has a wavy texture to facilitate contact with the user's fingers and increase friction.

[0019] Furthermore, the front part of the lower blade housing is a guide groove with an opening. The size of the guide groove matches the blade support, so that the blade support and the blade extend out of the blade housing in a directional manner.

[0020] Furthermore, the outer walls on both sides of the blade shell are provided with protective plate fixing cavities, in which protective plates are enclosed and fixed, making it convenient for users to hold.

[0021] Furthermore, the tail of the blade housing is provided with a fixed cavity that communicates with the insertion port at the tail end. A blade compartment is detachably inserted into the fixed cavity. The front of the blade compartment stores spare blades, and the rear of the blade compartment is provided with a fixed end cap that cooperates with the insertion port. The end of the fixed end cap has a pry plate.

[0022] Finally, the bottom of the blade compartment is provided with a flexible button, and the bottom of the corresponding lower blade housing is provided with a button hole. The flexible button is elastically inserted and fixed into the button hole.

[0023] Compared with the prior art, the technical advantages of this application are: the telescopic blade and the blade replacement structure are simple, and the blade can be stored. The blade housing is equipped with a blade compartment to store spare blades. It has rich functions, is easy for users to operate, prevents the blade from accidentally falling off, and the shape of the blade housing is more convenient for users to hold horizontally. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 This is a cross-sectional view of the present invention.

[0026] Figure 3 This is an exploded structural diagram of the blade support and push-torsion assembly.

[0027] Figure 4 This is a schematic diagram of a partial explosion structure of the present invention.

[0028] Figure 5 This is a schematic diagram of the overall exploded structure of this utility model.

[0029] Figure 6 This is a schematic diagram of the overall exploded structure of this utility model (from another angle).

[0030] In the diagram, 1. Blade housing, 2. Upper blade housing, 3. Lower blade housing, 4. Storage cavity, 5. Slide rail, 6. Blade support, 7. Blade, 8. Storage sliding cavity, 9. Push-torque seat, 10. Push-torque assembly, 11. Protrusion, 12. Elastic element, 13. Push-torque, 14. Push plate, 15. Push seat, 16. Limiting block, 17. Fixing part, 18. Contact plate.

[0031] 19. Gear slot; 20. Protector plate fixing cavity; 21. Protector plate; 22. Fixing cavity; 23. Blade compartment; 24. Spare blade; 25. Fixing end cap; 26. Pry bar; 27. Spring-loaded button; 28. Button hole; 29. ​​Pusher groove.

[0032] 30. Sliding hole; 31. Guide groove. Detailed Implementation

[0033] The embodiments of this utility model patent will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model patent, but should not be construed as limiting its scope. In the description of this utility model patent, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model patent. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model patent based on the specific circumstances.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 6 A retractable utility knife includes a blade shell 1, which has an upper blade shell 2 and a lower blade shell 3, forming a storage cavity 4 between the upper blade shell 2 and the lower blade shell 3; a slide rail 5 is disposed on the inner surface of the upper blade shell 2 and the lower blade shell 3; a blade 7 is detachably fixed to the front end of a blade support member 6; the improvement is that: a storage sliding cavity 8 is arranged at the front between the upper blade shell 2 and the lower blade shell 3, allowing the blade support member 6 to slide back and forth; a push-torsion seat 9 is disposed at the top of the rear end of the blade support member 6; The push-torque assembly 10 is mounted on the push-torque seat 9. It includes a push-torque 13, with push plates 14 on both sides of the push-torque 13. Correspondingly, push seats 15 are provided on both sides of the push-torque seat 9. The push plates 14 and push seats 15 cooperate with each other to drive the blade support 6 to move back and forth. In addition, there are sliding groove holes 30 distributed along the length direction on the upper blade housing 2 for the push-torque 13 to slide. Moreover, there are stop grooves 19 arranged in sequence on the inner side of the sliding groove holes 30 to lock with the push plates 14 of the push-torque 13.

[0037] The sliding cavity 8 is preferably T-shaped, and the corresponding blade support 6 is also T-shaped. The left and right ends of the sliding cavity 8 have limiting functions to prevent the blade support 6 from sliding excessively. One side of the front end of the blade support 6 is provided with a push groove 29 with a U-shaped opening, and the other side is provided with a limiting block 16. In this way, the blade 7 can be pushed in from the U-shaped opening side of the push groove 29, and the other end of the blade 7 contacts the limiting block 16 to prevent the blade 7 from being pushed out, thereby realizing the installation of the blade 7.

[0038] The push-twist seat 9 has a protrusion 11 in the middle, and an elastic element 12 is fixed in the protrusion 11. The other end of the elastic element 12 abuts against the bottom of the push-twist assembly 10, applying an outward pushing force. The corresponding sliding hole 30 preferably has three stop slots 19 on both sides from front to back, namely a blade changing stop, a positioning locking stop, and a blade storage stop. The corresponding push pieces 14 cooperate with each other to realize the functions of blade changing 7, positioning locking, and storage, respectively. The push-twist 13 has a fixing part 17 at its center top, and a contact piece 18 is fixed on the fixing part 17. The top of the contact piece 18 has a corrugated pattern to facilitate user finger contact and increase friction.

[0039] The front of the lower blade housing 3 has a guide groove 31 with an opening. The size of the guide groove 31 matches the blade support 6, allowing the blade support 6 and the blade 7 to extend out of the opening of the blade housing. The left and right outer walls of the blade housing 1 have protective plate fixing cavities 20, in which protective plates 21 are fixedly enclosed. The protective plates 21 typically have textured surfaces and are made of plastic to increase friction and facilitate gripping. The tail of the blade housing has a fixing cavity 22 that communicates with the insertion port at the tail end. A blade compartment 23 is detachably inserted into the fixing cavity 22. The front of the blade compartment 23 stores spare blades 24, and the rear of the blade compartment has a fixing end cap 25 that mates with the insertion port. The end of the fixing end cap 25 has a pry bar 26 for easy carrying and prying of objects.

[0040] The bottom of the blade compartment 23 is provided with a spring button 27, and the bottom of the corresponding lower blade housing 3 is provided with a button hole 28. The spring button 27 is always elastically inserted and fixed to the button hole 28. When the user presses the spring button 27, the blade compartment 23 is pulled out and a spare blade can be taken out for use.

[0041] When using this product, the user simply needs to press the push button 13 with their finger. The push plates 14 on both sides of the push button 13 slide out from the rearmost stop groove 19. Then, the user pushes the push button 13 along the slide hole 30, causing the push plates 14 to engage and lock with the middle stop groove 19, thus achieving the blade positioning and locking function. The user can then use the utility knife normally. When the user wants to change the blade, they continue to press the push button 13 and slide it forward, causing the push plates 14 to engage with the frontmost stop groove 19. 9 are interlocked and fixed in the blade changing position. At this time, the pusher groove 29 with U-shaped opening of the blade support 6 is fully exposed outside the blade housing. The blade 7 can be taken out from the pusher groove 29. Then press the elastic button 27 to pull out the blade chamber 23 and take out the spare blade 24 and push it into the pusher groove 29. This means that a new blade has been replaced. Then press the push knob 13 and slide it backward to let the push plate 14 into the last stop groove 19, which is in the blade storage position, thus realizing the storage function of the blade and its blade support.

Claims

1. A retractable utility knife, comprising: A blade casing includes an upper blade casing and a lower blade casing, with a storage cavity provided between the upper and lower blade casings; A slide rail is provided on the inner surface of the upper and / or lower cutter housings; A blade support component with a detachable blade fixed at the front end; Its features are: A sliding cavity is provided at the front between the upper and lower blade housings, allowing the blade support to slide back and forth. A push-to-torsion seat is located at the top of the rear end of the blade support; A push-torque assembly is installed on a push-torque seat. It includes a push-torque, push plates on both sides of the push-torque, and corresponding push seats on both sides of the push-torque seat. The push plates and push seats cooperate with each other to drive the blade support to move back and forth. A sliding groove is distributed along the length of the upper blade housing for the pusher to slide. Furthermore, on the inner side of the sliding groove, there are stop grooves arranged in sequence to position and lock the pusher plate of the pusher to engage with the pusher.

2. The retractable utility knife according to claim 1, characterized in that... The push-twist seat has a protrusion in the middle, and an elastic element is fixed in the protrusion. The other end of the elastic element abuts against the bottom of the push-twist assembly, applying an outward pushing force.

3. A retractable utility knife according to claim 1, characterized in that... The storage sliding cavity is preferably T-shaped, and the corresponding blade support is also T-shaped. The left and right ends of the storage sliding cavity have a limiting function to prevent the blade support from sliding excessively.

4. A retractable utility knife according to claim 1, characterized in that... The blade support has a U-shaped push groove on one side of its front end and a limiting block on the other side. Correspondingly, the blade is pushed in from the push groove side, and the other end of the blade contacts the limiting block to prevent the blade from being pushed out, thereby realizing the blade installation.

5. A retractable utility knife according to claim 1, characterized in that... The slide hole has three stop slots arranged in front and behind, and the push plates on both sides of the corresponding push knob match each other to realize the functions of changing blades, positioning and locking, and storage respectively.

6. A retractable utility knife according to claim 4, characterized in that... The push knob has a fixing part at its center top, and a contact piece is fixed on the fixing part. The top of the contact piece has a wavy texture to facilitate contact with the user's fingers and increase friction.

7. A retractable utility knife according to claim 1, characterized in that... The front part of the lower blade housing has an open guide groove. The size of the guide groove matches the blade support, so that the blade support and the blade extend out of the blade housing in a directional manner.

8. A retractable utility knife according to claim 1, characterized in that... The blade casing has protective plate fixing cavities on its left and right outer walls, and protective plates are fixed in the protective plate fixing cavities for easy grip by the user.

9. A retractable utility knife according to claim 1, characterized in that... The tail of the blade housing is provided with a fixed cavity that communicates with the insertion port at the tail end. A blade compartment is detachably inserted into the fixed cavity. The front of the blade compartment stores spare blades. The rear of the blade compartment is provided with a fixed end cap that cooperates with the insertion port. The end of the fixed end cap has a pry plate.

10. A retractable utility knife according to claim 9, characterized in that... The bottom of the blade compartment is provided with a flexible button, and the bottom of the corresponding lower blade housing is provided with a button hole. The flexible button is elastically inserted and fixed into the button hole.

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