A safety utility knife with automatic retraction function

Abstract

This utility model relates to the field of utility knife technology and discloses a safety utility knife with an automatic retraction function. It includes a handle, a blade inserted into one end of the handle, a spring-loaded component at one end of the blade, and a movable plate fixedly connected to one end of the blade. First insert plates are fixedly connected to both ends of the movable plate, and a slide rail is fitted onto the outer side of the first insert plate away from the movable plate. The slide rail is fixedly connected to the handle at the end away from the first insert plate, and a first spring is fixedly connected to the end of the movable plate away from the blade. A connecting plate is fixedly connected to the end of the first spring away from the movable plate, and a fixing component is provided at the end of the connecting plate away from the first spring. A locking component is provided at the end of the handle away from the spring-loaded component, and a pushing component is provided at the upper end of the movable plate. Through the cooperation of the spring-loaded component and the fixing component, the blade retraction structure is simple, easy to assemble and disassemble, thus facilitating subsequent maintenance and replacement and effectively improving ease of use.

Description

Technical Field

[0001] This utility model relates to the field of utility knife technology, specifically to a safety utility knife with an automatic retraction function. Background Technology

[0002] A utility knife consists of a plastic handle and a blade. It has a pull-out design, although some have metal handles. The blade is usually beveled with segmented slits that allow it to automatically cut off pieces as they wear out, creating new blades.

[0003] A search revealed Chinese patent application CN202120144741.2, which proposes a dual-function utility knife, relating to the field of knife technology. The knife knife includes an outer frame, a blade holder, and a blade. The blade holder and the outer frame are connected by a first elastic element. A first sliding element and a second sliding element are slidably mounted on the outer frame. The first sliding element is connected to the blade holder and can extend or retract the blade. The second sliding element is connected to a second elastic element. The inner wall of the outer frame has multiple positioning grooves, the depth of which gradually increases in the direction away from the inlet and outlet. This prior art provides two states for the user to choose from: in the first state, operating the first sliding element extends the blade, and the blade automatically retracts under the action of the first elastic element; in the second state, operating the second sliding element positions the blade in multiple positions on the outer frame. This dual-function utility knife is not only simple in structure and complete in function, but also avoids the safety hazards and reduced blade life caused by the blade not being retracted.

[0004] In the aforementioned prior art, the automatic retraction function of the blade is achieved by using the elastic potential energy of a spring to pull the blade back to its original position. Although this automatic retraction method is relatively convenient, the spring mechanism is usually fixedly installed inside the handle. Furthermore, the structure inside the handle in the aforementioned prior art is relatively complex, making it difficult to quickly disassemble and repair or replace the damaged part after the internal structure is damaged, which makes the use of the utility knife inconvenient. Utility Model Content

[0005] The purpose of this utility model is to provide a safety utility knife with an automatic retraction function, which solves the problem that existing safety utility knives with automatic retraction functions are inconvenient to use because their internal structure is relatively complex and the internal retraction mechanism is generally fixed or bolted, making it difficult to quickly disassemble, replace, and repair damaged parts.

[0006] This utility model provides the following technical solution: a safety utility knife with automatic retraction function, including a handle, a blade inserted inside one end of the handle, a spring-loaded component at one end of the blade, and the spring-loaded component including a movable plate fixedly connected to one end of the blade, a first insert plate fixedly connected to both ends of the movable plate, and a slide rail sleeved on the outer side of the end of the first insert plate away from the movable plate, the end of the slide rail away from the first insert plate fixedly connected to the handle, and a first spring fixedly connected to the end of the movable plate away from the blade, a connecting plate fixedly connected to the end of the first spring away from the movable plate, and a fixing component provided at the end of the connecting plate away from the first spring, a locking component provided at the end of the handle away from the spring-loaded component, a pushing component provided at the upper end of the movable plate, a pressing component provided at one end of the pushing component, and a limiting component provided at the end of the pushing component away from the pressing component, and both ends of the movable plate having arc-shaped chamfers.

[0007] The above technical solution utilizes the elastic potential energy of the first spring to pull the moving plate back to its original position.

[0008] As a preferred embodiment of the above technical solution, the fixing component includes a first threaded rod rotatably connected to the end of the connecting plate away from the first spring, and a screw plate is fixedly connected to the end of the first threaded rod away from the connecting plate.

[0009] As a preferred embodiment of the above technical solution, the locking assembly includes a locking pin inserted inside the end of the blade holder near the blade, with the lower end of the locking pin fixedly connected to the blade holder, and a second spring fixedly connected to the upper end of the locking pin, with the upper end of the second spring inserted inside the movable plate.

[0010] The above technical solution uses a locking pin inserted into the moving plate to restrict the position of the moving plate.

[0011] As a preferred embodiment of the above technical solution, the pushing component includes a push plate fixedly connected to the upper end of the movable plate, and a clamping plate fixedly connected to the end of the push plate near the blade, the lower end of the clamping plate being in contact with the blade.

[0012] The above technical solution uses a locking plate to restrict the position of one end of the moving plate.

[0013] As a preferred embodiment of the above technical solution, the push plate is fixedly connected to two ends of a second insert plate, and the end of the second insert plate away from the push plate is inserted into the tool holder.

[0014] As a preferred embodiment of the above technical solution, the pressing assembly includes a pressing plate inserted inside the push plate near the blade end, and a third spring is fixedly connected to the upper and lower sides of the pressing plate, with the lower end of the third spring fixedly connected to the push plate.

[0015] The above technical solution utilizes the movement of the pressing plate to squeeze the locking pin inserted into the moving plate, thereby pushing the locking pin out of the moving plate.

[0016] As a preferred embodiment of the above technical solution, the limiting component includes a screw ring disposed on the upper side of the push plate away from the pressing plate, and a second threaded rod is fixedly connected to the lower end of the screw ring. The outer side of the second threaded rod is threadedly engaged in the push plate, and a positioning rod is fixedly connected to the lower end of the second threaded rod. The outer side of the positioning rod is inserted into the moving plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This safety utility knife features an automatic retraction function. Through the cooperation of spring-loaded and fixing components, the blade retraction structure is simple, easy to assemble and disassemble, thus facilitating subsequent maintenance and replacement and effectively improving ease of use. Attached Figure Description

[0019] Figure 1 A three-dimensional structural diagram of a safety utility knife with an automatic retraction function;

[0020] Figure 2 A first-person view cross-sectional diagram of a safety utility knife with automatic retraction function;

[0021] Figure 3 A second-view cross-sectional structural diagram of a safety utility knife with automatic retraction function;

[0022] Figure 4 A schematic diagram of the inner structure of the handle of a safety utility knife with an automatic retraction function;

[0023] Figure 5 This is a third-view cross-sectional diagram of a safety utility knife with an automatic retraction function.

[0024] In the diagram: 1. Handle; 11. Blade; 2. Springback assembly; 21. Moving plate; 22. First insert plate; 23. Slide rail; 24. First spring; 25. Connecting plate; 3. Fixing assembly; 31. First threaded rod; 32. Tightening plate; 4. Locking assembly; 41. Locking post; 42. Second spring; 5. Pushing assembly; 51. Push plate; 52. Locking plate; 53. Second insert plate; 6. Pressing assembly; 61. Pressing plate; 62. Third spring; 7. Restricting assembly; 71. Tightening ring; 72. Second threaded rod; 73. Positioning rod. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] like Figures 1-5As shown, this utility model provides a technical solution: a safety utility knife with an automatic retraction function, including a handle 1, a blade 11 inserted inside one end of the handle 1, a spring-loaded assembly 2 at one end of the blade 11, and the spring-loaded assembly 2 including a movable plate 21 fixedly connected to one end of the blade 11, first insert plates 22 fixedly connected to both ends of the movable plate 21, and a slide rail 23 sleeved on the outer side of the end of the first insert plate 22 away from the movable plate 21, the end of the slide rail 23 away from the first insert plate 22 fixedly connected to the handle 1, and a first spring 24 fixedly connected to the end of the movable plate 21 away from the blade 11. One end of the moving plate 21 is fixedly connected to the connecting plate 25, and the end of the connecting plate 25 away from the first spring 24 is provided with a fixing component 3. The end of the blade holder 1 away from the spring-back component 2 is provided with a locking component 4, and the upper end of the moving plate 21 is provided with a pushing component 5. One end of the pushing component 5 is provided with a pressing component 6, and the end of the pushing component 5 away from the pressing component 6 is provided with a limiting component 7. Both ends of the moving plate 21 are provided with arc-shaped chamfers. Through the cooperation of the spring-back component 2 and the fixing component 3, the retraction structure of the blade 11 is simple, easy to assemble and disassemble, thus facilitating subsequent maintenance and replacement, and effectively improving the convenience of use.

[0027] like Figure 2 As shown, the fixing component 3 includes a first threaded rod 31 rotatably connected to the end of the connecting plate 25 away from the first spring 24, and a screw plate 32 is fixedly connected to the end of the first threaded rod 31 away from the connecting plate 25. Tightening the screw plate 32 drives the first threaded rod 31 to rotate, and the first threaded rod 31 is used to lock and restrict the connecting plate 25 by engaging with the thread of the tool holder 1.

[0028] like Figure 2 As shown, the locking assembly 4 includes a locking post 41 inserted inside the end of the handle 1 near the blade 11, and the lower end of the locking post 41 is fixedly connected to the handle 1. The upper end of the locking post 41 is fixedly connected to a second spring 42, and the upper end of the second spring 42 is inserted into the moving plate 21. The elastic potential energy of the second spring 42 pushes the locking post 41 out, thereby allowing the locking post 41 to be inserted into the moving plate 21 for locking and restriction.

[0029] like Figure 2 As shown, the pushing component 5 includes a push plate 51 fixedly connected to the upper end of the moving plate 21, and a clamping plate 52 fixedly connected to the end of the push plate 51 near the blade 11. The lower end of the clamping plate 52 is in contact with the blade 11. Pushing the push plate 51 can drive the moving plate 21 to move through the clamping plate 52 and the positioning rod 73.

[0030] like Figure 3 As shown, the push plate 51 has a second insert plate 53 fixedly connected to both ends, and the end of the second insert plate 53 away from the push plate 51 is inserted into the tool holder 1. When the push plate 51 moves, it drives the second insert plate 53 to move under the restriction of the tool holder 1.

[0031] like Figure 2 As shown, the pressing assembly 6 includes a pressing plate 61 inserted inside the push plate 51 near the blade 11, and a third spring 62 is fixedly connected to the lower side of the upper end of the pressing plate 61. The lower end of the third spring 62 is fixedly connected to the push plate 51. Pressing the pressing plate 61 can compress the third spring 62, thereby allowing the pressing plate 61 to be inserted into the moving plate 21 to squeeze the locking post 41.

[0032] like Figure 2 As shown, the limiting component 7 includes a screw ring 71 disposed on the upper side of the push plate 51 away from the pressing plate 61, and a second threaded rod 72 is fixedly connected to the lower end of the screw ring 71. The outer thread of the second threaded rod 72 is engaged with the push plate 51, and a positioning rod 73 is fixedly connected to the lower end of the second threaded rod 72. The outer side of the positioning rod 73 is inserted into the moving plate 21. Tightening the screw ring 71 can drive the second threaded rod 72 and the positioning rod 73 to rotate. By means of the thread engagement between the second threaded rod 72 and the push plate 51, the second threaded rod 72 moves to push the positioning rod 73 into the moving plate 21 for secondary locking and limiting.

[0033] Working principle: When the blade 11 is damaged and needs to be replaced, first turn the screw ring 71 to drive the second threaded rod 72 and the positioning rod 73 to rotate. This allows the positioning rod 73 to be pulled out of the moving plate 21 by the thread engagement between the second threaded rod 72 and the push plate 51. Then, turn the screw plate 32 to drive the first threaded rod 31 to unscrew the tool holder 1. At this time, the pressing plate 61 can be pressed. After the pressing plate 61 is pressed, the third spring 62 is compressed and moves downward. After the pressing plate 61 moves downward, it can push the locking pin 41 inserted into the moving plate 21. When the locking pin 41 is pushed out of the moving plate 21, at this time, pull the screw plate 32 while releasing the pressing plate 61. The screw plate 32 can then be used to move the moving plate 21. 21 and the blade 11 are pulled out of the tool holder 1 for replacement. During subsequent installation, the moving plate 21, with the assistance of the first insert plate 22, first inserts the blade 11 into the slide rail 23 in the tool holder 1. As the moving plate 21 is inserted, when it reaches the locking post 41, the moving plate 21 presses against the locking post 41, causing it to be inserted into the tool holder 1 and compressing the second spring 42. The moving plate 21 continues to be inserted. After the connecting plate 25 is inserted into the tool holder 1, the screwing plate 32 can be turned to rotate the first threaded rod 31, allowing the first threaded rod 31 to engage with the thread of the tool holder 1 and be screwed into the tool holder 1 for installation. One end of the movable plate 21 is locked by the push plate 51. Then, the screw ring 71 can be turned to rotate the second threaded rod 72 and the positioning rod 73, allowing the positioning rod 73 to be inserted into the movable plate 21 to lock it. In subsequent use, the pressing plate 61 is pressed to compress the third spring 62 and then moves downwards. After the pressing plate 61 moves downwards, it is inserted into the movable plate 21, pressing the locking post 41. After the locking post 41 is pushed out of the movable plate 21, the push plate 51 can be pushed to move the movable plate 21 through the locking plate 52 and the positioning rod 73, stretching the first spring 24. The movable plate 21 moves with the assistance of the first insert plate 22 and the slide rail 23. When the movable plate 21... When the device moves to another set of locking pins 41, the moving plate 21 presses the other set of locking pins 41 to insert them into the handle 1. When the moving plate 21 moves to the designated position, the other set of locking pins 41 that were pressed out is ejected by the elastic potential energy of the second spring 42, so that the locking pins 41 are inserted into the moving plate 21 to lock the moving plate 21. The blade 11 can then be used to cut the item. After use, press the pressing plate 61 again to push the locking pins 41 out of the moving plate 21. At this time, the elastic potential energy of the first spring 24 pulls the moving plate 21 back to its original position. After returning to its original position, the locking pins 41 lock the moving plate 21 again.

[0034] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A safety utility knife with an automatic retraction function, comprising a handle (1), wherein a blade (11) is inserted inside one end of the handle (1), characterized in that: One end of the blade (11) is provided with a spring-loaded assembly (2), and the spring-loaded assembly (2) includes a movable plate (21) fixedly connected to one end of the blade (11). The movable plate (21) has two fixedly connected first insert plates (22), and a slide rail (23) is sleeved on the outer side of the first insert plate (22) away from the movable plate (21). The slide rail (23) is fixedly connected to the handle (1) at the end away from the first insert plate (22), and a first spring (24) is fixedly connected to the end of the movable plate (21) away from the blade (11). 24) A connecting plate (25) is fixedly connected to the end away from the moving plate (21), and a fixing component (3) is provided at the end of the connecting plate (25) away from the first spring (24). A locking component (4) is provided at the end of the knife handle (1) away from the spring-back component (2), and a pushing component (5) is provided at the upper end of the moving plate (21). A pressing component (6) is provided at one end of the pushing component (5), and a limiting component (7) is provided at the end of the pushing component (5) away from the pressing component (6). Both ends of the moving plate (21) have arc-shaped chamfers.

2. A safety utility knife with automatic retraction function according to claim 1, characterized in that: The fixing component (3) includes a first threaded rod (31) rotatably connected to the end of the connecting plate (25) away from the first spring (24), and a screw plate (32) is fixedly connected to the end of the first threaded rod (31) away from the connecting plate (25).

3. A safety utility knife with automatic retraction function according to claim 1, characterized in that: The locking assembly (4) includes a locking post (41) inserted inside the end of the handle (1) near the blade (11), and the lower end of the locking post (41) is fixedly connected to the handle (1). The upper end of the locking post (41) is fixedly connected to a second spring (42), and the upper end of the second spring (42) is inserted into the moving plate (21).

4. A safety utility knife with automatic retraction function according to claim 1, characterized in that: The pushing component (5) includes a push plate (51) fixedly connected to the upper end of the moving plate (21), and a clamping plate (52) is fixedly connected to one end of the push plate (51) near the blade (11), with the lower end of the clamping plate (52) in contact with the blade (11).

5. A safety utility knife with automatic retraction function according to claim 4, characterized in that: The push plate (51) has a second insert plate (53) fixedly connected to both ends, and the end of the second insert plate (53) away from the push plate (51) is inserted into the handle (1).

6. A safety utility knife with automatic retraction function according to claim 1, characterized in that: The pressing assembly (6) includes a pressing plate (61) inserted inside the push plate (51) near the blade (11), and a third spring (62) is fixedly connected to the lower side of the upper end of the pressing plate (61), and the lower end of the third spring (62) is fixedly connected to the push plate (51).

7. A safety utility knife with automatic retraction function according to claim 1, characterized in that: The limiting component (7) includes a screw ring (71) disposed on the upper side of the push plate (51) away from the pressing plate (61), and a second threaded rod (72) is fixedly connected to the lower end of the screw ring (71). The outer side of the second threaded rod (72) is threadedly engaged in the push plate (51), and a positioning rod (73) is fixedly connected to the lower end of the second threaded rod (72). The outer side of the positioning rod (73) is inserted into the moving plate (21).

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