Safety art knife

Abstract

The utility model relates to cutting tool technical field, concretely relates to a safe art knife, including handle, with handle rotatory connection's knife rest, in the card of spade bit in the knife rest and in the card of spade blade in the spade bit, spade bit rotatory connection in the knife rest, still be provided with the rotary assembly connected with the knife rest on the handle, the rotary assembly includes rotary nut, rotary button, button spring, and rotary nut will rotatory connection of knife rest and handle, still be provided with the limit block on the knife rest, still be provided with the limit slot on the handle, when spade bit and the knife rest rotate and change position, drive limit protrusion and limit slot joint or separate joint, corresponding the handle lower edge still set up has the cutting edge mouth of accommodating limit protrusion rotation. A safe art knife of the utility model can limit the knife rest and handle when spade bit mode, prevent causing injury, switch to art knife mode and automatically release the limit, can be stored and folded and carry conveniently.

Description

Technical Field

[0001] This utility model relates to the field of cutting tools, specifically to a safety utility knife. Background Technology

[0002] In existing technology, utility knives and scrapers are usually used separately. Utility knives are used to cut softer objects, while scrapers are used to scrape off unwanted materials such as stickers and advertising paper on flat surfaces. It is inconvenient to carry both knives at the same time, and there is a risk of injury and safety during the switching process.

[0003] Chinese Patent CN218342171U discloses a utility knife, including a handle, a blade holder, a blade head, a blade, and a steering and positioning device. The steering and positioning device includes a steering positioning member with a positioning protrusion and a limiting protrusion, and a first spring with one end on the blade holder and the other end on the steering positioning member. A first positioning groove and a second positioning groove are formed on the blade head. When the blade edge is parallel to the positioning protrusion, the positioning protrusion is engaged in the first groove, and the limiting protrusion is on the outside of the blade edge. When the steering positioning member is pushed to compress the first spring, the positioning protrusion moves away from the first groove, rotating the blade head so that the blade head rotates until the positioning protrusion is engaged in the second groove. This utility model combines the functions of a utility knife and a scraper, offers stable and reliable operation, is foldable, and has an anti-accidental injury structure.

[0004] In this patent, the knife holder can be rotated into the handle cavity by pressing the rotation button in either utility knife or scraper mode to fold the knife holder. There is no safety locking structure. In actual use, the utility knife mode can be directly folded and stored, but in scraper mode, the blades extend outward on both sides, making it impossible to fully store them into the handle cavity. The exposed blades can easily cause accidental injury. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the background technology mentioned above, and to provide a safe utility knife that can limit the knife holder and handle in the scraper mode to prevent accidental injury, and automatically release the limit when switching to utility knife mode, so that it can be stored, folded and carried for easy carrying.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a safety utility knife, comprising a handle, a knife holder rotatably connected to the handle, a scraper head locked within the knife holder, and a scraper blade locked within the scraper head. The scraper head is rotatably connected within the knife holder and is limited and locked by the knife holder. The handle is also provided with a rotating assembly connected to the knife holder. The rotating assembly includes a rotating nut, a rotating button, and a button spring. The rotating nut rotatably connects the knife holder and the handle. A longitudinal limiting groove is provided on the outer circumference of the rotating button. A limiting sleeve for accommodating the rotating button is provided on the lower side of the handle at a corresponding position. The inner sliding connection rotary button has two ends of the button spring connected to the bottom of the limiting sleeve and the lower end face of the rotary button, respectively. When the rotary button is not pressed, the limiting slot is located on the upper part of the tool holder, and the rotary button is engaged with the tool holder to prevent the tool holder from rotating. When the rotary button is pressed, the limiting slot moves downward and disengages from the tool holder to allow the tool holder to rotate. The tool holder is provided with a limiting block, and the tool handle is also provided with a limiting groove that engages with the limiting hole. When the scraper head rotates and changes position with the tool holder, it drives the limiting protrusion to engage or disengage with the limiting groove. The corresponding lower edge of the tool handle is also provided with a cutting edge to accommodate the rotation of the limiting protrusion.

[0007] Furthermore, the scraper head includes a scraper cover, a spring, a scraper change button, and a scraper holder. The scraper cover has a slot to accommodate the scraper change button and the spring, and the slot corresponds to the shape of the scraper change button. The scraper change button is rotatably connected inside the scraper cover. The spring is located between the scraper change button and the scraper cover. The scraper change button is also provided with a limiting protrusion that engages with the opening of the scraper blade. The outer surfaces of the scraper cover and the scraper holder are also provided with corresponding rotating protrusions. The top surface of the scraper cover is also provided with a first engaging groove and a second engaging groove that engage with the blade holder. The first engaging groove and the second engaging groove are vertically distributed on the upper and right sides of the scraper cover with the rotating protrusion as the center. The distance from the bottom of the second engaging groove to the rotating protrusion is less than the distance from the bottom of the first engaging groove to the rotating protrusion, so that the displacement is different when the blade holder engages with the scraper head. The scraper holder is fastened to the scraper cover by screws.

[0008] Furthermore, the scraper head includes a scraper cover, a scraper holder, and a cylindrical protrusion inside the scraper cover to accommodate the scraper blade. A rotating protrusion is also provided on the outer surface of the scraper holder. A hollow sleeve is installed at a corresponding position on the outer surface of the scraper cover. The outer wall of the hollow sleeve is rotatably connected to the scraper cover, and the inner wall is threaded. A handle is screwed onto the upper part of the hollow sleeve. Rotating the handle to bring it close to the scraper holder presses the scraper blade together; rotating it in the opposite direction to move the handle away from the scraper holder releases the scraper blade. For easy replacement of the scraper blade; the top surface of the scraper cover is also provided with a first locking groove and a second locking groove for engaging with the blade holder. The first locking groove and the second locking groove are vertically distributed on the upper and right sides of the scraper cover with the hollow sleeve as the center. The distance from the bottom of the second locking groove to the hollow sleeve is less than the distance from the bottom of the first locking groove to the hollow sleeve, so that the displacement is different when the blade holder engages with the scraper head. The scraper blade holder is fastened to the scraper cover by screws and is rotatably connected to the blade holder by rotating protrusions and hollow sleeves.

[0009] Furthermore, the blade holder includes a rotating blade base, a return spring, a safety lock, and a rotating blade cover. The rotating blade base has a long groove in the middle for placing the spring. Guide strips that slide and connect with the bottom surface of the safety lock are arranged parallel to the upper and lower sides of the long groove. The tail of the rotating blade base is also provided with a limiting toothed ring that engages with the rotating button. The bottom of the safety lock engages with the guide strip, and the tail is connected to the return spring. The rotating blade cover has an opening at the top, which exposes the upper part of the safety lock when connected to the rotating blade base screw. The head of the safety lock is also provided with a limiting post that engages with the blade head, and a limiting block is fixedly connected to the tail of the upper part.

[0010] Furthermore, the knife handle includes a blade base, a knife-holding groove, a knife case cover, a blade cover, and a belt buckle. The knife-holding groove is fastened to the inner top surface of the blade base by bolts and is used to hold spare shovel blades. The blade base and the front of the blade cover are rotatably connected to the knife holder and the rotating assembly. The knife case cover is rotatably connected to the top of the blade base and the blade cover and is used to close and cover the knife-holding groove. The belt buckle is fastened to the blade cover by screws.

[0011] Furthermore, a limiting groove is provided at the center of the front end of the inner side of the blade cover, dividing the edge of the blade cover into upper and lower parts. The upper edge of the blade cover is tightly fastened to the bottom of the blade, and the lower edge is opened with a cutting edge. When connected to the bottom of the blade, the gap between the cutting edge and the bottom of the blade is greater than the height of the limiting block, so that the limiting block can rotate downward along the cutting edge after it is disengaged from the limiting groove, without interfering with the blade cover.

[0012] Furthermore, the blade head is also provided with a rotating toggle, which is divided into two parts and fixedly attached to the blade holder and blade cover.

[0013] Furthermore, the blade change button consists of a rotating part and a blade-locking part. The rotating part is square, with a blade head extending outward from the upper end, and rotating shafts that are rotatably connected to the slot on both sides of the lower end. The blade-locking part is fixedly connected to the lower end of the rotating part, and a cylindrical protrusion for limiting the blade is provided on its outer surface. The limiting protrusion is fixed to the lower end of the blade-locking part and is located directly above the slot. A spring is installed in an arch shape directly below the limiting protrusion. When the rotating part is turned, the blade-locking part is driven to squeeze the spring, and the limiting protrusion moves towards the spring, causing the blade to disengage from the limiting protrusion, so that the blade can be removed for blade change.

[0014] Furthermore, the blade holder is also provided with a stop bar on its side. The height of the stop bar is the same as that of the cylindrical protrusion, and it is located on both sides close to the cylindrical protrusion.

[0015] The beneficial effects of this utility model are: 1) This utility model is equipped with a rotating component, which is connected to the knife holder by rotating the button. The limit can only be released after pressing the rotating button. At the same time, the knife holder is also equipped with a limit block that engages with the knife handle. The corresponding knife handle is equipped with a limit groove to accommodate the limit block. When the knife is switched from utility knife mode to scraper mode, the displacement of the knife holder drives the limit hole to move towards the limit groove, so that it switches from a non-interference state to a snap-fit ​​state. At this time, pressing the rotating button will not rotate the knife holder, which can prevent accidental injury caused by folding the scraper head in scraper mode.

[0016] 2) A tool change button and a spring are set up. The tool change button is connected to the scraper cover by rotation and is engaged with the scraper blade. The rotation drives the limiting protrusion engaged with the scraper blade to retract inward, so that the scraper blade is disengaged from the tool change button to complete the tool change. The spring stores force when it retracts so as to reset the tool change button to complete the tool locking. The tool change process is simpler and more convenient.

[0017] 3) A hollow sleeve and a handle are provided. The hollow sleeve connects the blade cover and the blade holder. The handle is screwed into the hollow sleeve. Rotating the handle adjusts the distance between the blade and the blade holder at the end of the handle, which can tighten or loosen the blade. The blade replacement structure is simpler and more convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is an exploded view of the present invention.

[0020] Figure 3 This is a schematic diagram of the blade cover in this utility model.

[0021] Figure 4 for Figure 1 A magnified view of a portion of the image.

[0022] Figure 5 This is an exploded view of the tool holder in this utility model.

[0023] Figure 6 This is an exploded view of the rotating component in this utility model.

[0024] Figure 7 This is a top view of the shovel head in this utility model.

[0025] Figure 8 This is an exploded view of the shovel head in Example 1.

[0026] Figure 9 This is a schematic diagram of the tool change button connection in Example 1.

[0027] Figure 10 This is an exploded view of the shovel head in Example 2.

[0028] Figure 11 The connection position of the handle in Embodiment 2 Figure 1 .

[0029] Figure 12 The connection position of the handle in Embodiment 2 Figure 2 .

[0030] Figure 13 This is an exploded view of the shovel head in Example 3.

[0031] In the diagram: 1. Knife handle; 2. Knife holder; 3. Shovel head; 4. Shovel blade; 5. Rotating assembly; 5-1. Rotating nut; 5-2. Rotating button; 5-3. Button spring; 5-21. Limiting slot; 5-22. Limiting sleeve; 6. Limiting block; 7. Limiting groove; 8. Cutting edge; 10. Shovel cover; 11. Spring; 12. Knife change button; 13. Shovel holder; 14. Groove; 15. Limiting protrusion; 16. Rotating protrusion; 17. First locking groove; 8. Second locking slot; 19. Hollow sleeve; 19-1 handle; 20. Rotating blade base; 21. Return spring; 22. Safety lock; 23. Rotating blade cover; 24. Long groove; 25. Guide bar; 26. Limiting toothed ring; 27. Limiting post; 30. Blade body base; 31. Blade locking groove; 32. Blade box cover; 33. Blade body cover; 34. Belt buckle; 40. Turning angle; 41. Rotating part; 42. Blade locking part; 43. Rotating shaft; 44. Cylindrical protrusion; 45. Stop bar. Detailed Implementation

[0032] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1: As Figure 1-6As shown, the present invention discloses a safety utility knife, comprising a handle 1, a knife holder 2 rotatably connected to the handle 1, a scraper head 3 locked within the knife holder 2, and a scraper blade 4 locked within the scraper head 3. The scraper head 3 is rotatably connected within the knife holder 2 and is limited and locked by the knife holder 2. The handle 1 is also provided with a rotating assembly 5 connected to the knife holder 2. The rotating assembly 5 includes a rotating nut 5-1, a rotating button 5-2, and a button spring 5-3. The rotating nut 5-1 rotatably connects the knife holder 2 and the handle 1. The rotating button 5-2 has a longitudinal limiting groove 5-21 on its outer circumference. A limiting sleeve 5-22 for accommodating the rotating button 5-2 is provided on the lower side of the handle 1 at the corresponding position. A rotating button 5-22 is slidably connected within the limiting sleeve 5-22. The rotary button 5-2 and the button spring 5-3 are respectively connected at both ends to the bottom of the limiting sleeve 5-22 and the lower end face of the rotary button 5-2. When the rotary button 5-2 is not pressed, the limiting groove 5-21 is located on the upper part of the tool holder 2, and the rotary button 5-2 is engaged with the tool holder 2 to prevent the tool holder 2 from rotating. When the rotary button 5-2 is pressed, the limiting groove 5-21 moves downward and disengages from the tool holder 2 to allow the tool holder 2 to rotate. The tool holder 2 is provided with a limiting block 6, and the tool handle 1 is also provided with a limiting groove 7 that engages with the limiting hole. When the scraper head 3 rotates and changes position with the tool holder 2, it drives the limiting protrusion 15 to engage or disengage from the limiting groove 7. The lower edge of the corresponding tool handle 1 is also provided with a cutting edge 8 to accommodate the rotation of the limiting protrusion 15. refer to Figure 7 and Figure 8 The scraper head 3 includes a scraper cover 10, a spring 11, a scraper change button 12, and a scraper holder 13. The scraper cover 10 has a slot 14 inside to accommodate the scraper change button 12 and the spring 11. The slot 14 corresponds to the shape of the scraper change button 12. The scraper change button 12 is rotatably connected inside the scraper cover 10. The spring 11 is located between the scraper change button 12 and the scraper cover 10. The scraper change button 12 also has a limiting protrusion 15 that engages with the opening of the scraper blade 4. The outer surfaces of the scraper cover 10 and the scraper holder 13 are also provided with… The top surface of the scraper cover 10 is also provided with a first engaging groove 17 and a second engaging groove 18 that engage with the blade holder 2, corresponding to the rotating protrusion 16. The first engaging groove 17 and the second engaging groove 18 are vertically distributed on the upper and right sides of the scraper cover 10 with the rotating protrusion 16 as the center. The distance from the bottom of the second engaging groove 18 to the rotating protrusion 16 is less than the distance from the bottom of the first engaging groove 17 to the rotating protrusion 16, so that the displacement of the blade holder 2 and the scraper head 3 is different when they engage. The scraper base 13 is fastened to the scraper cover 10 by screws. The scraper head 3 is also provided with a turning angle 40 for easy rotation. The turning angle 40 is divided into two parts and fixedly fixed to the scraper base 13 and the scraper cover 10.

[0034] refer to Figure 9The blade change button 12 consists of a rotating part 41 and a blade-locking part 42. The rotating part 41 is square, with the blade head 3 extending outward from the upper end. The lower end has rotating shafts 43 that are rotatably connected to the slot 14 on both sides. The blade-locking part 42 is fixedly connected to the lower end of the rotating part 41. A cylindrical protrusion 44 for limiting the blade 4 is provided on its outer surface. The limiting protrusion 15 is fixed to the lower end of the blade-locking part 42 and is located directly above the slot 14. The spring piece 11 is arched and installed directly below the limiting protrusion 15. When the rotating part 41 is turned, the blade-locking part 42 is driven to squeeze the spring piece 11, and the limiting protrusion 15 moves towards the spring piece 11, so that the blade 4 is disengaged from the limiting protrusion 15, and the blade 4 can be removed for blade change.

[0035] refer to Figure 5 The blade holder 2 includes a rotating blade base 20, a return spring 21, a safety lock 22, and a rotating blade cover 23. The rotating blade base 20 has a long groove 24 in the middle for placing the spring. The upper and lower sides of the long groove 24 are parallel to the guide strips 25 that are slidably connected to the bottom surface of the safety lock 22. The tail of the rotating blade base 20 is also provided with a limiting tooth ring 26 that engages with the rotating button 5-2. The bottom of the safety lock 22 is engaged with the guide strip 25, and the tail is connected to the return spring 21. The rotating blade cover 23 has an opening at the top, so that the upper part of the safety lock 22 is exposed when it is screwed to the rotating blade base 20. The head of the safety lock 22 is also provided with a limiting post 27 that engages with the scraper head 3, and the upper tail is fixedly connected to a limiting block 6.

[0036] refer to Figure 1-3 The knife handle 1 includes a blade base 30, a knife-holding groove 31, a knife case cover 32, a blade cover 33, and a belt buckle 34. The knife-holding groove 31 is fastened to the inner top surface of the blade base 30 by bolts and is used to hold spare spatula blades 4. The blade base 30 and the blade cover 33 are rotatably connected to the front of the knife holder 2 and the rotating assembly 5. The knife case cover 32 is rotatably connected to the top of the blade base 30 and the blade cover 33 and is used to close and cover the knife-holding groove 31. The belt buckle 34 is screwed in. It is fastened to the blade cover 33; a limiting groove 7 is provided in the middle of the front end of the inner side of the blade cover 33, which divides the edge of the blade cover 33 into upper and lower parts. The upper edge of the blade cover 33 is tightly fastened to the blade bottom 30, and the lower edge is opened with a cutting edge 8. When connected to the blade bottom 30, the gap between the cutting edge 8 and the blade bottom 30 is greater than the height of the limiting block 6, so that the limiting block 6 can rotate downward along the cutting edge 8 after it is disengaged from the limiting groove 7, without interfering with the blade cover 33.

[0037] In this embodiment, the connection structure and working principle of the rotating component 5, the blade holder 2, and the blade handle 1 are described in detail in the background art documents. Compared with these, this embodiment also provides a limiting block 6 and a limiting groove 7, so that the limiting block 6 is not connected to the limiting groove 7 in the utility knife mode, thus not affecting the folding and storage action of the blade holder 2 and the blade handle 1. When switching to the shovel knife mode, since the first locking groove 17 is closer to the blade handle 1, the limiting block 6 after the switch moves towards the blade handle 1 until it reaches the limit. Block 6 engages with the limiting groove 7. At this time, after the rotating component 5 is unlocked, the safety lock 22 is still engaged with the handle 1, and the knife holder 2 cannot be folded into the handle 1. At the same time, since the limiting block 6 protrudes upward relative to the safety lock 22, when folding or unfolding in utility knife mode, the protruding limiting block 6 will interfere when passing the lower edge of the handle 1. Therefore, it is necessary to open a cutting edge 8 on the lower edge of the blade cover 33 to cut off a certain height so that the limiting block 6 can smoothly pass through the cutting edge 8 to rotate and complete the folding or unfolding.

[0038] Meanwhile, a new tool changing mechanism is also set up, which uses a tool changing button 12 in cooperation with a spring 11. The tool changing button 12 can rotate and move within the scraper cover 10. When it moves, it will squeeze the spring 11 to store force, so that when it is released, the spring 11 will drive the tool changing button 12 to reset. When rotating, the limiting protrusion 15 will move to the direction of the spring 11. The scraper blade 4 is engaged with the limiting protrusion 15 through the trapezoidal opening. When the tool changing button 12 moves, the limiting protrusion 15 is disengaged from the scraper blade 4. At this time, the scraper blade 4 can be removed and replaced with a new scraper blade 4. The opening is placed in the middle of the tool changing button 12. After releasing, the limiting protrusion 15 is engaged with the opening to complete the tool installation. In order to improve the tool installation effect, a cylindrical protrusion 44 is also provided on the tool changing button 12 for easy positioning. The surface of the cylindrical protrusion 44 is set as an inclined surface in the direction from the inside to the outside to improve the positioning effect.

[0039] Example 2: Figure 10-12As shown, the scraper head 3 includes a scraper cover 10 and a scraper holder 13. The scraper cover 10 has a cylindrical protrusion 44 for accommodating the scraper blade 4. The scraper holder 13 has a rotating protrusion 16 on its outer surface. A hollow sleeve 19 is installed at a corresponding position on the outer surface of the scraper cover 10. The outer wall of the hollow sleeve 19 is rotatably connected to the scraper cover 10, and its inner wall is threaded. A handle 19-1 is screwed onto the upper part of the hollow sleeve 19. Rotating the handle 19-1 brings it closer to the scraper holder 13, pressing the scraper blade 4. Rotating it in the opposite direction moves the handle 19-1 away from the scraper holder 13, releasing the scraper blade 4. Loosen to facilitate replacement of the scraper blade 4; the top surface of the scraper cover 10 is also provided with a first locking groove 17 and a second locking groove 18 that engage with the blade holder 2. The first locking groove 17 and the second locking groove 18 are vertically distributed on the upper and right sides of the scraper cover 10 with the hollow sleeve 19 as the center. The distance from the bottom of the second locking groove 18 to the hollow sleeve 19 is less than the distance from the bottom of the first locking groove 17 to the hollow sleeve 19, so that the displacement of the blade holder 2 and the scraper head 3 is different when they are engaged. The scraper holder 13 is fastened to the scraper cover 10 by screws and is rotatably connected to the blade holder 2 by rotating the protrusion 16 and the hollow sleeve 19.

[0040] The scraper head 3 in Embodiment 1 requires a slot inside the scraper cover 10 to install a tool change button 12 and a spring 11. The front also needs to have two locking slots in two directions. Its structure is complex, which is not conducive to processing, production, assembly and maintenance. Moreover, the ability to change and install the tool smoothly depends on the elastic deformation capability of the spring 11. After the spring 11 loses its elastic deformation, it cannot fix the scraper blade 4 for use, resulting in a short service life.

[0041] Therefore, the scraper head 3 is redesigned by eliminating the internal slot 14. The handle 19-1 is screwed to the hollow sleeve 19, so that the handle 19-1 can be rotated to screw and fix the internal scraper blade 4. Rotating the handle 19-1 in the opposite direction can loosen the scraper blade 4, making it easy to replace the scraper blade 4. Correspondingly, a through hole is also provided on the rotating blade cover 23 to accommodate the handle 19-1. After assembly, the handle 19-1 passes through the rotating blade cover 23 and the scraper cover 10 in sequence and is screwed to the hollow sleeve 19. Rotating the handle 19-1 moves the end of the handle 19-1 closer to or away from the scraper blade 4, thus fixing or loosening the scraper blade 4. The handle 19-1 is rotatably connected to the rotating blade cover 23. When the scraper head 3 and the blade holder 2 switch positions, the handle 19-1 always rotates in the direction of the scraper head 3, and the scraper blade 4 will not interfere with the handle 19-1 during use.

[0042] In utility knife mode, the handle 19-1 is positioned at the upper right corner to secure the scraper blade 4. When switching to scraper mode, the handle 19-1 is positioned at the lower right corner, meaning that when the scraper blade 4 is vertical, the handle 19-1 faces the lower right. With this fixed position, the handle 19-1 is located at the upper right corner above the knife holder 2, behind the scraper blade 4, without affecting grip. When switching to utility knife mode, the scraper blade 4 rotates 90 degrees clockwise, and correspondingly, the handle 19-1 rotates 90 degrees counterclockwise, positioning itself at the upper right corner above the knife holder 2. At the lower corner, always located behind the scraper blade 4, the handle 19-1 is always hidden within its projection surface in both modes. When the knife holder 2 is folded and stored from the utility knife mode, the handle 19-1, the scraper blade 4, and the knife holder 2 as a whole rotate 180 degrees counterclockwise along the rotating nut 5-1 into the handle 1. At this time, the handle 19-1 is in the lower left corner position, which is exactly at the lower opening of the handle 1. The extended end of the handle 19-1 fits against the body of the handle 1, making it convenient to carry and use. Its structure is simplified, the processing cost is low, and the knife replacement structure is sturdy and durable.

[0043] Example 3: Figure 13 As shown, based on implementation two, a stop bar 45 is also installed on the side of the shovel blade holder 13. The height of the stop bar is the same as that of the cylindrical protrusion 44, and it is located on both sides close to the cylindrical protrusion 44.

[0044] In the second implementation, the blade changing structure presses the scraper blade 4 from above through the end face of the handle 19-1. The cylindrical protrusion 44 positions the back of the scraper blade 4. When the handle 19-1 is rotated and pressure is applied, the rotational friction will drive the scraper blade 4 to move. This means that when tightening or loosening, it is necessary to hold the scraper blade 4 and apply a reverse torque in order to tighten or loosen the scraper blade 4 smoothly and keep the scraper blade 4 in a positive direction, that is, perpendicular or parallel to the handle 1 for convenient use.

[0045] Therefore, based on Embodiment 2, a stop bar 45 for limiting the blade 4 needs to be added to limit the two sides of the blade 4. It works in conjunction with the cylindrical protrusion 44 to achieve multiple limiting points. This makes it difficult for the blade 4 to move when rotating the handle 19-1, and makes it easier to position the blade 4 when installing it.

[0046] The working principle is as follows: 1. Utility knife mode - Shovel mode Switching actions: Push the safety lock 22 backward, compress the return spring 21, and disengage the limit post 27 from the second locking groove 18. Rotate the toggle angle 40 clockwise, and the scraper cover 10 rotates around the rotating protrusion 16, causing the upper first locking groove 17 to rotate to the front of the safety lock 22. After releasing, the return spring 21 drives the safety lock 22 to reset, causing the limit post 27 to engage with the first locking groove 17. At this time, the scraper cover 10 rotates 90 degrees, and the clamped scraper blade 4 rotates accordingly, rotating from a straight blade to a scraper blade.

[0047] Limit status: The bottom of the first locking slot 17 is farther from the rotation center, while the bottom of the second locking slot 18 is closer to the rotation center. When the safety lock 22 engages with the first locking slot 17, the safety lock 22 is farther from the rotation center and correspondingly closer to the tool holder 1. The upper end of the safety lock 22 is fixedly connected to the limiting block 6, and the corresponding tool holder 1 is provided with a limiting slot 7 to accommodate the limiting block 6. When the safety lock 22 engages with the second locking slot 18, the limiting block 6 at the end leaves a gap from the front of the tool holder 1 and does not interfere with the tool holder 1. At this time, pressing the rotation button 5-2 can fold the tool holder 2 counterclockwise and store it in the tool holder 1. When the safety lock 22 engages with the first locking slot 17, the safety lock 22 is closer to the tool holder 1, causing the tail limit block 6 to engage with the limit slot 7 inside the tool holder 1. At this time, if the rotation button 5-2 is pressed, the tool holder 2 and the limit block 6 will still be engaged and limited, and the tool holder 2 cannot be rotated counterclockwise into the tool holder 1.

[0048] Shovel mode - Utility knife mode Switching actions: Push the safety lock 22 backward to disengage it from the first locking slot 17, rotate the toggle angle 40 counterclockwise to engage the safety lock 22 with the second locking slot 18, and the scraper head 3 drives the scraper blade 4 to rotate 90 degrees, from the scraper blade to the straight blade.

[0049] Limit status: When the blade is in use, the limiting block 6 at the tail of the safety lock 22 engages with the limiting groove 7 inside the handle 1, and cannot be stored and folded by the rotating component 5. When switching to a straight blade, the limiting block 6 is farther away from the handle 1 and does not engage with the limiting groove 7, so it can be stored and folded by the rotating component 5.

[0050] Utility knife - folding Referring to the prior art documents, by pressing down the rotary button 5-2, the limit of the knife holder 2 and the knife handle 1 is contacted. In the utility knife mode, the tail of the safety lock 22 leaves a gap with the knife handle 1, so that the limit block 6 is not connected to the limit groove 7, and the knife holder 2 can be rotated counterclockwise. At the same time, the limit block 6 is protruding at the tail of the safety lock 22. When rotating, the protrusion will obstruct the lower part of the knife cover 33. Therefore, a cutting edge 8 is also provided on the knife cover 33 so that the limit block 6 can be smoothly rotated to fold through the cutting edge 8 when rotating. The height of the cutting edge 8 corresponds to the protrusion of the limit hole.

[0051] Folding utility knife Unlike the utility knife which is folded and stored, when unfolded, the knife holder 2 rotates clockwise to unfold. When the limiting block 6 passes under the handle 1, it rotates through the cutting edge 8. When the pressed-down rotating button 5-2 is released, the knife holder 2, the handle 1 and the rotating component 5 are locked in place.

[0052] This invention features a rotating component that engages with the blade holder via a rotating button. Pressing the rotating button releases the limiting mechanism. The blade holder also has a limiting block that engages with the blade handle, and the corresponding blade handle has a limiting groove to accommodate the limiting block. When switching from utility knife mode to scraper mode, the displacement of the blade holder moves the limiting hole towards the limiting groove, switching it from a non-interference state to a locked state. In this state, pressing the rotating button will not rotate the blade holder, preventing accidental injury from the folding scraper head in scraper mode. A blade change button and a spring are also included. The blade change button is connected to the blade cover by rotation, and simultaneously engages with the blade. Rotation causes the limiting protrusion engaged with the blade to retract inward, disengaging the blade from the blade change button and completing the blade change. The spring clip stores force during retraction to reset the blade change button and lock the blade, making the blade change process simpler and more convenient. A hollow sleeve and handle are provided. The hollow sleeve connects the blade cover and blade holder, and the handle is screwed into the hollow sleeve. Rotating the handle adjusts the distance between the blade and the blade holder at the end of the handle, allowing the blade to be tightened or loosened, making the blade change structure simpler and more convenient.

[0053] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A safety utility knife, characterized in that: The device includes a handle, a blade holder rotatably connected to the handle, a scraper head fitted inside the blade holder, and a scraper blade fitted inside the scraper head. The scraper head is rotatably connected inside the blade holder and is limited and locked by the blade holder. The handle also has a rotating assembly connected to the blade holder. The rotating assembly includes a rotating nut, a rotating button, and a button spring. The rotating nut rotatably connects the blade holder and the handle. The rotating button has a longitudinal limiting groove on its outer circumference. A limiting sleeve for accommodating the rotating button is provided on the lower side of the handle at a corresponding position. The rotating button is slidably connected inside the limiting sleeve. The button spring has two... The ends are respectively connected to the bottom of the limiting sleeve and the lower end face of the rotary button. When the rotary button is not pressed, the limiting slot is located on the upper part of the tool holder, and the rotary button is engaged with the tool holder to prevent the tool holder from rotating. When the rotary button is pressed, the limiting slot moves downward and disengages from the tool holder to allow the tool holder to rotate. The tool holder is provided with a limiting block, and the tool handle is also provided with a limiting groove that engages with the limiting hole. When the scraper head rotates and changes position with the tool holder, it drives the limiting protrusion to engage or disengage with the limiting groove. The corresponding lower edge of the tool handle is also provided with a cutting edge to accommodate the rotation of the limiting protrusion.

2. The safety utility knife according to claim 1, characterized in that: The scraper head includes a scraper cover, a spring, a scraper change button, and a scraper holder. The scraper cover has a slot to accommodate the scraper change button and the spring, and the slot corresponds to the shape of the scraper change button. The scraper change button is rotatably connected inside the scraper cover. The spring is located between the scraper change button and the scraper cover. The scraper change button also has a limiting protrusion that engages with the opening of the scraper blade. The outer surfaces of the scraper cover and the scraper holder also have corresponding rotating protrusions. The top surface of the scraper cover also has a first engaging groove and a second engaging groove that engage with the blade holder. The first engaging groove and the second engaging groove are vertically distributed on the upper and right sides of the scraper cover with the rotating protrusion as the center. The distance from the bottom of the second engaging groove to the rotating protrusion is less than the distance from the bottom of the first engaging groove to the rotating protrusion, so that the displacement is different when the blade holder engages with the scraper head. The scraper holder is fastened to the scraper cover by screws.

3. A safety utility knife according to claim 1, characterized in that: The scraper head includes a scraper cover and a scraper holder. The scraper cover has a cylindrical protrusion inside to accommodate the scraper blade. The outer surface of the scraper holder has a rotating protrusion. A hollow sleeve is installed at a corresponding position on the outer surface of the scraper cover. The outer wall of the hollow sleeve is rotatably connected to the scraper cover, and the inner wall is threaded. A handle is screwed onto the upper part of the hollow sleeve. Rotating the handle to bring it close to the scraper holder presses the scraper blade together. Rotating it in the opposite direction moves the handle away from the scraper holder, releasing the scraper blade. Replace the scraper blade; the top surface of the scraper cover is also provided with a first locking groove and a second locking groove that engage with the blade holder. The first locking groove and the second locking groove are vertically distributed on the upper and right sides of the scraper cover with the hollow sleeve as the center. The distance from the bottom of the second locking groove to the hollow sleeve is less than the distance from the bottom of the first locking groove to the hollow sleeve, so that the displacement is different when the blade holder engages with the scraper head. The scraper blade holder is fastened to the scraper cover by screws and is rotatably connected to the blade holder by rotating protrusions and hollow sleeves.

4. A safety utility knife according to claim 2 or 3, characterized in that: The blade holder includes a rotating blade base, a return spring, a safety lock, and a rotating blade cover. The rotating blade base has a long groove in the middle for placing the spring. Guide strips are arranged parallel to each other on the upper and lower sides of the long groove and are slidably connected to the bottom surface of the safety lock. The tail of the rotating blade base is also provided with a limiting toothed ring that engages with the rotating button. The bottom of the safety lock engages with the guide strip and the tail is connected to the return spring. The rotating blade cover has an opening at the top, which exposes the upper part of the safety lock when connected to the rotating blade base screw. The head of the safety lock is also provided with a limiting post that engages with the blade head, and a limiting block is fixedly connected to the tail of the upper part.

5. A safety utility knife according to claim 4, characterized in that: The handle includes a blade base, a blade retaining groove, a blade case cover, a blade cover, and a belt buckle. The blade retaining groove is fastened to the inner top surface of the blade base by bolts and is used to hold spare blades. The blade base and the front of the blade cover are rotatably connected to the blade holder and the rotating assembly. The blade case cover is rotatably connected to the top of the blade base and the blade cover and is used to close and cover the blade retaining groove. The belt buckle is fastened to the blade cover by screws.

6. A safety utility knife according to claim 5, characterized in that: A limiting groove is provided at the center of the front end of the inner side of the blade cover, dividing the edge of the blade cover into upper and lower parts. The upper edge of the blade cover is tightly fastened to the bottom of the blade, and the lower edge is opened with a cutting edge. When connected to the bottom of the blade, the gap between the cutting edge and the bottom of the blade is greater than the height of the limiting block, so that the limiting block can rotate downward along the cutting edge after it is disengaged from the limiting groove, without interfering with the blade cover.

7. A safety utility knife according to claim 2 or 3, characterized in that: The blade head is also equipped with a rotating angle, which is divided into two parts and fixed to the blade holder and blade cover respectively.

8. A safety utility knife according to claim 2, characterized in that: The blade change button consists of a rotating part and a blade locking part. The rotating part is square, with a blade head extending outward from the upper end. Rotating shafts that are rotatably connected to the slot are provided on both sides of the lower end. The blade locking part is fixedly connected to the lower end of the rotating part. A cylindrical protrusion for limiting the blade is provided on its outer surface. The limiting protrusion is fixed to the lower end of the blade locking part and is located directly above the slot. A spring is installed in an arch shape directly below the limiting protrusion. When the rotating part is turned, the blade locking part is driven to squeeze the spring, and the limiting protrusion moves towards the spring, causing the blade to disengage from the limiting protrusion, so that the blade can be removed for blade change.

9. A safety utility knife according to claim 3, characterized in that: The blade holder is also provided with a stop bar on its side. The height of the stop bar is the same as that of the cylindrical protrusion, and it is located on both sides close to the cylindrical protrusion.

Images