A stepless adjustment art knife

Abstract

The present application belongs to the technical field of art knife, especially relates to a stepless adjustment art knife. The stepless adjustment art knife comprises a shell, an adjustment mechanism and a blade arranged on the adjustment mechanism. The adjustment mechanism comprises a sliding block arranged in the shell, a connecting block on the sliding block, a pressing sleeve arranged on the connecting block, and a reset spring arranged between the connecting block and the pressing sleeve. A locking groove is arranged on the lower end surface of the sliding block. The distance between the groove bottom of the locking groove and the lower end surface of the sliding block gradually decreases from the middle to both sides. Two locking balls fixedly connected at both ends of a locking spring are arranged in the locking groove. A sliding through groove penetrating through the connecting block is arranged on the outer side of each of the two locking balls. A sliding plate slidingly arranged in the sliding through groove is arranged on the pressing sleeve. The present application can steplessly adjust the extension length of the blade, and the locking operation of the blade is convenient, and the adjustment process is basically silent.

Description

Technical Field

[0001] This invention belongs to the field of utility knife technology, and particularly relates to a stepless adjustable utility knife. Background Technology

[0002] In existing technologies, the utility knife blade is typically housed within a protective casing. During use, the blade is extended out of the casing a suitable length and locked in place. Thus, the length of the blade in use is the length extending out of the casing, and this length is adjustable. Existing technologies employ locking mechanisms where slots and latches are respectively located on the connector between the casing and the blade. Pressing or pushing engages the latches and slots. Several slots are typically provided, allowing the latches to connect with different slots to adjust the length of the blade extending out of the casing.

[0003] The above adjustment methods are limited by the location of the slot, making stepless adjustment impossible, and a clanging sound is produced when the buckle and slot are engaged. Another method involves locking the blade with a threaded lock; after adjusting the length of the blade extending from the protective cover, a screw or stud is used to tighten the blade. While this method offers stepless adjustment and is relatively quiet, it requires rotating the thread to lock and loosen the blade before and after each use, which is cumbersome and unpopular with users. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this application provides a continuously adjustable utility knife that can steplessly adjust the blade extension length, has convenient blade locking operation, and operates with minimal noise during the adjustment process.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A continuously adjustable utility knife includes a housing, an adjustment mechanism, and a blade disposed on the adjustment mechanism. The adjustment mechanism includes a slider slidably disposed within the housing, a connecting block disposed on the upper end face of the slider and extending to the outside of the housing, a pressing sleeve slidably sleeved on the connecting block, and a return spring disposed between the connecting block and the pressing sleeve.

[0007] A locking groove is provided on the lower end face of the slider. The distance between the bottom of the locking groove and the lower end face of the slider gradually decreases from the middle to both sides. Two locking balls are respectively fixedly connected to both ends of the locking spring in the locking groove. Sliding grooves for penetrating the connecting block are respectively opened on the outer side of the two locking balls. A sliding plate that slides through the sliding groove is provided on the pressing sleeve.

[0008] When the pressing sleeve is not pressed, the locking ball presses against the housing to lock the blade; when the pressing sleeve is pressed, the sliding plate squeezes the locking ball to adjust the blade.

[0009] Preferably, a cover plate is fixedly connected to the lower end face of the slider, and a guide groove is formed on the cover plate along the length direction of the slider, and the locking ball can slide through the guide groove.

[0010] Preferably, a slot is provided on the vertical end face of the connecting block, and a claw that can be slidably engaged in the slot is provided on the lower end face of the pressing sleeve.

[0011] Preferably, a plurality of spring mounting slots are provided on the upper end face of the connecting block, and the reset spring is fixedly embedded in the spring mounting slots.

[0012] Preferably, a guide rod is provided in the spring mounting groove, and the reset spring is sleeved on the guide rod.

[0013] Preferably, the upper end face of the pressing sleeve is provided with anti-slip protrusions.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] When the pressing sleeve is not pressed, the locking spring pushes the locking balls to both sides, causing the locking balls to press against the groove wall and the housing, thus providing an initial force to both sides to lock the position of the slider and the blade. Furthermore, due to the structural design of the locking groove, the locking balls have a self-locking function; that is, when the slider slides back and forth, it will drive one of the locking balls to move towards the edge of the locking groove, thus ensuring that the locking balls are locked and do not loosen, further improving the locking ability of the slider and the blade. After the pressing sleeve is pressed, the sliding plate squeezes the locking balls, causing the two locking balls to move towards the center of the locking groove. At this time, the locking balls are no longer in contact with the housing or the pressure with the housing is small. Pushing the pressing sleeve along the length of the slider can adjust the position of the slider machine blade. Releasing the pressing sleeve then locks the blade position. Therefore, through the above structure, compared with the prior art, this invention can achieve stepless adjustment of the blade extension length with strong locking force, convenient blade locking operation, and virtually silent adjustment process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the present invention after removing the outer shell and the limiting block.

[0018] Figure 3 This is a schematic diagram of the adjustment mechanism of the present invention.

[0019] Figure 4 This is a half-sectional schematic diagram of the adjustment mechanism of the present invention.

[0020] Figure 5 This is a schematic diagram of the connection structure of the slider, connecting block and reset spring of the present invention.

[0021] Figure 6 This is a schematic diagram of the pressing sleeve of the present invention.

[0022] Figure 7 This is a schematic diagram of the connection structure of the slider, locking ball, locking spring and cover plate of the present invention.

[0023] Figure 8 This is a schematic diagram of the connection structure of the slider, locking ball, and locking spring of the present invention.

[0024] In the diagram: 1. Housing, 11. Outer shell, 12. Inner shell, 13. Limiting block, 2. Adjusting mechanism, 21. Slider, 211. Locking groove, 212. Connecting column, 22. Connecting block, 221. Slot, 222. Spring mounting groove, 223. Guide rod, 224. Sliding through groove, 23. Pressing sleeve, 231. Claw, 232. Slide plate, 233. Anti-slip protrusion, 24. Return spring, 25. Locking spring, 26. Locking ball, 27. Fastening bolt, 28. Cover plate, 281. Guide through groove, 3. Blade. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention. Example

[0027] See Figure 1 , 2As shown, a continuously adjustable utility knife includes a housing 1, an adjustment mechanism 2, and a blade 3 mounted on the adjustment mechanism 2. In this embodiment, the housing 1 includes an outer shell 11, an inner shell 12, and a limiting block 13. The outer shell 11 can be made of plastic, and the inner shell 12 can be made of metal to enhance the connection strength with the blade 3 during use. Both the outer shell 11 and the inner shell 12 are hollow structures with openings at both ends, and a groove communicating with their inner cavity is formed on their upper end face. The inner shell 12 is embedded in the inner cavity of the outer shell 11. To facilitate the installation and disassembly of the adjustment mechanism 2, a limiting block 13 is detachably and fixedly embedded at the rear end of the outer shell 11. The specific structure of the outer shell 11 and the inner shell 12 can also adopt existing technology.

[0028] See Figures 3 to 8 As shown, the adjustment mechanism 2 includes a slider 21 that is slidably disposed in the inner housing 12, a connecting block 22 that is integrally formed with the slider 21 on the upper end surface of the slider 21 and extends to the outer side of the outer housing 11, a pressing sleeve 23 that is slidably sleeved on the connecting block 22, and a return spring 24 disposed between the connecting block 22 and the pressing sleeve 23.

[0029] Specifically, a plurality of spring mounting slots 222 are provided on the upper end face of the connecting block 22. In this embodiment, three spring mounting slots 222 are provided, and the return spring 24 is vertically fixedly embedded in the spring mounting slots 222. Furthermore, in order to improve the stability of the return spring 24 during compression and rebound, a guide rod 223 is vertically fixedly connected in the spring mounting slot 222, and the return spring 24 is sleeved on the guide rod 223.

[0030] Vertical grooves 221 are formed on the vertical end faces of both sides of the connecting block 22. A claw 231, integrally formed with the pressing sleeve 23, is provided on the lower end face of the pressing sleeve 23 and can be slidably engaged within the grooves 221. The claw 231 can be made of an elastic material to facilitate the mounting of the pressing sleeve 23 on the connecting block 22 and its vertical movement along the grooves 221. To increase the travel of the claw 231, the grooves 221 can extend downwards to the lower end face of the slider 21.

[0031] A locking groove 211 is provided on the lower end face of the slider 21 along the length of the slider. The distance between the bottom of the locking groove 211 and the lower end face of the slider 21 gradually decreases from the middle to both sides. Of course, in order to reduce the difficulty of opening the locking groove 211, an arch bridge component with a locking groove 211 can also be used directly, that is, the arch bridge component is fixedly embedded on the lower end face of the slider 21.

[0032] Two locking balls 26 are respectively welded or snapped onto both ends of the locking spring 25 within the locking groove 211. The locking balls 26 can be made of frosted steel balls, smooth steel balls, or other materials. Vertical sliding grooves 224 are respectively formed on the outer sides of the two locking balls 26, extending from the upper end face of the connecting block 22 to the bottom of the locking groove 211 and connecting to the locking groove 211. A sliding plate 232 is integrally formed vertically on the horizontal end face of the inner cavity of the pressing sleeve 23, slidingly passing through the sliding groove 224.

[0033] When the sliding plate 232 presses the locking ball 26 into the middle of the locking groove 211, the locking ball 26 is limited and guided. In this embodiment, a cover plate 28 is fixedly connected to the lower end face of the slider 21 by fastening bolts 27. A guide groove 281 is provided on the cover plate 28 along the length direction of the slider 21. The lower part of the locking ball 26 can slide through the guide groove 281 and extend to the bottom of the guide groove 281 to achieve the pressing effect on the inner shell 12.

[0034] Furthermore, to facilitate pressing and pushing the pressing sleeve 23, anti-slip protrusions 233 are provided on the upper surface of the pressing sleeve 23.

[0035] Furthermore, to facilitate the installation of the blade 3 on the slider 21, a connecting post 212 is integrally formed vertically on the upper end face of the front end of the slider 21, and the tail of the blade 3 can be sleeved on the connecting post 212.

[0036] Thus, through the above structure, when the pressing sleeve 23 is not pressed, the locking ball 26 presses against the inner housing 12 to lock the blade 3. When the pressing sleeve 23 is pressed, the sliding plate 232 squeezes the locking ball 26 to disengage the locking ball 26 from the inner housing 12 or reduce the pressure between the locking ball 26 and the inner housing 12, thereby pushing the pressing sleeve 23 to adjust the blade 3.

[0037] The installation and usage process of this invention is as follows:

[0038] 1. As described above, install the various components of this invention as follows: Figure 1 As shown;

[0039] 2. When the pressing sleeve 23 is not pressed, the sliding plate 232 can disengage from the locking ball 26, and the two ends of the locking spring 25 press against the locking ball 26. Under the action of the locking groove 211, the locking ball 26 is subjected to a downward force, thereby pressing against the bottom of the locking groove 211 and the inner housing 12 respectively. At this time, the blade 3 is in the locked state.

[0040] 3. When the position of the blade 3 needs to be adjusted, press the pressing sleeve 23 to make the sliding plate 232 abut against the locking ball 26 and continue to move downward so that the two locking balls 26 move towards each other. Since the distance between the bottom of the middle part of the locking groove 211 and the lower end face of the slider 21 is large, the locking ball 26 can disengage from the inner housing 12, or reduce the pressure between the locking ball 26 and the inner housing 12. Then push the pressing sleeve 23 to adjust the position of the blade 3. After the adjustment is completed, release the pressing sleeve 23. The pressing sleeve 23 and the sliding plate 232 return to the initial position, i.e., the working state of step 2, under the action of the return spring 24. At this time, the locking of the blade 3 is completed.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuously adjustable craft knife comprising a housing, an adjustment mechanism, a blade disposed on the adjustment mechanism, characterized in that: The adjusting mechanism comprises a sliding block arranged in the shell, a connecting block arranged on the upper end surface of the sliding block and extending to the outside of the shell, a pressing sleeve arranged on the connecting block, and a reset spring arranged between the connecting block and the pressing sleeve. A locking groove is arranged on the lower end surface of the sliding block, the distance between the groove bottom and the lower end surface of the sliding block gradually decreases from the middle to both sides, two locking balls fixedly connected at both ends of the locking spring are arranged in the locking groove, and a sliding through groove penetrating through the connecting block is arranged on the outer side of each locking ball. When the pressing sleeve is not pressed, the locking balls tightly press against the shell to lock the blade, and when the pressing sleeve is pressed, the sliding plate extrudes the locking balls to adjust the blade.

2. The infinitely adjustable utility knife of claim 1, wherein: A cover plate is fixedly connected to the lower end surface of the sliding block, a guide through groove is arranged on the cover plate along the length direction of the sliding block, and the locking balls are slidably arranged in the guide through groove.

3. The infinitely adjustable utility knife of claim 1, wherein: A clamping groove is arranged on the vertical end surface of the connecting block, and a clamping claw slidably arranged in the clamping groove is arranged on the lower end surface of the pressing sleeve.

4. The infinitely adjustable utility knife of claim 1, wherein: A plurality of spring installation grooves are arranged on the upper end surface of the connecting block, and the reset spring is fixedly embedded in the spring installation grooves.

5. The infinitely adjustable utility knife of claim 4, wherein: A guide rod is arranged in the spring installation groove, and the reset spring is sleeved on the guide rod.

6. The infinitely adjustable utility knife of claim 1, wherein: An anti-skid protrusion is arranged on the upper end surface of the pressing sleeve.

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