Hand-injury-preventing type pencil sharpener

Abstract

The present application relates to pencil sharpener technical field, specifically to a kind of hand injury prevention type pencil sharpener, including knife rest, its inside is equipped with the lead pencil insertion pencil sharpening channel, first opening is equipped on the knife rest, first opening is communicated with pencil sharpening channel;Blade, it is set on the knife rest, blade is inclined downward along the insertion direction of lead pencil insertion pencil sharpening channel, and the cutting edge one end of blade is extended into pencil sharpening channel through first opening;Protection device, it is movably set in pencil sharpening channel, protection device is used to prevent the finger that extends into pencil sharpening channel from contacting blade, and protection device allows the lead pencil inserted into pencil sharpening channel to contact blade.The hand injury prevention type pencil sharpener of scheme is applicable to the planing and shaving of large diameter pencil, and the inside of pencil sharpener is equipped with protection device, to ensure that the finger of user is not directly contacted with blade in conventional state and extended into pencil hole, and the safety is higher;After large diameter pencil is extended into pencil hole, protection device is unlocked to realize planing and shaving.

Description

A hand-protecting pencil sharpener Technical Field

[0001] This invention relates to the field of pencil sharpener technology, specifically a pencil sharpener designed to prevent hand injuries. Background Technology

[0002] Traditional pencil sharpeners have small sharpening holes, generally only suitable for sharpening pencils with a small diameter (around 10mm). After the pencil sharpener is assembled, because the diameter of the sharpening hole is smaller than the outer diameter of the user's finger, the user's finger is less likely to directly contact the blade through the sharpening hole, making it relatively safe.

[0003] When sharpening pencils with a large diameter (>15mm), one might consider simply enlarging the size of the sharpening hole. However, traditional pencil sharpeners have a simple structure and lack protective devices for the internal blades. Children's fingers can easily reach into the sharpening hole and touch the blades, which can easily cause injury to their fingers, making them less safe. Summary of the Invention

[0004] The purpose of this invention is to propose a hand-protective pencil sharpener, which aims to solve the technical problem that existing pencil sharpeners cannot sharpen pencils with larger diameters, and that directly enlarging the size of the sharpening hole can easily cause injury to the fingers when they are inserted.

[0005] To achieve the above objectives, the present invention proposes a hand-protecting pencil sharpener, including a blade holder with a sharpening channel for inserting a pencil inside, and a first opening on the blade holder communicating with the sharpening channel.

[0006] A blade is mounted on the blade holder. The blade is inclined downward along the insertion direction of the pencil into the pencil sharpening channel. One end of the blade extends into the pencil sharpening channel through the first opening.

[0007] A protective device is movably disposed within the pencil sharpening channel, the protective device being used to prevent fingers inserted into the pencil sharpening channel from contacting the blade, and the protective device allowing pencils inserted into the pencil sharpening channel to contact the blade.

[0008] Preferably, the protective device includes a protective component, a spring, and an elastic self-locking component. The protective component is movably disposed within the sharpening channel of the tool holder. One end of the spring is sleeved on the end of the protective component, and the other end abuts against the inner wall of the tool holder. The elastic self-locking component is locked inside the tool holder.

[0009] The protective component has a pencil-sharpening cavity for inserting a pencil. A second opening is provided on the protective component, located below and communicating with the first opening. Two sidewalls located on either side of the second opening are referred to as the first sidewall and the second sidewall. The height of the first sidewall is greater than the height of the second sidewall. The blade extends into the pencil-sharpening hole through the first and second openings, with the blade edge located on one side of the first sidewall. A limiting part is provided at the bottom of the protective component, and a limiting step is provided inside the blade holder. A resilient self-locking member is located in front of the limiting step. A notch is provided along the outer edge of the protective component, and the top of the resilient self-locking member is located at the notch, such that:

[0010] When the pencil is not inserted into the pencil sharpening cavity, the limiting part is connected to the elastic self-locking member, and the height of the blade is higher than the height of the bottom end of the first side wall, so that the fingers inserted into the pencil sharpening cavity cannot touch the blade;

[0011] After the pencil is inserted into the pencil sharpening chamber, the outer wall of the pencil presses down on the elastic self-locking member, and the protective member is no longer connected to the elastic self-locking member. The pencil drives the protective member to move inward and press the spring until the limiting part abuts against the limiting step. The blade abuts against the second side wall, and the height of the blade is lower than the height of the bottom end of the first side wall.

[0012] Preferably, the inner wall of the protective component is provided with a plurality of arrayed protrusions, which are arranged along the axial direction of the pencil sharpening cavity.

[0013] Preferably, the tool holder has a mounting groove, the elastic self-locking member is engaged in the mounting groove, the top plate of the elastic self-locking member is recessed downward to form a through limiting groove, a connecting post is provided on the rear side of the limiting groove, and the top of the connecting post is inclined, such that:

[0014] When the pencil is not inserted into the pencil sharpening cavity, the limiting part is locked in the limiting groove, the protective member abuts against the elastic self-locking member, the top plate is located in the notch of the protective member, and the height of the blade is higher than the height of the bottom end of the first side wall;

[0015] After the pencil is inserted into the pencil-sharpening cavity, the outer wall of the inserted pencil presses down on the top plate, causing the limiting part to disengage from the limiting groove. The pencil drives the protective component to move inward and press the spring until the limiting part abuts against the limiting step. The height of the blade is lower than the height of the bottom end of the first side wall.

[0016] Preferably, the elastic self-locking member has arc-shaped elastic pressure plates on both sides, the height of the elastic pressure plates is greater than the height of the elastic self-locking member, and the bottom end of the elastic pressure plates is connected to the inner wall of the tool holder.

[0017] Preferably, the tool holder is further provided with two limiting posts for limiting the downward movement of the elastic self-locking member, and the limiting posts are located below the top plate.

[0018] Preferably, both the elastic self-locking component and the elastic pressure plate are made of polyoxymethylene.

[0019] Preferably, a chip discharge port is provided at the bottom of the tool holder.

[0020] Preferably, the tool holder is further provided with multiple guide channels, and the outer wall of the protective component is provided with multiple movable parts, each of the movable parts being movably disposed in each of the guide channels.

[0021] Preferably, one end of the tool holder is provided with a cover plate, the elastic self-locking member is located inside the cover plate and the outer side of the elastic self-locking member abuts against the cover plate, the end of the movable part abuts against the cover plate, the cover plate is provided with a through hole, and the through hole communicates with the pencil sharpening hole.

[0022] Preferably, the outer wall of the tool holder is also provided with several wavy anti-slip recesses.

[0023] The hand-protecting pencil sharpener disclosed in this invention has the following beneficial effects: This hand-protecting pencil sharpener is particularly suitable for sharpening large-diameter pencils. The diameter of the sharpening hole can be greater than 15mm. Because the pencil sharpener is equipped with a protective device, the protective component, spring, and elastic self-locking component work together to lock and unlock the protective device, ensuring that the user's fingers will not directly contact the blade when inserted into the sharpening hole under normal conditions, thus ensuring high safety. When a large-diameter pencil is inserted into the sharpening hole, the protective device unlocks, allowing the pencil to be sharpened. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the structure of the hand-protecting pencil sharpener of the present invention;

[0026] Figure 2 is an exploded view of the hand-protecting pencil sharpener of the present invention;

[0027] Figure 3 is a schematic cross-sectional view of the anti-injury pencil sharpener of the present invention when the pencil is not inserted into the sharpening chamber;

[0028] Figure 4 is a cross-sectional view of the anti-injury pencil sharpener of the present invention from another angle when the pencil is not inserted into the sharpening chamber;

[0029] Figure 5 is a schematic cross-sectional view of the anti-injury pencil sharpener of the present invention when a pencil is inserted into the sharpening chamber;

[0030] Figure 6 is a cross-sectional view of the anti-injury pencil sharpener of the present invention from another angle when the pencil is inserted into the sharpening chamber;

[0031] Figure 7 is a schematic diagram of the blade holder structure of the anti-injury pencil sharpener of the present invention;

[0032] Figure 8 is a schematic diagram of the elastic self-locking component structure of the anti-injury pencil sharpener of the present invention;

[0033] Figure 9 is a schematic diagram of the protective component structure of the anti-injury pencil sharpener of the present invention;

[0034] Figure 10 is a structural schematic diagram of the protective component of the hand-protecting pencil sharpener of the present invention from another angle.

[0035] In the attached diagram: 1-blade holder, 11-sharpening channel, 12-first opening, 13-limiting step, 14-mounting groove, 15-limiting post, 16-chip discharge port, 17-guide channel, 18-anti-slip recess, 2-blade, 21-blade edge, 3-protective device, 31-protective component, 311-sharpening cavity, 312-second opening, 313-first side wall, 314-second side wall, 315-limiting part, 316-notch, 317-protrusion, 318-moving part, 32-spring, 33-elastic self-locking component, 331-top plate, 332-limiting groove, 333-connecting post, 334-elastic pressure plate, 4-cover plate, 41-through hole, 5-screw, 6-pencil.

[0036] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0039] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] As shown in Figures 1 to 10, a hand-protecting pencil sharpener includes a blade holder 1, which has a pencil-sharpening channel 11 for inserting a pencil 6 inside. The blade holder 1 has a first opening 12, which communicates with the pencil-sharpening channel 11.

[0041] Blade 2 is mounted on the blade holder 1. Blade 2 is inclined downward along the insertion direction of pencil 6 into the pencil sharpening channel 11, and one end of the blade 21 is close to the pencil sharpening channel 11. One end of the blade 21 extends into the pencil sharpening channel 11 through the first opening 12.

[0042] The protective device 3 is movably disposed within the pencil sharpening channel 11. The protective device 3 is used to prevent fingers inserted into the pencil sharpening channel 11 from contacting the blade 2, and the protective device 3 allows pencils 6 inserted into the pencil sharpening channel 11 to contact the blade 2.

[0043] This anti-injury pencil sharpener is particularly suitable for sharpening large-diameter pencils 6. Its size can be set to be larger, specifically for sharpening pencils 6 with a diameter greater than 15mm (e.g., 17.5mm). Because the sharpener has a protective device 3 inside, even if the user inserts their fingers into the sharpening channel 11, they will not directly contact the blade 2, protecting their fingers from injury. The sharpening channel 11 is roughly cone-shaped or frustum-shaped with its diameter narrowing inwards, facilitating the insertion and sharpening of the pencil 6. When not in use, the protective device 3 prevents fingers from contacting the blade 2; when sharpening the pencil 6, the protective device 3 activates, allowing the pencil 6 inserted into the sharpening channel 11 to contact the blade 2 for sharpening.

[0044] Furthermore, the protective device 3 includes a protective member 31, a spring 32, and an elastic self-locking member 33. The protective member 31 is movably disposed within the sharpening channel 11 of the tool holder 1. One end of the spring 32 is sleeved on the end of the protective member 31, and the other end abuts against the inner wall of the tool holder 1. The elastic self-locking member 33 is locked within the tool holder 1.

[0045] The protective member 31 has a pencil-sharpening cavity 311 for inserting a pencil 6. A second opening 312 is provided on the protective member 31, located below and communicating with the first opening 12. Two sidewalls located on either side of the second opening 312 are referred to as the first sidewall 313 and the second sidewall 314. The height of the first sidewall 313 is higher than the height of the second sidewall 314. The blade 2 extends into the pencil-sharpening hole through the first opening 12 and the second opening 312, with the blade edge 21 located on one side of the first sidewall 313. A limiting part 315 is provided at the bottom of the protective member 31. A limiting step 13 is provided inside the blade holder 1. An elastic self-locking member 33 is located in front of the limiting step 13. A notch 316 is provided along the outer edge of the protective member 31, and the top of the elastic self-locking member 33 is located at the notch 316, such that:

[0046] When the pencil is not inserted into the pencil sharpening cavity, the limiting part 315 is connected to the elastic self-locking member 33, and the height of the blade 2 is higher than the height of the bottom end of the first side wall 313, so the fingers inserted into the pencil sharpening cavity 311 cannot touch the blade 2.

[0047] When the pencil is inserted into the pencil sharpening chamber, the outer wall of the pencil 6 presses down on the elastic self-locking member 33, and the protective member 31 is no longer connected to the elastic self-locking member 33. The pencil 6 drives the protective member 31 to move inward and press the spring 32 until the limiting part 315 abuts against the limiting step 13, and the blade 2 abuts against the second side wall 314, and the height of the blade 2 is lower than the height of the bottom end of the first side wall 313.

[0048] In this embodiment, the assembly process of the pencil sharpener is as follows: Place the blade 2 on the blade bed surface of the blade holder 1, and use the automatic screw-locking machine 5 to screw the safety screw 5 into the blade holder 1 through the hole of the blade 2. After assembly, the safety screw 5 presses the blade 2 with locking force. Assemble the spring 32 to the end of the protective member 31, and then install the protective member 31 into the blade holder 1. Press the elastic self-locking member 33 into the assembly position of the blade holder 1 and stand the elastic self-locking member 33 in the blade holder 1. After the protective member 31 and the elastic self-locking member 33 are assembled, the protective member 31 is in a self-locking state. At this time, the protective member 31 is locked by the elastic self-locking member 33 to ensure that it will not move in the pencil sharpening channel 11 of the blade holder 1. Since the height of the blade 2 is higher than the first side wall 313 of the protective member 31, the finger will not directly contact the blade 2 after being inserted. The height difference between the first side wall 313 and the blade 2 is the safety height (H1, specifically about 0.3mm), which has a good protective effect and high safety.

[0049] The external shape of the protective component 31 in this design fits the pencil sharpening channel 11, facilitating its movement within the channel. The sharpening cavity 311 of the protective component 31 is typically also designed in a conical or frustum shape to facilitate sharpening of the pencil 6. The spring 32, the protective component 31, and the elastic self-locking component 33 form a protective device 3. Under the action of the spring 32, the protective component 31 has a continuous outward force, and its end is constantly pressed against the elastic self-locking component 33. The limiting part 315 of the protective component 31 is also locked within the elastic self-locking component 33.

[0050] The specific usage process of the anti-injury pencil sharpener is as follows: When the user's finger is inserted into the sharpening hole, due to the existence of a safe height, the first side wall 313 (protective part 31) is always lower than the blade 21 of the blade 2, and the user cannot touch the blade 2. Generally, children's fingers are thinner and smaller than the sharpening hole, so they cannot fill the sharpening hole. Moreover, their fingers are relatively soft and do not easily press down the elastic self-locking part 33. Even if the finger pushes the protective part 31 inward, since the protective part 31 is not squeezed downward first to disengage from the elastic self-locking part 33, the elastic self-locking part 33 is always stably connected to the protective part 31. The protective part 31 will not move inward, and the finger will not directly contact the blade 2, thus ensuring high safety.

[0051] Furthermore, the inner wall of the protective member 31 is provided with a plurality of arrayed protrusions 317, which are arranged along the axial direction of the pencil-sharpening cavity 311. The protective member 31 also contains protrusions 317. When a user, such as a child, rotates their finger inside the pencil-sharpening hole, the presence of numerous protruding protrusions 317 inside the protective member 31 causes noticeable friction and discomfort, leading the user to abandon rotation within the sharpening hole. In this embodiment, the thickness of the protrusions 317 is generally set relatively small to avoid interfering with the pencil-sharpening process.

[0052] As shown in Figures 3 to 6, further, the tool holder 1 is provided with a mounting groove 14, and the elastic self-locking member 33 is engaged in the mounting groove 14. The top plate 331 of the elastic self-locking member 33 is recessed downward to form a through limiting groove 332. A connecting post 333 is provided on the rear side of the limiting groove 332. The top of the connecting post 333 is inclined, such that:

[0053] When the pencil is not inserted into the pencil sharpening cavity, the limiting part 315 is locked in the limiting groove 332, the protective member 31 abuts against the elastic self-locking member 33, the top plate 331 is partially located in the notch 316 of the protective member 31, and the height of the blade 2 is higher than the height of the bottom end of the first side wall 313.

[0054] When the pencil is inserted into the pencil sharpening cavity, the outer wall of the inserted pencil 6 presses down on the top plate 331, causing the limiting part 315 to disengage from the limiting groove 332. The pencil 6 drives the protective member 31 to move inward and press the spring 32 until the limiting part 315 abuts against the limiting step 13. The height of the blade 2 is lower than the height of the bottom end of the first side wall 313.

[0055] The elastic self-locking member 33 is elastic and has a special structure, thus achieving a good locking and unlocking effect for the protective member 31. When the user inserts the pencil 6 into the sharpening hole, the outer wall of the pencil 6 will contact the surface of the top plate 331 of the elastic self-locking member 33. When the user rotates and pushes the pencil 6 inward, the outer wall of the pencil 6 presses down the elastic self-locking member 33, causing the limiting part 315 of the protective member 31 to disengage from the limiting groove 332, thus unlocking the protective member 31. It continues to move into the blade holder 1 under the user's pushing force. Because the user's pushing force is greater than the elastic force of the spring 32, the protective member 31 will eventually be pushed to the working position by the user, that is, the position where the limiting part 315 abuts against the limiting step 13. At this time, the height of the blade 2 is lower than the height of the first side wall 313, and there is a planing working space (H2, specifically about 0.2mm) between the first side wall 313 and the blade 2. The user continues to rotate the pencil 6, and the pencil 6 planing process begins.

[0056] After the user finishes sharpening, the pencil 6 is removed from the sharpening hole. Under the action of the spring 32, the protective part 31 moves outward. When the limiting part 315 moves outward to the connecting post 333, due to the inclined top surface of the connecting post 333, the limiting part 315 will continue to slide outward along the inclined surface. When it continues to move outward to the limiting groove 332, the limiting part 315 is tightly locked in the limiting groove 332 again to achieve reset. At the same time, since there is no squeezing force from the pencil 6, the elastic self-locking part 33 will move upward under its own elastic force, so that the protective part 31 and the elastic self-locking part 33 re-form a locked protective device 3, and the safety protection of the pencil sharpener blade 2 is restarted.

[0057] Furthermore, the elastic self-locking member 33 is provided with arc-shaped elastic pressure plates 334 on both sides. The height of the elastic pressure plates 334 is greater than the height of the elastic self-locking member 33, and the bottom end of the elastic pressure plates 334 is connected to the inner wall of the tool holder 1. In this embodiment, elastic pressure plates 334 are provided on both sides of the elastic self-locking member 33. The bottom of the elastic pressure plates 334 is fastened and abutted against the bottom of the tool holder 1, and the top of the elastic pressure plates 334 is connected to the top plate 331 of the elastic self-locking member 33. The elastic self-locking member 33 is suspended. When it receives downward pressure, the elastic pressure plates 334 deform, and the elastic self-locking member 33 moves down, allowing the limiting part 315 to disengage from the limiting groove 332, which can better achieve the unlocking of the protection device 3.

[0058] Furthermore, the tool holder 1 is also provided with two limiting posts 15 for limiting the elastic self-locking member 33 when it is pressed down. The limiting posts 15 are located below the top plate 331.

[0059] To prevent the elastic pressure plate 334 from being damaged due to excessive downward pressure, a limiting post 15 is provided below the top plate 331. When the pencil 6 is pressed down to the limit position, the top plate 331 of the elastic self-locking member 33 abuts against the limiting post 15, thereby preventing the elastic self-locking member 33 from continuing to move down, and the elastic pressure plate 334 will not be damaged by excessive pressure.

[0060] Furthermore, both the elastic self-locking element 33 and the elastic pressure plate 334 are made of polyoxymethylene (POM). Both the elastic self-locking element 33 and the elastic pressure plate 334 can be made of POM material (polyoxymethylene). The POM material of the elastic self-locking element 33 and the elastic pressure plate 334 has good mechanical properties and a certain degree of elasticity, enabling the locking and unlocking of the protection device 3. At the same time, the POM material of the elastic self-locking element 33 and the elastic pressure plate 334 can withstand a large load, ensuring that the protection device 3 has a long service life.

[0061] Furthermore, a chip discharge port 16 is provided at the bottom of the tool holder 1. The chip discharge port 16 is mainly used to discharge small chips generated when sharpening the pencil 6. Except for the sharpening hole, the inside of the tool holder 1 is basically a closed structure, and small chips that fall into the tool holder 1 can be discharged from the chip discharge port 16 at the bottom. Usually, the chip discharge port 16 is located below the elastic self-locking member 33, and the chip discharge port 16 communicates with the limiting groove 332. This is mainly because most chips can be poured out directly through the sharpening hole, while some small chips may easily accumulate at the connection between the protective member 31 and the elastic self-locking member 33. These small chips can be discharged through the chip discharge port 16 and will not accumulate inside the tool holder 1.

[0062] Furthermore, the tool holder 1 is provided with multiple guide channels 17, and the outer wall of the protective member 31 is provided with multiple movable parts 318, each of which is movably disposed within each guide channel 17. Two guide channels 17 are provided on the left and right sides of the tool holder 1, and two movable parts 318 are also provided on the left and right sides of the outer wall of the protective member 31. The movable parts 318 are disposed within the guide channels 17 and can move along the guide channels 17, thus better realizing the locking and unlocking of the protective member 31. In this embodiment, the surface of the movable parts 318 is also provided with a wavy texture.

[0063] Furthermore, one end of the tool holder 1 is provided with a cover plate 4, the elastic self-locking member 33 is located inside the cover plate 4, and the outer side of the elastic self-locking member 33 abuts against the cover plate 4. The end of the movable part 318 abuts against the cover plate 4. The cover plate 4 is provided with a through hole 41, which communicates with the pencil sharpening hole. The cover plate 4 is fastened and locked onto the surface of the tool holder 1. The cover plate 4 and the inside of the tool holder 1 have a receiving space, and the elastic self-locking member 33 is located inside this receiving space. That is, the elastic self-locking member 33 is located inside the cover plate 4, and the protective member 31 is also located inside the cover plate 4. It communicates with the outside only through the through hole 41 and the pencil sharpening hole to realize the normal sharpening of the pencil 6.

[0064] Furthermore, the outer wall of the blade holder 1 is also provided with several wavy anti-slip recesses 18. The anti-slip recesses 18 on the outer wall of the blade holder 1 make it easier for the user to grip, which can increase the friction with the hand and make it easier for the user to grip the pencil sharpener to sharpen the pencil 6.

[0065] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A hand-protective pencil sharpener, characterized in that, include: A pencil holder (1) has a pencil-sharpening channel (11) for inserting a pencil (6) inside. The pencil holder (1) has a first opening (12) that communicates with the pencil-sharpening channel (11). A blade (2) is mounted on the pencil holder (1) and is inclined downwards along the insertion direction of the pencil (6) into the pencil-sharpening channel (11). One end of the blade (21) extends into the pencil-sharpening channel (11) through the first opening (12). A protective device (3) is movably mounted inside the pencil-sharpening channel (11) to prevent the pencil (6) from being inserted into the pencil-sharpening channel (11). The finger in the pencil sharpening channel (11) contacts the blade (2), and the protective device (3) allows the pencil (6) inserted into the pencil sharpening channel (11) to contact the blade (2); the protective device (3) includes a protective member (31), a spring (32) and an elastic self-locking member (33). The protective member (31) is movably disposed in the pencil sharpening channel (11). One end of the spring (32) is sleeved on the end of the protective member (31), and the other end abuts against the inner wall of the blade holder (1). The elastic self-locking member (33) is locked in the blade holder (1). The protective member (31) is provided with a way for the pencil (6) to be inserted. The pencil sharpening cavity (311) is provided with a second opening (312) on the protective member (31). The second opening (312) is located below and communicates with the first opening (12). The two side walls located on both sides of the second opening (312) are referred to as the first side wall (313) and the second side wall (314). The height of the first side wall (313) is higher than the height of the second side wall (314). The blade (2) extends into the pencil sharpening cavity through the first opening (12) and the second opening (312), and the cutting edge (21) of the blade (2) is located on one side of the first side wall (313). The bottom end of the protective component (31) is provided with a limiting part (315), the blade holder (1) is provided with a limiting step (13), the elastic self-locking component (33) is provided on the front side of the limiting step (13), the outer edge of the protective component (31) is provided with a notch (316), and the top of the elastic self-locking component (33) is located at the notch (316), so that when the pencil is not inserted into the pencil sharpening cavity, the limiting part (315) is connected to the elastic self-locking component (33), the height of the blade (2) is higher than the height of the bottom end of the first side wall (313), and the fingers inserted into the pencil sharpening cavity (311) cannot touch the blade (2).After the pencil is inserted into the pencil-sharpening cavity, the outer wall of the pencil (6) presses down on the elastic self-locking member (33), and the protective member (31) is no longer connected to the elastic self-locking member (33). The pencil (6) drives the protective member (31) to move inward and press the spring (32) until the limiting part (315) abuts against the limiting step (13), and the blade (2) abuts against the second side wall (314), and the height of the blade (2) is lower than the height of the bottom end of the first side wall (313).

2. The hand-protecting pencil sharpener according to claim 1, characterized in that, The inner wall of the protective component (31) is provided with a plurality of arrayed protrusions (317), which are arranged along the axial direction of the pencil sharpening cavity (311).

3. A hand-protective pencil sharpener according to claim 1, characterized in that, The tool holder (1) has a mounting groove (14) inside, and the elastic self-locking member (33) is engaged in the mounting groove (14). The top plate (331) of the elastic self-locking member (33) is recessed downward to form a through limiting groove (332). A connecting post (333) is provided on the rear side of the limiting groove (332). The top of the connecting post (333) is inclined so that when the pencil is not inserted into the pencil sharpening cavity, the limiting part (315) is engaged in the limiting groove (332), the protective member (31) abuts against the elastic self-locking member (33), and the top plate (331) part Located within the notch (316) of the protective component (31), the height of the blade (2) is higher than the height of the bottom end of the first sidewall (313); after the pencil is inserted into the pencil sharpening cavity, the outer wall of the inserted pencil (6) presses down on the top plate (331), causing the limiting part (315) to come out from the limiting groove (332), and the pencil (6) drives the protective component (31) to move inward to press the spring (32) until the limiting part (315) abuts against the limiting step (13), and the height of the blade (2) is lower than the height of the bottom end of the first sidewall (313).

4. A hand-protecting pencil sharpener according to claim 3, characterized in that, The elastic self-locking member (33) has arc-shaped elastic pressure plates (334) on both sides. The height of the elastic pressure plate (334) is greater than the height of the elastic self-locking member (33). The bottom end of the elastic pressure plate (334) is connected to the inner wall of the tool holder (1).

5. A hand-protecting pencil sharpener according to claim 4, characterized in that, The tool holder (1) is also provided with two limiting posts (15) for limiting the elastic self-locking member (33) when it is pressed down. The limiting posts (15) are located below the top plate (331).

6. A hand-protective pencil sharpener according to claim 4, characterized in that, Both the elastic self-locking component (33) and the elastic pressure plate (334) are made of polyoxymethylene.

7. A hand-protective pencil sharpener according to claim 1, characterized in that, A chip discharge port (16) is provided below the tool holder (1).

8. A hand-protective pencil sharpener according to claim 1, characterized in that, The tool holder (1) is also provided with multiple guide channels (17), and the outer wall of the protective component (31) is provided with multiple movable parts (318), each of the movable parts (318) being movably disposed in each of the guide channels (17).

9. A hand-protective pencil sharpener according to claim 8, characterized in that, One end of the tool holder (1) is provided with a cover plate (4), the elastic self-locking member (33) is located inside the cover plate (4), and the outer side of the elastic self-locking member (33) abuts against the cover plate (4), the end of the movable part (318) abuts against the cover plate (4), the cover plate (4) is provided with a through hole (41), and the through hole (41) communicates with the pencil sharpening cavity.

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