Dust-free chalk sleeve for teaching

Abstract

The utility model relates to the technical field of chalk sleeves, and discloses a dust-free chalk sleeve for teaching, which comprises a chalk body, the outer side of the chalk body is provided with a convenient adjusting mechanism, the convenient adjusting mechanism comprises a shell, the interior of the shell is connected with a clamping seat in a sliding manner, an adjusting disc is arranged below the clamping seat, and the outer surface of the adjusting disc is fixedly connected with a limiting rod. The inner wall of the clamping base is rotationally connected with a rotating disc and a connecting column, and the outer surface of the shell is provided with a sliding guide groove and a plurality of same limiting grooves. According to the dust-free chalk sleeve for teaching, through mutual cooperation of the chalk body, the shell, the sliding guide groove, the limiting groove, the clamping base, an adjusting disc, a rotary disc, a connecting column, a limiting rod and an arc-shaped push plate, the chalk body can be clamped into the clamping base, and then the chalk body can slide along with vertical sliding of the clamping base in the shell; the rotation of the connecting column on the inner wall of the clamping seat can enable the adjusting disc, the rotating disc and the limiting rod to rotate synchronously without affecting the up-down sliding of the clamping seat in the chalk body.

Description

Technical Field

[0001] This utility model relates to the field of chalk sleeve technology, specifically a dust-free chalk sleeve for teaching. Background Technology

[0002] A chalk sleeve is an auxiliary tool used to wrap chalk. It is generally a sleeve structure that fits the chalk and is usually made of materials such as plastic. Teachers use chalk sleeves during the teaching process to prevent chalk dust from sticking to their hands and causing corrosion to their skin.

[0003] The existing utility model with authorization announcement number CN214492256U discloses an adjustable chalk clip for education and teaching. By using an adjustable pushing mechanism inside the chalk clip, the length of the chalk extending out of the clip body can be freely adjusted according to the wear of the chalk, thus making it suitable for users with various writing habits. It can maximize the use of chalk and reduce chalk consumption. By using a clamping spring and a chalk clamping plate to hold the chalk, it can be used in any position of the chalk, thus making the chalk clamping more stable. Compared with the chalk clips currently in use, it is more stable in use.

[0004] While the above technical solution can maximize the use of chalk and provide a more stable chalk clamping, it requires both hands to adjust the chalk extension length. It lacks a convenient adjustment structure that allows for single-handed adjustment, increasing the cumbersomeness of adjusting the chalk extension length each time.

[0005] Therefore, those skilled in the art have provided a dust-free chalk cover for teaching purposes to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this utility model is to provide a dust-free chalk cover for teaching, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A dust-free chalk cover for teaching includes a chalk body, and a convenient adjustment mechanism is provided on the outer side of the chalk body;

[0009] The convenient adjustment mechanism includes a housing, a card seat is slidably connected inside the housing, an adjustment plate is provided below the card seat, a limit rod is fixedly connected to the outer surface of the adjustment plate, an arc-shaped push plate is provided on the outer side of the housing, a turntable and a connecting column are rotatably connected to the inner wall of the card seat, and a sliding guide groove and several identical limit grooves are respectively opened on the outer surface of the housing.

[0010] As a further embodiment of this utility model: the inner wall of the arc-shaped push plate is fixedly connected to the end of the limiting rod away from the adjusting plate; the two ends of the connecting column are fixedly connected to the bottom surface of the turntable and the upper surface of the adjusting plate, respectively; a first anti-slip pad is fixedly connected to the outer surface of the outer shell; and several identical anti-slip protrusions are fixedly connected to the outer surface of the first anti-slip pad.

[0011] As a further improvement of this utility model: the inner wall of the card holder is fixedly connected with a first elastic anti-slip ring, and the inner wall of the first elastic anti-slip ring is in contact with the outer surface of the chalk body.

[0012] As a further improvement of this utility model: two limiting guide posts are fixedly connected to the outer surface of the card holder, and the outer surface of each limiting guide post is slidably connected to the inside of the outer shell.

[0013] As a further improvement of this utility model: a second anti-slip pad is fixedly connected to the outer surface of the arc-shaped push plate, and a plurality of identical anti-slip convex discs are fixedly connected to the outer surface of the second anti-slip pad.

[0014] As a further improvement of this utility model: a second elastic anti-slip ring is fixedly connected to the outer surface of the limiting rod, and the outer surface of the second elastic anti-slip ring is in contact with the inner wall of one of the limiting grooves.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention utilizes the interplay of a chalk body, outer shell, sliding guide groove, limiting groove, card holder, adjusting disc, turntable, connecting column, limiting rod, and arc-shaped push plate. The chalk body can be inserted into the card holder, allowing it to slide up and down along with the card holder within the outer shell. The rotation of the connecting column on the inner wall of the card holder allows the adjusting disc, turntable, and limiting rod to rotate synchronously without affecting the card holder's up-and-down sliding within the chalk body. Furthermore, by holding the outer shell with one hand, the thumb of that hand can easily push the arc-shaped push plate up and down along the sliding guide groove or left and right along a limiting groove. This facilitates one-handed adjustment of the chalk body's extension length, increasing the convenience of chalk adjustment and avoiding the cumbersome problem of needing two hands for each adjustment due to the lack of a convenient one-handed adjustment structure. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a dustless chalk cover for teaching purposes;

[0018] Figure 2 A side view of the three-dimensional structure of the outer shell of a dustless chalk case for teaching purposes;

[0019] Figure 3 A schematic diagram of the three-dimensional structure of a card holder in a dustless chalk sleeve for teaching purposes;

[0020] Figure 4 A side-view sectional three-dimensional structural diagram of a card holder in a dustless chalk sleeve for teaching purposes;

[0021] Figure 5 A cross-sectional three-dimensional structural diagram of a turntable in a dustless chalk holder for teaching purposes;

[0022] Figure 6 This is a side view of the three-dimensional structure of the card holder in a dustless chalk holder for teaching.

[0023] In the diagram: 1. Chalk body; 2. Convenient adjustment mechanism; 201. Outer shell; 202. Sliding guide groove; 203. Limiting groove; 204. Card seat; 205. Adjustment plate; 206. Turntable; 207. Connecting column; 208. Limiting rod; 209. Arc-shaped push plate; 3. First anti-slip pad; 4. Anti-slip protrusion; 5. First elastic anti-slip ring; 6. Limiting guide column; 7. Second elastic anti-slip ring; 8. Second anti-slip pad; 9. Anti-slip protrusion. Detailed Implementation

[0024] Please see Figure 1-6 A dustless chalk cover for teaching includes a chalk body 1. A convenient adjustment mechanism 2 is provided on the outer side of the chalk body 1. The convenient adjustment mechanism 2 includes a shell 201. A card seat 204 is slidably connected inside the shell 201. A first anti-slip pad 3 is fixedly connected to the outer surface of the shell 201. Several identical anti-slip protrusions 4 are fixedly connected to the outer surface of the first anti-slip pad 3. By setting the anti-slip protrusions 4, the anti-slip property of the outer surface of the first anti-slip pad 3 can be increased. By setting the first anti-slip pad 3 and the anti-slip protrusions 4, the anti-slip property of the outer surface of the shell 201 can be increased together.

[0025] An adjustment plate 205 is provided below the card holder 204. A limit rod 208 is fixedly connected to the outer surface of the adjustment plate 205. A first elastic anti-slip ring 5 is fixedly connected to the inner wall of the card holder 204. The inner wall of the first elastic anti-slip ring 5 is in contact with the outer surface of the chalk 1. By setting the first elastic anti-slip ring 5, it has good elasticity and inner wall anti-slip properties, so it can be more stable after the chalk 1 is inserted into the card holder 204.

[0026] An arc-shaped push plate 209 is provided on the outer side of the outer shell 201. The inner wall of the arc-shaped push plate 209 is fixedly connected to the end of the limiting rod 208 away from the adjusting plate 205. Two limiting guide posts 6 are fixedly connected to the outer surface of the card holder 204. The outer surface of each limiting guide post 6 is slidably connected to the inside of the outer shell 201. By setting the limiting guide post 6, it can slide up and down in a directional manner inside the outer shell 201, thereby making the card holder 204 more stable when sliding up and down along the inside of the outer shell 201.

[0027] The inner wall of the card holder 204 is rotatably connected to a turntable 206 and a connecting post 207. The two ends of the connecting post 207 are fixedly connected to the bottom surface of the turntable 206 and the upper surface of the adjusting plate 205, respectively. A second anti-slip pad 8 is fixedly connected to the outer surface of the arc-shaped push plate 209. Several identical anti-slip convex plates 9 are fixedly connected to the outer surface of the second anti-slip pad 8. By setting the anti-slip convex plates 9, the anti-slip properties of the outer surface of the second anti-slip pad 8 can be increased. By setting the second anti-slip pad 8 and the anti-slip convex plates 9, the anti-slip properties of the outer surface of the arc-shaped push plate 209 can be increased together, thus making it more stable when the arc-shaped push plate 209 is pressed and pushed by one thumb.

[0028] The outer surface of the outer casing 201 is provided with sliding guide grooves 202 and several identical limiting grooves 203. The outer surface of the limiting rod 208 is fixedly connected with a second elastic anti-slip ring 7. The outer surface of the second elastic anti-slip ring 7 is in contact with the inner wall of one of the limiting grooves 203. By setting the second elastic anti-slip ring 7, the elasticity and anti-slip properties of the outer surface of the limiting rod 208 can be increased, so that the limiting rod 208 is not easy to slide out of the limiting groove 203 after it is turned into the limiting groove 203.

[0029] The working principle of this utility model is as follows: In use, the chalk body 1 is first inserted into the holder 204 and the first elastic anti-slip ring 5. Then, guided by the two limiting guide posts 6, the chalk body 1 is fed into the housing 201 as the holder 204 slides within the housing 201. When it is necessary to adjust the length of the chalk body 1 extending beyond the top of the housing 201, while holding the housing 201, the first anti-slip pad 3, and the anti-slip protrusion 4 with one hand, the thumb of that hand presses down on the second anti-slip pad 8 and the anti-slip protrusion 9, and the arc-shaped push plate 209 is pushed up and down along the sliding guide groove 202 until the length of the chalk body 1 extending beyond the top of the housing 201 reaches the desired length. Then, the thumb of that hand presses down on the second anti-slip pad 8 and the anti-slip protrusion 9. The anti-slip pad 8 and anti-slip convex plate 9 push the arc-shaped push plate 209 and the limiting rod 208 to the left along a limiting groove 203. At the same time, the turntable 206 and the connecting column 207 rotate with the adjusting plate 205 and the limiting rod 208 until the limiting rod 208 and the second elastic anti-slip ring 7 are stably inserted into the limiting groove 203. This makes it convenient to adjust the length of the chalk body 1 extending out of the outer shell 201 with one hand, which increases the convenience of chalk adjustment. The design of the entire dustless chalk sleeve for teaching effectively solves the problem that the lack of a convenient adjustment structure that allows for one-handed adjustment of the chalk extension length has increased the cumbersomeness of adjustment due to the need for two hands to operate each time the chalk extension length is adjusted.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dustless chalk set for teaching purposes, comprising a chalk body (1), characterized in that: The outer side of the chalk body (1) is provided with a convenient adjusting mechanism (2); The convenient adjusting mechanism (2) comprises a shell (201), a clamping seat (204) is slidably connected inside the shell (201), an adjusting disc (205) is arranged below the clamping seat (204), a limiting rod (208) is fixedly connected to the outer surface of the adjusting disc (205), an arc-shaped push plate (209) is arranged on the outer side of the shell (201), a rotating disc (206) and a connecting column (207) are respectively rotatably connected to the inner wall of the clamping seat (204), and a sliding guide groove (202) and a plurality of same limiting grooves (203) are respectively formed in the outer surface of the shell (201).

2. A dustless chalk set for teaching according to claim 1, characterized in that: The inner wall of the arc-shaped push plate (209) is fixedly connected to the end of the limiting rod (208) away from the adjusting disc (205), the two ends of the connecting column (207) are fixedly connected to the bottom surface of the rotating disc (206) and the upper surface of the adjusting disc (205), a first anti-skid pad (3) is fixedly connected to the outer surface of the shell (201), and the outer surface of the first anti-skid pad (3) is fixedly connected with a plurality of same anti-skid convex columns (4).

3. A dustless chalk set for teaching according to claim 1, characterized in that: The inner wall of the clamping seat (204) is fixedly connected with a first elastic anti-skid ring (5), and the inner wall of the first elastic anti-skid ring (5) is in contact with the outer surface of the chalk body (1).

4. A dustless chalk set for educational use according to claim 1, characterized in that: The outer surface of the clamping seat (204) is fixedly connected with two limiting guide columns (6), and the outer surface of each limiting guide column (6) is slidably connected with the inner part of the shell (201).

5. A dustless chalk set for educational purposes according to claim 1, characterized in that: The outer surface of the arc-shaped push plate (209) is fixedly connected with a second anti-skid pad (8), and the outer surface of the second anti-skid pad (8) is fixedly connected with a plurality of same anti-skid convex discs (9).

6. A dustless chalk set for educational purposes according to claim 1, characterized in that: The outer surface of the limiting rod (208) is fixedly connected with a second elastic anti-skid ring (7), and the outer surface of the second elastic anti-skid ring (7) is in contact with the inner wall of one of the limiting grooves (203).

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