Chalk holder

Abstract

The utility model discloses a chalk holder which comprises a fixing cylinder, a sliding block is connected inside the fixing cylinder in a sliding mode, a pair of clamping blocks arranged in a mirror image mode are connected to the sliding block in a rotating mode, clamping plates are fixedly connected to the clamping blocks, a rack is connected to the inner wall of the fixing cylinder in a sliding mode, and a tooth block meshed with the rack in a one-way mode is connected to the sliding block in a sliding mode. According to the chalk clamping device, the clamping block is pressed through the pressing groove, a chalk is inserted into the fixing barrel, under pushing of a second spring, the clamping block drives the clamping plate to tightly abut against the chalk, separation of the chalk is limited, the fixing barrel avoids direct contact between the hand and the chalk, corrosion of the chalk to the hand is reduced, the pressing column is pressed, the rack is pushed to move, and the chalk is clamped. When the pressing column is pressed repeatedly, the tooth block is driven to move downwards, the sliding block moves downwards by a certain distance, the sliding block pushes the chalk to stretch out by a certain distance, writing again is facilitated, the chalk can be pushed out continuously by pressing the pressing column repeatedly, and feeding of the chalk is facilitated.

Description

Technical Field

[0001] The utility model relates to a clamp, in particular to a chalk clamp. Background Art

[0002] In the process of mathematics teaching, chalk is usually used to construct different mathematical models on the blackboard. Since chalk is mostly composed of lime, it can easily cause corrosion to hands during long-term direct contact.

[0003] In order to avoid direct contact between hands and chalk, chalk is usually equipped with a clamp. However, traditional clamps mostly use a rotary feed method to push out the chalk. The rotary feed method is slow in feeding chalk and requires two-handed operation. After the chalk is used up, it needs to be reversed and reset, which is cumbersome to operate. Utility Model Content

[0004] The utility model aims to provide a chalk holder to solve the problems of slow rotation feeding of chalk, reverse rotation and reset after using the chalk, and complicated operation.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a chalk clamp, comprising a fixed cylinder, a clamping mechanism connected to the fixed cylinder, the clamping mechanism comprising a slider, the fixed cylinder is slidably connected to the slider, a pair of mirror-arranged clamping blocks are rotatably connected to the slider, a clamping plate is fixedly connected to the clamping block, a second spring is installed between the pair of clamping blocks, a chalk is movably inserted into the fixed cylinder, a pair of clamping plates abut against the outer wall of one end of the chalk, a pressing groove for pressing the clamping block is provided on the outer wall of the fixed cylinder, and an abutment component for limiting the free sliding of the slider is connected to the slider;

[0006] The fixed cylinder is connected with a pushing mechanism, which includes a rack. The inner wall of the fixed cylinder is slidably connected with the rack. A third spring is installed between the rack and the fixed cylinder. The slider is slidably connected with a tooth block that is unidirectionally meshed with the rack. A fourth spring is installed between the tooth block and the slider. The outer wall of the tooth block is provided with an oblique groove. The clamping block is fixedly connected with a push rod that contacts the inner wall of the oblique groove.

[0007] As a preferred technical solution of the utility model, the resistance assembly includes a resistance block, the resistance block is slidably connected to the slider, a first spring is installed between the resistance block and the slider, the inner wall of the fixed cylinder is provided with a plurality of resistance grooves, and the resistance block extends into the interior of the resistance groove through the first spring, thereby limiting the free sliding of the slider.

[0008] As a preferred technical solution of the utility model, the push rod is in an "L"-shaped structure, and the end of the push rod that contacts the inner wall of the inclined groove is in an inclined surface, thereby facilitating the separation of the tooth block and the rack and facilitating the resetting of the slider.

[0009] As a preferred technical solution of the utility model, the end of the interference block extending into the interference groove is a hemispherical structure, and the multiple interference grooves are arranged linearly, thereby preventing the rack from driving the slider to move back while ensuring that the slider can be pushed.

[0010] As a preferred technical solution of the utility model, a pressing column is fixedly connected to the rack, and the pressing column is slidably connected to one end of the fixed cylinder, so as to facilitate the pressing of the rack.

[0011] As a preferred technical solution of the utility model, a pair of clamps are arranged in a mirror image, and the clamps are in an arc-shaped structure, so as to facilitate clamping of cylindrical chalks.

[0012] As a preferred technical solution of the utility model, the fixing tube is in a cylindrical tube shape, and the end of the fixing tube close to the chalk is in a conical structure, so as to avoid friction between the fixing tube and the blackboard.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model provides a clamping block, a clamping plate and a fixing tube. The clamping block is pressed through the pressing groove to insert the chalk into the fixing tube. The clamping block is released. Under the push of the second spring, a pair of clamping blocks drives a pair of clamping plates to contact the chalk tightly, restricting the chalk from being separated, thereby fixing the chalk. In this way, direct contact between the hand and the chalk is avoided during the writing process, and the corrosion of the chalk on the hand is reduced.

[0015] 2. The utility model sets a tooth block and a rack, presses the pressing column, and the pressing column pushes the rack to move, thereby driving the tooth block to move downward, so that the slider moves downward for a distance, the resistance block enters the next resistance groove, and the slider pushes the chalk out for a distance, so that it is convenient to write again. By repeatedly pressing the pressing column, the chalk can be continuously pushed out, thereby facilitating the feeding of the chalk, and the feeding speed is fast. By pressing the push rod, the slider can be pulled to reset, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the slider part of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the splint part of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the rack part of the utility model;

[0020] Figure 5It is a structural schematic diagram of the tooth block part of the utility model;

[0021] Figure 6 It is a structural schematic diagram of the push rod part of the utility model.

[0022] In the figure: 1. fixed cylinder; 2. clamping mechanism; 21. pressing groove; 22. clamping block; 23. clamping plate; 24. sliding block; 25. contact groove; 26. contact block; 27. first spring; 28. second spring; 3. pushing mechanism; 31. pressing column; 32. rack; 33. third spring; 34. push rod; 35. tooth block; 36. fourth spring; 37. inclined groove; 4. chalk. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-6 , the utility model provides a technical solution of a chalk holder:

[0025] Embodiment 1:

[0026] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a chalk clamp comprises a fixed cylinder 1, a clamping mechanism 2 is connected to the fixed cylinder 1, the clamping mechanism 2 comprises a slider 24, the fixed cylinder 1 is slidably connected with the slider 24 inside, a pair of mirror-arranged clamping blocks 22 are rotatably connected to the slider 24, a clamping plate 23 is fixedly connected to the clamping block 22, a pair of the clamping plates 23 are mirror-arranged, and the clamping plate 23 is an arc-shaped structure, so as to facilitate the fixation of the chalk 4 firmly, a second spring 28 is installed between the pair of the clamping blocks 22, the interior of the fixed cylinder 1 is movably plugged with the chalk 4, a pair of the clamping plates 23 are in conflict with the outer wall of one end of the chalk 4, the outer wall of the fixed cylinder 1 is provided with a pressing groove 21 for pressing the clamping block 22, and a limiting spring 23 is connected to the slider 24. The free sliding resistance component of the block 24 comprises a resistance block 26, the resistance block 26 is slidably connected to the slider 24, a first spring 27 is installed between the resistance block 26 and the slider 24, a plurality of resistance grooves 25 are arranged on the inner wall of the fixed cylinder 1, the resistance block 26 extends into the resistance groove 25 through the first spring 27, thereby limiting the free sliding of the slider 24, the end of the resistance block 26 extending into the resistance groove 25 is in a hemispherical structure, and the plurality of resistance grooves 25 are arranged linearly, thereby ensuring that the slider can be pushed by the pushing mechanism 3, the fixed cylinder 1 is in a cylindrical tube shape, and the end of the fixed cylinder 1 close to the chalk 4 is in a conical structure, thereby facilitating the writing of the chalk 4 and avoiding friction between the fixed cylinder 1 and the blackboard.

[0027] When in use, the clamping block 22 is pressed by pressing the groove 21, and the chalk 4 is inserted into the interior of the fixed tube 1, so that the chalk 4 is located between the pair of clamping plates 23, and the clamping block 22 is released. Under the push of the second spring 28, the pair of clamping blocks 22 drive the pair of clamping plates 23 to approach each other, thereby tightly contacting the chalk 4, limiting the chalk 4 from being separated, and thus fixing the chalk 4. A larger gap is provided between the clamping block 22 and the slider 24, so that the pair of clamping blocks 22 can swing. At the same time, the first spring 27 pushes the abutting block 26 to extend into the abutting groove 25, thereby limiting the random sliding of the slider 24. When the chalk 4 is fixed, the chalk 4 can still be shaken by the clamping block 22. When the chalk 4 swings during writing, the chalk 4 uses the tail and the end of the fixed tube 1 as fulcrums, so that writing can be done on the blackboard, avoiding direct contact between the hand and the chalk 4, and reducing the corrosion of the chalk 4 on the hand.

[0028] Embodiment 2:

[0029] On the basis of the first embodiment, Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, when in use, the fixed cylinder 1 is connected with a pushing mechanism 3, and the pushing mechanism 3 includes a rack 32. The inner wall of the fixed cylinder 1 is slidably connected with the rack 32. A third spring 33 is installed between the rack 32 and the fixed cylinder 1. The slider 24 is slidably connected with a tooth block 35 that unidirectionally meshes with the rack 32. A fourth spring 36 is installed between the tooth block 35 and the slider 24. The outer wall of the tooth block 35 is provided with an oblique groove 37. The clamping block 22 is fixedly connected with a push rod 34 that contacts the inner wall of the oblique groove 37. The push rod 34 has an "L"-shaped structure, and one end of the push rod 34 that contacts the inner wall of the oblique groove 37 is in an inclined shape, so that the push rod 34 can push the tooth block 35 to disengage from the rack 32. A pressing column 31 is fixedly connected to the rack 32, and the pressing column 31 is slidably connected to one end of the fixed cylinder 1, thereby facilitating the pressing of the rack 32.

[0030] After the chalk 4 is installed, the rack 32 limits the tooth block 35 from moving away from the chalk 4, so that during the writing process, the chalk 4 contacts the blackboard, thereby transmitting force to the slider 24, and the slider 24 supports the chalk 4. When the leaked part of the chalk 4 is consumed, the pressing column 31 is pressed, and the pressing column 31 pushes the rack 32 to move, thereby driving the tooth block 35 to move downward, so that the slider 24 moves downward for a distance, and the contact block 26 enters the next contact groove 25. The slider 24 pushes the chalk 4 to extend a distance, so as to facilitate writing again, and the third spring 33 is compressed, and the pressing column 31 is released. The third spring 33 pushes the pressing column 31 to reset, and the rack 32 is unidirectionally meshed with the tooth block 35, so the rack 32 The fourth spring 36 is used to push the tooth block 35 to enter the slider 24, and the fourth spring 36 is compressed. The fourth spring 36 is used to push the tooth block 35 to maintain the meshing state with the rack 32. When the rack 32 passes over the tooth block 35, the slider 24 does not move back under the resistance of the resistance block 26, so that the chalk 4 can be continuously pushed out by repeatedly pressing the pressing column 31. When the push rod 34 is pressed, the push rod 34 drives the clamping block 22 to move, and the clamping block 22 causes the clamping plate 23 to release the chalk 4, so that the head of the chalk 4 can be pulled out, and the push rod 34 pushes the tooth block 35 upward through the inclined groove 37, so that the tooth block 35 is disengaged from the rack 32, and the slider 24 can be pulled back to reset it, and a new chalk 4 can be installed, which is convenient to operate.

[0031] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chalk holder, comprising a fixed cylinder (1), to which a clamping mechanism (2) is connected, characterized in that: The clamping mechanism (2) comprises a slider (24), the interior of the fixed cylinder (1) is slidably connected with the slider (24), a pair of mirror-arranged clamping blocks (22) are rotatably connected to the slider (24), a clamping plate (23) is fixedly connected to the clamping block (22), a second spring (28) is installed between the pair of clamping blocks (22), a chalk (4) is movably inserted into the interior of the fixed cylinder (1), the pair of clamping plates (23) abut against the outer wall of one end of the chalk (4), a pressing groove (21) for pressing the clamping block (22) is provided on the outer wall of the fixed cylinder (1), and an abutment component for limiting the free sliding of the slider (24) is connected to the slider (24); The fixed cylinder (1) is connected to a pushing mechanism (3), the pushing mechanism (3) comprising a rack (32), the inner wall of the fixed cylinder (1) is slidably connected to the rack (32), a third spring (33) is installed between the rack (32) and the fixed cylinder (1), a tooth block (35) unidirectionally meshing with the rack (32) is slidably connected to the slider (24), a fourth spring (36) is installed between the tooth block (35) and the slider (24), an outer wall of the tooth block (35) is provided with an oblique groove (37), and a push rod (34) abutting against the inner wall of the oblique groove (37) is fixedly connected to the clamping block (22).

2. A chalk holder according to claim 1, characterized in that: The resistance assembly comprises a resistance block (26), the resistance block (26) is slidably connected to the slider (24), a first spring (27) is installed between the resistance block (26) and the slider (24), the inner wall of the fixed cylinder (1) is provided with a plurality of resistance grooves (25), and the resistance block (26) extends into the interior of the resistance groove (25) through the first spring (27).

3. A chalk holder according to claim 1, characterized in that: The push rod (34) is in an "L"-shaped structure, and one end of the push rod (34) that contacts the inner wall of the inclined groove (37) is in an inclined surface shape.

4. A chalk holder according to claim 2, characterized in that: One end of the abutment block (26) extending into the abutment groove (25) is in a hemispherical structure, and a plurality of the abutment grooves (25) are arranged linearly.

5. A chalk holder according to claim 1, characterized in that: A pressing column (31) is fixedly connected to the rack (32), and the pressing column (31) is slidably connected to one end of the fixed cylinder (1).

6. A chalk holder according to claim 1, characterized in that: The pair of clamping plates (23) are arranged in a mirror image, and the clamping plates (23) are in an arc-shaped structure.

7. A chalk holder according to claim 1, characterized in that: The fixing tube (1) is in the shape of a cylindrical tube, and one end of the fixing tube (1) close to the chalk (4) is in a conical structure.

Images