Chalk clamp

Abstract

The utility model discloses a chalk clamp which comprises an inner barrel used for installing chalk, the front end of the inner barrel is provided with an opening, the front end of the inner barrel is provided with a plurality of elastic clamping pieces, the outer side of the inner barrel is sleeved with a locking outer barrel, the locking outer barrel is arranged in a front-back moving mode relative to the inner barrel, and the front side of the locking outer barrel is provided with a conical barrel used for pressing the elastic clamping pieces. The elastic clamping pieces are provided with inclined tables matched with the conical barrels, a shifting wheel is rotationally arranged between the two elastic clamping pieces, and the shifting wheel makes contact with the surface of the chalk. When the extension length of the chalk needs to be adjusted, the locking outer barrel is firstly far away from the elastic clamping piece, so that the conical barrel is separated from the inclined table. After the chalk is separated from the elastic clamping piece, the elastic clamping piece is separated from the chalk, in the state, the chalk can stretch out forwards relative to the inner barrel, at the moment, the thumb pokes the poking wheel, the poking wheel rubs against the surface of the chalk to drive the chalk to move forwards, the stretching length of the chalk can be accurately controlled, and a user can have better writing experience when using the chalk.

Description

Technical Field

[0001] The utility model relates to a chalk clip. Background Art

[0002] Prior art, such as the Chinese utility model patent document, with the publication number CN2336972Y, discloses a chalk clamp. In one embodiment of the prior art, it is disclosed that the clamping principle is to rotate the outer cylinder, and rely on the force generated by the rear end thread to compress the conical part and clamp the chalk. When adjusting the extension length of the chalk, just rotate the outer cylinder in the reverse direction to relax the conical part, the chalk is loosened and automatically extends under the action of the compression spring. After adjusting the extension length of the chalk, rotate the outer cylinder forward again, rely on the force generated by the rear thread to compress the conical part, and the chalk is clamped again.

[0003] In the prior art, the outer cylinder is rotated in the reverse direction to relax the conical part, the chalk is loosened, and the chalk automatically extends out under the action of the compression spring. The technical problem with this structure is that the compression spring drives the chalk to extend, and since the compression spring releases the stored force in an instant, the length of the chalk extension cannot be controlled. When the length of the chalk extension is greater than the required length, the user needs to press the excess chalk back, which is inconvenient. Therefore, there is an urgent need for a chalk clamp that can easily adjust the length of the chalk extension to solve the existing problem. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a chalk clamp which is convenient for adjusting the extension length of the chalk.

[0005] A chalk clip designed for this purpose comprises an inner cylinder for mounting chalk, the front end of the inner cylinder is open, a plurality of elastic clips are arranged at the front end of the inner cylinder, a locking outer cylinder is sleeved on the outer side of the inner cylinder, the locking outer cylinder is arranged to move forward and backward relative to the inner cylinder, a conical cylinder for pressing the elastic clips is arranged on the front side of the locking outer cylinder, an inclined platform cooperating with the conical cylinder is arranged on the elastic clips, a thumbwheel is rotatably arranged between the two elastic clips, and the thumbwheel contacts the surface of the chalk.

[0006] Preferably, raised portions are evenly distributed on the surface of the thumbwheel along its circumference.

[0007] Preferably, a positioning block which can be inserted between two elastic clips is provided on the cone.

[0008] Preferably, anti-slip textures are provided on the outer wall of the locking outer cylinder and on the outer wall of the inner cylinder behind the locking outer cylinder.

[0009] Preferably, the locking outer cylinder is threadedly connected to the inner cylinder.

[0010] Compared with the prior art, the utility model has a dial wheel rotatably arranged between the two elastic clips, and the dial wheel contacts the surface of the chalk. When the length of the chalk extension needs to be adjusted, the locking outer cylinder is first moved away from the elastic clip to separate the cone cylinder from the ramp. After the two are separated, the elastic clip is separated from the chalk. In this state, the chalk can be extended forward relative to the inner cylinder. At this time, the thumb is used to turn the dial wheel, and the friction between the dial wheel and the surface of the chalk drives the chalk to move forward, so that the length of the chalk extension can be accurately controlled, so that the user has a better writing experience when using it. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0013] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] See also Figure 1-Figure 3 A chalk clip comprises an inner cylinder 10 for mounting chalk 40, the front end of the inner cylinder 10 being open, a plurality of elastic clips 120 being arranged at the front end of the inner cylinder 10, a locking outer cylinder 210 being sleeved on the outer side of the inner cylinder 10, the locking outer cylinder 210 being arranged to move forward and backward relative to the inner cylinder 10, a conical cylinder 220 for pressing the elastic clips 120 being arranged at the front side of the locking outer cylinder 210, an inclined platform 130 cooperating with the conical cylinder 220 being arranged on the elastic clips 120, a dial wheel 30 being rotatably arranged between the two elastic clips 120, and the dial wheel 30 being in contact with the surface of the chalk 40.

[0016] Based on the above embodiment, when the length of the chalk needs to be adjusted, the locking outer cylinder is first moved away from the elastic clip to separate the cone cylinder from the inclined platform. After the two are separated, the elastic clip is separated from the chalk. In this state, the chalk can be extended forward relative to the inner cylinder. At this time, the thumb turns the dial, and the friction between the dial and the surface of the chalk drives the chalk forward, so that the length of the chalk can be accurately controlled, so that the user has a better writing experience when using it.

[0017] See also Figure 2 , protrusions 310 are evenly arranged on the surface of the thumbwheel 30 along its circumference. The protrusions 310 can increase the friction between the thumb and the thumbwheel during the dialing process, and can also increase the friction between the thumbwheel and the chalk.

[0018] See also Figure 2 A positioning block 230 that can be inserted between the two elastic clips 120 is provided on the cone 220. The function of the positioning block 230 is that when the cone 220 and the ramp 130 fit together to force the elastic clips 120 to press the chalk, the positioning block 230 is stuck between the two elastic clips 120, which can prevent the locking outer cylinder 210 from rotating at will.

[0019] In the present invention, anti-slip textures 110 are provided on the outer wall of the locking outer cylinder 210 and on the outer wall of the inner cylinder 10 behind the locking outer cylinder 210 .

[0020] In the present invention, the locking outer cylinder 210 is threadedly connected to the inner cylinder 10 .

[0021] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0023] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A chalk clip, comprising an inner cylinder (10) for mounting chalk (40), the front end of the inner cylinder (10) being open, a plurality of elastic clips (120) being arranged at the front end of the inner cylinder (10), a locking outer cylinder (210) being sleeved on the outer side of the inner cylinder (10), the locking outer cylinder (210) being arranged to move forward and backward relative to the inner cylinder (10), a conical cylinder (220) for pressing the elastic clip (120) being arranged at the front side of the locking outer cylinder (210), the elastic clip (120) being provided with an inclined platform (130) cooperating with the conical cylinder (220), characterized in that: A thumbwheel (30) is rotatably arranged between the two elastic clips (120), and the thumbwheel (30) is in contact with the surface of the chalk (40).

2. A chalk clip according to claim 1, characterized in that: Protrusions (310) are evenly distributed on the surface of the thumbwheel (30) along its circumference.

3. A chalk clip according to claim 1, characterized in that: The cone (220) is provided with a positioning block (230) which can be inserted between the two elastic clips (120).

4. A chalk clip according to claim 1, characterized in that: Anti-slip textures (110) are provided on the outer wall of the locking outer cylinder (210) and on the outer wall of the inner cylinder (10) behind the locking outer cylinder (210).

5. A chalk clip according to claim 1, characterized in that: The locking outer cylinder (210) is threadedly connected to the inner cylinder (10).

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