CN201371653Y - Chalk sleeve - Google Patents

Abstract

The utility model discloses a chalk cover, which comprises a sleeve and a propulsion device. A clamping head is installed at the head end of the sleeve, and the clamping head is in the shape of a conical claw. The device includes a propelling rod passing through the end of the sleeve. The propelling rod is provided with threads, and its inner end is provided with a push plate. A top spring is set on the propelling rod at the inner part of the sleeve, and a knob is screwed on the exposed part. The sleeve End outer ring features fur wipes. The utility model fixes the chalk firmly, and the volume of the sleeve is small, which is convenient for writing; the end of the sleeve is provided with a brush, which can be wiped off at any time when writing errors occur, which is convenient to use and saves time.

Description

a chalk set

technical field

The utility model belongs to the technical field of teaching chalk utensils, in particular to a chalk external clamping tool.

Background technique

Chalk is a general writing utensil in school teaching. During use, the hand is in direct contact with the chalk. Every time a class is finished, the teacher usually has chalk dust on his hands. When sweating, the chalk dust sticks to the hands and is more difficult to remove, which is unhygienic. For solving this problem, people have designed multiple utensils that can clamp chalk, but ubiquitous volume is big, heavier, writing is inconvenient, chalk advances the disadvantages such as not smooth. Moreover, the existing chalk cover has a single function and can only be used to hold the chalk. When a small error occurs in the writing, it can only be erased with a blackboard eraser, which wastes time.

Contents of the invention

The technical problem to be solved by the utility model is to provide a small volume, easy to use chalk case with an erasing device.

In order to solve the above-mentioned technical problems, the utility model includes a sleeve and a propulsion device. Its structural feature is that a clamping head is installed at the head end of the sleeve, and the clamping head is in the shape of a cone claw. , the propulsion device includes a propulsion rod passing through the end of the sleeve, the propelling rod is provided with a thread, and its inner end is provided with a push plate, a top spring is set on the propelling rod in the inner part of the sleeve, and a knob is screwed on the exposed part , The outer ring at the end of the sleeve is provided with a brush.

The sleeve and the clamping head are threadedly connected, and the axial section of the push rod is in a "T" shape.

The hair brush is cylindrical.

The beneficial effects of the utility model are: because the clamping head is in the shape of a cone claw, the chalk is fixed by the clamping head, the sleeve and the clamping head are closely combined, the volume is small, and it is convenient for writing; the propulsion device is provided with a screw rod and a knob, and the chalk is pushed smoothly Convenient; there is a brush at the end of the sleeve, when there is a writing error, you can use the brush to erase it at any time, saving time.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a side view of the utility model.

Among the figure: 1, sleeve, 2, clamping head, 3, propulsion rod, 4, knob, 5, screw thread, 6, top spring, 7, brush, 8, chalk.

Detailed ways

As shown in Figures 1 to 2, it includes a sleeve 1 and a propulsion device. A clamping head 2 is installed at the head end of the sleeve 1. The clamping head 2 is in the shape of a tapered claw. The sleeve 1 and the clamping head 2 are screwed together. The above-mentioned propulsion device is arranged at the end of the sleeve 1, and the propulsion device includes a propulsion rod 3 passing through the end of the sleeve 1. There is a push plate at the end, and a top spring 6 is set on the push rod 3 in the inner section of the sleeve 1. The top spring 6 is located between the push plate and the end wall of the sleeve 1. The exposed section is screwed with a knob 4, and the sleeve 1 The outer ring of the end is provided with a brush 7, which is in the shape of a cylinder, and is tightly sleeved on the outside of the sleeve 1.

During use, the chalk 8 is arranged in the sleeve, one end of which is connected with the propulsion rod 3, and the other end is connected with the clamping head 2, and the exposed length of the chalk 8 can be adjusted conveniently by rotating the knob 4, which is convenient to use.

Claims (3)

1, a kind of chalk cover, comprise sleeve (1) and propulsion device, it is characterized in that sleeve (1) head end is equipped with clamping head (2), and this clamping head (2) is cone claw shape, described The propelling device is located at the end of the sleeve (1), the propelling device includes a propelling rod (3) passing through the end of the sleeve (1), the propelling rod (3) is provided with a thread (5), and its inner end is provided with The push plate is set with a top spring (6) on the push rod (3) of the inner section of the sleeve (1), the exposed section is screwed with a knob (4), and the outer ring of the end of the sleeve (1) is provided with a brush ( 7). 2. The chalk set according to claim 1, characterized in that the sleeve (1) and the clamping head (2) are threadedly connected, and the axial section of the push rod (3) is "T" shaped. 3. The chalk case according to claim 1, characterized in that the brush (7) is cylindrical.

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