Double-drum cloth rolling tension spring type blackboard eraser

Abstract

The utility model discloses a double-cylinder cloth rolling tension spring type blackboard eraser, which comprises a first cylinder body, a second cylinder body, a tension spring and a strip wiping rag, the cross section of the first cylinder body is circular, the cross section of the second cylinder body is circular, or the shape of the combination of a plurality of circles, protruding columns are arranged at the center positions of the two ends of the first barrel and the center positions of the two ends of the second barrel, the protruding columns at the same ends of the first barrel and the second barrel are connected through a tension spring, the two ends of the long-strip-shaped wiping cloth are wound around the first barrel and the second barrel respectively, and under the tension effect of the tension spring, the two barrels are attached to each other and clamp the long-strip-shaped wiping cloth. According to the blackboard eraser, when rolled cloth is wound, only one barrel body needs to rotate along the surface of the other barrel body, the tension spring does not need to be drastically pulled for multiple times, overall operation is convenient and smooth, fatigue deformation of the tension spring is reduced, flying dust can be reduced, and health is guaranteed; the blackboard eraser is convenient to disassemble and clean, simple in structure, long in service life, low in production cost and beneficial to market popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to teaching aid technical field, concretely relates to a double cylinder cloth winding pull spring formula blackboard eraser. BACKGROUND

[0002] The current market blackboard eraser is usually fixed with a piece of cloth on the board, and the cloth is padded with sponge below, however, the blackboard eraser with only one layer of cloth will adsorb a large amount of dust in the board after several uses, which is difficult to remove, and when used again, it not only cannot clean the blackboard thoroughly, but also causes the powder to fly and be inhaled into the lungs, which has a negative impact on the health of teachers and students, and if disposable blackboard cloth is used, it will cause a large amount of material waste and have adverse effects on the environment, and the way of spraying water to moisten the cloth is also not desirable, because the moistened cloth will leave powder when wiping the blackboard, so that there is a layer of chalk dust on the blackboard, affecting the clarity of writing.

[0003] The applicant has previously developed a new type of blackboard eraser (application number: 202323666392.9, application date: December 29, 2023), which adopts a two-plate cloth winding pull spring structure, which can prolong the single use time and help reduce the flying of dust that has been adhered by continuously changing the winding of the cloth during use, and can be disassembled and cleaned, which solves the defects of traditional blackboard erasers. However, the blackboard eraser has the following defects in the process of use and promotion: (1) when changing the winding of the cloth, a certain force is needed to separate the two plate bodies, and the position of the sliding block in the sliding slot also needs to be adjusted, and the pull spring needs to be pulled many times, which is not convenient to operate, and repeated pulling will also cause the pull spring to be tired and become loose and weak, and lose the fixing effect; (2) dust is easily accumulated in the sliding slot during use, which affects the sliding of the sliding block, and thus affects the smoothness of the cloth winding; (3) the structure is relatively complex, the production cost is high, and it is not conducive to market promotion. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a double cylinder cloth winding pull spring formula blackboard eraser, which solves the defects of the existing two-plate cloth winding pull spring formula blackboard eraser, such as inconvenient operation, pull spring fatigue, poor smoothness of cloth winding, complex structure, high production cost, etc.

[0005] The utility model realizes the above-mentioned purpose through the following technical solutions:

[0006] The utility model provides a double cylinder cloth winding spring type blackboard eraser, the blackboard eraser includes first cylinder, second cylinder, pull spring and long strip cloth, the cross section of first cylinder is round, the cross section of second cylinder is round or the shape of a plurality of round shapes, the protruding post of both ends of first cylinder and second cylinder is equipped with the center position, and the protruding post of the same end of first cylinder and second cylinder is connected through pull spring, and the both ends of long strip cloth are wound on first cylinder and second cylinder respectively, and under the action of the pulling force of pull spring, two cylinders mutually adhere and hold long strip cloth.

[0007] Further improvement lies in that when the cross section of the second cylinder is round, the cross sectional areas of the first cylinder and the second cylinder are equal.

[0008] Further improvement lies in that when the cross section of the second cylinder is the shape of a plurality of round shapes, the round shapes are integrally formed by intersecting or connecting blocks.

[0009] Further improvement lies in that when the cross section of the second cylinder is the shape of a plurality of round shapes, the second cylinder is formed with a plurality of recesses for accommodating the first cylinder.

[0010] Further improvement lies in that the surfaces of the first cylinder and the second cylinder and the both ends of the long strip cloth are provided with detachable fixing members for fixing the both ends of the long strip cloth on the surfaces of the first cylinder and the second cylinder.

[0011] Further improvement lies in that the front and back surfaces of the long strip cloth are provided with stripes.

[0012] The blackboard eraser only needs to rotate one cylinder along the surface of the other cylinder when winding the cloth, without the need to pull the pull spring for many times and by a large amplitude, so that the overall operation is convenient and smooth, the fatigue deformation of the pull spring is reduced, dust flying is also reduced, health is ensured, the blackboard eraser is convenient to disassemble and clean, has simple structure, long service life and low production cost, and is favorable for market promotion. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an overall three-dimensional schematic view of the utility model embodiment 1;

[0014] Figure 2 It is a three-dimensional schematic view of the utility model embodiment 1 after removing the long strip cloth;

[0015] Figure 3 It is an end schematic view of the utility model embodiment 1 after removing the long strip cloth;

[0016] Figure 4 It is an end schematic view of the utility model embodiment 2 after removing the long strip cloth;

[0017] Figure 5 Figure 3 is a schematic view of the end part of the long wiping cloth removed by the embodiment 3 of the present application;

[0018] In the figure: 1, first cylinder; 2, second cylinder; 3, tension spring; 4, long wiping cloth; 5, convex column; 6, concave part; 7, detachable fixing part. DETAILED DESCRIPTION

[0019] It is necessary to point out here that the following detailed description is only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application, and the skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0020] Embodiment 1

[0021] In combination Figures 1-3 As shown in the figure, a double-cylinder wiping cloth tension spring type blackboard eraser, the blackboard eraser comprises a first cylinder 1, a second cylinder 2, a tension spring 3 and a long wiping cloth 4, the cross section of the first cylinder 1 is circular, the cross section of the second cylinder 2 is circular, and the cross-sectional areas of the first cylinder 1 and the second cylinder 2 are equal, the central positions of the two ends of the first cylinder 1 and the second cylinder 2 are provided with convex columns 5, the convex columns 5 can be integrally formed with the cylinders, or connected by screwing, inserting and the like, the convex columns 5 at the same end of the first cylinder 1 and the second cylinder 2 are connected by the tension spring 3, the two ends of the long wiping cloth 4 are wound around the first cylinder 1 and the second cylinder 2 respectively, and under the action of the tension of the tension spring 3, the two cylinders are mutually adhered and clamp the long wiping cloth 4.

[0022] Among them, the first cylinder 1 and the second cylinder 2 are selected from light materials with certain hardness, such as plastic, wood, rubber and the like. The long wiping cloth 4 can be selected from cloth with good dust absorption effect, for example, cotton cloth with a large number of gaps, so that the dust adsorbed is not easy to raise, in addition, the front and back surfaces of the long wiping cloth 4 are provided with stripes to increase the wiping effect, the two ends of the long wiping cloth 4 are fixed on the first cylinder 1 and the second cylinder 2, and in the initial state, the main body of the long wiping cloth 4 can be concentratedly wound on one of the cylinders, for example, the second cylinder 2. In use, the straight long wiping cloth 4 (i.e. the upper middle position) between the first cylinder 1 and the second cylinder 2 serves as a use surface to wipe the blackboard, when it is full of dust, the tension spring 3 can be slightly stretched, and the first cylinder 1 is rotated to rotate along the surface of the second cylinder 2, and the long wiping cloth 4 is wound while rotating, the second cylinder 2 synchronously releases the long wiping cloth 4, so that the dust-adsorbed part is transferred to the surface of the first cylinder 1, and the clean long wiping cloth 4 is transferred between the first cylinder 1 and the second cylinder 2. When the entire long wiping cloth 4 is full of dust, it can be taken down, cleaned and dried to be reused. Usually, one blackboard eraser can be equipped with multiple long wiping cloths 4 for cyclic use. Figure 1 ​

[0023] Preferably, the surfaces of the first cylinder 1 and the second cylinder 2 and the two ends of the long cloth 4 are provided with detachable fixing members 7 for fixing the two ends of the long cloth 4 on the surfaces of the first cylinder 1 and the second cylinder 2. The detachable fixing members 7 can be magic tapes, magnetic pieces or the like.

[0024] Embodiment 2

[0025] Further combination Figure 4 As shown in the figure, a double-cylinder cloth-winding spring-type blackboard eraser includes a first cylinder 1, a second cylinder 2, a spring 3 and a long cloth 4. The cross section of the first cylinder 1 is circular, the cross section of the second cylinder 2 is the shape of two circles combined, and the two circles are integrally formed by a connecting block. The surface of the second cylinder 2 is formed with two recesses 6 for accommodating the first cylinder 1. The central positions of the two ends of the first cylinder 1 and the second cylinder 2 are provided with protruding columns 5. The protruding columns 5 of the same end of the first cylinder 1 and the second cylinder 2 are connected by the spring 3. The two ends of the long cloth 4 are wound around the first cylinder 1 and the second cylinder 2 respectively. Under the action of the tension of the spring 3, the two cylinders are in close contact with each other and hold the long cloth 4.

[0026] The use method of this embodiment is similar to that of Embodiment 1. However, the surface of the second cylinder 2 is formed with two recesses 6 for accommodating the first cylinder 1. When in use, the side edges corresponding to the recesses 6 without accommodating the first cylinder 1 are used as the right side in the figure. When replacing the cloth each time, the first cylinder 1 is rotated by a specific angle so as to fall into the other recess 6. In this way, the stability when the spring 3 is tensioned can be increased. Figure 4

[0027] Embodiment 3

[0028] Further combination Figure 5 As shown in the figure, a double-cylinder cloth-winding spring-type blackboard eraser includes a first cylinder 1, a second cylinder 2, a spring 3 and a long cloth 4. The cross section of the first cylinder 1 is circular, the cross section of the second cylinder 2 is the shape of four circles combined, and the four circles are integrally formed by intersections. The surface of the second cylinder 2 is formed with four recesses 6 for accommodating the first cylinder 1. The central positions of the two ends of the first cylinder 1 and the second cylinder 2 are provided with protruding columns 5. The protruding columns 5 of the same end of the first cylinder 1 and the second cylinder 2 are connected by the spring 3. The two ends of the long cloth 4 are wound around the first cylinder 1 and the second cylinder 2 respectively. Under the action of the tension of the spring 3, the two cylinders are in close contact with each other and hold the long cloth 4. The use method of this embodiment is similar to that of Embodiment 2. The side edges corresponding to the recesses 6 without accommodating the first cylinder 1 are used as the upper, lower and right sides in the figure. Figure 5

[0029] ​​The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A dual cylinder cloth pulling spring type blackboard eraser, characterized in that, The blackboard eraser comprises a first cylinder (1), a second cylinder (2), a tension spring (3) and a long strip eraser (4), the cross section of the first cylinder (1) is circular, the cross section of the second cylinder (2) is circular or a plurality of circular shapes combined, the center of the two ends of the first cylinder (1) and the second cylinder (2) is provided with a convex column (5), and the convex columns (5) of the same end of the first cylinder (1) and the second cylinder (2) are connected by the tension spring (3), the two ends of the long strip eraser (4) are wound on the first cylinder (1) and the second cylinder (2) respectively, and under the action of the tension of the tension spring (3), the two cylinders are adhered to each other and clamp the long strip eraser (4).

2. A dual cylinder cloth roller spring type blackboard eraser according to claim 1, wherein When the cross section of the second cylinder (2) is circular, the cross sectional areas of the first cylinder (1) and the second cylinder (2) are equal.

3. A dual cylinder cloth roller spring type blackboard eraser according to claim 1, wherein When the cross section of the second cylinder (2) is a plurality of circular shapes combined, the circular shapes are integrally formed by intersecting or connecting blocks.

4. A dual cylinder cloth roller spring type blackboard eraser according to claim 1, wherein When the cross section of the second cylinder (2) is a plurality of circular shapes combined, the surface of the second cylinder (2) is formed with a plurality of recesses (6) for accommodating the first cylinder (1).

5. A dual cylinder cloth roller spring type blackboard eraser according to claim 1, wherein The surface of the first cylinder (1) and the second cylinder (2) and the two ends of the long strip eraser (4) are provided with detachable fixing members (7) for fixing the two ends of the long strip eraser (4) on the surface of the first cylinder (1) and the second cylinder (2).

6. A dual cylinder cloth roller spring chalkboard eraser according to claim 1, wherein, The front and back of the long strip eraser (4) are provided with stripes.

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