CN2538565Y - Blackboard eraser - Google Patents

Abstract

The utility model relates to a blackboard eraser to erase chalk writing, which comprises a handheld box, a surface erasing box and a supporting shoe. Wherein, the surface erasing box is arranged in the handheld box. The supporting shoe is positioned between the handheld box and the surface erasing box and embedded into a duster cloth box. One surface of the supporting shoe is firmly connected with an inner surface of the handheld box and the other surface is provided with a plurality of convex bars. The convex bar can contact an inner erasing surface of the surface erasing box. The erasing surface is composed of two square straps and a plurality of cylindrical straps. Two square straps at both last ends are fixed. The supporting shoe and the surface erasing box realize relative sliding. Compared with prior arts, the utility model can effectively improve erasing effect and reduce flyash pollution during erasing.

Description

Blackboard brush

Technical field

The utility model relates to a kind of blackboard brush that is used for wiping chalk person's handwriting.

Background technology

Not only wiping effect is poor for brush type blackboard brush commonly used at present, and dust is flown upward everywhere; Rag type blackboard brush is also not ideal enough, when it is relatively cleaner, both easily cleans off a blackboard, be difficult for again producing dust, but how long have more than is needed, its surface will cover thick dust and can not clean off a blackboard, this just must constantly remove that surperficial dust, makes troubles to use.

Summary of the invention

The purpose of this utility model is to provide a kind of blackboard brush that produces dust pollution can improve wiping effect and reduce wiping the time.

Blackboard brush is mainly formed by holding box, brush finish box and back-up block, described brush finish box is positioned at holds box, described back-up block is being held between box and the brush finish box, and be embedded in the brush finish box, the one side of described back-up block with hold the box inner surface and fixedly connected, another side has several and protrudes bar, and the brush finish of described brush finish box is made up of several cloths, and described back-up block can slide relatively with the brush finish box.

Cloth in the middle of this blackboard brush brush finish is preferably cylindrical, and can be of both sides is square.

This blackboard brush in use, the protrusion bar of back-up block contacts with the cylindrical cloth of brush finish box and frictionally, the adhesive force of saying so exactly, (the componental movement position is such to drive the motion of brush finish box, when back-up block is not the two ends that are in the brush finish box, then to any end motion, or be in an end of brush finish box when back-up block, then when the other end moves), at this moment, blackboard also has a frictional force effect to cylindric cloth, and back-up block and blackboard all are that cylindric cloth is rotated to same direction to the frictional force moment of cloth, so, in use, cylindric cloth just can rotate to some extent, brings the part chalk dust into the rag box along the slit between cloth simultaneously, thereby make the rag bar all cleaner for a long time, and reduce generation dust when erasing the board.Simultaneously, the square rag bar on the both sides of brush finish box should be fixed with the brush finish box, and it can not be rotated as far as possible, and this not only can prevent flour dust overflow in the box, and produces dust can also reduce grooming the time.Because when blackboard brush during to left movement, cloth has produced a torsional moment under the effect of blackboard and back-up block, and then when moving right, cloth under the secondary action again of torsional moment and blackboard and back-up block with backward rotation, if leftmost cloth is unfixing, it also will rotate and take up dust and rotate, dust is dispersed, this just is equivalent to add a rag bar again to stop dust on the leftmost rag bar left side, in like manner, the blackboard brush that can push away moves right and then to the situation of left movement.In addition, in use, the concavo-convex structure of back-up block also has one " beaing " effect to cloth, and like this, brush finish just can be in cleaner state always, thereby reaches comparatively desirable cleaning effect for a long time.

The mid portion of every cylindrical cloth should have certain rigidity on the brush finish box, be out of shape to prevent it as far as possible, and the cloth at two ends should be softer, and this is for it can be rotated with comparalive ease.The two ends of back-up block protrusion bar should be short slightly, so that make main pressure concentrate on the middle part of rag bar, so that the rag bar can be rotated with comparalive ease; The outstanding bar on back-up block both sides also should be short slightly, and this is in order to prevent that dust is deposited in the brush finish that can not rotate on both sides, if piled up dust in the brush finish, that will make the blackboard of cleaning be stained with dust again, has also just reduced wiping effect.

Hold box and strengthen the dust shield effectiveness in addition, reduce the effect of the diffusion of dust, hold the most handy transparent material of box and make, and increase an active window, what of dust in the observation box get rid of dust simultaneously from active window so easily.

The utility model produces dust pollution when compared with prior art, can improve wiping effect effectively and reduce wiping.

Description of drawings

Fig. 1 is the profile of the utility model blackboard brush

The specific embodiment

Referring to Fig. 1, a kind of blackboard brush, form by holding box 1, brush finish box 2 and back-up block 3, described brush finish box 2 is positioned at holds box 1, described back-up block 3 is being held between box 1 and the brush finish box 2, and is embedded in the brush finish box 2, its one side with hold box 1 inner surface and fixedly connected, another side has several and protrudes bar 5, and the protrusion bar on both sides is preferably short slightly.Described brush finish is made up of several cloths 4, and middle is cylindric cloth, both sides be preferably square cloth.The square cloth at two ends preferably is fixed, and can slide relatively between described back-up block 3 and the brush finish box 2, and like this, back-up block just can play the effect of " beaing " cloth.

Claims (3)

1 one kinds of blackboard brush, form by holding box (1), brush finish box (2) and back-up block (3), described back-up block (3) is positioned to be held between box (1) and the brush finish box (2), and be embedded in the brush finish box, the one side of described back-up block (3) with hold box (1) inner surface and fixedly connected, another side has several and protrudes bar (5), and the brush finish of described brush finish box is made up of several cloths (4), and described back-up block (3) can slide relatively with brush finish box (2).

2 blackboard brush as claimed in claim 1 is characterized in that, the protrusion bar on both sides is short slightly on the back-up block (3).

3 blackboard brush as claimed in claim 1 is characterized in that, middle cloth is cylindrical, both sides be square.

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