CN205344259U - Blackboard eraser - Google Patents

Abstract

The utility model provides a blackboard eraser, including the long banding blackboard eraser body, the blackboard eraser position is above the blackboard face, the length of the blackboard eraser body is unanimous with the width of blackboard face, the blackboard eraser body coupling has the guide rail, the length direction of guide rail is unanimous with the length direction of the blackboard eraser body, the guide rail is through pivot and crank connection dead axle, articulate one end connects on the dead axle with rotatable mode and connected to the fence should be held to the articulate, the pivot is connected to the articulate other end, the guide rail horizontal slip is followed to the pivot cover on the guide rail, the one end of baffle coupling spring, the other end of spring is the stiff end, the both ends of the blackboard eraser body are provided with the gyro wheel, the both sides of blackboard face are provided with the slide rail, the gyro wheel slides from top to bottom at the slide rail, the utility model discloses not only can make the user keep away from the chalk dust, not need the drive of electric energy in addition, lean on the effect of gravity to realize blacking the board entirely, have the characteristics of environmental protection and energy saving.

Description

a blackboard eraser

technical field

The utility model belongs to the technical field of teaching supplies, in particular to a blackboard eraser.

Background technique

At present, most of the blackboards in schools are manually wiped clean with simple blackboard erasers, so that the chalk dust easily falls on the person who wipes the blackboard and affects their health. There are erasers for long-distance erasing, which are controlled by electricity, which is not only costly, but also consumes electricity, which is not suitable for schools.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a blackboard eraser, which can prevent dust from falling on the human body.

In order to achieve the above object, the technical solution adopted by the utility model is:

A blackboard eraser, comprising a strip-shaped eraser body 7, the eraser body 7 is located above the board surface 10 of the blackboard, the length of the eraser body 7 is consistent with the width of the board surface 10 of the blackboard, the eraser body 7 is connected with a guide rail 6, and the length of the guide rail 6 is The direction is consistent with the length direction of the eraser body 7, the guide rail 6 is connected to the fixed shaft 3 by the rotating shaft 5 and the crank 4, and one end of the crank 4 is connected to the fixed shaft 3 in a rotatable manner and this end of the crank 4 is connected to the baffle plate 2, and the crank 4 The other end of the rotating shaft 5 is connected to the rotating shaft 5, the rotating shaft 5 is set on the guide rail 6 and slides left and right along the guide rail 6, the baffle plate 2 is connected to one end of the spring 1, the other end of the spring 1 is a fixed end, the two ends of the eraser body 7 are provided with rollers 9, blackboard Both sides of the board surface 10 are provided with slide rails 8 , and the rollers 9 slide up and down on the slide rails 8 .

A tray 12 is connected under the baffle plate 2, and a weight 11 is arranged in the tray 12.

The guide rail 6 is an arc guide rail, and its protrusion direction is upward.

Compared with the prior art, the utility model can not only keep users away from chalk dust, but also does not need to be driven by electric energy, and realizes wiping the blackboard entirely by the action of gravity, which has the characteristics of environmental protection and energy saving.

Description of drawings

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

Fig. 2 is a structural schematic diagram of the utility model crank.

Fig. 3 is a schematic diagram of the cooperative structure of the baffle plate and the weight of the utility model.

detailed description

The implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and examples.

As shown in Fig. 1, Fig. 2 and Fig. 3, a blackboard eraser comprises a strip-shaped eraser body 7, the eraser body 7 is located above the board surface 10 of the blackboard, and the length of the eraser body 7 is consistent with the width of the board surface 10 of the blackboard, The eraser body 7 is connected with a guide rail 6, the length direction of the guide rail 6 is consistent with the length direction of the eraser body 7, the guide rail 6 is connected to the fixed shaft 3 through the rotating shaft 5 and the crank 4, and one end of the crank 4 is connected to the fixed shaft 3 in a rotatable manner. This end of 4 is connected with baffle plate 2, and baffle plate 2 and crank 4 are an integral body, and can rotate to a certain extent around fixed axis 3. The other end of crank 4 connects rotating shaft 5, and rotating shaft 5 is sleeved on guide rail 6 and slides left and right along guide rail 6, and 6 is arc guide rail, and its protruding direction is upward. Baffle plate 2 connects the lower end of spring 1, and the upper end of spring 1 is fixed end, and the two ends of eraser body 7 are provided with roller 9, and the both sides of blackboard plate surface 10 are provided with slide rail 8, and roller 9 slides up and down on slide rail 8.

When there is no need to wipe the blackboard, the spring 1 is in a compressed state, and the eraser body 7 is lifted to the upper edge of the blackboard surface 10 by the baffle plate 2, the crank 4 and the rotating shaft 5.

When the blackboard needs to be wiped, the spring 1 is unclamped, and the rollers 9 at both ends slide down along the slide rail 8 due to gravity, and the rotating shaft 3 is fixed so that the eraser body 7 rotates around the fixed axis 3 through the crank 4, The rotating shaft 5 can move back and forth on the guide rail 6. During the sliding process of the blackboard eraser body 7, the purpose of wiping the blackboard is achieved by friction with the blackboard board surface 10. Like this, as long as spring 1 is unclamped when needing to wipe blackboard, blackboard eraser body 7 just can wipe blackboard automatically, makes people stay away from blackboard board surface 10, stays away from chalk dust.

In the utility model, since the length and curvature of the crank 4 are fixed, when the crank 4 drives the eraser body 7 to move up and down, the rotating shaft 5 must be realized by moving the guide rail 6 left and right, otherwise the eraser body 7 moves downward. After moving a short distance, it will be stuck by the owner, and cannot be moved to the lower edge of the blackboard panel 10. For example, when there is no need to wipe the blackboard, the position of the rotating shaft 5 is in the middle of the guide rail 6; In the middle position, it should move a small distance to the left around the guide rail 6. Because the length curvature of the crank 4 is fixed, otherwise the blackboard eraser body 7 will be stuck in a certain position in the middle of the blackboard surface 10 .

With reference to Fig. 3, in the utility model, a tray 12 is connected under the baffle plate 2 through a steel wire, and the tray 12 is equipped with a weight 11, such as an iron ingot.

When not needing to wipe blackboard, put into heavy object 11 in tray 12, make blackboard eraser body 7 can be mentioned, at this moment, spring 1 is in stretched state, and blackboard eraser body 7 is mentioned to the upper edge of blackboard board surface 10.

When the blackboard needs to be wiped, the weight 11 is taken out, and the eraser body 7 is out of balance due to the loss of weight, and under the action of gravity, it slides downward and rubs against the blackboard surface 10, thereby realizing the purpose of wiping the blackboard.

After the blackboard has been wiped, the weight 11 is put into the tray 12 again, and the eraser body 7 can be lifted. In order to prevent the eraser body 7 from returning to a balanced state, the speed is too large, and the spring 1 can be added to lower the eraser body 7. The speed during the position, thereby avoiding the phenomenon of being thrown out from the slide rail 8.

Claims (3)

1. a blackboard eraser, comprising a strip-shaped eraser body (7), the eraser body (7) is positioned above the blackboard surface (10), and the length of the eraser body (7) is consistent with the width of the blackboard surface (10), It is characterized in that the eraser body (7) is connected with a guide rail (6), the length direction of the guide rail (6) is consistent with the length direction of the eraser body (7), and the guide rail (6) is connected and fixed by the rotating shaft (5) and the crank (4). Axle (3), one end of crank (4) is connected on the fixed shaft (3) in a rotatable manner and this end of crank (4) is connected with baffle plate (2), and the other end of crank (4) is connected with rotating shaft (5) , the rotating shaft (5) is sleeved on the guide rail (6) and slides left and right along the guide rail (6), the baffle plate (2) is connected to one end of the spring (1), the other end of the spring (1) is a fixed end, the eraser body (7) Both ends are provided with rollers (9), and both sides of the blackboard surface (10) are provided with slide rails (8), and the rollers (9) slide up and down on the slide rails (8). 2 . The blackboard eraser according to claim 1 , characterized in that, a tray ( 12 ) is connected under the baffle ( 2 ), and a weight ( 11 ) is arranged in the tray ( 12 ). 3. The blackboard eraser according to claim 1, characterized in that, the guide rail (6) is an arc-shaped guide rail, and its protrusion direction is upward.