CN2119338U

CN2119338U - Portable electric speed-varying blackboard eraser with means for absorbing chalk dust

Info

Publication number: CN2119338U
Application number: CN 91231528
Authority: CN
Inventors: 刘大伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-11-25
Filing date: 1991-11-25
Publication date: 1992-10-21

Abstract

The utility model relates to an electric speed-varying blackboard eraser with a device for absorbing chalk dust, which is composed of an eraser 1, a fan 2, a motor 3, a chalk dust filtering sponge 4, etc., wherein, the eraser, the motor and the fan are connected together through a pair of bevel gears or helical gears which have different radii and are axially perpendicular to each other. The utility model is in a star-shaped structure, and the erased chalk dust is blown into the chalk dust filtering sponge by the fan so that the utility model avoids the chalk dust flying. The utility model has the advantages of small size and convenient carrying, and due to labor-saving and sanitary use and easy production, the utility model has popularization and application valve.

Description

Portable electric speed-varying blackboard eraser with means for absorbing chalk dust

The utility model belongs to teaching aid, is used for classroom or science and education occasion and wipes after writing with chalk on the blackboard.

Present widely used blackboard eraser is the eraser of general hand-held, and this is that everybody is common, needn't give unnecessary details.This blackboard eraser, operation effort and dust from flying, health is pernicious to health.

Purpose of the present invention just provides a kind of flexible operation, uses the motor driven blackboard eraser of laborsaving sanitation and hygiene again.

As shown in drawings, the utility model is taked following structure: it is made up of eraser 1, fan 2, motor 3 and dust-filtering sponge 4 etc.Fan and motor are contained in the same rotating shaft, and be orthogonal with the rotating shaft of eraser, and they transmit rotational kinetic energy by two different bevel gear or helical gears 6 of radius.With the coaxial tooth radius of eraser greater than with the tooth radius of motor coaxle, so just make the rotating speed of the rotating speed of eraser less than motor and fan, to reduce vibration, increase the pivoting moment of eraser.Eraser, motor, gear hold by tape spool and the support that ventilates 7 fixing, they are contained in the shell 8 of " ┐ " shape jointly.Dust-filtering sponge 4 be contained in fan and motor below, dust is blown into by fan, after this was filtered, clean air was discharged from the bottom 5 of band steam vent.

When the dust on filtering sponge is many, open bottom, take out the sponge water and rinse well, expressed water is replaced and can be used immediately, the easy cleaning easy-to-dry, and it is big to absorb dust capacity, good filtration effect, Here it is adopts sponge to do the reason of filter course.

Above-mentioned said eraser is rooted on the plastic skeleton of being with air vent by mane or nylon fiber and makes, and adopting mane or nylon fiber to make eraser is because of their good toughness, and sticking dust.

The utility model structure becomes " ┐ " shape, vertically part is that the shell at fan, motor and dust-filtering sponge position is just in time by as handle, what motor can be done like this is longer, power output big (it is attractive in appearance and easy to use not influence structure) is to overcome frictional force bigger between eraser and the blackboard.Motor switch just is contained on this handle.

The utility model adopts civil power to do power supply.

In order to place conveniently, shell 8 of the present utility model is provided with a hook, and the time spent can not hang over suitable place.For easy to carry, the utility model can add the overcoat of an artificial leather, can be contained in the overcoat in the time of need carrying and take away.

Description of drawings:

Accompanying drawing is a structural representation of the present utility model.

Among the figure: 1--eraser, 2--fan, 3--motor, 4--dust-filtering sponge, 5--bottom, 6--bevel gear or helical gear, 7--support, 8--shell.

It shown in the accompanying drawing a kind of specific embodiment of the present utility model.As shown in the figure, fan 2 and motor 3 are contained in the same rotating shaft, and be orthogonal with the rotating shaft of eraser 1, and they transmit rotational kinetic energy by two different bevel gear or helical gears 6 of radius, with the coaxial tooth radius of eraser greater than with the tooth radius of motor coaxle.Motor, gear and bearing will add seal closure, in order to avoid enter dust.It below the motor dust-filtering sponge 4.They are contained in the shell 8 of " ┐ " shape jointly.

More than said each member, remove outside motor, mane or the nylon fiber, all adopt plastics or metal to make.

Claims

1, a kind of electric shift dust-collecting type blackboard eraser, constitute by eraser 1, fan 2, motor 3 and dust-filtering sponge 4 etc., it is characterized in that eraser and motor disalignment, the two axially orthogonal, they transmit rotational kinetic energy by a pair of radius different bevel gear or gear 6, with the coaxial tooth radius of eraser greater than with the tooth radius of motor coaxle.

2, blackboard eraser according to claim 1 is characterized in that eraser 1, fan 2, motor 3 and dust-filtering sponge 4 and gear 6 etc. combine, and is contained in jointly in the shell 8 of " ┐ " shape.The axial of motor, fan is vertical direction, and they and dust-filtering sponge are contained in the vertical part.The shell of this part is as handle, and motor switch is contained on the handle.

3, as the blackboard eraser as described in claim 1 and 2, it is characterized in that it has the bottom 5 of band steam vent, said eraser 1 has air vent; Adopt sponge to do dust filtering layer.

4, as the blackboard eraser as described in claim 1 and 2, it is characterized in that said each member, remove outside motor, mane or the nylon fiber, all adopt plastics or metal to make.