JPH0435199Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a blackboard wiper that prevents chalk powder from scattering to the surrounding area.

[Conventional technology]

Most blackboard wipes used in schools and the like consist of a hard handle plate made of wood or plastic, covered with a cushioning material such as a sponge, and a wiping cloth stretched over the cushioning material.

If you use this blackboard wipe to wipe off the letters drawn on the blackboard, the wiping cloth may become clogged, and the dust that cannot be captured by the wiping cloth may scatter around, staining the surrounding area, or causing human injury. may have a negative impact on.

In particular, invisible micron-sized particles float in the air for a long time and do not settle in a container, so they are easily inhaled into the lungs and trachea, which can be harmful to health.

In order to solve these problems, there is an electric type blackboard wiper that applies the principle of a vacuum cleaner to suck the dust that has been wiped off into the body of the blackboard wiper.

[The problem that the idea attempts to solve]

However, electric blackboard wipers require a motor, battery,
Since it includes other accessories, etc., it is large and heavy, and has the disadvantage of being labor-intensive and expensive to manufacture and assemble.

Moreover, not only does it involve extra work such as battery replacement, charging, and maintenance, but it is also prone to breakdowns due to falls and the like.

The present invention was devised in view of the above-mentioned problems, and aims to provide a blackboard wipe that has a simple structure, is small and lightweight, and is excellent in preventing dust from scattering.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an elastically contractible hollow pump chamber on the lower surface of the handle plate, the part of which is non-ventilated except for the wiping surface, and
A check valve with a filter is provided at an appropriate position on the handle plate to allow only the exhaust of air from the pump chamber to the outside, and the pump chamber is filled with an easily deformable elastic block with air permeability. It is a feature.

[Effect]

When a blackboard is wiped with the blackboard wipe of the present invention, the pump chamber naturally expands and contracts depending on the strength of the force applied to the blackboard wipe, and when the pump chamber expands and becomes under negative pressure, the powder spreads onto the surface of the wiping cloth. It will be adsorbed or sucked into the pump chamber and will not be scattered around.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

This blackboard wipe 1 has a hard handle plate 2 on the bottom surface.
A pump chamber 4 is formed in which the lower wiping surface is open and the sides are surrounded by a non-breathable bellows 3. Inside the pump chamber 4, a material that is easily deformable and has breathability, such as sponge, urethane, rubber, non-woven fabric, etc. is formed. The handle plate 2 is filled with elastic blocks 5 and is further covered entirely with a wiping cloth 6 detachably fixed to the upper surface of the handle plate 2.

The exhaust port 7 bored in the center of the handle plate 2 has an
A rubber cap 10 equipped with a check valve 8 and a filter 9, which only allow air to be discharged from the pump chamber 4 to the outside, is removably fitted.

A compression coil spring 11 whose upper end is fixed to the lower surface of the handle plate 2 is embedded in the elastic block 5, so that the pump chamber 4 is constantly and strongly expanded downward.

One end of the wiping cloth 6 is fixed to the upper surface of the handle plate 2 with a pressure plate 12 and a plurality of set screws 13.
And the other end is fixed, for example, by a hook-and-loop fastener 14, etc.
It is detachably fixed to the upper surface of the handle part 2 and can be replaced when worn out.

When attaching the wiping cloth 6, pull the end of the wiping cloth 6 on the side of the hook-and-loop fastener 14, and while slightly contracting the pump chamber 4 against the compression coil spring 11, engage the hook-and-loop fastener 14 and attach the wiping cloth. It is preferable to apply some tension to 6.

When the blackboard is wiped with this blackboard wipe 1, the pump chamber 4 and the elastic block 5 expand and contract repeatedly due to the strength of the pressure applied to the handle plate 2. Due to breathing action, it is absorbed into the wiping cloth 6 or the wiping cloth 6
is sucked into the pump chamber 4 through the weave.

Since the wiping surface is blocked by the blackboard when the blackboard wipe 1 is pressed, the air in the pump chamber 4 when the pump chamber 4 contracts is actively exhausted from the check valve 8 side. .

Therefore, the dust adsorbed on the wiping cloth 6 will not be accidentally scattered around.

Moreover, since the check valve 8 is provided with the filter 9, the dust in the air discharged from the check valve 8 is reliably removed.

Of course, the wiping cloth 6 can be attached to the lower end of the pump chamber 3.

[Effect of idea]

According to the present invention, the structure is relatively simple, so it can be made to the same size and shape as conventional blackboard wipes, and it can be provided at a lower cost than conventional electric wipers. I can do it.

In addition, the instructions for use do not deviate from conventional customs, and the effect of preventing scattering of chiyok powder is excellent, so it is practical.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the blackboard wiper of the present invention. 1... Blackboard cloth, 2... Handle board, 3... Bellows,
4... Pump chamber, 5... Elastic block, 6... Wiping cloth, 7... Exhaust port, 8... Check valve, 9... Filter, 10... Rubber cap, 11... Compression coil spring, 12... ...Press plate, 13... Set screw,
14...Memory fastener.

Claims (1)

[Scope of utility model registration request] An elastically contractible hollow pump chamber is provided on the lower surface of the handle plate, and the portion other than the wiping surface is non-ventilated, and a hollow pump chamber is provided at a suitable location on the handle plate to allow only air to be discharged from the pump chamber to the outside. This blackboard cloth is provided with a check valve with a filter to prevent water leakage, and a pump chamber is filled with a breathable and easily deformable elastic block.