BACKGROUND OF THE INVENTION
FIELD OF INVENTION
This invention relates to the prevention of spreading of chalk dust particles in to the atmosphere, since it creates some health issues.
BACKGROUND OF THE PRESENT INVENTION
In schools, colleges and other educational institutions people erase the chalk powder from the blackboard and clean the duster by tapping on the wall or somewhere else. This process cleans the duster but gives birth to lot of health problems. It creates foam of chalk dust into the surroundings. This creates a lot of health issues not only to the faculty or the person who taps the duster on the wall but also to those who are nearer [1], Many health issues [3] like wheezing cough and also asthma may affect the people. So, we had taken this into consideration and we started this invention. We found a solution to overcome this issue by preventing the chalk foam from moving into the surroundings.
[5,6,7,8,9,10.11,12,13]-reference
For this purpose, we designed a duster cleaner which will prevent the dust from coming into the surroundings while tapping the duster. In this model.we used a simple concept without any usage of electrical energy or any form of external energy; we used a wooden box containing a mesh of mild steel net fixed and inclined atcertain angles. At this mesh, people can tap their duster. When the duster is tapped on the'net, the chalk particles will fall inside the wooden box, i.e. the dust will be collected behjnd the mesh net. The chalk powder can be removed periodically. This will help us to provide a clean dust free environment [4].
IP-219747 (mecha duster) discloses a high rpm motor that sucks the dust from the chalkboard duster and this prevents the spreading of dust into the atmosphere.

Summary
A new chalkboard duster cleaner working without any electrical input or any form of fuel energy that removes 99% of dust from duster. This cleaner made of wood and steel, less weight, works in a simple manner and occupies only small size in the classroom or in the place where it is used. The duster cleaner removes dust from duster just by rubbing on the cleaner
This invention is to reduce the public nuisance (by the chalk dust) while cleaning the board in colleges, schools and institutions. Many people do not feel comfortable with dust particles and especially chalk dust, as many people are suffering from asthma and many dust diseases. This invention contains a mild steel square gaped mesh where the duster is rubbed to remove the chalk dust. The plate is fixed in such a way the dust won't come out of the casing. If it is too much inclined to the wall then it will be disturbing the path. The better position of the plate is 75 degrees to the ground. The total area of the plate will be about 20x40 in cm. The inclination of the plate can also be about 60 degrees if required. This process is after cleaning the board by using the duster the duster is cleaned by rubbing it in the duster cleaner which is fixed in the wall. After cleaning the duster the chalk powder is removed by means of a drawer, which is also fitted with casing. The chalk powder which is obtained can be used for the reuse of the production of the chalk piece.
The various analysis on the invention
The analysis was done with three meshes which are differentiated by the grid length,
• First mesh with 1cm gape (means the side of a square in the mesh is about 1cm)
• Second with 2cm and
• Third with 3cm

Mesh with 1 cm square side:
At 30° position:

Let, the mass of the dust in the duster = x gram (before tapping in the cleaner.)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 3%-4%. The 92% of the dust particles will be settled inside the mesh which can be reused or whatever it may be.4% of dust can't, be removed from the duster due to some frictional attractions between the duster and the dust:
Disadvantages:
• Occupies more space than other inclinations

At 45° position:
Let the mass of the dust in the duster = x gram (before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 4%-5%.The 94% of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 4% of the dust stays in the duster itself.
Note: Occupies less space compared to 30" inclination.
At 60° position:
Let the mass of the dust in the duster = x gram (before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 2%-3%.The 94% of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 4% of the dust stays in the duster itself asusual.
Advantages:
• This position will be little bit comfortable, since it occupies less space.

Mesh with 2 cm square side:
At 30° position:
Let, the mass of the dust in the duster = x gram (before tapping in the cleaner.)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 3%-4%. The 90% of the dust particles will be settled inside the mesh which can be reused or whatever it may be.6% of dust can't be removed from the duster due to some frictional attractionsbetween the duster and the dust.
Disadvantages:
• Occupies more space than other inclinations

At 45° position:
Let the mass of the dust in the duster = x gram (before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 5%-6%.The 89% " of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 6% of the dust - stays in the duster itself asusual.
Note: Occupies less space than at 30°
At 60° position:
Let the mass of the dust in the duster = x gram (before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 4%-5%.The 90% of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 6% of the dust stays in the duster itself as usual.

•At 75° position:
. Let the mass of the dust in the duster = x gram (before tapping in.the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 3%-4%.The 91% of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 6% of the dust stays in the duster itself asusual.

At 90" position:
Let the mass of the dust in the duster = x gram-(before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 3%-4%.The 50% of the dust particles will be settled inside the mesh which can be reused or whatever it may. be. And about ""40%i of dust falls outside the mesh: 6% of the dust stays in the duster itself asusual.
Disadvantages: The most inefficient position is this one among other positions mentioned above.

iMesh with 3 cm square side:
At 30° position:
Let, the mass of the dust in the duster = x gram (before tapping in the cleaner.)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 5%-6%. The 88% of the dust particles will be settled inside the mesh which can be reused or whatever it may be.8% of dust can't be removed from the duster due to some frictional attractions between the duster and the dust.
Disadvantages:
• Occupies more space than other inclinations.

At 45° position:
Let the mass of the dust in the duster = x gram (before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 5%-6%.The 88% of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 6% of the dust stays in the duster itself asusual.
Note: Occupies less space than at 30Q

At 60° position:
Let the mass of the dust in the duster = x gram (before tapping in the cleaner)
While tapping the duster in the mesh the amount of dust spreads in the atmosphere is about 4%r5%.The 89% of the dust particles will be settled inside the mesh which can be reused or whatever it may be. 6% of the dust, stays in the duster itself asusual.

CLAIMS:
1. We claim a chalkboard duster cleaner which has a mesh at 45° and with 1cm grid length has good -result as it removes about 94% of dust particles.
2. We claim the mesh with 2cm grid length has about removal of 90% of dust at 60° positon.
3. We claim the advantage of 60° position is it will require less space.
4. We claim the grid with 1 cm grid length and at 60° inclination gives good result as it requires less area and intakes about 94 % of dust particles.