CN1281796A

CN1281796A - Magnetic blackboard

Info

Publication number: CN1281796A
Application number: CN 99111819
Authority: CN
Inventors: 张明; 侯毅
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-22
Filing date: 1999-07-22
Publication date: 2001-01-31

Abstract

The magnetic blackboard is characterized by that a honeycombed black hard plastic board is used, a layer of meshed magnetic board is placed in the middle of the above-metioned honeycombed black hard plastic board and paralled to it, the mesh of the magnetic board and honeycomb hole of plastic plate are coincident, and the interior of every honeycomb hole is equipped with a movable small magnetic needle, and the N pole of said small magnetic needle is identical to N pole of meshed magnetic board in direction. A glass board is stuck on the surface of honeycomb hole as writing magnetic blackboard, and matched with magnetic writing pen and magnetic eraser so as to make it can conveniently use and have no dust pullution.

Description

Magnet board

The present invention is used for aspects such as the teacher teaches or children practise handwriting.

At present, traditional blackboard is write with chalk, wipe the time chalk powder is horizontal flies, promptly unhygienic, unfavorable Faculty and Students is healthy again.

The purpose of this invention is to provide a kind of magnet board and supporting with it lettering pen and blackboard eraser, it uses not only convenient but also no dust pollution, therefore helps the healthy of Faculty and Students.

The object of the present invention is achieved like this: there is the equal-sized tiny honeycomb hole of positive hexagon perpendicular to plastic plate that is evenly distributed in the black rigid plastic sheet front that is called cellular mainboard, and the back side is the plane.A mobilizable right cylindrical small magnetic needle is arranged in each honeycomb hole.Be made into the netted magnetic sheet that one deck is parallel to mainboard in the middle of the cellular mainboard.Positive hexagon mesh on the netted magnetic sheet and the honeycomb hole on the plastic plate fit like a glove.The medium line of magnetic sheet thickness equals the length and 1/2nd magnetic sheet thickness sums of small magnetic needle apart from the distance in honeycomb aperture.The distance of the medium line of magnetic sheet thickness at the bottom of the honeycomb hole is slightly less than the length and 1/2nd magnetic sheet thickness sums of small magnetic needle.The positive sticking glass plate equal-sized with it of cellular mainboard makes it to be combined into one with mainboard.Glass plate is as writing surface.The N utmost point of netted magnetic sheet (or S utmost point) points to glass plate, and the N utmost point of small magnetic needle is identical with the N extreme direction of netted magnetic sheet in the honeycomb hole.Small magnetic needle N utmost point painted white.If the S utmost point of netted magnetic sheet points to glass plate, then the S utmost point painted white of small magnetic needle, magnetic a little less than netted magnetic sheet and small magnetic needle show.Because cellular mainboard is black, the small magnetic needle that the N utmost point (or S utmost point) is white in color can be not reflective at the bottom of being positioned at tiny honeycomb hole under the magnetic field force effect of netted magnetic sheet, and therefore whole plate face is black.Lettering pen is that one section S utmost point is that hemisphere is done nib, the N utmost point is the cylindric kicker magnet that a tail is done on the plane, the uniform rubber sleeve of overcoat thin and thick.Magnet scratched glass plate when rubber sleeve prevented to write.If the S utmost point of netted magnetic sheet points to glass plate, then the lettering pen nib is the N utmost point, and a tail is the S utmost point.The plastic casing of blackboard eraser is identical with the ordinary blackboard eraser shape, the sticking strong magnetic sheet of block length side's bodily form in the shell, N extremely outwards (if the S utmost point of netted magnetic sheet point to glass plate, then S is extremely outside) form scouring face with shell all around.Whole scouring face glues one deck sponge, and the scratch glass plate has cleaning action to glass plate on the other hand during with anti-friction word.When writing, with the writing surface of the nib of lettering pen contact magnet board, the N utmost point (or S utmost point) of the high-intensity magnetic field power of lettering pen at the bottom of with honeycomb hole inhaled for the small magnetic needle of white and fixed to glass plate and by the magnetic field force of netted magnetic sheet.On black plate face, occur at interval uniform circular small particles like this and form stroke and then form font by it.When wiping, the scouring of blackboard eraser is in the face of just by the face of erasing the board, and fixed by the magnetic field force of netted magnetic sheet at the bottom of by the high-intensity magnetic field power of blackboard eraser small magnetic needle being advanced honeycomb hole, makes blackboard surface be black again.

The present invention uses not only convenient but also no dust pollution, is a kind of environment-friendly products therefore.

Further specify the present invention below in conjunction with accompanying drawing.

Fig. 1 is the front view of magnet board.

Fig. 2 is A-cutaway view of Fig. 1.

Fig. 3 is the longitudinal sectional view of lettering pen.

Fig. 4 is the longitudinal sectional view of blackboard eraser.

Among the figure: 1, cellular mainboard, 2, honeycomb hole, 3, small magnetic needle, 4, glass plate, 5, lettering pen, 6, netted magnetic sheet, 7, rubber sleeve, 8, cylindrical magnet, 9, sponge, 10, cuboid magnetic sheet, 11, plastic casing.

In Fig. 1, cellular mainboard (1) is bonded to one with glass plate (4).The just cylindric small magnetic needle (3) of N utmost point painted white be positioned at positive six prismatic red honeycomb holes (2) and the N level outside.Small magnetic needle (3) can move around along the hole direction in honeycomb hole (2).Netted magnetic sheet (6) is positioned at the centre position of cellular mainboard (1), (as Fig. 2).The N pole-face of netted magnetic sheet (6) equals the length of small magnetic needle (3) apart from the distance of glass plate.The distance of the S pole-face of netted magnetic sheet (6) at the bottom of the honeycomb hole is slightly less than the length of small magnetic needle (3).When blackboard was clean, small magnetic needle (3) was positioned at the bottom of honeycomb hole (2) under the effect of the magnetic field of reticular lamina (6), make blackboard surface be black.When writing, sphere nib (as Fig. 3) contact glass plate (4) of lettering pen (5) and below when mobile left, the active force that the small magnetic needle that the N utmost point is white in color (3) attracts to shake off down netted magnetic sheet (6) at the S utmost point of the cylindric kicker magnet (8) of lettering pen (5) are shifted to glass plate (4) and are fixed once more and formed a left-falling stroke by the magnetic field force of netted magnetic sheet (6).When wiping, blackboard eraser (as Fig. 4) is cleaned the glass plate of sponge (9) contact one left-falling stroke place of face, small magnetic needle (3) is shaken off netted magnetic sheet (6) under the N utmost point of the strong magnetic sheet of cuboid (10) of blackboard eraser inside repels active force is got back to the bottom of honeycomb hole (2), makes blackboard surface revert to black.

Claims

1, a kind of magnet board is characterized in that: interact by certain compound mode between the magnet of a cellular black writing intralamellar part and supporting with it magnetic writing pen and the magnetism eraser.

2, magnet board according to claim 1 is characterized in that: there is the equal-sized tiny honeycomb hole of positive hexagon perpendicular to plastic plate that is evenly distributed in cellular black rigid plastic sheet front, and the back side is the plane.Positive sticking glass plate is as writing surface.Be made into the netted magnetic sheet that one deck is parallel to plastic plate in the middle of the honeycombed plastic plate.The N utmost point of netted magnetic sheet (or S utmost point) points to glass plate.Positive hexagon mesh on the netted magnetic sheet and the honeycomb hole on the plastic plate fit like a glove.A right cylindrical small magnetic needle that can move along the hole direction is arranged in each honeycomb hole.The N utmost point of small magnetic needle is identical with the N extreme direction of netted magnetic sheet.Small magnetic needle and netted magnetic sheet show weak magnetic.The N pole-face of netted magnetic sheet (or S pole-face) equals the length of small magnetic needle apart from the distance of glass plate.The distance of the S pole-face of netted magnetic sheet (or N pole-face) at the bottom of the honeycomb hole is slightly less than the length of small magnetic needle.

3, magnet board according to claim 1 is characterized in that: the hemisphere nib of cylindric ferromagnetism lettering pen is the S utmost point, and the scouring face of ferromagnetism blackboard eraser is the N utmost point.If the S utmost point of netted magnetic sheet points to glass plate, then the nib of magnetic writing pen should be the N utmost point, and the scouring face of magnetism eraser should be the S utmost point.