CN2115224U

CN2115224U - Rotary blackboard

Info

Publication number: CN2115224U
Application number: CN 91208588
Authority: CN
Inventors: 丁尚立
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-05-20
Filing date: 1991-05-20
Publication date: 1992-09-09

Abstract

The utility model relates to a rotary blackboard, belonging to a new type of teaching aid. A motor is used to drive an upper and a lower rollers to rotate, and a rolling blind rotates on the surface of the upper and the lower rollers. The rolling blind is an annular flexible belt without joint, the base of the annular flexible belt is made of canvas, and the surface layer of the annular flexible belt is made of black artificial suede. Words are written on the surface of the rolling blind in writing. The rotary blackboard can automatically control writing height and automatically erase the blackboard.

Description

Rotary blackboard

Rotary blackboard belongs to a kind of new teaching apparatus, uses rotary blackboard can significantly reduce chalk dust to the misery that the teacher brings, and reduces labor intensity.

At present, the blackboard of selling on the market has: 1, wooden blackboard, 2, Glass blackboard, 3, magnet board, 4, can adjust the blackboard of height up and down.More than the common advantage of these blackboards be, write smoothly, contrast is big, and is clear, good hand touch etc.But there are some common shortcomings again in above all kinds of blackboard, 1, need erase the board, 2, height can not reconcile arbitrarily.Though need not erase the board after magnet board uses up, magnet board involves great expense, be difficult to be installed in the classroom and use.So the blackboard of producing brings many worries to the teacher at present.One, unhygienic, the chalk dust of wiping has dust, and is harmful to people's health.Its two, it highly is not contour writing, and write at a blackboard, just must write the bottom of blackboard from the top of blackboard always, this blackboard is all improper to the large and small people of height.Both having made the blackboard of adjustment height, also only is two blackboard exchanges back and forth up and down up and down, can not be placed on the centre position, so-called exactly putting in place.

The purpose of this utility model is to provide a kind of practicality, rotary blackboard inexpensive, simple to operate for school.Use the utility model can solve following two problems: 1, not choosing erases the board, and has automatic blackboard cleaning device.2, can the free adjustment height, need not fill up pin when writing and squat down.

Design principle of the present utility model is seen figure one, by roller shutter 1, and bottom roll 2, base plate lower support frame 3, base plate 4, base plate upper support frame 5, last cylinder 6, eraser 7, chalk dust connect box 8, direct current generator 9, power switch 10.When writing letter written with chalk is write on the outer surface of roller shutter 1.When needs transposings roller shutter 1 write word height the time, Push switch 10, direct current generator 9 energising work.Bottom roll 2 rotations drive roller shutter 1 around bottom roll 2, and last cylinder 6 rotates.Wiped by the frictional force that produces between eraser 7 and the roller shutter 1 when still letter written with chalk is by eraser 7.Chalk dust since gravity fall into chalk dust and connect in the box 8.

Characteristics one of the present utility model, letter written with chalk are the outer surfaces that writes on roller shutter 1.Roller shutter 1 is a canvas by base, during the soft band work of the non junction ring-type that the material of the imitative sheepskin of top layer bonding one deck black is made roller shutter 1 at bottom roll 2, on roll 6 between rotation, the conversion writing position.

The utility model symbol point two, eraser are the garden rollers of being made by steel tube surface bonding felt rug.When letter written with chalk passed through eraser 7, letter written with chalk was owing to the effect of the frictional force that produces between roller shutter 1 and the eraser 7 is wiped.

Claims

1, rotary blackboard by: roller shutter 1, bottom roll 2, base plate 4, go up cylinder 6, eraser 7, combine.It is characterized in that roller shutter 1, by bottom roll 2 drive last cylinder 6, between produce swing offset, eraser 7, the back that is fixed on base plate 4 and last cylinder 6, between by chain connect transmission with roller shutter 1, produce contrary direction rotation, play the effect of wiping word and tensioner.

2, rotary blackboard according to claim 1, it is characterized in that roller shutter 1, being is the soft band of non junction ring-type that canvas, the imitative sheepskin material of surface bonding one deck black are made by base.

3, rotary blackboard according to claim 1 is characterized in that, eraser is the round roller of being made by outer surface of steel tube bonding felt rug.