CN2064310U

CN2064310U - Eraser without dust

Info

Publication number: CN2064310U
Application number: CN 90213334
Authority: CN
Inventors: 李廷刚
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-05-19
Filing date: 1990-05-19
Publication date: 1990-10-24

Abstract

The utility model relates to a blackboard eraser without dust, comprising a bottom board, an erasing head and a middle dust suction portion, wherein, the dust suction portion is specifically composed of two transverse axes, each axis is provided with three tooth gears, and the outermost and large tooth gear is a friction gear. The friction force between the friction gear and a blackboard drives other tooth gears to rotate; the rotation of a worm gear and a worm bar drives a blade bar and a blade slice to rotate; in the end, the goal of dust suction is achieved; the outermost portion of the utility model is the erasing head portion which is made of cotton fabrics such as wool felt, etc. The utility model has the advantages of simple structure, no dust in use, convenient operation and good effect and a dust suction function is formed by the friction force.

Description

Eraser without dust

The utility model relates to a kind of dust-free black board eraser.

At present the widely used a kind of blackboard eraser of people all is fixedly one deck felt or other staple thing on a base plate or on the plastic plate, in order to wipe the letter written with chalk on the blackboard, though it is simple, easy to use that this kind blackboard eraser is processed, but there is not dustproof effect, the chalk dust of being wiped not disperses in air, near the near people of blackboard with the expiration suction body in, extremely unhygienic, the body and mind to the people has very big infringement for a long time.

For solving above deficiency, the utility model provides a kind of dust-free black board eraser, is provided with simple dust exhaust apparatus in blackboard eraser, utilizes the friction of blackboard eraser itself to produce a kind of self-suction function, thereby has reached dustless purpose.

Structure of the present utility model is two parts (as shown in Figure 1) the one, the mechanical gear running part of the left and right sides, the 2nd, the wiping head part of bottom, two parts are superimposed with the connection of fastening combination, the mechanical part two ends are symmetric form, in each side two transverse axis are arranged, wherein on an axle three gears are arranged, outermost is a friction pulley, protrude the surface, when wiping examination just and blackboard be Frotteurism, the inside is a pinion, this two gear all is fixed into one with axle, between little tooth and friction pulley, be placed with a gear, throw off with axle, can be one-directional rotation around axle, because of the little tooth of stop being housed at pinion and idler gear one side, effect by spring, force idler gear to be folk prescription to rotation, the gear interlock of idler gear and another shaft end again, another centre is a flying wheel, the inside still has a gear, with the interlock of crossbar end gear, the cross bar other end and blade shaft are connected to the worm and gear structure, still have a flying wheel on the top of blade shaft, rotation by friction wheel can promote the fan blade rotation through gear transmission, the middle dust catcher that forms, for wiping head part, air suction opening is left in the centre below dust catcher, on every side for having the wiping head of aperture, can be soft bafta, woollen blanket etc., leave dust cavity in the fan blade back, the grit that is inhaled into is stored in the chamber, can open loam cake after having filled and get rid of dust.

The utility model and prior art relatively have following advantage: owing to utilize friction generation adsorption function itself, simple in structure, easy to use, pick-up performance is good.

The accompanying drawings embodiment:

Fig. 1 is the dust-free black board eraser structure principle chart.

Fig. 2 wipes the head part structure chart for dust-free black board eraser.

Know by Fig. 1,1 is the top wheel shaft, 2 is the bottom wheel shaft, three gears are arranged on wheel shaft 2, outside 3 is a friction wheel, bigger, can directly contact with blackboard, 5 is pinion, 3 and 5 and the axle be fixed together, at 2 and 5 sandwich, one gear 4, throw off with axle, with make the gear 4 can only be by little stop tooth in the middle of the pinion 5 to folk prescription to rotation, pinion 5 is when backward rotation, gear 4 keeps motionless, with gear 4 interlocks is the end gear of axle on 1, rotation along with 4 and counter-rotation, the other end of axle 1 is a gear 7, axle 1 cog 7 and gear 4 between a gear wheel 6 be installed be flying wheel, retainer shaft 1 running steadily, 9 is cross bar, 8 is the crossbar end gear, be interlocked with gear 7,10 is worm gear, the worm screw tie point: 11 is the leaf bar, 12 is blade, on leaf bar 11 tops flying wheel 14 is installed still, 13 is that leaf bar fixed mount also is the dividing plate of dust simultaneously, because rubbing to rotate on blackboard, friction wheel make the blade rotation form dust-absorbing function, know by Fig. 2,15 for wiping head below blade 12, the centre is an air suction opening, and for having the felt of aperture and bafta etc., wiping head is the loam cake of dust-free black board eraser on every side, combine with the vacuum part fastening on top around it, so that take down the eliminating dust at any time.

Claims

1, a kind of dust-free black board eraser, it is to be made of base plate and the wiping head that has bafta, and of the present utility model being characterised in that at base plate with in the middle of wiping head is equipped with a dust exhaust apparatus of being made up of axostylus axostyle 1,2, friction wheel 3, gear 4,5,6,7,8, cross bar 9, worm gear, worm screw 10 and leaf bar 11, blade 12.

2, by the described dust-free black board eraser of claim 1, it is characterized in that on axle 2, being equipped with three wheels, outermost bull wheel 3 is a friction wheel, protrude and wipe head surface, the inside pinion 5, idler gear 4, the stop pinion is housed among 4,5, make gear 4 can only one-directional rotation, 3 and 5 and axle 2 be fixed together.

3, by the described dust-free black board eraser of claim 1, it is characterized in that axle 1 end gear and gear 4 interlocks, the other end gear 7 and gear 8 interlocks, and flying wheel 6 is housed in the centre.

4, by the described dust-free black board eraser of claim 1, it is characterized in that flying wheel 14 being housed on leaf bar 11 tops.