CN2056391U

CN2056391U - Blackboard rubber with suction for chalk powder

Info

Publication number: CN2056391U
Application number: CN 88214636
Authority: CN
Inventors: 刘树生
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-10-04
Filing date: 1988-10-04
Publication date: 1990-04-25

Abstract

The utility model provides a novel teaching device for wiping chalk writings on blackboards. The device is characterized in that the lower side of the dust collecting box is adhered with a double side inclination rubber body and an inclination control baffle. Thus, a dust collecting channel is formed and communicated with the dust collecting box. The central position of the double side inclination rubber body is provided with a foam block. When using, the double side inclination rubber body can scrape powder dust down, and under the function of the inclination control baffle, the powder dust fall into the dust collecting channel and then move into the dust collecting box. At the moment, the foam block can thoroughly erase the remained traces. Therefore, the dust collecting and the trace removing works are accomplished.

Description

Blackboard rubber with suction for chalk powder

The utility model relates to a kind of improved black wiping of pulling, and particularly can be effectively pull the chalk font of writing and wipe deceiving, and a kind of device that dust can be reclaimed.The teaching aid of usefulness is suitable for imparting knowledge to students.

Existing black pull to wipe pull bonding the composition by felt, wood, though the chalk font is wiped when using, dust really uncontrollable to the time dust fly upward everywhere and pollute, the operator is caused very big worried and painful.By the careful amplification that writes on black chalk font of pulling is observed, it is made up of very thin pulverized limestone and font more clearly just occurred to find letter written with chalk.

For addressing the above problem, the utility model provides a kind of improved black wiping of pulling of gathering dust, and it not only can be cleaned chalk writing but also dust can be recovered to institute and decide regional gathering dust and pull wiping.

The purpose of this utility model is achieved in that and is stained with two-sided gradient rubber bodies and sponge blob of viscose below dust collection box, and both sides are stained with gradient control retaining and pull the inclination of the formation passage that gathers dust, and this passage is communicated with dust collection box.Dust is wiped off dust by two-sided gradient rubber bodies and is entered the passage that gathers dust and arrive in the dust collection box during operation.Leaving unclear writing under the effect of sponge blob of viscose is wiped by the sponge blob of viscose.

Below in conjunction with accompanying drawing utility model is further described:

Accompanying drawing is that black the pulling of gathering dust that the utility model proposes wiped the device cutaway view.

With reference to accompanying drawing: but 1. and be bonded at the two-sided gradient rubber bodies that plays scraping action middle part below it made through sulfuration by rubber 3. the dust collection box used of the storage dust of the intermediate hollow made of box phase fastener up and down by two for this device, in middle part sipes 3., be stained with in order to clean sponge blob of viscose that chalk writing uses 4., be stained with at 5～7 millimeters places, both sides 3. to have made and stop dust disorderly to fly upward and rise to force with plastics, 2. the gradient that the guiding dust enters in the passage that gathers dust controls baffle plate, 3. and 2. 5～7 millimeters places between be that 5. the inclination that the forms passage that gathers dust is preferably 50-75 ° to improve the flowing velocity of dust in its passage inclination angle, 1. 5. this passage that gathers dust communicate with dust collection box.

Claims

1, a kind of improved black wiping of pulling of gathering dust, particularly will deceive the device of pulling the chalk font dust recovery of writing, the bonding two-sided gradient rubber bodies in dust collection box following middle part 1. that it is characterized in that hollow 3., 3. there is sipes at middle part, be stained with the sponge blob of viscose in the groove 4., 4. level is higher than 1～3 millimeter on plane 3., locating bonding the gradient control retaining that is lower than 1～3 millimeter on 3. plane 5～7 millimeters of 3. two lateral extents 2. pulls, 3. 1. 5. the groove that promptly forms with 2. 5～7 millimeters space of distance communicate this passage with dust collection box for gathering dust passage 5..

2, according to the described device of claim 1, the passage inclination angle 5. that it is characterized in that gathering dust is 50～75 °.