CN2406831Y - 磁性黑板擦 - Google Patents

磁性黑板擦 Download PDF

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Publication number
CN2406831Y
CN2406831Y CN 99230052 CN99230052U CN2406831Y CN 2406831 Y CN2406831 Y CN 2406831Y CN 99230052 CN99230052 CN 99230052 CN 99230052 U CN99230052 U CN 99230052U CN 2406831 Y CN2406831 Y CN 2406831Y
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ferrite permanent
magnetic patch
magnetic
utility
blackboard eraser
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Expired - Fee Related
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CN 99230052
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谢庆余
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Individual
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Abstract

一种磁性黑板擦,由铁氧体永磁磁块1及在其外表面封包的海绵2和在其底面贴有的底板3组成,它利用磁感应原理,当磁性黑板擦擦拭板面时,可随意擦净磁板的任意部位,本实用新型结构简单、使用方便。

Description

磁性黑板擦
本实用新型涉及一种教学用具。
目前,有一种磁性书写板,如需擦字时,必须移动书写板背面的磁条将字擦除,不能随心所欲地擦除某一部份,特别是如将磁性书写板做成教室用大黑板时,大黑板上书写字很多,如只想擦除中部某几个字很不方便,必须将这几个字及磁条这一边的字全部擦除才行。
为了解决以上问题,本实用新型的目的就是要提供一种结构简单、使用方便的磁性黑板擦。
本实用新型的技术方案是这样实现的:由磁块组成的一种磁性黑板擦,其特点是:磁块是由铁氧体永磁磁块1构成,在铁氧体永磁磁块1的外表面封包有海绵2,在铁氧体永磁磁块1的底面贴有底板3。
由于本实用新型是由铁氧体永磁磁块组成,故能在磁性黑板上任意位置随意涂擦,结构简单,易于制作。
下面结合附图对本实用新型作进一步说明:
图1是本实用新型的结构剖示图。
图中方形的铁氧体永磁磁块1的外表面封包有海绵2,在铁氧体永磁磁块1的底面贴有底板3。当书写笔磁头在充满含定量铁粉油脂糊的蜂窝状密封板面上接触运行时,铁粉随之被吸附在面板上留成线条痕迹。磁性黑板擦内磁块与蜂窝坑内铁粉隔海绵层保持一定距离,手持磁性黑板擦从板正面擦到之处,因磁感应使铁粉呈线状重新排列,以线一端吸附在面板上,由于铁粉细磨到单畴颗粒1um以下,因而看不清楚,视为揩净,痕迹消失。磁性黑板擦为铁氧体永磁块,用15毫米左右厚海绵封包成型,磁块的剩余磁感应强度Br为3950-4100GS。

Claims (1)

1、一种磁性黑板擦,由磁块组成,其特征在于:所述的磁块是由铁氧体永磁磁块(1)构成,在铁氧体永磁磁块(1)的外表面封包有海绵(2),在铁氧体永磁磁块(1)的底面贴有底板(3)。
CN 99230052 1999-11-24 1999-11-24 磁性黑板擦 Expired - Fee Related CN2406831Y (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 99230052 CN2406831Y (zh) 1999-11-24 1999-11-24 磁性黑板擦

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 99230052 CN2406831Y (zh) 1999-11-24 1999-11-24 磁性黑板擦

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CN2406831Y true CN2406831Y (zh) 2000-11-22

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CN 99230052 Expired - Fee Related CN2406831Y (zh) 1999-11-24 1999-11-24 磁性黑板擦

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CN (1) CN2406831Y (zh)

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