CN202115204U - 带磁球的教学圆规 - Google Patents

带磁球的教学圆规 Download PDF

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CN202115204U
CN202115204U CN2011201625897U CN201120162589U CN202115204U CN 202115204 U CN202115204 U CN 202115204U CN 2011201625897 U CN2011201625897 U CN 2011201625897U CN 201120162589 U CN201120162589 U CN 201120162589U CN 202115204 U CN202115204 U CN 202115204U
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吕仁禄
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Abstract

本实用新型涉及一种教学器具,尤其是涉及一种作图教学用的带磁球的教学圆规。本实用新型是在圆规中固定圆心的那条杆的下端设有一个小磁球。画圆时,拿好圆规让小磁球(1)吸定在黑板上指定的圆心位置,转动圆规即可由粉笔(5)方便地画出圆。

Description

带磁球的教学圆规
所属技术领域
本实用新型涉及一种教学器具,尤其是涉及一种作图教学用的带磁球的教学圆规。 
背景技术
目前学校教学用的圆规品种很多,但还没有一种可以很方便的将圆规一条杆下端固定在指定圆心位置的圆规。 
发明内容
本实用新型的目的是提供一种这样的带磁球的教学圆规,它可以很方便地将圆规一条杆下端固定在铁质黑板上的指定圆心位置。 
本实用新型解决其技术问题所采用的技术方案是:在圆规中固定圆心的那条杆(2)的下端设有一个小磁球(1),且小磁球(1)与杆(2)之间为刚连接。 
本实用新型的有益效果是:由于采用了上述方案,教师在铁质黑板上画圆时,就可以很方便地将固定圆心的那条杆下端吸定在黑板上指定位置,从而使画圆变得非常方便。 
附图说明
下面结合附图和实施例对本实用新型进一步说明。 
图中所示的是本实用新型的结构示意图; 
图中1、小磁球,2、杆,3、紧固螺丝,4、紧锁环,5、粉笔。 
具体实施方式
如图所示,本实用新型是在圆规中固定圆心的那条杆(2)下端设有一个小磁球(1),且小磁球(1)与杆(2)之间为刚连接。画圆时,装上长度适当的粉笔(5),拉紧紧锁环(4),先分开圆规两条杆(2),使小磁球(1)的最下端与粉笔(5)笔端之间的距离等于指定半径值,拿好圆规让小磁球(1)吸定在黑板上指定的圆心位置,转动圆规即可由粉笔(5)方便地画出圆。 

Claims (1)

1.一种带磁球的教学圆规,其特征是:在圆规中固定圆心的那条杆(2)下端设有一个小磁球(1),且小磁球(1)与杆(2)之间为刚连接。 
CN2011201625897U 2011-05-12 2011-05-12 带磁球的教学圆规 Expired - Fee Related CN202115204U (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201625897U CN202115204U (zh) 2011-05-12 2011-05-12 带磁球的教学圆规

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011201625897U CN202115204U (zh) 2011-05-12 2011-05-12 带磁球的教学圆规

Publications (1)

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CN202115204U true CN202115204U (zh) 2012-01-18

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CN2011201625897U Expired - Fee Related CN202115204U (zh) 2011-05-12 2011-05-12 带磁球的教学圆规

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CN (1) CN202115204U (zh)

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Granted publication date: 20120118

Termination date: 20120512