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发明名称
等分椭圆板
摘要
一种绘制轴测图的等分椭圆板,有360°分划,长、短轴方向线和轴测轴方向线,有11个同心、同向不同长短轴的椭圆,椭圆上分别有不同等分椭圆的等分线,这些等分线是根据正圆投影原理确定的,等分线上都有小孔。等分椭圆板可用来直接等分椭圆,满足了对20个齿以内的花键、齿轮、蜗轮要准确表示的要求,为20个齿以上的近似表示提供了依据,使用本等分椭圆板,可提高绘图质量和速度。
申请公布号
CN2042420U
申请公布日期
1989.08.09
申请号
CN89201245.5
申请日期
1989.02.01
申请人
总参谋部炮兵装备技术研究所
发明人
杨俊英
分类号
B43L13/00;B43L11/04
主分类号
B43L13/00
代理机构
代理人
主权项
1、一种绘制轴测图的等分椭圆板,上面有360°分划,长短轴方向线和轴测轴方向线,其特征在于,还有11~15个同心、同向的椭圆,这些椭圆由小到大绘有不同的等分线,等分线上都有小孔。
地址
北京市安定门外北苑大院一号
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