发明授权
- 专利标题: Drafting instrument
- 专利标题(中): 起草仪器
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申请号: US899943申请日: 1978-04-25
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公开(公告)号: US4173829A公开(公告)日: 1979-11-13
- 发明人: George Khait
- 申请人: George Khait
- 专利权人: George Khait
- 当前专利权人: George Khait
- 主分类号: B43L9/00
- IPC分类号: B43L9/00 ; B43L13/02 ; B43L13/20 ; B43L9/04
摘要:
A template for drawing accurately-positioned circular or straight lines regardless of the tip angle and diameter of the writing instrument used therewith has specially-shaped holes positioned at respectively different, predetermined spacings from a reference point, which may be an edge of the template or a pivot point on the template. Each hole has an elongated shape with opposed edges which converge at acute angles and which are equidistantly spaced from the line the hole is provided to draw. The holes may be arranged in parallel rows and spaced predetermined distances from either a single pivot point or multiple pivot points, or they may be in radial rows emanating from a single pivot point. The pivot point may comprise a pierced removable insert to accept wear from a pivot such as a tack, or it may be a hole in the template with a pivot point springably mounted adjacent the hole and lowerable thereinto.
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