圓周周長量測工具

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

105144066

專利證號

I 592631

專利獲證名稱

圓周周長量測工具

專利所屬機關 (申請機關)

國立臺灣師範大學

獲證日期

2017/07/21

技術說明

本發明提供一種圓周周長量測工具，包括至少一圓盤，於圓盤之圓周上設有一穿孔；一直尺，其上設有一固定柱及複數刻度，圓盤之穿孔穿過固定柱使圓盤套設於固定柱上；以及一套繩，其一端被固定柱穿過，另一端可環繞圓盤或沿著直尺拉直。因此，先將線繩環繞圓盤之圓周，並將環繞一圈後回到固定柱之位置加註一標記，再將線繩沿著直尺拉直，依據標記與直尺刻度之相對位置，便可得到圓盤之一圓周長度，若已知圓盤直徑，還可將圓周長度除以圓盤直徑，得到圓周率。 The present invention provides a circumferential circumference measuring tool comprising at least one disc having a perforation on the circumference of the disc; a ruler provided with a fixed post and a plurality of scales, the perforations of the disc passing through the fixing post Is provided on the fixed column; and a set of ends, one end of which is fixed by a fixed column, and the other end can be rotated around the disc or along the ruler. Therefore, the first line around the circumference of the disk, and will be around after a lap back to the fixed column of the location of a mark, and then straighten the line along the straight ruler, according to the mark and ruler scale relative position, It is possible to obtain a circumferential length of one of the disks. If the diameter of the disk is known, the circumferential length can be divided by the diameter of the disk to obtain the circumferential rate.

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產學合作組

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