Tool for drawing large-scale circle

Abstract

The invention discloses a tool for drawing a large-scale circle and relates to a circle tool. A handle (1) and a locating pin (14) are respectively arranged at two ends of a vertical pole (2), wherein a lock sleeve (15) is fixed at the lower portion of the vertical pole through a locknut (16), and an adjusting rod seat (13) at one side of the locking sleeve is hinged at one end of a length adjustment lever (8) through a shaft (6). The lower ends of spring seats (18) are fixed on the adjusting rod seat of the lock sleeve through a pin roll (17). A rotating piece (19) is connected between the upper portion of the spring seats through a rotating shaft (20), the upper portion surface, close to one end, of the length adjustment lever is connected with the lower end of an anti-loose plate (3), a screw (4) is connected with a screw hole (23) in the rotating piece penetrating through the anti-loose plate and a spring (25), and a scratch awl (12) is arranged at the lower portion of a slide block (10) sleeved on the length adjustment lever. The locating pin is placed at the center of a circle by the handle pressing, the scratch awl is corresponding to the circle, and the normative circle is drawn at a flat surface or a non-flat surface by a spring.

Description

【Technical field】 [0001] The invention relates to a circle tool, in particular to a tool for drawing large circles. 【Background technique】 [0002] As is known, when drawing a circle on a stone surface or a metal plate, small ones can be realized by using a scribe gauge, also known as a planning plan, but when a circle exceeds 20 cm or even a few meters, only a positioning pin in the middle can be used. The line drives the scribe needle on the periphery of the circle to draw the line. The accuracy of this method is low, and the error of the drawn circle sometimes exceeds a few centimeters. Therefore, some workers have come up with the idea of ​​using a ruler to draw multiple points. "method", and then use lines to connect, the circle drawn in this way is not very round, and there is no line drawing tool for large circles on the market. 【Content of invention】 [0003] In order to overcome the deficiencies in the background technology, the present invention discloses a tool...

AI Technical Summary

Problems solved by technology

[0002] As is known, when drawing a circle on a stone surface or a metal plate, small ones can be realized by using a scribe gauge, also known as a planning plan, but when a circle exceeds 20 cm or even a few meters, only a positioning pin in the middle can be used. The line drives the scribe needle on the periphery of the circle to draw the line. The accuracy of this method is low, and the error of the drawn circle sometimes exceeds a few centimeters. Therefore, some workers have come up with the idea of ​​using a ruler to draw multiple points. method", and then use lines to connect, the circles drawn in this way are not very round, and there is no line drawing tool for large circles on the market

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