Constrained Ball

1 Posted by - September 6, 2010 - Creative tools, Product Design

Constrained Ball or the economy of a rule. The Korean designer Woo GIHAE imagined this drawing tool to achieve perfectly straight lines while measuring them.

People not only write with pen. Other than writing, often we draw lines with pen. Most time people use ruler to draw a straight line or free hand which results winding line. This invention is regarding a method to draw straight line without using ruler. Normally, ball point pen freely rolls in accordance with a ball that located at the tip of pen. This device is to apply a controlling condition to a ball in order to rolls to only one direction. Let’s draw a straight line with a ball that has restrained with directivity. With added ruling device feature, the length of line will be measurable. Even people can draw an exact length of straight line as desired. The total length of line will be indicated on the product by installed measuring wheel. The mounting area is made with a flexible rubber material to provide the best tightness. This product can draw horizontal and vertical lines in addition to 45 angled lines. By using this product, people can draw under lines, tables and desired length of straight lines.


  • Michael December 24, 2010 - 01:00 Reply

    This is by far the best invention i’ve seen through out the whole year, kudos for this, i would buy it right on the spot.

    • JaiGuru March 19, 2014 - 03:29 Reply

      right. Because we’re all just so desperately in need of straight pen lines. I have some wadded up gum wrapper sin my pocket. Wanna buy them?

  • Izkata February 13, 2011 - 16:39 Reply

    There’s only 2 points of contact with the paper – nothing to prevent curving…

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