Helically Formed Cylinder Of Varying Length And Diameter.
On 6/14/2005, United States Patent 6904941 issued.
The abstract is as follows:
A variable diameter cylinder made from a sheet having first and second edges that are opposite to each other and that slideably connect with each other to form a helical joint of a cylinder such that sliding the edges of the sheet along the joint varies a diameter and length of the cylinder. When marked with a scale, the cylinder acts as a measuring device that is both highly accurate and easy to use. A helical-based scale can be used alone, or a linear scale can be used in combination with a Vernier scale.
Clock Tower Law Group was the firm of record for this patent document as of the issue date.