US 2011/0296700 A1 · Straight edge circle tool

Abstract

The tool is formed of an elongate rigid bar having a pair of straight side edges extending between opposite ends. Indicia are provided adjacent graduations correlating with distances away from center holes located at each end of the bar. A series of marking holes are provided at various distances away from the center holes. Thus, when a pin is provided through one center hole, a marking tool can be placed within a marking hole having a distance corresponding with a radius of a curve to be formed, and the bar can be rotated about the pin in the center hole while the marker is allowed to form a mark in an underlying workpiece. The straight edges of the tool can also be utilized for forming straight edges.

Claims20

Dependent claims

A tool for forming portions of a circle, comprising in combination:

an elongate rigid mass of material extending from a first end to a second end opposite said first end;
a pivot hole adjacent said first end adapted to receive a pivot element therethrough;
a plurality of marking holes spaced from said pivot hole at varying distances from said pivot hole;
said marking holes sized to receive a marking tool passing therethrough;
and
indicia adjacent said marking holes corresponding to measurement of a distance of said marking holes from said pivot hole.

3 more elements

A method for forming a circular segment in construction of a portion of a structure, the steps including:

identifying a tool having an elongate rigid mass of material extending from a first end to a second end opposite the first end, a pivot hole adjacent the first end adapted to receive a pivot element therethrough, a plurality of marking holes spaced from the pivot hole at varying distances from the pivot hole, the marking holes sized to receive a marking tool and indicia adjacent the marking holes corresponding to measurement of a distance of the marking holes from the pivot hole;
locating a center point for the circular segment;
selecting a radius for the circular segment;
placing the pivot element through the pivot hole;
anchoring the pivot element at the center point;
orienting a marker passing through one of the marking holes corresponding with the radius of said selecting step;
and
pivoting the tool about the pivot element while marking with the marker.

5 more elements

Dependencies are inferred from the claim text.

Straight edge circle tool

Life of this patent

Straight edge circle tool

Life of this patent

Abstract

Claims20