Pencil marking jig

Claim 1

A pencil marking jig, comprising in combination, a clamp integral with a collar holding a pencil, said clamp being adjustably locked along a calibrated rule of a carpenter's square, and said collar being positioned along an axis perpendicular to a flat plane of said rule, and aligned with one side edge of said clamp wherein said clamp comprises a flat plate with parallel opposite side edges projecting from said plate for providing a groove therebetween receiving said rule adjustably and a set screw through one said edge for locking said clamp at a desired location, including means biasing said pencil vertically towards said plane wherein said means includes a ring slidable in said collar, a pencil extending vertically through said ring, said collar provided with upper and lower stops at the ends thereof to hold said ring therein, a spring affixed in said collar between said upper stop and said ring to urge said ring and pencil downwardly, an elongated slot in said collar and a set screw extending through said slot and threadably engaging a hole in said ring for locking said ring and pencil together.