Drawing instrument

Abstract

A drawing instrument comprises a pair of limbs pivoted together at their inner ends to form an assembly. A bow top has an interior hole and fork limbs embracing the assembly of the inner ends of the pivoted limbs. The fork limbs include pivot holes for receiving the pivot which connects the pivoted limbs to the bow top. A centralizing member is held between and is keyed to the inner ends of the pivoted limbs. A portion of the centralizing member projects upwardly into the interior hole of the bow top. The centralizing member includes an elongated pivot receiving hole. The centralizing member is effective to press against a side wall of the hole in the bow top to cause the bow top to turn and keep central upon any angular movement of one of the pivoted limbs with respect to the other pivoted limb. The bow top includes locating means cooperable with the inner ends to prevent movement of the inner ends toward the bow top beyond a position in which the pivot receiving holes in the inner ends and the bow top are aligned for receiving the pivot. This movement is prevented during the assembly of the instrument with the centralizing member being keyed in place between the inner ends of the two pivoted limbs which are positioned together, side by side, but before the installation of the pivot.

Dependencies are inferred from the claim text.