Abstract: A parallel rule which includes a gripper body cover and a rule body, with a gripper body base positioned between them. A plurality of float-contact rollers are installed through respective openings in the rule body and gripper body base. The parallel rule is movable across the paper with only the float-contact rollers contacting the paper, thus minimizing any smearing of drawing ink and the leaving of traces upon the drawing paper. The gripper body cover and an associated end body covers are easily attached and removed from the gripper body base, thus allowing for ease of maintenance.

Abstract: A parallel rule including a rule body, a gripping attachment and two rolling devices which are installed at each end of the rule body. The rolling device has a cylindrical roller and a pair of anchorage portions extending from its end so that the roller is retractable. An opening is provided at each end of the rule body for the roller of the rolling device to project from. By use of the rolling device, the parallel rule is movable.