Drawing tool
AssigneeSafe-T Products, Inc.
InventorJ. Bruce Stoneberg
Life of this patent
Estimating the term…
Abstract
A drawing tool comprising a protractor portion at one end and an elongated radius arm portion extending therefrom, with a pivot disc rotatably mounted in the tool, and an adjustable radius indicator slideably mounted in the radius arm portion, the pivot disc having an open circular pivot point and the adjustable radius indicator having means for automatically resisting unintended indicator movement.
Claims20
A drawing tool comprising:
- a first member adapted to rest against a drawing surface, the first member having an opening for receiving the tip of a drawing instrument for pressing through the opening onto the drawing surface;
- and
- a second member rotatably mounted in the first member, the second member having a circular pivot point comprising a through-opening,
- whereby the tool may be positioned on a drawing surface with the open circular pivot point of the second member aligned over a desired position appearing on the drawing surface and the second member pressed against the drawing surface while the first part is rotated thereabout with the drawing instrument against the drawing surface, to produce the desired markings on the drawing surface.
A compass tool comprising a circular member with holes in its surface and a pivot disc rotatably mounted at the center thereof, the pivot disc having a open circular pivot point comprising a through-opening.
A drawing tool comprising:
- a first member adapted to rest against a drawing surface, the first member having an opening for receiving the tip of a drawing instrument for pressing through the opening onto the drawing surface;
- the first member including an elongated rectangular cavity generally centered on the longitudinal axis thereof, and an adjustable radius indicator mounted in the elongated cavity, the adjustable radius indicator including means for automatically resisting unintended indicator movement;
- and
- a second member rotatably mounted in the first member, the second member having a circular pivot point comprising a through-hole;
- whereby the tool may be positioned on a drawing surface, with the through-hole of the circular pivot point of the second member aligned over a desired position appearing on the drawing surface and the second member pressed against the drawing surface while the first part is rotated thereabout with the drawing instrument against the drawing surface to produce the desired markings on the drawing surface.
Dependencies are inferred from the claim text.