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US 7,383,635 B1Granted
Multipurpose drawing tool
AssigneeLearning Resources, Inc.
InventorJ. Bruce Stoneberg
Life of this patent
Estimating the term…
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AssigneeLearning Resources, Inc.
InventorJ. Bruce Stoneberg
Estimating the term…
A multipurpose drawing tool is provided. One embodiment of the tool that is advantageous for drawing circles one-handedly includes a protractor portion and an elongated radius arm portion. The protractor portion includes an aperture, and a securing member is rotatably mounted in the aperture. The securing member may be a transparent or translucent suction cup for releasably attaching the tool to a drawing surface such as a vertically-oriented dry-erase or chalk board. Alternatively, the securing member may be a transparent or translucent magnet or a conventional magnet configured with a generally annular or toroidal shape. In another embodiment, an improved protractor is provided that includes a straightedge portion, a semicircular portion, a pivot arm and a suction cup or magnet securing member that pivotally secures an end of the arm to a central portion of the straightedge portion.
An improved drawing tool including a protractor portion, an elongated radius arm portion extending from the protractor portion and having an opening for receiving a writing instrument for pressing through the opening onto a drawing surface, and an aperture bridging an intersection of the protractor portion and the elongated radius arm portion,
A drawing tool comprising:
An improved protractor including a straightedge portion, a protractor portion extending arcuately between ends of the straightedge portion, and an arm having a first end with an aperture, the arm being pivotally mounted at the first end to a center of the straightedge portion,
Dependencies are inferred from the claim text.