Beam compass
OwnerFrank D. Wernerinventor
Life of this patent
Estimating the term…
Abstract
A beam compass including a base having a center pivot pin and a bore, and including a portion extending from the base to a center pivot reference point. An elongated beam member is mounted within the bore such that the base is slidably and revolvably adjustable along the length of the beam member. A pencil or pen guide is carried by an outer end of the beam member for guiding a marking instrument. The guide includes a first portion extending from the beam member to a first reference point. The first portion defines at least one aperture. A marking instrument positioned to project through the aperture will engage a drawing surface. An arc or circle traced by rotating the marking instrument relative to the center pivot on the base will have a radius equal to the distance between the first reference point and the center pivot reference point.
Claims12
A beam compass comprising:
- a base having means for receiving a beam member and means for defining a center pivot, and including a portion extending from the base to a center pivot reference point;
- an elongated beam member mounted on the means for receiving, the base being adjustable along the length of the beam member;
- guide means carried by an outer end of the beam member for guiding a marking instrument, the guide means including a first portion extending from the beam member to a first reference point, the first portion having at least one aperture therethrough having a center located at the same radius from a pivot axis defined by the center pivot as the first reference point is from the center pivot reference point.
Dependencies are inferred from the claim text.