Geometrical instruments – Scriber – Curved line
Patent
1988-09-29
1990-02-13
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
33565, B43L 904
Patent
active
048994499
ABSTRACT:
This invention relates to a novel design of a drafting instrument capable of assisting in the accurate drafting of arches, circles, as well as the measurement of angular relationships, and the like, whereby a base plate defines a circular opening having a cover plate symmetrically positioned about the perimeter of the opening formed in said base plate, there being symmetrically positioned about the center of the opening formed within the base plate a series of gear members such that upon the placement of a templet member whose dimensions are such as to have its perimeter come into mechanical contact with each of the gear members there is achieved a unique and novel means of positioning the templet member about the surface of a drawing while providing a mechanically accurate means to rotate said templet member about its center axis. By utilizing a templet having pre-conceived openings formed through its surface capable of receiving the point of a pencil or pen, there is achieved a means to accurately draw upon a surface arches, circles, and the like, as well as to achieve the measuring of angular relationships.
REFERENCES:
patent: 2624117 (1953-01-01), Paci
patent: 2958132 (1960-11-01), Haptbauer et al.
patent: 4175330 (1979-11-01), Hermann
LandOfFree
Drafting instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drafting instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drafting instrument will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1158749