Geometrical instruments – Straightedge type – Base attached
Patent
1981-01-14
1982-09-28
Haroian, Harry N.
Geometrical instruments
Straightedge type
Base attached
33454, B43L 1302
Patent
active
043511171
ABSTRACT:
A drawing apparatus includes a base member of rectangular form with front, rear and opposite side margins and an upper surface with a compass rose plate for affixing a drawing sheet thereon and pivotally mounted to the base member upper surface. A carriage frame is positioned generally on the upper surface of the base member and has spaced guide members slidably mounted to the base member side margins and interconnected by a crossbar for coordinated translatory movement. A parallel rule structure is supported by the carriage frame and has first and second drawing bars and first and second links forming an expansible and contractible parallelogram generally positioned atop the compass rose plate. The links are respectively mounted to the spaced guide members of the carriage frame for sliding movement therewith over the compass rose plate and for positioning the parallelogram rule structure at selected locations thereon.
REFERENCES:
patent: 907 (1838-09-01), Steiger
patent: 278010 (1883-05-01), Hanstein
patent: 389472 (1888-09-01), Hopkins
patent: 1440993 (1923-01-01), Hasbrouck et al.
patent: 2073881 (1937-03-01), Ronnquist
patent: 2394619 (1946-02-01), Lenz
patent: 2415277 (1947-02-01), Caston
patent: 2855721 (1958-10-01), Shelly
patent: 3526963 (1970-09-01), Cansmith
LandOfFree
Drawing board apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drawing board apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drawing board apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-394127