Ellipsograph drafting apparatus
OwnerRaul Chajon Cortezinventor
Life of this patent
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Abstract
This invention is an ellipsograph drafting apparatus operable to draw ellipses of any desired ratio of major and minor axes limited only by practical size of the device. The ellipsograph drafting apparatus includes a main support means, an elliptical control means, and an intermediate connector means connecting the elliptical control means to the main support means. The elliptical control means includes a marking instrument and actuator assembly which is operable to draw ellipses on a support surface through preselected movement of a pivot arm and slide assembly in a three dimensional manner.
Claims15
An ellipsograph drafting apparatus to draw any ellipse existing within major and minor axes boundaries of a straight line to a circle on a horizontal marking surface, comprising:
- a. a main support means;
- b. an intermediate connector means having a linkage assembly pivotally connected to said main support means and a base support member pivotally connected to said linkage assembly for pivotal movement about a vertical axis;
- c. an elliptical control means connected to said main support means and said intermediate connector means;
- d. said elliptical control means having a protractor control assembly rotatable about a horizontal axis, a slide and crank arm assembly rotatably mounted to said protractor control assembly, to a pivot arm and slide assembly connected to said slide and crank arm assembly, and a marking instrument and actuator assembly connected to said base support member;
- e. said pivotal arm and slide assembly mounted on said base support member for conjoint movement therewith about the vertical axis and for vertical movement relative thereto;
- f. said slide and crank arm assembly having a connector member pivotally connected to a pivot member of said pivot arm and slide assembly;
- and
- g. said connector member rotatable about a common central point in planes from 0.degree. to 90.degree. relative to a vertical axis through said central point to cause said pivot member to move identical to said connector member and transmit a vertical projection of the movement of said pivot member onto the horizontal marking surface through said marking instrument and actuator assembly.
Dependencies are inferred from the claim text.