Ellipsograph
OwnerHyoun-Gyu Liminventor
Life of this patent
Estimating the term…
Abstract
Disclosed is an ellipsograph for drawing an ellipse. A base member for defining one side, that is, a base of a triangle, is provided and fixed to a plane of a drawing sheet. A centering section and an ellipse drawing frame are installed at a middle of the base member. An ellipse deriving thread for determining the total length of three sides of the triangle which is used to draw the ellipse is prepared and supported by both ends of the base member and one end of the ellipse drawing frame thereby to form the triangle. The ellipse is drawn by the ellipse drawing frame while the ellipse drawing frame is rotated and linearly reciprocated due to the fact that the ellipse drawing frame is pressed by the ellipse deriving thread against elastic force of elastic spring and biased by the elastic spring against tension of the ellipse deriving thread.
Claims17
An ellipsograph comprising:
- a base member for defining a distance between two foci of an ellipse;
- an ellipse drawing frame disposed above the base member such that it can be rotated and linearly reciprocated;
- a centering section arranged at a lengthwise middle of the base member and along a vertical direction for defining a center of the ellipse and for holding the ellipse drawing frame horizontal;
- an ellipse deriving thread for determining a total length of three sides of a triangle which is used to draw the ellipse, with one fixed side thereof represented by the distance between the two foci of the ellipse, the ellipse deriving thread being supported by opposite ends of the base member and one end of the ellipse drawing frame thereby to form the triangle, the ellipse being drawn by the ellipse drawing frame while the ellipse drawing frame is rotated and linearly reciprocated;
- and
- the base member including:
- a guide,
- a left focus-defining lever, one end of which is linearly movable with respect to the guide,
- a right focus-defining lever, one end of which is linearly movable with respect to the guide, such that the left and right focus-defining levers can linearly slide relative to the guide to adjust the distance between the two foci of the ellipse, which are represented by opposite ends of the left and right focus-defining levers,
- a rack formed on each of inner surfaces of the left and right focus-defining levers,
- a pinion coupled to the centering section at the guide and at a lengthwise middle of the guide such that the pinion meshes with the racks of the left and right focus-defining levers, and
- a pair of fixing pins which define the distance between the two foci of the ellipse, attached to said opposite ends of the left and right focus-defining levers, respectively.
An ellipsograph comprising:
- a base member for defining a distance between two foci of an ellipse;
- an ellipse drawing frame disposed above the base member such that it can be rotated and linearly reciprocated;
- a centering section arranged at a lengthwise middle of the base member and along a vertical direction for defining a center of the ellipse and holding the ellipse drawing frame horizontal, the centering section including:
- a reference plate for holding the ellipse drawing frame horizontal, and
- a centering pin for defining the center of the ellipse, affixed to a lower surface of the reference plate, and
- a center shaft erected on the reference plate such that the center shaft can be freely rotated while being coaxially aligned with the centering pin;
- an ellipse deriving thread for determining a total length of three sides of a triangle which is used to draw the ellipse, with one fixed side thereof represented by the distance between the two foci of the ellipse, the ellipse deriving thread being supported by both ends of the base member and one end of the ellipse drawing frame thereby to form the triangle, the ellipse being drawn by the ellipse drawing frame while the ellipse drawing frame is rotated and linearly reciprocated.
Dependencies are inferred from the claim text.