Drawing compass
First Claim
Patent Images
1. A drawing compass, comprising:
- (a) an arm having a cylindrical portion and an elongated bar portion;
(b) an elongated handle;
(c) a marking instrument attached on said handle;
(d) a pivot pin holder slidably mounted on said bar portion of said arm; and
(e) means for rotatably mounting said handle on said cylindrical portion of said arm;
whereby the handle can freely rotate along the longitudinal axis;
whereby the elongated bar portion of the arm can freely rotate along the longitudinal axis of the handle.
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Abstract
A drawing compass with a structure of L shape and a method of using the same provide improved single-hand manipulation and handling of drawing an arc or circle. The drawing compass comprises a handle rotatably mounted on one end of an arm and a pivot pin holder slidably mounted along the arm. One can make an arc or circle by simply holding the handle perpendicular to a drawing surface, placing the pivot pin at the center and making a circular motion guided by the arm of the compass. In the drawing process, the pressure applied on the marking point is directly controlled by hand. The compass is easy to use, inexpensive, and simple to manufacture.
22 Citations
20 Claims
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1. A drawing compass, comprising:
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(a) an arm having a cylindrical portion and an elongated bar portion;
(b) an elongated handle;
(c) a marking instrument attached on said handle;
(d) a pivot pin holder slidably mounted on said bar portion of said arm; and
(e) means for rotatably mounting said handle on said cylindrical portion of said arm;
whereby the handle can freely rotate along the longitudinal axis;
whereby the elongated bar portion of the arm can freely rotate along the longitudinal axis of the handle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A drawing compass, comprising:
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(a) an elongated arm;
(b) an elongated handle;
(c) a pivot pin holder slidably attached along said arm, said pivot pin holder having a pin with a pointed end;
(d) a marking instrument mounted on said handle; and
(e) means for rotatably mounting said handle on one end of said arm;
whereby the arm can freely rotate along the longitudinal axis of the handle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for using a drawing compass, the method comprises the steps of:
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providing a compass having an arm, a handle rotatably mounted on one end of the arm, a marking instrument mounted on the handle, a pivot pin holder having a pin with a pointed end and securing means securing the pivot pin holder on the arm at a desired position;
providing a marking surface;
placing the pointed end on the marking surface;
placing the marking instrument on the marking surface;
placing the handle substantially perpendicular to the marking surface;
applying pressure on the marking instrument through the handle;
moving the marking instrument in a circular motion to produce a marking line on the marking surface.
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Specification