Drafting compass
First Claim
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1. A drafting compass for drawing a geometric shape upon a surface, the compass including a shaft assembly with a first end and a second end, the first end of the assembly being in contact with the surface, the shaft assembly operable as a bearing axis, the compass comprising:
- a soft tip forming the first end of the shaft assembly;
a rotatable knob forming the second end of the shaft assembly;
a rotatable barrel between the soft tip and the knob;
an arm extending from the barrel perpendicular to the bearing axis defined by the shaft assembly;
an instrument block slidably mounted on the arm, the block selectively secured along the length of the arm; and
wherein the instrument block is adaptable to secure one of a variety of distinctly sized writing instruments in contact with the surface to be drawn upon.
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Abstract
The invention relates to drafting equipment and, more particularly, pertains to a new and improved drafting compass for use with brittle or delicate surfaces. The drafting compass includes an arm rotatable about a bearing axis or axis of rotation. An instrument block is selectively securable along the length of the arm, and the block includes means to selectively secure writing instruments of various sizes.
32 Citations
21 Claims
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1. A drafting compass for drawing a geometric shape upon a surface, the compass including a shaft assembly with a first end and a second end, the first end of the assembly being in contact with the surface, the shaft assembly operable as a bearing axis, the compass comprising:
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a soft tip forming the first end of the shaft assembly;
a rotatable knob forming the second end of the shaft assembly;
a rotatable barrel between the soft tip and the knob;
an arm extending from the barrel perpendicular to the bearing axis defined by the shaft assembly;
an instrument block slidably mounted on the arm, the block selectively secured along the length of the arm; and
wherein the instrument block is adaptable to secure one of a variety of distinctly sized writing instruments in contact with the surface to be drawn upon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A drafting compass for drawing a geometric shape upon a surface, the compass including an axis of rotation, an arm extending perpendicularly from the axis of rotation, and a writing instrument supported on said arm, the compass comprising:
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a threaded shaft defining the axis of rotation, the shaft having a first end and second end;
a soft tip fixed to the first end of the shaft, the first end of the shaft in contact with the surface to be drawn upon, the tip operable as a cushion between the threaded shaft and the surface;
a rotatable barrel positioned on the shaft proximate to the tip, the arm extending from the rotatable barrel;
a knob securely threaded onto the second end of the shaft;
a nut located between the knob and the barrel; and
wherein the manual rotation of the knob is transmitted via the nut to the barrel to cause the rotation of the barrel about the threaded shaft. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification