Compass and compass-cutter with ratchet mechanism

Geometrical instruments – Scriber – Curved line

Reexamination Certificate

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C033S027060, C033S018100

Reexamination Certificate



A manipulator of a compass for drawing a circle or a compass-cutter for cutting an object in circular configuration is provided with a mechanism for transmitting the force from the user's hand only in one direction. With such the construction, a user can smoothly draw a complete circle at 360 degree, or can cut a paper, a cloth and so on in circular configuration, without re-pinching the manipulator during operation, in a manner for a ratchet which is a commercially available tool.

patent: 677339 (1901-07-01), Comstock
patent: 800257 (1905-09-01), Abetz
patent: 2309809 (1943-02-01), Vane
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patent: 2285594 (1995-07-01), None
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