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US 6,889,440 B2Granted
Compass and compass-cutter with ratchet mechanism
AssigneeOlfa Corporation
InventorShoji Okada
Life of this patent
Estimating the term…
Abstract
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.
Claims11
A compass for drawing a circle, comprising:
- a first compass leg with a pointed end or defining a center of a circle;
- a second compass leg with a drawing instrument end for carrying a drawing instrument;
- a manipulate portion with which a user transmits a rotational driving force to draw the circle;
- and
- a ratchet mechanism provided to the manipulate portion which transmits the rotational driving force only in one direction;
- wherein the first compass leg and the second compass leg are linked to one another such that a radial distance between the first compass leg point and the second compass leg drawing instrument is adjustable;
- and
- wherein the manipulate portion is coupled to the compass legs via the ratchet mechanism, such that when applied with the manipulate portion, the rotational driving force is transmitted to the compass through the ratchet mechanism to cause the second compass leg to rotate about the circle center defined by the first compass leg point.
5 more elements
A compass-cutter for cutting an object in circular configuration, comprising:
- a first compass-cutter leg with a pointed end for defining a center of a circle;
- a second compass-cutter leg with a blade end carrying a blade for cutting the object;
- a manipulate portion with which a user transmits a rotational driving force to cut the object in the circular configuration;
- and
- a ratchet mechanism provided to the manipulate portion which transmits the rotational driving force only in one direction;
- wherein the first compass-cutter leg and the second compass-cutter leg are linked to one another such that a radial distance between the first compass-cutter leg point and the second compass-cutter leg is adjustable;
- and
- wherein the manipulate portion is coupled to the compass-cutter legs via the ratchet mechanism, such that when applied with the manipulate portion, the rotational driving force is transmitted to the compass-cutter through the ratchet mechanism to cause the second compass-cutter leg to rotate about the circle center defined by the first compass-cutter leg point.
5 more elements
Dependencies are inferred from the claim text.