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US 8,974,165 B2Granted
Screw
AssigneeKitagawa Industries Co., Ltd.
InventorsHideo Yumi, Yasuo Kondo, Makoto Kato
Life of this patent
Estimating the term…
Abstract
A screw has an outer diameter in a range of 0.3 mm to 1.4 mm. The screw includes resin and carbon fiber which is dispersed in the resin and has a fiber diameter in a range of 0.01 μm to 0.20 μm.
Claims13
A screw comprising:
- resin;
- carbon fiber which is dispersed in the resin and has a fiber diameter in a range of 0.01 um to 0.20 μm;
- wherein the screw has an outer diameter in a range of 0.3 mm to 1.4 mm;
- the carbon fiber has a fiber length of 10 μm to 20 μm;
- the carbon fiber is vapor-grown carbon fiber;
- and
- the carbon fiber has a content of 1 to 15% by weight of the resin.
4 more elements
A minute screw comprising:
- a body having a head at a first end thereof;
- a screw thread formed along an outer surface of an elongate portion of the body;
- the screw thread forming a plurality of thread peaks and roots along the elongate portion in a longitudinal direction;
- the body, the head, and the screw thread being uniformly formed from a molded resin having carbon fibers kneaded and evenly dispersed into the resin;
- the minute screw having an outer diameter of between 300 μm and 1,400 μm;
- the carbon fiber having a fiber length of between 10 μm and 20 μm;
- the plurality of thread peaks each has a thread height of between 20 μm and 90 μm;
- the fiber length being between one and one ninth the thread height so as to improve a strength of each of the plurality of thread peaks;
- and
- a ratio of the fiber length to the outer diameter of the screw is 1/15 to 1/140 so as to improve a bend strength of the screw.
7 more elements
Dependencies are inferred from the claim text.