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OwnerHiromichi Mizuno, Masahiko Hamada +2inventors
InventorsHiromichi Mizuno, Masahiko Hamada, Mitsuru Kozawa, Kenya Yamada
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The tapping screw has a screw thread having a non-circular shape. Accordingly, when the tapping screw is screwed into the prepared hole formed in the attached member such as a steel plate, etc., the contact area of the screw thread and the circumferential face of the prepared hole of the attached member can be reduced in comparison with the screw thread having a circular outer shape. Accordingly, the screwing torque can be reduced. Further, since the top portion of the screw thread of the square outer shape has a rising shape without being broken, the biting property of the screw thread with respect to the prepared hole formed in the attached member is improved so that a female screw can be precisely threaded on the inner circumferential face of the prepared hole by the screw thread.
A tapping screw comprising a head portion and a shaft portion extending from said head portion, and forming a female screw in a prepared hole formed in an attached member while the tip portion of said shaft portion is screwed into said prepared hole;
A tapping screw comprising a head portion and a shaft portion extending from said head portion, and forming a female screw in a prepared hole formed in an attached member while the tip portion of said shaft portion is screwed into said prepared hole;
Dependencies are inferred from the claim text.