Screw member
AssigneeGC Corporation
InventorYusuke ISHIKAWA
Life of this patent
Estimating the term…
Abstract
For certainly handling a screw member, a screw member 1 includes a male screw 2, and an inner peripheral face of the hole 4 has an engaging recessed part 5 to be engaged with an engaging projected part 11 of a tapered engaging part 10 of a rotary tool 9, and a stepped part 6, said inner peripheral face is parallel or make close to a center axis 7 of the screw member 1 from the head part 3 in a direction of the male screw and from the stepped part 6 in the direction of the male screw, and head part side end edge 8a and an end edge of the stepped part 8b to be engaged with the engaging projected part 11 have an angle of said inner peripheral face being 90±5 degrees with respect to the head part 3 and the stepped part 6.
Claims2
A screw member comprising:
- a male screw;
- a head part;
- and
- a hole formed at the head part, wherein,
- an inner peripheral face of the hole having an engaging recessed part so as to be engaged with an engaging projected part on an outer peripheral face of a tapered engaging part which is a top end part of a rotary tool (driver), and a stepped part,
- and in a section parallel to a center axis of the screw member, the inner peripheral face of the hole is parallel to the center axis of the screw member or make close to the center axis of the screw member from the head part of the screw member to the direction of the male screw and also is parallel to the center axis of the screw member or make close to the center axis of the screw member from the stepped part of the screw member to the direction of the male screw,
- and a head part side end edge of the hole and an end edge of the stepped part simultaneously engaged with the engaging projected part of the rotary tool,
- at the head part side end edge of the hole an angle of the inner peripheral face of the hole and the head part of the screw member is 90±5 degrees and at the end edge of the stepped part an angle of the inner peripheral face of the hole and the stepped part is 90±5 degrees.
Dependencies are inferred from the claim text.