Patent ID: 9366278
Filing Date: 2016-06-14
CPC Classification: F16B,F16L

Claim Text:
1. A male fastening tool to be used to fasten a member comprising: a male fastening tool body including a body part having a male screw portion formed thereon, a flange part which is formed on an upper end of said body part and has a seat surface disposed on a periphery of a lower surface thereof, and an annular concave part formed between said body part and said seat surface of said flange part; and a resinous ring-shaped member disposed at said annular concave part of said male fastening tool body, wherein said annular concave part of said male fastening tool body comprises a main annular concave portion extended from a boundary portion between the flange part and the body part toward the seat surface of the flange part and an annular concave peripheral edge portion which is formed between said main annular concave portion and said seat surface and becomes gradually shallower toward said seat surface; said resinous ring-shaped member fills almost an entirety of said annular concave part and has a surface shape corresponding to said annular concave part, said resinous ring-shaped member being adhered to said annular concave part; said resinous ring-shaped member including, before said resinous ring-shaped member is deformed when said male fastening tool is mounted on said member: i) an annular main part possessing a lower surface projecting downward beyond said seat surface; ii) an annular peripheral part having a tapered bottom surface or a curved bottom surface, which is formed between said annular main part and said outer edge of said resinous ring-shaped member and becomes gradually thinner; and iii) a tapered inner-peripheral side projected part which extends from an inner peripheral portion of said annular main part towards said body part of said male fastening tool body with a diameter of said tapered inner-peripheral side projected part decreasing in the direction away from said annular main part, wherein said tapered inner-peripheral side projected part is in close contact with said annular columnar part of said male fastening tool body; said annular concave peripheral edge portion of said tool body has an annular inclined surface, said resinous ring-shaped member has an upper annular inclined surface to be in close contact with said annular inclined surface of said male fastening tool body and said lower surface projecting downward beyond said seat surface, said resinous ring-shaped member can be deformed not in an outer edge direction thereof, but pressed to a central direction, when said resinous ring-shaped member is pressed from said lower surface side; and wherein said outer edge of said resinous ring-shaped member is not extended to said seat surface and said male fastening tool has an annular concave part formed between an inner edge of said seat surface and said outer edge of said resinous ring-shaped member.