MALE SCREW MEMBER

• Main Authors: ASANO NOBUYOSHI, HORIUCHI NAOKI, ITO TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 24.10.2019
• Subjects: BLASTING; DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To provide a male screw member capable of being prevented from being inserted obliquely due to a short screw tip shape.SOLUTION: At an end part 21a on the tip side of a shaft part 20 of a complete thread 21, a screw rising part 22 is provided continuously. The screw rising part 22 is configured to gradually rise from a root diameter d1 of the complete thread 21 toward the complete thread 21. A screw tip shape part 30 comprises an annular convex part 40 that bulges outward in a convex arc manner. A maximum diameter d2 of the annular convex part 40 is set to be equal to or less than the lower limit value of the dimensional tolerance of an internal diameter D1 of a female screw.SELECTED DRAWING: Figure 2 【課題】短いねじ先形状によって斜め入りを防止し得るおねじ部材を提供する。【解決手段】完全ねじ山２１の軸部２０の先端側の端部２１ａにはねじの立ち上がり部２２が連続して設けられ、ねじの立ち上がり部２２は完全ねじ山２１の谷径ｄ１から完全ねじ山２１に向けて徐々に立ち上がる構成となっており、ねじ先形状部３０は、外側に凸の円弧状に膨らんだ環状凸部４０を備え、環状凸部４０の最大径ｄ２がめねじの内径Ｄ１の寸法公差の下限値以下に設定されていることを特徴とする。【選択図】図２