SELF-TAPPING SCREW

• Main Author: MATSUEDA YOICHI
• Format: Patent
• Language: English; Japanese
• Published: 31.10.2019
• 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 self-tapping screw capable of improving idling torque due to the shape of a tread.SOLUTION: A self-tapping screw comprises a head 10 and a screw shaft 20, and the screw shaft 20 has threads for fastening while forming a female screw 120 by plastic deformation in a lower hole 102a of a female screw member 102. Among the above threads, threads 2201 to 2203 provided on the head side that finally enters the female screw 120 in tightening are designed to have a diameter larger than the other threads 220 by providing a protrusion 222 on a thread base part 223, thereby increasing idling torque.SELECTED DRAWING: Figure 2 【課題】ねじ山の形状によって、空転トルクを向上させる得るタッピンねじを提供する。【解決手段】頭部１０と、ねじ軸２０と、を備え、前記ねじ軸２０は、めねじ部材１０２の下孔１０２ａに塑性変形によりめねじ１２０を成形しながら締結を行うねじ山を有するタッピンねじにおいて、前記ねじ山のうち、締付け時に最後にめねじ１２０に進入する頭部側のねじ山２２０１〜２２０３を、ねじ山基部２２３に突条２２２を設けることにより、他のねじ山２２０よりも大径とし、空転トルクを高くした。【選択図】図２