COMBINATION OF SCREW AND DRIVER BIT AND HEADER PUNCH FOR SCREW MANUFACTURING

• Main Author: TOTSU KATSUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2017
• 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; HAND TOOLS; HEATING; LIGHTING; MANIPULATORS; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PORTABLE POWER-DRIVEN TOOLS; THERMAL INSULATION IN GENERAL; TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FORFASTENING, CONNECTING, DISENGAGING OR HOLDING; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a screw capable of attaining a smooth and fast fitting of the screw to a bit fitting groove and capable of performing an effective and positive prevention of occurrence of burr-shaped deformation protrusions at a crossing edge of the bit fitting groove due to stress concentration at the bit fitting groove portion of the screw when a screw fastening work is carried out, a driver bit adapted for this screw and a header punch for manufacturing the screw.SOLUTION: This invention provides a screw (10) forming a bit fitting groove (12) composed of a cross groove at a top surface of a screw head (11a) and forming a slant opening groove part (18) expanding outwardly by a requisite width and inclined downward slightly deep to face toward a center part of a screw axis along a full opening edge of the cross groove at the top surface of the screw head and provides a driver bit adapted for this screw and a header punch for manufacturing the screw.SELECTED DRAWING: Figure 1 【課題】ねじのビット嵌合溝に対する嵌合を円滑かつ迅速に達成することができると共に、ねじ締め作業に際して、ねじのビット嵌合溝部分への応力集中によって、前記ビット嵌合溝の交差縁部にバリ状の変形突起が生じることを、有効かつ確実に防止することができるねじ、およびこのねじに適合するドライバービット並びにねじ製造用ヘッダーパンチを提供する。【解決手段】ねじ頭部（１１ａ）の頂部面に十字溝からなるビット嵌合溝（１２）を形成すると共に、ねじ頭部の頂部面における十字溝の全開口縁部に沿って、外方に所要幅で拡張しかつねじ軸の中心部に指向して若干深めに下方傾斜する傾斜開口溝部（１８）を形成するねじ（１０）およびこのねじに適合するドライバービット並びに前記ねじを製造するヘッダーパンチを得る。【選択図】図１