FASTENER

• Main Author: MIYAMAE HITOSHI
• Format: Patent
• Language: English; Japanese
• Published: 22.11.2018
• 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

PROBLEM TO BE SOLVED: To provide a fastener which makes reliable mounting possible even when making a notched part of a mounting hole small.SOLUTION: A fastener 10 includes: a head part 20 which is mounted to a member formed of a mounting hole having a shaft hole part and a notched part by rotation and is arranged at a front side of the mounting hole; a shaft part 30 extended from the head part 20; and an engagement part 40 which is expanded toward an outer diameter direction from a shaft part 30 outer circumference and is engaged with a back side periphery of the mounting hole extended in a circumferential direction. Therein, a guide part 50 which has a slant face 51 inclined in a shaft direction of the shaft part 30 so as to be separated from the head part 20 and guides the engagement part 40 to the back side periphery of the shaft hole part is provided on a circumferential end part of the engagement part 40, the slant face 51 is abutted to a margin part of the notch part back side in an inclined state of the shaft part and a circumferential direction angle of the engagement part 40 including the guide part 50 is set to be larger than a circumferential direction angle of the notch part.SELECTED DRAWING: Figure 3 【課題】取付孔の切欠き部を小さくしても確実に取付け可能な留め具を提供する。【解決手段】この留め具１０は、軸孔部及び切欠き部を有する取付孔が形成された部材に回転により取付けられ、取付孔の表側に配置される頭部２０と、頭部２０から延出された軸部３０と、軸部３０外周から外径方向に向けて広がり、かつ、周方向に延出された、取付孔の裏側周縁に係止する係止部４０とを有しており、係止部４０の周方向端部には、頭部２０から離れるように軸部３０の軸方向に傾斜した斜面５１を有し、係止部４０を軸孔部の裏側周縁に導く案内部５０が設けられ、斜面５１は軸部の傾斜状態で切欠き部裏側の縁部に当接し、案内部５０を含む係止部４０の周方向角度は、切欠き部の周方向角度よりも大きく設定されている。【選択図】図３