REVERSE ROTATION PREVENTION STRUCTURE OF SCREW BODY

• Main Author: MICHIWAKI YUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 23.04.2015
• 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 surely prevent rotation of a screw body to a specific direction by a simple structure.SOLUTION: In a fastening mechanism having a screw body 10 and a washer 50 and fastening a fastened body including a first fastened member 80 and a second fastened member 90, a screw body side seat part 22 is formed on the screw body 10, a first receiving part 60 and a second receiving part 70 are formed on the washer 50, and a member side seat part 82 is formed on the first fastened member 80. A first engagement mechanism A is formed between the first receiving part 60 and the screw body side seat part 22, and when the screw body side seat part 22 intends to rotate in a direction for loosing the screw body 10 in a fastened state, the first receiving part 60 and the screw body side seat part 22 are engaged with each other so as to prevent the relative rotation. A second engagement mechanism B is formed between the member side seat part 82 and the second receiving part 70, and when the washer 50 intends to rotate in a direction for loosing the washer 50, a washer side tilt surface 110 and a member side tilt surface 120 are abutted with each other so as to prevent the relative rotation. Thus, loosening of the screw body 10 and the fastened body can be prevented by the functions of the first engagement mechanism A and the second engagement mechanism B. 【課題】簡易な構造で、ねじ体の特定方向の回転を確実に防止する。【解決手段】ねじ体１０とワッシャ５０を備え、第一被締結部材８０と第二被締結部材９０とから成る被締結体を締結する締結機構であって、ねじ体１０にはねじ体側座部２２が、ワッシャ５０には第一受部６０と第二受部７０が、第一被締結部材８０には部材側座部８２が形成される。第一受部６０とねじ体側座部２２の間には第一係合機構Ａが作出され、ねじ体側座部２２が締結状態のねじ体１０を緩める方向に回転しようとすると、第一受部６０とねじ体側座部２２が互いに係合してそれらの相対回転を防止する。部材側座部８２と第二受部７には第二係合機構Ｂが作出され、ワッシャ５０が緩まる方向に回転しようとすると、ワッシャ側傾斜面１１０と部材側傾斜面１２０が当接して相対回転を防止し、これら第一係合機構Ａと第二係合機構Ｂの作用によってねじ体１０と被締結体との緩みが防止される。【選択図】図１