DOUBLE LOCK NUT

• Main Author: YOKOTA YOSHIAKI
• Format: Patent
• Language: English
• Published: 30.06.2014
• 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 double lock nut having better fastening workability and a high locking effect, simply releasing a fastened state, and capable of being repeatedly used and easy controlled over its usage.SOLUTION: This invention relates to a double nut 3 in which a through female threaded part threadably fitted to a fastening bolt 7, a protruded nut 1 having at a small diameter portion a connecting male threaded part 12 having a larger diameter than that of the through female threaded part, a concave nut 2 having, at one side, a through female threaded part threadably fitted to the fastening bolt and at the other side, a connecting female threaded part 22 larger than that of the through female threaded part are connected in pair by the connecting male threaded part and the connecting female threaded part. The thread pitches of the through female threaded part and the connecting threaded part threadably fitted to the fastening bolt are not the same, but different; the hexagonal holding portions of the protruded nut and the concave nut are formed in substantially the same size and the fastening bolt can be threadably fitted to both protruded nut and concave nut.