Self-locking nut having divided and undivided circumferential portions

• Main Author: SHIRAI; KATUTADA
• Format: Patent
• Language: English
• Published: 05.05.1998
• Edition: 6
• Subjects: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL; 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; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; PERFORMING OPERATIONS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; VEHICLES IN GENERAL; WEAPONS

A self-locking nut fitted into a fitting hole of a reflector with which an aiming screw engages for adjusting an inclination angle of a reflector of a vehicular lamp, the self-locking nut comprising: a nut leading portion having slits extending in radius direction; a flange arranged below said nut leading portion; a fitting portion formed below said flange, said fitting portion having slits extending in radius direction and a pair of legs for fitting into the fitting hole of the reflector, said pair of legs being elastically expandable and having a wedge shape; a shaft hole having an inner surface, said shaft hole passing through the nut leading portion, the flange and the fitting portion in vertical direction; and a threaded portion formed on the inner surface of said shaft hole engageable with the aiming screw, the threaded portion comprising: first grooves extending from said slit of said fitting portion; second grooves positioned perpendicular to said slit of said fitting portion; a divided circumferential portion divided in the circumferential direction by said first and second grooves; and an entire circumferential portion having a circular shape in section, said entire circumferential portion being positioned at said fitting portion, wherein a pitch diameter of said entire circumferential portion being slightly smaller than that of the aiming screw.