Screw with good retaining effect

• Main Authors: ZHANG TIANMING, DU YINGJIE, WEN HONGCHUN
• Format: Patent
• Language: Chinese; English
• Published: 12.09.2023
• 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

The screw with the good retaining effect comprises a head portion and a rod portion, the rod portion sequentially comprises a first threaded rod, a reinforcing rod and a second threaded rod from top to bottom, a first threaded end and a second threaded end are arranged outside the first threaded rod and the second threaded rod respectively, the outer diameter of the first threaded end is larger than that of the second threaded end, and the outer diameter of the second threaded end is larger than that of the first threaded end. The first threaded rod, the second threaded rod and the to-be-fastened piece have the dual-thread clamping effect in the process that the reinforcing rod acts on the to-be-fastened piece, the primary retaining effect on the screw is achieved, meanwhile, the elastic pieces are arranged outside the reinforcing rod, and when the second threaded rod enters the to-be-fastened piece, the elastic pieces have the good clamping effect at the moment, so that the to-be-fastened piece is prevented