Cell-phone head of pressing automatic locking of last item core is rather than axle core

• Main Authors: WEN GUOFENG, HUANG YONGCHAO, LONG JINYUAN, WEI RUYU
• Format: Patent
• Language: English
• Published: 02.09.2015
• Subjects: APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE; DENTISTRY; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE

The utility model relates to an according to the automatic axle core of locking the cell-phone of last item core, it includes the bearing post and presss from both sides needle spare, the lower extreme nestification of bearing post has the meson, double-layered needle spare is embedded in the upper end of bearing post, thereby it realizes with its upper and lower removal of control that the resilient mounting of car needle dismouting is connected to press from both sides needle spare, resilient mounting includes spring and pressing piece, be equipped with first screw on the stalk portion, the upper end that presss from both sides needle spare is equipped with the second screw with a thread to match, first screw thread is established to left-handed screw, the spring housing is in the outside that presss from both sides needle spare upper end. The utility model discloses design into left-handed screw to the pressing piece, the direction of rotation that the direction of pressing from both sides on the needle spare and car needle were screwed up to the pressing piece is opposite, also is exactly opposite with the direction of rotation of bearing post. In the working process, the car is to exerting certain moment of torsion according to the last item core, and the difficult inefficacy that produces is connected to screw glue, and the orientation that produces the moment of torsion can make the car needle, and the grinding is tight more, improves clamping-force and centre gripping moment of torsion, improves dental handpiece's reliability greatly, has lengthened dental handpiece's life.