Handpiece capable of automatically locking by pressing central spindle and central spindle for handpiece

Abstract

The invention relates to a central spindle pressed for automatically locking a handpiece. The central spindle comprises a bearing post and a needle clamping part, wherein the lower end of the bearing post is nested by a meson; the needle clamping part is nested by the upper end of the bearing post, and is connected with a rebound device which is used for controlling the needle clamping part to move up and down to dismantle and assemble a machine needle; the rebound device comprises a spring and a pressing part; a first thread is formed in a handle part; a second thread matched with the first thread is formed in the upper end of the needle clamping part; the first thread is set into a left-hand thread; and the spring sleeves outside the upper end of the needle clamping part. According to the central spindle, the pressing part is designed into the left-hand thread; the direction in which the pressing part is screwed on the needle clamping part is reverse to the rotating direction of the machine needle, namely the direction in which the pressing part is screwed on the needle clamping part is reverse to the rotating direction of the bearing post; the machine needle exerts certain torque on the central spindle in the working process; the thread is connected with glue and does not easily lose efficacy; the machine needle is ground relatively tightly due to the direction of generating the torque; and the clamping force and the clamping torque are improved, so that the reliability of a dental handpiece is greatly improved; and the service life of the dental handpiece is prolonged.

Description

technical field [0001] The invention relates to a mobile phone head and its shaft core which are automatically locked by pressing the shaft core. Background technique [0002] Dental handpiece is a commonly used medical device in the department of stomatology. Its working principle is to use high-pressure air to blow the turbine and then drive the bur to run at a high speed. The speed is usually above 200,000 rpm to cut teeth and remove carious tissues, or Preparation of porcelain teeth, can also be used to polish dentures, etc. [0003] Dental handpieces can be divided into lock-pin dental handpieces and push-type dental handpieces according to the way they hold the burs. The lock-pin dental handpieces lock the burs on the dental handpieces through the locker; Press its back cap to remove the bur. The part of the dental handpiece that clamps the bur is the shaft core, and the pressing shaft core of the push-type dental handpiece is composed of a needle clamping piece, a p...

AI Technical Summary

Problems solved by technology

[0004] The thread design of the pressing part of the existing dental handpiece is usually a right-hand thread design, which is the same as the rotation mode of the bur (clockwise). When the bur rotates at high speed, when grinding teeth, the bur and the pressing shaft will Generate a relative torque, which will affect the glued thread. After working for a long time, the glue will fatigue and fail, resulting in failure of the pressing shaft core and unable to clamp the bur. In severe cases, the bur will be stuck during work. Fly out, causing a serious medical accident

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