But folding mechanism

The utility model provides a but folding mechanism, relates to machine design technical field for having folding demand and apparatus that need fix a position, corresponding the position on two auricles of ears support and be provided with the ears unthreaded hole, be provided with the monaural unthreaded hole on the auricle of monaural, the bolt passes unthreaded hole and single supra -auricular structure fixed orifices of a set of correspondence on the ears support and laminates the monaural and the auricle of ears support and fix with the nut, be provided with the ring channel on the pin rod of pulling pin, be provided with circlip in the ring channel. The nut is locknut, and the bolt is injectd the nut on the bolt with the backing pin cooperation. The utility model provides a but folding mechanism simple structure, it is convenient to make, and can satisfy outside the folding demand of apparatus can also be fast, the accurate positioning, the stability height of mechanism, safe and reliable.