Patent ID: 8734109

Claim:
A foldable electric fan, comprising: a fan head; a support tube; a base; and a turnover mechanism provided between the support tube and the fan head for turning the fan head up or down; wherein said support tube comprises at least two erect tubes and at least two height-adjusting tubes engaging with the at least two erect tubes respectively; wherein said turnover mechanism is connected between a top of said at least two height-adjusting tubes and the fan head; wherein said turnover mechanism comprises a connecting block connected on the top of the at least two height-adjusting tubes and a fan head joining tube connected on a middle part of the top of said connecting block, wherein a plurality of axes are provided on both sides of said connecting block respectively, and each of the plurality of axes through a hole on the height-adjusting tube and then hinge connected with a nut; wherein an automatic position-limit and locking mechanism is provided on the top of the connecting block and the height-adjusting tube to limit and lock said turnover mechanism wherein said automatic position-limit and locking mechanism is a pawl ratchet assembly installed between an end of the connecting block and the height-adjusting tube, the pawl ratchet assembly including: a pivot on the end of the connecting block passing through a center hole of the ratchet; and a mounting hole on the top of the height-adjusting tube sequentially, and then connects with a nut, wherein the pawl engaging with the ratchet is configured between the end of the connecting block and the ratchet; a rotatable handle is fixedly jointed on the outside of the pawl; and a V-shape spring providing the elastic resilience of the pawl is configured between the connecting block and the pawl.