Patent ID: 11945551
Assignee: nan
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 4:
5. The backrest adjustment structure as claimed in claim 3, wherein the restricting member includes a connecting shaft and a handle, the upper bracket is provided with two spaced connecting bases, both ends of the connecting shaft are rotatably connected to the connecting bases, the connecting shaft is provided with a pressing block corresponding in position to the elastic plate and protruding toward the elastic plate, the handle is formed on a top of the connecting shaft, when the handle is rotated to disengage the pressing block from the elastic plate, the elastic plate elastically returns to its natural state, the protruding tooth is disengaged from the tooth groove, and the top of the lower bracket is moved up and down relative to the upper bracket; when the handle is rotated to lean against the upper bracket, the pressing block presses the elastic plate, so that the protruding tooth is engaged in the tooth groove, and the top of the lower bracket cannot be moved up and down relative to the upper bracket.