Universal wheel

A universal wheel, comprising a mounting base, a roller, and a brake lever, wherein

• the roller is rotationally connected to the mounting base, and an annular channel and at least two limiting grooves are provided on one side of the roller near the mounting base;
• a position of the mounting base corresponding to the at least two limiting grooves and the annular channel is provided with an arc-shaped elastic limiting through hole, one end of the arc-shaped elastic limiting through hole serves as a locking position, a second end of the arc-shaped elastic limiting through hole serves as an unlocking position, and a narrowed positioning part is formed between the locking position and the unlocking position;
• and
• a middle position of the brake lever is pivotally connected to the mounting base, with one end of the brake lever serving as a driving part and a second end of the brake lever serving as a clamping part, the clamping part is provided with a brake rod that passes through the arc-shaped elastic limiting through hole, the driving part drives the brake rod of the clamping part to slide and push the narrowed positioning part, enabling the brake rod to switch between the locking position and the unlocking position, when the brake rod is at the locking position, the brake rod enters the at least two limiting grooves from the annular channel, and when the brake rod is at the unlocking position, the brake rod retracts from the at least two limiting grooves back into the annular channel.