A device rack with a braking function includes a base, a column tube, a mounting member, a plurality of universal rolling members and a brake member telescopically and movably arranged to form the device rack with a braking release state and a braking state. The base achieves centered braking on the support surface by controlling the linked brake member, which facilitates a user to adjust operating state of the device rack to switch between a rotatable and translatable braking release state and a rotatable-only braking state.

A working machine may include a first ground-contact part, a driving part configured to drive the first ground-contact part, a clutch mechanism configured to be switched between a transmission state and a non-transmission state, a clutch operation part configured to switch a state of the clutch mechanism, a braking mechanism configured to be switched between a braking state and a non-braking state, and a braking operation part configured to switch a state of the braking mechanism. In a case where the state of the braking mechanism is the braking state, the clutch mechanism may be switched from the transmission state to the non-transmission state by operating the clutch operation part, and in a case where the state of the braking mechanism is the non-braking state, the clutch mechanism may not be switched from the transmission state to the non-transmission state even by operating the clutch operation part.

An electric mini push cart provided includes a cart frame, an operation platform, a bucket, and a hydraulic power device. The operation platform arranged on the rear side. The bucket is configured to load objects and located on one side of the operation platform. The hydraulic power device drives the bucket to turn over, the hydraulic power device is installed on the cart frame and located below the bucket, the hydraulic power device includes a piston rod connected to the first end. When the hydraulic power device is working, the piston rod is stretched or retracted to push or pull back the first end, so that the bucket turns around the second end, and moves away from the operation platform or falls back towards the operation platform.