As a commonly used tool, trolleys have greatly improved the convenience and efficiency of our lives. In practical applications, trolleys are usually equipped with two types of wheels: fixed wheels and universal wheels. So, how to reasonably configure these two wheels?
The common design of a flatbed trolley usually places the fixed wheels in the front and the universal wheels in the back. This layout is very reasonable in function, because the universal wheels in the back are mainly responsible for controlling the direction, and the force required for turning is less, which is more labor-saving. When the fixed wheels in the front are walking in a straight line, the force of controlling the direction through the arms is less, and it is more flexible when turning. Usually, the trolley is configured with two fixed wheels in the front and two universal wheels in the back. When the trolley needs to be turned, the universal wheels in the back will drive the fixed wheels in the front to turn together with the thrust, so that the turn can be easily completed.
Of course, there are some special cases that require special consideration. For example, baby trolleys usually have universal wheels designed in the front, because this type of trolley is mainly pushed forward and rarely needs to be pulled back. This design makes the baby stroller more convenient when turning. However, due to the influence of thrust, the universal wheel in the front may not be as flexible as the rear one when operating. But because the baby stroller is small in size, it is relatively easy to control.
