ACTUATED ROLLER SYSTEMS FOR LADDERS

原文（中国語）

A ladder is provided with a pair of rails, a set of braces or rungs extending between the pair of rails, and a roller assembly with a roller movable, via an electronic actuator, between different positions, such as an extended position and a retracted position relative to the rails. The roller can extend below a bottom end of the rail and any connected foot on the rail so that the ladder can roll across a ground surface, or the roller can be retracted to support the ladder using the rail or foot. Other electronic components can be used to sense a user or a condition of the ladder in order to control the extension and retraction of the rollers based on the user or conditions.