The hand wound trailer landing legs are a telescopic type operating on the screw jack principle. The leg comprises a length of hollow section which forms the fixed upper section and a second length which telescopes inside it to form a retractable lower section.
The legs are lowered or raised manually by winding with a handle attached to a drive shaft. This is at the near side of the semi-trailer. The drive is transmitted to both legs by a cross shaft which in turn drives a vertical screw within the leg via gears.
