Sistema de despliegue para subir y bajar una escalera ,comprende largueros laterales y soportes transversales;un mecanismo de accionamiento para desplazarla entre una posición elevada y otra baja,con dispositivos de guía fijos que soportan la escalera en dos o más lugares separados a diferentes alturas ,mientras se desplaza en relación al dispositivo de guía

A ladder deployment system for raising and lowering a ladder (10) includes a ladder having side rails (14, 16) and transverse treads or rungs (18) extending between said side rails, an actuator mechanism (44, 46) which moves the ladder between a raised and lowered positions and stationary guides (34, 36) which supports the ladder at two or more spaced apart locations at different heights, while said ladder translates relative to the guides. The deployment of the ladder between its raised and lowered positions includes a generally vertical translation of the ladder and a further tilting motion.