Self-supporting ladder with limited angle of spread of supporting uprights - has single rung slidably fitted between parallel main uprights and connected to drive for automatic climbing and descent

摘要

The ends of the movable rung (3) are pref. fixed to sliding carriages or carriages slidable in the uprights (1). Each endface of the rung is mounted on at least two, spaced rollers (4) slidable along respective grooves (5) in the uprights. The drive is pref. provided by an electromotor (6) with its shaft rolling up a belt (7) coupled directly or indirectly to the rung. The motor is connected to the mains or an accumulator. Arrestors are activated when the motor is off. A tool holder (8) is provided in parallel with the rung and slidable up or down. The holder can have, or provide, an electrical connection. ADVANTAGE - Easier to set up in confined space. Saves climbing up and down and carrying tools at the same time.