Portable Step and Bridge Ladder, System Porta (1874)

Structure of mechanism

Function

The mechanic Paul Porta, who lived in Milan, applied a ladder for a patent in 1874, which is transported disassembled on a cart.
The individual ladder segments are stuck into each other and rose by means of a winch and more people.
The ladder can be used for various purposes, e.g. for fire-fighting operations, building work or cleaning activities, as a mobile observation tower at war or in a horizontal position as a bridge.
A second winch is used for lifting or lowering of tools, people or furniture.

Collections

Selected historical patents of the Geheimes Staatsarchiv Preußischer Kulturbesitz, Berlin

Permanent links

DMG-Lib