PRZEWOD ZASILAJACY,ZWLASZCZA DO ZAOPATRYWANIA W ENERGIE OBSZAROW ZAGROZONYCH WYBUCHEM,JAK PRZEDE WSZYSTKIM PODZIEMNYCH OBSZAROW OBJETYCH PRACAMI GORNICZYMI

摘要

A duct section serves as part of a supply system for supplying electric power or a pressure medium to a mobile appliance and especially to a mining machine in a mine working where protection against explosion or fire is necessary. The duct section has a wall with a longitudinal slot therein and pick-up engages in the slot to collect the electric current or pressure medium. The slot is sealed with the aid of thin flexible sealing strips held flat against the inner and outer surfaces of the slotted wall. The pick-up is shaped to progressively deflect the strips away from the slotted wall to permit the passage of the pick-up and maintains the interior sealing with the aid of further seals slidable engaging with the slotted wall over the region where the strips are deflected.