Apparatus for transferring mechanical motions representing measured quantities

Apparatus for the transmission of mechanical motions representing measured quantities between an explosion-proof space and an explosion-hazarded space for measuring and control purposes, with electrical components subject to the action of electrical energy and with mechanical components subject to the action of mechanical energy, the combination comprising a partition for separating said explosion-endangered space from said explosionproof space, said partition having a bore with a substantially circular cross-section, a transmission rod with a substantially circular cross-section arranged in a low friction, freely movable manner within said bore to provide a breakdown-proof interconnection between said explosion-endangered space and said explosion-proof space, said electrical components being received in an explosion-proof, pressure-encapsulated first chamber having a wall at least partly formed by said partition, said mechanical components being arranged in the explosion-hazarded space and open to the ambient atmosphere and located in a second chamber, said second chamber being separated from said first chamber by said partition, wherein the transmission rod is tiltably arranged about a tilting point in the passage with the formation of a gap connection.