Patent ID: 6877277

Claim:
A coupling for providing an explosion-proof connection between electric line ends, comprising: tubes, wherein the line ends are respectively accommodated in and permanently connected to the tubes, the line ends include plug-in contact parts with contact elements, the contact elements include a contact pin of one of the plug-in contact parts and a contact socket of another of the plug-in contact parts, and the contact pin is for being plugged into the contact socket to provide a conductive connection between the contact elements, a bayonet joint for coupling the tubes to one another in an explosion-proof manner, wherein the contact elements are positioned so that the conductive connection exists while the tubes are coupled to one another in the explosion-proof manner, and the bayonet joint includes: radially outward directed projections carried by an inner tube of the tubes, radially inward directed projections carried by an outer tube of the tubes, a track of the outer tube that is for simultaneously being in receipt of the outward directed projections and allowing relative movement between the outward directed projections and the inward directed projections between: an engaging position in which the outward directed projections and the inward directed projections respectively interact with one another in a manner that restricts the inner tube from being withdrawn from the outer tube, with the outward directed projections and the inward directed projections being in the engaging position while the tubes are coupled to one another in the explosion-proof manner, and an inserting position in which the outward directed projections and the inward directed projections are not arranged with respect to one another in said manner that restricts the inner tube from being withdrawn from the outer tube, a recess adjacent and positioned radially outward of the track, and an elastic body that is adjacent the recess, wherein the track, the outward directed projections and the elastic body are sized and adapted with respect to one another: so as not to impede the inner tube and the outward directed projections from being axially inserted into the outer tube during the inserting position, and so that the elastic body is forced into the recess by an outwardly directed projection of the outwardly directed projections while the outwardly directed projections of the inner tube enter the engaging position.