Hose coupling

Claim 1

Hose coupling, particularly for fire extinguishing hoses, whose halves have cam rings which are rotatable relative to hose connection pieces assigned to each said half and whose cams can be made to engage in a bayonet-type locking engagement with an annular groove of said cam ring of the other respective said coupling half, said annular groove being sloped, whereupon the turning of said cam rings causes said hose connection pieces to draw together axially so that sealing rings arranged in their end faces are pressed against one another axially without reciprocal turning and in which said hose connection pieces are adjusted for inner fastening, for which purpose an expandable clamping ring is provided, which holds said hose in contact with the inner wall of the fastening connection piece after its expansion, characterized in that a one-piece fastening connection piece 8 is used which has two sections of different diameter, namely one rear section 28 of a larger inner and outer diameter, which section 28 receives said hose, and a front section 27 of a smaller inner and outer diameter; in that the neck 7 of said cam ring 1 is rotatably attached on said front section 27 with an inner diameter which is constant along said sections; in that said cam ring 1 is held on said front section 27 of said fastening connection piece 8 against movement in the axial direction in a manner allowing it to turn by means of locking means 22; 24 engaging simultaneously in an annular groove 21 of said front connection piece section 27 and in an annular groove 23 in said neck 7 of said cam ring 1, which locking means 23; 24 are employed as particular structural component parts; and in that a springing holding ring 16 catches in an annular groove 30 of said front section 27 of said fastening connection piece 8, which holding ring 16, together with a recess 31 on the end face in said front section 27, forms a shaped annular space for receiving the sealing ring 15 of said coupling on said end face.