Patent ID: 8172273

Claim:
A sealing arrangement for a coupling for coolant lines, the coupling including a first coupling piece connected seal tight to a first line end piece; a second coupling piece connected seal tight to a second line end piece; said first and second coupling pieces having first and second bores, respectively, and said first and second bores communicating with said first and second line end pieces, respectively; a single screw joining said first and second coupling pieces so as to cause said first and second line end pieces to communicate with each other via said first and second bores; said first and second coupling pieces having first and second sealing surfaces facing toward each other; a sealing ring disposed between said first and second coupling pieces; a non-compressible body disposed between said first and second coupling pieces at a distance from said single screw which is so configured that a lever action arises when said single screw is manipulated to draw said first and second coupling pieces toward each other with said lever action leading to a uniform pressing of said sealing ring between said first and second sealing surfaces; and, said first and second sealing surfaces extending radially and being laterally offset from said single screw on a side of said single screw facing away from said non-compressible body; and, said sealing arrangement comprising: a plastic cap for holding said sealing ring on the sealing surface of one of said coupling pieces; said plastic cap defining a passthrough bore having a first axial end; said plastic cap having a holding seat at said first axial end projecting into said passthrough bore for fixing said sealing ring in its position between the sealing surface of said one coupling piece and said holding seat and said plastic cap remaining in place with said sealing ring until disassembly of said coupling; said plastic cap having an appendage wherein at least one predetermined breaking location configured as a groove is formed whereat the material thickness of said appendage is reduced so as to cause the integrity of the material at said predetermined breaking location to be maintained during assembly with application of a first force while permitting said plastic cap to break apart during disassembly when a second force is applied to said plastic cap greater than said first force so as to cause said sealing ring to fall out of said plastic cap and to preclude reuse of said plastic cap and inadvertent reuse of said sealing ring; said passthrough bore having a longitudinal axis; said appendage extending substantially in a plane transverse to said longitudinal axis of said passthrough bore; and, said appendage having an aperture formed therein for accommodating said single screw.