| 摘要 |
A coupler for releasably connecting an evacuation hose to the exhaust or tail pipe of a motor vehicle to prevent accidental removal of the hose. The coupler comprises a cylindrical rubber body having one end sealingly releasably screwed to the hose and a flexible annular wall partially closing its other end. Radial slits are made through the annular wall which thus defines flexible, resilient triangular flaps. These flaps are provided with radial spacer ribs at their interior and exterior faces. When the body is slipped onto the tail pipe, the flaps are bent inwardly and their exterior ribs frictionally engage the tail pipe. If the body is subsequently pulled to a limited extent the flaps may reverse their bent position but still frictionally engage the pipe by their interior ribs. The flow of combustion gases creates a venturi effect in the main body which induces into the body drafts of ambient air between the the spacer ribs and around the pipe thereby constituting a pressure barrier against excape of combustion gases into the ambient air, and also effecting cooling of the body and of its flaps to prevent heat damage thereto.
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