Device at mutually lockable first and second parts

Claim 1

An improved coupling device for providing a fluid-tight connection between a source of fluid and a hollow conduit unit having an enlarged cavity for receiving said coupling device, and comprising: a first coupling member having a fluid passageway extending therethrough; a second coupling member having a fluid passageway extending therethrough; said first and second coupling members each having on a respective first end portion thereof means for permitting insertion of said second coupling member into said first coupling member, thereby aligning said flow passageways extending therethrough; at least one sealing ring means compressed between confronting surface portions of said first and second coupling members for preventing the flow of fluid between said coupling members while simultaneously surpressing the transmission of vibrations through said coupling device; said first coupling member further having on a second end portion thereof means for permitting free insertion of said first coupling member into an enlarged cavity in a hollow conduit unit until said second end portion abuts a portion of an end wall of said enlarged cavity and an exterior surface portion of said first coupling member is radially spaced from a surface portion of said enlarged cavity a distance sufficient to create a substantially cylindrically-shaped slot therebetween; at least one additional sealing ring means contacting said abutting portions of said first coupling member and said enlarged cavity for preventing fluid from leaking therebetween; a hollow nut assembly including on a first portion thereof means for permitting insertion of said nut assembly into said cylindrically-shaped slot a sufficient distance such that an end surface of said hollow nut assembly abuts a radially extending wall portion of said first coupling member and a second end portion of said hollow nut assembly overlaps and faces a substantially radially extending end wall of said first coupling member, defining a circumferentially extending locking slot therebetween; said hollow nut assembly including attachment means engaging complimentary attachment means formed on said hollow conduit unit for fixedly positioning said hollow nut assembly within said substantially cylindrically-shaped slot; a substantially ring-shaped locking member formed of resilient material extending partially into said circumferentially extending locking slot and confronting a circumferentially extending stop assembly formed on an exterior surface of said second coupling member; and said second end portion of said hollow nut assembly including wall means for engaging and biasing said substantially ring-shaped locking member into tight frictional contact with said stop assembly, thereby preventing inadvertent withdrawal of said second coupling member from said first coupling member.