A hand-held machine tool 1 with an outlet channel 2 in a tubular connection piece 4 intended for removing chips, dust or similar is connected to an extension hose 8 or the like, by a coupling sleeve 9 at the end of the hose 8, providing, using simple means, a positively locking coupling to the hose or tube or the like, which is particularly secure against being unintentionally released. The hose 8...

A releasable plug-in connector for receiving a tubular plug-in part having a peripheral retaining rib. The plug-in connector consists of a housing having a cylindrical receiving space for receiving the plug-in part, and a separate securing ring made from a hard/resilient plastic material. The ring has retaining edges directed inwardly in the form of an arc of a circle that are pushed apart as the ...