Extraction apparatus

An extraction apparatus comprising first and second portions, the first portion defining an interior for receiving a portion of a rotary tool element having an axis of rotation and having an open end defining an opening through which the rotary tool element extends and having a peripheral edge which bounds the opening and defines a contact face for engagement with and sliding movement over a surface;

• wherein said first portion is rotatable relative to the second portion for angular movement between two opposed positions whilst the first and second portions are configured to define a flow path for fluid communication during said angular movement between the two opposed positions whereby fluid can flow from the interior of the first portion into the second portion at any angular position between the two opposed positions;
• wherein said first portion is rotatable relative to the second portion about said axis of rotation of the rotary tool element for enabling said contact face to maintain engagement with the surface during said sliding movement of the contact face over the surface;
• wherein the first and second portions are configured to define a slidable coupling providing the fluid flow path, the slidable coupling being adapted to accommodate said angular movement between the first and second portions;
• wherein the slidable coupling comprises a first coupling section and a second coupling section slidable one with respect to the other, the second coupling section being hollow to define an open interior, and the first coupling section defining a duct opening onto the interior of the second coupling section, whereby the duct and the interior of the second coupling section cooperate to define the fluid flow path;
• and
• wherein the first coupling section is configured as a tubular section defining the duct, and the second coupling section is configured as a sleeve section, the tubular section being slidably received in the sleeve section, whereby the slidable coupling is operable to undergo extension and contraction in a telescopic manner.