| 摘要 |
PROBLEM TO BE SOLVED: To prevent oil from dripping from an extraction nozzle and a hose after completion of extraction by a method wherein the hose and the extraction nozzle are connected with a swivel joint which is connected at its one end with the front end of the hose and is turnable at the other end thereof on a plane being in parallel with the axial direction of the hose. SOLUTION: To an extraction hose 4, an oil checker 62 equipped at its front end with a transparent container 61 shown with a dotted line for confirming that waste oil is correctly extracted during execution of work, an L-shaped duct 63, a swivel joint 74 capable of changing a passage in the perpendicualr circumferential direction, and a valve-equipped female coupler 65 are connected successively. Then, a male coupler 66 connected to the base of an extraction nozzle 3 is detachably attached to the female coupler 65. At completion of an extraction work, the extraction nozzle 3 is removed from the swivel joint 74 and returned to a nozzle stand, and the female coupler 65 is turned with its mouth facing upward and its valve being closed. Thereby, waste oil sticking to the outside of the valve of the female coupler 65 is prevented from dripping, and dripping of waste oil onto a floor surface is completely prevented.
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