By means of a suction or vacuuming tool operated with compressed air or compressed gas, when it is deposited, parked, suspended in or on its resting device, the propellant gas is automatically switched off and the suction cross section is closed

摘要

PCT No. PCT/EP95/00243 Sec. 371 Date Jul. 17, 1996 Sec. 102(e) Date Jul. 17, 1996 PCT Filed Jan. 24, 1995 PCT Pub. No. WO95/19730 PCT Pub. Date Jul. 27, 1995A device for extraction of vacuum-cleaned material comprising a propellant nozzle (1) operated by propellant gas that has on a suction side a vacuum tube (4) with vacuum tool (20) on the end for extraction of vacuum cleaned material and on a discharge side is connected to an extraction pipe (9) leading to a suction and filtering system, wherein means (5,6) to automatically trigger a function switching on said propellant nozzle (1) when said vacuum tool (20) is removed from its rest position and that automatically trigger a function switching off said propellant nozzle (1) when said vacuum tool (20) is inserted in its res position into a mounting (7) into which a plunger (6) of a valve (5) controlling the propellant gas slidably projects.