| 摘要 |
Double insulated, electrically energized liquid handling apparatus, usable without a separate ground line connection, e.g. a jet hot water extractor for dispensing and wet vacuum extraction recovery of rug and carpet cleaning liquids, including an electrically insulating container, e.g. of non-conductive material such as plastic, thereby providing a first exterior insulating barrier, which protectively contains a reservoir connected to a delivery pump adapted for connection in turn with an external applicator for pumping, preferably hot, liquid from the reservoir for application to a surface to be cleaned, an electrically isolated delivery motor, e.g. an open coil induction motor, including a rotatably mounted shaft operatively connected for driving the pump, preferably via a pump journal having a leakproof double seal bearing, and insulating mounting structure, e.g. of such non-conductive material, for maintaining the motor both in electrically isolating non-conductive operative relation to the shaft for rotation of the shaft and in electrically isolating non-conductive relation to the reservoir and pump, thereby providing a second interior insulating barrier, and further including an electrically insulated conductive power and return line circuit conduit for energizing the motor with a source of current without a separate ground line, for double insulated operation of the motor, preferably in conjunction with a vacuum extraction recovery tank on the container coupled with a vacuum creating assembly in the container, e.g. for recovery of dispensed liquid, similarly protectively arranged in electrically isolated non-conductive relation to one another and to the delivery motor.
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