Abstract: The cleaning apparatus in one embodiment is formed by a housing member having a first flexible hose coupled to a first end and a smaller diameter second flexible hose coupled to a second opposite end. A turbine is supported for rotation within the housing member. A flexible drive shaft extends through the second flexible hose and has one end coupled to the turbine for rotation therewith and a second end extending out of the other end of the second flexible hose with a brush coupled thereto. An air blower, which preferably is operated in the vacuum mode, is coupled to the first flexible hose for moving air through the second flexible hose, the housing member, and the first flexible hose for causing the turbine and hence the flexible drive shaft and brush to rotate for cleaning the wall of an air duct with the brush and for removing dust and other matter from the duct. In another embodiment of the apparatus, a separate air motor is employed to rotate the flexible drive shaft and hence the brush.

Abstract: The cleaning apparatus includes a support device for supporting a spray member for receiving and spraying hot liquid onto a surface to be cleaned and a vacuum head for withdrawing liquid and material from the surface by reduced pressure. Also included are a container, a manifold haivng first and second chambers, a pump, and a heat exchanger. The heat exchanger inlet is coupled to the first chamber and a flexible high pressure liquid conduit is coupled to the heat exchanger outlet and to the spray member by way of a control valve. The pump inlet is coupled to the second chamber and the pump outlet is coupled to the first chamber. A return conduit is coupled from the flow control valve to the second chamber. A pressure adjustment valve is coupled to the two chambers for controlling variations of the pressure in the two chambers and hence at the pump outlet.

Abstract: The cleaning apparatus has a liquid spray device and a vacuum head attached to a movable support member. A container is provided for holding a supply of liquid. A liquid pump has its inlet coupled to the container and its outlet coupled to a heat exchanger. The outlet of the heat exchanger is coupled to a high pressure liquid conduit which is coupled to the spray device by way of a flow control valve. A return conduit is coupled from the flow control valve to the container. Two electrically actuated vacuum blowers are provided with the first blower having its inlet coupled to a vacuum tank and its outlet coupled to the inlet of the second blower. The vacuum head is coupled to the vacuum tank by way of a conduit. A switch is provided for completing a circuit to the first blower and by way of a time delay circuit to the second blower whereby when the switch is closed, the first blower begins to operate and after a time delay, the second blower begins to operate.

Abstract: The cleaning apparatus is formed by a housing member having a first flexible hose coupled to a first end and a smaller diameter second flexible hose coupled to a second opposite end. A turbine is supported for rotation within the housing member. A flexible drive shaft extends through the second flexible hose and has one end coupled to the turbine for rotation therewith and a second end extending out of the other end of the second flexible hose with a brush coupled thereto. An air blower, which preferably is operated in the vacuum mode, is coupled to the first flexible hose for moving air through the second flexible hose, the housing member, and the first flexible hose for causing the turbine and hence the flexible drive shaft and brush to rotate for cleaning the wall of an air duct with the brush and for removing dust and other matter from the duct.

Abstract: The cleaning apparatus is formed by a housing member adapted to be inserted into an air duct and which has two spaced apart ports for providing an air flow path through the housing member. A flexible hose has one end coupled to one of the ports and is employed for moving the housing member in the air duct and for providing a passage for the flow of air from or to the housing member. A turbine formed by blades fixedly connected to a shaft is supported within the housing member for rotation about the shaft upon passage of air through the housing member by way of the two ports. An off centered weight is coupled to the shaft for rotation with the turbine for causing the turbine and hence the housing member to vibrate upon rotation of the turbine whereby the housing member may vibrate against the inside wall of the air duct to loosen dust and other matter from in the duct and to facilitate movement of the housing member in the duct.