Abstract: A chamber (1) for hardening building materials comprises sheet metal elements which are insulated from one another and are built on a base plate (5) and which form walls (2) and a ceiling (3). The chamber can be manufactured and operated inexpensively and is suitable both as a curing chamber for concrete blocks and for building materials cured with CO2. To this end, it is proposed that the walls (2) and/or ceiling (3) consist of self-supporting, double-walled sheet metal elements (4) connected to one another in an essentially gas-tight manner, and that the double-walled sheet metal elements (4) of the supply and/or discharge and distribution a gaseous hardening medium from outside the chamber (1) into its interior.

Abstract: A spray extraction nozzle for taking in liquids which have been applied to a surface includes a suction duct which ends in a suction mouth, and a spray nozzle, as well as an adapter for working on surfaces which have different properties. The adapter is connected to the spray extraction nozzle through a pivot axis, and the adapter can be pivoted from a position of rest which is remote from the suction mouth to a position of operation in front of the suction mouth of the spray extraction nozzle.

Abstract: A battery-operated hand vacuum cleaner includes a drive part which has a housing, wherein a handle is integrally formed onto the housing and the housing contains an electric motor for a blower, and an intake part with an air inlet, wherein the intake part is separable from the drive part. The drive part contains a tank for containing a liquid, the intake part is provided with a spray nozzle for the liquid, and separable means connecting the tank and the spray nozzle are provided for discharging the liquid.

Abstract: A vacuum cleaner with a steam generator and a source of water under pressure has a suction hose connecting the suction head with the turbine and a dirt collector. Steam and pressurized water lines extend along the hose and the steam line runs to an orifice strip in a sole plate of the head while the spray nozzles are provided in a slot between a pair of brushes. The suction nozzle opens at a slot in the sole plate and sealing strips are provided along the longitudinal sides of the suction nozzle and the steam nozzle strip.