Abstract: An apparatus for cleaning surfaces by means of a jet of cleaning liquid comprises a sluicing pipe with a housing provided with a tiltably arranged nozzle assembly. The latter is adapted to perform oscillations by means of a hydraulic motor mounted in the housing and driven by the cleaning liquid flowing to the nozzle assembly. The nozzle assembly is located within the housing and comprises at its front end a contact surface, by means of which it is capable of tilting on the bearing surface provided with a discharge opening on a discharge member located at the outlet of the housing. The discharge member comprises a central flow channel for the cleaning liquid, and the discharge opening has a sectional area greater than the hole area of the nozzle assembly. As a result the reliability is increased, as the apparatus is self-adjusting with regard to the wear caused by the movement of the nozzle assembly. The apparatus is furthermore easily assembled.

Abstract: In a sluicing pipe opening into a nozzle tiltably arranged and swinging about an axis perpendicular to the longitudinal axis of the nozzle, oscillating movements of the nozzle are produced by moving means actuatable by cleaning liquid flowing to the nozzle. The moving means may be a spiral, resilient liquid inlet pipe, the nozzle being located at the free end of said pipe. However, the moving means may also be a rotor in a hydraulic motor, the outlet of which communicates with the nozzle or a spring loaded, pivoting means driven by the reaction force of the nozzle. Since the nozzle may oscillate by means of a few and light components, it is suitable for a manually operated, light spray gun.

Abstract: An apparatus for cleaning objects by means of a jet of liquid and comprising an upright pressure tank with a liquid filling pipe extending downwards therein for filling the tank to a predetermined level. The air cushion above the liquid surface is pressurized through valve means at the top of the tank, and the liquid can be forced through a connecting branch to a hose provided with a spray gun. This connecting branch opens on to the tank at a level above the heating means in the liquid. Pressure relief means are provided so that the upper space of the tank is ventilated to the atmosphere before a closing member at the top of the filling pipe is fully opened, so that hot liquid and possibly the closure member itself cannot be ejected by the pressurized tank. Furthermore a safety device arranged between the pressure tank and the spray gun hose ensures that only a limited amount of liquid will flow through if the liquid pressure in the hose falls owing to rupture of the hose wall.