Abstract: Spray nozzles are frequently used for distributing pressurized fluid onto a surface to be cleaned. The spray nozzle according to the invention is ideally suited for use with a water extraction cleaning machine and for distributing a fan-shaped spray pattern onto the surface to be cleaned. The spray nozzle includes a nozzle body with a fluid flow path extending therethrough. An arcuate deflector plate is provided a spaced distance from the outlet of the fluid flow path. A pinpoint spray of pressurized cleaning solution is directed onto the downwardly and outwardly extending concave deflector surface for creating a fan-shaped spray pattern. The contour of the concave deflector surface can comprise a variety of concave surfaces such as a cylindrical surface, a parabolic surface and a hyperbolic surface. The incorporation of a concave deflector surface is ideally suited for containing and controlling the spray pattern for increasing fluid flow rates and pressures.

Abstract: The invention comprises a cleaning apparatus having interchangeable cleaning solution supply reservoirs, a fluid pump, a vacuum fan, and a removable recovery tank, all cooperatively arranged in a housing of a unique compact design. The cleaning apparatus also includes a hose having separate hand tools which can be adapted for use on appropriate surfaces. Because different cleaning applications require a different cleaning solution to be supplied through the cleaning solution supply reservoir, each interchangeable cleaning solution bottle contains a cleaning solution appropriate for a particular cleaning application. The supply bottles can be quickly and easily changed so that the user may conveniently and efficiently switch between various cleaning applications. This process has the advantage that unused cleaning solution does not need to be disposed of or stored when switching to a cleaning application that requires a different cleaning solution.

Abstract: An accessory crevice cleaning tool adapted for use with a water extraction cleaning machine has a solution spray nozzle integrated therewith and a tapered, rectangular nozzle opening which does not exceed the diameter of the hose and grip tube. The spray nozzle can be adapted to provide a pinpoint spray pattern immediately adjacent the nozzle opening, a fan-shaped spray pattern which is parallel to and aligned with the longitudinal axis of the nozzle opening or a fan-shaped spray pattern which is transverse to and spaced from the longitudinal axis of the nozzle opening. Preferably, the accessory crevice cleaning tool is removably mounted to the end of the flexible hose.

Abstract: A centrifuge holder to inhibit movement of a centrifuge machine caused by a rotor within the centrifuge coming off the drive spindle. The holder apparatus is designed in such a manner that the centrifuge machine can be placed on or removed from the holder without the need of any separate tool. Tab members of the holding apparatus are received within spaced apertures located in the bottom of the centrifuge.