The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 1990
Filed:
Apr. 10, 1989
Paul Hammelmann, 4740 Oelde 1, DE;
Other;
Abstract
The nozzle device having a plurality of spray orifices comprises a nozzle support rotatably mounted about a rotation axis and drivable by the reaction force of pressurized water issuing from the orifices, whose rotational motion is braked by an eddy current brake, and a stationary housing having a pressurized water connector. The nozzle device may be used with high operating pressures, particularly in cleaning rust and eroding concrete. A seal against these high operation pressures between the stationary parts and the water-guiding rotation parts in the housing is provided. A stationary sleeve with a central passage in the housing extends from the pressurized water connector guiding pressurized water into the central duct of a hollow shaft connected to the nozzle support rotatably mounted in the housing. The central passage widens in diameter relative to the central duct. Between the sleeve and the bounding surfaces of the widened passage a labyrinth-like sealing gap is provided with a plurality of circular or semicircular grooves located in the sleeve which widen the sealing gap on one side.