Importance

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Abstract

A rigid water conduit is manifold connected to a rotary swivel connection and receives high pressure water therefrom and supplies the water to a plurality of jet nozzles. The jet nozzles are rotated about an axis offset from the nozzles and reciprocating means are connected to the manifold for reciprocating the manifold and nozzles about the swivel connection. The swivel connection includes a housing with a water inlet adapted to be connected to a water pump with a hollow mandrel rotatable in the housing and connected to the manifold and having an opening in communication with the water inlet. A bearing and a seal are provided between the mandrel and the housing on each side of the opening whereby the mandrel may be easily rotated. A track is positioned generally transverse to the manifold and a carriage movable on the track includes a pivoting support having bearings for supporting the mandrel but allowing movement of the mandrel transverse to the carriage. A lead screw is connected to the carriage for reciprocating the carriage and limit switches are positioned for limiting the extent of travel of the carriage in opposite directions. Air motors actuate the lead screw and rotate the jet nozzles. The jet nozzles include a body having a passageway in communication with the nozzles and are carried by a rotating mandrel in a housing which is in fluid communication with the manifold. Bearings and seals between the mandrel and the housing allow the mandrel to be easily rotated by a motor.

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First Claim