Rotary sprinklers
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United States of America Patent
Stats
-
Apr 16, 1991
Issued Date -
N/A
app pub date -
Aug 29, 1989
filing date -
May 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary sprinkler comprises a nozzle outputting a jet axially thereof; a rotor rotatably mounted with respect to the nozzle in alignment with the axial jet and having a surface formation impinged by the axial jet to deflect the jet laterally of the nozzle and to rotate the rotor; and a retarding device having a first surface rotatable with the rotor with respect to the nozzle, a second surface non-rotatable with respect to the nozzle, and a viscous liquid between the first and second surfaces; characterized in that the first surface of the retarding device is a cavity formed in a surface of the rotor opposite to that having the surface formation impinged by the axial jet, and that the second surface of the retarding device is carried by a pin non-rotatably mounted with respect to the nozzle and disposed within the cavity.
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