US Patent No. 9,149,827

POP-UP IRRIGATION SPRINKLER WITH SHOCK ABSORBING RISER RETRACTION SPRINGS


Patent No. 9,149,827
Issue Date October 06, 2015
Title Pop-up Irrigation Sprinkler With Shock Absorbing Riser Retraction Springs
Inventorship Ronald H. Anuskiewicz, San Diego, CA (US)
Assignee HUNTER INDUSTRIES, INC., San Marcos, CA (US)

Claim of US Patent No. 9,149,827

1. An irrigation sprinkler, comprising:
an outer case having an upstream end and a downstream end;
a riser having a downstream end and an upstream end and telescopically extensible from the outer case including a nozzle at
the downstream end of the riser;

a coil spring surrounding the riser and normally holding the riser in a lower retracted position within the outer case, the
coil spring being dimensioned and configured to permit extension of the riser to a raised upper position when pressurized
water is introduced into the outer case; and

a shock absorber comprising at least one spring member;
the shock absorber positioned between a lower-most upstream end of the riser and a rigid structure in the upstream end of
the case for lessening the forces otherwise exerted on the riser during rapid retraction of the riser.