Patent ID: 9511383
Filing Date: 2016-12-06
CPC Classification: A01G,B05B

Claim Text:
1. A liquid diffuser device for irrigation systems, comprising: a support structure defining a first longitudinal axis with an upper passageway for a liquid jet and a lower tubular body having a substantially transverse bottom wall; a spherical member associated with said bottom wall and having an outer surface with a predetermined average radius of curvature; a deflector member for the liquid jet comprising an upper plate located at a predetermined distance from said upper passageway; and a lower stem designed to be introduced into said tubular body and defining a second longitudinal axis, wherein said stem has an end with a bottom surface designed to interact with the outer surface of said spherical member to allow rotation of said stem relative to said tubular body and nutation of said second axis relative to said first axis, wherein the bottom surface of said stem proximate to said second axis is concave and comprises a first concave surface portion with a first radius of curvature substantially equal to the average radius of curvature of said spherical member to define therewith a relatively broad and substantially uniform mutual contact surface, thereby reducing specific pressure, wear and vibrations between said stem and said spherical member during operation, and wherein said bottom surface further defines a second concave surface portion at an outer periphery of the first surface portion, being connected to said first concave portion by a substantially continuous connection line, said second concave surface portion having a second radius of curvature larger than said first radius to prevent rubbing contact of said second concave surface portion with the outer surface of said spherical member.