Rain Bird Sprinkler Mfg. Corp.

Charles A McMillen

Hans D Christen

Octavian P Dumitrascu

Michael Cherundolo

A drip irrigation tube formed by longitudinally folding an elongated web having thick marginal side portions, and overlapping and sealing the thick marginal sides to form a tube. Discrete emitter elements are disposed at spaced intervals along the web and are formed by embossing or otherwise forming recessed emission grooves in one of the thick marginal edges so as to form a flow path from the inside of the tube to the outside. The emitter elements operate to provide a constant flow rate over a wide range of working pressures by controlled deformation and constriction of size of relatively short emitter passageways formed by a portion of the emission grooves.

Drip irrigation tube

A constant drive nozzle for use in combination with an impulse or impact drive sprinkler includes a tubular nozzle body with a drive orifice and a range orifice formed in its outlet end. The stream issuing from the nozzle is formed into a drive stream portion and a range stream portion by the drive and range orifices. Since only the drive stream portion intercepts the drive spoon of the arm which impacts and rotates the sprinkler body, various diameter range orifices can be used in conjunction with a single diameter drive orifice without affecting the rotational speed of the sprinkler body.

Constant drive nozzle for impulse irrigation sprinklers

A reaction drive sprinkler including an improved drive nozzle assembly for rotating the sprinkler in steps about a water supply standpipe. The drive nozzle assembly comprises a fixed drive nozzle through which an inclined stream of irrigation water is projected for passage through a diverter tube mounted in front of the drive nozzle for movement between forward- and reverse-drive positions. The diverter tube is shifted between the forward- and reverse-drive positions by a spring-loaded, over-center reversing mechanism for slightly diverting the water stream for alternated interruption by a pair of laterally oppositely angled deflector spoons on a pivoting reaction drive arm. More particularly, the diverter tube directs the water stream for cyclic interruption by one of the deflector spoons to rotate the sprinkler stepwise in a forward rotational direction through a selected arcuate path and then shifts the diverter tube to direct the water stream for interruption by the other deflector spoon for stepwise sprinkler rotation in the reverse direction. Axially offset surface discontinuities within the diverter tube interact with the water stream to impart laterally directed forces to the diverter tube during movement between the forward- and reverse-drive positions to prevent the diverter tube from stalling in a neutral or centered position.

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Alta Loma, CA, United States of America

Charles A McMillen