GB1237665A - Improvements in irrigation systems - Google Patents

Abstract

1,237,665. Irrigation system. McPHERSON'S Ltd. 27 Jan., 1970, No. 3770/70. Heading A1D. An irrigating water line 5 is made up of pipe sections 6, having spray nozzles 7, connected by flexible couplings, and is supplied with water from a hydrant 10, about which the line can pivot. The line 5 is supported on wheeled carriages 8 which allow it to be moved around a field. An endless cable 15 lies round the perimeter of the field, held taut round pulleys 12 and 14 anchored to the ground, and having attached to it at 16 a short cable 19 bearing a pulley, round which passes a main drag cable 19A which is attached at one end to the free end of the water line at 23, passes through eye bolts attached to each carriage 8, and has its other end attached to a swivel coupling 21 at the hydrant 10. The cable 15 passes round drums 24, 25, and is moved axially by means of a stationary prime mover 26 which drives the drum, thus causing the water line to swing about the end at the hydrant 10. In an alternative arrangement the short cable 19 is attached to a prime mover which draws itself along a stationary cable secured round the perimeter of the field. In a further embodiment the water line 5 is attached by both its ends to a doubled endless cable extending and moving round only part of the perimeter of the field, for example, three sides of a rectangle. The line is thus moved transversely of its length from one end of the field to the opposite end, being fed with water, via a flexible hose, from a convenient source at the side of the field. The flow of water from the spray nozzles 7 may be automatically controlled by means of cocks actuated by levers connected by a trip wire actuated by devices secured to the ground in appropriate positions.