WO2023084500A1

WO2023084500A1 - A collapsible and portable centre pivot irrigation apparatus

Info

Publication number: WO2023084500A1
Application number: PCT/IB2022/061285
Authority: WO
Inventors: Mojtaba ROSTAMIPOUR
Original assignee: Rostamipour Mojtaba
Priority date: 2022-04-28
Filing date: 2022-11-22
Publication date: 2023-05-19

Abstract

The invention discloses a collapsible and portable centre pivot irrigation apparatus which may be assembled by an operator to be transformed to an irrigating position for irrigating an area in a revolving pattern and may be collapsed to be transformed to a transport position for being transported. The collapsible and portable centre pivot irrigation apparatus comprises a collapsible centre pivot support structure, at least one wheeled chassis, a connection tube and a collapsible elongated boom which includes a collapsible elongated water distribution conduit. The processes of transporting, assembling, operating and collapsing the irrigation apparatus may repeatedly be done for different areas of a field or other fields that are supposed to be irrigated.

Description

collapsible and portable centre pivot irrigation apparatus

Technical Field

[0001] The present invention relates to irrigation systems and, more particularly, to mobile irrigation systems for providing water to agricultural fields. Specifically, the invention relates to a collapsible and portable centre pivot irrigation apparatus which is transformable between an irrigating position for irrigating an agricultural field in a revolving pattern and a transport position for being transported.

Background Art

[0002] Pressurized irrigation methods, including solid and portable systems, have been an integral component of irrigation methods in many parts of the world for several decades.

[0003] Solid systems mainly can be applied as a sprinkler or localized irrigation which involves installing a significant amount of metal, plastic, PVC and PE pipes and fittings to cover the entire agricultural field. This significant amount of pipes and fittings of solid systems poses high installation, operation and maintenance costs, causes inconvenience for agricultural operations and harms the environment due to plastic pollution in vast areas. These disadvantages limit the application of solid systems for small to medium-sized farms in many parts of the world.

[0004] Portable irrigation systems such as conventional linear move, centre pivot irrigation systems, travelling gun irrigation systems and travelling irrigation booms have been devised to compensate for the disadvantages of solid systems. However, each of the mentioned portable irrigation systems has its limitations and weaknesses.

[0005] Though the conventional linear move and centre pivot irrigation systems are generally suitable for flat and large fields, they do not cope well with obstacles or irregularities in the field's surface. The centre-pivot irrigation system also is not suited to smaller areas. The weight of the conventional linear move and centre pivot irrigation systems is hefty, requiring large tires, engines and large amounts of electric power, which needs many cables to operate the device leading to increased overhead costs. The cost of maintenance and spare parts of these systems is high. Bogging and wheel ruts also can be a significant problem due to the high weight of the conventional linear and centre pivot irrigation systems. A problem also exists with moving centre pivot and linear irrigation systems from one field to another. It is generally necessary to dismantle the system entirely to move it from one field to another.

[0006] The travelling irrigation boom is a mechanized irrigation system in which a travelling elongated water distribution conduit (irrigation pipeline) hangs above ground. The water distribution conduit is mounted on a trolley and fed from a long flexible PE hose connected to a large hose reel machine. The hose reel machine includes a reel which is placed on a swivel base mounted on a wheeled cart. When the system operates, the hose is re-winded on a reel, and the water distribution conduit on the trolley is dragged backwards, irrigating a strip until the entire length of the field is covered. The force for dragging the trolley and the connected hose also may be provided by a metal cable attached to the trolley and the cable drum. The travelling gun irrigation system is generally similar to a travelling irrigation boom in which a sprinkler gun is mounted on the trolley in place of the water distribution conduit. One of the main problems with the travelling booms and travelling gun irrigation systems is the heavy weight of the hose reel machine, making it difficult to transport. Also, the long flexible PE hose causes significant water head loss and needs considerable force to be dragged on the soil. Another drawback of the travelling boom and travelling gun irrigation systems is the high precipitation intensity, resulting in a runoff. Another disadvantage, especially for the travelling gun irrigation system, is that it requires high pressure. In addition, another drawback of the irrigation booms and travelling gun irrigation system is that a towing vehicle such as a tractor has to drive a long path into the field to drag the trolley at the end of the field, causing damage to a significant amount of valuable crops.

[0007] As a general disadvantage of the sprinkler irrigation systems, water sprayed by sprinkler nozzles is susceptible to evaporation before reaching the soil. Also, Wind may cause sprinkler patterns to be distorted and cause uneven distribution. By contrast, localized irrigation systems, like drip tube irrigation systems, in which the drip tubes emit water directly onto the soil so that the water is absorbed quickly with little evaporation, are generally more efficient than sprinkler nozzle irrigation systems. As a new method, mobile drip irrigation systems use hanging drip tubes instead of the conventional spray nozzles mounted on mobile irrigation systems. The drip tubes are pulled across the soil to emit water onto the soil for irrigating growing plants directly. It would be advantageous for a mobile irrigation system such as conventional centre pivot irrigation systems or travelling irrigation boom, which may be equipped with drip tubes to operate as a mobile drip irrigation system. This advantage enables these systems to combine the water efficiency of localized irrigation systems with the flexibility and economic benefits of mobile irrigation systems. However, another drawback of other mobile irrigation systems like travelling gun irrigation systems is that it is impossible to equip them with drip tubes.

[0008] Therefore, there is a significant need for an irrigation apparatus to address the previously mentioned issues.

[0009] A mobile centre-pivot irrigation unit disclosed and claimed in U.S. patent application No. 4365748, published Dec. 28, 1982, in the name of EMRICH ROBERT R. in which the irrigation unit has two wheel-mounted irrigation carriages which support a single irrigation pipeline which is suspended between the two carriages. Once connected to a water source, the second carriage wheels are repositioned, and a water turbine powers the second carriage in a circular path about the first carriage as the unit sprays irrigation water onto the field. However, since said mobile centre-pivot irrigation unit is not collapsible, its transportation involves challenges and difficulties. Furthermore, the effective length of said single irrigation pipeline is limited, causing low coverage of the area to be irrigated.

Summary of Invention

[0010] In accordance with the invention, a collapsible and portable centre pivot irrigation apparatus is provided, which is transformable between an irrigating position for irrigating an agricultural field in a revolving pattern and a transport position for being transported. The collapsible and portable centre pivot irrigation apparatus of this invention comprises a centre pivot support structure, a connection tube for connecting said irrigation apparatus to an irrigation hydrant, at least one wheeled chassis, and an elongated boom, which includes a collapsible elongated water distribution conduit. The elongated boom may consist of an elongated inner sub-boom and at least one elongated outer sub-boom. The collapsible elongated water distribution conduit has an inner and an outer end and includes an inner and at least one outer part. Each of the inner and outer parts of the water distribution conduit may be maintained by its associated inner and outer sub-booms. The connection tube connects the irrigation apparatus to an irrigation hydrant which is located proximate to a pivot point of a circular or sector-shaped area of the agricultural field. A plurality of ports may be located along the length of the water distribution conduit for distributing water onto the surface of the field. The inner and outer sub-booms may be of collapsible or non- collapsible types.

[0011] The wheeled chassis comprises a chassis, at least three wheels, a powertrain system that is mounted on the chassis for driving at least one of the wheels, and a control system for controlling the direction and speed of said wheeled chassis. The powertrain system comprises a prime mover for generating mechanical energy and a transmission system for adjusting the mechanical energy of the prime mover according to driving conditions and ultimately transmitting the adjusted mechanical energy to at least one of the wheels.

[0012] In one possible configuration of the irrigating position of the irrigation apparatus, the centre pivot support structure may be located at a pivot point of a circular or sector-shaped area. Then the elongated water distribution conduit may, rotationally, be connected at its inner end to the centre pivot support structure and extend radially outwardly therefrom. The wheeled chassis and the centre pivot support structure support the extended configuration of the elongated boom thereon. The connection tube connects the irrigation hydrant to the irrigation apparatus for supplying the water distribution conduit with water through its inner end. The elongated water distribution conduit distributes water onto the field via the ports along the length of the water distribution conduit while the wheeled chassis move(s) in a self-propelled manner along a circular or arc-like path(s) around said pivot point so as to propel the elongated water distribution conduit around the centre pivot support structure. [0013] In the transport position of the irrigation apparatus, the elongated boom, the centre pivot support structure, and the connection tube may be loaded on the wheeled chassis to be transported.

[0014] A plurality of spray nozzles may be mounted on the ports for spraying water along the length of the water distribution conduit onto the surface of said field. Likewise, a plurality of drip tubes may be mounted on the ports so that the drip tubes emit the water from the ports directly onto the field's soil. Furthermore, an end sprinkler may be mounted at the outer end of the elongated water distribution conduit to increase the coverage of the circular or sector-shaped area to be irrigated or to irrigate non-circular portions of the field.

[0015] The prime mover may be of suitable types, such as an electric motor, an internal combustion engine, a hydraulic turbine, or a compressed air engine. In the transport position of the irrigation apparatus, the wheeled chassis may be transported in a towing position by another vehicle or in a self-propelled manner.

[0016] In the first exemplary embodiment of the invention, the irrigation apparatus comprises a collapsible centre pivot support structure, a wheeled chassis, a connection tube and a collapsible elongated boom, which includes a collapsible elongated water distribution conduit. The collapsible elongated boom consists of an elongated horizontally folding inner sub-boom and an elongated horizontally folding outer sub-boom.

[0017] In the second exemplary embodiment of the invention, the irrigation apparatus comprises a collapsible centre pivot support structure, a first wheeled chassis and a second wheeled chassis, a connection tube and a collapsible elongated boom which includes a collapsible elongated water distribution conduit. The collapsible elongated boom consists of an elongated horizontally folding inner sub-boom, an elongated horizontally folding first outer sub-boom and an elongated horizontally folding second outer sub-boom.

[0018] In the third exemplary embodiment of the invention, the irrigation apparatus comprises a collapsible centre pivot support structure, a wheeled chassis, a connection tube and a collapsible elongated boom which includes a collapsible elongated water distribution conduit. The collapsible elongated boom consists of an elongated vertically folding inner sub-boom and an elongated vertically folding outer sub-boom.

Advantageous Effects of Invention

[0019] Accordingly, it is the primary advantage of the present invention to provide a collapsible and portable centre pivot irrigation apparatus which is transformable by an operator between an irrigating position for irrigating an agricultural field in a revolving pattern and a transport position for being transported.

[0020] A further advantage of the present invention is to provide a collapsible and portable centre pivot irrigation apparatus that is self-propelled. [0021] It is a further advantage of the invention to provide a centre pivot irrigation apparatus which may be used to irrigate small, medium and large fields.

[0022] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus that its application in the field does not involve the installation of a significant amount of pipes and fittings. Hence, it does not pose high installation, operation and maintenance costs, does not cause inconvenience for agricultural operations and does not harm the environment by plastic pollution in vast areas.

[0023] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which is relatively light in weight.

[0024] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which will not cause bogging and wheel ruts.

[0025] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which does not need a large number of cables to operate the apparatus.

[0026] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which may be easily attached to a number of different irrigation water sources.

[0027] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus that may be moved from one field to another without being dismantled.

[0028] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which is easy and economical to operate.

[0029] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which may be used on uneven land.

[0030] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which does not need a long hose for being supplied with water which causes a significant head loss, does not need a hose or a cable to be dragged, and hence, does not need a heavy hose reel-machine.

[0031] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which does not cause a significant runoff.

[0032] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which will not cause damage to a significant amount of valuable crops.

[0033] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which may operate as a mobile sprinkler irrigation system.

[0034] It is a further advantage of the invention to provide a collapsible and portable centre pivot irrigation apparatus which could be equipped with drip tubes to operate as a mobile drip irrigation system and combines the water efficiency of surface drip irrigation with the flexibility and economic advantages of a mobile irrigation system. Brief Description of Drawings

[0035] FIGS. 1A to 1 D generally depict an exemplary agricultural field which may be irrigated by using the irrigation apparatus of this invention and field facilities which may be provided in the field.

[0036] FIGS. 2A to 9E and FIGS. 1 E and 1 F generally depict schematic views of the first exemplary embodiment of this invention.

[0037] FIGS. 10A to 14F generally depict schematic views of the second exemplary embodiment of this invention.

[0038] FIGS. 15A to 21J generally depict schematic views of the third exemplary embodiment of this invention.

[0039] FIG. 1A schematically depicts a plan view of a portion of an exemplary agricultural field that may be irrigated by using the irrigation apparatus of this invention.

[0040] FIG. 1 B schematically depicts a perspective view of a circular area of an agricultural field that may be irrigated by using the irrigation apparatus of this invention.

[0041] FIGS. 1C and 1 D schematically depict a perspective view and a side view of field facilities which may be provided at the pivot point of a circular or sector-shaped area of an agricultural field which may be irrigated by using the irrigation apparatus of this invention.

[0042] FIG. 1 E schematically depicts a perspective view of a centre pivot support structure which is in an erect configuration in accordance with the exemplary embodiments of this invention.

[0043] FIG. 1 F schematically depicts a perspective view of the centre pivot support structure, which is in a collapsed configuration in accordance with the exemplary embodiments of this invention.

[0044] FIG. 2A schematically depicts a perspective view of the circular area being irrigated by means of the irrigation apparatus of the first exemplary embodiment of this invention.

[0045] FIG. 2B schematically depicts a perspective view of the irrigating position of the irrigation apparatus in accordance with the first exemplary embodiment of this invention.

[0046] FIG. 2C schematically depicts a perspective view of one possible configuration of the transport position of the irrigation apparatus in accordance with the first exemplary embodiment of this invention.

[0047] FIG. 2D schematically depicts a perspective view of another possible configuration of the transport position of the irrigation apparatus in accordance with the first exemplary embodiment of this invention.

[0048] FIGS. 3A and 3B schematically depict a perspective view and a rear view of the elongated inner sub-boom, which is in an extended configuration, in accordance with the first exemplary embodiment of this invention. [0049] FIG. 3C shows an enlarged view of a portion of FIG. 3A.

[0050] FIGS. 3D to 3G schematically depict a perspective view, a side view, a plan view and a rear view of the elongated inner sub-boom, which is in a collapsed configuration, in accordance with the first exemplary embodiment of this invention.

[0051] FIG. 3H shows an enlarged view of a portion of FIG. 3B.

[0052] FIGS. 4A and 4B schematically depict a perspective view and a rear view of the elongated outer sub-boom, which is in an extended configuration, in accordance with the first exemplary embodiment of this invention.

[0053] FIG. 4C shows an enlarged view of a portion of FIG. 4A.

[0054] FIGS. 4D to 4G schematically depict a perspective view, a side view, a plan view and a front view of the elongated outer sub-boom, which is in a collapsed configuration, in accordance with the first exemplary embodiment of this invention.

[0055] FIGS. 5A to 5G schematically depict a perspective view and plan views of the processes of unfolding the outer horizontally folding sub-boom.

[0056] FIGS. 6A and 6B schematically depict a front perspective view and a side view of the wheeled chassis of the irrigation apparatus in accordance with the first exemplary embodiment of this invention.

[0057] FIG. 6C schematically depicts an exploded perspective view of the wheeled chassis in accordance with the first exemplary embodiment of this invention.

[0058] FIG. 6D schematically depicts an exploded perspective view of the powertrain system of the wheeled chassis in accordance with the exemplary embodiments of this invention.

[0059] FIGS. 6E and 6F schematically depict a plan view and a perspective view of the prime mover of the powertrain system in accordance with the exemplary embodiments of this invention.

[0060] FIG. 6G schematically depicts a front perspective view of the powertrain in accordance with the exemplary embodiments of this invention.

[0061] FIG. 6H shows an enlarged view of a portion of FIG. 6G.

[0062] FIG. 7A schematically depicts a perspective view of the circular area being irrigated using the irrigation apparatus of the first exemplary embodiment of this invention, operating as a mobile sprinkler irrigation system.

[0063] FIGS. 7B and 7C schematically depict a perspective view and a rear view of the irrigating position of the irrigation apparatus in accordance with the first exemplary embodiment of this invention, operating as a mobile sprinkler irrigation system.

[0064] FIG. 7D shows an enlarged section view of a portion of FIG. 7C.

[0065] FIGS. 7E to 7J show enlarged views of portions of FIG. 7B. [0066] FIG. 8A schematically depicts a perspective view of the circular area being irrigated using the irrigation apparatus of the first exemplary embodiment of this invention, operating as a mobile drip irrigation system.

[0067] FIG. 8B schematically depicts a perspective view of the irrigating position of the irrigation apparatus in accordance with the first exemplary embodiment of this invention, operating as a mobile drip irrigation system

[0068] FIGS. 9A to 9E schematically depict a perspective view, a front view, a side view, an exploded perspective view and an exploded rear view of one possible configuration of the transport position of the irrigation apparatus in accordance with the first exemplary embodiment of this invention.

[0069] FIG. 10A schematically depicts a perspective view of the circular area, being irrigated by means of the irrigation apparatus of the second exemplary embodiment of this invention.

[0070] FIGS. 10B and 10C schematically depict a perspective view and a rear view of the irrigating position of the irrigation apparatus in accordance with the second exemplary embodiment of this invention.

[0071] FIGS. 10D to 10F show enlarged views of portions of FIG. 10B.

[0072] FIG. 10G shows an enlarged view of a portion of FIG. 10B.

[0073] FIG. 10H shows an enlarged view of a portion of FIG. 10C.

[0074] FIGS. 11 A to 11 D schematically depict perspective views and side views of the first wheeled chassis of the irrigation apparatus in accordance with the second exemplary embodiment of this invention.

[0075] FIGS. 11 E to11J schematically depict perspective views, side views, and an exploded perspective view of the first inner sub-boom and first wheeled chassis of the irrigation apparatus in accordance with the second exemplary embodiment of this invention.

[0076] FIGS. 12A schematically depicts a perspective view of the second wheeled chassis of the irrigation apparatus in accordance with the second exemplary embodiment of this invention.

[0077] FIGS. 12B shows an enlarged section view of portions of FIG. 12A.

[0078] FIGS. 12C to12E schematically depict side views and a perspective view of the first wheeled chassis, which is loaded on the support frames of the second wheeled chassis.

[0079] FIGS. 13A to13E schematically depict side views, perspective views and exploded views of the transport position of the irrigation apparatus in accordance with the second exemplary embodiment of the invention.

[0080] FIGS. 14A to 14C schematically depict perspective views and a rear view of another configuration of the irrigating position of the irrigation apparatus in accordance with the second exemplary embodiment of this invention. [0081] FIGS. 14D to 14F show enlarged views of portions of FIGS. 14B and 14C

[0082] FIG. 14G schematically depicts a side view of another exemplary configuration of wheeled chassis and another possible configuration of the transport position of the irrigation apparatus, which comprises two numbers of wheeled chassis.

[0083] FIG. 15A schematically depicts a perspective view of the circular area being irrigated using the irrigation apparatus of the third exemplary embodiment of this invention.

[0084] FIG. 15B schematically depicts a perspective view of the irrigating position of the irrigation apparatus in accordance with the third exemplary embodiment of this invention.

[0085] FIG. 15C and 15D schematically depict a side view and a perspective view of the transport position of the irrigation apparatus in accordance with the third exemplary embodiment of this invention.

[0086] FIGS. 16A schematically depicts a rear view of the elongated inner sub-boom, which is in an extended configuration, in accordance with the third exemplary embodiment of this invention.

[0087] FIG. 16B shows an enlarged view of a portion of FIG. 16A.

[0088] FIGS. 16C to 16E schematically depict a perspective view, a side view and a plan view of the elongated inner sub-boom, which is in the collapsed configuration, in accordance with the third exemplary embodiment of this invention.

[0089] FIGS. 17A schematically depicts a rear view of the elongated outer sub-boom, which is in an extended configuration, in accordance with the third exemplary embodiment of this invention.

[0090] FIG. 17B shows an enlarged view of a portion of FIG. 17A.

[0091] FIGS. 17C to 17F schematically depict a perspective view, side views and a plan view of the elongated outer sub-boom, which is in the collapsed configuration, in accordance with the third exemplary embodiment of this invention.

[0092] FIG. 17G shows an enlarged view of a portion of FIG. 17A.

[0093] FIG. 18A schematically depicts a rear view of the irrigating position of the irrigation apparatus in accordance with the third exemplary embodiment of this invention.

[0094] FIGS. 18B schematically depicts a perspective view of the elongated inner sub-boom, which is in an extended configuration, in accordance with the third exemplary embodiment of this invention.

[0095] FIG. 18C shows an enlarged view of a portion of FIG. 21 B.

[0096] FIGS. 18D schematically depicts a perspective view of the elongated outer sub-boom, which is in an extended configuration, in accordance with the third exemplary embodiment of this invention.

[0097] FIG. 18E shows an enlarged view of a portion of FIG. 18D. [0098] FIG. 18F shows an enlarged view of a portion of FIG. 18B.

[0099] FIGS. 19A to 19G schematically depict perspective views of processes of unfolding the vertically folding outer sub-boom.

[0100] FIG. 19H shows an enlarged view of a portion of FIG. 19G.

[0101] FIG. 20A to 20D schematically depict a perspective view, a rear view, an exploded perspective view and an exploded rear view of the transport position of the irrigation apparatus in accordance with the third exemplary embodiment of this invention.

[0102] FIGS. 21A to 21C schematically depict perspective views of the wheeled chassis of the irrigation apparatus in accordance with the third exemplary embodiment of this invention.

FIGS. 21 D to 21 J schematically depict the process of raising the sub-booms of the third exemplary embodiment of this invention from a horizontal to a vertical position on the wheeled chassis in accordance with the third embodiment of the invention.

Description of Embodiments

[0103] A collapsible and portable centre pivot irrigation apparatus, called irrigation apparatus hereinafter, will be disclosed, which is transformable between an assembled configuration, called irrigating position hereinafter, for irrigating an area in a revolving pattern and a collapsed configuration, called transport position hereinafter, for being transported.

[0104] The numeral 1000 in FIG. 1A indicates a portion of an exemplary agricultural field which may be irrigated by applying the irrigation apparatus of this invention. The agricultural field 1000 may be provided with a pressurized water pipeline network 1001 , being supplied with water from a water source 1002. In addition, the agricultural field 1000 may include one or more circular areas 1003, one or more sector-shaped areas 1004 and one or more non-circular portions 1005. Each circular and sector-shaped area 1003 and 1004 includes a pivot point 1006 around which the irrigation apparatus moves. A perspective view of one circular area 1003 of the agricultural field 1000 is illustrated in FIG. 1 B. FIGS. 1C and 1 D schematically illustrate field facilities which may be provided at the pivot point 1006. The pivot point 1006 is where the water is supplied for the irrigation apparatus from an irrigation hydrant 1007, which may be located next to the pivot point 1006 and connected to the pressurized water pipeline network 1001. The irrigation hydrant 1007 may include a valve 1008. In addition, a slab 1009, which may be made of any suitable material (for example, concrete), may be placed on the surface at the pivot point 1006. The irrigation apparatus of this invention is a “pivot” or a “centre pivot” apparatus because it pivots circularly around the pivot point 1006.

[0105] With reference to exemplary FIGS. 1A to 9E, the first exemplary embodiment of this invention, will be described. The numeral 10 in FIGS. 2A, 2B, 7B and 7C indicates the irrigating position of the irrigation apparatus in accordance with the first exemplary embodiment of the present invention. Also, the numerals 10b and 10c in FIGS. 2C and 2D indicate two possible configurations of the transport position of the irrigation apparatus in accordance with the first exemplary embodiment of the present invention. In the first exemplary embodiment of the invention, the irrigation apparatus 10 comprises a collapsible centre pivot support structure 50, a wheeled chassis 60, a connection tube 20 and a collapsible elongated boom 30, which includes a collapsible elongated water distribution conduit 40. The collapsible elongated boom 30 consists of an elongated horizontally folding inner sub-boom 31 and an elongated horizontally folding outer sub-boom 32. The water distribution conduit 40 has an inner end 401 and an outer end 402. In addition, the collapsible elongated water distribution conduit 40 includes an elongated inner part and an elongated outer part. Each of the inner and the outer parts of the collapsible elongated water distribution conduit 40 is maintained by the elongated inner sub-boom 31 and the elongated outer sub-boom 31 , as best shown in FIGS. 2B and 2D.

[0106] It will be appreciated that the centre pivot support structure may be configured in any suitable construction for supporting, raising and lowering the elongated inner sub-boom 31. For example, the numeral 50 of FIG.1 E indicates one possible configuration of the collapsible centre pivot support structure, comprising a telescopic lifting column 501 and at least three collapsible stabilizer legs 502. The telescopic lifting column 501 may lower and raise the elongated inner sub-boom 31 by applying a suitable mechanism, for example, the mechanism of a conventional hydraulic jack or a screw jack (not shown). The lower end of the lifting column 501 may be equipped with rolling means, for example, a suitable type of caster wheels 503, which enables the centre pivot support structure 50 to be moved on the slab 1009 for being adjusted at the pivot pint 1006. The collapsible centre pivot support structure may be transformable between a collapsed configuration 55 as indicated by arrow 50b of FIG. 1 F and an erect configuration as referred to by arrow 50 of FIG. 1-E. Though in the exemplary embodiments of the invention, the centre pivot support structure is adapted to be supported upon the slab 1009, it will be appreciated that the centre pivot support structure can be adapted to be stable on the ground without needing a slab.

[0107] The elongated inner sub-boom and outer sub-boom may be configured as the configuration of many conventional booms, generally referred to as ‘irrigation booms’. Many conventional irrigation booms, including the collapsible and non-collapsible types, are relatively large in length, for example, around 50 meters. In the first exemplary embodiment of the invention the elongated inner sub-boom and outer sub-boom 31 , 32 may be configured as the configuration of conventional horizontally folding irrigation booms. Hence, the configuration of the conventional horizontally folding irrigation booms may be relied upon to complete the details of the elongated inner and outer sub-booms 31 and 32.

[0108] The numeral 32 in FIGS. 4A to 4C indicates an extended configuration of the elongated horizontally folding outer sub-boom of the elongated boom 30 in accordance with the first exemplary embodiment of the invention. Also, the numeral 32b of FIGS. 4D to 4G indicates an extended configuration of the elongated horizontally folding outer sub-boom. [0109] As shown in FIGS. 4A to 4G, the horizontally folding outer sub-boom 32 may include a middle frame 320, a foldable left-wing 321 and a foldable right-wing 322. The left-wing 321 and the rightwing 322 comprise a plurality of boom sections 323. The middle frame 320, the left-wing 321 and the right-wing 322 maintain the outer section of the foldable water distribution conduit 40, which is extended from opposite sides of the middle frame 320. The water distribution conduit 40 is supported by means of a plurality of supporting cables 325 and a plurality of supporting bars 326, which extended along the length of the outer sub-boom 32. Tension in the members of the middle frame 320, the supporting bars 326, the supporting cables 325 and the water distribution conduit 40 cooperate in providing rigidity for the whole structure of the outer sub-boom 32 and maintaining the water distribution conduit 40 extending longitudinally. Adjacent boom sections 323 have a hinge 327 therebetween (not shown), which. It connects the adjacent boom sections 323 to each other and allows the boom sections 323 to be, horizontally rotated around the hinges 327; thus, the hinges enable the left-wing 321 and the right-wing 322 to be folded and unfolded horizontally. The boom sections 323 may be secured at a determined position by means of a plurality of locking means (not shown). The middle frame 320 may, rotationally, be supported by means of a vertical mast 324, which may be provided with a rotating tube 328, having a support bolt 329, as shown in FIG. 4H. The vertical mast 324 of the outer sub-boom 32 may be supported upon the chassis 60.

[0110] As shown in FIGS. 5A to 5F, the left-wing 321 and the right-wing 322 may, horizontally, be folded and unfolded by an operator in a conventional method to transfer the outer sub-boom between the collapsed configuration 32b and the extended configuration 32.

[0111] The numeral 31 in FIGS. 3A to 3C indicates an extended configuration of the elongated horizontally folding inner sub-boom in accordance with the first exemplary embodiment of the invention. Also, the numeral 31 b of FIGS. 3D to 3G indicates a collapsed configuration of the horizontally folding inner sub-boom. The elongated horizontally folding inner sub-boom 31 is generally configured similar to the elongated outer sub-boom 32 and will not be described in detail. However, the key features and primary differences between the inner sub-boom 31 and the outer part 32 will be described with reference to FIGS. 3A to 3H. The elongated horizontally folding inner sub-boom 31 includes a right-wing 311 , a left-wing 312 and a middle frame 310. The middle frame 310 may, rotationally, be supported using a mast, called central mast 314 hereinafter, which enables the elongated inner sub-boom 31 to be rotated around the central mast 314. As shown in FIGS. 3A to 3G and FIGS. 7D and 7E, the lower end of the central mast 314 may be attached to the upper end of the centre pivot support structure 50. Referring to FIGS. 7E and 7F, the lower end of the central mast may be provided with a water inlet 381. In addition, as best shown in FIG. 7F, the upper end of the central mast may be provided with a rotating tube 318 and a support bolt 319 for supporting the middle frame 310, and a water-sealed swivel joint 383. The water-sealed swivel joint 383 may be connected to the inner end 401 of the water distribution conduit 40 through a flexible pipe 384, as shown in FIGS. 3C and 7D. The swivel joint 383 and the flexible pipe 384 may be rotated around the central mast 314 along with the middle frame 310 while the inner sub-boom 31 is rotated. The water inlet 381 may be connected to the irrigation hydrant 1007 through the connection tube 20. FIG. 7D schematically illustrates how water flows through the irrigation hydrant 1007, the connection tube 20, the tubular body of the central mast 314, the swivel joint 383 and the flexible pipe 384 and finally enters the water distribution conduit from 40 from its inner end 401 .

[0112] Referring to FIGS. 3A, 3B and 7D, in the inner sub-boom 31 , the inner part of the water distribution conduit 40 may just be extended along the length of the right-wing 312, but the leftwing 311 of the inner sub-boom does not include the water distribution conduit 40. The left-wing 311 may act as a counterbalance arm in which a counterweight 386 provides balance and stability to the inner sub-boom 31 , hence keeping the inner sub-boom 31 from tipping over. The counterweight 386 may be configured as a lightweight tank filled with water and suspended at the end of the left-wing 311 of the inner sub-boom 31 as best shown in FIG. 3H. The method of folding and unfolding the inner sub-boom 31 may, generally, be similar to the method of folding and unfolding the outer sub-boom 32, as illustrated in FIGS. 5A to 5G.

[0113] Referring to FIGS. 2B and 7C, in the irrigating position of the irrigation apparatus 10, the elongated inner sub-boom 31 and the elongated outer sub-boom 32 may be connected at their adjacent ends using suitable connection means (not shown) and positioned in a straight line to form an extended configuration of the elongated boom 30. The connection between the elongated inner sub-boom 31 and the elongated outer sub-boom 32 may, horizontally, be rigid. The horizontal rigidity of the connection between the elongated inner sub-boom 31 and the elongated outer sub-boom 32 keeps the longitudinal axes of the boom 30 horizontally in a straight line. It enables the elongated inner sub-boom 31 to be revolved along with the elongated outer subboom 32 around the centre pivot support structure 50 by the wheeled chassis 60 in the irrigating position 10. In the collapsed configuration of the elongated boom 30, the inner sub-boom 31 and the outer sub-boom 32 may be disconnected, as shown in FIGS. 2C and 2D.

[0114] As shown in FIGS. 2A and 2B, the wheeled chassis 60 is arranged to support the elongated outer sub-boom 32 thereon and propel the boom around the pivot point 1006 while the irrigation apparatus is in the irrigating position 10. In addition, the wheeled chassis 60 is arranged to accommodate and carry all collapsible and portable elements of the irrigation apparatus while the irrigation apparatus is in the transport position 10b or 10c, as illustrated in FIGS. 2C and 2D. The wheeled chassis 60 may be configured in any suitable construction. In the first exemplary embodiment of the invention, as illustrated in FIGS. 6A to 6C, the wheeled chassis 60 may have an elongated tricycle-like construction which comprises a chassis 620, three wheels 610a, 610b and 610c engaging the ground surface, and a powertrain system 650 that is mounted on the chassis 620 for driving the front wheels 610a and 610b.

[0115] The chassis may be configured in any suitable construction for accommodating and bearing the weight of all elements of the irrigation apparatus. For example, in the first exemplary embodiment of the invention, as shown in FIGS. 6B to 6C, the chassis 620 may be configured as a lightweight and elongated frame structure which is constructed from hollow metal sections. The chassis 620 has a front end 621 and a rear end 622. The chassis 620 may include a plurality of longitudinal side members 625, a plurality of cross members 626 and a plurality of diagonally extending members 627, which their opposite ends are integrally attached to side members 625 and cross members 626 for adding rigidity to the chassis 620. A space and a platform may be provided at the front part of the chassis 620 for accommodating the powertrain system 650. The chassis is also equipped with a support stand 628 for supporting the mast 324 of the elongated outer sub-boom 32 thereon. The elongated outer sub-boom 32 may be lowered and raised by applying a suitable mechanism, for example, the mechanism of a conventional hydraulic jack or a screw jack (not shown). A pair of side support arms 629 may be attached to both sides of the chassis 620 for supporting the boom sections 313 and 323 thereon in the transport position 10b of the irrigation apparatus, when the inner sub-boom 31 b and the outer sub-boom 32b are in the collapsed configuration, as shown in FIG. 2C and FIGS. 9A to 9E. In addition, a pair of front support arms 630 may be provided at the front end 621 of the chassis 620 for supporting the middle frame 310 of the inner sub-boom 31 while the irrigation apparatus is in the transport position 10b and 10c, as shown in FIGS. 2C and 2D and FIGS. 9A to 9D.

[0116] Referring to FIGS. 6A to 6C, one or more hitch means 632 may be provided at the front end 621 , and the rear end 622 of the chassis 620 for connecting the wheeled chassis 60 to a suitable towing vehicle 80 as shown in exemplary FIG. 2C. The rear part of the chassis 620 may be made narrower so as to lighten the weight of the chassis 620.

[0117] As shown in FIGS. 6A to 6C, the front left wheel 610a and the front right wheel 610b are mounted adjacent to the front end 621 of the chassis 620, and the rear wheel 610c is mounted adjacent to the rear end 622 of the chassis. Though in the exemplary embodiments of the invention, the wheeled chassis 60 is shown to comprise three wheels, it will be appreciated that a wheeled chassis 60 can include more than three wheels. The wheels may be of any suitable type. Though in the first embodiment of the invention, both front left and front right wheels 610a and 610b are arranged to be driven by the powertrain system 650, it will be appreciated that less or more than two wheels may be driven by the powertrain system 650. The front wheels 610a, 610b and/or the rear wheel 610c may be of steerable type.

[0118] A powertrain system is an assembly of every component that pushes the wheeled chassis 60 forward or rearward. As shown in FIGS. 6C, the powertrain system 650 may comprise a prime mover 651 and a transmission system 652. The prime mover 651 converts one or more forms of energy (chemical energy, electrical energy, fluid pressure, fluid flow, etc.) into mechanical energy. The transmission system 652 adjusts the mechanical energy of the prime mover 651 according to driving conditions and ultimately transfers it to the wheels 610a and 610b.

[0119] The prime mover 651 may be of any suitable conventional types. In the first exemplary embodiment of the invention, for example, a hydraulic turbine 653, having an inlet and an outlet 654, 655, is considered as being a representative of such suitable types of prime mover, as shown in FIGS. 6E and 6F. The hydraulic turbine 653 converts the energy of flowing water into mechanical energy by rotating a drive shaft 653. Water to power the hydraulic turbine 653 is supplied from the water distribution conduit 40 and flows through a flexible inlet and outlet hoses 664 and 665, as shown in FIG. 4C. Additionally, as shown in FIGS. 6E and 6F, a bypass 656 around the turbine 663 may be used with suitable valves 657 and 658 to control the flow of water through the hydraulic turbine 653.

[0120] The transmission system may be of any suitable conventional type. In the first exemplary embodiment of the invention, for example, the transmission system 652 may comprise a gearbox 659, a drive chain 660, a differential 661 and an axle shaft 662, as shown in FIGS. 6D, 6G and 6H.

[0121] The gearbox 659, which is connected to turbine 653, takes power from the drive shaft 663 of turbine 653 and adjusts the power according to driving conditions, ultimately transferring it to the differential 661 by means of chain 660. The combined efficiency of the prime mover 651 , the gearbox 659, and the differential 661 would be such that a sufficient tractive force for moving the wheeled chassis 60 would be achieved; hence the wheeled chassis 60 may be moved by the powertrain system 650 in a self-propelled manner while the irrigation apparatus is in the irrigating position 10.As it will be appreciated, the wheels 610a and 610b may be disengaged from the powertrain system 650 by means of a conventional mechanism (not shown). The wheeled chassis 60 of the first exemplary embodiment of the invention is arranged to be towed by a suitable towing vehicle while the irrigation apparatus is in the transport position 10b and 10c. Though in the first exemplary embodiment of the invention, the prime mover is depicted to comprise a hydraulic turbine 653, it will be appreciated that the prime mover 651 might alternatively or additionally comprise an electric motor, an internal combustion engine, a compressed air engine and/or some other suitable types of prime movers. Most of these alternative or additional types of prime mover enable the wheeled chassis 60 to be moved in a self-propelled manner while the irrigation apparatus is in the transport positionlOb or 10c when there is no flowing water.

[0122] The key components of the irrigation apparatus, including the boom 30, the water distribution conduit 40, the chassis 620, the powertrain system 650 and the wheels 610a, 610b and 610c, may be made of any suitable lightweight material such as light metals, plastics, composites, etc. to lighten the weight of the irrigation apparatus.

[0123] It will be appreciated that the wheeled chassis 60 may be equipped with a suitable type of previously patented and conventional guidance and control system for controlling the speed of movement and direction of the wheeled chassis 60.

[0124] FIGS. 7A to 7C illustrate the irrigating position of the irrigation apparatus 10 in accordance with the first exemplary embodiment of the invention, which is operating as a mobile sprinkler irrigation system. As best shown in FIGS 7H and 7G, a plurality of ports 403, which may be equipped with spray nozzles 404, are placed at selected positions along the length of the water distribution conduit 40. In addition, an end sprinkler 406 may be mounted at the outer end 402 of the water distribution conduit 40 to increase the coverage of the circular or sector-shaped areas 1003, 1004 to be irrigated, or to irrigate non-circular portions 1005 of the agricultural field 1000 of FIG. 1A. Furthermore, as best shown in FIGS. 6C and 7J, a rear sprinkler 407 may be mounted on a foldable backwardly extending arm 408 and supplied with water from the water distribution conduit 40 for splashing water backwardly, away from the wheels to prevent the wheels 610a, 610b and 610c from being dug into the wet soil, thus enabling forward move on dry soil.

[0125] As shown generally in FIGS. 2B, 3C and FIGS. 7A to 7D, in the irrigating position of irrigation apparatus 10, the centre pivot support structure 50 is located at the pivot point 1006 of the circular area 1003, the elongated water distribution conduit 40 pivoted at its inner end 401 to the centre pivot support structure 50, and extending radially outwardly therefrom. The wheeled chassis 60 and the centre pivot support structure 50 support the boom 30 thereon. As best shown in FIGS. 3C and 7D, the connection tube 20 connects the irrigation hydrant 1007 to the water inlet 381 of the elongated inner sub-boom 31 for supplying the water distribution conduit 40. Water flows through the irrigation hydrant 1007, the connection tube 20, the tubular body of the central mast 314, the swivel joint 383 and the flexible pipe 384 and finally enters the water distribution conduit 40 from its inner end 401. As best shown in FIGS. 7G and 7J, the plurality of spray nozzles 404, the end sprinkler 406 and the rear sprinkler 407 spray water onto the surface of the agricultural field 1000 while the wheeled chassis 60 moves in a self-propelled manner along a circular path around the pivot point 1006 to propel the elongated water distribution conduit 40 around the centre pivot support structure 50.

[0126] FIGS. 8A, 8B and enlarged details A and B schematically illustrate the irrigating position of the irrigation apparatus, in accordance with the first exemplary embodiment of the invention, which is operating as a mobile drip irrigation system, wherein a plurality of drip tubs 405 mounted on the ports 403 and suspended from the water distribution conduit 40. The plurality of drip tubes 405 is pulled along the soil from the moving water distribution conduit 40. Water is supplied from the water distribution conduit 40 and emitted directly from the drip tubes 405 onto the soil.

[0127] Water flow may be controlled by means of suitable valves, which may be set and operated using a conventional control panel (not shown). The amount of water discharged from each spray nozzle 404 or drip tube 405 along the water distribution conduit 40 can be progressively varied by a suitable conventional mechanism because of the larger areas that the outer spray nozzles 404 or drip tubes 405 irrigate.

[0128] By increasing the speed of revolving wheeled chassis 60 in irrigating position 10, the rotation of the water distribution conduit 40 may be repeated more than time round around the pivot point 50 so that a determined amount of water can be delivered in lower amounts but more than one time to prevent water runoff, if the runoff is a problem.

[0129] The numeral 10b of FIG. 2C and FIGS. 9A to 9E indicates one possible configuration of the transport position of the irrigation apparatus, in accordance with the first exemplary embodiment of the invention, in which the collapsed configuration of the inner sub-boom 31 b and the outer sub-boom 32b, the collapsed configuration of the centre pivot support structure 50b and the connection tube 20 are loaded on the wheeled chassis 60. The mast 324 of the outer sub-boom 32b is supported upon the support stand 628, and the boom sections 323 of the outer sub-boom 32b are loaded on the side support arms 629. In addition, the middle frame 310 of the inner subboom 31 b is supported upon the front support arms 630 and the boom sections 313 of the inner sub-boom 31 b are loaded on the side support arms 629. Also, the collapsed configuration of the centre pivot support structure 50b is attached to the central mast 314. The configuration of the transport position of the irrigation apparatus 10b, in which the inner and the outer sub-booms 31 b and 32b are in the collapsed configuration, simplifies transporting the irrigation apparatus, especially on paths with obstacles and far distances.

[0130] The numeral 10c of FIG. 2D indicates another possible configuration of the transport position of the irrigation apparatus, in accordance with the first exemplary embodiment of the invention, in which the extended configuration of the elongated inner sub-boom 31 and the elongated outer sub-boom 32, the collapsed configuration of the centre pivot support structure 50b and the connection tube 20 are loaded on the wheeled chassis 60. The mast 324 of the elongated outer sub-boom 32 is supported upon the support stand 628, and the middle frame 310 of the elongated inner sub-boom 31 is supported upon the front support arms 630. The configuration of the transport position of the irrigation apparatus 10c in which the inner and the outer sub-booms 31 and 32 are in extended configuration may facilitate the assembling and collapsing process of the irrigation apparatus.

[0131] As previously mentioned, the inner and outer sub-booms may be of collapsible or non- collapsible types. Utilizing the collapsible types of inner and outer sub-booms enables the irrigation apparatus to be transported while the inner and outer sub-booms are selectively in collapsed configuration or extended configuration, as illustrated by the numerals 10b in FIG. 2C or in extended, as indicated by numeral 10c in FIGS. 2C and 2D. However, utilizing the non- collapsible types of the inner and outer sub-booms only allows the irrigation apparatus to be transported while the inner and outer sub-booms are in the extended configuration, as illustrated by the numeral 10c.

[0132] As shown in FIG. 2C, in the transport position, the irrigation apparatus may be towed by a suitable towing vehicle 80. Also, as previously mentioned, the powertrain system 650 may be arranged to propel the wheeled chassis 60 in a self-propelled manner while the irrigation apparatus is in the transport position 10b or 10c without needing any towing vehicle.

[0133] Referring generally to FIGS. 1A to 9E the method of assembling and operating the irrigation apparatus of the first embodiment of this invention by an operator may comprise the following steps: transporting the irrigation apparatus next to the pivot point 1006 of a circular area 1003 or a sector-shaped area 1004 of the agricultural field 1000 of FIG. 1A while the irrigation apparatus is in the transportation position 10b or 10c; raising the lifting column 501 placing the centre pivot support structure 50 at the pivot point and securing the stabilizer legs 502 on the slab 1009; unfolding the inner sub-boom 31 b (if the inner sub-boom 31 is in the extended configuration there is no need to unfolding step); moving the wheeled chassis 60 away from the centre pivot support structure 50 up to a determined distance from the pivot point 1006; unfolding the outer sub-boom 32b (if the outer sub-boom 32 is in the extended configuration, there is no need for unfolding step); connecting the outer sub-boom 32 to the inner sub-boom 31 ; raising the boom 30 up to a determined height; connecting the water inlet 381of the central mast 314 to the irrigation hydrant 1007 by means of the connection tube 20; opening the valves, setting the control system and operating the irrigation apparatus 10 to irrigate the field.

[0134] The method of collapsing the irrigation apparatus 10 of the first embodiment of this invention by an operator may comprise the following steps: closing the valves after completing the irrigation; disconnecting the connection tube 20; disconnecting the outer sub-boom 32 from the inner sub-boom 31 ; moving the wheeled chassis 60 next to the centre pivot support structure 50; adjusting the front support arms 630 of the wheeled chassis 60 with the middle frame 310 of the inner sub-boom 31 ; lowering the lifting column 501 of the central mast 50 so that the middle frame 310 of the inner sub-boom 31 can be loaded on the front support arms 630; collapsing the centre pivot support structure 50, folding the outer and the inner sub-booms 32, 31 (if the inner and outer sub-booms 31 and 32 are supposed to be extended in the transport position 10b, there is no need for folding steps).

[0135] The processes of transporting, assembling, operating and collapsing the irrigation apparatus 10 may, repeatedly, be done for all circular and sector-shaped areas 1003, 1004 so that the entire surface of the agricultural field 1000 is irrigated. As previously mentioned, the non-circular areas 1005 of the field 1000 can be irrigated by means of the end sprinkler 406 or other suitable ways.

[0136] With reference to exemplary FIGS. 1A to 1 D and FIGS. 10A to 14F, the second exemplary embodiment of this invention, will be described.

[0137] The numeral 10' in FIGS. 10A to 10C indicates the irrigating position of the irrigation apparatus in accordance with the second exemplary embodiment of the present invention. In addition, the numeral 10'b in FIGS. 13C and 13D indicates the transport position of the irrigation apparatus in accordance with the second exemplary embodiment of the present invention. In the second exemplary embodiment of the invention, the irrigation apparatus 10' comprises a collapsible centre pivot support structure 50', a first wheeled chassis 60' and a second wheeled chassis 60's, a connection tube 20' and a collapsible elongated boom 30' which includes a collapsible elongated water distribution conduit 40'. The collapsible elongated boom 30' consists of an elongated horizontally folding inner sub-boom 3T, an elongated horizontally folding first outer sub-boom 32' and an elongated horizontally folding second outer sub-boom 33'. The water distribution conduit 40' has an inner end 401' and an outer end 402'. Also, the collapsible elongated water distribution conduit 40' includes an elongated inner part, an elongated first outer part and an elongated first outer part. Each of the inner and the outer parts of the collapsible elongated water distribution conduit 40' maintained by its associated inner and outer sub-booms 3T, 32' and 33', as best shown in FIG. 10B. [0138] The configuration of the centre pivot support structure, the inner and the outer sub-booms and the connection tube of the irrigation apparatus of the first embodiment and the second embodiment of the invention are generally similar and will not be described again in detail.

[0139] With reference to FIGS. 10B and 10C in the irrigating position of the irrigation apparatus 10', the elongated inner sub-boom 3T, the elongated first outer sub-boom 32' and the elongated second outer sub-boom 33' may be connected at their adjacent ends by means of suitable connection means (not shown) and positioned in a straight line to form an extended configuration of the elongated boom 30'. The connection between the elongated inner sub-boom 3T and the elongated first outer sub-boom 32' may, horizontally, be rigid. Horizontal rigidity of the connection between the elongated inner sub-boom 31' and the elongated first outer sub-boom 32' makes the elongated inner sub-boom 3T to be revolved along with the elongated outer sub-boom 32' around the centre pivot support structure 50' while the first wheeled chassis 60' propelling the elongated first outer sub-boom 32' in the irrigating position 10'. The first outer sub-boom 32' and the second outer sub-boom 33' may be connected by means of any suitable flexible joint, such as a flexible tube 409', as best shown in FIGS. 10G and 10H, so that the second outer sub-boom can be moved freely without posing excessive tensions to the members of the boom 30', and hence keeps the boom 30' from being damaged. In the collapsed configuration of the elongated boom 30', the inner sub-boom 31' and the outer sub-booms 32', 33' may be disconnected.

[0140] The first wheeled chassis may be configured in any suitable construction. For example, FIGS. 11 A to 11 D show the first wheeled chassis 60' of the second embodiment of the invention, having a tricycle-like construction and comprising a chassis 620', three wheels 610'a, 610'b and 610'c which engage the soil, and a powertrain system 650' which mounted on the chassis 620' for driving the front wheels 610'a, 610'b. The wheels and the powertrain system of the first wheeled chassis of the first and second embodiment of the invention are similar and will not be described in detail again. The chassis 620' of the first wheeled chassis 60' is equipped with a telescopically extendable and retractable arm 633' for supporting the rear wheel 610 'C. As best shown in FIGS. 11 A, 11 B, 11 E and 11 F in the irrigating position of the irrigation apparatus 10', the rear arm 633' may be extended. Also, as best shown in FIGS. 11C, 11 D, 11G, 11 H and 11 J in the transport position of the irrigation apparatus 10'b, the rear arm 633' may be retracted. In addition, the chassis 620' of the first wheeled chassis 60' provided with a pair of front support arm 630' for supporting the middle frame 310' of the inner sub-boom 31 'b in the transport position 10'b as best shown in FIGS. 13A, 13B and 13D. The first wheeled chassis 60' also provided with a support stand 328' for supporting the mast 324' of the first outer sub-boom 32'b, as best shown in FIGS. 11F to 11 J and FIGS. 13A to 13D.

[0141] As shown in FIG. 12A the configuration of the second wheeled chassis 60's of the irrigation apparatus 10' in accordance with the second embodiment of this invention is, generally, similar to the configuration of the wheeled chassis 60 of the first embodiment of the irrigation apparatus. However, the second wheeled chassis 60's of the second embodiment is not provided with the pair of front support arms 630. As shown in FIGS. 12A and 12B, the second wheeled chassis 60's equipped with a pair of front support frame 634's for supporting the first wheeled chassis 60' in the transport position 10b. As best shown in FIG. 12B, each support frame 634's connected to the chassis 620's by means of a pair of hinged arms 635's, and may be raised and lowered by means of a hydraulic cylinder 636's for raising and lowering the support frames 634's.

[0142] As previously mentioned, the wheeled chassis 60' and 60's may be equipped with a guidance and control system for controlling the speed and direction of the wheeled chassis 60' and 60's.

[0143] As illustrated in FIGS. 10A to 10F, in the irrigating position of irrigation apparatus 10' of the second embodiment of the invention, the centre pivot support structure 50' located at the pivot point 1006 of the circular area 1003, the elongated water distribution conduit 40' pivoted at its inner end 401' to the centre pivot support structure 50' and extending outwardly therefrom. The first wheeled chassis 60', the second wheeled chassis 60's and the centre pivot support structure 50' support the boom 30' thereon. As best shown in FIG. 10D, the connection tube 20' connects the irrigation hydrant 1007 to the water inlet of the elongated inner sub-boom 31', for supplying the water distribution conduit 40' with water through its inner end 401'. The water distribution conduit 40' distributes water onto the field via a plurality of ports along the length of the water distribution conduit 40' while the first wheeled chassis 60' and the second wheeled chassis 60's moving in a self-propelled manner along circular paths around the pivot point 1006 so as to propel the water distribution conduit 40' around the centre pivot support structure 50'. As previously described for the first embodiment of the invention, a plurality of spray nozzles may be mounted on the plurality of ports along the length of the water distribution conduit 40' so that the irrigation apparatus 10' operates as a mobile sprinkler irrigation system. In addition, a plurality of drip tubes may be mounted on the plurality of ports along the length of the water distribution conduit 40' so that the irrigation apparatus 10' operates as a mobile drip irrigation system.

[0144] With reference to FIGS. 13A to 13E, the transport position of the irrigation apparatus of the second embodiment of the invention, which referred by the numeral 10'b, will be described. In the transport position 10'b, the first wheeled chassis 60', the collapsed configuration of the inner subboom 32'b, the collapsed configuration of the first outer sub-boom and the second outer subboom 32'b, 33'b, the collapsed configuration of the centre pivot support structure 50'b and the connection tube 20' are loaded on the second wheeled chassis 60's. The first wheeled chassis 60' is supported by the support frames 634's. The mast 334' of the second outer sub-boom 33'b supported upon the support stand 628's of the second wheeled chassis 60's and the boom sections 333's of the second outer sub-boom 33'b are loaded on the side support arms 629's of the second wheeled chassis 60's. The mast 324' of the first outer sub-boom 32'b is supported upon the support stand 628' of the first wheeled chassis 60', and the boom sections 323' of the first outer sub-boom 32'b are loaded on the side support arms 629's of the second wheeled chassis60's. The middle frame 310' of the inner sub-boom 31'b supported upon the front support arms 630' of the first wheeled chassis 60', and the boom sections 313' of the inner sub-boom 31'b loaded on the side support arms 629's of the second wheeled chassis 60's. Furthermore, the collapsed configuration of the centre pivot support structure 50'b is attached to the central mast 314' of the inner sub-boom 31'b.

[0145] With reference to FIGS. 14A to 14F, as indicated by the numeral 11', another configuration of irrigating position of irrigation apparatus, in accordance with the second embodiment of the invention, will be described, wherein the centre pivot support structure 50' separated from the central mast 314' and located at the pivot point 1006 of the circular area 1003, a swivel elbow 383'b which provided with a water inlet 381 'b mounted upon the centre pivot support structure 50', the second outer part of the water distribution conduit 40' pivoted at its inner end 401 'b to the centre pivot support structure 50' and extending outwardly therefrom, the second wheeled chassis 60's support the second outer sub-boom 33' thereon, the connection tube 20' connects the irrigation hydrant 1007 to the water inlet 381 'b of swivel elbow 384'b for supplying the outer part of the water distribution conduit 40' with water through its inner end 401 'b. The second outer part of the water distribution conduit 40' distributes water onto the field via the ports along the length of the water distribution conduit 40' while the second wheeled chassis 60's moves in a self-propelled manner along a circular path around the pivot point 1006 to propel the second outer part of the water distribution conduit 40' around the centre pivot support structure 50'.

[0146] It will be appreciated that the first wheeled chassis and the second wheeled chassis of the irrigation apparatus may be configured in another suitable configuration, for example, the configuration 60i and 60j schematically illustrated in exemplary FIG.14G, to be connected in the transport position of the irrigation apparatus.

[0147] Though in the second exemplary embodiment of the invention, the irrigation apparatus 10' adapted to comprise two numbers of elongated outer sub-booms 32' and 33' and two numbers of wheeled chassis 60' and 60's, it will be appreciated that the irrigation apparatus of this invention may be arranged to comprise more the two numbers of outer sub-booms and more than two numbers of wheeled chassis.

[0148] With reference to exemplary FIGS. 1A to 1 D and FIGS. 15A to 21J, the third exemplary embodiment of this invention, will be described.

[0149] The numeral 10" in FIGS. 15A, 15B and 18A indicate an irrigating position of the irrigation apparatus in accordance with the third exemplary embodiment of the present invention. In addition, the numeral 10"b in FIGS. 15C, 15D, 20A and 20B indicate a transport position of the irrigation apparatus in accordance with the third exemplary embodiment of the invention. In the third exemplary embodiment of the invention, the irrigation apparatus 10" comprises a collapsible centre pivot support structure 50", a wheeled chassis 60", a connection tube 20" and a collapsible elongated boom 30" which includes a collapsible elongated water distribution conduit 40". The collapsible elongated boom 30" consists of an elongated vertically folding inner sub-boom 31 "and an elongated vertically folding outer sub-boom 32". The water distribution conduit 40" has an inner end 401" and an outer end 402". Also, the elongated collapsible water distribution conduit 40" includes an elongated inner part and an elongated outer part. Each of the inner and the outer parts of the elongated collapsible water distribution conduit 40" is maintained by its associated inner and outer sub-booms 31" and 32" of the boom 30".

[0150] The configuration of the centre pivot support structure and the connection tube of the irrigation apparatus of the first and third embodiment of the invention are generally similar; hence, it will not be described in detail.

[0151] In the third exemplary embodiment of the invention, the elongated inner sub-boom and outer sub-boom 31" and 32" may be configured as the configuration of conventional vertically folding irrigation booms. Hence, the configuration of the conventional vertically folding irrigation booms may be relied upon to complete the details of the elongated inner and outer sub-booms 31" and 32".

[0152] The numeral 31" of FIGS. 15B, 16A, 18A and 18B indicates an extended configuration of the elongated vertically folding inner sub-boom. The numeral 32" of FIGS. 15B, 17A, 18A and 18D indicates an extended configuration of the elongated vertically folding outer sub-boom. Additionally, the numeral 31"b of FIGS. 16C to 16E and the numeral 32"b of FIGS. 17C to 17F indicate a collapsed configuration of the vertically folding inner sub-boom and the vertically folding outer sub-boom.

[0153] Like the horizontally folding outer sub-boom 32, the vertically folding outer sub-boom 32" includes a left-wing 321", a right-wing 322" and a middle frame 320". The key components of the vertically folding outer sub-boom 32", including boom sections 323", the outer section of the water distribution conduit 40", supporting cables 325", supporting bars 326" and vertical mast 324" are illustrated in FIGS. 17A, 17B, 18D, 19G and 19H. As shown in exemplary drawings of FIGS. 19A to 19E, the left-wing 321" and the right-wing 322" may, vertically, be folded and unfolded by an operator in a conventional method to transfer the conventional vertically folding irrigation boom between the collapsed configuration 32"b and the extended configuration 32".

[0154] While the configuration of the elongated inner and outer sub-booms of the irrigation apparatus in the exemplary embodiments of the present invention are generally similar to the configuration of the conventional horizontally folding and vertically folding irrigation booms, it will be appreciated that the elongated inner and the sub-booms might be configured similarly to the configuration of other suitable collapsible or non-collapsible types of irrigation booms for supporting the water distribution conduit.

[0155] Like the elongated horizontally folding inner sub-boom 31 of the first exemplary embodiment of the invention, the elongated vertically folding inner sub-boom 31" may be provided with a water inlet 381" on its central mast 314", a water-sealed swivel joint 383" and a flexible pipe 384" as best shown in FIGS. 16B and 18C. In addition, the elongated vertically folding inner sub-boom 31" may be provided with a counter weight 386" as best shown in FIG. 18F and detail A of FIG. 16A. As shown in FIG. 17F the lower part of the mast 324 " of the second sub-boom 32" provided with a foldable section which enables the outer sub-boom 32 " to be lowered to a horizontal position, as shown in FIG. 17F, and raised to a vertical position, as shown in FIG. 17D.

[0156] Referring to FIG. 15B, in the irrigating position of the irrigation apparatus 10", the elongated inner sub-boom 31" and the elongated outer sub-boom 32" may be connected at their adjacent ends by means of suitable connection means (not shown) and positioned in a straight line so as to form an extended configuration of the elongated boom 30". The connection between the elongated inner sub-boom 31" and the elongated outer sub-boom 32" may, horizontally, be rigid. In the collapsed configuration of the elongated boom 30", the inner sub-boom 31" and the outer sub-boom 32" may be disconnected from each other to form the collapsed configuration of the boom 30".

[0157] As shown in FIG. 21 A, the configuration of the wheeled chassis 60" of the irrigation apparatus 10" in accordance with the third exemplary embodiment of the invention is, generally, similar to the configuration of the wheeled chassis 60 of the first embodiment of the irrigation apparatus. However, the second wheeled chassis 60" of the third embodiment is not provided with the pair of front support arms 630. The wheeled chassis 60" is equipped with a raising frame 637" which may be lowered to a horizontal position or raised to a vertical position by means of a hydraulic cylinder 638", as shown in FIGS. 21 A to 21 C. The raising frame 637" can be applied for raising the inner and outer sub-booms 31"b, 32"b to a vertical position and lowering these sub-booms 31"b, 32"b to a horizontal position on the wheeled chassis 60", as shown in FIGS. 21F to 21J. Referring to FIGS. 21 F and 21 J, raising the inner and outer sub-booms 31"b and 32"b to a vertical position enables an operator to unfold the sub-booms 31"b and 32"b, as illustrated in FIGS. 19A to 19G.

[0158] As indicated by the numeral 10" of FIGS. 15A, 15B and 18A, in the irrigating position of irrigation apparatus, in accordance with the third exemplary embodiment of the invention, the centre pivot support structure 50" located at the pivot point 1006 of the circular area 1003, the elongated water distribution conduit 40" pivoted at its inner end 401" to the centre pivot support structure 50" and extending outwardly therefrom. The wheeled chassis 60" and the centre pivot support structure 50" support the boom 30" thereon. As best shown in FIGS. 16B and 18C, the connection tube 20" connects the irrigation hydrant 1007 to the water inlet 381"of the elongated inner sub-boom 31" for supplying the water distribution conduit 40" with water. Water flows through the irrigation hydrant 1007, the connection tube 20", the tubular body of the central mast 314", the swivel joint 383", the flexible pipe 384" and, finally, enters the water distribution conduit 40" from its inner end 401 ". The water distribution conduit 40" distributes water onto the field via a plurality of ports along the length of the water distribution conduit 40" while the wheeled chassis 60" moves in a self-propelled manner along a circular path around the pivot point 1006 to propel the water distribution conduit 40" around the centre pivot support structure 50". As previously described for the first embodiment of the invention, a plurality of spray nozzles may be mounted on the plurality of ports along the water distribution conduit 40" so that the irrigation apparatus 10" operates as a mobile sprinkler irrigation system. In addition, a plurality of drip tubes may be mounted on the plurality of ports along the water distribution conduit 40" so that the irrigation apparatus 10" operates as a mobile drip irrigation system.

[0159] As indicated by the numeral 10"b of FIG. 15C and FIGS. 20A to 20D, in the transport position of the irrigation apparatus, in accordance with the third exemplary embodiment of the invention, the collapsed configuration of the inner sub-boom 31 "b and the outer sub-boom 32b", the collapsed configuration of the centre pivot support structure 50"b and the connection tube 20" are loaded on the wheeled chassis 60".

[0160] The processes of transporting, assembling, operating and collapsing the irrigation apparatus in accordance with the first and third exemplary embodiment are generally similar.

[0161] The previous description and accompanying drawings illustrate the principles, exemplary embodiments and modes of operation of the invention. Nevertheless, the invention should not be construed as being limited to the particular embodiments discussed above. Additional variations of the embodiments discussed above will be appreciated by those skilled in the art.

[0162] Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive. Accordingly, it should be appreciated that variations to those embodiments can be made by those skilled in the art without departing from the scope of the invention as defined by the following claims.

Industrial Applicability

[0163] The collapsible and portable centre pivot irrigation apparatus of this invention may be applied for irrigating agricultural fields. I

Claims

[Claim 1] A collapsible and portable centre pivot irrigation apparatus which is transformable between an irrigating position for irrigating an agricultural field in a revolving pattern and a transport position, in which said irrigation apparatus is collapsed, for being transported; said collapsible and portable centre pivot irrigation apparatus comprising: a centre pivot support structure; a collapsible elongated boom being transformable between a collapsed configuration and an extended configuration, including an elongated inner sub-boom and at least one elongated outer sub-boom, in said extended configuration of said elongated boom, said elongated inner and outer sub-booms may be connected in an end to end manner and positioned in a straight line, while in said collapsed configuration of said elongated boom said inner and outer sub-booms may be collapsed and disconnected; said collapsible elongated boom comprising a collapsible elongated water distribution conduit, having an inner end and an outer end; said collapsible elongated water distribution conduit includes an inner part and at least one outer part, each of said inner and outer parts of said water distribution conduit may be maintained by its associated said inner and outer sub-booms; a connection tube for connecting said irrigation apparatus to an irrigation hydrant which is located proximate to a pivot point of a circular or sector-shaped area of said agricultural field; a plurality of ports located along the length of said water distribution conduit for distributing water onto the surface of said field; and at least one wheeled chassis.

[Claim 2] An irrigation apparatus of claim 1 , wherein said wheeled chassis comprises: a chassis; at least three wheels mounted on said chassis and engage the soil of the ground surface; a powertrain system mounted on said chassis for driving at least one of said wheels, said powertrain system comprising a prime mover for

25 generating mechanical energy, and a transmission system for adjusting the mechanical energy of the prime mover according to driving conditions of said wheeled chassis and ultimately for transmitting the adjusted mechanical energy to at least one of said wheels; and a control system for controlling the direction and speed of said wheeled chassis.

[Claim 3] An irrigation apparatus of claim 1 , wherein in one possible configuration of said irrigating position of said irrigation apparatus, said centre pivot support structure located at said pivot point of said circular or sectorshaped area; said elongated water distribution conduit , rotationally, connected at its inner end to said centre pivot support structure and extending radially outwardly therefrom, said wheeled chassis and said centre pivot support structure support said extended configuration of said elongated boom thereon; said connection tube connects said irrigation hydrant to said irrigation apparatus for supplying said water distribution conduit with water through its inner end; said elongated water distribution conduit distributes water onto said field via said ports along the length of said water distribution conduit while said wheeled chassis move(s) in a self-propelled manner along (a) circular or arc-like path(s) around said pivot point so as to propel said elongated water distribution conduit around said centre pivot support structure.

[Claim 4] An irrigation apparatus of claim 1 , wherein in said transport position of said irrigation apparatus, said elongated boom, said centre pivot support structure and said connection tube loaded on said wheeled chassis to be transported.

[Claim 5] An irrigation apparatus of claims 1 and 3, wherein each of said inner and outer sub-booms may be lowered and raised using at least one suitable lifting device for adjusting the height of said elongated boom at the desired level.

[Claim 6] An irrigation apparatus of claims 1 and 3, wherein a plurality of spray nozzles mounted on said ports for spraying water along the length of said water distribution conduit onto the surface of said field.

[Claim 7] An irrigation apparatus of claims 1 and 3, wherein an end sprinkler may be mounted at said outer end of said elongated water distribution conduit to increase the coverage of said circular or sector-shaped area to be irrigated or to irrigate non-circular portions of said field.

[Claim 8] An irrigation apparatus of claims 1 and 3, wherein a plurality of drip tubes mounted on said ports, so that said drip tubes emit the water from said ports directly onto the soil of said field.

[Claim 9] An irrigation apparatus of claims 1 and 2, wherein said collapsible elongated boom, said water distribution conduit, said wheeled chassis and said connection tube may be made of any suitable lightweight material, including lightweight metals, plastics, composites, etc.

[Claim 10] An irrigation apparatus of claim 2, wherein said prime mover comprises an electric motor.

[Claim 11] An irrigation apparatus of claim 2, wherein said prime mover comprises an internal combustion engine.

[Claim 12] An irrigation apparatus of claim 2, wherein said prime mover comprises a hydraulic turbine.

[Claim 13] An irrigation apparatus of claim 2, wherein said prime mover comprises a compressed air engine.

[Claim 14] An irrigation apparatus of claim 1, wherein said inner and outer subbooms may be of extended non-collapsible types.

[Claim 15] An irrigation apparatus of claim 1, wherein said inner and outer subbooms may be of collapsible types, being transformable between a collapsed and an extended configuration.

[Claim 16] An irrigation apparatus of claims 1, 4 and 15, wherein in said transport position of said irrigation apparatus, said collapsed configuration of said inner and outer sub-booms may be loaded on said wheeled chassis.

[Claim 17] An irrigation apparatus of claims 1, 4, 14 and 15, wherein in said transport position of said irrigation apparatus, said extended configuration of said inner and outer sub-booms may be loaded on said wheeled chassis.

[Claim 18] An irrigation apparatus of claims 1 , 4, 10, 11 , 12 and 13, wherein in said transport position of said irrigation apparatus, said wheeled chassis may be transported in a towing position by another vehicle.

[Claim 19] An irrigation apparatus of claims 1 , 4, 10, 11 and 13, wherein in said transport position of said irrigation apparatus, said wheeled chassis may be transported in a self-propelled manner.

[Claim 20] An irrigation apparatus of claim 1, wherein said outer part of said elongated water distribution has an inner end.

[Claim 21] An irrigation apparatus of claims 1 and 20, wherein in another possible configuration of said irrigating position of said irrigation apparatus, said centre pivot support structure located at said pivot point of said circular or sector-shaped area; said outer part of said elongated water distribution conduit, rotationally, connected at its inner end to said centre pivot support structure and extending radially outwardly therefrom, said wheeled chassis and said supports said extended configuration of said outer sub-boom thereon; said connection tube connects said irrigation hydrant to said irrigation apparatus for supplying said outer part of said water distribution conduit with water through its inner end; said outer part of elongated water distribution conduit distributes water onto said field via said ports along the length of said outer part of said water distribution conduit while said wheeled chassis movies in a self-propelled manner along a circular or arc-like paths around said pivot point so as to propel said outer part of said elongated water distribution conduit around said centre pivot support structure.

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