Abstract: A method and means for converting a water drive center pivot irrigation system to air drive is described whereby the more economical air drive is substituted for the water drive on each of the drive towers. The water drive cylinder on each of the drive towers of the system is modified to function as an air cylinder which is operatively connected to the trojan bar on the drive tower whereby actuation of the air cylinder will cause the trojan bar to be reciprocally moved to drive at least one of the drive wheels on the tower. An alignment panel is mounted on the drive tower and is connected to the air cylinder for controlling the operation of the same. The alignment panel is operatively secured to the existing alignment control apparatus on the drive tower so that the alignment panel will function in response to the alignment control apparatus.

Abstract: A pneumatic side roll wheel line irrigation system comprising an elongated irrigation pipe supported along the length by a plurality of spaced apart wheels mounted thereon with the pipe serving as an axle for the wheels. A pneumatic side roll mover apparatus is associated with the pipe intermediate the ends thereof for moving the pipe in a sideways direction over the area to be irrigated. The side roll mover apparatus comprises a wheeled frame means which is operatively secured to the pipe for causing the rotation of the pipe whereby the entire length of pipe will be rotated and moved. An air operated hydraulic pump is provided on the wheeled frame and is connected to a hydraulic motor. The drive assembly operatively connects the hydraulic motor to the pipe whereby actuation of the hydraulic motor will cause the rotation of the pipe and will cause the wheeled frame and pipe to be propelled in the sideways direction.

Abstract: A reversible self-propelled center pivot sprinkler system comprising a central pivot having an overhead water supply pipe extending outwardly therefrom supported by a plurality of drive towers. A drive and control apparatus is provided on each of the towers to propel the towers and water supply pipe around the central pivot point in an aligned condition. The drive apparatus is connected to a trojan bar which is reciprocatably mounted on the tower and which is provided with an automatically controlled movable double dog on at least one end thereof for engagement with drive lugs on at least one of the drive wheels of the tower. The double dog is normally in position so that movement of the trojan bar in one direction will cause the dog to engage the wheel drive lugs so that the tower will be moved in a forwardly direction.

Abstract: A brake for a fluid-powered sprinkler system is provided for preventing the drive towers from rolling down inclines and for preventing the wind from rolling the drive towers. The fluid power may either be compressed air or water under pressure. An overhead water supply pipe extends outwardly from the center pivot point and is supported by a plurality of spaced-apart wheeled drive towers. In the preferred embodiment, an air-powered drive is provided on each of the towers to propel the towers and water supply pipe around the center pivot point. A control is provided on each of the towers for selectively operating the drive associated therewith to maintain the pipe and towers in an aligned condition as the water supply pipe is pivoted around the central pivot point. The control comprises a rotary cam plate having an alignment rod secured thereto which extends to the gimbal ring on a flexible joint positioned on the water supply pipe adjacent the tower.

Abstract: A brake for a fluid-powered sprinkler system is provided for preventing the drive towers from rolling down inclines and for preventing the wind from rolling the drive towers. The fluid power may either be compressed air or water under pressure. An overhead water supply pipe extends outwardly from the center pivot point and is supported by a plurality of spaced-apart wheeled drive towers. In the preferred embodiment, an air-powered drive is provided on each of the towers to propel the towers and water supply pipe around the center pivot point. A control is provided on each of the towers for selectively operating the drive associated therewith to maintain the pipe and towers in an aligned condition as the water supply pipe is pivoted around the central pivot point. The control comprises a rotary cam plate having an alignment rod secured thereto which extends to the gimbal ring on a flexible joint positioned on the water supply pipe adjacent the tower.

Abstract: A reversible self-propelled center pivot sprinkler system for sprinkling or irrigating a relatively large area surrounding a central pivot comprising an overhead water supply pipe extending outwardly from the center pivot point and supported by a plurality of spaced-apart, wheeled towers. A drive apparatus is provided on each of the towers to propel the towers and water supply pipe around the central pivot point. A control apparatus is provided on each of the towers for selectively operating the drive apparatus associated therewith to maintain the pipe and towers in an aligned condition as the water supply pipe is pivoted around the center pivot point. The drive apparatus is connected to a trojan bar which is reciprocatably mounted on the tower and which is provided with a selectively movable double dog on at least one end thereof for engagement with drive lugs on at least one of the drive wheels of the tower.

Abstract: A brake for an air-powered sprinkler system is provided for preventing the drive towers from rolling down inclines and for preventing the wind from rolling the drive towers. An overhead water supply pipe extends outwardly from the center pivot point and is supported by a plurality of spaced apart wheeled drive towers. An air-powered drive is provided on each of the towers to propel the towers and water supply pipe around the center pivot point. A control is provided on each of the towers for selectively operating the drive associated therewith to maintain the pipe and towers in an aligned condition as the water supply pipe is pivoted around the central pivot point. The control comprises a rotary cam plate having an alignment rod secured thereto which extends to the gimbal ring on a flexible joint positioned on the water supply pipe adjacent the tower.

Abstract: A brake for an air-powered sprinkler system for preventing the drive towers from rolling down inclines and for preventing the wind from rolling the drive towers. An overhead water supply pipe extends outwardly from the center pivot point and is supported by a plurality of spaced apart wheeled drive towers. An air-powered drive mechanism is provided on each of the towers to propel the towers and water supply pipe around the center pivot point. A control mechanism is provided on each of the towers for selectively operating the drive mechanism associated therewith to maintain the pipe and towers in an aligned condition as the water supply pipe is pivoted around the central pivot point. The control mechanism comprises a rotary cam plate having an alignment rod secured thereto which extends to the gimbal ring on a flexible joint positioned on the water supply pipe adjacent the tower.