Fluid handling – With casing – support – protector or static constructional... – Vehicle
Patent
1976-04-28
1977-07-12
Cohan, Alan
Fluid handling
With casing, support, protector or static constructional...
Vehicle
239177, B05B 312
Patent
active
040347796
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. The double dog is automatically moved to a second position so that the dog will engage the wheel drive lugs as the trojan bar is moving in a second direction to cause the tower to be moved rearwardly. The double dog comprises a hydraulic cylinder operatively connected to a reversible trojan bar dog having opposing dog surfaces. A double ratchet-type brake is provided on the tower to prevent the tower from undesirable rolling in a direction opposite to the direction of driving travel. The double ratchet-type brake may be operatively interconnected to the double dog whereby remote control or operation of the double dog also causes the double ratchet-type brake to be moved to permit the tower to roll in the desired direction while preventing undesirable rolling in the opposite direction.
REFERENCES:
patent: 3606161 (1971-09-01), Paul
patent: 3766937 (1973-10-01), Lundvall et al.
patent: 3866836 (1975-02-01), Dowd
Cohan Alan
Michalsky Gerald A.
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