초록 ▼

A direction of movement sensing apparatus is shiftably supported from the wheel track filling structure of a wheeled support tower for an irrigation pipe and is operative to shift between a first inoperative position assumed thereby when the tower is moving in a forward direction toward a second ope

A direction of movement sensing apparatus is shiftably supported from the wheel track filling structure of a wheeled support tower for an irrigation pipe and is operative to shift between a first inoperative position assumed thereby when the tower is moving in a forward direction toward a second operative position relative to the wheel track filling structure when the tower is moved rearwardly over the ground. Connecting structure is provided and operatively connected between the direction sensing apparatus, the wheel track filling structure and the tower for raising the wheel track filling structure responsive to movement of the sensing apparatus to the second operative position thereof and thus enabling the tower to move rearwardly without damage to the wheel track filling structure.

대표청구항 ▼

A wheeled structure adapted to move over the ground in forward and reverse directions, a wheel track filler including an elongated arm having front and rear end portions, attaching means pivotally attaching said front end portion to said wheeled structure for vertical swinging of said arm about a fi

A wheeled structure adapted to move over the ground in forward and reverse directions, a wheel track filler including an elongated arm having front and rear end portions, attaching means pivotally attaching said front end portion to said wheeled structure for vertical swinging of said arm about a first horizontal axis transverse to said arm and said directions between a lowered rearwardly projecting position and a raised rearwardly and upwardly inclined position, said rear end portion of said arm including tracking-filling means operative to engage the ground along a depressed wheel track of said wheeled structure and to at least partially fill said wheel track by displacing at least some ground material thereinto from at least one side of the track as said wheeled structure moves forwardly along the ground, an elongated lever, pivot means pivotally supporting said lever from the rear end portion of said arm for swinging about a second horizontal axis transverse to said lever and said directions between a rearwardly and downwardly inclined trailing position with rear end of said lever engaging the ground behind said track-filling means and an upright forwardly displaced position, said rear end of said lever including ground digging means operative to slide over the ground, at least substantially without digging thereinto, when said wheeled structure is forwardly moved over the ground and to dig into the ground when said wheeled structure is rearwardly moved over the ground and cause said lever to pivot in a first direction about said pivot means toward said upright position and to thereby elevate said second axis and the track-filling means supported from the rear end of said arm relative to said ground, and motion transmitting connecting means operatively connected between said lever, wheeled structure and arm, responsive to said lever being swung to said upright position, operative to exert a lifting force on the rear end portion of said arm responsive to swinging of said lever in said first direction from said trailing position toward said upright position, whereby an equilibrium of forces is achieved between the force developed by frictional engagement of said digging means with the ground during said rearward movement tending to further swing said lever in said first direction and the force exerted on said rear end portion of said arm by said connecting means to further elevate the rear end portion of said arm, and thus said ground digging means relative to said structure, which further elevation of said ground digging means functions to reduce said frictional engagement and thus said force tending to further pivot said lever in said first direction.