Patent ID: 7360353

Claim:
A spring assembly for mounting a wheel on a wheel rake boom comprising: a rake wheel arm having one end adapted to receive the rake wheel such that the wheel can turn freely and another end adapted to be pivotally connected to the wheel rake boom; a tension spring having first and second ends; a first insert connected to the first end of the spring; a rod, having a first end and a second end, positioned within the tension spring, wherein the first end extends out of the first end of the spring through the first insert and the second end extends out of the second end of the spring, such that the first insert and the second end of the spring slide freely on the rod, the first end of the rod being adapted to be connected to a mechanism to control its movement; a first stopper fixed to the rod between the first insert and the second end of the spring, the first stopper limiting the movement of the first insert along the rod in the direction of the second end of the spring; and a further arm having first and second ends, the first end fixed to the rake wheel arm and the second end pivotally coupled to the second end of the spring, whereby the tension spring permits the rake wheel to move vertically to follow a terrain contour.