Patent ID: 8333058

Claim:
A method of suspending a header from a towed implement to permit the header to float, the towed implement comprising a main frame, a sub-frame comprising a first side and a second side, and a four-bar linkage system comprising an upper link, a lower link, and an actuator, the method comprising: (a) operatively, pivotally attaching a first end of the upper link of the four-bar linkage system to the main frame of the towed implement using a first spherical bearing; (b) operatively, pivotally attaching a second end of the upper link to the first side of the sub-frame using a second spherical bearing; (c) operatively, pivotally attaching a first end of the lower link of the four-bar linkage system to the main frame using a first cylindrical bearing; (d) operatively, using a third spherical bearing to pivotally attach a second end of the lower link to the first side of the sub-frame in an orientation so that the lower link and upper link are not parallel; (e) operatively, pivotally attaching the actuator to the first side of the sub-frame for raising and lowering the sub-frame; and (f) operatively attaching the header of the towed implement to the second side of the sub-frame.