Patent ID: 6647904
Filing Date: 2003-11-18
Classification: A01B,A01C,Y10T

Abstract:
A planting unit lockup assembly for a planting unit having a parallelogram linkage being provided with an upper link and a lower link, the lockup assembly comprising:a lockup link extending between the upper link and the lower link, the lockup link being pivotally mounted to the upper link by an upper pivot, the lockup link having a hook; the lower link having a member that bears against the lockup link; a control link is pivotally coupled to the lockup link between the upper pivot and the hook, the control link being biased towards the lower link by a spring, the control link having two positions for engaging the lockup link, a normal position whereby the control link biases the hook of the lockup link away from the member and a lockup position whereby the control link biases the hook of the lockup link towards the member.