Patent ID: 6019178
Filing Date: 2000-02-01
Classification: A01B

Abstract:
A field marker, comprising:an inner arm having a proximal end and a distal end, wherein said proximal end is pivotally attached to a bracket means which is attachable to an implement frame;an outer arm having a proximal end and a distal end, wherein said proximal end of said outer arm is pivotally attached to said distal end of said inner arm;a marking means attached to said distal end of said outer arm;a first hydraulic cylinder attached between said bracket means and said inner arm, wherein said first hydraulic cylinder pivots said inner arm with respect to said implement frame;a second hydraulic cylinder attached between said inner arm and said outer arm, wherein said second hydraulic cylinder pivots said outer arm with respect to said inner arm; andwherein said first hydraulic cylinder and said second hydraulic cylinder are fluidly connected in series to one another so that they operate substantially simultaneously to extend or retract said inner arm and said outer arm with respect to said implement frame.