Connecting rod

A connecting rod for a pull-type agricultural tillage device, comprising:

• a. a center frame positioned between a pair of inner wings, said center frame connected to each said inner wings by a universal joint, said universal joint supported on the center frame by a spherical bearing and a pivot;
• b. a bracket affixed to the center frame, said bracket having a slot for allowing said pivot to move;
• c. a pair of differential bars, each bar slideably attached to the center frame;
• d. a spring assembly for controlling the movement of each differential bar, further comprising:
• i. a spring co-axial to each differential bar:
• ii. an inner stop block and an outer stop block, said stop blocks attached to the center frame and slideably supporting the differential bar:
• iii. an inner sliding block slideably attached to the differential bar, said inner sliding block for compressing said spring:
• iv. an outer sliding block affixed to the differential bar, said outer sliding block contacting the inner slide block:
• and
• v. a pair of tie rods, each tie rod affixed to the inner stop and outer stop;
• e. a tongue assembly which can prevent the movement of each differential bar, further comprising:
• i. a tongue pivotally affixed to a hitch center frame, said tongue capable of rotating and contacting the differential bar:
• and
• ii. a tongue spring for biasing the tongue towards the differential bar:
• and
• f. a ‘L’-shaped linkage pivotally attached to the center frame and differential bar, said linkage controlling the motion of the pivot in the slot.