Patent ID: 11889784
Assignee: G.B.G.I., INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC A | IPC A

Claim 19:
20. A lower planting arm of a row unit, comprising:
a first linkage arm having a first opening defined at a first end of the first linkage arm and a second opening defined at a second end of the first linkage arm opposite to the first end of the first linkage arm;
a second linkage arm parallel with the first linkage arm and having a first opening defined at a first end of the second linkage arm and a second opening defined at a second end of the second linkage arm opposite to the first end of the second linkage arm;
a first bracket fixedly engaging with the first linkage arm and the second linkage arm at a first position;
a second bracket fixedly engaging with the first linkage arm and the second linkage at a second position opposite to the first position; wherein each of the first bracket and the second bracket is adapted to operably engage with an actuating device of the row unit;
a first pair of outer bushings operably engaged with the first linkage arm inside of the first opening of the first linkage arm and the second opening of the first linkage arm, wherein each outer bushing of the first pair of outer bushings defines a first material;
a first pair of attachment assemblies operably engaging the first linkage arm with a mounting plate of the row unit and a head frame of the row unit;
each attachment assembly of the first pair of attachment assemblies comprises:
a connector;
a washer operably engaged with the connector and defining a second material; and
an inner bushing operably engaged with the connector and defining a third material;

wherein the first material is harder than the second material and the third material.