Smooth flow seed tube for agricultural planters

Planting – Drilling – Having depositor feature

Reexamination Certificate

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Details

C111S903000

Reexamination Certificate

active

07426894

ABSTRACT:
A seed tube for an agricultural planter has a top entrance, a bottom exit, front and rear walls, and sidewalls. A lower seed tube locator fits around the main body of the seed tube as a separate component and provides a lower attachment point for the seed tube. The front wall of the seed tube is free of substantial molded structures that would tend to create a sink or warp the interior surface of the front wall during molding. A sensor is mounted to the seed tube to face an exterior surface of the front wall. Light is transmitted and received by the sensor through the front wall to detect seeds passing through the seed tube. The interior surface of the front wall is smooth, uninterrupted and sink-free to avoid any obstructions that might alter the trajectory of the falling seeds, thereby increasing the seed spacing accuracy of the planter.

REFERENCES:
patent: 4157468 (1979-06-01), Primiano
patent: 4162744 (1979-07-01), Barker et al.
patent: 4431257 (1984-02-01), Born
patent: 4915258 (1990-04-01), Olson
patent: 5533458 (1996-07-01), Bergland et al.
patent: 5607225 (1997-03-01), Halvatzis
patent: 5650609 (1997-07-01), Mertins et al.
patent: 5883383 (1999-03-01), Dragne
patent: 6332413 (2001-12-01), Stufflebeanm et al.
patent: 7004090 (2006-02-01), Swanson
patent: 2007/0084387 (2007-04-01), Mariman et al.
“Bullseye Seed Tube” advertisement, Successful Farming, Jan. 2007.

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