US 12,133,480 B2
Variable tooth coulter blade with sized inserts
Richard L. Christie, Clarinda, IA (US); and Ryan J. K. Christie, Clarinda, IA (US)
Assigned to PRESCRIPTION TILLAGE TECHNOLOGIES, LLC, Lamoni, IA (US)
Filed by Prescription Tillage Technology, LLC, Red Oak, IA (US)
Filed on Feb. 12, 2019, as Appl. No. 16/273,996.
Application 16/273,996 is a continuation in part of application No. 16/115,061, filed on Aug. 28, 2018, granted, now 10,820,462.
Application 16/115,061 is a continuation in part of application No. 14/998,442, filed on Jan. 4, 2016, granted, now 10,506,754.
Application 14/998,442 is a continuation in part of application No. 14/961,849, filed on Dec. 7, 2015, granted, now 10,159,171.
Application 14/961,849 is a continuation of application No. 14/590,855, filed on Jan. 6, 2015, granted, now 9,204,588, issued on Dec. 8, 2015.
Application 14/590,855 is a continuation of application No. 14/162,259, filed on Jan. 23, 2014, abandoned.
Claims priority of provisional application 61/756,841, filed on Jan. 25, 2013.
Prior Publication US 2019/0261549 A1, Aug. 29, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. A01B 23/06 (2006.01); A01B 15/18 (2006.01); A01B 33/10 (2006.01); A01C 5/06 (2006.01)
CPC A01B 23/06 (2013.01) [A01B 15/18 (2013.01); A01B 33/103 (2013.01); A01C 5/064 (2013.01)] 36 Claims
OG exemplary drawing
 
1. A coulter blade for altering soil and surface stubble, comprising:
a discoidal coulter blade having a blade circumference forming a blade outer edge, lateral sides and a blade center point and being configured for detachably mounting to an implement;
a plurality of teeth configured proximal to and integral with the blade circumference, each one of the plurality of teeth having a rounded gullet and an intersecting bevel adjacent thereto, each one of the plurality of teeth, gullet and bevel having a cutting edge and a back edge; extending outward toward the blade circumference to a point so that each one of the plurality of teeth forms a cupped bevel tooth for piercing the soil and rotating the discoidal coulter blade, the back edge longitudinally opposite the cutting edge, the cutting edge extending away from the blade circumference continuing to the adjacent gullet, the back edge extending away from the blade circumference continuing to an adjacent gullet, the cutting edge configured to cut the surface stubble and the soil, the back edge configured for driving the discoidal coulter blade parallel to the surface as the soil acts on the back edge, the cutting edge continuing through the gullet, the gullet being rounded to continue the cut begun by the cutting edge;
one or more of the lateral sides having said bevel sharpened at a first bevel angle, the bevel being an inside bevel located at a location between the blade center point and the blade outer edge;
the cutting edge having a curved shape extending from a tooth tip into the gullet and along at least a portion of the back edge;
a linear tooth area and a blade circumference area, said linear tooth area being longer than said blade circumference area to increase shearing and cutting action per revolution of said coulter blade blade versus linear distance traveled;
whereby said discoidal coulter blade rotationally interacts with the soil to translate in a forward direction.