Agricultural implements having row unit position sensors and at least one adjustable wheel, and related control systems and methods

Benjamin Anson Fanshier, Hesston, KS (US); Monte J. Rans, Hesston, KS (US); Robert L. Figger, Hesston, KS (US); Ross Duerksen, Hesston, KS (US); Zane Wesley Unrau, Hesston, KS (US)

USPTO: us-12648502 · published 2026-06-09 · patents · A01B 63/22· A01B 63/002· A01C 7/203

Agricultural implements having row unit position sensors and at least one adjustable wheel, and related control systems and methods

Benjamin Anson Fanshier, Hesston, KS (US) , Monte J. Rans, Hesston, KS (US) , Ross Duerksen, Hesston, KS (US) , Zane Wesley Unrau, Hesston, KS (US) , Robert L. Figger, Hesston, KS (US) This is my paper

Pith reviewed 2026-06-09 16:00 UTC · model grok-4.3

classification patents A01B 63/22A01B 63/002A01C 7/203

keywords agricultural implementrow unitparallel linkagerotary sensortoolbar positionheight adjustmentactuatordepth control

0 comments

The pith

An agricultural implement senses toolbar position via the angle of a row unit's parallel linkage and uses that reading to drive an actuator that raises or lowers the frame relative to a leading wheel.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The patent describes a machine that keeps its toolbar at a consistent height above the ground while row units work the soil. A frame carries an integrated toolbar with row units attached through parallel linkages; a wheel sits ahead of the toolbar, a rotary sensor reads the angle of one linkage member, and an actuator changes the frame height based on the sensor output. The design aims to let the row units stay in ground contact as the implement travels over uneven fields. A sympathetic reader cares because the system replaces manual or separate height controls with a single linkage-based measurement that could simplify depth management during planting or tillage.

Core claim

The agricultural implement comprises a frame having a fixed rigid structure including a drawbar, a hitch, and an integrated elongate toolbar, the toolbar carrying at least one row unit coupled to the toolbar by a parallel linkage; at least one wheel coupled to the frame at a position leading the toolbar; a rotary sensor configured to sense a position of the toolbar relative to ground when the at least one row unit is in contact with the ground by measuring an angle of an element of the parallel linkage; and an actuator configured to raise or lower the frame relative to the at least one wheel based at least in part on a sensed position of the toolbar.

What carries the argument

Rotary sensor that measures the angle of an element in the row unit's parallel linkage to indicate toolbar position relative to ground.

If this is right

The actuator can change frame height in real time using only the linkage angle rather than separate ground sensors.
Row units remain in contact with the ground while the frame height is corrected through the leading wheel.
The parallel linkage itself becomes the primary sensing element for toolbar position.
Control logic can command the actuator directly from the rotary sensor output without additional calibration for each row unit.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same linkage-angle approach might be adapted to other toolbar-mounted tools that already use parallel linkages for depth control.
If the sensor proves stable, it could reduce the total number of sensors needed on wide implements.
The method assumes the leading wheel provides a stable reference; a different wheel placement could alter how well the angle reading translates to ground distance.

Load-bearing premise

The angle measured at the parallel linkage reliably tracks the toolbar's actual height above the ground even when soil conditions, linkage wear, or row-unit load change.

What would settle it

Run the implement across a field with known, measured elevation changes while logging both the sensor angle and independent measurements of toolbar height; the claim fails if the actuator adjustments do not keep row-unit depth within a stated tolerance.

read the original abstract

1 . An agricultural implement, comprising: a frame having a fixed rigid structure including a drawbar, a hitch, and an integrated elongate toolbar, the toolbar carrying at least one row unit coupled to the toolbar by a parallel linkage; at least one wheel coupled to the frame at a position leading the toolbar when the implement travels in a normal forward direction of travel; a rotary sensor configured to sense a position of the toolbar relative to ground when the at least one row unit is in contact with the ground by measuring an angle of an element of the parallel linkage; and an actuator configured to raise or lower the frame relative to the at least one wheel based at least in part on a sensed position of the toolbar.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This patent describes a mechanical configuration for depth control on row crop implements using a rotary sensor on the parallel linkage to drive wheel adjustment, but contains no data or validation.

read the letter

This patent is about an agricultural implement that uses a rotary sensor on the parallel linkage of a row unit to sense the position of the toolbar relative to the ground, and then uses that information to control an actuator that raises or lowers the frame via a leading wheel. The thing that is actually new here is the specific integration of the rotary sensor measuring the angle of a linkage element to infer toolbar position, combined with the actuator on the leading wheel for adjustment. It builds on standard parallel linkage designs common in planters by adding this sensing and control loop. The description does a solid job of specifying the hardware elements and their relationships in the claim language. The components are listed clearly: the frame with toolbar, the row unit on parallel linkage, the leading wheel, the rotary sensor, and the actuator. Where it falls short is in providing any kind of validation or discussion of the system's performance. There are no measurements of how accurately the angle correlates with actual depth, no consideration of factors like soil variation, linkage play, or sensor calibration over time. The assumption that the angle measurement gives a good indication of position is central but untested in the document. For a patent this is typical, as they focus on the structure rather than empirical proof. Overall, this is the kind of thing that might interest mechanical engineers or product developers in the farm equipment industry who are tracking new patent filings in precision planting technology. It could serve as prior art or inspiration for similar systems. However, it lacks the data or analysis that would make it relevant for scientific or academic audiences. I would not bring this to the next reading group. I would not cite this in my own work in the next 12 months. It does not deserve to be sent for peer review because it is a patent document presenting a configuration rather than research findings with evidence or derivations.

Referee Report

0 major / 0 minor

Summary. The manuscript is a US patent application claiming an agricultural implement with a rigid frame including drawbar, hitch and toolbar; at least one row unit attached to the toolbar by parallel linkage; at least one leading wheel; a rotary sensor that measures an angle of an element of the parallel linkage to sense toolbar position relative to ground when row units contact the ground; and an actuator that raises or lowers the frame relative to the wheel based on the sensed position.

Significance. If the described mechanical configuration operates as specified, it could provide a linkage-based sensing approach for toolbar height control in agricultural equipment. The document contains no performance data, error analysis, validation experiments, or quantitative assessment of sensor accuracy under field conditions, so its contribution to the scientific literature is limited to a structural description without empirical or analytical support.

Simulated Author's Rebuttal

2 responses · 0 unresolved

Thank you for the opportunity to respond to the referee's report. This document is a US patent application (arXiv:patent/us-12648502) whose purpose is to describe and claim a novel mechanical configuration for an agricultural implement. It is not a scientific manuscript and does not purport to present experimental results or performance data.

read point-by-point responses

Referee: The document contains no performance data, error analysis, validation experiments, or quantitative assessment of sensor accuracy under field conditions, so its contribution to the scientific literature is limited to a structural description without empirical or analytical support.

Authors: We agree that the application contains no performance data or field validation, as none is required or appropriate for a patent application. The statutory purpose of a patent is to provide an enabling description of the invention so that a person skilled in the art can practice it. The claimed subject matter is the specific combination of a rotary sensor mounted to measure an angle in the parallel linkage (to infer toolbar height when row units are in ground contact) together with an actuator that adjusts wheel position relative to the frame. This structural and functional disclosure constitutes the contribution; empirical testing is outside the scope of patent disclosure requirements. revision: no
Referee: REFEREE RECOMMENDATION: reject

Authors: We believe rejection is not warranted because the referee appears to have evaluated the document against criteria applicable to scientific papers rather than patent applications. The application meets the requirements for patentability by describing a new and useful apparatus with sufficient particularity. revision: no

Circularity Check

0 steps flagged

No significant circularity

full rationale

The document is a patent whose central claim is a structural configuration of an agricultural implement (frame with toolbar and parallel-linkage row unit, leading wheel, rotary angle sensor on the linkage, and actuator). No equations, fitted parameters, predictions, derivations, or self-citations appear in the provided text. The description is a self-contained mechanical specification that asserts the sensor is configured to sense toolbar position via angle measurement but contains no testable scientific assertions, performance claims, or reductions that could be circular. The reader's weakest_assumption identifies a practical limitation but is not load-bearing for the legal claim, which requires only enablement of the described structure.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No mathematical model, free parameters, axioms, or invented physical entities are introduced. The document is a mechanical design description.

pith-pipeline@v0.9.1-grok · 5722 in / 1064 out tokens · 28078 ms · 2026-06-09T16:00:35.230456+00:00 · methodology

Agricultural implements having row unit position sensors and at least one adjustable wheel, and related control systems and methods

Core claim

What carries the argument

If this is right

Where Pith is reading between the lines

Load-bearing premise

What would settle it

discussion (0)