Harvester reel having adjustable tine bars and method for resetting same

Cory Hunt, Millersville, PA (US); Jeffrey Trowbridge, Stevens, PA (US)

USPTO: us-12660755 · published 2026-06-23 · patents · A01D 57/12· A01D 34/14

Harvester reel having adjustable tine bars and method for resetting same

Cory Hunt, Millersville, PA (US) , Jeffrey Trowbridge, Stevens, PA (US) This is my paper

Pith reviewed 2026-06-24 20:00 UTC · model grok-4.3

classification patents A01D 57/12A01D 34/14

keywords harvester reeltine barscam assemblydivertersecondary camtine retractioncutterbaragricultural header

0 comments

The pith

A biased diverter engages a secondary cam to retract tines at an acute angle, enlarging clearance so the cutterbar cannot contact the tine.

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

The patent describes a harvester reel with a central shaft and multiple tine bars carrying tines and cam followers. A cam assembly combines a primary cam with a secondary cam that has an attached diverter movable between disengaged and engaged positions. The diverter is biased toward the engaged position, where it works with the secondary cam to pivot the cam follower and retract each tine along its longitudinal axis into a cammed state at an acute angle to the reel perimeter. This produces an enlarged opening among the reel tine bars, the retracted tine, and the cutterbar that prevents any contact. The arrangement also supports a method for resetting the tine bars by selective engagement of the diverter.

Core claim

The invention provides a cam assembly for guiding rotation of reel tine bars that comprises a primary cam associated with a primary tine bar guiding mechanism and a secondary cam associated with a secondary tine bar guiding mechanism together with a diverter operably attached to the secondary cam. The diverter is selectively movable between a disengaged position in which the secondary cam does not guide rotation of the tine bars and an engaged position in which the secondary cam does guide rotation of the tine bars. The diverter is biased toward the engaged position and operates in conjunction with the secondary cam in pivoting the cam follower that enables retraction of the tine along a cen

What carries the argument

The diverter biased toward the engaged position that works with the secondary cam to pivot the cam follower and retract the tine along its longitudinal axis into an acute-angle cammed state.

If this is right

The secondary cam can be selectively activated only when needed while the primary cam handles normal guiding.
Tine retraction occurs along the central longitudinal axis to produce the acute-angle position relative to the reel perimeter.
The enlarged opening prevents contact between the tine and the cutterbar during reel rotation.
Disengaging the diverter returns control to the primary cam for resetting the tine bars.

Where Pith is reading between the lines

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

The bias toward engagement creates a default safety state that activates the retraction feature unless the diverter is deliberately held disengaged.
The dual-cam arrangement with a movable diverter provides a way to switch between two distinct guiding paths without stopping rotation.
The acute-angle retraction geometry directly links cam follower motion to clearance management between the reel and the cutterbar.

Load-bearing premise

The mechanical components including the diverter, cams, and cam followers can be manufactured and operated without binding, wear, or failure under field conditions of vibration, dust, and varying loads.

What would settle it

Observation during operation that the tine still contacts the cutterbar even when the diverter is engaged and the tine is retracted to the acute angle, or that the diverter fails to reach or stay in the engaged position.

read the original abstract

1 . A harvester reel of an agricultural harvester header comprising: a central rotatable shaft; a plurality of reel tine bars extending widthwise across the harvester reel and connected to the central rotatable shaft for rotation therewith, each of the plurality of reel tine bars comprising a cam follower and a tine; and a cam assembly selectively guiding rotation of the plurality of reel tine bars; wherein the cam assembly comprises a primary cam associated with a primary tine bar guiding mechanism and a secondary cam associated with a secondary tine bar guiding mechanism and a diverter operably attached to the secondary cam; wherein the diverter is selectively movable between a disengaged position, in which the secondary cam does not guide rotation of the tine bars, and an engaged position, in which the secondary cam does guide rotation of the tine bars; and wherein the diverter is biased toward the engaged position and operates in conjunction with the secondary cam in pivoting the cam follower that enables retraction of the tine along a central longitudinal axis into a cammed state with the retracted tine being positioned at an acute angle to the perimeter of the harvester reel, resulting in an enlarged opening between the plurality of reel tine bars, the tine, and a cutterbar that does not enable contact between the cutterbar and the tine.

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 is a utility patent on a dual-cam diverter system for retracting tines on a harvester reel, with a clear mechanical description but zero performance data.

read the letter

This patent describes a harvester reel where tines can retract axially via a primary cam for normal operation and a secondary cam engaged by a biased diverter. When the diverter moves into position it pivots the cam follower so the tine pulls back along its axis and sits at an acute angle to the reel perimeter, creating clearance with the cutterbar.

The specific arrangement of the selectively movable diverter working with the secondary cam to produce that angled retraction is the part that looks new in the claims. The description spells out the kinematics step by step: diverter positions, how engagement changes the guidance path, and the resulting geometry that keeps the tine from hitting the cutterbar.

The write-up is straightforward on the functional layout and does a decent job making the motion sequence understandable from the text alone.

The main limitation is that nothing is tested or measured. There are no force calculations, no durability checks under vibration or dust, and no comparison to existing reel designs. The assumption that the parts will move freely without binding or wearing out is simply asserted. Because this is a patent specification rather than a research paper, those gaps are expected but still leave the practical value unproven.

This is aimed at mechanical engineers who design or maintain combine headers and might need to work around or license the configuration. It has little to offer readers outside that narrow equipment niche.

It does not need academic peer review. Treat it as a patent filing if you track prior art in agricultural machinery; otherwise it can be set aside.

Referee Report

0 major / 0 minor

Summary. The manuscript is a utility patent specification for a harvester reel in an agricultural harvester header. It describes a central rotatable shaft connected to multiple reel tine bars (each with a cam follower and tine) and a cam assembly comprising a primary cam, a secondary cam, and a diverter. The diverter is biased toward an engaged position in which the secondary cam guides tine bar rotation, pivoting the cam follower to retract each tine along its central longitudinal axis into a cammed state at an acute angle to the reel perimeter. This produces an enlarged opening between the reel tine bars, the retracted tine, and the cutterbar that prevents contact between the cutterbar and the tine.

Significance. If the mechanism operates as described, it could represent a design approach for selective tine retraction in harvester reels to avoid cutterbar interference. However, the manuscript provides only a structural and functional description with no performance data, testing results, error analysis, or validation. No machine-checked proofs, reproducible code, parameter-free derivations, or falsifiable predictions are present, so the practical significance cannot be assessed from the content.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for reviewing the manuscript. We note that this is a utility patent specification describing a novel harvester reel mechanism, which by design and legal requirement focuses on a complete structural and functional disclosure rather than empirical testing or scientific validation data.

read point-by-point responses

Referee: The manuscript provides only a structural and functional description with no performance data, testing results, error analysis, or validation.

Authors: Patent specifications are governed by legal standards requiring a written description that enables a person skilled in the art to make and use the invention without undue experimentation. The provided description details the central shaft, reel tine bars with cam followers and tines, primary and secondary cams, biased diverter, and the resulting enlarged opening to prevent cutterbar contact. This meets enablement requirements; performance data or testing is not a prerequisite for patentability and is outside the scope of a patent filing. revision: no
Referee: No machine-checked proofs, reproducible code, parameter-free derivations, or falsifiable predictions are present, so the practical significance cannot be assessed from the content.

Authors: Utility patents do not require scientific proofs, code, or falsifiable predictions; they require a clear description of the inventive concept and its operation. The practical significance is the selective tine retraction via the biased diverter and secondary cam to create an acute-angle cammed state, enlarging the opening between tine bars and cutterbar. Patent examination assesses significance based on novelty, utility, and non-obviousness rather than experimental validation. revision: no
Referee: Recommendation: reject

Authors: We respectfully disagree with the rejection recommendation. The manuscript discloses a specific mechanical solution to cutterbar interference in harvester reels through the combination of primary/secondary cams and biased diverter, which represents a patentable advance in agricultural machinery design. revision: no

Circularity Check

0 steps flagged

No significant circularity; patent is a direct mechanical specification

full rationale

The document is a utility patent whose central claim is a structural/functional description of a cam-and-diverter mechanism. It contains no equations, derivations, fitted parameters, hypotheses, or self-citations. The description does not assert any predictive result whose truth value depends on prior steps within the same document; the claim is self-contained as a specification of components and their interactions. No load-bearing step reduces to its own inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No free parameters, axioms, or invented entities in the scientific sense; the document is a mechanical design specification with no fitted values or postulated entities.

pith-pipeline@v0.9.1-grok · 5777 in / 1006 out tokens · 21601 ms · 2026-06-24T20:00:25.683144+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Foundation/RealityFromDistinction reality_from_one_distinction unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

the diverter is biased toward the engaged position and operates in conjunction with the secondary cam in pivoting the cam follower that enables retraction of the tine along a central longitudinal axis into a cammed state with the retracted tine being positioned at an acute angle to the perimeter of the harvester reel, resulting in an enlarged opening between the plurality of reel tine bars, the tine, and a cutterbar that does not enable contact between the cutterbar and the tine

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.