The United States Patent and Trademark Office has officially granted US Patent Number 12,644,505 for an “Adjustable stroke device with cam” to Lake Country Tool, LLC, a pioneering engineering and manufacturing firm located in Oconomowoc, Wisconsin. Developed by visionary inventors Scott S. McLain and Mark Snyker, this proprietary mechanism introduces a revolutionary approach to stroke radius modification, offering a monumental leap forward for industrial machinery, consumer power tools, and high-precision surface refinement equipment.
In recognition of its outstanding engineering merit and regional industrial impact, this breakthrough has been honored as the Wisconsin State Patent of the Month for July 2026. This prestigious accolade highlights the invention’s sophisticated solution to a pervasive engineering challenge: achieving seamless, on-the-fly adjustments to a tool’s stroke orbit without causing catastrophic mechanical imbalance or excessive operator fatigue due to intense vibrations.
The Mechanics Behind the Innovation
At the core of Patent 12,644,505 is an elegant configuration designed to solve the balancing issues inherent in multi-functional orbital tools. Traditional handheld polishers and sanders are limited to a single fixed stroke length, or they require tedious teardowns to manually change counterweights when switching orbits. Lake Country Tool’s design bypasses these limitations through a dynamically shifting internal layout. The device features a specialized housing with a central axis and an enclosed cavity that contains a movably disposed counterweight alongside a mounting assembly equipped with a workpiece attachment mechanism.
What makes this system exceptionally innovative is its integrated stroke adjustor. By coupling the counterweight directly to the mounting assembly via a unique cam architecture, the stroke adjustor enables both components to move symmetrically relative to one another. As the user or automated control varies the distance between the counterweight and the mounting assembly, the stroke radius of the workpiece attachment mechanism is altered with respect to the central axis. This simultaneous adjustment ensures that the tool maintains a state of near-perfect dynamic balance across an entire range of stroke options: from fine finishing to aggressive material removal.
Why It Captured the July 2026 Patent of the Month
The selection committee for Wisconsin’s Patent of the Month chosen for July 2026 noted that Lake Country Tool, LLC successfully solved a major industrial pain point. By mitigating vibration through self-adjusting geometry, this invention dramatically improves tool safety, reduces user fatigue, and protects expensive internal bearings from premature wear. This mechanical adaptability paves the way for a single power tool to seamlessly transition between rotary, forced dual-action, and random orbital modes without sacrificing ergonomic comfort or performance consistency.
Leveraging the U.S. R&D Tax Credit for Practical Applications
The practical implementation and continuous commercialization of this patented technology provide excellent opportunities for companies to claim the U.S. Credit for Increasing Research Activities (commonly known as the R&D Tax Credit under IRC Section 41). To qualify, a business’s activities must pass a rigorous four-part test: they must be technological in nature, aim to create a new or improved product or process, eliminate technical uncertainty, and involve a process of experimentation. In the context of this patent, activities such as performing advanced kinematic modeling of the cam profiles, conducting finite element analysis (FEA) to evaluate stress distribution on the moving counterweights, and fabricating prototype housings to test vibration dampening thresholds directly qualify. Furthermore, wages paid to mechanical engineers, expenditures on prototyping materials, and costs associated with testing the tool across variable rotational speeds represent qualified research expenses (QREs). By carefully documenting these engineering iterations, companies can substantially lower their federal tax liability while advancing state-of-the-art power tool design.
