Groundwork

The Sand Rake Has an Appointment To Keep

A golf course bunker rake, a 2001 solenoid plunger, and what happened when Deere replaced a mechanical interlock with a control unit that decides.

Clay-diorama editorial illustration of a sand-grooming cart on a miniature beach.

What changes in this design

Without this detail, a reader might assume that a vehicle backs up as soon as it receives an instruction to do so.

Here, a request to reverse is followed by an evaluation of the rake's position, and the rake is adjusted before the vehicle reverses.

It is worth knowing because it pinpoints the subject of the record: handling the rake's location when a backward movement is requested.

Use extra caution in backing up the vehicle

I went looking for the operator's manual of a bunker rake, the machine that grooms sand traps on golf courses. It weighs 950 pounds, puts 85 decibels at the operator's ear, and its safe-practices list is direct: "This machine demands your attention. To prevent loss of control or tipping of the vehicle: A. Use extra caution in backing up the vehicle. Ensure area is clear."

That's the control. A sentence. The manual never tells you to raise the rake before you reverse, and part of what's at risk isn't a person - drag a rake backwards through a bunker face and you tear the liner and the edge. A competing machine fits rubber trowels to reduce exactly that damage. Reverse is already capped in hardware, 4 or 5 mph against 10 or 11 forward.

The solenoid that solved this in 2001

Kevin L. Johnson filed a patent on 25 September 2001 for a small-engine maker, granted two years later. A solenoid pushes a plunger into the shift mechanism, and while the mower deck is engaged the machine physically cannot enter reverse. The filing is candid, to my eye: new industry standards were being considered to prevent exactly these injuries, and the two existing answers were both bad. Engines that shut themselves off were inconvenient. Manual override switches got bypassed. So, a plunger. You can see it, and you can fix it.

A control unit, filed 31 January 2025

Deere & Company filed the same idea as software. It published a month ago as "Sand Grooming Vehicle with Automated Rake Lift," five named inventors, classified with soil-working implements and their lifting gear. The control unit notices a request to reverse, checks where the rake is, and adjusts it before the machine moves. The strongest description of the mechanism goes further: reverse is prevented until the rake reaches a minimum height. The application carries no cited prior art, forward or backward, and I can't tell what that absence means.

Nothing requires this. Federal guidance for riding mowers names golf course maintenance and points at three consensus standards, and none of them asks that an implement be raised before reversing. The two deaths it documents were falls: off a retaining wall in 2004, and at least 100 feet down an embankment in 2012, on a machine that already had a rollover bar. This interlock is ahead of the rules, not compelled by them. What changed since 2001 isn't the hazard. It's who decides.

The month the repair suit landed

The same month this application was filed, the Federal Trade Commission and five states sued Deere over repair. They settled on 8 July 2026. For ten years, extendable on violation, the company has to give farmers and independent shops the same resources its authorised dealers get: reading and clearing fault codes, reprogramming components, pairing new parts, restarting machines after emissions limp-mode shutdowns. The commission's finding was that Deere makes the only software tools capable of performing all electronic repairs.

To my mind, that's the same category of thing. A plunger anyone can see becomes a control unit that decides, and then who is allowed to talk to the control unit becomes a ten-year consent order.

Second to last on the replacement list

Here's what unsettled me. The golf superintendents' association surveyed 7,842 of its members in 2025 and got 1,299 responses. Of thirteen equipment categories, the motorised bunker rake ranked second to last for replacement priority: 9 percent called it very high, 29 percent not a priority at all. What they want is to rebuild the bunkers themselves, the top capital project, done by 47 percent in the past three years at an average of $280,323.

The labour argument has softened too, I think. Superintendents calling the market bad or very bad fell from 63 percent in 2022 to 34 percent in 2025. And two manufacturers, one Dutch and one in Ontario, now sell robots that rake bunkers with nobody aboard, both claiming up to 90 percent labour savings with no published basis for the number. An unmanned machine needs no reverse interlock at all.

Where this leaves things

Mechanised sand grooming turns 90 this year. Two men filed in June 1936 for a tracked machine with a raking conveyor, and said plainly what it replaced: a large crew of men with hand rakes. Ninety years of that, and the frontier is a decision about rake height.

I don't think it's a bad patent. It's a small, careful fix on a machine that can do real damage in reverse, and turf is the part of this company's business currently growing. But the driverless tractor with sixteen cameras is the story being told about automation, and this is the automation that ships: one decision taken from a person still sitting in the seat, on the machine courses are least keen to replace, guarded by software instead of a plunger you could point at.

Sources

Reporting for this piece drew on the published filing and the references below.

The record, briefly. US20260223758A1, “Sand Grooming Vehicle with Automated Rake Lift” The abstract describes a sand-grooming vehicle that can evaluate rake position after a reverse request and adjust the rake before reversing.

More angles on this

The Leveling Bar Has a Very Firm Opinion About LevelAnother reading from the same A01B classification family, soil working in agriculture or forestry.
A Work Vehicle, Taking Its Job Quite PersonallyAnother reading from the same A01B classification family, soil working in agriculture or forestry.
CPC A01B: Soil working in agriculture or forestry; parts, details, or accessories of agricultural machines or implements, in generalThe official classification family this record was filed into, published in the USPTO Cooperative Patent Classification scheme.
The Seed Method's Extremely Serious Fresh StartAnother reading from the neighbouring A01C classification family, planting; sowing; fertilising.
Ruts Have Filed a Formal ComplaintAnother reading of a record filed by the same applicant, Deere & Company.

Read around this one:Public patent record USPTO published figure Patent issue-date index