# US 8,783,308 B2 · Stump cutter

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- Number: US 8,783,308 B2
- Document ID: US8783308B2
- Status: Granted
- Kind: B2
- Application number: 12/741,807
- Filed: 2008-11-04
- Published: 2010-12-16
- Granted: 2014-07-22
- Earliest claimed: 2007-11-06
- Assignees: Vermeer Manufacturing Company
- Applicants: Gary Wayne Kappel; Christopher Allen Pfoltner; Brent Allen Bartels; Mark A. Rieckhoff
- Inventors: Gary Wayne Kappel; Christopher Allen Pfoltner; Brent Allen Bartels; Mark A. Rieckhoff
- Web page: https://patentgrep.com/patent/US8783308B2

## CPC

- A01G 23/067: {by comminuting the tree stumps}
- A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12)

## Abstract

The present disclosure provides a device and method that enable the efficient reduction of stumps. In one embodiment the stump removal methods and devices according to the present disclosure allow the operator to have a clear view of the work area during operation, and the ability to move the reduction device through a wide range of motion during operation. In one embodiment, the material reduction tool pivots relative to the chassis in the vertical plane about multiple pivot points. In some embodiments the device includes a retractable auxiliary control panel located at the end of the device opposite the material reduction tool. The control panel enables the operator to direct the movement of the device from the end of the device and thereby enable the device to maneuver through narrow spaces.

## Claims

### Claim 1

A stump reducing machine comprising:
a chassis;
an engine supported on the chassis;
a stump reducing structure including a stump cutting wheel rotatable about a wheel axis, the stump reducing structure also including a plurality of stump cutters mounted about a periphery of the stump cutting wheel;
a swing arm assembly movable relative to the chassis about a swing axis, the swing arm assembly including a four member pivot linkage including a mounting member, a first linkage, a pivot linkage and a third linkage, third linkage being spaced from the mounting member, the first linkage being spaced from the second linkage, the first and second linkages being configured to pivotally connect the third linkage to the mounting member;
the mounting member being positioned adjacent to the swing axis;
a motor supported by the third linkage;
a drive shaft that connects the motor to a gear assembly that drives rotation of the stump cutting wheel about the wheel axis, the drive shaft being contained within the third linkage and the stump reducing structure and the gear assembly being supported at a lower end of the third linkage;
an actuator for pivoting the four member pivot linkage to raise and lower the stump reducing structure relative to the chassis; and
wherein during stump reducing, the swing arm assembly configured such that it is pivots about the swing axis to swing the stump reducing structure back and forth relative to the chassis.

### Claim 2 (depends on 1)

The stump reducing machine of claim 1, further comprising a shroud for covering an upper portion of the stump cutting wheel, the shroud being pivotally movable relative to the third linkage.

### Claim 3 (depends on 2)

The stump reducing machine of claim 2, further comprising a shroud actuator for pivoting the shroud relative to the third linkage.

### Claim 4 (depends on 1)

The stump reducing machine of claim 1, wherein the four member pivot linkage defines four parallel pivot axes.

### Claim 5 (depends on 4)

The stump reducing machine of claim 4, wherein the wheel axis is parallel to the four parallel axes of the four member pivot linkage.

### Claim 6 (depends on 5)

The stump reducing machine of claim 5, wherein the four parallel axes of the four member pivot linage are substantially horizontal and the swing axis is substantially vertical.