Stump chipper and method for the operation thereof

Woodworking – Process – Stump removing

Reexamination Certificate

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Details

C037S302000, C144S024120

Reexamination Certificate

active

06230770

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a stump chipper for at least partially removing a stump and the like from the ground by means of chipping, comprising a subframe that can be positioned on the ground and that supports a movable arm at the end of which a chipping wheel is mounted such that it is rotatable about its axis, which chipping wheel is also rotatable with respect to the arm about an axis oriented transversely to the axis of the chipping wheel.
2. Description of the Related Art
Such a stump chipper is disclosed in U.S. Pat. No. 5,555,652. The known stump chipper has an arm that can be swung back and forth on the subframe, such that the rotating chipping wheel is movable transversely over the stump. As the stump is chipped further and further away the arm also makes a lowering movement, such that the chipping wheel can continue to chip away the stump.
Although the known stump chipper is suitable for its job, the operation thereof remains demanding, intensive work. Operators must continually make sure that the chipping wheel remains above the stump when moving back and forth. After some time the concentration required for this can no longer be maintained, as a result of which the work is adversely affected.
A significant disadvantage, with which the above is associated, is also the restricted work rate of the known stump chipper. As a consequence of the back and forth movement, the action of the known chipper is of a discontinuous nature. The speed with which a stump can be removed therefore remains restricted.
SUMMARY OF THE INVENTION
The aim of the invention is to provide a stump chipper which does not have these disadvantages. This aim is achieved in that the chipping wheel is continuously rotatable in one and the same direction about the axis oriented transversely to the axis of the chipping wheel, in particular through at least 360°.
In the case of the stump chipper according to the invention the chipping wheel does not have to make a back and forth movement over the stump but can simply be brought into rotation transversely to its own axis. This rotation can be maintained until the desired depth has been reached.
The action of the stump chipper according to the invention is of a continuous nature. Consequently the work rate is high.
It is also an advantage that it is no longer necessary accurately to check that the chipping wheel is not swinging through too far, away from the stump. The stump chipper according to the invention is able independently to chip away the stump to a pre-set depth, intervention by the operators being needed only after this.
Operation is consequently less demanding on the operators; a considerable degree of automation is even possible.
In connection with the removal of larger, thick stumps, the chipping wheel can be movable transversely to both its axis and the axis of rotation. The chipping wheel can be displaced from the centre of the pivot ring, so that the chipping range can be adjusted to the diameter of the stump.
According to a preferred embodiment the chipping wheel can have been mounted on an articulated arm, the first arm section of which is connected to the subframe such that it can move up and down, which first arm section supports a second arm section, at the end of which the chipping wheel is located. The second arm section can be pivoted relative to the first arm section about a shaft parallel to the axis of the chipping wheel.
The invention also relates to a method for removing a stump from the ground by means of a device as described before, comprising the following steps:
rotating the chipping wheel about its axis to cut away the material of the stump,
simultaneously rotating the chipping wheel about the axis of rotation transverse to the axis of the chipping wheel,
lowering the chipping wheel.
The desired results, that is to say simple, effective removal of the stump, can best be achieved if the chipping wheel is rotated through at least 360° about the axis of rotation transverse to the axis of the chipping wheel and is continuously rotated in one and the same direction about the axis of rotation transverse to the axis of the chipping wheel.


REFERENCES:
patent: 5203388 (1993-04-01), Bowling
patent: 5435359 (1995-07-01), Craft
patent: 5555652 (1996-09-01), Ashby
patent: 5655581 (1997-08-01), Craft
patent: 5743314 (1998-04-01), Puch
patent: 6003570 (1999-12-01), Falatok et al.
patent: 6014996 (2000-01-01), Egging et al.
patent: 2 293 303 (1996-03-01), None

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