Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven...
Reexamination Certificate
2000-02-15
2001-07-10
Matecki, Katherine A. (Department: 3653)
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
C254S266000, C248S163100, C248S168000
Reexamination Certificate
active
06257555
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to apparatus for applying pushing or pulling force and, more particularly, to portable implements for extracting stumps or poles from the ground.
BACKGROUND OF THE INVENTION
Wooden fence posts are often anchored to the ground by concrete. After prolonged exposure to the weather, these posts rot necessitating removal of the concrete “stump” so that replacement posts can be installed. Unfortunately, concrete stump removal is a backbreaking task most often performed by first digging a hole around the stump and, then, lifting the stump from the hole and onto a truck for off-site disposal. A pair of laborers can perform this procedure in several hours using hand tools like shovels and pry bars. Inadvertently dropping the stump onto the foot or leg of a laborer is not uncommon and can result in a serious injury.
SUMMARY OF THE INVENTION
In light of the problems associated with the prior art, it is a principal object of the invention to provide a lifting device that may be used to extract concrete stumps and other objects such as poles, pipes and shrubs from the ground with great ease, speed, and safety. Use of the device does not place the operator in direct contact with the object being extracted from the ground. The device is, thus, a cost-effective alternative to hand tools.
It is another object of the invention to provide a device of the type described that can be: set up, used, and taken down by a single person without resort to special tools or extensive training. In some instances of use, these steps can be performed in a few minutes.
It is a further object of the invention to provide a stump and pole extraction device whose height and width are adjustable to suit local terrain and space limitations. The device can also be folded flat for compact storage.
It is an object of the invention to provide improved elements and arrangements thereof in a stump and pole extraction device for the purposes described which is lightweight in construction, inexpensive to manufacture, and dependable in use.
Briefly, the stump and pole extraction device in accordance with this invention achieves the intended objects by featuring a pair of legs hingedly joined at their upper ends by a pivot pin suspending a winch above the ground. One of the legs has an interior cavity therein and an aperture located between its upper end and its lower end that provides access to the interior cavity. A pair of ground-engaging feet are secured, respectively, to the lower ends of the legs and extend laterally therefrom. One link of a chain is affixed within the interior cavity whereas another of the chain links is adapted for releasable attachment to the foot on the opposite leg. The chain is adapted for positioning within the interior cavity for convenient storage and for selective extension through the aperture for use.
The foregoing and other objects, features and advantages of the present invention will become readily apparent upon further review of the following detailed description of the preferred embodiment as illustrated in the accompanying drawings.
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patent: 6056273 (2000-05-01), Smith
Greiner Stephen R.
Matecki Katherine A.
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