Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent
1995-09-29
1997-09-02
Dang, Hoang C.
Boring or penetrating the earth
Boring without earth removal
Combined with earth removal
172 22, 173126, 175135, E21B 102
Patent
active
056621795
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for making holes in the ground, and then particularly for making holes in golf putting greens, wherein the device includes a tubular cutter having an open first end for insertion into the ground, and an opposite second end from which there extends a guide means along which there is movably guided a percussion weight which is intended to exert a hammering force on the upper end of the cutter when the device is in its use position.
2. Description of the Related Art
A device of the aforedescribed kind for making holes in putting greens is known from GB 2 031 484 for instance. The percussion weight, or hammer, has the form of a handgrip and is intended to be lifted by one hand of the user and then thrown down against the upper end of the cutter, so as to hammer the cutter into the ground. In the case of this known device, it is necessary for the user to hold the device in a position in which the desired hole can be obtained, normally a vertical hole, with his/her free hand. After having hammered the cutter down to the depth desired, in the case of golf to a depth of about 200 cm, and therewith filling the interior of the cutter with a corresponding core or plug of grass and soil, the device is twisted so as to loosen the plug from the surrounding earth. The hole making device and the plug are then lifted from the ground, whereafter the plug can be ejected with the aid of an ejector mechanism into an earlier used green hole and therewith refill the hole, while inserting a tubular liner into the newly made hole and therewith complete the hole making operation.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a novel and advantageous device for making holes in the ground, and then particularly in putting greens, which includes a percussion weight and with which it is possible to maneuver the percussion weight with both hands while being able to hold the device in a desired position relative to the ground.
In accordance with the invention there is proposed to this end a device of the kind defined in the introduction wherein a tubular part provided with a handgrip for maneuvering the percussion weight is connected to the end of the percussion weight that lies distal from the tubular cutter, said tubular part being mounted for axial movement along the guide means, wherein on one hand the cutter and associated guide means and on the other hand the percussion weight or hammer with associated tubular part that includes the handgrip can be locked releasably against axial relative movement and are non-rotational in relation to one another, or are releasably locked together also against rotational movement.
The percussion weight of this device can be maneuvered comfortably in an ergonomically satisfactory manner via the handgrip located on the movably mounted tubular part. This latter part can be locked in relation to its guide means, so as to enable the cutter to be twisted loose from the ground while filled with grass and soil plug, and to enable the plug to be lifted from the ground together with the cutter.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference two exemplifying embodiments of the invention and with reference to the accompanying drawings, in which
FIG. 1 is a schematic vertical axial section view of a first exemplifying embodiment of an inventive device;
FIG. 2 is a vertical axial section view of a second exemplifying embodiment of the inventive device; and
FIG. 3 is essentially a side view of the device shown in FIG. 2, taken from the right in FIG. 2.
Corresponding or essentially corresponding components illustrated in the different figures of the drawing have been identified with the same reference signs.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The device for making holes in the ground, particularly in golf greens, illustrated in FIG. 1 comprises a cylindrical cutter 1 which includes a bottom cutting edge 2 and an upp
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Dang Hoang C.
Hudiksvalls Teknik Centrum AB
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