Tool driving or impacting – With vehicle support for drive
Patent
1993-10-15
1995-07-11
Smith, Scott A.
Tool driving or impacting
With vehicle support for drive
173152, E21B 720
Patent
active
054312345
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a ground-drilling device comprising a main carriage displaceable on a mount.
In-case of ground-drilling devices, the rotatingly driven drill column is advanced toward the drill hole with a pressure force being generated during drilling. The drilling unit rotating the drill rod is arranged on a carriage displaceable along the track of a mount. Mostly, the mount is arranged on a vehicle and it can be pivoted about a horizontal axis in order to drill drill holes with different angles of inclination. Normally, the advancing force for the carriage is raised by a hydraulic motor driving a chain hoist which advances the carriage with a desired pressure force so that the drill rod is firmly pressed against the base of the drill hole. A chain drive, however, has the disadvantage that it requires a long stable chain having at least about twice the length of the mount. Such chain drives are susceptible to soiling and chain rupture. In particular, when concrete is to be introduced into the drill hole, there is the risk that the chain links are loaded with concrete. In addition, bulky reducing gears are typically required. Another disadvantage of the known chain drives for the advancement of the main carriage consists in that a chain drive operates jerky in the pitch of the chain links so that a sensitive smooth jerkless advancement is not possible. To withdraw the drill column out of the drill hole, a rapid drive is typically required which also requires the use of a bulky transmission (DE 29 24 393 C2).
The use of piston-cylinder units for the direct advancement of the main carriage on the mount has so far failed due to the fact that such a piston-cylinder unit has to project rearwardly far beyond the mount since the displacement track normally extends essentially over the entire length of the mount. Owing to a far-projecting piston-cylinder unit, the length of the ground-drilling device is substantially increased beyond the length of the mount.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a ground-drilling device which has a simplified drive device for advancing the main carriage and which does not require a transmission device, such as a chain drive, the length of the ground-drilling device, however, not being substantially increased.
In the case of the ground-drilling device according to the invention, the drive device for the main carriage consists of a linearly operating piston-cylinder unit extending below the track of the guide mount underneath the main carriage. Since the piston-cylinder unit overlaps with the main carriage, an essential part of the piston-cylinder unit is arranged in the area of the length of the mount so that only a relatively small part projects beyond the length of the mount, if such projection is present at all. Preferably, one single piston-cylinder unit is provided which is arranged in the space encompassed by the mount and which is laterally encompassed by the mount. However, it is possible to provide two such piston-cylinder units in parallel at the side of the mount.
The cylinder of the piston-cylinder unit may be arranged in a stationary manner on the mount, the piston being the movable member which engages the main carriage. This arrangement, however, may also be reversed such that the piston is supported on the mount and the cylinder engages the main carriage and is movable relative to the mount.
In the retracted state, the piston-cylinder unit is preferably located in the rearward half of the mount, the movable part of the piston-cylinder unit engaging the fore end of the main carriage. Alternatively, it is possible to arrange the piston-cylinder unit at the fore half of the length of the guide mount, the movable member of the piston-cylinder unit then engaging the rearward end of the main carriage. The forward end is the one facing the drill hole, which means the end being in front during the drill feed.
The invention permits a drill feed with high force and high efficiency because the force of th
REFERENCES:
patent: 3126063 (1964-03-01), Pitt et al.
patent: 3850253 (1974-11-01), Lupton et al.
patent: 3915241 (1975-10-01), Bieri
patent: 4553612 (1985-11-01), Durham
Ing. G. Klemm
Smith Scott A.
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