Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1995-10-19
1998-06-30
Smith, Scott A.
Tool driving or impacting
Impacting devices
With means for rotating tool
173216, B23B 4502
Patent
active
057719829
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a rock drill and more particularly to the mounting of a rotation module to the body of a rock drill.
Rocks drills known to the applicant consist of various sections which are bolted together. These sections normally include at least a drill rod flushing section, a rotation gear housing section and a percussion section. The drill, assembled from the aforementioned parts, is bolted to a drill cradle Which slides on a drill feed during drilling.
This kind of arrangement simplifies the construction and lowers the cost of manufacture. On the other hand the rock drill is more vulnerable to damage and its life expectancy is reduced.
In percussive drilling a heavy drill piston hammers the drill steel via a drill shank at a frequency of from 40 to 60 Hz. The resulting vibrations can cause the connecting bolts to become loose and this in turn, without maintenance and tightening up, will result in heavy maintenance expenses or, at worse, ruin the drill.
Loose bolts also cause wear on opposing surfaces between adjacent sections. The worn surfaces or the loose sections cause the percussion section to move out of alignment with the drill shank. The impact surface between the piston and the shank may then be angled and this can cause the shank or the piston to break. If the piston breaks, the percussion mechanism, which is expensive, is invariable destroyed and the hydraulic oil is contaminated.
The applicants are aware of an arrangement for mounting a rotation element in a drilling machine, described in the specification of U.S. Pat. No. 4,842,080, wherein the rotation element has stepped bearing surfaces which permit the rotation element to be mounted to a body in a simplified manner. The rotation element may be detached from the body by removal of a single end cover. With this arrangement rotation machinery is mounted on an outer surface of the body and imparts a rotational drive via a gear ring to the rotation element. The advantage of having a separate rotation module is lost.
Similarly, in the specification of South African patent No. 87/2885 (counterpart to Finnish application No. 861938) there is disclosed a rotation bushing mounted directly inside the body of a drill. Again the advantage of a separate rotation module is lost.
SUMMARY OF THE INVENTION
The invention is concerned with a rock drill of relatively simplified construction which embodies important manufacturing and maintenance aspects.
The invention provides a percussive rock drill which includes a main body with a chamber which is formed in the main body, a rotation module which includes a gear housing which is mounted in the chamber, gear means in the gear housing, a drill shank which is engaged with the gear means and which is rotatable and reciprocable relatively to the gear housing, and a percussion module which is located in the main body, the rotation module being positioned at one end of the percussion module.
The gear housing may include a flange which is secured directly to one end of the body. Alternatively the flange may be dispensed with.
A flushing module may be located on an outer side of the rotation module and may be secured directly to the main body or indirectly, via the flange of the gear housing.
The rotation module may be engageable with drive means extending from at least one rotation motor which is mounted at a second end of the body which is remote from the end to which the aforementioned flange is secured.
Alternatively at least one rotation motor is mounted directly to the rotation module, for example to the flange of the gear housing.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a view in perspective of a rock drill according to one form of the invention with modules of the rock drill shown in an exploded configuration,
FIG. 2 is a perspective view illustrating the rock drill of FIG. 1 fully assembled,
FIG. 3 is a rear side view, partly, sectioned of the assembl
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Briggs Roger Robarts
Leppanen Jarmo Uolevi
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