Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Patent
1998-03-31
2000-08-22
Lillis, Eileen Dunn
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
404 90, 180209, 299 394, E01C 23088
Patent
active
061060739
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a road construction machine for the treatment of roadways, e.g. roadway surfaces of concrete, asphalt or the like.
Such road construction machines are used, for example, as cold milling cutters for completing a roadway surface.
From DE 23 44 877 C3, a device for milling off roadway surfaces is known, wherein pivotable support wheels are fixed to a height-adjustable milling roller. The support wheel is pivoted about a vertical axis. The support wheel itself is also height-adjustable.
The pivoting position of the support wheel can be locked by means of bolts. These support wheels serve to keep constant the depth of milling of the milling roller. They are not driven and do not carry the machine weight, which is supported by the wheel frame.
In milling cutters of a more recent construction, an all-wheel drive is provided so that the support wheels usually arranged in the height of the milling roller are also driven. The support wheels are telescopic by means of hydraulic cylinders and carry the machine weight. The milling roller is arranged on the rear end of the machine frame and reaches, with its first frontal surface, close to the so-called zero extension side where the frontal surface of the milling roller is almost flush with the lateral edge of the machine frame. The milling roller thus is roughly flush and parallel to the rear side of the machine frame.
Because of the direct adjustability of the depth of milling, the support wheels are located on the height of the roller axis of the milling roller. In the case of a milling process occurring flush with the edges, the support wheel located on the zero extension side, which projects laterally beyond the zero extension side in a normal first end position, can be pivoted relatively to the machine frame to the inside so that work can take place near the edge. Pivoting the support wheel occurs about a vertical pivoting axis with the support wheel being attached to the machine frame in two places at a large vertical distance to obtain a sufficient stability to support the weight of the machine. The uniaxial mounting of the pivoting means projects relatively to the zero extension side so that it is possible to work near an edge but not to go as far as to be flush with the wall of a house.
The driver's platform is arranged on the machine frame above the milling roller. In the case of milling near edges on the zero extension side, the support wheel and the uniaxial mounting of the support wheel obstruct a free view on the working space in front of the milling roller both in the extended and especially in the retracted state. As the pivoting means requires a large amount of space, it is not possible to set a driver's cabin on the driver's platform. Furthermore, the operator has to mount and dismount at the back, which is disadvantageous for safety reasons. Another disadvantage is the fact that the rotational direction of the support wheel is changed by its being pivoted. Therefore, it is necessary to switch the rotational direction of the hydraulic drive for the support wheel, or the support wheel has to be mounted rotationally on the lifting column requiring an additional locking device.
The invention is based on the object to improve a road construction machine of the above kind such that, in the case of a support wheel pivotable on the zero extension side of the machine, the free view on the working space in front of the working means can be improved in the case of work near an edge.
The features of the invention serve to achieve this object.
Advantageously, the invention provides that the pivotable support wheel is pivotable by means of a gear arranged in a horizontal plane from a first exterior end position to the interior end position. By means of the horizontal position of the gear, the vertical space required for the pivoting means of the support wheel is reduced substantially, so that the support wheel with the pivoting means allows for a better view on the working space in front of the working means both in the extended and in the
REFERENCES:
patent: 3188026 (1965-06-01), Perdue et al.
patent: 3306390 (1967-02-01), Jamme
patent: 3971594 (1976-07-01), Wirtgen
patent: 4966418 (1990-10-01), Wirtgen
Hahn Gunter
Simons Dieter
Kreck John
Lillis Eileen Dunn
Wirtgen GmbH
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