Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Patent
1998-10-20
2000-06-20
Bagnell, David
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
299 361, E01C 2309
Patent
active
060768959
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a road cutting machine for cutting a road such as road-way, bridge-road, foot-way or the like on which asphalt pavement or cement concrete pavement is effected to thereby provide a flat road surface.
BACKGROUND ART
When a road has been used for a long time, a road surface may be damaged as a rutted road having irregular surface or cracked, so that it becomes necessary to cut such road so as to provide a flat surface or carry out repairing working by cutting and removing the pavement and then perform re-pavement.
There is known, as a machine for cutting the road surface, a road cutter having a vehicle body to which a drum-type road cutting apparatus is mounted to be moved in an elevating manner and the road is cut by the cutting apparatus while travelling the vehicle body.
Furthermore, as shown in a publication of the Japanese Utility Model Registration No. 3021022, there is also known a road cutter in which a cutting apparatus, having a member (cutting member) rotated by a motor, to which a plurality of claws are formed, is mounted to a front end portion of an arm of a power shovel and the road is cut by the claws by bilaterally swinging them.
However, the road cutting machine called as road cutter as mentioned above is a machine cutting the road while traveling thereon and the road cutting apparatus thereof has a cutting bit which is mounted to the drum rotatable about a horizontal axis, so that it is impossible for such cutter to cut a peripheral portion of a manhole and a portion near a road shoulder.
Because of this reason, in the known art, the peripheral road portion of the manhole and the road portion near the shoulder, which are not cut in the conventional machine, have been cut through a chipping working of workers by means of compressor or breaker, which involves much troublesome working and much time, thus providing a bad workability, and moreover, there is caused a problem of generating noises of the compressor and the breaker in the chipping working, which causes a problem of noise pollution.
Furthermore, in the prior art using the power shovel, since the road is cut while pressing the claws of the cutting member against the road surface and bilaterally swinging the arm in a manner like sweeping the road surface, the peripheral road portion of the manhole and the road portion near the shoulder can be cut. However, in this manner, when the deep road cutting work is performed by swinging the arm downward and pressing the cutting member against the road surface, it is difficult to prevent the cutting member from being swung horizontally and vertically by a cutting reaction force applied to the cutting member during the cutting working, so that the deep cutting work with high efficiency could not be expected.
The present invention therefore provides a road cutting machine capable of solving the above mentioned problems.
DISCLOSURE OF THE INVENTION
The first embodiment of the road cutting machine according to the present invention comprises a machine body mounted to a traveling body to be swivel, a boom mounted to the machine body to be swingable in a vertical direction, an arm mounted to the boom to be swingable in a vertical direction and a road cutting apparatus mounted to the arm, a hydraulic motor mounted to the mounting member and a cutting bit mounting member rotated by the hydraulic motor and provided with a plurality of cutting bits, and mounted to a center of rotation, a plurality of flat surface cutting bits attached in a range from the rotation center side to an outer periphery side, a plurality of sweep-cutting bits attached on the outer periphery side and a plurality of side surface cutting bits attached on the outer periphery side, lowermost position, bit tip end portions of the sweep-cutting bits are positioned above the bit tip end portion of the main cutting bit, bit tip end portions of the flat surface cutting bits are positioned above the tip end portions of the sweeping cutting bits, and bit tip end portio
REFERENCES:
patent: 4968101 (1990-11-01), Bossow
patent: 5470131 (1995-11-01), Nolan et al.
Horie Yoshiyuki
Ino Syoji
Bagnell David
ITO Co., Ltd.
Singh Sunil
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