Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Adjustable head
Reexamination Certificate
1999-07-30
2001-06-12
Neuder, William (Department: 3673)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Adjustable head
C299S071000
Reexamination Certificate
active
06244664
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hewing or cutting roller of variable cutting width, in which two pivotable tool carriers for receiving cutting or hewing tools are arranged on at least one lateral end face of the roller transverse to the axis of the hewing or cutting roller.
2. Prior Art
AT 388 776 B has already shown a hewing or cutting roll, in which, for widening the cutting width, a tool carrier for receiving cutting or hewing tools, which is pivotable relative to the axis of the hewing or cutting roller, is arranged on at least one lateral end face of the roller. Such a known configuration has already been further developed to the extent that two tool carriers are each outwardly hinged to at least one side of the cutting roller. When extending such cutting roller widening means, all of the cutting forces and, in particular, the forces caused by the penetration into the rock must be taken over by the control cylinders. In the extended position, the cutting forces are acting in a manner that the hydraulic actuation cylinders will be outwardly stressed under tension, since the cutting forces become active outwardly in the sense of a pivotal movement of the pivotable tool carriers. In order to safely absorb such forces, double-acting hydraulic cylinder piston units and, in particular, very large dimensioned hydraulic cylinder piston units would have to be employed in the known structures.
SUMMARY OF THE INVENTION
The invention aims at providing a cutting roller widening means of the initially mentioned kind, with which small-structure hydraulic actutating drives will do and in which, furthermore, the stability of the selected position is substantially enhanced in the extended position. In the slanted position, or by pivoting, of the tool carrier, the cutting or hewing tools arranged on the tool carrier will assume adjacent positions, viewed in the axial direction, whereby parallel traces of cutting or hewing tools will be cut or broken in the mine face. The observance of a given pivoted position in that case is to ensure that the portion of cut or broken material will not change due to a displacement of the pivotable tool carriers in the extended position, whereby the wear of the pick is to be reduced at the same time. To solve this object, the configuration according to the invention essentially consists in that one of the tool carriers carries a locking pin which cooperates with a hook-shaped locking member of the other tool carrier in the extended position of the tool carriers. By means of such a locking pin cooperating with a hook-shaped locking member of the other tool carrier, a precisely defined extended position in which the tool carriers can be safely locked without provoking an excessive load on the actuation means for pivoting the tool carriers or a change in the pivoted position during operation may be ensured. As a result, the actuation cylinders are relieved and a rigid assembly is formed, with which the cutting traces are precisely followed even in the extended position of the tool carriers.
In a particularly advantageous manner, the configuration is devised such that the locking pin extends substantially parallel to the pivot axis of the tool carrier and that the hook-shaped locking member is constituted by a slot formed in the other tool carrier facing the locking pin. By means of such a configuration, a particularly high stability is achieved and, at the same time, the space required for the pivoting of the tool carriers is kept clear. Advantageously, the slot opening is arranged so as to be inclined in the direction towards the pivot axis of the tool carrier, whereby it is safeguarded that, in the pivoted-out position, the forces acting in the sense of widening are taken up by an accordingly steep flank of the slot, against which the locking pin is supported.
In order to ensure safe pivoting and a high degree of stability, the configuration advantageously is devised such that the tool carriers are connected to common pivoting by a coupling rod. In such a configuration, pivoting may be effected by means of but one hydraulic cylinder piston unit while simultaneously pivoting into the desired position both of the pivotable tool carriers. Advantageously, the configuration is devised such that the tool carriers are each connected with a hydraulic cylinder piston unit coupled to the hewing or cutting roller and outside the pivot axes of the tool carriers, wherein particularly small-structure hydraulic cylinder piston units will do as actuating cylinders.
REFERENCES:
patent: 334642 (1886-01-01), Clerc
patent: 2745650 (1956-05-01), Smith
patent: 3285667 (1966-11-01), Gonski
patent: 3730593 (1973-05-01), Karlovsky et al.
patent: 4172616 (1979-10-01), Delli-Gatti, Jr.
patent: 4177866 (1979-12-01), Mitchell
patent: 4875738 (1989-10-01), Zitz et al.
patent: 388 776 (1989-08-01), None
patent: 991569 (1965-05-01), None
Ebner Bernhard
Kogler Peter
Kreck John
Neuder William
Pillsbury & Winthrop LLP
Tamrock Voest-Alpine Bergtechnik Gesellschaft m.b.H.
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