Cutting element with a base element and chisel holder

Details Cutting element with a base element and chisel holder Cutting element with a base element and chisel holder

1996-07-08

1997-11-04

Bagnell, David J.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Clamped tooth holder or tooth mount

299106, E21C 35193

Patent

active

056831447

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a cutting tool which can be fastened on a cylinder-shaped cutting element of a cutting machine. The cutting tool has a base element and a chisel holder. The chisel holder is provided with a plug connector which is maintained in a plug receiver of the base element. The chisel holder has a stop face which rests flat against a stop of the base element.
2. Description of Prior Art
Such a cutting element is known from German Reference DE 92 11 739. A plug connector of the chisel holder is inserted into the plug receiver of the base element. The plug receiver is inclined forward in the direction of running of the cutting element, so that the plug connector is inserted into the base element. A shoulder, disposed behind the plug connector viewed in the direction of running of the cutting element and extending perpendicularly with the axis of the chisel receiver, is used to support a support face of the chisel holder. An edge is formed between the shoulder and the plug receiver, which exerts high edge pressure on the transition area between the plug connector and the support face of the chisel holder during the cutting process. Pulsating stresses occurring in cutting machines lead to alternating loads which quickly result in material fatigue of the chisel holder in the area of the edge, so that the plug connector breaks off and the chisel holder separates from the base element.
Thus, the service life of such a cutting machine is greatly limited, and relatively high costs arise because of necessary repairs and idle periods.
A chisel holder is described in Australian Reference AU-A-3 359 071 on which a chisel can be fixed in place. The chisel holder has a plug receiver. A plug connector of the chisel can be inserted into the plug receiver. A stop follows the plug receiver at an angle, forming an edge. The stop is disposed behind the plug receiver, viewed in the direction of running. A counter surface, corresponding to the stop, is disposed on the plug connector of the chisel. The counter surface is also disposed at an angle to the plug connector, forming an edge. In the inserted state of the chisel in the chisel holder, the edges of the plug receiver and the plug connector rest against each other.
Shock-like loads act on the chisel during operation. Because of the high stresses which typically occur in the area of the touching edges of the chisel holder taught by the '071 reference, such shock-like loads result in material fatigue. Thus premature wear of the chisel or the chisel holder occurs. The downtime of the chisel holder and the necessary replacement connected therewith are expensive, since the old chisel holder which is welded on a cutting roller must first be removed, and then a new chisel holder must be welded on the cutting roller in place of the old chisel holder.


SUMMARY OF THE INVENTION

It is one object of this invention to provide a cutting element for a cutting machine of the type mentioned at the outset wherein the chisel holder can be supported and held in the base element without danger of the plug connector breaking.
According to one preferred embodiment of this invention, the base element has a shoulder arranged around the plug receiver and is positioned at a distance from the chisel holder. The shoulder together with the stop form an obtuse-angled receiver for the chisel holder.
The chisel holder is thus supported flat on the stop. Depending on the direction of introduction of the force, the stop is inclined with respect to the shoulder so that stress on the base element is reduced. Because the chisel holder is spaced apart from the shoulder in the area around the plug receiver, the force upon the chisel is absorbed by the shoulder. The plug connector is kept free of stress.
Thus, damage to the plug receiver of the base element is impossible, and the useful service life of such a cutting tool is considerably increased.
According to one preferred embodiment of the cutting element of this invention the obtuse angle

REFERENCES:
patent: 3992061 (1976-11-01), Rollins
patent: 4343516 (1982-08-01), Aden
patent: 4915455 (1990-04-01), O'Neill et al.

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