Tool, cutter and button disk

Abstract

A tool for mining rock by means of undercutting includes an attachment part which defines a center longitudinal axis, and a holder mounted to the attachment part by bearings for rotation relative thereto about the axis. An outer surface of the holder includes a circumferentially extending first groove. A button disk is mounted on the cutter and includes an inner surface having a circumferentially extending second groove. One of the grooves is superimposed relative to the other groove to define therewith a space. A wire extends within the space to hold the button disk on the cutter.

1 . A tool for mining rock, comprising: 
 an attachment part defining a center longitudinal axis,    a holder mounted to a front portion of the attachment part by bearings for rotation relative thereto about the axis, an outer surface of the holder including a circumferentially extending first groove,    a button disc mounted on the holder and including an inner surface having a circumferentially extending second groove, wherein one of the grooves is superimposed relative to the other groove to define therewith a space; and    a wire extending within the space to hold the button disc on the cutter.    
   
   
       2 . The tool according to  claim 1  wherein the button disc includes hard metal buttons arranged in an annular row along an outer periphery of the button disc, a center line of each button disc intersecting the axis at a point located axially rearwardly of the wire.  
   
   
       3 . The tool according to  claim 1  wherein the button disc includes an internal surface overlying an external surface of the holder, the button disc including a rearwardly facing abutment surface abutting a forwardly facing abutment surface of the holder, each groove spaced by an axial distance from the abutment surfaces, the distance being shorter than 50% of an axial extension of the internal surface.  
   
   
       4 . The tool according to  claim 3  wherein the distance is shorter than 40% of the axial extension.  
   
   
       5 . The tool according to  claim 1 , wherein the wire has a length substantially corresponding to a length of the space.  
   
   
       6 . A cutter for mining rock material, the cutter defining an axis of rotation and comprising a holder, a button disk mounted to a front portion of the holder, and a wire oriented in a space defined by mutually superimposed circumferential grooves of the holder and the button disc, for securing the button disk to the holder.  
   
   
       7 . The cutter according to  claim 6 , further including hard metal buttons arranged in a generally annular row along an outer periphery of the button disc; each button defining a center line which intersects the axis at a point located axially rearwardly of the wire, the button disc including an internal surface in which one of the grooves is formed.  
   
   
       8 . The cutter according to  claim 7  wherein the button disc includes a rearwardly facing abutment surface for abutting the holder, the groove of the button disc spaced forwardly from the abutment surface by a distance shorter than 50% of the axial length of the internal surface.  
   
   
       9 . The cutter according to  claim 8  wherein the distance is shorter than 40% of the axial length.  
   
   
       10 . The cutter according to  claim 6  wherein the button disc includes a central cylindrical hole defined by the internal surface.  
   
   
       11 . A button disc adapted to be rotatably journaled on a holder and defining an axis of rotation; the button disc carrying rock breaking elements at a front portion thereof and including a circumferential groove adapted to receive a wire for attaching the button disc to the holder.  
   
   
       12 . The button disc according to  claim 11  wherein the button disc includes an internal surface in which the groove is formed.  
   
   
       13 . The button disc according to  claim 12  wherein the internal surface defines a central cylindrical hole passing through the button disc.  
   
   
       14 . The button disc according to  claim 13  further including a rearwardly facing abutment surface; the groove spaced forwardly from the abutment surface by a distance shorter than 50% of an axial length of the hole.  
   
   
       15 . The button disc according to  claim 14  wherein the distance is shorter than 40% of the axial length.