Cutter for shaft and/or tunnel boring

Abstract

A cutter is provided for shaft and/or tunnel boring which comprises a divided cutter ring ( 10 a, 10 b ) and a cutter body ( 8 ) with a recess ( 17 ). The cutter ring ( 10 a, 10 b ) is secured in the recess ( 17 ) by a divided clamping ring ( 18 ). The clamping ring ( 18 ) is divided into at least two segments ( 18 a, 18 b ) where each segment ( 18 a, 18 b ) has two segment ends, with the result that when the clamping ring ( 18 ) is tightened, a number of pairs of opposite segment ends are formed. Furthermore, in a tightened condition, all the pairs of opposite segment ends are either connected to securing elements ( 20 ), or, in a tightened condition, at least one pair of opposite segments ends is connected with a hinged device ( 19 ) while the remaining pairs of opposite segment ends are connected to securing elements ( 20 ). The segments ( 18 a, 18 b ) are tightened in the segments' ( 18 a, 18 b ) circumferential direction.

1 . A cutter for shaft and/or tunnel boring, which cutter comprises a cutter body with a recess and at least one divided cutter ring which is secured in the recess by a clamping ring consisting of at least two segments,
 wherein the segments' ends, in a tightened condition, are tightened in pairs in the segments' circumferential direction by securing means provided at the end of the segments.   
     
     
         2 . A cutter according to  claim 1 ,
 wherein all the segments' ends are tightened in pairs by securing elements arranged built into the end of the segments.   
     
     
         3 . A cutter according to  claim 1 ,
 wherein between all opposite ends of the clamping ring's segments there is a gap for tightening.   
     
     
         4 . A cutter according to  claim 1 ,
 wherein the securing means comprise at least one hinged device for connecting one end of the segments.   
     
     
         5 . A cutter according to  claim 1 ,
 wherein the securing element can be moved in a first direction to abut against a shoulder in one clamping ring segment for tightening to the second segment and that the securing element can be moved in the opposite direction to abut against a back stop, with the result that the segments are pushed apart from each other.   
     
     
         6 . A cutter according to  claim 2 ,
 wherein the back stop is in the form of back stop elements arranged on each side of a centre axis for the securing element.   
     
     
         7 . A cutter according to  claim 1 ,
 wherein the securing means comprises a securing element in the form of a screw which is mounted built into one segment for interaction with a threaded section in the second segment for tightening of the two segments, and that the securing element is provided with edges or ring surfaces, or possibly a head, for interaction with the back stop in the first segment.   
     
     
         8 . A cutter according to  claim 1 ,
 wherein the cutter ring segments' adjacent angle to the cutter body is preferably greater than the adjacent angle to the clamping ring, and that the adjacent angle is greater than the angle of friction for the contact surfaces.   
     
     
         9 . A cutter according to  claim 1 ,
 wherein the cutter body is provided with one or more holes wherein a rod may be inserted, thereby enabling the cutter body to be rotated manually.   
     
     
         10 . A cutter according to  claim 1 ,
 wherein the cutter body has 2 cutter rings with segments, both of which are secured on the cutter body by a divided clamping ring between the cutter rings.