Tool holder, and chisel support and drilling bit for a drill head

Abstract

A drill head including a tool holder, chisel supports mounted thereon and drill bits. According to this invention, the chisel supports can be separated from the tool holder.

1 . A tool holder ( 10 ) for a drill head with a fastening shank ( 11 ) having at least one mud channel ( 15 ) passing through or associated with the at least one mud channel ( 15 ) and having a support structure ( 12 ) fastened directly or indirectly to the fastening shank ( 11 ), the tool holder ( 10 ) comprising the support structure ( 12 ) having tool sockets ( 13 ) offset from one another in a circumference direction. 
     
     
         2 . The tool holder ( 10 ) according to  claim 1 , wherein the tool sockets ( 13 ) are formed as insertion sockets. 
     
     
         3 . The tool holder ( 10 ) according to  claim 2 , wherein the tool sockets ( 13 ) have an insertion opening which opens in a direction oriented away from the fastening shank ( 11 ) or in a radially outward direction and/or the tool socket ( 13 ) has a protruding guide region ( 13 . 1 ) with guide surfaces. 
     
     
         4 . The tool holder ( 10 ) according to  claim 3 , wherein near the tool socket ( 13 ) a fastening receptacle ( 12 . 1 ) being a screw receptacle positioned which opens in a direction toward the fastening shank ( 11 ) and being accessible from the opening. 
     
     
         5 . The tool holder ( 10 ) according to  claim 4 , wherein the tool sockets ( 13 ) have guide grooves ( 13 . 2 ) on opposite sides from each other. 
     
     
         6 . The tool holder ( 10 ) according to  claim 5 , wherein the guide grooves ( 13 . 2 ) are each delimited by two flanks ( 13 . 3 ) which extend in a longitudinal direction of the groove. 
     
     
         7 . The tool holder ( 10 ) according to  claim 6 , wherein the tool sockets ( 13 ) each at least partially comprises two guide projections ( 13 . 1 ), and outlet channels ( 14 . 1 ) are formed between the guide projections ( 13 . 1 ) of the adjacent tool sockets ( 13 ). 
     
     
         8 . A drill bit support ( 20 ) for a drill head with a support head ( 26 ), on which a drill bit ( 30 ) can be fastened to a bearing section ( 26 . 3 ) in a rotary fashion, comprising an insertion lug ( 21 ) directly or indirectly coupled to the support head ( 26 ). 
     
     
         9 . The drill bit support ( 20 ) according to  claim 8 , wherein the insertion lug ( 21 ) has guide pieces ( 22 ) on two opposite sides. 
     
     
         10 . The drill bit support ( 20 ) according to  claim 9 , wherein the guide pieces ( 22 ) have two guide surfaces ( 22 . 1 ), and flanks ( 13 . 3 ) oriented at an angle relative to each other and connected to each other by a connecting section ( 22 . 2 ). 
     
     
         11 . The drill bit support ( 20 ) according to  claim 10 , wherein the insertion lug ( 21 ) has a support lug ( 23 ) at a free end. 
     
     
         12 . The drill bit support ( 20 ) according to  claim 11 , wherein the support lug ( 23 ) transitions into the guide pieces ( 22 ). 
     
     
         13 . The drill bit support ( 20 ) according to  claim 12 , wherein the insertion lug ( 21 ) is delimited by a flat inner surface ( 24 ) and/or by a convex outer surface ( 25 ). 
     
     
         14 . The drill bit support ( 20 ) according to  claim 13 , wherein the support head ( 26 ) supports a bearing section ( 26 . 3 ) and labyrinth seal parts are positioned in a transition region from the support head ( 26 ) to the bearing section ( 26 . 3 ). 
     
     
         15 . The drill bit support ( 20 ) according to  claim 14 , wherein the bearing section ( 26 . 3 ) has a circumferential groove ( 26 . 5 ) for accommodating a clamping element ( 29 . 1 ). 
     
     
         16 . The drill bit support ( 20 ) according to  claim 15 , wherein a central longitudinal axis (ML) formed by the bearing section ( 26 . 3 ) is oriented at an angle (a) in a range between 70° and 90° relative to the outer surface ( 25 ). 
     
     
         17 . The drill bit support ( 20 ) according to  claim 16 , wherein the guide pieces ( 22 ) on the insertion lug ( 21 ) are asymmetrical relative to the central longitudinal plane (L) extending in the longitudinal direction of the insertion lug. 
     
     
         18 . A drill bit ( 30 ) for a rotatable coupling to a drill bit support ( 20 ), having an outer surface ( 31 ) with hard material elements ( 34 ) and a bearing receptacle ( 37 ), the drill bit ( 30 ) comprising: near the bearing receptacle ( 37 ), a circumferential groove ( 38 ) accommodating a clamping element ( 29 . 1 ) adjustable between two clamping positions. 
     
     
         19 . The drill bit ( 30 ) according to  claim 18 , wherein the labyrinth seal parts are positioned near the bearing receptacle ( 37 ). 
     
     
         20 . The drill bit ( 30 ) according to  claim 19 , wherein the bearing receptacle ( 37 ) has an end surface that supports a support element ( 39 ) of a hard material. 
     
     
         21 . The drill bit ( 30 ) according to  claim 18  for mounting on a tool support ( 20 ) according to  claim 8 . 
     
     
         22 . The tool holder ( 10 ) according to  claim 1 , wherein near the tool socket ( 13 ) a fastening receptacle ( 12 . 1 ) being a screw receptacle positioned which opens in a direction toward the fastening shank ( 11 ) and being accessible from the opening. 
     
     
         23 . The tool holder ( 10 ) according to  claim 1 , wherein the tool sockets ( 13 ) have guide grooves ( 13 . 2 ) on opposite sides from each other. 
     
     
         24 . The tool holder ( 10 ) according to  claim 1 , wherein the tool sockets ( 13 ) each at least partially comprises two guide projections ( 13 . 1 ), and outlet channels ( 14 . 1 ) are formed between the guide projections ( 13 . 1 ) of the adjacent tool sockets ( 13 ). 
     
     
         25 . The drill bit support ( 20 ) according to  claim 8 , wherein the insertion lug ( 21 ) has a support lug ( 23 ) at a free end. 
     
     
         26 . The drill bit support ( 20 ) according to  claim 8 , wherein the insertion lug ( 21 ) is delimited by a flat inner surface ( 24 ) and/or by a convex outer surface ( 25 ). 
     
     
         27 . The drill bit support ( 20 ) according to  claim 8 , wherein the support head ( 26 ) supports a bearing section ( 26 . 3 ) and labyrinth seal parts are positioned in a transition region from the support head ( 26 ) to the bearing section ( 26 . 3 ). 
     
     
         28 . The drill bit support ( 20 ) according to  claim 8 , wherein the bearing section ( 26 . 3 ) has a circumferential groove ( 26 . 5 ) for accommodating a clamping element ( 29 . 1 ). 
     
     
         29 . The drill bit support ( 20 ) according to  claim 13 , wherein a central longitudinal axis (ML) formed by the bearing section ( 26 . 3 ) is oriented at an angle (a) in a range between 70° and 90° relative to the outer surface ( 25 ). 
     
     
         30 . The drill bit support ( 20 ) according to  claim 8 , wherein the guide pieces ( 22 ) on the insertion lug ( 21 ) are asymmetrical relative to the central longitudinal plane (L) extending in the longitudinal direction of the insertion lug. 
     
     
         31 . The drill bit ( 30 ) according to  claim 18 , wherein the bearing receptacle ( 37 ) has an end surface that supports a support element ( 39 ) of a hard material.