Tool holder

Abstract

A tool holder including a tool box with a tool seat in a holding projection for receiving a tool in such a manner that it can be replaced. The tool seat is configured as a bore and has a tool insertion opening. The tool holder has a fastening side with a fastening projection and, facing away from said fastening side, an exterior, and during use of the tool centrifugal forces are effective in the direction from the fastening side to the exterior. This invention ensures the free rotatability of a tool inserted in the tool holder even if overburden material enters the tool seat. For this purpose, the holding projection has an opening penetrating the inner wall of the tool seat and creating a spatial connection to the exterior, and the opening opens the tool seat towards the exterior.

The invention claimed is: 
     
       1. A tool holder arrangement with a chisel holder ( 10 ) having a chisel receiver ( 20 ) in a holding neck ( 15 ) for receiving a chisel ( 30 ) which is exchangeably received within the chisel receiver ( 20 ) embodied in a shape of a bore and having a chisel insertion opening ( 24 ), wherein the chisel holder ( 10 ) has a fastening side with a fastening neck ( 11 ) and facing away from the fastening side has an exterior, and wherein during a tool operation centrifugal forces act in a direction from the fastening side to the exterior, the tool holder arrangement comprising:
 the holding neck ( 15 ) having an opening ( 22 ) penetrating an interior cylindrical wall of the chisel receiver ( 20 ) and creating a spatial connection with surroundings, and 
 the opening ( 22 ) opening the chisel receiver ( 20 ) toward the exterior; 
 wherein the chisel receiver ( 20 ) is a through-bore and has an expulsion opening ( 21 ) facing away from the chisel insertion opening ( 24 ), and the opening ( 22 ) opens the chisel receiver ( 20 ) near the expulsion opening ( 21 ) and extends, starting at the expulsion opening ( 21 ), in a second direction of the chisel insertion opening ( 24 ). 
 
     
     
       2. The tool holder arrangement in accordance with  claim 1 , wherein a chisel shaft ( 31 ) of the chisel ( 30 ) is inserted into the chisel receiver ( 20 ), and the opening ( 22 ) is arranged at least in an area of the chisel receiver ( 20 ) assigned to a shaft end. 
     
     
       3. The tool holder arrangement in accordance with  claim 2 , wherein the opening ( 22 ) is a slit-shaped cutout having two delimitation faces ( 23 ) extending parallel with respect to each other along a longitudinal axis of the chisel receiver ( 20 ), and the delimitation faces ( 23 ) are one of at a distance from each other which is less than or equal to a bore diameter of the chisel receiver ( 20 ), and extending at an angle with respect to each other at an angle of less than 180°. 
     
     
       4. The tool holder arrangement in accordance with  claim 3  wherein the opening ( 22 ) occupies a portion of the interior wall of the chisel receiver extending over less than 180° of a circumference of the bore-shaped chisel receiver ( 20 ). 
     
     
       5. The tool holder arrangement in accordance with  claim 4 , wherein the chisel holder ( 10 ) is fastened on a base element ( 40 ), the base element ( 40 ) has a cutout ( 44 ) which provides access for a disassembly tool to the expulsion opening ( 21 ) of the chisel receiver ( 20 ), and the cutout ( 44 ) makes a transition into the opening ( 22 ). 
     
     
       6. The tool holder arrangement in accordance with  claim 5 , wherein at least one liquid spray device is assigned to the chisel holder ( 10 ) and introduces liquid into the chisel receiver ( 20 ) through the opening ( 22 ). 
     
     
       7. The tool holder arrangement in accordance with  claim 6 , wherein the liquid spray device applies a jet of liquid to a free end of the chisel shaft ( 31 ). 
     
     
       8. The tool holder arrangement in accordance with  claim 1 , wherein a chisel shaft ( 31 ) of the chisel ( 30 ) is inserted into the chisel receiver ( 20 ), and the opening ( 22 ) is arranged at least in an area of the chisel receiver ( 20 ) assigned to a shaft end. 
     
     
       9. The tool holder arrangement in accordance with  claim 1 , wherein the opening ( 22 ) is a slit-shaped cutout having two delimitation faces ( 23 ) extending parallel with respect to each other along a longitudinal axis of the chisel receiver ( 20 ), and the delimitation faces ( 23 ) are one of at a distance from each other which is less than or equal to a bore diameter of the chisel receiver ( 20 ), and extending at an angle with respect to each other at an angle of less than 180°. 
     
     
       10. The tool holder arrangement in accordance with  claim 1 , wherein the opening ( 22 ) occupies a portion of the interior wall of the chisel receiver extending over less than 180° of a circumference of the bore-shaped chisel receiver ( 20 ). 
     
     
       11. The tool holder arrangement in accordance with  claim 1 , wherein the chisel holder ( 10 ) is fastened on a base element ( 40 ), the base element ( 40 ) has a cutout ( 44 ) which provides access for a disassembly tool to the expulsion opening ( 21 ) of the chisel receiver ( 20 ), and the cutout ( 44 ) makes a transition into the opening ( 22 ). 
     
     
       12. The tool holder arrangement in accordance with  claim 1 , wherein at least one liquid spray device is assigned to the chisel holder ( 10 ) and introduces liquid into the chisel receiver ( 20 ) through the opening ( 22 ). 
     
     
       13. The tool holder arrangement in accordance with  claim 12 , wherein the liquid spray device applies a jet of liquid to a free end of the chisel shaft ( 31 ). 
     
     
       14. A tool holder arrangement, comprising:
 a chisel holder having a chisel receiver in a holding neck for receiving a chisel which is exchangeably received within the chisel receiver through an insertion opening, wherein the chisel holder has a fastening side with a fastening neck and facing away from the fastening side has an exterior, and wherein during a tool operation centrifugal forces act in a direction from the fastening side to the exterior; 
 the chisel receiver being a cylindrical through-bore and having an expulsion opening at an end of the holding neck that faces away from the chisel insertion opening; and 
 an opening in the holding neck, the opening penetrating an interior cylindrical wall of the chisel receiver and creating a spatial connection between the chisel receiver and the surroundings to open the chisel receiver toward the exterior, the opening intersecting with the expulsion opening and extending from the expulsion opening toward the chisel insertion opening. 
 
     
     
       15. The tool holder arrangement in accordance with  claim 14 , wherein the opening extends from the expulsion opening toward the chisel insertion opening a distance that places a portion of a chisel shaft of the chisel inserted into the chisel receiver beneath the opening. 
     
     
       16. A tool holder arrangement with a chisel holder having a chisel receiver in a holding neck for receiving a chisel which is exchangeably received within the chisel receiver embodied in a shape of a bore and having a chisel insertion opening, wherein the chisel holder has a fastening side with a fastening neck and facing away from the fastening side has an exterior, and wherein during a tool operation centrifugal forces act in a direction from the fastening side to the exterior, the tool holder arrangement comprising:
 the holding neck having an exterior opening penetrating an interior wall of the chisel receiver and creating a spatial connection with surroundings, and   the exterior opening opening the chisel receiver toward the exterior;   wherein at least one liquid spray device is assigned to the chisel holder and introduces liquid into the chisel receiver through the exterior opening.    
     
     
       17. The tool holder arrangement in accordance with claim 16, wherein the liquid spray device applies a jet of liquid to a free end of the chisel shaft.  
     
     
       18. A method of operating a tool holder arrangement, the method comprising:
 (a) providing a tool holder arrangement, including:
 a chisel holder having a chisel receiver in a holding neck, wherein the chisel holder has a fastening side with a fastening neck and facing away from the fastening side has an exterior, and wherein during a tool operation centrifugal forces act in a direction from the fastening side to the exterior; 
 the chisel receiver being a cylindrical through-bore and having an insertion opening for receiving a chisel, and an expulsion opening at an end of the chisel receiver that faces away from the chisel insertion opening; 
 a chisel received within the chisel receiver through the insertion opening, the chisel having a chisel head and a chisel shaft, the chisel shaft having a free end; and 
 an exterior opening in the holding neck, the exterior opening extending toward the chisel insertion opening at least to the free end of the chisel shaft; and 
   (b) operating the tool holder arrangement to engage a surface with the chisel and remove material from the surface.    
     
     
       19. The method of claim 18, further comprising:
 during step (b), permitting the chisel to rotate within the chisel receiver and transporting removed material through the chisel receiver in a direction away from the chisel head.    
     
     
       20. The method of claim 19, further comprising:
 allowing the removed material to escape from the chisel receiver by centrifugal forces moving the removed material through the exterior opening and thereby maintaining free rotatability of the chisel.    
     
     
       21. The method of claim 18, wherein:
 in step (a), the exterior opening extends past the free end of the chisel shaft toward the chisel insertion opening.