Expansion anchor

Abstract

The present invention relates to an expansion anchor, in particular for mining, wherein at least one widenable expansion element is provided on the external side of the expansion anchor including an anchor rod, wherein the expansion element in a retention element fixed to the anchor rod is maintained in an abutment position during the insertion of the expansion anchor into a hole and the expansion element is expansible by the expansion element cooperating with a stop element anchored within the bore hole, wherein the expansion element is expansible through a movement of the anchor rod in the direction towards the opening of the bore hole.

1 . An expansion anchor, in particular for mining, wherein at least one widenable expansion element is provided on the external side of the expansion anchor including an anchor rod, wherein the expansion element in a retention element fixed to the anchor rod is maintained in an abutment position during the insertion of the expansion anchor into a hole and the expansion element is expansible by the expansion element cooperating with a stop element anchored within the bore hole, wherein the expansion element is expansible through a movement of the anchor rod in the direction towards the opening of the bore hole.  
     
     
         2 . An expansion anchor according to  claim 1 , wherein the retention element for the expansion element is comprised of a sleeve element surrounding the anchor rod.  
     
     
         3 . An expansion anchor according to  claim 1 , wherein the widenable expansion element is guided or pivotably mounted in the retention element.  
     
     
         4 . An expansion anchor according to  claim 3 , wherein the expansion element in the region of the retention element is held by a retaining ring.  
     
     
         5 . An expansion anchor according to  claim 1 , wherein the expansion element in its end received within the retention element is designed to include at least one chamfer or bevelment.  
     
     
         6 . An expansion anchor according to  claim 1 , wherein the widenable expansion element on its end facing the stop element is formed with a further chamfer or profiling which cooperates with a complementary chamfer or profiling provided on the stop element.  
     
     
         7 . An expansion anchor according to  claim 1 , wherein a plurality of widenable expansion elements are arranged so as to be substantially uniformly distributed about the periphery of the expansion anchor.  
     
     
         8 . An expansion anchor according to  claim 1 , wherein a plurality of widenable expansion elements are provided on the periphery of the expansion anchor at different distances from the tip of the expansion anchor.  
     
     
         9 . An expansion anchor according to  claim 8 , wherein expansion elements arranged at different distances from said tip are arranged so as to be mutually offset in the peripheral direction.  
     
     
         10 . An expansion anchor according to  claim 8 , wherein expansion elements arranged at different distances from said tip are provided with different chamfers or profilings for cooperation with complementary chamfers or profilings of the associated stop elements.  
     
     
         11 . An expansion anchor according to  claim 1 , wherein the expansion element is variable in terms of length, in particular telescopic.  
     
     
         12 . An expansion anchor according to  claim 1 , wherein an expansion element that is divided in the peripheral direction surrounds the anchor rod in an umbrella-like manner and is comprised of plate-shaped elements connected, in particular articulately, with one another.  
     
     
         13 . An expansion anchor according to  claim 1 , wherein the stop element via a spring washer cooperates with a jacket tube from a preceding drilling procedure arranged within the bore hole.