Piston for a setting tool

Abstract

A piston for a setting tool which is driven y expanding gases, includes a piston head ( 11 ) and a piston body ( 12 ) connectable along an interface ( 13 ) with the piston head ( 11 ), the piston head ( 11 ) and the piston body ( 12 ) having, respectively, in an interface region, at least one stop surface ( 14 ) and at least one counter-stop surface ( 15 ) formed by surfaces defining essentially complementary tapering regions.

1 . A piston for a setting tool driven by expanding gases, comprising a piston head ( 11 ); and a piston body ( 12 ) connectable with the piston head ( 1 ) along an interface ( 13 ), the piston head ( 11 ) and the piston body ( 12 ) having, respectively, in an interface region, at least one stop surface ( 14 ) and at least one counter-stop surface ( 15 ), the stop surface ( 14 ) and the counter-stop surface ( 15 ) being formed by surfaces defining essentially complementary tapering regions.  
   
   
       2 . A piston according to  claim 1 , wherein the complementary tapering regions are formed as cone-shaped region.  
   
   
       3 . A piston according to  claim 2 , wherein the stop surface ( 14 ), which is provided on the piston head ( 11 ), is formed as an inner cone, and the counter-stop surface ( 15 ), which is provided on the piston body ( 12 ), is formed as a substantially complementary outer cone.  
   
   
       4 . A piston according to  claim 1 , wherein the stop surface ( 14 ) and the counter-stop surface ( 15 ) are inclined to a surface ( 19 ) extending parallel to the piston head ( 11 ) at an angle (a) from 10° to 80°.  
   
   
       5 . A piston according to  claim 3 , wherein the complementary tapering regions are formed as spherical regions.  
   
   
       6 . A piston according to  claim 5 , wherein the stop surface ( 14 ), which is provided on the piston head ( 11 ) is formed as an inner sphere, and the counter-stop surface ( 15 ), which is provided on the piston body (I  2 ), is formed as a substantially complementary outer sphere.  
   
   
       7 . A piston according to  claim 1 , wherein the interface ( 13 ) comprises thread connection means.