Pile hammer

Abstract

A pile hammer includes a cylinder, a piston displaceably guided in the cylinder, and a striker displaceably guided in the cylinder. The striker is disposed underneath the piston in the operating position of the pile hammer. A combustion chamber is delimited axially by a face surface of the striker that lies in the interior of the cylinder and by a face surface of the piston. Using at least one fuel feed device a predetermined amount of fuel can be introduced into the combustion chamber during each work cycle. The piston has a cavity that is filled, at least in part, with a movable filler.

What is claimed is: 
     
         1 . A pile hammer comprising:
 (a) a cylinder having an interior;   (b) a piston displaceably guided in the cylinder and having a piston face surface, said piston being formed by a piston material;   (c) a striker displaceably guided in the cylinder and disposed underneath the piston in an operating position, said striker having a striker face surface lying in the interior of the cylinder;   (d) a combustion chamber delimited axially by the striker face surface and by the piston face surface; and   (e) at least one fuel feed device for introduction of a predetermined amount of fuel into the combustion chamber;   wherein the piston has a cavity that is filled at least in part with a filler material different from the piston material   
     
     
         2 . The pile hammer according to  claim 1 , wherein the filler is disposed within the cavity in movable manner. 
     
     
         3 . The pile hammer according to  claim 1 , wherein the cavity of the piston is closed off with a lid that is releasably connected with the piston. 
     
     
         4 . The pile hammer according to  claim 1 , wherein the filler is formed from at least one of a bulk material and a liquid. 
     
     
         5 . The pile hammer according to  claim 4 , wherein the filler contains at least one of quartz sand and metal blasting medium. 
     
     
         6 . The pile hammer according to  claim 5 , wherein the metal blasting medium is a steel blasting medium, a lead blasting medium, or an aluminum blasting medium. 
     
     
         7 . The pile hammer according to  claim 5 , wherein the filler is formed by particles having an essentially round geometry. 
     
     
         8 . The pile hammer according to  claim 4 , wherein the filler is formed by at least one of water and oil. 
     
     
         9 . The pile hammer according to  claim 1 , further comprising a projection for engagement of a disengagement apparatus, wherein the projection is disposed on the piston, on an end of the piston lying opposite the combustion chamber. 
     
     
         10 . The pile hammer according to  claim 1 , further comprising an encapsulation hood for placement onto a concrete pillar, wherein the encapsulation hood has a passage for the striker to pass through. 
     
     
         11 . The pile hammer according to  claim 10 , wherein at least one sound absorption element is disposed in the encapsulation hood, surrounding the passage opening.