Pile hammer

Abstract

A pile hammer includes a cylinder, a piston displaceably guided in the cylinder, a striker displaceably guided in the cylinder and disposed underneath the piston in the operating position of the pile hammer, a combustion chamber 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, as well as a disengagement apparatus by way of which the piston can be moved in the cylinder, into an upper position, wherein the disengagement apparatus includes a carriage, which is connected with at least one cable, by way of which the carriage is guided to be displaceable on the outside, along the cylinder, wherein a stop that projects outward is disposed on the cylinder and a buffer part is disposed on the carriage, with which part the carriage lies against the stop in an upper end position.

What is claimed is: 
     
         1 . A pile hammer comprising:
 (a) a cylinder having an interior;   (b) a stop disposed on the cylinder and projecting outward from the cylinder;   (c) a piston displaceably guided in the cylinder and having a piston face surface;   (d) 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;   (e) a combustion chamber delimited axially by the striker face surface and by the piston face surface;   (f) a disengagement apparatus for moving the piston in the cylinder into an upper position, said disengagement apparatus comprising at least one cable and a carriage connected with the at least one cable for guiding the carriage to be displaceable along an outside portion of the cylinder and a buffer part disposed on the carriage, said buffer part lying against the stop in an upper end position.   
     
     
         2 . The pile hammer according to  claim 1 , wherein the at least one cable is guided between at least one pair of guide rollers disposed on the cylinder. 
     
     
         3 . The pile hammer according to  claim 1 , further comprising a leader attached to the cylinder and comprising at least one pair of guide rollers, wherein the at least one cable is guided between the at least one pair of guide rollers. 
     
     
         4 . The pile hammer according to  claim 3 , wherein the guide rollers of the at least one pair of guide rollers have axes disposed on a line parallel to a center axis of the cylinder. 
     
     
         5 . The pile hammer according to  claim 4 , wherein the guide rollers of the at least one pair of guide rollers are disposed and dimensioned so that in a vertical position of the cylinder, the at least one cable, in a tensed state, is offset toward the center axis of the cylinder. 
     
     
         6 . The pile hammer according to  claim 5 , wherein the at least one cable runs through the guide rollers of the at least one pair of guide rollers, in the tensed state, on an extended center axis of the cylinder. 
     
     
         7 . The pile hammer according to  claim 1 , further comprising a guide anchor disposed on the carriage, first and second pairs of guide rollers disposed on the cylinder, or on a leader attached to the cylinder, at a distance from one another, and first and second cables passing around the guide anchor and guided on first and second sides of the guide anchor between two guide rollers of the first and second pairs of guide rollers, respectively. 
     
     
         8 . The pile hammer according to  claim 7 , wherein the guide rollers of the first and second pairs of guide rollers have a radially circumferential guide groove, in each instance, to accommodate the first and second cables, respectively, wherein the groove aligns with a guidance of the guide anchor. 
     
     
         9 . The pile hammer according to  claim 8 , wherein the guide anchor is disposed orthogonal to a longitudinal center axis of the carriage. 
     
     
         10 . The pile hammer according to  claim 1 , wherein the buffer part is configured to be elastic, at least in certain regions. 
     
     
         11 . The pile hammer according to  claim 1 , wherein the buffer part is elastically mounted on the carriage. 
     
     
         12 . The pile hammer according to  claim 7 , wherein each cable that runs around the guide anchor is connected with a traverse at two ends of the respective cable, wherein the traverse is provided with an accommodation for a crane cable. 
     
     
         13 . The pile hammer according to  claim 12 , wherein the accommodation is formed by a shackle for accommodating a crane hook. 
     
     
         14 . The pile hammer according to  claim 1 , wherein the stop has a contact piece that projects beyond the carriage. 
     
     
         15 . The pile hammer according to  claim 14 , further comprising a first end and a second end opposite the first end, wherein the carriage is disposed on the first end and a contact part is disposed on the second end parallel to the contact piece. 
     
     
         16 . The pile hammer according to  claim 15 , wherein the contact part is a roller body.