Diesel hammer pile driver

Abstract

A pile-driving apparatus includes a diesel hammer pile driver having a cylinder, and a piston and a striker displaceably guided therein. A combustion chamber opens into a fuel feed device for introducing a predetermined amount of fuel into the combustion chamber during each working cycle. A disengagement apparatus axially displaceable on the cylinder outside is disposed within the cylinder, to raise the piston, has a driver introduceable into a piston undercut, through a piston recess, and has an operating lever for pivoting the driver into the cylinder space if a collision with the engagement cam occurs. A disengagement cam on the cylinder above the engagement cam pivots the driver out of the cylinder space if the operating lever collides with the disengagement cam. The engagement cam and/or the operating lever is configured for movement out of the collision region of the operating lever or of the engagement cam.

What is claimed is: 
     
         1 . A pile-driving apparatus comprising:
 (a) a diesel hammer pile driver having a cylinder comprising a cylinder interior and a cylinder outside, a piston displaceably guided in the cylinder and comprising a piston face surface, and a striker displaceably guided in the cylinder, wherein the striker is disposed underneath the piston in an operating piston of the diesel hammer pile driver and comprises a striker face surface lying in the cylinder interior;   (b) a fuel feed device;   (c) a combustion chamber delimited axially by the striker face surface and the piston face surface and opening into the fuel feed device for introducing via the fuel feed device a predetermined amount of fuel into the combustion chamber during each working cycle;   (d) a lower engagement cam disposed on the cylinder;   (e) a disengagement apparatus disposed within the cylinder and axially displaceable along the cylinder on the cylinder outside to raise the cylinder, wherein the disengagement apparatus has a driver introducible into an undercut disposed in the piston through a recess made in the piston and an operating lever for pivoting the driver into the cylinder interior if a collision with the lower engagement cam occurs; and   (f) a disengagement cam disposed on the cylinder above the lower engagement cam for pivoting the driver out of the cylinder interior if a collision of the operating lever with the disengagement cam occurs;   wherein at least one of the lower engagement cam and the operating lever is configured for movement out of a collision region of the operating lever of the disengagement apparatus or of the lower engagement cam.   
     
     
         2 . The pile-driving apparatus according to  claim 1 , wherein at least one of the lower engagement cam and the operating lever is configured as a cylinder. 
     
     
         3 . The pile-driving apparatus according to  claim 2 , wherein at least one of the lower engagement cam and the operating lever is configured as a hydraulic cylinder. 
     
     
         4 . The pile-driving apparatus according to  claim 1 , wherein the driver in the disengagement apparatus is configured so that the driver can be locked in a pivot position, in each instance, after having been pivoted in and after having been pivoted out by the operating lever. 
     
     
         5 . The pile-driving apparatus according to  claim 1 , wherein the fuel feed device comprises a pump lever that projects into the cylinder in such a manner that the pump lever is activated when the piston passes, thereby introducing fuel onto the striker face surface, wherein a disengagement cam is provided that can be positioned so that if the operating lever collides with the disengagement cam, the piston has not yet moved past the pump lever, so that no introduction of fuel into the combustion chamber takes place. 
     
     
         6 . The pile-driving apparatus according to  claim 5 , wherein the disengagement cam is disposed on the cylinder in an axially displaceable manner, and is fixable in place in at least first and second positions, wherein fixing of the disengagement cam in the first position brings about disengagement of the piston in a position after passing the pump lever, and fixing the disengagement cam in the second position brings about disengagement of the piston in a position before passing the pump lever. 
     
     
         7 . The pile-driving apparatus according to  claim 5 , wherein an upper, first disengagement cam and a lower, second disengagement cam are disposed on the cylinder axially at a distance from one another, wherein the upper, first disengagement cam is disposed in such a manner that if a collision with the operating lever of the disengagement apparatus occurs, disengagement of the piston in a position after passing the pump lever is brought about, and the lower, second disengagement cam is disposed so that if a collision with the operating lever of the disengagement apparatus occurs, disengagement of the piston in a position before passing the pump lever is brought about, wherein the lower, second disengagement cam is configured so that the lower, second disengagement cam is moveable out of the collision region of the operating lever of the disengagement apparatus. 
     
     
         8 . The pile-driving apparatus according to  claim 7 , wherein the lower, second disengagement cam is configured as a cylinder. 
     
     
         9 . The pile-driving apparatus according to  claim 8 , wherein the lower, second disengagement cam is configured as a hydraulic cylinder.