Abstract: A rope-suspended leader mast includes a lower part for accommodating a material to be pile-driven and an upper part for accommodating a diesel pile driver having a fuel feed. The leader mast is provided with at least one securing rope. A fuel feed interrupter interrupts the fuel feed of the diesel pile driver accommodated by the rope-suspended leader mast when the securing rope is tensioned.

Abstract: A rope-suspended leader mast includes a lower part for accommodating a material to be pile-driven and an upper part for accommodating a diesel pile driver having a fuel feed. The leader mast is provided with at least one securing rope. A fuel feed interrupter interrupts the fuel feed of the diesel pile driver accommodated by the rope-suspended leader mast when the securing rope is tensioned.

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.

Abstract: In order to be able to shift a leader (18), which is disposed on a travelling chassis (10) via a carrying mechanism (16), both towards the front and also towards the rear into a substantially horizontal position, the carrying mechanism (16) has at least one guide arm (24) which is adjustable in length and which comprises a double-acting hydraulic working cylinder.

Abstract: A double-head drilling machine is disclosed, which by changing over or converting small component units can cooperate with drill or drill pipes of different diameters. To this end, drive carriages (16) operating on drills or drill pipes, for example, comprise a carriage base element (32), to which a drive unit (42) is releasably fitted. The drive unit (42) can thus be replaced by a different drive unit having essentially the same geometry, which is designed for operating with a drill or drill pipe having a different diameter.