Abstract: A device for monitoring pressure within a gas space, which is filled with gas, preferably nitrogen, and/or is prestressed, of a pressure accumulator of a hydraulically driven percussive mechanism having a housing in which a piston is mounted, together with a display element which extends through the face surface of the housing, so as to be slidingly movable counter to the force of a spring, wherein the piston divides the housing into a pressure chamber and a spring chamber. The spring acts on a spring chamber-side working surface of the piston, and the pressure accumulator is at least indirectly operatively connected to the pressure chamber-side working surface of the piston, such that, in the event of a critical pressure within the pressure accumulator being undershot, the piston and the display element are displaced to such an extent that the display element protrudes out of the housing.

Abstract: A device for monitoring the pressure within a gas space, which is filled with a gas, preferably nitrogen, and/or is prestressed, of a pressure accumulator of a hydraulically driven percussive mechanism, in particular of a demolition hammer or of a drilling hammer, having a housing in which a piston is mounted, together with an indicator element which extends through the face surface of the housing, in slidingly movable fashion. The piston divides the housing into two chambers, and a first, pressure accumulator-side chamber and a pressure accumulator-side working surface, which is averted from the indicator element, of the piston are operatively connected at least indirectly to the gas space of the pressure accumulator. A second, hydraulics-side chamber and a hydraulics-side working surface, facing toward the indicator element, of the piston are connected to the hydraulic system of the percussive mechanism.

Abstract: The present invention relates to a valve for a hydraulically operated percussion mechanism having a main valve (2, 102) which is in the form of a rotary slide valve having a rotary slide. In order to reduce the installation space and the production costs of such valves, it is proposed according to the invention that the rotary slide is configured as a receiving housing which receives a valve element in the form of a secondary valve (68, 114). Furthermore, the invention relates to the use of a valve which is arranged on a percussion mechanism of a hydraulic hammer.

Abstract: The present invention relates to a hydraulic attachment comprising a hydraulic circuit, the attachment being a construction or demolition tool, in particular a hydraulic breaker, demolition shears, scrap shears, a pulverizer, a gripper, a crusher bucket or a compactor, which can be mechanically connected to a support device and hydraulically connected to the hydraulic system of the support device. In order to enable the hydraulic circuit to be opened quickly and safely within an attachment and, in particular, to make it possible to display the presence of a particular pressure level within a hydraulic attachment and to determine whether a dangerous residual pressure is present in the system, a hydraulic attachment is proposed that has a residual pressure display (40) which is connected to the hydraulic circuit of the attachment in a detachable or non-detachable manner.