Abstract: An implement comprises an internal combustion engine having a throttle valve. At least one handle, the inside of which is provided with a gas lever likewise in a pivotal manner, is attached to a housing surrounding the internal combustion engine. The minimum distance between the gas lever and the handle is defined by a stop. When the operator lifts the implement by the handle, the position of the gas lever also changes. Even when the gas lever is fully depressed, only a part-load position is achieved at the throttle valve. In this way, effective rotational speed limitation is achieved.

Abstract: The invention relates to a hammer and/or hammer drill acting as a breaker, having a drive, a hammer mechanism driven by the drive, and a crank device disposed in the force flow path between the drive and the hammer mechanism and coupled to an element of the hammer mechanism for transforming a rotary motion of the drive into an oscillating translation motion of the element of the hammer mechanism. A collecting device for collecting lubricant is provided above the hammer mechanism relative to a vertical operating position. The collecting device may be a collecting tank open at the top and defined by a partition of the housing and a separating floor. A connecting rod of the crank device may extend through a cutout in the separating floor. Lubricant collects above the separating floor can be delivered again and again into the interior of the housing by a delivery element.

Abstract: An implement having a drive, a drive element that may be driven by the drive and that is disposed in an axially moveable manner and is coupled to the drive element, and an overrunning clutch disposed in the drive or in a torque flux between the drive and the drive piston. If the drive has a movement that is slower than that of the drive element, the overrunning clutch is in an idle state, in which the clutch interrupts the torque flux between the drive and the drive element, thus decoupling the movement of the drive element from the drive torque of the drive. In this manner, the drive element may move more rapidly, for example during the return movement thereof, than would correspond to the movement forced by the drive.

Abstract: An implement has an internal combustion engine and a hydraulic system that can be driven by the internal combustion engine for bringing about a working movement. Furthermore, an energy accumulator is provided for the storage of energy in an accumulation phase in which the output delivered by the internal combustion engine is greater than the output currently required by the hydraulic system, and for the delivery of energy in a discharge phase in which the output delivered by the internal combustion engine is smaller than the output currently required by the hydraulic system. The energy accumulator thus serves for balancing output peaks and valleys such that the internal combustion engine may always be operated within an optimum range of rotational speeds.

Abstract: A percussion mechanism that has a motor, a drive piston which can be moved to and fro in a guide cylinder by the motor, and a percussion piston. A coupling device is active between the drive piston and the percussion piston, via which coupling device the movement of the drive piston is transmitted to the percussion piston. The motor can be configured as a reluctance motor or as a synchronous motor. The motor can be actuable in such a way that different rotational speeds of the rotor can be generated within a percussion cycle and/or from percussion cycle to percussion cycle.

Abstract: A tamper as a soil-compacting device having a combustion engine, a soil contact element, and a motion conversion device for converting a rotary movement of the combustion engine into an oscillating linear movement of the soil contact element. Furthermore, a clutch device for connecting and interrupting the force flow between the combustion engine and the motion conversion device is provided. In addition to the combustion engine, an electric motor with a rotor and a stator is provided, wherein the operator can switch between the combustion engine and the electric motor. The rotor can be arranged directly on a clutch bell of the clutch device.

Abstract: The invention relates to an outside concrete vibrator for mounting to a concrete formwork, comprising an oscillation exciter that can be driven by an electric motor, a carrier that supports the oscillation exciter and that can be mounted on the concrete formwork, and at least one electric supply line having a power supply leading to the electric motor. A detection device inductively detects a power state in the power supply. The detected power state can be displayed via an optical signal via a display device.

Abstract: An apparatus for detecting damage to a machine that is excited at a previously known frequency by a vibration exciter, including an acceleration sensor for recording a current amplitude spectrum of an upper mass. A previously known amplitude spectrum of the upper mass is stored in a memory device. The current amplitude spectrum is compared with the previously known amplitude spectrum in a comparison device. If the comparison device determines that the spectra differ from one another, a corresponding deviation signal is generated and is output via a display device for informing the operator in order to inform the latter of possible damage.

Abstract: A vibrating plate comprises a vibration generator device, which can be controlled in such a manner that the direction of the action of force can be set at a number of locations, particularly in more than two locations. In addition, an advance adjusting device is provided for controlling the vibration generator device whereby the direction of the action of force is set in a position in which a maximum possible advance of the vibrating plate is reached. The direction of the action of force can be changed according to a change in the surroundings of the vibrating plate, particularly to the slope and/or the hardness of a subsoil to be compacted by a soil contact plate. Alternatively, the direction of the action of force can be changed according to the wishes of the operator.

Abstract: A tamping device comprises a drive motor which, via a spring mechanism, drives a soil contact element for compacting the soil. A detection device records the speed of rotation of the drive motor. An evaluation device evaluates the dynamic response of the speed of rotation and recognizes an aperiodic response. A control device prompts a change in the speed of rotation of the motor if an aperiodic response has been recognized.

Abstract: A vibration plate has an upper mass having a drive and a lower mass which is mounted so it is elastically moveable relative to the upper mass. The lower mass has a vibration generator and a ground contact plate. The drive is coupled by a belt drive to the vibration generator. The belt drive has a drive disk which is provided on the drive, an output disk which is provided on the vibration generator, and a belt which circulates between the drive disk and the output disk. To this end, at least two further deflection rollers are provided for guiding the belt.

Abstract: The invention relates to an oil supply for an internal combustion engine, comprising an oil supply device for the supply of oil to a piston, reciprocating in a cylinder. The oil supply device is embodied such that at least at a point at which the piston is in the region of bottom dead centre, oil is introduced directly into a region below the piston, by means of the oil supply device, in particular, beneath the piston crown and within the piston skirt. The oil supply device thus comprises at least one tube element, extending into a region beneath the piston crown. The tube element terminates as close as possible to a gudgeon pin, when the piston is at bottom dead center. A targeted lubrication of the mechanically and thermally highly loaded gudgeon pin can thus be guaranteed. It is also possible by means of the oil supply to supply transfer ports of a two-stroke engine with oil, counteracting a tendency to coke up.

Abstract: The invention relates to a vibrating plate for ground compaction, said plate comprising a remote control device for controlling at least one forward or rear journey by the excitation of an oscillation device. The remote control device comprises an emitter unit, which can be displaced independently of the remaining vibrating plate and which can be detachably fixed to a draw bar. In a remote control mode, the emitter unit is held by the user and displaced independently of the vibration plate. In a draw bar mode, the emitter unit is placed on one end of the draw bar, so that the user can guide the vibrating plate by the pulling and pushing of robust control handles on the emitter unit. The latter can have at least one control handle, which can be used not only to input control commands for controlling the oscillation device, but can also be held by the user to manually guide the vibrating plate.

Abstract: A vibrator for a ground compaction apparatus includes two parallel shafts which are coupled to one another be rotatable in opposite directions and on each of which is at least one unbalanced mass is disposed. A phase adjusting mechanism is used for modifying the phase angle of the two unbalanced masses relative to each other. In order to do so, the actual phase angle of the two unbalanced masses is detected with the help of proximity sensors or the like. A regulating device compares the actual phase angle with a desired phase angle that is predefined by the operator and controls the phase adjusting mechanism in such a way that the difference between the actual phase angle and the desired phase angle is minimal.