Abstract: A tube holder for a tube filling machine includes a cup-shaped housing having a tube receptacle that opens towards the top and into which one end area of a tube can be inserted. At least one vertical groove is formed in the area of the inner wall of the tube receptacle into which a clamping element is inserted, wherein the clamping element can be radially displaced substantially perpendicularly to the longitudinal central axis of the tube receptacle and is pivotably disposed about a pivot axis that extends substantially tangentially relative to the inner wall of the tube receptacle. A clamping force that acts radially from the outside onto the inserted tube can be applied by the clamping element under the action of upper and lower spring elements. The pivot axis is thereby formed on a pivot bearing which permits radial displacement of the pivot axis.

Abstract: The invention relates to a reciprocating piston pump for delivering a liquid. The pump includes a solenoid with an actuator and an outlet port. A check valve with a seat body is assigned to the outlet port for keeping a return flow of the liquid out of the reciprocating piston pump. The seat body bears an impact damping face at a front face facing away from a valve seat of the check valve, and the valve seat of the check valve and the impact damping face are made from the same elastomer material.

Abstract: A current source inverter is disclosed, comprising: means for operating the inverter in fundamental frequency unregulated operation, means for operating the inverter in clocked voltage regulated operation, means for recording parameters from which conclusions can be drawn at an instantaneous operating point and/or at an instantaneous network condition, means for determining an appropriate operating condition from the recorded parameters and means for uninterrupted switching of the operation of the inverter to the operating condition as determined from the recorded parameters and a method for uninterrupted switching of such a current source inverter.

Abstract: In a method for operating a spark-ignition internal combustion engine with direct fuel injection in the post-start phase at low temperatures, fuel is supplied to the combustion air in a pilot injection (MH) of a first fuel quantity during an intake stroke of the internal combustion engine such that the pilot injection (MH) forms a homogeneous, lean air/fuel mixture (?>1) in substantially the entire combustion chamber, and a main injection (MS) of a second fuel quantity is subsequently injected into the combustion chamber during a compression stroke directly before the ignition time (ZT), said main injection (MS) forming in the region of the spark plug a stratified, rich air/fuel mixture (?<1), which is then ignited by the spark plug.

Abstract: In a method of operating an internal combustion engine with direct fuel injection such that, in the engine startup period, a three-way catalytic converter disposed in the engine exhaust system is rapidly heated to a working temperature, in that a fuel quantity which is injected is injected in two separate injection steps with the first fuel volume being injected during the intake stroke and the second fuel volume being injected during the expansion stroke so as to form immediately before the ignition instant a rich stratified charge cloud in the region of the spark plug thereby ensuring reliable ignition of the stratified cloud while, overall, achieving a lean fuel/air mix in the combustion chamber.

Abstract: An apparatus for riveting shell components to form a barrel-shaped structure such as an aircraft fuselage includes an outer part and an inner part that operate coordinated with each other under computer control. The outer apparatus part includes a riveting machine system movably carried on an annular machine guide that is supported on a stand that is movable in a length-wise X-direction. The inner apparatus part includes a multi-axis riveting robot mounted on a mounting frame that is movable along the X-direction. Instead of moving the inner and outer apparatus parts in the X-direction, it is alternatively possible to move the fuselage while keeping the apparatus parts stationary. A computer control unit provides control signals to achieve a coordinated and concurrent positioning of the inner and outer apparatus parts, and to carry out a coordinated sequence of riveting steps.

Abstract: A system includes a switching device, a sound device and an evaluation device. The switching device includes a housing and a contact system disposed in the housing, the contact system including a contact piece carrier and a contact piece disposed on the contact piece carrier. The sound device produces and captures structure-borne sound waves so as to determine an equivalent criterion for determining the remaining service life of the contact piece. The evaluation device evaluates the equivalent criterion.

Abstract: A system includes a switching device, a sound device and an evaluation device. The switching device includes a housing and a contact system disposed in the housing, the contact system including a contact piece carrier and a contact piece disposed on the contact piece carrier. The sound device produces and captures structure-borne sound waves so as to determine an equivalent criterion for determining the remaining service life of the contact piece. The evaluation device evaluates the equivalent criterion.

Abstract: The invention relates to a process for preparing alkylchlorosilanes from the liquid constituents of the residues from the direct synthesis of alkylchlorosilanes which have a boiling point of above 70° C. at 1013 hPa and comprise disilanes, in which the residues are heated with hydrogen chloride and silicon at temperatures of at least 300° C., with at least 10% by weight of trichlorosilane and/or tetrachlorosilane, based on the weight of the alkylchlorosilanes formed, being formed at the same time.

Abstract: An apparatus for riveting shell components to form a barrel-shaped structure such as an aircraft fuselage includes an outer part and an inner part that operate coordinated with each other under computer control. The outer apparatus part includes a riveting machine system movably carried on an annular machine guide that is supported on a stand that is movable in a lengthwise X-direction. The inner apparatus part includes a multi-axis riveting robot mounted on a mounting frame that is movable along the X-direction. Instead of moving the inner and outer apparatus parts in the X-direction, it is alternatively possible to move the fuselage while keeping the apparatus parts stationary. A computer control unit provides control signals to achieve a coordinated and concurrent positioning of the inner and outer apparatus parts, and to carry out a coordinated sequence of riveting steps.

Abstract: A fuselage is substantially simultaneously fabricated, equipped and outfitted in an assembly area including adjacent riveting, equipping and outfitting zones. The riveting zone includes an external riveting apparatus working from the outside of the aircraft fuselage, and an internal riveting apparatus working from the inside of the fuselage to fabricate and join a first fuselage section to an initial structure. The first fuselage section is moved from the riveting zone into an equipping zone, wherein equipment, such as pipes, ducts, hoses, pumps, blowers and structural components and fittings of the aircraft, is installed in the first fuselage section, while simultaneously a second fuselage section is being rivet-joined onto the first fuselage section in the riveting zone. The second fuselage section is moved from the riveting zone into the equipping zone, and the first fuselage section is moved from the equipping zone into the outfitting zone.