Abstract: The method for damping global flow oscillations (20a.x, 20b.x) in a flowing medium in the region of an unstable flow (10) separating itself from at least one boundary surface (11, 12) is comprised of detecting the global flow oscillations with a sensor system (13) and superimposing a compensatory oscillation (15, 16) controlled by the signals of the sensor system onto the flowing medium in a separation zone of the separated unstable flow. Correspondingly, the apparatus for performing the method comprises a generator (17, 18) which superimposes a compensatory oscillation on the flowing medium in a separation zone of the separated unstable flow and a control system (28, 29) which evaluates the signals of the sensor system and controls the compensatory oscillation so that the amplitude of the global flow oscillation is damped by a prespecified factor.

Abstract: A dismountable display cabinet comprises a box-shaped container, consisting of a base part 4 and a lid part 6. A dismountable framework can be mounted on the base part 4, the framework including posts 12 to 22 which have guide grooves for receiving side wall elements and shelf elements in the form of glass panes in a displaceable manner. The lid part 6 of the container forms the top closure of the display cabinet. In the dismantled state of the display cabinet the individual parts of the framework, the shelves and the side walls are stowed inside the container. In the dismantled state the display cabinet can be easily transported, requires litle space and can be assembled and dismantled very rapidly and simply.

Abstract: The fastening device (5) for the releasable fastening of a strut (3a-3d) to a column (1) comprises a retainer ring (7), attachable to the column (1), and a connecting element (9a-9d) for connecting the strut (3a-3d) to the retainer ring (7). The connecting element (9a-9d) has at one of its ends diametrically opposed jaws (33a, 33b) which extend around the lateral surfaces (16a) of the retainer ring (7) whereby the strut (3a-3d) is fastened to the column (1) safe from twisting even with respect to large torques and bending moments. The exact horizontal position of the strut or struts (3a-3d) can be adjusted by rotating the retainer ring (7).

Abstract: A plastic mass of a blast nozzle contains a filler which is at least partially composed of powder of one or more metals. The proportion of metal powder amounts to at most 30 percent by weight, preferably 5 to 15 percent by weight. As the filler there is particularly suitable, alone or in combination, the metals of tungsten, copper, aluminum and iron. The electrically conductive filler prevents penetration of the electromagnetic radiation emanating from the arc into the interior of the blast nozzle, resulting in an appreciable reduction in nozzle burn-off.

Abstract: A gas-blast switch provided with two coaxially arranged contact elements which can be brought into and out of engagement with one another by carrying out an axial movement. The first contact element which is connected with a drive is arranged in a fixed reference position forwardly of a blast nozzle. The blast nozzle is connected at its inlet side with a compression chamber or space which can be pressurized during the cut-off stroke of the gas-blast switch. In the cut-on stroke of such gas-blast switch the second contact element engages with the blast nozzle. The second contact element is surrounded by a screening body which, in turn, can be shifted back by means of the blast nozzle, during a cut-on stroke of the gas-blast switch, out of its advanced position in the cut-off position, against the action of a spring, along the second contact element.

Abstract: A movable contact element is coupled by a step-up lever drive with a drive rod. The movable contact element is surrounded by a blast nozzle which moves along with the movable contact element. The blast nozzle is connected to a pump cylinder containing an extinguishing gas. The pump cylinder is guided to be vertically displaceable upon a pump piston and this pump piston is hingedly connected with one end of a first element of a toggle lever which in the cut-on position is in its bent position or mode, the second element of the toggle lever being hingedly connected at a stationary location. The toggle joint of the toggle lever is likewise coupled with the drive rod, so that during a cut-off stroke the toggle lever is extended and then again bent.

Abstract: A gas-blast switch containing a stationary and a movable contact element. A blast nozzle associated with one of the contact elements possesses a blast channel, which during the course of the cut-off stroke, is freed from the other contact element. Additionally, there is provided a blast-in opening, transversely arranged with respect to the extinguishing path and opening into the blast channel. The blast-in opening has a flow cross-section which is appreciably smaller than that of the blast channel. Both the blast channel and the blast-in opening flow communicate with a pump compartment containing an extinguishing gas and which can be pressurized by the cut-off stroke of the switch.

Abstract: A gas-blast switch having a pump cylinder conjointly movable with a movable contact element, the pump cylinder enclosing a pump chamber containing extinguishing gas and feeding a blast nozzle. Within the pump cylinder there is movably arranged a pump piston which, during the course of the cutoff stroke, displaces the extinguishing gas out of the pump chamber through the blast nozzle. In order to utilize the drive energy at the start of the cutoff stroke extensively for accelerating the movable switch elements and to somewhat delay in time the compression of the extinguishing gas in the pump chamber, likewise requiring the drive energy, there is hingedly connected at the pump piston one element of a toggle lever which is fixedly hinged at its other element and assumes a bent position in the cuton position. The toggle lever is guided by a guide element coupled with the movable contact element.

Abstract: A gas-blast switch having a movable contact element and a stationary contact element and a blast nozzle operatively associated with one of the contact elements and surrounding the same. The blast nozzle, during the course of the cut-off stroke of the gas-blast switch, is connected with a pump chamber or compartment which can be placed under pressure. The nozzle chamber is constituted by an inlet space converging towards the nozzle throat and an outlet space diverging away from such throat. In the blast nozzle there are additionally formed channels which flow communicate with the pump chamber. These channels open at an angle with respect to the nozzle axis into the nozzle chamber in order to additionally cause a blowing of the arc transversely in addition to the axial blowing of the arc in the blast nozzle.

Abstract: A fineblanking press having two groups of elements, the first group including an interchangeable die set having an upper die member, a lower die member and guide posts with the second group including a support plate, guide pins and an ejector element, the separate groups providing improved interchangeability, maintenance and stability.

Abstract: A puffer-type interrupter for a circuit breaker has a stationary piston received in a movable cylinder which is connected to the movable contact of the interrupter, and which also carries a nozzle for producing a blast of gas through the separating contacts of the interrupter when the cylinder is moved over the piston. An auxiliary piston is slidably mounted relative to the main piston, and mechanism is provided to connect the two pistons together when the interrupter contacts are closed, and to connect the auxiliary piston to the movable cylinder after the contacts have separated.

Abstract: A gas-blast switch possessing a fixed contact and a movable contact and a blast or discharge nozzle surrounding one of the contacts, the blast nozzle having its inlet connected with the outlet of a pump compartment for an extinguishing gas, this pump compartment can be pressurized by the switch cut-off or switching-off movement, and wherein the narrowest location or throat of the blast nozzle is arranged in the direction of blowing downstream with respect to the aforementioned one contact. The outlet of the pump compartment can be closed by a check or nonreturn valve which closes in the direction of the pump compartment. The inlet of the blast nozzle is connected via a gas chamber with the outlet of the pump compartment, the outlet of the gas chamber confronting the blast nozzle can be closed by means of a further check or nonreturn valve which closes in the direction of the gas chamber.