Abstract: A hydraulic arrangement is provided with at least one pressure accumulator for a hydraulic fluid, a hydraulic cylinder with at least one chamber to which pressure can be applied, a connecting line, on the basis of which the at least one accumulator is connected with the chamber, and a control unit. In order to provide an electronic pipe break safety device, an electronically controlled on-off valve is mounted in the connecting line and coupled for receiving control signals from the control unit, and a signal transmitter, which is coupled for monitoring the pressure in the connecting line is also connected to the control unit. If a pressure drop occurs in the connecting line, a signal change is generated by means of the signal transmitter, whereupon the control unit sends a signal effecting movement of the shut-off valve to its closed position.

Abstract: A hydraulic arrangement is provided with at least one pressure accumulator for a hydraulic fluid, a hydraulic cylinder with at least one chamber to which pressure can be applied, a connecting line, on the basis of which the at least one accumulator is connected with the chamber, and a control unit. In order to provide an electronic pipe break safety device, an electronically controlled on-off valve is mounted in the connecting line and coupled for receiving control signals from the control unit, and a signal transmitter, which is coupled for monitoring the pressure in the connecting line is also connected to the control unit. If a pressure drop occurs in the connecting line, a signal change is generated y means of the signal transmitter, whereupon the control unit sends a signal effecting movement of the shut-off valve to its closed position.

Abstract: A circuit for a flash stroboscope for examining vocal chord functions has a number of band-pass filters connected in parallel which have different cut-off frequencies. The acoustic signal generated by the vocal chords is fed to the inputs of these filters as an electrical signal after conversion in an electro-acoustic transducer. The output signal or fundamental wave signal allowed to pass by filter with a fundamental frequency of interest for the examination is supplied to a lamp circuit, which activates a flash lamp by trigger pulses generated from the fundamental wave. The band-pass filters are scanned automatically and successively to determine the presence of an output signal having the fundamental frequency of interest. The scanning operation is stopped upon detection of an output signal of this frequency at one of the filter outputs, so that the output of this filter can be connectd to the lamp circuit.

Abstract: A video endoscope has a strobe lamp operable in a mode wherein the strobing is synchronized to a selected tone or a periodic vibration in a patient, such as from the vocal cords, and is alternatively operable in a mode wherein the strobing is so rapid so as to appear as a substantially continuous light source. In the second mode, wherein the resulting image is to be displayed by a video system, the trigger circuit for operating the lamp is supplied with the video signal so that the lamp is triggered during either the horizontal or vertical blanking interval so that triggering of the strobe lamp does not cause interference in the video picture.