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    • 7. 发明专利
    • ELECTROMAGNETIC ROTATIONAL POSITIONING DEVICE
    • GB1433561A
    • 1976-04-28
    • GB1506874
    • 1974-04-04
    • SCHWARZER GMBH FRITZ
    • A61B5/0432G01R5/14G01D7/00G01R5/18G01R13/04H02K26/00H02K1/06
    • 1433561 Moving iron instruments FRITZ SCHWARZER GmbH 4 April 1974 [6 April 1973] 15068/74 Heading G1U An electromagnetic positioning device (e.g. a pen-recorder movement) comprises a rotatable armature permeated by a permanent magnetic field produced by a magnet mounted in a support of magnetically permeable material which also houses the armature and a conductor which when carrying current, generates a magnetic field which has two parts, one on each side of the armature axis of rotation which parts have opposite directions. All the magnetic fields are however orthogonal to the axis of rotation. As shown, magnets M mounted in recesses 5, 6 produce a field (full line) which crosses the radial gaps between poles 10-13 and the armature A. A coil W produces a second field (dotted) having two parts which pass in opposite directions through the armature. The effect of the current in the coil W is to increase the flux in diagonally opposite gaps and decrease it in the other two gaps. The armature thus rotates to the position of minimum reluctance and takes up a position indicating the current in the wire. The direction of rotation indicates the polarity of the current.
    • 8. 发明专利
    • DE2340123A1
    • 1975-02-20
    • DE2340123
    • 1973-08-08
    • SCHWARZER GMBH FRITZ
    • SUESSMILCH KLAUS DIPL-ING
    • A61B5/308A61N1/08H02H1/00H02H3/04H02H3/08
    • 1473365 Protective circuits FRITZ SCHWARZER GmbH 7 Aug 1974 [8 Aug 1973] 34820/74 Heading H2K An overcurrent protective circuit comprises a sensor 2 sensing current flowing between electromedical patient maintaining equipment and electrodes on a patient, means 5 converting this current to a direct voltage, a comparator 6 which generates a signal when this direct voltage exceeds a reference voltage and actuates a switch 3 via a trigger 7 to interrupt the circuit between the patient and the monitoring equipment. The sensor is a resistor, the means 5 converting the current to direct voltage comprises a filter and full-wave rectifier, and the comparator may be a differential amplifier. To prevent dangerous current flowing due to coupling with external circuits the protective circuit is powered by a battery 8. Further protection can be provided against excess or unbalanced currents in the battery leads by inserting sensors in these leads too, Fig. 2, not shown. An alarm circuit may be connected to the comparator 6 to indicate that a fault has occurred, Fig. 3, not shown, there being a further sensor or opto-electrical isolator in the alarm lead. A test circuit may be incorporated with the protective circuit so that correct working of the protective circuit can be checked, Fig. 4, not shown. In connection with this test circuit, the switch in the protective circuit may be a changeover switch which in the case where the sensor detects an overcurrent applies a calibration voltage to the electromedical monitoring equipment, Fig. 5, not shown. The switch in all embodiments may be arranged to reclose after a predetermined period of time, but will immediately reopen if the overcurrent is again sensed.
    • 10. 发明专利
    • SE396260B
    • 1977-09-12
    • SE7410114
    • 1974-08-07
    • SCHWARZER GMBH FRITZ
    • SUESSMILCH K
    • A61N1/08A61B5/308H02H1/00H02H3/04H02H3/08
    • 1473365 Protective circuits FRITZ SCHWARZER GmbH 7 Aug 1974 [8 Aug 1973] 34820/74 Heading H2K An overcurrent protective circuit comprises a sensor 2 sensing current flowing between electromedical patient maintaining equipment and electrodes on a patient, means 5 converting this current to a direct voltage, a comparator 6 which generates a signal when this direct voltage exceeds a reference voltage and actuates a switch 3 via a trigger 7 to interrupt the circuit between the patient and the monitoring equipment. The sensor is a resistor, the means 5 converting the current to direct voltage comprises a filter and full-wave rectifier, and the comparator may be a differential amplifier. To prevent dangerous current flowing due to coupling with external circuits the protective circuit is powered by a battery 8. Further protection can be provided against excess or unbalanced currents in the battery leads by inserting sensors in these leads too, Fig. 2, not shown. An alarm circuit may be connected to the comparator 6 to indicate that a fault has occurred, Fig. 3, not shown, there being a further sensor or opto-electrical isolator in the alarm lead. A test circuit may be incorporated with the protective circuit so that correct working of the protective circuit can be checked, Fig. 4, not shown. In connection with this test circuit, the switch in the protective circuit may be a changeover switch which in the case where the sensor detects an overcurrent applies a calibration voltage to the electromedical monitoring equipment, Fig. 5, not shown. The switch in all embodiments may be arranged to reclose after a predetermined period of time, but will immediately reopen if the overcurrent is again sensed.