K.a. Schmersal Gmbh & Co.

K.a. Schmersal Holding Kg

K.a. Schmersal Holding Gmbh & Co Kg

Hermann Friedrich Hoepken

Helmut Letzel

Christoph Stratmann

Klaus Schulze

Udo Kienapfel

Christian Uhlenbrock

Manfred Eichenauer

Herbert Recke

The invention relates to a position monitoring device for establishing the position of a first part with respect to a second part, having a transceiver at the first part for emitting an interrogation signal and for receiving a response signal that can be emitted in reaction to the interrogation signal by a transponder, wherein a screen that attenuates signals between the transponder and the transceiver is provided, two members of the group consisting of the transceiver, the screen and the transponder being movable relative to one another.

Position monitoring device

A device with a safety circuit with an armature activated by a solenoid activates an electromagnet. The device has a switch connected in series to the solenoid, a device temporarily interrupting application of the voltage, first and second clock generators, first and second resistors, and a current detection switch. DC voltage is applied to the solenoid when the switch is closed. The voltage is interrupted when a predetermined current flowing through the solenoid is detected. The first clock generator actuates the switch during a predetermined first clock cycle. The detection switch detects current flowing through the solenoid. The first resistor, in conjunction with the response threshold of the current detection switch, determines the holding current for the armature. The second resistor generates an attraction current for the armature when activated by the second clock generator in a predetermined second clock cycle partially overlapping the first clock cycle.

Device for actuating an electromagnet

An apparatus for detecting the position of an object moveable along a predetermined travel path. The apparatus includes an acoustic signal waveguide, a signal input coupler, at least one signal output coupler, and means for generating. The acoustic signal waveguide extends along the travel path and having a predetermined, uniform speed of propagation of sound. The signal input coupler is located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide. The at least one signal output coupler is arranged at one end of the acoustic signal waveguide and is connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path. The means for generating acoustic signal adjacent pulses having a varying time interval is in communication with said signal input coupler.

Apparatus for detecting position

The operability of a plurality of sensors is monitored by periodically interrogating the sensors individually and evaluating the responses to the interrogation. The sensors are each connected to a two-conductor power supply bus via a signal processor and an interface. The information exchanged via the bus is in the form of binary coded signals generated by clocking the bus voltage.

Monitoring system and technique

The position of an object which is moved along a prescribed path, for example an elevator cage, is continuously and accurately monitored by coupling an acoustic signal generator carried by the object to an acoustic signal conductor which extends along the path, the acoustic signal conductor being characterized by the velocity of sound propagation therealong being uniform and constant. The position of the object is calculated by processing signals generated by transducers located at the opposite ends of the acoustic signal conductor, the signal processing determining the delay between receipt of a sound signal originating at the object at the opposite ends of the conductor.

Growing community of inventors

Sprockhovel, Germany

Hermann Friedrich Hoepken