Preh Elektrofeinmechanische Werke Jakob Preh Nachf Gmbh & Co.

Preh-elektrofeinmechanische Werke - Jakob Preh Nachf

Preh, Electrofeinmechanische Werke, Jakob Preh Nachf Gmbh & Co.

Alfred Vogt

Anton Ruttiger

Bernd Veith

Hans-Joachim Viebrantz

Helmut Eberwein

Paul Greb

A housing for a hand-held remote control transmitter including a battery, electronic transmission circuit, and a transmission device, including a housing frame having at least one opening for receiving a battery or otherwise accessing the interior of the housing and a cutout for receiving a touch keypad wherein a sealing rim is provided extending into the housing frame surrounding the cutout and an elastic contact mat is compressed against the rim sealing the cutout opening. A cover part is provided for covering the opening and a gasket surrounding the periphery of the opening and of the cover part is compressed between the cover part and the housing frame. Each other opening providing the housing frame is also sealed thereby protecting the contents of housing from liquids and other environmental factors.

Housing for a hand-held remote control transmitter

A remote control transmitter for transmitting remote control signals which omprise an alternating sequence of two chronologically successive pulses having a first and a second frequency, respectively. The transmitter comprises a plurality of manually-operable command keys for supplying a command signal upon operation, an encoding circuit for supplying the command signal in logic form, a pulse generator having outputs which are the logic inverse of one another, a transmitting circuit for transmitting a signal dependent upon the logic signal supplied at its inputs, and a matrix of coupling points. Each coupling point is connected by a resistance element to a respective encoding circuit output, by a diode of predetermined polarity to a pulse generator output, and to a respective transmitting circuit input. The polarity of the diodes is such that during a first portion of the pulse generator period a predetermined logic command signal is supplied to the transmitting circuit, while during a second portion of the period the manually-selected command signal is supplied thereto.

Remote control transmitter

Apparatus for receiving remote control signals which comprise an alternat sequence of two chronologically successive pulses, the first pulse having a first predetermined frequency and the second pulse having a second frequency manually selected from a predetermined number of frequencies, each of the predetermined number of frequencies representing a command to be carried out. The receiver comprises a signal detector, a signal amplifier and a circuit for decoding the remote control signal into a group signal dependent on the first frequency and a command signal dependent on the second frequency. A controllable gate is provided for gating the command signal from the decoding circuit to a command signal register having a command signal input for each of the commands, and an input for blocking each command signal output. Means coupled to the command signal outputs implement the commands. A circuit responsive to the group signal controls the gate, while a circuit responsive to receipt of a command signal in the register causes the remaining command signal inputs to be locked.

Remote control receiver

An apparatus for remotely controlling one or more power units including a transmitter which produces an optical pulse train having a frequency varied by an astable multivibrator controlled by keys which connect different resistances into the astable circuit, and one or more receivers. Each receiver receives the optical pulses, converts them to electrical pulses, divides the frequency, counts the electrical pulses, provides an analog output from the counter and compares that analog output with a saw tooth periodic waveform to control circuit elements which in turn control conduction through the power unit.

Growing community of inventors

Salz, Germany

Alfred Vogt