Positive non-interfering transmitter

Claim 2

In a transmission system having a control unit and a plurality of transmitters connected in parallel to a power loop from said control unit, the improvement wherein said transmitters are normally limited to unilateral conductivity in the same direction and each has starter means for actuation thereof, means in each transmitter for allowing reverse polarity operation thereof in response to actuation of said starter means, and means for reversing the polarity of said power loop responsive to actuation of any one of said transmitters.

Claim 3

The transmission system of claim 1 wherein a signal line is provided separate from said power loop, and normally open contacts in said signal line are associated with each transmitter, and means for closing said contacts in response to actuation of an associated transmitter.

Claim 4

A positive non-interfering transmitting circuit comprising a control unit, a power loop from said control unit, a plurality of diodes each arranged in parallel in said power loop, signal sending means associated with each of said diodes, normally open starter switch means between each diode and its associated signal sending means, normally open shunt means around each diode and its associated switch means, a polarity reversal relay associated with said control unit and operative to reverse polarity of said power loop upon closing of any of said starter switch means, and means for closing said shunt means in one transmitter in response to closing of associated starter switch means.

Claim 5

A positive non-interfering transmitting circuit comprising a control unit, a power loop from said control unit, a plurality of diodes each arranged in parallel in said power loop, signal sending means associated with each of said diodes, normally open starter switch means between each diode and its associated signal sending means, normally open shunt means around each diode and its associated switch means, a polarity reversal relay associated with said control unit and operative to reverse polarity of said power loop upon closing of any of said starter switch means, and means for closing said shunt means in one transmitter in response to closing of associated starter switch means.

Claim 6

The circuit of claim 3 wherein said signal sending means comprises a signal line separate from said power loop, a DC motor connected between said starter contacts and said loop, and normally open signal contacts associated with each diode location between said power loop and said signal line, said motor being operative to open and close said signal contacts.

Claim 7

The circuit of claim 4 wherein rectifier means is associated with said motor for causing the flow of current through the motor to Be unidirectional irrespective of polarity reversal in said power loop.

Claim 8

The circuit of claim 4 wherein normally closed series contacts in the power loop are associated with said motor so as to be opened thereby.

Claim 9

The circuit of claim 6 wherein said motor is operable to sequentially open said series contacts, close said shunt means and close said signal contacts.

Claim 10

A positive non-interfering transmitting circuit comprising a control unit, a power loop from said control unit, a separate signal line coextensive with a portion of said loop, a plurality of transmitters arranged in parallel between said loop, each station comprising a diode having its anode connected to the positive side of said loop, normally open signal contacts associated with each transmitter between said signal line and the negative side of said loop, normally open starter switch means on the cathode side of said diode, normally open shunt means around said diode and and said starter switch means, means between said starter switch means and the negative side of said loop for closing said shunt means and said signal contacts in response to closing of said starter switch means, and means for reversing the polarity of said power loop responsive to closing of said starter switch means.

Claim 11

A positive non-interfering transmitting circuit comprising a control unit, a power loop from said control unit, a separate signal line coextensive with a portion of said loop, a plurality of transmitters arranged in parallel between said loop, each station comprising a diode having its anode connected to the positive side of said loop, normally open signal contacts associated with each transmitter between said signal line and the negative side of said loop, normally open starter switch means on the cathode side of said diode, normally open shunt means around said diode and and said starter switch means, means between said starter switch means and the negative side of said loop for closing said shunt means and said signal contacts in response to closing of said starter switch means, and means for reversing the polarity of said power loop responsive to closing of said starter switch means.