Control system for an alarm installation having a remote transmitter with a remotely controlled emergency device

Claim 2

A control system for an alarm installation equipped with a receiver adapted to be connected to a power supply and having alarm relay means, and a remote transmitter connected through lead wires to said receiver, said transmitter having a sensing element for detecting an abnormal condition and a switching element to actuate said alarm relay means in said receiver by connecting said lead wires, wherein the improvement comprises: said receiver including a self-holding alarm relay contact responsive to actuation of said alarm relay means to connect said lead wires and means for selectively introducing a control voltage and a different reset voltage into said lead wires, and said transmitter including a controlled device and a memory switch serially connected between said lead wires, a latching relay responsive to detection by said sensing element for closing said memory switch to connect said controlled device between said lead wires to receive said control voltage when introduced, said latching relay holding said memory switch closed until said reset voltage is introduced by said receiver, said control voltage operating said controlled device without opening said memory switch.

Claim 3

The control system of claim 1, further comprising an indicator lamp which serves as said controlled device.

Claim 4

The control system of claim 1, further comprising a slow releasing relay having a contact to control an emergency device which serves as said controlled device.

Claim 5

A control system utilizing an alarm installation, comprising a receiver adapted to be connected to a power supply and having alarm relay means; a sensing element located remotely from said receiver for detecting an abnormal condition; two lead wires connecting said sensing element to said receiver; and a transmitter which has a thyristor responsive to said sensing element to connect said lead wires to drive said alarm relay means; said receiver having a self-holding alarm relay contact responsive to said alarm relay means for de-energizing said lead wires and said receiver having means to introduce into said lead wires a pulse control voltage consisting of alternately repeated on and off periods and also to introduce a reset voltage, the on period of which is longer than that of said pulse control voltage, said transmitter having a capacitor which is connected in series with said thyristor to cut off said thyristor after being chargeD, a discharge resistor which is connected in parallel with said capacitor, a slow-releasing relay which controls an emergency device, and a memory contact which closes when said thyristor is driven into the conductive state by said sensing element for connecting said slow releasing relay to said lead wires until said reset voltage is applied.

Claim 6

A control system utilizing an alarm installation, comprising a receiver adapted to be connected to a power supply and having alarm relay means; a sensing element located remotely from said receiver for detecting an abnormal condition; two lead wires connecting said sensing element to said receiver; and a transmitter which has a thyristor responsive to said sensing element to connect said lead wires to drive said alarm relay means; said receiver having a self-holding alarm relay contact responsive to said alarm relay means for de-energizing said lead wires and said receiver having means to introduce into said lead wires a pulse control voltage consisting of alternately repeated on and off periods and also to introduce a reset voltage, the on period of which is longer than that of said pulse control voltage, said transmitter having a capacitor which is connected in series with said thyristor to cut off said thyristor after being chargeD, a discharge resistor which is connected in parallel with said capacitor, a slow-releasing relay which controls an emergency device, and a memory contact which closes when said thyristor is driven into the conductive state by said sensing element for connecting said slow releasing relay to said lead wires until said reset voltage is applied.

Claim 7

The control system of claim 4, wherein said transmitter has a latching relay with a setting coil, a resetting coil and a contact serving as said memory contact, said set coil closing said memory contact when said set coil is energized by the discharge current of said capacitor when said lead wires are connected by said thyristor, another thyristor interconnecting said memory contact and said resetting coil with said lead wires, said resetting coil being energized to open said memory contact when said other thyristor is driven into the on state, and a trigger capacitor for driving said other thyristor above a predetermined level by said reset voltage.

Claim 8

The control system of claim 4, wherein said means of introducing said pulsed control voltage and said reset voltage includes a control relay with a coil and a relay contact for cutting out a certain section of said lead wires and connecting the power supply to the cut-out section, an oscillator for supplying control voltage to said control relay coil, a control switch for operating said oscillator, a reset capacitor for supplying reset voltage to said control relay coil, and reset switch means for charging said reset capacitor.

Claim 9

A control system for selectively energizing a controlled device through an alarm installation, comprising a receiver having alarm relay means, a remote transmitter having a detector for producing an alarm signal indicative of an abnormal condition and switch means responsive to said alarm signal, an electrical circuit between said transmitter and receiver interconnecting said alarm relay means and said switch means, said switch means closing said circuit in response to said alarm signal to energize said alarm relay means, said transmitter having a memory switch for interconnecting the controlled device to said circuit in response to said alarm signal, said receiver having means responsive to said alarm signal for de-energizing said circuit without deactivating said alarm relay means to prevent said alarm signal from directly activating said controlled device, and said receiver having means for selectively energizing and de-energizing said controlled device via said circuit and said memory switch.

Claim 10

A control system for selectively energizing a controlled device through an alarm installation, comprising a receiver having alarm relay means, a remote transmitter having a detector for producing an alarm signal indicative of an abnormal condition and switch means responsive to said alarm signal, an electrical circuit between said transmitter and receiver interconnecting said alarm relay means and said switch means, said switch means closing said circuit in response to said alarm signal to energize said alarm relay means, said transmitter having a memory switch for interconnecting the controlled device to said circuit in response to said alarm signal, said receiver having means responsive to said alarm signal for de-energizing said circuit without deactivating said alarm relay means to prevent said alarm signal from directly activating said controlled device, and said receiver having means for selectively energizing and de-energizing said controlled device via said circuit and said memory switch.

Claim 11

The system of claim 7, wherein said means for energizing and de-energizing said controlled device produces in said circuit a first pulse voltage having a regular on period to activate said controlled device.

Claim 12

The system of claim 8, further comprising slow release relay means for interconnecting said memory switch means and the controlled device such that the controlled device is continuously activated by said first pulse voltage.

Claim 13

The system of claim 8, wherein said energizing and de-energizing means produces in said circuit a second pulse voltage having an on period longer than that of said first pulse voltage, said receiver having means nonresponsive to said first pulse voltage for reopening said memory switch in response to said second pulse voltage to turn off the controlled device.

Claim 14

A control system for an alarm installation, comprising a receiver with a self-holding alarm relay, a remote transmitter with a controlled device and means for generating an alarm signal, electrical lead wires interconnecting said receiver and transmitter, said transmitter having means responsive to said alarm signal for operatively connecting said lead wires to activate said alarm relay in said receiver, said transmitter having latching relay switch means responsive to said alarm signal for simultaneously connecting said controlled device in circuit with said lead wires, said latching relay switch means being resettable to disconnect said controlled Device in response to a reset voltage pulse of predetermined minimum duration, means in said receiver responsive to said alarm relay for simultaneously de-energizing said lead wires, said receiver having means for generating said reset voltage pulse, and said receiver having means for introducing on said lead wires an intermittent regularly repeating pulsed control voltage having an on period less than said predetermined minimum duration for said reset voltage pulse to operate said controlled device on command.

Claim 15

A control system for an alarm installation, comprising a receiver with a self-holding alarm relay, a remote transmitter with a controlled device and means for generating an alarm signal, electrical lead wires interconnecting said receiver and transmitter, said transmitter having means responsive to said alarm signal for operatively connecting said lead wires to activate said alarm relay in said receiver, said transmitter having latching relay switch means responsive to said alarm signal for simultaneously connecting said controlled device in circuit with said lead wires, said latching relay switch means being resettable to disconnect said controlled Device in response to a reset voltage pulse of predetermined minimum duration, means in said receiver responsive to said alarm relay for simultaneously de-energizing said lead wires, said receiver having means for generating said reset voltage pulse, and said receiver having means for introducing on said lead wires an intermittent regularly repeating pulsed control voltage having an on period less than said predetermined minimum duration for said reset voltage pulse to operate said controlled device on command.

Claim 16

The control system of claim 11, wherein said controlled device includes a slow-releasing relay connected in circuit with said lead wires by said latching relay switch means and an emergency device operatively connected to said slow-releasing relay such that said pulsed control voltage is of sufficiently short period to keep said emergency device continuously energized via said slow-releasing relay without resetting said latching relay switch means.