US4808975A — Arrangement for checking and indicating the malfu…

Claim 1

Independent Claim 135 words

In an arrangement for monitoring and reporting a malfunctioning indicator lamp in control, switching safety and indicator systems, comprising an indicator lamp connected in a circuit to be monitored via a series resistor, and the series connection of a visual indicator and an electronic circuit, whose conduction is controlled in dependence on the operating state of said indicator lamp, connected in parallel with the bridging said indicator lamp; the improvement wherein: said electronic circuit is composed of a bi-directional voltage or temperature dependent semiconductor device or resistor which can handle reverse polarity voltages equally well in both directions; and said arrangement further comprises a protective diode connected in series with said visual indicator and said electronic circuit, and a coupling circuit means, connected in series with said visual indicator, for generating a galvanically decoupled signal.

Claim 2

Dependent Claim 135 words

In an arrangement for monitoring and reporting a malfunctioning indicator lamp in control, switching safety and indicator systems, comprising an indicator lamp connected in a circuit to be monitored via a series resistor, and the series connection of a visual indicator and an electronic circuit, whose conduction is controlled in dependence on the operating state of said indicator lamp, connected in parallel with the bridging said indicator lamp; the improvement wherein: said electronic circuit is composed of a bi-directional voltage or temperature dependent semiconductor device or resistor which can handle reverse polarity voltages equally well in both directions; and said arrangement further comprises a protective diode connected in series with said visual indicator and said electronic circuit, and a coupling circuit means, connected in series with said visual indicator, for generating a galvanically decoupled signal.

Claim 3

Dependent Claim 26 words

An arrangement as defined in claim 1, wherein said visual indicator comprises an incandescent bulb, a light emitting diode (LED), or an LED or LCD display.

Claim 4

Dependent Claim 103 words

In an arrangement for monitoring and reporting a malfunctioning indicator lamps in control, switching safety and indicator systems, comprising an indicator lamp connected in a circuit to be monitored via a series resistor, and the series connection of a visual indicator and an electronic circuit, whose conduction is controlled in dependence on the operating state of said indicator lamp, connected in parallel with the bridging said indicator lamp; the improvement comprising: coupling circuit means, responsive to the conductive state of said electronic circuit, for generating a galvanically decoupled electrical signal indicating the conductive state of said electronic circuit and of said visual indicator.

Claim 5

Dependent Claim 103 words

In an arrangement for monitoring and reporting a malfunctioning indicator lamps in control, switching safety and indicator systems, comprising an indicator lamp connected in a circuit to be monitored via a series resistor, and the series connection of a visual indicator and an electronic circuit, whose conduction is controlled in dependence on the operating state of said indicator lamp, connected in parallel with the bridging said indicator lamp; the improvement comprising: coupling circuit means, responsive to the conductive state of said electronic circuit, for generating a galvanically decoupled electrical signal indicating the conductive state of said electronic circuit and of said visual indicator.

Claim 6

Dependent Claim 20 words

An arrangement as defined in claim 3, wherein said coupling circuit means is connected in series with said visual indicator.

Claim 7

Dependent Claim 23 words

An arrangement as defined in claim 3, wherein said electronic circuit is composed of a voltage or temperature dependent semiconductor device or resistor.

Claim 8

Dependent Claim 23 words

An arrangement as defined in claim 5, further comprising a protective diode connected in series with said visual indicator and said electronic circuit.

Claim 9

Dependent Claim 41 words

An arrangement as defined in claim 3 wherein: said indicator lamp is mounted in a socket disposed on an insulating carrier; and said visual indicator is mounted adjacent said indicator lamp in a insulating tube which is secured to said carrier.

Claim 10

Dependent Claim 51 words

An arrangement as defined in claim 7 wherein: said lamp and said visual indicator are covered by a cap fastened to said carrier and having a diffusion screen on its inner surface; and said diffusion screen has a through bore onto which said visual indicator extends for holding same in place.

Claim 11

Dependent Claim 20 words

An arrangement as defined in claim 7 further comprising a housing attached to said carrier for accommodating said electronic circuit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-02-28	1992-08-29	1993-02-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-02-28	1996-08-29	1997-02-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-02-28	2000-08-29	2001-02-28	$7700.00	Window Closed / Lapsed

Arrangement for checking and indicating the malfunction of a lamp in monitoring and switching systems

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