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Patent US3774728A successfully refreshed from Google Patents.
US3774728A
Expired / Lapsed
US
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Elevator call circuit
Assignee: Guardian Electric Manufacturing Co
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Filing: 1972-05-10
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Granted: 1973-11-27
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Expires: 1992-05-10
Abstract
Abstract A control system for elevators or the like wherein the elevator call button generates a first signal which is in turn sensed by the control circuit. The control circuit then provides a second signal of greater duration than the first. The second signal is utilized to produce energization of a relay which in turn controls the operation of the elevator motor and related equipment. A threshold device prevents operation of the relay when the first signal is below a threshold level so as to prevent accidental operation of the elevator by low level spurious signals. All of the control circuitry may be positioned remote from the signal generator in a safe environment. Additionally, short circuiting of the leads from the signal generator will not initiate operation of the elevator.
Inventors
- 👤 A Metzler
- 👤 W Wright
- 👤 J Rowell
- 👤 R Collette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:55
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/46; B66B1/468; B66B1/3415; B66B1/3446; B66B1/3453
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
124 words
An electrical elevator call control system which provides command output signals to a controlled device comprising, in combination, means for genErating a first signal, signal stretching means connected to said first signal generating means, said stretching means being responsive to said first signal generating means for generating a second signal having a duration greater than said first signal, a command relay means for providing an output signal to said controlled device, means connected to said relay and to said stretching means for energizing said relay in response to said second signal, and interlock means for said command relay means engageable upon energization of said command relay means to retain energization of said command relay and disengageable by feedback control means from said controlled device.
Claim 2
Dependent Claim
124 words
An electrical elevator call control system which provides command output signals to a controlled device comprising, in combination, means for genErating a first signal, signal stretching means connected to said first signal generating means, said stretching means being responsive to said first signal generating means for generating a second signal having a duration greater than said first signal, a command relay means for providing an output signal to said controlled device, means connected to said relay and to said stretching means for energizing said relay in response to said second signal, and interlock means for said command relay means engageable upon energization of said command relay means to retain energization of said command relay and disengageable by feedback control means from said controlled device.
Claim 3
Dependent Claim
42 words
The system as set forth in claim 1 including threshold means for preventing operation of said relay energizing means until said second signal exceeds a predetermined level such that spurious line signals below said predetermined level will not accidentally energize said relay.
Claim 4
Dependent Claim
48 words
The system of claim 1 wherein said signal stretching means includes an energy storage device having an input charging impedance and an output discharging impedance greater than said input charging impedance, said energy storage device being connected between said first signal generating means and said relay energizing means.
Claim 5
Dependent Claim
31 words
The system of claim 1 wherein said feedback control means comprise circuit breaker means in series with said relay, said circuit breaker means being operative in response to said controlled device.
Claim 6
Dependent Claim
12 words
The system of claim 1 wherein said components are direct current responsive.
Claim 7
Dependent Claim
23 words
The system of claim 1 including a plurality of said systems, each one of said systems being associated with a separate command station.
Claim 8
Dependent Claim
25 words
The system of claim 1 wherein said means for generating a first signal comprises a coil and means for inducing a voltage in said coil.
Claim 9
Dependent Claim
17 words
The system of claim 7 including a separate low amperage test circuit in parallel with said coil.
Claim 10
Dependent Claim
35 words
The system as set forth in claim 1 including means connected between said first and second signal generating means for shorting out high frequency spurious signals from the input to said first signal generator means.
Claim 11
Dependent Claim
124 words
An electrical elevator call control system which provides command output signals to a controlled device comprising, in combination, means for generating a first signal including an input, signal stretching means connected to said first signal generating means, said stretching means being responsive to said first signal generating means for generating a second signal having a duration greater than said first signal, means connected between said first and said second signal generating means for shorting out high frequency spurious signals from the input to said means for generating a first signal, a command relay means for providing an output signal to said controlled device, and means connected to said relay and to said stretching means for energizing said relay in response to said second signal.
Claim 12
Dependent Claim
124 words
An electrical elevator call control system which provides command output signals to a controlled device comprising, in combination, means for generating a first signal including an input, signal stretching means connected to said first signal generating means, said stretching means being responsive to said first signal generating means for generating a second signal having a duration greater than said first signal, means connected between said first and said second signal generating means for shorting out high frequency spurious signals from the input to said means for generating a first signal, a command relay means for providing an output signal to said controlled device, and means connected to said relay and to said stretching means for energizing said relay in response to said second signal.
Claim 13
Dependent Claim
42 words
The system as set forth in claim 10 including threshold means for preventing operation of said relay energizing means until said second signal exceeds a predetermined level such that spurious line signals below said predetermined level will not accidentally energize said relay.
Claim 14
Dependent Claim
48 words
The system of claim 10 wherein said signal stretching means includes an energy storage device having an input charging impedance and an output discharging impedance greater than said input charging impedance, said energy storage device being connected between said first signal generating means and said relay energizing means.
Claim 15
Dependent Claim
41 words
The system as set forth in claim 10 including interlock means for said command relay means engageable upon energization of said command relay means to retain energization of said command relay and disengageable by feedback control means from said controlled device.
Claim 16
Dependent Claim
31 words
The system of claim 13 wherein said feedback control means comprise circuit breaker means in seriEs with said relay, said circuit breaker means being operative in response to said controlled device.
Claim 17
Dependent Claim
12 words
The system of claim 10 wherein said components are direct current responsive.
Claim 18
Dependent Claim
23 words
The system of claim 10 including a plurality of said systems, each one of said systems being associated with a separate command station.
Claim 19
Dependent Claim
25 words
The system of claim 10 wherein said means for generating a first signal comprises a coil and means for inducing a voltage in said coil.
Claim 20
Dependent Claim
17 words
The system of claim 17 including a separate low amperage test circuit in parallel with said coil.
Claim 21
Dependent Claim
107 words
An electrical elevator call control system which provides command output signals to a controlled device comprising, in combination, means for generating a first signal, a low amperage test circuit in parallel with said means for generating a first signal, signal stretching means connected to said first signal generating means, said stretching means being responsive to said first signal generating means for generating a second signal having a duration greater than said first signal, a command relay means for providing an output signal to said controlled device, and means connected to said relay and to said stretching means for energizing said relay in response to said second signal.
Claim 22
Dependent Claim
107 words
An electrical elevator call control system which provides command output signals to a controlled device comprising, in combination, means for generating a first signal, a low amperage test circuit in parallel with said means for generating a first signal, signal stretching means connected to said first signal generating means, said stretching means being responsive to said first signal generating means for generating a second signal having a duration greater than said first signal, a command relay means for providing an output signal to said controlled device, and means connected to said relay and to said stretching means for energizing said relay in response to said second signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |