US4376471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency apparatus for elevator
Assignee: Mitsubishi Electric Corp
•
Filing: 1981-01-21
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Granted: 1983-03-15
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Expires: 2001-01-21
Abstract
Abstract An emergency apparatus for elevator which converts a DC power into an AC power by an inverter device in an emergency state to feed the AC power to an AC traction motor and an AC motor for door-opening and closing which have different rated voltages so as to drive a cage of the elevator and to open and close a door of the cage comprises selectively feeding a power through said inverter device to either of said traction motor or said motor for door-opening and closing, in an emergency state.
Inventors
- 👤 Hideo Uchino
- 👤 Masami Nomura
- 👤 Takaaki Aoi
- 👤 Masumi Kanbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:38
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875; B; B66; B66B; B66B13/00; B66B13/02; B66B13/14; B66B13/143; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
In an emergency apparatus for operating an elevator which converts a DC power into an AC power by an inverter device in an emergency state to feed the AC power to an AC traction motor and AC motor for door-opening and closing with each of said motors having different rated voltages so as to drive a cage of the elevator and to open and close a door of the cage, an improvement which comprises: means for selectively feeding a power through said inverter device to either of said traction motor or said motor for door-opening and closing, in an emergency state; and an oscillation circuit for varying the frequency of the output of said inverter device in the feeding of the AC power.
Claim 2
Dependent Claim
123 words
In an emergency apparatus for operating an elevator which converts a DC power into an AC power by an inverter device in an emergency state to feed the AC power to an AC traction motor and AC motor for door-opening and closing with each of said motors having different rated voltages so as to drive a cage of the elevator and to open and close a door of the cage, an improvement which comprises: means for selectively feeding a power through said inverter device to either of said traction motor or said motor for door-opening and closing, in an emergency state; and an oscillation circuit for varying the frequency of the output of said inverter device in the feeding of the AC power.
Claim 3
Dependent Claim
71 words
The emergency apparatus for elevator according to claim 1 wherein said oscillation circuit comprises a first oscillation circuit which oscillates in a first frequency; a second oscillation circuit which oscillates in a second frequency; and a logical circuit which inputs the outputs of said first and second oscillation circuits and a driving command signal which commands the driving of either of said traction motor or said motor for door-opening and closing.
Claim 4
Dependent Claim
23 words
The emergency apparatus for elevator according to claim 2 wherein said inverter device has a structure for outputting a three phase AC power.
Claim 5
Dependent Claim
35 words
The emergency apparatus for elevator according to claim 3 wherein said inverter device is turned on through a turn-on circuit so as to give both directions of phase rotation of the three phase AC output.
Claim 6
Dependent Claim
57 words
The emergency apparatus for elevator according to claim 4 wherein said turn-on circuit inputs the phase rotation command signal and the clock signal of said oscillation circuit and said turn-on circuit comprises a counter having figures corresponding to number of arms of said inverter device and a logical circuit connected to said counter in the output side.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |