US3687235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for an elevator car
Assignee: Hitachi Ltd
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Filing: 1971-01-21
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Granted: 1972-08-29
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Expires: 1991-01-21
Abstract
Abstract A control apparatus for an elevator car having an alternating current motor system comprising a high speed motor mechanically coupled with a low speed motor, wherein the high speed motor is used in accelerating and normal running and the low speed motor is excited by a direct current voltage upon separation of the high speed motor from its alternating current source to effect deceleration.
Inventors
- 👤 Nobuo Mitsui
- 👤 Takanobu Hatakeyama
- 👤 Katsu Komuro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28; B66B1/285; B66B1/30; B66B1/302; B66B1/308
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
In a control apparatus for an elevator car driven by a twospeed alternating current motor system including a high speed alternating current sub-system and a low speed alternating current sub-system and electromagnetic brake means associated with said motor system for effecting a braking of the movement of the car, the improvement comprising supply means foR controllably supplying a direct energizing current to said low speed subsystem of the motor system to effect deceleration by dynamic braking of said car, control means for controlling the direct current from said supply means according to the deviation between a particular positional speed pattern and the actual speed of the car during deceleration, and operating means responsive to the speed of the car for operating said electromagnetic brake means after the car is reduced to a prescribed speed by said control means and sufficiently approaches the target floor.
Claim 2
Dependent Claim
144 words
In a control apparatus for an elevator car driven by a twospeed alternating current motor system including a high speed alternating current sub-system and a low speed alternating current sub-system and electromagnetic brake means associated with said motor system for effecting a braking of the movement of the car, the improvement comprising supply means foR controllably supplying a direct energizing current to said low speed subsystem of the motor system to effect deceleration by dynamic braking of said car, control means for controlling the direct current from said supply means according to the deviation between a particular positional speed pattern and the actual speed of the car during deceleration, and operating means responsive to the speed of the car for operating said electromagnetic brake means after the car is reduced to a prescribed speed by said control means and sufficiently approaches the target floor.
Claim 3
Dependent Claim
27 words
A control apparatus for an elevator car according to claim 1, wherein the speed pattern has a particularly large deceleration in the initial part of the pattern.
Claim 4
Dependent Claim
107 words
A control apparatus for an elevator car according to claim 1, wherein said control means includes a first speed pattern generator providing a speed pattern having a predetermined deceleration from a maximum speed of the car at a deceleration starting point to a stop point of the target floor and a second speed pattern generator providing a larger deceleration than the predetermined deceleration from a point higher than the maximum speed at the deceleration starting point to the initial point of the pattern of said first speed pattern generator, the outputs of said first and second speed pattern generators being combined to produce a composite speed pattern.
Claim 5
Dependent Claim
72 words
A control apparatus for an elevator car according to claim 3, wherein said control means includes detecting means for detecting sequential positions located in spaced relationship prior to each floor at which said elevator may stop, said first speed pattern generator including means responsive to a request for deceleration of the elevator car for integrating the output of said detecting means as each sequential position is detected prior to a target floor.
Claim 6
Dependent Claim
32 words
A control apparatus for an elevator car according to claim 4, wherein said first speed pattern generator is non-responsive to the last output of said detecting means prior to a target floor.
Claim 7
Dependent Claim
86 words
A control apparatus as defined in claim 4 wherein said operating means includes relay means responsive to a service request signal for connecting an alternating current source to said motor system to initiate movement of said car and holding means for maintaining operation of said relay means during movement of said car above a prescribed speed, said relay means having normally closed contacts in the energization circuit of said electromagnetic brake means so that said electromagnetic brake means is de-energized during operation of said relay means.
Claim 8
Dependent Claim
55 words
A control apparatus as defined in claim 6 wherein said operating means further includes protection means responsive to a signal from said detecting means detecting passage of said car beyond one of said sequential positions for overriding said holding means so as to de-activate said relay means and permit operation of said electromagnetic brake means.
Claim 9
Dependent Claim
34 words
A control apparatus for an elevator car according to claim 3, wherein said second speed pattern generator includes a capacitor and means for initiating charging of said capacitor upon reaching a deceleration starting point.
Claim 10
Dependent Claim
42 words
A control apparatus for an elevator car according to claim 3, wherein said control means includes means for reducing said composite speed pattern to zero at a point which is a predetermined distance prior to the stopping point at the target floor.
Claim 11
Dependent Claim
84 words
A control apparatus for an elevator car according to claim 1, wherein said control means includes a voltage regulator connected between said supply means and said low speed sub-system, a phase shifter connected in control of said voltage regulator, a comparator having an output connected to said phase shifter, first and second pattern generators connected together to one input of said comparator, and a speed detecting generator connected to said motor system and having an output connected to a second input of said comparator.
Claim 12
Dependent Claim
41 words
A control apparatus for an eLevator car according to claim 10, wherein said control means includes means for reducing said speed pattern to zero at a point which is a predetermined distance prior to the stopping point at the target floor.
Claim 13
Dependent Claim
56 words
A control apparatus for an elevator car according to claim 10, wherein said control means includes a current detector connected between said supply means and said voltage regulator for detecting operation of said control means to initiate said dynamic braking, said current detecting means effecting operation of said means for reducing said speed pattern to zero.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |