US4056759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving system for moving paths or escalators
Assignee: Hitachi Ltd
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Filing: 1974-06-03
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Granted: 1977-11-01
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Expires: 1994-06-03
Abstract
Abstract A driving system for moving paths or escalators which use an endles chain adapted to be circulated between a path for transporting passengers, comprising a first and a second sprocket disposed at one end portion and substantially middle portion of the path, respectively, a first and a second induction motor coupled respectively to the first and second sprockets and each having the same rating output the sum of which is selected to be substantially equal to a maximum capacity of the system, an induction coupling interposed between the second sprocket and the second induction motor, means for detecting a current flow through the first induction motor, means for setting a reference value, and a thyristor amplifier for exciting the induction coupling in response to an excess developed when an output of the detecting means exceeds the reference value.
Inventors
- 👤 Nobuo Mitsui
- 👤 Akinori Watanabe
- 👤 Takeshi Oohira
- 👤 Kazuhiko Kawauchi
- 👤 Shoichi Nakao
- 👤 Katsuya Teranishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:08
CPC Classifications
B; B65; B65G; B65G23/00; B65G23/32; B65G23/36; B66; B66B; B66B23/00; B66B23/02; H; H02; H02P; H02P29/00; H02P29/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A driving system for moving paths or escalators which use an endless chain adapted to be circulated between a path for transporting passengers, comprising: a first and a second sprocket disposed at one end portion and substantially middle portion of said path, respectively; a first motor for driving said first sprocket; a second motor for driving said second sprocket; means for detecting a quantity corresponding to a loaded weight acting upon said endless chain; means for setting a reference value; and means for controlling a torque to be applied upon said second sprocket in response to an output from said detecting means, said torque controlling means including means for increasing the torque to be applied upon said second sprocket in response to an excess developed when the output of said detecting means exceeds said reference value.
Claim 2
Dependent Claim
136 words
A driving system for moving paths or escalators which use an endless chain adapted to be circulated between a path for transporting passengers, comprising: a first and a second sprocket disposed at one end portion and substantially middle portion of said path, respectively; a first motor for driving said first sprocket; a second motor for driving said second sprocket; means for detecting a quantity corresponding to a loaded weight acting upon said endless chain; means for setting a reference value; and means for controlling a torque to be applied upon said second sprocket in response to an output from said detecting means, said torque controlling means including means for increasing the torque to be applied upon said second sprocket in response to an excess developed when the output of said detecting means exceeds said reference value.
Claim 3
Dependent Claim
32 words
The driving system according to claim 1 wherein a sum of rating outputs of said first and second motors is selected to be substantially equal to the maximum capacity of the system.
Claim 4
Dependent Claim
27 words
The driving system according to claim 2 wherein the respective rating outputs of said first and second motors are selected to be substantially equal to each other.
Claim 5
Dependent Claim
35 words
The driving system according to claim 1 wherein said means for detecting a quantity corresponding to a loaded weight acting upon said endless chain includes means for detecting a current flow through said first motor.
Claim 6
Dependent Claim
34 words
The driving system according to claim 1 wherein said means for controlling the torque to be applied upon said second sprocket includes an induction coupling interposed between said second motor and said second sprocket.
Claim 7
Dependent Claim
52 words
The driving system according to claim 1, wherein said second motor comprises an induction motor and said means for controlling the torque to be applied upon said second sprocket includes thyristor means interposed between an AC source and said induction motor for regulating a voltage to be applied to said induction motor.
Claim 8
Dependent Claim
29 words
The driving system according to claim 1, wherein only a single torque controlling means is provided, said single torque controlling means controlling the torque applied to the second sprocket.
Claim 9
Dependent Claim
66 words
The driving system according to claim 1, wherein said means for setting a reference value provides a value such that for a predetermined portion of the load weight range acting upon said endless chain said torque controlling means provides 0 torque for said second motor, said torque controlling means providing an increasing torque in response to the output from said detecting means exceeding said reference value.
Claim 10
Dependent Claim
122 words
A driving system for moving paths or escalators which use an endless chain adapted to be circulated between a path for transporting passengers, comprising: a first and a second sprocket disposed at one end portion and substantially middle portion of said path, respectively; a first induction motor coupled to said first sprocket; a second induction motor coupled to said second sprocket through an induction coupling; means for detecting a current flow through said first induction motor; means for setting a reference value; means for comparing an output of said detecting means with said reference value; and a thyristor amplifier for exciting said induction coupling in response to an excess developed when the output of said detecting means exceeds said set reference value.
Claim 11
Dependent Claim
122 words
A driving system for moving paths or escalators which use an endless chain adapted to be circulated between a path for transporting passengers, comprising: a first and a second sprocket disposed at one end portion and substantially middle portion of said path, respectively; a first induction motor coupled to said first sprocket; a second induction motor coupled to said second sprocket through an induction coupling; means for detecting a current flow through said first induction motor; means for setting a reference value; means for comparing an output of said detecting means with said reference value; and a thyristor amplifier for exciting said induction coupling in response to an excess developed when the output of said detecting means exceeds said set reference value.
Claim 12
Dependent Claim
32 words
The driving system according to claim 9, wherein only a single induction coupling is provided, said single induction coupling controlling the output of said second induction motor supplied to said second sprocket.
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |