US3662861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator control dispensing with traveling cables
Assignee: WHITESONS SALES CORP
•
Filing: 1969-08-14
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Granted: 1972-05-16
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Expires: 1989-08-14
Abstract
Abstract ''''Up slow,'''' ''''Down slow,'''' ''''Up Fast,'''' and ''''Down Fast'''' command signals in the form of magnetic flux from an elevator car are transmitted to a hoist motor at an end of the shaft, using ferromagnetic flux to magnetically couple a transmitter in the car and a receiver at the motor to a cable in the shaft or to a fixed structural member of the shaft either of which acts as the secondary of a transformer coupling the receiver to the transmitter. The transmitter-receiver system operates at low frequencies (between about 300 to 1,200 cycles/sec.) to avoid electromagnetic radiation and its signals are so coded as to insure unambiguous command signals immune to electrical noise, and to provide certain fail-safe features.
Inventors
- 👤 Gerome R White
- 👤 Arnold M Lawner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:19
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
148 words
In an elevator system including a car movable within a shaft, a hoist cable, and associated hoisting motor outside the car for moving the car within the shaft: transmitter means in the car for developing command signals for control of the hoisting motor, the signals being in a frequency range such that radiation is negligible; receiver means associated with the hoisting motor for receiving the command signals; a member coupled to the receiver means extending adjacent the car along the length of the path of the car within the shaft; transformer means movable along the member with the car for magnetically coupling the transmitter means to the member through ferro-magnetic flux linkage whereby the command signals may be transmitted from the transmitter means to the receiver means by low frequency magnetic transformer action; and means responsive to the receiver means and command signals for controlling the hoisting motor.
Claim 2
Dependent Claim
148 words
In an elevator system including a car movable within a shaft, a hoist cable, and associated hoisting motor outside the car for moving the car within the shaft: transmitter means in the car for developing command signals for control of the hoisting motor, the signals being in a frequency range such that radiation is negligible; receiver means associated with the hoisting motor for receiving the command signals; a member coupled to the receiver means extending adjacent the car along the length of the path of the car within the shaft; transformer means movable along the member with the car for magnetically coupling the transmitter means to the member through ferro-magnetic flux linkage whereby the command signals may be transmitted from the transmitter means to the receiver means by low frequency magnetic transformer action; and means responsive to the receiver means and command signals for controlling the hoisting motor.
Claim 3
Dependent Claim
54 words
A system as in claim 1 in which the member is a cable and the transformer means comprises: a magnetic core movable along the cable and affixed to the car; and a primary winding coupling the transmitter means to the core; the cable forming a secondary winding coupling the receiver means to the core.
Claim 4
Dependent Claim
14 words
A system as in claim 2 in which the cable is said hoist cable.
Claim 5
Dependent Claim
32 words
A system as in claim 3 including a drum for winding and unwinding the hoist cable, the receiver means being connected to the inner end of the hoist cable on the drum.
Claim 6
Dependent Claim
17 words
A system as in claim 1 in which the member is a structural member of the shaft.
Claim 7
Dependent Claim
50 words
A system as in claim 5 in which the transformer means comprises: a magnetic core movable along the structural member and affixed to the car; and a primary winding coupling the transmitter means to the core; the structural member forming a secondary winding coupling the receiver means to the core.
Claim 8
Dependent Claim
19 words
A system as in claim 1 in which the frequency range is frequencies below about 1,200 cycles per second.
Claim 9
Dependent Claim
83 words
A system as in claim 1 in which: the transmitter means includes means for generating GUARD ENABLE oscillations; means for generating ''''UP'''' command oscillations; means for generating ''''DOWN'''' command oscillations; the receiver means includes: means responsive to the GUARD ENABLE and UP command oscillations for producing an UP command signal; and means responsive to the GUARD ENABLE and DOWN command oscillations for producing a DOWN command signal; the means for controlling the hoist motor being responsive to said UP and DOWN cOmmand signals.
Claim 10
Dependent Claim
52 words
A system as in claim 8 in which: the transmitter means also includes: means for generating ''''FAST'''' command oscillations and the receiver means also includes: means responsive to the FAST command oscillations for producing a FAST command signal; the means for controlling the hoisting motor being responsive to said FAST command signal.
Claim 11
Dependent Claim
20 words
A system as in claim 8 including: means for ensuring that the UP and DOWN command signals cannot occur simultaneously.
Claim 12
Dependent Claim
24 words
A system as in claim 8 including: means for ensuring that neither UP or DOWN signals can occur in the absence of reference oscillations.
References Cited (Backward Citations)
US2930955A
Cited
US3203506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |