Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Reexamination Certificate
1998-12-22
2001-03-20
Salata, Jonathan (Department: 2837)
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
C187S256000
Reexamination Certificate
active
06202793
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to elevator machines and systems and, more particularly, to elevator machines and systems utilizing drive machines having counter-rotating rotors.
BACKGROUND AND SUMMARY OF THE INVENTION
High performance elevators require direct coupling between a motor and drive sheave in order to provide smooth, low vibration performance. The lack of a gearbox requires the machine to produce high torque at low operating speeds relative to industrial machines of the same power output rating. This results in motors that are large and expensive relative to industrial machines of the same power output.
The size and cost of conventional high-performance gearless machines makes it impractical to implement them in rope-climbing elevator designs, which are desirable for various reasons including optimization of hoistway space and convenient accessibility. Geared machines are undesirable for certain applications such as rope-climbing systems because they introduce vibrations and inefficiencies.
It is an object of the present invention to provide an elevator machine that includes the output and low vibration benefits of a high performance machine, while providing a lightweight and efficiency benefits of a gearless machine. This and other objects are achieved by the embodiments described herein.
The machine of the present invention utilizes a counter-rotating design that doubles the torque applied to lift an elevator for a given size motor, resulting in a motor that is approximately half the size of a motor used on a conventional, direct drive machine for the same duty. The use of counter-rotating drive sheaves eliminates reaction torque on the machine room floor, reducing structural requirements. This is due to the application of both the driving torque and the reaction torque to the elevator, compared to the application of the reaction torque to the machine room floor or other structure as with conventional machines. The machine is of sufficiently reduced size to be mounted on the counterweight and it eliminates reaction torque on the guide rails.
REFERENCES:
patent: 1071309 (1913-08-01), Goggin
patent: 1237321 (1917-08-01), Fraser
patent: 1750237 (1930-03-01), Mayer
patent: 3101130 (1963-08-01), Bianca
patent: 3127957 (1964-04-01), Nelson
patent: 3586938 (1971-06-01), LeGall
patent: 4375047 (1983-02-01), Nelson et al.
patent: 4502570 (1985-03-01), Westerlund
patent: 4755700 (1988-07-01), Yongning et al.
patent: 4949815 (1990-08-01), Pavoz
patent: 5429211 (1995-07-01), Aulanko et al.
patent: 5435417 (1995-07-01), Hakala
patent: 5469937 (1995-11-01), Hakala et al.
patent: 5490578 (1996-02-01), Aulanko et al.
patent: 5636712 (1997-06-01), Muller et al.
patent: 1 032 496 (1958-06-01), None
patent: 296 15 921 U1 (1997-04-01), None
patent: 0 606 875 A1 (1994-07-01), None
patent: 0 688 735 A2 (1995-12-01), None
patent: 0 710 618 A2 (1996-05-01), None
patent: 0 749 931 A2 (1996-12-01), None
patent: 0 779 233 A2 (1997-06-01), None
patent: 0 784 030 A2 (1997-07-01), None
patent: 0 749 930 A2 (1997-12-01), None
patent: 2 640 604 (1988-12-01), None
patent: 2 138 397 (1985-11-01), None
patent: 2 201 657 (1990-08-01), None
patent: 1-242386 (1989-09-01), None
patent: WO 96/09978 (1996-04-01), None
“Elevator Mechanical Design, Principles and Concepts”, by Lubomir Janovsky, Ellis Horwood Limited (1987).
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