Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes linking support cable in drive-means
Reexamination Certificate
1999-07-13
2001-05-15
Olszewski, Robert P. (Department: 3652)
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes linking support cable in drive-means
C187S350000, C254S343000, C254S362000
Reexamination Certificate
active
06230844
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rope traction elevator with an elevator drive, and comprises a gear with a traction sheave, a motor, a brake, and suspension elements which pass over the traction sheave to provide vertical motion to an elevator car, preferably with a counterweight. The motor of the elevator drive is in an upright position.
2. Discussion of the Prior Art
An elevator drive of the type mentioned is known from German reference DE 37 37 773 C2. The purpose of this construction is to make it easy to assemble the gear, and to permit rapid mounting and dismounting of the motor, while keeping the bearings aligned during the process. The motor, which is in an upright position on top of the gear, has a drum brake at its upper end.
With today's high level of thermal load on motor windings, the occurrence of a fault in the windings due to an overload appears to be more probable than a mechanical defect in the gear. If a defective motor has to be replaced, the brake on top of the motor also has to be removed together with the defective motor. A prerequisite for this operation is that the car and counterweight must first be secured against unbraked movement, for example by applying clamps to the ropes and/or supporting the counterweight in the hoistway. This procedure is time-consuming and carries the risk of accidents.
The German utility model 1 918 376 discloses an elevator drive consisting of a worm gear and a motor which is also in an upright position, but in which the motor is an external rotor motor and whose cylindrical external surface simultaneously serves as a brake drum. With this drive the brake also has to be removed when the motor is replaced, which gives rise to the same disadvantageous effect as already described above. Furthermore, the large gyrating mass resulting from the external rotor principle can have a negative effect on the acceleration and deceleration of the elevator car.
In both of the drives mentioned, the small size of the motors in relation to the size of the gear leads to the conclusion that these drives are designed only for relatively low power output. If a motor for the medium power range is used which has a higher power output and is therefore larger, the horizontal dimensions of the motor may be greater than those of the gear base, which has negative consequences for the range of possible layouts.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to create an elevator drive whose motor and gear cases have narrow dimensions, i.e. in at least one horizontal dimension they are narrow enough for the drive to be located in the side of the hoistway in such a manner as to save space, but at the same time using a normal shape of motor. Moreover, it must be possible to replace the motor rapidly and easily without the disadvantages mentioned above.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in the elevator drive, including the upright motor attached to it, being slightly tilted so that a vertical projection of the motor from above lies within the horizontal boundary of the gear. Another object is to achieve this without complex structural modifications.
The inclination of the axis of the motor and gear is achieved by the mounting feet of the gear being in an inclined plane relative to the base of the gear.
The mechanical brake is positioned between the motor and the gear and does not have to be removed if the motor is replaced. As a result, movement of the drive and traction sheave after the motor has been removed is prevented by the closed brake, and no additional measures are needed to hold the elevator in position.
The mechanical brake is constructed as an integral part of the gear and is contained in a part of the gear case. The part of the gear case containing the brake is constructed as a flange collar, which faces upwards and has a flange plate to receive the motor, and which together with the lower part of the gear is constructed as a single-piece casting.
The vertical cross-section of the gear case, which optimally is oval in shape for high strength and rigidity, whose curves are constructed from several different radii, and whose height is greater than its width, makes it possible for the gear case to have thin walls and compact dimensions in the horizontal direction.
By positioning a flywheel above the motor it is possible to use a flywheel which projects beyond the cross-section of the motor case without exceeding the dimensions available for installation.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matted in which there are illustrated and described preferred embodiments of the invention.
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Chin Paul T.
Cohen & Pontani, Lieberman & Pavane
Inventio AG
Olszewski Robert P.
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