Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means – Monitors operational parameter
Patent
1995-08-03
1998-09-22
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
With monitoring, signalling, and indicating means
Monitors operational parameter
187292, B66B 134, B66B 300
Patent
active
058117431
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a vibration control apparatus for an elevator.
BACKGROUND ART
FIG. 16 shows a passenger car of an ordinary elevator that is hoisted up or down along guide rails installed in an elevator passage of a high-rise building. The elevator passage 1 has sidewalls along which the guide rails 2 are vertically installed. The passenger car 4 is arranged between the guide rails 2 and is hoisted up or down by hoist cables 3. The passenger car 4 consists of a passenger car frame 5 and a passenger car chamber 6 supported by the passenger car frame 5. Four guide units 7 are arranged on the top and bottom of the passenger car frame 5. As shown in FIG. 17, the guide unit 7 has a guide base 8a fixed to the passenger car frame 5, a lever 8b having an end rotatably attached to the guide base 8a, a guide roller 8c rotatably attached to the other end of the lever 8b, a rod 8d having an end fixed to the guide base 8a, and a presser spring 8e arranged between the lever 8b and the rod 8d, to suppress a displacement of the guide roller 8c. The guide roller 8c is in contact with the side and end faces of the guide rail 2 and rolls along the guide rail 2.
As shown in FIG. 16, floor support frames 9 are laid on the bottom of the passenger car frame 5. Rubber dampers 10 are arranged between the floor support frames 9 and the bottom of the passenger car chamber 6, to support the passenger car chamber 6.
Curves and installation errors in the guide rails 2 and level differences at joints of the guide rails may vibrate the passenger car 4 of the conventional elevator. The vibration is transmitted to persons in the passenger car 4, to make them uncomfortable. The rubber dampers 10 absorb such vibration and improve comfortableness in riding the elevator.
The conventional elevator, however, is incapable of completely eliminating the vibration caused by the guide rails. Generally, vibration due to the guide rails increases as the running speed of the elevator increases. When the speed of the passenger car of the elevator exceeds a given value, vibration of the passenger car due to the guide rails exceeds an allowable range, to cause uncomfortableness. When the speed of the passenger car reaches a certain level, a vibration frequency due to forcible displacements by the curves in the guide rails agrees with the natural frequency of the passenger car, to cause a resonance. The resonance strongly vibrates the passenger car, to drastically deteriorate comfortableness in the passenger car.
DISCLOSURE OF INVENTION
To solve the problems of the prior art mentioned above, an object of this invention is to provide a vibration control apparatus for an elevator, for attenuating vibration of a passenger car of the elevator by forcibly displacing the passenger car in a direction to attenuate the vibration, or by employing a weight to produce inertial force to attenuate the vibration, thereby improving comfortableness in the passenger car.
In order to accomplish the object, the invention according to a first embodiment described in claim 1 provides a vibration control apparatus for an elevator having guide rails along an elevator passage and guide units on the top and bottom of a passenger car of the elevator. The guide unit has a rocking lever, a guide roller rotatably attached to the lever, and a spring to press the guide roller against the guide rail so that the guide roller may roll along the guide rail. The vibration control apparatus has an actuator made of a multilayer piezoelectric element disposed between the spring and guide roller of one of the guide units, to adjust a transverse displacement of the guide roller, a vibration sensor installed on the passenger car, to detect transverse vibration acceleration, and a controller for applying a voltage to the piezoelectric element to displace the actuator in a direction to cancel the transverse vibration acceleration of the passenger car detected by the vibration sensor.
The invention according to a second embodiment is based on the vibration control appara
REFERENCES:
patent: 5271133 (1993-12-01), Dam et al.
patent: 5281899 (1994-01-01), Culp
patent: 5294757 (1994-03-01), Skalski et al.
patent: 5368132 (1994-11-01), Howell et al.
Kazao Yukihiko
Kohara Hideya
Nakagaki Shigeo
Shudo Tadashi
Kabushiki Kaisha Toshiba
Nappi Robert
LandOfFree
Vibration control apparatus for elevator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vibration control apparatus for elevator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibration control apparatus for elevator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1624117