Patents Examined by Lawrence Colbert
  • Patent number: 5196656
    Abstract: An elevator door control apparatus includes an alternating current motor for opening and closing an elevator door. An inverter for converts a DC voltage from a first DC power supply into an AC voltage and supplies it to the motor. A first switching device for connects and disconnects the inverter and the motor, and a second switching device connects and disconnects a second DC power supply and the motor. A detection device detects at least one of an abnormality of the first DC power supply and an abnormality of the motor. A control device, at normal times supplies an AC voltage from the inverter to the motor by means of the first switching device and cuts off a DC voltage from the second DC power supply to the motor by means of the second switching device.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: March 23, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masamoto Mizuno, Terumi Hirabayashi, Masanori Tawada, Toshiyuki Kodera
  • Patent number: 5099957
    Abstract: A procedure and apparatus for controlling a hydraulic elevator during approach to a landing are disclosed, in which the speed of the elevator and the temperature of the hydraulic fluid are measured prior to beginning deceleration of the elevator. The deceleration point is adjusted on the basis of the speed and temperature information. The elevator passes a deceleration flag while approaching a landing, which is used to measure the speed of the elevator, and to provide a reference point from which the location of the deceleration point is determined. At temperatures exceeding a given reference temperature, the normal deceleration point is shifted from the leading edge of the deceleration flag to its trailing edge, and the start of actual deceleration of the elevator is delayed in relation to the deceleration point (trailing edge of the deceleration flag) by an amount depending on the elevator speed and oil temperature.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: March 31, 1992
    Assignee: Kone Elevator GmbH
    Inventor: Arvid Eriksson
  • Patent number: 5085294
    Abstract: An elevator control apparatus comprises drive device for driving an elevator car and a pulse generator, which is connected to the drive device and which generates pulses, the number of which are proportional to the travel distance of the car. The apparatus also comprises computing device for present car position for computing the present position of the car by counting the number of pulses from the pulse generator, computing device for predicted stop position for computing a predicted stop position of the car in case of a power failure during the travel of the car, first memory for storing data of the predicted stop position of the car and for maintaining that data, and second memory for previously storing position data of each floor in relation to an elevator.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: February 4, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Shigemi Iwata