Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means – Monitors operational parameter
Patent
1993-05-27
1994-11-22
Peckman, Kristine L.
Elevator, industrial lift truck, or stationary lift for vehicle
With monitoring, signalling, and indicating means
Monitors operational parameter
B66B 144
Patent
active
053671325
ABSTRACT:
An improved centering control for an elevator horizontal suspension having at least one actuator and includes a circuit for disabling the control or braking the actuator in response to an error signal indicative of the difference between a reference signal and a sensed signal indicative of the degree of centering of the car. Of course, both braking and disabling may be carried out instead of just one. For those cases in which two actuators are acting in concert to center the car, where the control is responsive to the error signal for only selecting one of the opposed actuators at a time, a small centering window is set up about the centered condition and part of the window is used to disable or brake one of the actuators and another part to disable or brake the other of the actuators. Again, both disabling and braking operations may be carried out at the same time with respect to a given actuator. For a centering control in which opposed actuators are used with individual feedback control loops to achieve a preselected preload, the improved control only uses the feedback loop when the corresponding actuator is unselected for actuation.
REFERENCES:
patent: 4754849 (1988-07-01), Ando
patent: 5086882 (1992-02-01), Sugahara et al.
patent: 5117946 (1992-06-01), Traktovenko et al.
patent: 5193651 (1993-03-01), Shigeta et al.
patent: 5304751 (1994-04-01), Skalski et al.
Skalski Clement A.
Traktovenko Boris
Maguire, Jr. Francis J.
Nappi Robert
Otis Elevator Company
Peckman Kristine L.
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