Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1974-04-29
1976-06-08
Schaefer, Robert K.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 502
Patent
active
039616886
ABSTRACT:
A transportation system such as an elevator utilizes a static power converter to directly energize a D.C. drive motor and another static power converter to directly energize a friction type braking element and automatically selects a mode of operation best suited for safe operation from a plurality of modes including a normal operation, a reduced speed operation, an emergency landing operation and an emergency operation in response to certain sensed malfunctions within the system including a decrease in the source voltage to a predetermined magnitude, an increase in the armature current of the D.C. motor to a predetermined magnitude, a decrease in the field current of the D.C. motor below a predetermined magnitude, an increase of an error signal as sensed by an error detector to a predetermined magnitude, a malfunctioning of the error detector, an increase in the velocity of the vehicle as sensed by a velocity detector exceeding certain predetermined magnitudes, the malfunctioning of the velocity detector, a decrease in the source current to a predetermined magnitude, a loss of a phase of source energy as sensed by a phase detector, a failure of a rectifying element within the phase detector, an improper sequential order of the source alternating phases, a predetermined temperature within a gated rectifying circuit, an improper electrical connection by a circuit connector, and the movement of the vehicle to a first position adjacent to a landing at which a stop is being made and a subsequent movement to second position. The system responds to a sensed malfunction by providing a plurality of redundant sequences and fail-safe circuits in selecting the mode best suited for safe operation.
REFERENCES:
patent: 3584706 (1971-06-01), Hall et al.
patent: 3587785 (1971-06-01), Krauer et al.
patent: 3720292 (1973-03-01), Magee
patent: 3741348 (1973-06-01), Caputo
patent: 3779346 (1973-12-01), Winkler
Armor Elevator Company
Duncanson Jr. W. E.
Schaefer Robert K.
LandOfFree
Transportation system with malfunction monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transportation system with malfunction monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transportation system with malfunction monitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1093760