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AssigneeDelaware Capital Formation, Inc.
InventorsOscar Gilliland, Foad Vafaie, Martin W. Hughes, Charlie R. Thurmond, III, Paul Tomes
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A twin post, telescoping jack hydraulic elevator system has a pair of dynamic sensors to determine when the jacks are out of synchronization, by determining any relative differences in height between the two intermediate cylinders. The elevator also includes static sensors to determine if one or both intermediate cylinders are more than a predetermined distance away from their normal positions when the car is stopped at each floor. The controller actuates a resynchronization if the distance between the intermediate jacks exceeds a first threshold, and shuts down the elevator if the distance exceeds a second threshold or if resynchronization demands are issued too often. Preferably, the static sensors are positioned to detect the seal housing at the top of the intermediate cylinder, which projects outwardly from the cylinder.
In a hydraulic elevator system having a car moveable in a shaft between at least two floors, a pair of telescoping jacks for supporting said car at spaced locations and for raising and lowering said car between floors, wherein each telescoping jack has a first cylinder coupled to the car, a second cylinder fixed relative to the ground, and at least one intermediate cylinder, the improvement comprising sensing means located at least one predetermined vertical position in said shaft for detecting each said intermediate cylinder, and processor means connected to each sensing means for determining relative differences in height between the intermediate cylinders for determining when the two jacks are out of synchronization.
Dependencies are inferred from the claim text.