Twin post, telescoping jack hydraulic elevator system

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United States of America Patent

PATENT NO 5597987
SERIAL NO

08377078

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
DELAWARE CAPITAL FORMATION INCRODNEY SQUARE NORTH A CORP OF DE WILMINGTON DE 19890

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gilliland, Oscar Nesbit, MS 3 37
Hughes, Martin W Memphis, TN 5 301
Thurmond, III Charlie R Southaven, MS 2 43
Tomes, Paul Memphis, TN 1 35
Vafaie, Foad Germantown, TN 5 177

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