Spacing control for two elevator cars in a common shaft
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United States of America Patent
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May 14, 2013
Grant Date -
Feb 10, 2011
app pub date -
Dec 8, 2008
filing date -
Dec 21, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Lift system (10) with a lower lift cage (K1), an upper lift cage (K2), at least one counterweight (12), and support means (TA, TB) for supporting the lower and upper lift cages (K1, K2). The support means (TB) for supporting the lower lift cage (K1) are led downwardly in the lift shaft (11) laterally along the upper lift cage (K2). Drive means for driving the lower and upper lift cages (K1, K2) are present. Arranged at the upper lift cage (K2) is a first incremental transmitter (I1) which interacts with one of the support means (TB) and supplies information about a change in the spacing (D) between the lower and upper lift cages (K1, K2).
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