| 摘要 |
An elevator system ( 20 ) includes a cab ( 22 ) supported for movement within a hoistway. A tension device ( 44 ) remains close to one end ( 26 ) of the hoistway. The tension device ( 44 ) maintains a desired tension on a load bearing member ( 30 ) that supports a weight of the cab ( 22 ) and moves to achieve a desired placement of the cab within the hoistway. The load bearing member ( 30 ) extends from the first end of the hoistway toward the cab, wraps at least partially around a first sheave ( 36 ) supported for movement with the cab, extends from the first sheave ( 36 ) toward the first end ( 24 ) of the hoistway, wraps at least partially around a second sheave ( 38 ) supported near the first end of the hoistway, extends from the second sheave toward a second end ( 26 ) of the hoistway, wraps at least partially about a third sheave ( 40 ) supported near the second end of the hoistway, extends toward the cab from the third sheave, wraps at least partially around a fourth sheave ( 42 ) supported for movement with the cab, and extends from the fourth sheave toward the second end of the hoistway where it is secured to the tension device ( 44 ).
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