ELEVATOR SYSTEM WITHOUT A MOVING COUNTERWEIGHT

Title:

ELEVATOR SYSTEM WITHOUT A MOVING COUNTERWEIGHT

Document Type and Number:

WIPO Patent Application WO2004094287

Kind Code:

A3

Abstract:

An elevator system (20) includes a cab (22) supported for movement within a hoistway. A plurality of cab-supported sheaves (36, 42) moves with the cab through the hoistway. A first hoistway sheave (38) is located near a first end of the hoistway, and a second hoistway sheave (40) is located near a second end of the hoistway. A load bearing member (30) is provided, which (i) extends from near the first end of the hoistway toward the cab, where the load bearing member is redirected by one of the plurality of cab-supported sheaves toward the first end of the hoistway, (ii) at least partially wraps around each of the first hoistway sheave and the second hoistway sheave, and (iii) extends from near the second end of the hoistway toward the cab, where the load bearing member is redirected by another of the plurality of cab-supported sheaves toward the second end of the hoistway. A tension device (44) maintains tension in the load bearing member.

Inventors:

SIEWERT BRYAN ROBERT (US)
THOMPSON MARK S (US)
HOLOWELL RICHARD L (US)

Application Number:

PCT/US2004/012420

Publication Date:

March 03, 2005

Filing Date:

April 22, 2004

Export Citation:

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Assignee:

OTIS ELEVATOR CO (US)
SIEWERT BRYAN ROBERT (US)
THOMPSON MARK S (US)
HOLOWELL RICHARD L (US)

International Classes:

B66B7/10; B66B11/08; B66B; (IPC1-7): B66B11/08; B66B7/10

Foreign References:

US3101130A	1963-08-20
US5526901A	1996-06-18
US5509503A	1996-04-23

Other References: