Patent ID: 7665583
Filing Date: 2010-02-23
Classification: B66B

Abstract:
1. An elevator installation comprising: an elevator shaft; a counterweight and an elevator car, said counterweight and said elevator car being arranged to be movable along vertical rectilinear guide tracks and said elevator car being so connected by way of support means with said counterweight that on movement of said elevator car said counterweight executes an opposite movement and said elevator car moves past said counterweight in a proximity region in said elevator shaft, said elevator shaft having a first predetermined normal shaft cross-section in which said elevator car and said counterweight move along the guide tracks and said proximity region having a second predetermined cross-section adjacent said first predetermined cross-section forming an enlargement of said elevator shaft in order to reduce a pressure shock which builds up in said proximity region when said elevator car moves past said counterweight, wherein neither said elevator car nor said counterweight enters said enlargement during movement along the guide tracks, and wherein said enlargement is bounded by at least one side wall of said elevator shaft and said enlargement does not penetrate said at least one side wall.