B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
B66B 13/14 (2006.01) B66B 1/50 (2006.01) B66B 13/22 (2006.01)
Patent
CA 2180090
In this equipment for the positioning of a lift cage (1), a light curtain (9) with several light beams extends over the length of a cage threshold (5) and over the height of the cage door. The light curtain (9) is produced by means of a first transmitter strip (10) and a receiver strip (11) and blocks the lift cage (1) in case persons or objects are in the region of the cage doors (7) or storey doors (8). A respective light transmitter lies opposite each light receiver so that the light beam of the one light transmitter impinges on the one light receiver. In case at least one light beam is interrupted by persons or objects, the lift cage (1) remains blocked. At the end of the storey threshold (6) at the receiver strip side, a pivotable masking plate (12) projects into the light curtain (9) and is so dimensioned that a light beam impinges on the masking plate (12) instead of on the receiver strip (11). The interrupted light beam is a measure for the actual position of the lift cage (1). A correction magnitude, by which the lift cage (1) is moved until it has reached the target position, arises from a predetermined target value and the actual value of the cage position.
Liebetrau Christoph
Nlabu Frederic T.
Ag Inventio
Riches Mckenzie & Herbert Llp
LandOfFree
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