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The detecting range of a photoelectric sensor is its "field of view", or the maximum distance from which the sensor can retrieve information, minus the minimum distance. A minimum detectable object is the smallest object the sensor can detect. More accurate sensors can often have minimum detectable objects of minuscule size.
A door operator may be triggered in various ways: Approach Sensor (such as a radar sensor) - the door opens when a user approaches it. Pushbutton - the door opens when a user presses a button. Access control - the door opens when an access control system determines the user is authorized to go through. Automatically (in the case of elevators).
Montgomery Elevator: Acquired by Kone, Canadian division in 1985 and U.S. division in 1994. Marshall Elevator: Sold to Otis; Schweizerische Aufzügefabrik AG; Thyssen AG: Merged with Krupp and became ThyssenKrupp in 1999, with subsidiary ThyssenKrupp Elevator AG; ThyssenKrupp Elevator AG announced in 2021 a name change and rebranding to TK ...
The first footprint in Asia was set in 1995 by establishing the subsidiary Suzhou Selcom (today Wittur Elevator Components (Suzhou)) in China. In the course of years the production plant in Suzhou, China was steadily enlarged and by now more than 650,000 elevator doors are produced there on a yearly basis (2013). [3]
Otis elevator in Glasgow, Scotland, imported from the U.S. in 1856 for Gardner's Warehouse, the oldest cast-iron fronted building in the British Isles [7] Otis founded the Otis Elevator Company in Yonkers, New York, in 1853. When he died in 1861 his sons Charles and Norton formed a partnership and continued the business.
Dual door open and door close buttons, in an elevator with two sets of doors, found on a ThyssenKrupp elevator from the 2010s In case of dual doors, there may be two sets of door open and door close buttons, with one pair controlling the front doors, from the perspective of the console, typically denoted <> and ><, with the other pair ...
A door operator may use sensors to prevent the door from coming into contact with a user. Full Energy operators require at least 3 sensors. Low-energy operators are not required to have safety sensors, as the door is allowed to come in contact with a user, given that the kinetic energy of the moving door is limited by the reduced moving speed.
On April 22, 2006, three passengers were trapped in an elevator in Hachioji, Tokyo after the elevator's door opened while it was ascending. The elevator had faulty "TV60 v1.0" firmware. [10] On June 3, 2006, a Schindler elevator in Minato, Tokyo, started ascending while the door was open. A 16-year-old boy was crushed to death while getting off ...