Richard N. Fargo of Plainville, Connecticut, has assigned to Otis Elevator Co. of Farmington, Connecticut, U.S. Patent No. 7,537,091 dated May 26, 2009.rnAn elevator door mover device includes a threaded ferromagnetic shaft. Magnetic movers associated with doors generate magnetic fields that cause the doors to move responsive to rotation of the shaft. In one example, a controller controls a speed of a motor that drives the shaft. The controller in some examples also selectively controls the strength of the magnetic fields of the movers, which provides more customizable door performance.
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机译：康涅狄格州普莱恩维尔的Richard N.Fargo已于2009年5月26日转让给康涅狄格州法明顿市的Otis Elevator Co.公司，美国专利号为7,537,091的专利。电梯门推动器装置包括铁磁螺纹轴。与门相关的磁力推动器产生的磁场会导致门响应于轴的旋转而移动。在一个示例中，控制器控制驱动轴的电动机的速度。在一些示例中，控制器还选择性地控制动子的磁场强度，这提供了更多可定制的门性能。
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