Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control
Patent
1998-08-12
1999-04-06
Young, Karen M.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
167391, 167393, 167414, B66B 900
Patent
active
058905642
ABSTRACT:
A hoisting rope for an elevator includes a plurality of longitudinally spaced, discrete targets retained within the rope. The targets have a characteristic that may be monitored by a device that is responsive to that characteristic. In a particular embodiment, the targets are formed from a magnetically permeable material and the monitoring device responds to changes in the magnetic field as the target passes the monitoring device. In another embodiment, the targets are formed from material that reflects electromagnetic energy. In this embodiment, the monitoring device emits electromagnetic energy and is sensitive to the energy that is reflected back from the target. A method to inspect the hoisting ropes includes the steps of positioning the monitoring device proximate to the hoisting rope, moving the hoisting rope relative to the device, and monitoring the targets to determine the spacing between targets. Changes in spacing are indicative of stretching of the rope, and thereby degradation of the rope.
REFERENCES:
patent: 2042201 (1936-05-01), Williams et al.
patent: 2306816 (1942-12-01), Larson
patent: 4664229 (1987-05-01), Obst
patent: 5609225 (1997-03-01), Lamb et al.
patent: 5747755 (1998-05-01), Coste et al.
O'Donnell Hugh J.
Olsen Eric G.
Hess Douglas A.
Otis Elevator Company
Young Karen M.
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