Importance

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Abstract

A single cable descent control device comprises a pair of rotors with corresponding frames of conductive material mounted on a common central axle on either side of a drive pulley. The pulley is adapted to sit above a single descent cable. An enclosure is suspended from the device. Disposed along at least one surface of each of the rotors or of the corresponding frames or both, is a series of magnets such that rotation of the rotors relative to the frames induces eddy currents that oppose the magnetic field and create a rotational braking force providing precise and controllable descent of the enclosure with little or no mechanical wear or risk of overheating. In this configuration, constraints on the size of the enclosure are dispensed with, as are corresponding limitations on the positioning and angle of descent of the cable. Further, significant labor and material savings in manufacturing the enclosure may be obtained from the resulting simplicity of design. The device may be used in numerous other applications, including without limitation, permitting controlled descent of gondolas or chairs from ski lift operations when normal lift operation is temporarily precluded.

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First Claim