Elevator with rollers having selectively variable hardness

Details Elevator with rollers having selectively variable hardness Elevator with rollers having selectively variable hardness

2003-04-15

2009-06-09

Benson, Walter (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

C187S345000

Reexamination Certificate

active

07543686

ABSTRACT:
An elevator system includes a roller (16) having a hardness that varies responsive to a magnetic field (20). The roller (16) rolls along a guide rail (28) to maintain a desired orientation of the elevator car (12). In one example, the roller (16) includes a membrane (30) defining a generally annular chamber (36) containing fluid (22) that changes viscosity responsive to changes in the magnetic field (20). The rollers (16) are associated with at least one magnetic field generator (18) that generates a magnetic field (20) of a selected strength. Varying the magnetic field varies the hardness of each roller (16) to control vibrations of the elevator car (12) to improve ride quality.

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