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US 8,631,917 B2Granted
Elevator brake with magneto-rheological fluid
AssigneeOtis Elavator Company
InventorsZbigniew Piech, Wojciech Szelag
Life of this patent
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Abstract
An elevator brake assembly includes a braking fluid for providing a braking force. A first magnet provides a first magnetic field that influences the braking fluid to provide the braking force. The second magnet selectively provides a second magnetic field that controls how the first magnetic field influences the braking fluid to control the braking force.
Claims5
An elevator brake assembly comprising:
- a brake member for rotation with an elevator machine shaft, the brake member including a rotor extending in a radial direction relative to the elevator machine shaft, the rotor including a drum extending axially from the rotor;
- a braking fluid adjacent the brake member and in contact with the drum;
- a permanent magnet for providing a first magnetic field that influences the braking fluid to provide a braking force on the brake member;
- and
- an electromagnet for selectively providing a second magnetic field that controls how the first magnetic field influences the braking fluid to control the braking force on the brake member.
2 more elements
Dependencies are inferred from the claim text.