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The most importannt part in elevator is brake. Brake is a pair of shoes that apply equal and opposite pressure to a drum (motor elevator drum), puley or a disc mounted on the motor shaft. Elevator brake is made up of a compressive spring assembly, brake shoes with linings, and a solenoid assembly. When the solenoid is not energized, the spring forces the brake shoes to grip the brake drum and induce a braking torque. The magnet can exert a horizontal force for the break release.To stop and hod the car movements when the power is lost used spring clamp. Spring clamp will push back the shoe brake to making fail safe stops and holds the car when power is lost. In order to improve the stopping ability, a material with a high coefficient of friction is used within the breaks, such as zinc bonded asbestos. A material with too high a coefficient of friction can result in a jerky motion of the car. This material must be chosen carefully.


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