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what is a deflector sheave

by Billy Stokes Published 3 years ago Updated 3 years ago

One or more deflector sheaves are located between the traction sheave and the elevator car over which the belt is routed to guide the belt to the elevator car. The one or more deflector sheaves include an outer sheave surface having a distance from a sheave axis that varies along a width of the traction sheave.

One or more deflector sheaves are located between the traction sheave and the elevator car over which the belt is routed to guide the belt to the elevator car. The one or more deflector sheaves include an outer sheave surface having a distance from a sheave axis that varies along a width of the traction sheave.

Full Answer

What is a deflector sheave isolator?

For ease of installation, the Deflector Sheave Isolators™ are designed to bolt to the machine beams using the same holes as the original deflector sheave. This allows the isolators to be installed with the elevator installation or added as a retrofit without having to drill new holes in the machine beams.

How much space do you need for elevator deflector sheave?

This allows the isolators to be installed with the elevator installation or added as a retrofit without having to drill new holes in the machine beams. The assemblies typically require 6.75" of vertical space, lowering the deflector sheave by that amount.

How are deflectors isolated from the building?

Typically elevator drive machines are isolated at their mounting, most commonly with neoprene pads or engineered isolators. Most deflector/overhead sheaves, however, are bolted directly to the underside of the machine beams and are not isolated from the building structure.

How do I center the deflector sheave with the plumb rope?

Care must be taken to center the deflector sheave with the plumb rope drop so as to eliminate any side pull on the sheave or isolators. The isolator assemblies are manufactured with pride in the USA to strict tolerances.

What is a deflector sheave?

A deflector sheave for an elevator system comprising: an outer sheave surface having a distance from a sheave axis that varies along a width of the traction sheave, the outer surface including: a first portion having a first coefficient of friction; and one or more second portions having a second coefficient of friction less than the first coefficient of friction, the first portion guiding an elevator belt toward a lateral center of the outer surface.

What is an elevator system?

An elevator system includes an elevator car, a motor, and traction sheave operably connected to the motor to drive rotation of the traction sheave. A belt is operably connected to the elevator car and in frictional contact with the traction sheave to urge movement of the elevator car. One or more deflector sheaves are located between the traction sheave and the elevator car over which the belt is routed to guide the belt to the elevator car. The one or more deflector sheaves include an outer sheave surface having a distance from a sheave axis that varies along a width of the traction sheave. The outer surface includes a first portion having a first coefficient of friction and a second portion having a second coefficient of friction less than the first coefficient of friction, the first portion guiding an elevator belt toward a lateral center of the outer surface.

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