ELSCO; Elevator Roller Guides

Case Study

The Problem:
Poor Ride Quality

Case Study Building

In 2007, ELSCO received calls from an elevator consultant and a major elevator contractor, who worked on a high-profile luxury condominium development in Boston. Both consultant and contractor reported very poor ride quality in the newly-installed 1,000 fpm, 3,500 lbs. capacity (5.0 m/s, 1,600 kg. capacity) passenger elevators. Condo owners felt the ride quality was not commensurate with the multimillion-dollar prices of their homes.

The Root Cause:
Poor Rail Alignment from
Rushed Installation

ELSCO personnel visited the job site to assess the problem, and determined that the root cause of the ride quality issues was poor rail alignment, caused by a rushed installation schedule. DBG (distance between guide rails) measurements varied at different points in the hoistway by nearly one full inch (25mm). The root-cause fix to this problem would have been a thorough rail re-alignment. Unfortunately, such re-alignments in occupied buildings are expensive, time consuming, and logistically problematic – taking new elevators out of service is never popular with building owners. Both contractor and consultant needed a cost effective solution with minimal downtime.

The Solution & Result:
Express-3 Dramatically
Improves Ride Quality

ELSCO proposed replacement of the existing roller guides with ELSCO Express-3 roller guides. These guides incorporated patent-pending, shock absorbing elastomeric pivot bushings, neoprene roller wheels, and high-quality construction to dramatically reduce the effects of misaligned rails – at a fraction of the cost of rail re-alignment.

ELSCO Express-3 guides improved the ride quality in dramatic, measurable fashion. ELSCO was able to determine that maximum peak-to-peak lateral accelerations and A95 “average” lateral accelerations were reduced by 50% or more. Both consultant and contractor were pleased with the ease, low cost, and effectiveness of the ELSCO solution.

Case Study Ride 01 Case Study Ride 02 Case Study Ride 03 Case Study Ride 04

Quantitative Measurements:

Measurements

Note: In the above tables, the first listed number refers to Maximum Peak-to-Peak value, and the second listed number refers to A95 "average" value. All values are listed in milli(g).