Our Ergonomic Load Calculator is designed to assist the
Ergonomist, Safety and Health Specialist, and other Professionals interested in
improving health and safety practices in their workplace.
The calculator is designed to estimate the amount of horizontal force
necessary to move loads (on wheels) using inputs from particular workplace
environments. These forces are
those required to move loaded carts, castered equipment or machinery on wheels, or product being
propelled down an assembly line. The
calculator will combine conditions related to the state of the "vehicle
health", floor condition, terrain and footing as well as the weight of the
load being moved in
estimating these forces.
After determining the required force to move
the load, the calculator performs an ergonomic evaluation of the environment for pushing or pulling the load, using a human worker.
Taking input from a number of different variables related to the proposed
worker and application, the calculator provides an ergonomic estimate of the
amount of force that a single worker should apply: the so-called "Human Performance Capability."
The data used to compute the "Human Performance Capability" was an
extracted analysis taken from the following references and studies performed by
1. S.H. Snook and VM Ciriello, "The design of manual handling tasks:
revised tables of maximum acceptable weights and forces," Ergonomics,
v34, n9, 1991.
2. S.A. Konz, Work Design:
Industrial Ergonomics, 3rd
ed., Publishing Horizons, Inc., 1990.
3. A. Mital, AS Nicholson, and MM Ayoub, A Guide to Manual Material Handling, 2nd ed., Taylor
and Francis, 1997.
A result table is
provided to compare the estimated force requirement and the expected human
performance capability. If required
force exceed human performance capability several recommendations for safe
ergonomic practices are provided.
We strongly suggest that ergonomic solutions be
immediately implemented in cases where force exceeds capacity.
While injuries may not yet have been observed, the direct and indirect
cost associated with an injury or workers compensation claim will far exceed the
minimal cost of preventative equipment and/or redesigned procedures to reduce or
remove any potential problems.