Imperial
VII. Appendix: Liberty Mutual ("Snook") Data
The following data is a useful subset (females only) of data published in: Ciriello, V.M., and Snook, S.H., (1991), “The Design of Manual Handling Tasks: Revised Tables of Maximum Acceptable Weights and Forces.” Ergonomics, 34(9), pp. 1197-1213. The entire data set, including many combinations of pushing and pulling activities for both males and females, is too extensive to reproduce here.
Table 1 summarizes initial push force data for the more conservative approach of designing for 90% of the female population. Table 2 summarizes the same for 75% of the female population. Tables 3 and 4 summarize the same for sustained (rolling) push forces. Note that some of the data is italicized, which means that exposing a person to those push conditions may exceed her physiological capabilities if carried out over an 8-hour or more work day, which can result in fatigue, or even cardiovascular failure.
Table 1. Initial push forces that should be acceptable for 90 percent of all female workers, and therefore most males, as well. All force values are in kg (multiply value by 2.2 to convert to lb).
Table 2. Initial push forces that should be acceptable for 75 percent of all female workers, and therefore most males, as well. All force values are in kg (multiply value by 2.2 to convert to lb).
* Bolded values in the above table indicate conditions that exceed the 8 hour physiological criteria.
Table 3. Sustained push forces that should be acceptable for 90 percent of all female workers, and therefore 99 percent of males, as well. All force values are in kg (multiply value by 2.2 to convert to lb).
Table 3. Sustained push forces that should be acceptable for 90 percent of all female workers, and therefore 99 percent of males, as well. All force values are in kg (multiply value by 2.2 to convert to lb).
* Bolded values in the above table indicate conditions that exceed the 8 hour physiological criteria.
Table 4. Sustained push forces that should be acceptable for 75 percent of all female workers, and therefore most males, as well. All force values are in kg (multiply value by 2.2 to convert to lb).
Table 4. Sustained push forces that should be acceptable for 75 percent of all female workers, and therefore most males, as well. All force values are in kg (multiply value by 2.2 to convert to lb).
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