2012-02-01 12:00 - Messages

Assessment of slip resistance under footwear materials, tread designs, floor contamination, and floor inclination conditions

Slip and fall incidences are common in our daily lives. They are not only important environmental safety issues but also important occupational safety and health problems. The purpose of this study was to use the Brungraber Mark II to measure the friction so as to investigate the effects of the shoe sole, surface condition and the inclined angle of the floor and their interactions on friction coefficient. The results of the study showed the effects of all the main factors and their interactions were significant (p<0.001). Engineering designs & ergonomic interventions in slip & fall prevention should take these factors in full consideration.

Source : Li KW, Chen CY, Chen CC, Liu L. Work. 2012 Jan 1;41(0):3349-51.

Connecting components for personal fall arrest systems (PFAS)

This Standard specifies design and performance requirements, test methods, and requirements for marking and labelling individual connecting components used as part of a personal fall arrest system (PFAS). This Standard applies to components that are
(a) used in the interconnection of a complete PFAS unit in accordance with CSA Z259.10;
(b) intended to be used as the primary single link to a permanent anchorage connector; or
(c) intended to be used as a primary attachment point between two or more subsystems.

Source : http://shop.csa.ca/fr/canada/fall-protection/z25912-11/invt/27013272011/?utm_source=ohs-news-feb12&utm_medium=newsletter&utm_term=z259.12-11&utm_content=html-txt-link&utm_campaign=health&utm_language=en

Hand breakaway strength model-Effects of glove use and handle shapes on a person's hand strength to hold onto handles to prevent fall from elevation.

This study developed biomechanical models for hand breakaway strength that account for not only grip force but also hand-handle frictional coupling in generation of breakaway strength. Specifically, models for predicting breakaway strength for two commonly-used handle shapes (circular and rectangular handles) and varying coefficients of friction (COF) between the hand and handle were proposed. The models predict that (i) breakaway strength increases with increasing COF and (ii) a circular handle with a 50.8mm-diameter results in greater mean breakaway strength than a handle with a rectangular cross-section of 38.1 by 38.1mm for COFs greater than 0.42. To test these model predictions, breakaway strengths of thirteen healthy young adults were measured for three frequently-encountered COF conditions (represented by three glove types of polyester (COF=0.32), bare hand (COF=0.50), and latex (COF=0.74) against an aluminum handle) and for the two handle shapes. Consistent with the model predictions, mean breakaway strength increased with increasing COF and was greater for the circular than rectangular handle for COFs of 0.50 and 0.74. Examination of breakaway strength normalized to body weight reveals that modification of COF and handle shapes could influence whether one can hold his/her body using the hands or not (thus must fall), highlighting the importance of considering these parameters for fall prevention. The biomechanical models developed herein have the potential to be applied to general handle shapes and COF conditions. These models can be used to optimize handle design to maximize breakaway strength and minimize injuries due to falls from ladders or scaffolds.

Source : Hur P, Motawar B, Seo NJ. J. Biomech. 2012.
DOI: 10.1016/j.jbiomech.2012.01.013 

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