𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Optimum pinch grips in the handling of dies

✍ Scribed by Carol Heffernan; Andris Freivalds


Book ID
104105021
Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
292 KB
Volume
31
Category
Article
ISSN
0003-6870

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✦ Synopsis


Handling roller-press dies has caused numerous work-related musculoskeletal disorders in the leather industry. The dies are quite large (0.61 x 0.30 m), heavy (3.5 kg) and are difficult to handle because of the large pinch span requirements (up to 16 cm). The purpose of this study was to determine the optimum pinch span and optimum crossbar angulation to minimize die handling forces. Five-finger pulp-pinch forces were measured on five males and five females with a force-sensitive-resistor instrumented glove while handling a simulated adjustable die. Maximum pinch forces occurred at pinch spans between 1.27 and 3.81 cm, with average female strengths being 57% of average male pinch strengths. Minimum pinch forces to hold the die occurred at a 45 degrees angulation and increased linearly as the angle approached 90 degrees or the normal vertical orientation. The simplest solution to redesigning the dies is to: (1) decrease the distance between the braces to less than 4 cm and (2) slant the braces at 45 degrees.


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