An Idea for a Method of Calculating the Height of the Rear Handle for Moving a Device when Prevents Toes from Touching a Device during Pushing

Abstract

Some carts, which are transport equipment equipped with rear handle for moving, are likely to be more physically strain demanding when pushed by an operator who is about 180 cm tall. This is a problem that can be attributed to the height of the real handle. Therefore, devised a method was developed to calculate the height of the rear handle, which is theoretically prevents toes from touching a device and can reduce physical strain when pushing a device. The height that prevents the toes from touching a device during pushing was determined from the operator’s forearm length, upper arm length and their angles, and the estimated step length. The range of heights that can reduce physical strain was obtained from the literature which reports the height at which it was easy to push the cart when pushing as a percentage of the height of the lower elbow by gender and age group. This calculation method was then applied to human body size data for Japanese female 5 %tiles and American male 95 %tiles. As a result, the rear handle height range of 942.5 - 1044.2 mm was achieved to prevent the toe from touching the device and to reduce the physical strain on the operator. Since the result was theoretically calculated values, would like to conduct verification experiments.