101 TRESTON - ERGONOMICS | ESD | LEAN Elbow height is the optimal position in regard to push forces. Displayed heights are indicative for average sized male. Consider the handle position and design Vertical handles are considered the most optimal, as every sized worker is able to grasp the handles in their unique power zone. Handles can be horizontal as well, as long as they are the correct height for the user. Preferred handle height is between the shoulder and knuckle height of the worker, optimizing the force applied for pushing and pulling. The optimal shape for handles is cylindrical and smooth, which allows the best power grip with straight wrists. The handle diameter should be big enough to enable power grip instead of pinch grip. Power grip provides up to 75% more strength compared to pinch grip. Power grip involves grasping the handle by wrapping all the fingers around it, instead of grasping with thumb and tips of the other fingers. Shoulder height: 55.1" Elbow height: 43.3" Knuckle height: 31.5" Knee height: 23.6" Hip height: 37.4" Carts In the past decades, industrial workspaces have been mostly redesigned so that carrying objects has been replaced by transporting objects by pushing or pulling them in carts, carts, hand pallet trucks and such. For example, in the automotive supply sector about 10% of all working processes involve pushing and pulling on a regular and repetitive basis. In addition, the rapid growth of the e-commerce sector has increased the number of distribution centers worldwide. The primary job at these distribution centers is order picking and delivery, where manual handling aids such as carts, carts, hand pallet trucks and such are used to perform the tasks. The use of these aids has again eliminated carrying objects, changing the nature of manual load handling tasks predominantly to pushing and pulling. In general, it has been estimated that nearly half of common manual load handling tasks in workplaces consist of pushing and pulling exertions performed on level surfaces and variable inclined ramps. CHANGE IN THE NATURE OF MANUAL LOAD HANDLING TASKS
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