Page 101 - Treston main catalogue 2021

TROLLEYS TROLLEYS

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, optimising 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: 1400 mm

Elbow height: 1100 mm
Hip height: 950 mm

Knuckle height: 800 mm

Knee height: 600 mm

Elbow height is the optimal position in regard to push forces. Displayed heights are indicative for average sized male.

CHANGE IN THE NATURE OF MANUAL LOAD HANDLING TASKS

In the past decades, industrial workspaces have been mostly redesigned so that carrying objects has been replaced by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 trolleys, 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 centres worldwide. The
primary job at these distribution centres is order picking and delivery, where manual handling aids such as carts, trolleys, 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.

Treston - For a better work environment 101