When non-powered trucks or pallet trucks are used for the moving of heavy loads, the greatest forces must be exerted during the navigation of uneven surfaces and movement of the load from rest. Even though such transport equipment makes normal transport operations much easier than manual load handling, these peak stresses may give rise to problems. This is particularly the case during tasks of intense activity in warehouse areas, where loads must frequently be moved from rest and braked again.
[Note: BT is a trade mark of Toyota Material Handling in Europe]
Standards relevant to powered industrial trucks can be found on ErgoNoRA by use of the following search Terms:
The Technical Report ISO/TR 22100-3 describes how ergonomic principles can be applied during the risk reduction process according to ISO 12100 and how ergonomics standards can be applied to machinery. It helps designers take decisions with respect to ergonomics during the machine design process and can also be used when no relevant type C standards are available.
When pallet trucks are used to transport loads, the greatest effort is normally required at initiation of movement of the load. Under normal circumstances, loads are transported on smooth floors. Floor joints, drops on loading ramps or similar obstacles may however have to be overcome by brief exertion of a higher force (see also EN 1005-3).
The start-assist for pallet trucks exploits the lever principle of force transmission in that the movement of the tiller is transferred directly to the wheels by means of an engageable mechanism. This results in the force required for initiation of movement of the load being reduced substantially, without restrictions in the process of movement (see EN ISO 3691-5:2010, Annex A). The lever movement is identical to the normal movement of the tiller at the start of travel.