Loading bay personnel face problems every day but one everyday problem can be solved with the aid of an essential piece of equipment. The snag lies in any discrepancy between the height of a truck's load deck and that of the loading bay's platform. Should a mismatch exist, it has to be bridged and this is what a dock leveller does.
Sounds simple enough, doesn't it? In a way, it is but there are caveats of which every loading bay manager must be aware. Such as? Well, like any 'link' in the loading bay's chain of components, the dock leveller has to be capable of handling the heavy loads involved. When bearing these loads in mind, it isn't merely a matter of considering the avoirdupois weight of the goods concerned. This may be significant but a dock leveller also has to accommodate the weight of the means by which the goods are moved, be they trolleys, palette trucks or forklifts. In this context, the weight of the individuals handling the goods is insignificant but the dock leveller must also cater for the additional, near-horizontal loads applied by the moving and braking, especially of powered equipment. Load ratings of 6,000 or 9,000kg are popular but it's common for specially rated dock levellers to be offered in a variety of sizes.
The two main types of dock levellers share steel construction and feature proven aspects including an anti-slip deck and a corrosion-resistant finish. The difference exists in the lip that lies adjacent to the truck's load deck. This may be simply hinged but a telescopic lip version is also available. The dock leveller's height adjustment works equally well in either case but a telescopic lip also allows fine-tuning of the dock leveller to the relative positions of itself and the truck bed. Unsurprisingly, a European standard, EN 1938, applies to dock levellers; make sure the chosen unit complies.
Dock levellers may be mounted in a purpose-built pit and there are suspended frame versions for use with tail lifts. Moreover, dock levellers offer a mechanism that makes for ease of use. An electro-hydraulic operating system, powered by an electric motor that has a low-voltage control unit, makes applying the relative adjustments not only child's play but also the work of moments.
While they have to be visibly tough, dock levellers must also have hidden strengths. In a correctly designed unit, the support frame will transmit loads from the truck's deck without incurring fatigue and consequent loss of structural integrity. Limited torsional diagonal loadings should also be tolerated; dealing with a vehicle with a canted bed will impose them. Furthermore, while dock levellers may seem to be laughably simple items, a range of optional extras takes them into a higher realm of functionality. Such extras include practical additions like high impact absorbing buffers, brush seals for the sides and rear of the deck assembly and under-deck foam insulation. More, let's say, active options include automatic, synchronised parking, a vehicle restraint system with an interlock facility, an automatic docking light interface, and a door interlock mechanism.
As is undoubtedly clear, some forethought is needed when choosing dock levellers. Given this, those chosen should give the loading bay long-lived, reliable levellers that make light work of loading and unloading while maximising loading bay uptime.
Chase Equipment are a leading international supplier of dock levellers. See our website at Chase Equipment for more information.
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