The Grapner clamshell grab can be distinguished from ordinary models by a layout with moving, rather than fixed, pivot points, with buckets that work together or independently. It can therefore excavate holes with vertical sides (in suitable materials).
Keywords: clamshell buckets, truck loading crane, grapples, grab, soil, abrasion, wear, moving ejectors, accessories of trucks
The efficiency is higher, because it is possible to work on one plane in both the opening and the closing cycle of the buckets.
The buckets open and close around moving articulations, giving the grab exceptional ability to penetrate even very hard soils.
Its geometry adapts itself automatically to different working conditions and the buckets will then adjust to the grabbed objects.
The Grapner clamshell grab also has moving ejectors to expel materials which have a tendency to stick to the buckets (earth, clay etc…).
No additional hydraulic hose is required compared to the regular equipment of lorry cranes or other excavation vehicles.
The materials used for the manufacture of the Grapner grab are of high quality. It uses special steels which are particularly resistant to stone abrasion and wear.
The grab is manufactured and assembled in Switzerland, by a certified company.
The Grapner grab is designed to be used on a lorry crane with a capacity higher than 10 tonne meters.