Grab (tool)
Clamshell grab on truck, loading concrete demolition rubble, Manchester, England, July 2009
A grab is a mechanical device with two or more jaws (also called clamshells), used to pick things up or to capture things. Some types include:
- Roundnose grab
- Clamshell grab
- Orange-peel grab
- in Dutch they are called poliep grijpers = "polyp grabs".
There are different ways of open/close the grabs:
- electro-hydraulic / diesel-hydraulic
- mechanical by rope(s) (1-rope, 2-ropes, 3-ropes, 4-ropes)
Grabs can be used for:
- dredging
- bulk handling (e.g. loading/unloading ships)
- salvage (e.g. ship-wrecks, oil)
