Grab (tool)
Encyclopedia
A grab is a mechanical device with two or more jaw
Jaw
The jaw is any opposable articulated structure at the entrance of the mouth, typically used for grasping and manipulating food. The term jaws is also broadly applied to the whole of the structures constituting the vault of the mouth and serving to open and close it and is part of the body plan of...

s (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
      Polyp
      A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are approximately cylindrical in shape and elongated at the axis of the body...

       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)

External images

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK