Английская Википедия:Grab (tool)

Материал из Онлайн справочника
Перейти к навигацииПерейти к поиску

Шаблон:Other uses

Файл:KinshoferGmbH KM 604HPX in action.jpg
A clamshell bucket

A grab or mechanical grab is a mechanical device with two or more jaws (sometime clamshell-shaped), used to pick things up or to capture things. Some types include:

  • Roundnose grab
  • Clamshell grab
  • Orange-peel grab
    • in Dutch and German they are called poliep grijpers/ Polypengreifer = "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)
  • seabed sampling[1]

History

The mechanical grab,[2]Шаблон:Rp specifically the clamshell grab,[3] was invented by the Persian Banu Musa brothers and described in their Book of Ingenious Devices in the 9th century. It was an original innovation by the Banu Musa that does not appear in any earlier Greek works.[2]Шаблон:Rp The grab described by the Banu Musa was used to extract objects from underwater,[2]Шаблон:Rp and recover objects from the beds of streams.[3]

See also

References

Шаблон:Reflist

External links

Шаблон:Commons category-inline


Шаблон:Tool-stub

  1. Шаблон:Cite book
  2. 2,0 2,1 2,2 Шаблон:Citation
  3. 3,0 3,1 Donald Routledge Hill, "Mechanical Engineering in the Medieval Near East", Scientific American, May 1991, p. 64-69