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grabs

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William,
This type of grab is known as a cactus or petal grab. It is often used for dredging hard sand and also for the discharge of iron ore or similar cargoes. It will dig harder materials but if using this type to discharge of ships, it can be hard on the hold ceilings as when the cargo is getting down the grab is landing on the points rather than the flat blades of a conventional grab. The science of different types of grabs is fascinating. We have grabs for discharging grain ( sadly no longer used) which have only two falls in the closing mechanism, they close and open very quickly as grain is easy digging, but we also have dredging grabs with 5 falls, to slow down the closing speed and increase the leverage on the digging blades, coal grabs with 4 falls and so on. I am talking of course on rope grabs as opposed to hydraulic ones.

Stephen
 

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thanks for further details, Stephen

In the early days saw grabs simply pulled open by ropes, interesting to note that quite some varieties nowadays to make grabs not just grabs

ww
 

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WILLIAM WONG
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