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When the rope is pulled upward again, the two buckets close and grab a sample from the sea floor. Two small technical changes lead to variations with more mechanical parts: The Ekman grab sampler does not close the shovels instantly on ground contact, but a messenger weight has to be sent down in order to release springs and take the sample.
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".
3850-B power shovels for stripping, one built each in 1962 and 1964, with bucket capacities of 115 and 145 cu yd (88 and 111 m 3). 2570-W or WS, one of B-E's most popular dragline models with bucket capacities between 120 and 160 cu yd (92 and 122 m 3). Ursa Major at Black Thunder Coal Mine was reported to be the third largest dragline ever built.
John Deere Front end loaders CAD model tracing of a tractor mounted loader mechanism CAD model tracing of a skid loader mechanism. A loader is a heavy equipment machine used in construction to move or load materials such as soil, rock, sand, demolition debris, etc. into or onto another type of machinery (such as a dump truck, conveyor belt, feed-hopper, or railroad car).
Subsets of the excavator bucket are: the ditching bucket, trenching bucket, A ditching bucket is a wider bucket with no teeth, 5–6 feet (1.52–1.83 m) used for excavating larger excavations and grading stone. A trenching excavator bucket is normally 6 to 24 in (152 to 610 mm) wide and with protruding teeth.
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The guide walls are constructed near the ground surface to outline the desired slurry trench, and to guide the excavation machinery. Excavation is done using a special clamshell-shaped digger or a hydromill trench cutter, suspended from a crane. The excavator digs down to design depth (or bedrock) for the first wall segment.
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