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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".
The clamshell bucket on the left hand side of the photograph on this page at Cardiff is a self-dumping chain grab. Generally, grabs have an open top to the shell body. Grabs handling light-weight powders which may be blown from the grab are sometimes fitted with covers which may be fixed or pivoted at the lower arm connection.
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.
Principle of rope-shovel operation. [1]A power shovel, also known as a motor shovel, stripping shovel, front shovel, mining shovel or rope shovel, [2] is a bucket-equipped machine usually powered by steam, diesel fuel, gasoline or electricity and used for digging and loading earth or fragmented rock and for mineral extraction. [3]
A clamshell is a one-piece container consisting of two halves joined by a hinge area which allows the structure to come together to close. Clamshells can be made to be reusable and reclosable [ 1 ] or can be sealed securely.
The scoop stretcher (or clamshell, Roberson orthopedic stretcher, or just scoop) is a device used specifically for moving injured people. It is ideal for carrying ...
The buckets can be also triangular in cross-section and set close together on the belt with little or no clearance between them. This is a continuous bucket elevator. Its main use is to carry difficult materials [clarification needed] at a slow speed. Early bucket elevators used a flat chain with small, steel buckets attached every few inches ...
A grab dredge. Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.