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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.
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".
Closed Van Veen grab sampler. The Van Veen grab sampler is an instrument to sample sediment in water environments. Usually it is a clamshell bucket made of stainless steel. Up to 20 cm deep samples of roughly 0.1 m 2 can be extracted with this instrument. It can be light-weight (roughly 5 kg) and low-tech. The smallest version even fits into ...
It is a modified version of the Van Veen grab sampler, with a clamshell bucket made out of stainless steel mounted to a supporting frame. The sampling area extracted with this instrument can vary depending on its size. With the modifications this version of the Van Veen grab sampler is heavier than the traditional version.
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).
Clamshell buckets from a retired coal-loading crane, now displayed at a dock re-development in Cardiff The clamshell bucket is a more sophisticated articulated several-piece device, including two elementary buckets associated on a hinged structure forming a claws-like appendage with an internal volume.
Buckets have numerous shapes and sizes for various applications. There are also many other attachments that are available to be attached to the excavator for boring, ripping, crushing, cutting, lifting, etc. Attachments can be attached with pins similar to other parts of the arm or with some variety of quick coupler .
A crane's discharge rate is limited by the bucket's capacity (from 6 to 40 tons) and by the speed at which the crane can take a load, deposit it at the terminal and return to take the next. For modern gantry cranes, the total time of the grab-deposit-return cycle is about 50 seconds.