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A jackhammer (pneumatic drill or demolition hammer in British English) is a pneumatic or electro-mechanical tool that combines a hammer directly with a chisel. It was invented by William McReavy, who then sold the patent to Charles Brady King. [ 1 ] Hand-held jackhammers are generally powered by compressed air, but some are also powered by ...
Pancor Jackhammer. The Pancor Corporation Jackhammer is a 12-gauge, blow-forward gas-operated bullpup automatic shotgun designed in 1984 and patented in 1987. Only three working prototypes of the Jackhammer were built. Nonetheless, its distinctive aesthetics and futuristic design have made it popular as a weapon in many video games, notably ...
Pneumatic tool. Drilling a blast hole with a pneumatic drill (jackhammer). A pneumatic tool, air tool, air-powered tool or pneumatic-powered tool is a type of power tool, driven by compressed air supplied by an air compressor. Pneumatic tools can also be driven by compressed carbon dioxide (CO 2) stored in small cylinders allowing for portability.
Down-the-hole drill. A down-the-hole drill, usually called DTH by most professionals, is basically a jackhammer screwed on the bottom of a drill string. The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or drilling mud). The DTH hammer is one of the fastest ways to drill hard rock.
Hammer. A modern claw hammer suited to drive and remove nails. Cartwheel mallets with heads of felt held between steel washers for use with timpani drums. Detail of the head of a war hammer. A geologist's hammer used to break up rocks, as seen in archaeology and prospecting. A hammer is a tool, most often a hand tool, consisting of a weighted ...
Dowel bar retrofit. A dowel bar retrofit (DBR) is a method of reinforcing cracks in highway pavement by inserting steel dowel bars in slots cut across the cracks. It is a technique which several U.S. states' departments of transportation have successfully used in repairs to address faulting in older jointed plain concrete pavements.
War hammer. A sledgehammer is a tool with a large, flat, often metal head, attached to a long handle. The long handle combined with a heavy head allows the sledgehammer to gather momentum during a swing and apply a large force compared to hammers designed to drive nails. Along with the mallet, it shares the ability to distribute force over a ...
The rescuers' jackhammers were also inadequate, as they were designed for downward rather than horizontal drilling. A mining engineer eventually arrived to help supervise and coordinate the rescue effort, and a relatively new technology, waterjet cutting, was ultimately used to cut through the rock. [3] [4]
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