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Jackscrews are integral to the scissor jack, one of the simplest kinds of car jack still used. A scissor jack uses the mechanical advantage of a leadscrew and 4-bar linkage to allow a human to lift a vehicle by manual force alone. They are inexpensive and are common in manufacturer-supplied breakdown kits. The jack shown at the left is made for ...
In the 1950s the Dean brothers owned a repair service for automobiles, marine, and farm equipment called Universal Repair Service, which is now known as EBI, Elevating Boats LLC. As of 2018, the company operates 30 liftboats that service the shallow water oil and gas industry in the Gulf of Mexico from their liftboat dock in Houma, Louisiana.
The term "boat lift" originally referred to lift locks. In modern usage the term "boat lift," as opposed to "portable boat lift," usually refers to devices permanently installed at a dock to simply lift a boat above the water, a type of ship lift. It is not specifically designed for separating a boat from a trailer.
Rothensee boat lift: Saxony-Anhalt, Germany: 1938 Vertical caisson: 1000 tons 85 m × 12.2 m 279 ft × 40 ft 16 m 52 ft: 20 minutes: Falkirk Wheel: Falkirk, Scotland, United Kingdom: 2002 Rotating caisson: 600 tons 21.33 m × 6 m × 1.37 m 70 ft × 20 ft × 4 ft 24 m 79 fts: 4 minutes: The only rotating boat lift in the world. Henrichenburg ...
A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderate and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.
Dimensions were 158' 3" LOA × 32' beam (moulded) at deck × 8' draft powered by two 300 hp diesels, [42] and was equipped with a 30-ton jumbo lift boom along with regular cargo booms and had a cargo capacity of 500 measurement tons. These vessels were primarily used as supply ships, that could retrieve aircraft if needed.
The most common lift table design incorporates hydraulic cylinders and an electrically powered pump to actuate the scissor lifting mechanism. Lift tables can also be driven by pneumatic sources, trapezoidal-threaded screw drives, push chains or by hydraulic foot pump when the load is not heavy. The choice of drive mechanism depends on factors ...
A heavy-lift ship is a vessel designed to move very large loads that cannot be transported by normal ships. They are of two types: They are of two types: Semi-submersible ships that take on water ballast to allow the load—usually another vessel—to be floated over the deck, whereupon the ballast is jettisoned and the ship's deck and cargo ...
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