Wiki as never seen before with photo galleries, discover something new today. The device uses one or more simple machines to create mechanical advantage and thus move loads beyond the normal capability of a human.
The most familiar form is an elevator, the car of which is raised and lowered by a hoist mechanism. Cranes have long been a popular subject for Meccano models, and luffing cranes are no exception. They were used for installing the large stone blocks used to build breakwaters, moles and stone piers.
The first of these systems used mechanical clutches between luffing and hoist drums, giving simplicity and a "near level" result. Types of cranes. Cranes by type.
An overhead crane consists of parallel runways with a traveling bridge spanning the gap. Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
South East London Meccano club.
Related to Level luffing crane. They were the builders of a variety of engineering products ranging from Dock cranes to construction plant and household cast iron items.
The usual mechanism for level-luffing in modern cranes is to add an additional "horse head" section to the top of the jib. A crane is a type of machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves, that can be used both to lift and lower materials and to move them horizontally.
Archived from the original on 2012-10-11. A winch is a mechanical device that is used to pull in or let out or otherwise adjust the tension of a rope or wire rope. CS1 errors: There are numerous hand-powered versions around the world and one surviving steam-powered example in Bristol Docks, England. They are also called portal cranes , the "portal" being the empty space straddled by the gantry.
A shiplift is a modern alternative for a slipway, a floating dry dock or a graving dry dock. A davit is any of various crane-like devices used on a ship for supporting, raising, and lowering equipment such as boats and anchors. By careful design of the geometry, this keeps level merely by the linked action of the pivots.