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A gin pole is a mast supported by one or more guy-wires that uses a pulley or block and tackle mounted on its upper end to lift loads. The lower end is braced or set in a shallow hole and positioned so the upper end lies above the object to be lifted. The pole (also known as a mast, boom, or spar) is secured with three
1 – boom, 2 – mast, 3 – gooseneck, 4 – sail, 5 – topping lift... 7 – mainsheet, 8 – boom vang.... In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail.
For small booms, the topping lift may be run from end of the boom to the backstay or next mast aft. When the sail is raised again, the topping lift is loosened or removed. On sailboats used for racing, boom lift function is frequently incorporated into the boom vang system, to reduce the number of lines aloft. Allowing the vang to take this ...
A Chicago boom derrick is a derrick with a boom which is attached to an external structure. The external upright member of the structure serves as the mast, and the boom is stepped in a fixed socket clamped to the upright. The boom is connected to at least three pulley systems to control the position of the boom.
JLG 1200SJP Boom Lift. JLG introduced its first scissor lift in 1973, and in 1979, scissor lift production began in JLG's Bedford, Pennsylvania location. The firm's current product line includes the following types of items: Mast booms and boom lifts (aerial work platforms) Towable & trailer mounted boom lift trucks and telehandlers; Vertical ...
Some line vang systems incorporate a piston to provide the topping lift force and to damp oscillations. Hydraulic vangs can inherently act in the topping lift role. A gnav (the word vang spelt backwards) is an inverted vang. It is a rigid strut that extends obliquely upward from the boom to the mast, exerting a force that pushes down on the boom.