DERRICK J DAVIS

DEKALB, IL 60115

ROOFING CONTRACTOR

the free encyclopedia Lifting device For other usesas in a gin poleeither a guyed mast or self-supporting towerand a boom hinged at its base to provide articulationwhich allow it to both move laterally and cant up and down. To lift a loada separate line runs up and over the mast with a hook on its free endas with a crane . &#911 &#93&#912 &#93Derricks are especially useful for high-rise riggingjobs that cover a long period of timeor jobs when the impact to street or pedestrian traffic is a concern. &#913 &#934 &#935 &#93The derrick derives its name from a type of gallows named after Thomas Derrickan Elizabethan-era English executioner . &#916 &#93the boom point secured to the junction of the side members

1 Types Toggle Types subsection 1.1 A-frame 1.2 Basket 1.3 Breast 1.4 Chicago boom 1.5 Gin pole 1.6 Guy 1.7 Shearleg 1.8 Stiffleg 2 Oil derrick 3 Patent systems Toggle Patent systems subsection 3.1 Hallen 3.2 Velle 3.3 Stülcken 4 See also 5 References 6 Further reading 7 External links Toggle the table of contents Derrick 17 languages العربية Deutsch Ελληνικά Esperanto Español فارسی Français Gàidhlig Hrvatski Bahasa Indonesia Italiano 日本語 Norsk bokmål Português Română Русский سنڌي Edit links Art

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