Keywords: Stiffleg derrick.gif en A stiffleg derrick is a derrick similar to a guy derrick except that the mast is supported or held in place by two or more stiff members called stifflegs which are capable of resisting either tensile or compressive forces Sills are generally provided to connect the lower ends of the stifflegs to the foot of the mast date https //www osha gov/pls/oshaweb/owadisp show_document p_id 9832 p_table STANDARDS Occupational Safety Health Administration U S Department of Labor PD-USGov Uploaded with UploadWizard Derrick cranes |