How much will a jib crane deflect?
Contrx Industries manufactures its floor and wall mount jib cranes according to the design specifications and standards of the American Institute of Steel Construction and the Occupational Safety and Health Administration, as applicable. Cumulative boom deflection, or the distance toward ground that a fully loaded jib crane boom will displace, is a function not only of the boom beam size and moment of inertia, but also of the total column deflection, flexure in the base plate, distortion of the upper head assembly, and the method of anchoring. In order to accurately predict the amount of deflection possible in our product models, we randomly erect and test production units. Our empirical tests, coupled with static analyses of the units, indicate the following: For floor mount jib cranes with boom lengths of 10 feet or less, a cumulative deflection in the range of to 2-1/4 inches can be expected. For floor mount jib cranes with boom lengths of 11 to 20 feet, a cumulative deflection in t
