Boom and counter boom of the crane 2.13 Trolleys for the movement of the load m 1 and counterweight m2. The trolley shown in Fig. 13, consists of a chassis or metal base and four wheels which are to move into two rails. The rails that belong to the boom are longer than those of the counter boom.
Water easily passes though this EZ-Dry polyurethane foam. * Outdoor furniture such as seat and back cushions and mattresses. * Boat or marine cushions, golf carts, pool, patio or grading cushions. * Can also be used under Phifertex material and for filtering or padding whatever is exposed to large amounts of water.
In addition to the flexible and rigid types, semi-flexible polyurethane foam also exists, and is used extensively in automobile interiors. Seats, armrests, and headrests are frequently made from the semi-flexible variety of this material.t can be flexible or rigid, but has a low density. Flexible polyurethane foam is most often used in bedding and upholstery, while the more rigid variety is used for thermal insulation and in automobile dashboards.