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 general, MOST foam play flooring / mats are made with a material called EVA (ethylene vinyl acetate) which is a foam rubber compound. For a while now it has been viewed as a healthier alternative to PVC and the process of making it excludes the use of chlorine which can produce carcinogenic compounds called dioxins.