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.
Learn more about Frothed Foam. The newest example of this type of pad is made by Shaw Industries Inc. out of Dalton GA. Here are the specs in more detail about this type of cushion. Type: MFCB A Hi-Density Machanically Frothed Chemically Blown Micro Closed Cell Foam Cushion.