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A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
In sailing, a block is a single or multiple pulley. One or a number of sheaves are enclosed in an assembly between cheeks or chocks. In use, a block is fixed to the end of a line, to a spar, or to a surface. A line (rope) is reeved through the sheaves, and maybe through one or more matching blocks at some far end, to make up a tackle.
Experiments in India for double stacking using flatcars under 25 kV AC overhead lines set 7.45 m (24 ft 5 + 1 ⁄ 4 in) above rail have begun with funds given by Japan. [24] [25] [26] Australia - double-stacked trains operate between Perth, Adelaide, Darwin and Parkes, New South Wales [27] 6.5 m (21 ft 3 + 7 ⁄ 8 in) clearances. [28]
block A pulley with one or more sheaves or grooves over which a line is roved. It can be used to change the direction of the line, or in pairs used to form a tackle. [2] block, fiddle A block with two sheaves in the same plane, one being smaller than the other, giving the block a somewhat violin appearance. block, snatch
Clause 2 — The loading capacity of containers must be such that their total weight (load, plus tare) is: 5 tonnes (4.92 long tons; 5.51 short tons) for containers of the heavy type; 2.5 tonnes (2.46 long tons; 2.76 short tons) for containers of the light type; a tolerance of 5 percent excess on the total weight is allowable under the same ...
In 1963, there was the initial production of compact 4-cycle 40 kW (55PS) SD20 and 44 kW (60PS) SD22 diesel engines. 70 to 80-ton crane-carrier truck series were also introduced to the line-up. 1969 saw the introduction of 4-cycle 136 kW (185PS) PD6 and 99 kW (135 PS) ND6 diesel engines for heavy-duty vehicles.