Fig. B-1 | Fig. T-1 | Fig. R-1 |
Construction and Crane Blocks
Some of the most important considerations in your block requirements are:
| Fig. B-1 | Fig. T-1 | Fig. R-1 |
Unretouched Photograph of a section cut from a flame hardened McKissick sheave (etched 2 1/2 Minutes) (NH4)2S4O8). | THE SHEAVE Note the groove form with proper line support and gently rounded lips to prevent line chaffing when fleet angles etc. are present. Note the groove is completely machined to proper line size. Note the dense martensitic structure clearly outlined by the etch. This flame hardened surface in the wear area of the sheave always presents a smooth, uncorrugated, proper size groove face to the line. Sheaves 14" diameter and over flame hardened in groove to minimum 35 Rockwell "C'. Smaller sheaves can be flame hardened on special order. |
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ALL CRANE AND CONSTRUCTION BLOCKS CAN BE FURNISHED WITH:
| Swivel shackle, in selected capacities, with bronze thrust or roller thrust bearing. | Single hook in capacities to 300 tons. | Duplex swivel hook in standard capacities to 1,000 tons. Larger sizes available. (See Page 224) | Quad swivel hook from 200 tons and larger. |
