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This table also lists "Modified Straight Concaves." These are con¬caves having a lesser curve at the bot¬tom partly approaching the non-chok¬ing con caves but having the choke¬point at the bottom of the chamber. They are used where the open-side set¬ting is large enough to permit the use of straight concaves, but where some of the advantages of non-choking con¬caves are desired. These include in¬creased capacity, more uniform sizing and the distribution of wear to pre¬vent "belling" of the head.
It should be made clear at this point that these concaves, although they bear the title of "non-choking," do not afford absolute insurance against choking. In that respect the title is perhaps a trifle misleading. The very fact that a choke-point exists at all within the crushing chamber makes it evident that choking can occur. On the other hand, they do minimize the danger of choking, and their general characteristics are such that their de-scriptive title is not too far afield. |
