[Illustration: Figures 5_a-c_, 8_a_, 9_a_, 10-12
MANUFACTURE OF WELDLESS CHAINS.]
In the manufacture of chains by the aforesaid process of punching
there is a practical minimum limit for the dimensions of the punches
which cannot be reduced without compromising their efficiency, and
consequently the width (and therefore the length) of the link must
necessarily bear a certain proportion to the thickness of the web of
metal out of which it is formed, since the breadth of the link depends
on the length of the cross stay, which is determined by the breadth of
the mortises forming the eyes of the link. The present modification
enables these dimensions to be reduced without reducing the
dimensions, and consequently the efficiency, of the punches which form
the eyes of the link. The modification applies to what I have
designated the fifth operation of the above described process; and it
consists in punching out the middle of the cross stay (so as to leave
only two short stumps jutting inward from the side members of the
link), this operation serving to interrupt the continuity of the core,
which was the object of the fifth operation. For this purpose I
substitute for the pair of punches illustrated in Figs.
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