Arch head

a vertical, arc-shaped member fixed to the end of a walking beam, for supporting a chain from which a pump rod or the like is suspended in such a way as to let it rise and fall vertically.
historical examples

a chain from the piston-rod to the arch head, as described in the single-acting engine, would fail to transmit this force.
the steam engine explained and ill-strated (seventh edition) dionysius lardner

but the arch head has a natural organism, which separates its ornament into distinct families, broadly definable.
the stones of venice, volume i (of 3) john ruskin

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