arch head

American  

noun

Machinery.

1. 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.

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Example Sentences

These are extremely light, yet provided with six deep ribs under the arch head, greatly aiding the cooling of the piston as well as strengthening it.

From Project Gutenberg

If we cut the projection gradually down, we arrive at the common Gothic gable dripstone carried on small brackets, carved into bosses, heads, or some other ornamental form; the sub-arch in such case being useless, is removed or coincides with the arch head of the aperture.

From Project Gutenberg

But the arch head has a natural organism, which separates its ornament into distinct families, broadly definable.

From Project Gutenberg

The first and simplest mode of obtaining this is by channelling the jambs and arch head; and this is the chief practical service of aperture mouldings, which are otherwise entirely decorative.

From Project Gutenberg

I can like you now, and admire you too, sir, and say that you are brave, and very kind, and very true, and a fine gentleman for all—for all your little mishap at your birth,” says she, wagging her arch head.

From Project Gutenberg