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

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 The Stones of Venice, Volume I (of 3) by Ruskin, John

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 Aviation Engines Design?Construction?Operation and Repair by Pag?, Victor Wilfred

The arch head is ogee-shaped outside, with large external, and smaller, but not less rich, internal crockets.

From Bell's Cathedrals: The Cathedral Church of Rochester A Description of its Fabric and a Brief History of the Episcopal See by Palmer, G. H. (George Henry)

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

From The Stones of Venice, Volume I (of 3) by Ruskin, John