arch head

noun Machinery.
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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Arch head windows are features of the projecting bay.
The cornice visually supports a two-story recessed area with a round-arch head.
The cornice visually supports a two-story recess with a round-arch head.
The arch is topped with a brick rounded arch head with a brick keystone.
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