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Trip-ham′mer.

A hammer tripped on its axis by the contact of cam, wiper, or tooth with the tail of the helve.

The annexed cut is perhaps the earliest illustration of the trip-hammer movement. It is from the “Automata” of Hero, who lived 150 B. C. The cut is reduced from a curious folio edition of his works published in Paris, 1693; a copy is in the Patent Office library.

Trip-hammer.

The old French form, the marteau frontal, was lifted by projecting arms fixed in a cam ring and falling through a certain space by its own gravity. The tilt-hammer which succeeded it, instead of being raised at the front, had its tail depressed by a cam in the rear. Various modifications were known, as the tennant-helve and the belly-helve, but the steam-hammer and various forms of drop and dead-stroke are rapidly superseding the pivoted helve. See list under hammer; see also tilt-hammer.

The Cubberly trip-hammer shown at the Chicago Exposition, 1875, is said to run 200 strokes per minute, giving blows of any degree of intensity.

1877.

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