tilt hammer

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A heavy forge hammer having a pivoted lever by which it is tilted up and then allowed to drop.

Century Dictionary and Cyclopedia

1. n. In mech., a power machine-tool for hammering, forging, etc. It is a development from the trip-hammer, and, though for large work it has been superseded by the steam-hammer, and for light work by drop-presses and drop-hammers, it is still used in shovel-making and other light forging. It consists essentially of a lever of the first or third order, and is operated by a cam-wheel or eccentric, the hammer being placed at the end of the longer arm of the lever. One type, known as the cushioned hammer, is fitted with rubber cushions to prevent jarring and noise. See triphammer.

Wiktionary

1. n. A tilted hammer; a heavy hammer, used in ironworking, lifted or tilted by projections or wipers on a revolving shaft; a trip hammer.

GNU Webster's 1913

1. A tilted hammer; a heavy hammer, used in iron works, which is lifted or tilted by projections or wipers on a revolving shaft; a trip hammer.