- Trip hammer
A trip hammer (alt. helve hammer) is a massive powered
hammer, usually raised by a camand then released to fall under the force of gravity. Historically, trip hammers were often powered by a water wheel, known to be used in Chinaas long ago as 20 AD, in Rome by the first century AD and in medieval Europeby the 12th century. During the Industrial Revolutionthe trip hammer fell out of favor and was replaced with the power hammer. Often multiple hammers were powered via a set of line shafts, pulleys and belts from a centrally located power supply.
In ancient China, the trip hammer evolved out of the use of the
pestle and mortar, which in turn gave rise to the treadle-operated tilt-hammer ( Pinyin: dui; Wade-Giles: tui).Needham, Volume 4, Part 2, 183.] The latter was a simple device employing a lever and fulcrum (operated by pressure applied by the weight of one's foot to one end), which featured a series of catches or lugs on the main revolving shaft as well.Needham, Volume 4, Part 2, 390.] This device enabled the labor of pounding, often in the decorticating and polishing of grain, and avoided manual use of pounding with hand and arm. Although historians assert that its origins may span as far back as the Zhou Dynasty(1050 BC–221 BC), the earliest texts to describe the device are the "Ji Jiu Pian" dictionary of 40 BC, Yang Xiong's text known as the " Fangyan" of 15 BC, as well as the "Xin Lun" written by Huan Tanabout 20 AD (during the usurpation of Wang Mang).Needham, Volume 4, Part 2, 184.] The latter book states that the legendary mythological king known as Fu Xiwas the one responsible for the pestle and mortar (which evolved into the tilt-hammer and then trip hammer device). Although the author speaks of the mythological Fu Xi, a passage of his writing gives hint that the waterwheel and trip-hammer were in widespread use by the 1st century AD in China (for Chinese metallurgywith water-power, see Du Shi)(Wade-Giles spelling):
"Fu Hsi invented the pestle and mortar, which is so useful, and later on it was cleverly improved in such a way that the whole weight of the body could be used for treading on the tilt-hammer (tui), thus increasing the efficiency ten times. Afterwards the power of animals—donkeys, mules, oxen, and horses—was applied by means of machinery, and water-power too used for pounding, so that the benefit was increased a hundredfold."Needham, Volume 4, Part 2, 392.]
With his description, it is seen that the out-of-date Chinese term for pestle and mortar (dui, tui) would soon be replaced with the Chinese term for the water-powered trip-hammer (Pinyin: shui dui; Wade-Giles: shui tui). The Han Dynasty scholar and poet
Ma Rong(79–166 AD) mentioned in one of his poems of hammers 'pounding in the water-echoing caves'. As described in the " Hou Han Shu", in 129 AD the official Yu Xugave a report to Emperor Shun of Hanthat trip hammers were being exported from Han China to the Western Qiangpeople by way of canals through the Qilian Mountains. In his "Rou Xing Lun", the government official Kong Rong(153–208 AD) remarked that the invention of the trip hammer was an excellent example of a product created by intelligent men during his own age (comparing the relative achievements of the sages of old). During the 3rd century AD, the high government official and engineer Du Yuestablished the use of combined trip hammer batteries (lian zhi dui), which employed several shafts that were arranged to work off one large waterwheel.Needham, Volume 4, Part 2, 393.] In Chinese texts of the 4th century, there are written accounts of men possessing and operating hundreds of trip hammer machines, such as the venerable mathematician Wang Rong (died 306 AD), Deng Yu (died 326 AD), and Shi Chong (died 300 AD), responsible for the operation of hundreds of trip hammers in over thirty governmental districts throughout China.Needham, Volume 4, Part 2, 392-393.] There are numerous references to trip hammers during the Tang Dynasty(618–907 AD) and Song Dynasty(960–1279), and there are Ming Dynasty(1368–1644) references that report the use of trip hammers in papermills of FujianProvince.Needham, Volume 4, Part 2, 394.]
Although Chinese trip hammers in China were sometimes powered by the more efficient vertical-set waterwheel, the Chinese often employed the horizontal-set waterwheel in operating trip hammers, along with recumbent hammers.Needham, Volume 4, Part 2, 391-392.] The recumbent hammer was found in Chinese illustrations by 1313 AD, with the publishing of Wang Zhen's "Nong Shu" book on ancient and contemporary (medieval) metallurgy in China.Needham, Volume 4, Part 2, 395.] There were also illustrations of trip hammers in an
encyclopediaof 1637, written by Song Yingxing(1587–1666).Song, 91-93.]
The main components for water-powered trip hammers -
water wheels, cams, and hammers - were already known in Hellenistic times. [Andrew Wilson: “Machines, Power and the Ancient Economy”, "The Journal of Roman Studies", Vol. 92. (2002), pp. 1-32 (22)] Ancient cams are in evidence in early water-powered automata from the third century BC. A passage in the " Natural History" of the Roman scholar Pliny (NH 18.97) indicates that water-driven pestles had become fairly widespread in Italyby the first century AD: "The greater part of Italy uses an unshod pestle and also wheels which water turns as it flows past, and a trip-hammer [mola] ".Andrew Wilson: “Machines, Power and the Ancient Economy”, "The Journal of Roman Studies", Vol. 92. (2002), pp. 1-32 (16)] These trip-hammers were used for the pounding and hulling of grain. Grain-pounders with pestles, as well as ordinary watermills, are also attested as late as the middle of the fifth century in a monasteryfounded by Romanus of Condatin the remote Juraregion, indicating that the knowledge of trip hammers continued into the early Middle Ages.
Apart from agricultural processing, archaeological evidence also strongly suggests the existence of trip hammers in Roman metal working. In
Ickhamin Kent, a large metal hammer-head with mechanical deformations was excavated in an area where several Roman water-mills and metal waste dumps have also been traced.
The widest application of trip hammers, however, seems to have occurred in Roman mining, where
orefrom deep veins was first crushed into small pieces for further processing. Here, the regularity and spacing of large indentations on stone anvils indicate the use of cam-operated ore stamps, much like the devices of later medieval mining.Barry C. Burnham: "Roman Mining at Dolaucothi: The Implications of the 1991-3 Excavations near the Carreg Pumsaint", "Britannia", Vol. 28 (1997), pp. 325-336 (333-335)] Such mechanically deformed anvils have been found at numerous Roman silver and gold mining sites in Western Europe, including at Dolaucothi( Wales), and on the Iberian peninsula, [J. Wahl: "Tres Minas: Vorbericht über die archäologischen Ausgrabungen im Bereich des römischen Goldbergwerks 1986/87", in H. Steuer and U. Zimmerman (eds): "Montanarchäologie in Europa", 1993, p.123-152 (141; Fig.19)] where the datable examples are from the 1st and 2nd century AD. [Andrew Wilson: “Machines, Power and the Ancient Economy”, "The Journal of Roman Studies", Vol. 92. (2002), pp. 1-32 (21, Fn.110)] At Dolaucothi, these trip-hammers were hydraulic-driven and possibly also at other Roman mining sites, where the large scale use of the hushing and ground sluicing technique meant that large amounts of water were directly available for powering the machines.Andrew Wilson: “Machines, Power and the Ancient Economy”, "The Journal of Roman Studies", Vol. 92. (2002), pp. 1-32 (21f.)] [M.J.T. Lewis: "Millstone and Hammer: the Origins of Water Power", (1997), Section 2]
hydropowered and wind powered trip hammers were used in the medieval Islamic world. In order to adapt water wheels and windmills for gristmilling purposes, cams were used for raising and releasing trip hammers to fall on a material. Watermills and windmills with trip hammers were used for grinding cornand other seeds to produce meals, and many other industrial uses such as fullingcloth, husking rice, papermakingin paper mills, pulping sugarcane, and crushing metalic ores before extraction. Donald Routledge Hill, "Mechanical Engineering in the Medieval Near East", "Scientific American", May 1991, pp. 64-69 ( cf. Donald Routledge Hill, [http://home.swipnet.se/islam/articles/HistoryofSciences.htm Mechanical Engineering] )]
Water-powered and mechanised trip hammers reappeared in medieval Europe by the 12th century. Their use was described in medieval written sources of
Styria(in modern-day Austria), written in 1135 and another in 1175 AD.Needham, Volume 4, Part 2, 379.] Both texts mentioned the use of vertical stamp mills for ore-crushing. Medieval French sources of the years 1116 and 1249 both record the use of mechanised trip hammers used in the forging of wrought iron. Like most ancient and medieval Chinese trip hammers of before and of their contemporary age, medieval European trip hammers by the 15th century were most often in the shape of the vertical pestle stamp-mill, although they employed more frequent use of the vertical waterwheel than earlier Chinese versions (which often used the horizontal waterwheel). The well-known Renaissanceartist and inventor Leonardo de Vincioften sketched trip hammers for use in forges and even file-cutting machinery, those of the vertical pestle stamp-mill type. The oldest depicted European illustration of a martinetforge-hammer is perhaps the Historia de Gentibus Septentrionalibusof Olaus Magnus, dated to 1565 AD. In this woodcut image, there is the scene of three martinets and a waterwheel working wood and leather bellows of the Osmund bloomeryfurnace. Although illustrated in China beforehand in the early 14th century, the recumbrent hammer was first depicted in artwork of Europe by the 17th century, in an illustration by Sandrartand Zonca(dated 1621 AD).
Types of trip hammers
Trip hammers were of three kinds. All require artificial power to lift them:
*The tail helve hammer or 'tilt hammer' has a pivot at the centre of the helve on which it is mounted, and is lifted by pushing the opposite end to the head downwards. In practice the head on such hammers seems to have been limited to one hundredweight (about 50 kg), but a very rapid stroke rate was possible. This made it suitable for drawing iron down to small sizes suitable for the cutlery trades. There were therefore many such forges known as 'tilts' around
Sheffield. They were also used in brassbattery works for making brass (or copper) pots and pans. In battery works (at least) it was possible for one power source to operate several hammers.
*The belly helve hammer was the kind normally found in a
finery forge, used for making pig ironinto forgeable bar iron. This was lifted by cams striking the helve between the pivot and the head. The head usually weighted quarter of a ton. This was probably the case because the strain on a wooden helve would have been too great if the head were heavier.
*The nose helve hammer seems to have been unusual until the late 18th or early 19th century. This was lifted beyond the head.
The choice of which kind should be used in a particular context may depend on the strain that its operation imposed on the helve. This was normally of wood until the 19th century. Surviving nosehelves [For example at
Abbeydale Industrial Hamlet] and those in pictures [For example in the metalwork gallery in Birmingham Museum and Art Gallery] appear to be of cast iron. This was replaced by James Nasmyth's steam-powered drop hammer (invented in 1839 and patented in 1842. However the forge had become less important following the improvements to the rolling millthat went along with the adoption of puddling from the end of the 18th century.
*Andrew Wilson: "Machines, Power and the Ancient Economy", "The Journal of Roman Studies", Vol. 92. (2002), pp. 1-32 (16, 21f.)
*Barry C. Burnham: "Roman Mining at Dolaucothi: The Implications of the 1991-3 Excavations near the Carreg Pumsaint", "Britannia", Vol. 28 (1997), pp. 325-336 (333-335)
*M.J.T. Lewis: "Millstone and Hammer: the Origins of Water Power" (1997)
*Needham, Joseph (1986). "Science and Civilization in China: Volume 4, Part 2". Taipei: Caves Books Ltd.
*Song, Yingxing, translated with preface by E-Tu Zen Sun and Shiou-Chuan Sun (1966). "T'ien-Kung K'ai-Wu: Chinese Technology in the Seventeenth Century". University Park: Pennsylvania State University Press.
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Look at other dictionaries:
Trip hammer — Trip ham mer A tilt hammer. [1913 Webster] … The Collaborative International Dictionary of English
trip hammer — noun A tilt hammer • • • Main Entry: ↑trip … Useful english dictionary
trip-hammer — I. ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun : a massive power hammer having a helve that is tripped and allowed to fall by cam or lever action II. adjective : resembling or held to resemble the action of a trip hammer especially in being characterized by repeated… … Useful english dictionary
trip-hammer — I. noun Date: 1781 a massive power hammer having a head that is tripped and allowed to fall by cam or lever action II. adjective Date: 1846 suggesting a trip hammer in loud pounding or persistent action … New Collegiate Dictionary
trip hammer — noun a large, heavy pivoted hammer used in forging … English new terms dictionary
trip-hammer — n. Tilt hammer, tilt … New dictionary of synonyms
trip hammer — noun A powered machine used in a forge which repeatedly strikes work placed on an anvil … Wiktionary
trip-hammer pulse — Corrigan p … Medical dictionary
Hammer — A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving nails, fitting parts, and breaking up objects. Hammers are often designed for a specific purpose, and vary widely in their shape and structure. Usual … Wikipedia
trip — v. & n. v.intr. & tr. (tripped, tripping) 1 intr. a walk or dance with quick light steps. b (of a rhythm etc.) run lightly. 2 a intr. & tr. (often foll. by up) stumble or cause to stumble, esp. by catching or entangling the feet. b intr. & tr.… … Useful english dictionary