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hammer (n.)
1.the ossicle attached to the eardrum
2.a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking
3.the act of pounding (delivering repeated heavy blows)"the sudden hammer of fists caught him off guard" "the pounding of feet on the hallway"
4.a power tool for drilling rocks
5.a striker that is covered in felt and that causes the piano strings to vibrate
6.the part of a gunlock that strikes the percussion cap when the trigger is pulled
7.a heavy metal sphere attached to a flexible wire; used in the hammer throw
8.a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc.
hammer (v. trans.)
1.beat with or as if with a hammer"hammer the metal flat"
2.create by hammering"hammer the silver into a bowl" "forge a pair of tongues"
hammer
1.teach by drills and repetition
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Merriam Webster
HammerHam"mer (hăm"mẽr), n. [OE. hamer, AS. hamer, hamor; akin to D. hamer, G. & Dan. hammer, Sw. hammare, Icel. hamarr, hammer, crag, and perh. to Gr. 'a`kmwn anvil, Skr. açman stone.]
1. An instrument for driving nails, beating metals, and the like, consisting of a head, usually of steel or iron, fixed crosswise to a handle.
With busy hammers closing rivets up. Shak.
2. Something which in form or action resembles the common hammer; as: (a) That part of a clock which strikes upon the bell to indicate the hour. (b) The padded mallet of a piano, which strikes the wires, to produce the tones. (c) (Anat.) The malleus. See under Ear. (d) (Gun.) That part of a gunlock which strikes the percussion cap, or firing pin; the cock; formerly, however, a piece of steel covering the pan of a flintlock musket and struck by the flint of the cock to ignite the priming. (e) Also, a person or thing that smites or shatters; as, St. Augustine was the hammer of heresies.
He met the stern legionaries [of Rome] who had been the “massive iron hammers” of the whole earth. J. H. Newman.
3. (Athletics) A spherical weight attached to a flexible handle and hurled from a mark or ring. The weight of head and handle is usually not less than 16 pounds.
Atmospheric hammer, a dead-stroke hammer in which the spring is formed by confined air. -- Drop hammer, Face hammer, etc. See under Drop, Face, etc. -- Hammer fish. See Hammerhead. -- Hammer hardening, the process of hardening metal by hammering it when cold. -- Hammer shell (Zoöl.), any species of Malleus, a genus of marine bivalve shells, allied to the pearl oysters, having the wings narrow and elongated, so as to give them a hammer-shaped outline; -- called also hammer oyster. -- To bring to the hammer, to put up at auction.
HammerHam"mer, v. t. [imp. & p. p. Hammered (-mẽrd); p. pr. & vb. n. Hammering.]
1. To beat with a hammer; to beat with heavy blows; as, to hammer iron.
2. To form or forge with a hammer; to shape by beating. “Hammered money.” Dryden.
3. To form in the mind; to shape by hard intellectual labor; -- usually with out.
Who was hammering out a penny dialogue. Jeffry.
HammerHam"mer, v. i.
1. To be busy forming anything; to labor hard as if shaping something with a hammer.
Whereon this month I have been hammering. Shak.
2. To strike repeated blows, literally or figuratively.
Blood and revenge are hammering in my head. Shak.
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⇨ voir la définition de Wikipedia
hammer (v.)
Voir aussi
hammer (n.)
↗ thud
⇨ Hammer Toe • Hammer Toe Syndrome • Hammer toe, congenital • Other hammer toe(s) (acquired) • Pneumatic hammer syndrome • air hammer • ball-peen hammer • bricklayer's hammer • bring under the hammer • carpenter's hammer • claw hammer • drop hammer • drop-hammer • ear's hammer • electric hammer • hammer and sickle • hammer drill • hammer home • hammer in • hammer nose • hammer out • hammer throw • hammer thrower • hammer-grab • hammer-headed fruit bat • hammer-shaped • ice-hammer • malleus hammer • north-wall hammer • pneumatic hammer • power hammer • sledge-hammer • tack hammer • tuning hammer • water hammer
⇨ 1983 World Championships in Athletics – Men's hammer throw • 1987 World Championships in Athletics – Men's hammer throw • 1990 European Championships in Athletics – Men's Hammer • 1991 World Championships in Athletics – Men's hammer throw • 1993 World Championships in Athletics – Men's hammer throw • 2005 World Championships in Athletics – Men's hammer throw • 2005 World Championships in Athletics – Women's hammer throw • 2007 World Championships in Athletics – Men's hammer throw • 2007 World Championships in Athletics – Women's hammer throw • A. J. Hammer • Abinger Hammer • Active Duty (MC Hammer album) • Air Hammer • Alfred Hammer • Anthony Hammer • Arm and Hammer • Armand Hammer • Armand Hammer United World College of the American West • Athletics at the 1900 Summer Olympics – Men's hammer throw • Athletics at the 1904 Summer Olympics – Men's hammer throw • Athletics at the 1908 Summer Olympics – Men's hammer throw • Athletics at the 1912 Summer Olympics – Men's hammer throw • Athletics at the 1920 Summer Olympics – Men's hammer throw • Athletics at the 1964 Summer Olympics – Men's hammer throw • Athletics at the 1988 Summer Olympics – Men's hammer throw • Athletics at the 1992 Summer Olympics – Men's hammer throw • Athletics at the 1996 Summer Olympics – Men's hammer throw • Baron Joseph von Hammer-Purgstall • Beatrice Hammer • Bernhard Hammer • Black Hammer Township, Houston County, Minnesota • Blood hammer • Bob Hammer • Body Hammer • Bonnie Hammer • Bush hammer • Caleb Hammer • Charles Christian Hammer • Charles Martel the Hammer • Christian Gottlob Hammer • Chuck Hammer • Colt Model 1903 Pocket Hammer • Creusot steam hammer • Crimson Cowl (Justine Hammer) • David Paul Hammer • Dead blow hammer • Dennis Hammer • Divine Hammer • Divine Hammer (song) • Edward E. Hammer • Ellen Hammer • Emergency hammer • Espen Hammer • Four Hammer Dulcimer • Geologist's hammer • Glass Hammer • Greatest Hits (MC Hammer album) • Grit Hammer • Hammer (Castlevania) • Hammer (automobile) • Hammer (comics) • Hammer (film) • Hammer (firearm) • Hammer (nickname) • Hammer (surname) • Hammer Bowling • Hammer Creek Bridge • Hammer Damage • Hammer DeRoburt • Hammer Film Productions • Hammer Film Productions Ltd. • Hammer Harrison • Hammer Heads • Hammer Hill • Hammer Horror • Hammer Horror (song) • Hammer House of Mystery and Suspense • Hammer Into Anvil • Hammer Museum • Hammer Museum (Haines, AK) • Hammer Smashed Face • Hammer SpVg • Hammer Stradivarius • Hammer Township, Yellow Medicine County, Minnesota • Hammer an der Uecker • Hammer and Anvil (comics) • Hammer and pick • Hammer and sickle • Hammer and sickle (disambiguation) • Hammer bite • Hammer blow • Hammer de Roburt • Hammer filmography • Hammer of God (album) • Hammer of the Gods • Hammer of the Scots • Hammer of the Scots (board game) • Hammer off • Hammer offs • Hammer og Hosanger • Hammer on a Drum • Hammer pants • Hammer piano • Hammer projection • Hammer tacker • Hammer throw • Hammer to Fall • Hammer v. Dagenhart • Hammer-Sommer • Hammer-headed bat • Hammer-on • Harlem Hammer (Wild Cards) • Harold Hammer Thompson • Heathcote Howard Hammer • Hebrew hammer • Helve Hammer • Homes Under the Hammer • If I Had a Hammer • If I Had a Hammer (Hercules) • If I Had a Hammer (disambiguation) • Jack Hammer • Jack Hammer (pornographic actor) • Jaime Hammer • Jan Hammer • Jay Hammer • Jeff Beck with the Jan Hammer Group Live • Jens Hammer • John Hammer • Joseph von Hammer • Joseph, Baron von Hammer-Purgstall • Justin Hammer • Kristian Alfred Hammer • Kristian Hammer • Lisa Hammer • List of Mickey Spillane's Mike Hammer (Stacy Keach) episodes • Lump hammer • M. C. Hammer • Marion Hammer • Marion P. Hammer • Master's Hammer • Meteor hammer • Michael Hammer • Mike Hammer • Mike Hammer, Private Eye • Nine Pound Hammer • Olav Hammer • Omar Hammer • Operation Hammer • Operation Hammer (1997) • Operation Hammer (Afghanistan) • Operation Iron Hammer • Operation Tiger Hammer • P. P. Hammer and his Pneumatic Weapon • Peter Hammer • Please Homer, Don't Hammer 'Em • Power hammer • Red hammer records • Reflex hammer • Ritual (Master's Hammer album) • Rotary hammer drill • Schmidt hammer • Screenless hammer mill • Sign of the Hammer • Stefan Hammer • Stonemason's hammer • Team Hammer House • Ten Ton Hammer • The Glass Hammer • The Hammer • The Hammer and the Cross • The Hammer of Eden • The Hammer of God • The Hammer of God (DeMille novel) • The Hits (MC Hammer album) • The Legend of John Henry's Hammer • The New Mike Hammer • The Snake (Mike Hammer) • Thor's Hammer (novel) • Thorr's Hammer • Tilt hammer • Time Bomb (Demolition Hammer album) • Upholstery hammer • Van Hammer • Victor Hammer • Vulcan's Hammer • Walter Schmidt (hammer thrower) • War hammer • Water Hammer Arrestor • Water hammer pulse • Watson's water hammer pulse • We Buy a Hammer for Daddy • William C. Hammer • William Hammer • William Joseph Hammer • Yellow Hammer • Zebulun Hammer • Zevulon Hammer • Zevulun Hammer • Zvulun Hammer
hammer
drill[Hyper.]
hammer (n.)
outil du forgeron (fr)[ClasseParExt.]
hammer[ClasseHyper.]
outil de menuiserie-charpenterie (fr)[ClasseParExt.]
objet fait pour casser (fr)[Classe]
(nail), (nail puller)[termes liés]
(cobble; surface; pave), (paving; pavage), (set; paving stone; paving-stone), (paving; pavage)[termes liés]
enfoncer (fr)[termes liés]
hand tool[Hyper.]
hammer, thud - forge, hammer, smith[Dérivé]
hammer (n.)
mouvement physique répété (fr)[Classe]
loudness; noisiness; racketiness[Classe]
hammer; pound; hammering; pounding[ClasseHyper.]
blow, crack, hit, stroke[Hyper.]
hammer, thud[Nominalisation]
pound - bang, bang at, bang on, poke, pound, pound at, pound on, thump, thump on - pound, ram, ram down[Dérivé]
hammer (n.)
power tool[Hyper.]
hammer (n.)
striker[Hyper.]
piano action[Desc]
hammer (n.)
arme à feu (fr)[DomainDescrip.]
hammer (n.)
sports equipment[Hyper.]
hammer (n.)
hammer (n.)
objet pour frapper (fr)[Classe]
piano (fr)[DomainDescrip.]
hammer (v. tr.)
flatten; shatter; mash; crush; squash; bang up; smash up; smash[Classe]
toucher rudement en portant des coups (fr)[Classe]
donner un (des) coup(s) de marteau (fr)[Classe]
forger (fr)[Classe]
(power; strength)[Caract.]
(go after; chase after; drive after; run after; follow), (train; cortege; retinue; suite; entourage)[Caract.]
hammer (v. tr.)
construct; fabricate; make; manufacture; turn out; produce[Classe]
donner un (des) coup(s) de marteau (fr)[Classe]
toucher rudement en portant des coups (fr)[Classe]
forger (fr)[Classe]
serrurerie (fr)[termes liés]
(iron; Fe; atomic number 26), (ferric; ferrous)[termes liés]
Wikipedia
A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving nails, fitting parts, forging metal and breaking up objects. Hammers are often designed for a specific purpose, and vary widely in their shape and structure. The usual features are a handle and a head, with most of the weight in the head. The basic design is hand-operated, but there are also many mechanically operated models for heavier uses, such as steam hammers.
The hammer may be the oldest tool for which definite evidence exists. Stone hammers are known which are dated to 2,600,000 BCE.[1][2]
The hammer is a basic tool of many professions. By analogy, the name hammer has also been used for devices that are designed to deliver blows, e.g. in the caplock mechanism of firearms.
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The use of simple tools dates to about 2,400,000 BCE when various shaped stones were used to strike wood, bone, or other stones to break them apart and shape them. Stones attached to sticks with strips of leather or animal sinew were being used as hammers by about 30,000 BCE during the middle of the Paleolithic Stone Age. Its archeological record means it is perhaps the oldest human tool known.
The essential part of a hammer is the head, a compact solid mass that is able to deliver the blow to the intended target without itself deforming.
The opposite side may have a ball, as in the ball-peen hammer and the cow hammer. Some upholstery hammers have a magnetized appendage, to pick up tacks. In the hatchet the hammer head is secondary to the cutting edge of the tool.
As the impact between steel hammer heads and the objects being hit can, and does, create sparks, which in some industries such as underground coal mining with methane gas, or in other hazardous environments containing flammable gases and vapours, can be dangerous and risk igniting the gases. In these environments, a variety of non-sparking metal tools are used, being principally, aluminium or beryllium copper-headed hammers.
In recent years the handles have been made of durable plastic or rubber. The hammer varies at the top; some are larger than others giving a larger surface area to hit different sized nails and such.
Popular hand-powered variations include:
Mechanically powered hammers often look quite different from the hand tools, but nevertheless most of them work on the same principle. They include:
In professional framing carpentry, the hammer has almost been completely replaced by the nail gun. In professional upholstery, its chief competitor is the staple gun.
A hammer is basically a force amplifier that works by converting mechanical work into kinetic energy and back.
In the swing that precedes each blow, a certain amount of kinetic energy gets stored in the hammer's head, equal to the length D of the swing times the force f produced by the muscles of the arm and by gravity. When the hammer strikes, the head gets stopped by an opposite force coming from the target; which is equal and opposite to the force applied by the head to the target. If the target is a hard and heavy object, or if it is resting on some sort of anvil, the head can travel only a very short distance d before stopping. Since the stopping force F times that distance must be equal to the head's kinetic energy, it follows that F will be much greater than the original driving force f — roughly, by a factor D/d. In this way, great strength is not needed to produce a force strong enough to bend steel, or crack the hardest stone.
The amount of energy delivered to the target by the hammer-blow is equivalent to one half the mass of the head times the square of the head's speed at the time of impact (). While the energy delivered to the target increases linearly with mass, it increases geometrically with the speed (see the effect of the handle, below). High tech titanium heads are lighter and allow for longer handles, thus increasing velocity and delivering more energy with less arm fatigue than that of a steel head hammer of the same weight. As hammers must be used in many circumstances, where the position of the person using them cannot be taken for granted, trade-offs are made for the sake of practicality. In areas where one has plenty of room, a long handle with a heavy head (like a sledge hammer) can deliver the maximum amount of energy to the target. It is not practical to use such a large hammer for all tasks, however, and thus the overall design has been modified repeatedly to achieve the optimum utility in a wide variety of situations.
The handle of the hammer helps in several ways. It keeps the user's hands away from the point of impact. It provides a broad area that is better-suited for gripping by the hand. Most importantly, it allows the user to maximize the speed of the head on each blow. The primary constraint on additional handle length is the lack of space in which to swing the hammer. This is why sledge hammers, largely used in open spaces, can have handles that are much longer than a standard carpenter's hammer. The second most important constraint is more subtle. Even without considering the effects of fatigue, the longer the handle, the harder it is to guide the head of the hammer to its target at full speed. Most designs are a compromise between practicality and energy efficiency. Too long a handle: the hammer is inefficient because it delivers force to the wrong place, off-target. Too short a handle: the hammer is inefficient because it doesn't deliver enough force, requiring more blows to complete a given task. Recently, modifications have also been made with respect to the effect of the hammer on the user. A titanium head has about 3% recoil and can result in greater efficiency and less fatigue when compared to a steel head with about 27% recoil. Handles made of shock-absorbing materials or varying angles attempt to make it easier for the user to continue to wield this age-old device, even as nail guns and other powered drivers encroach on its traditional field of use.
Gravity will exert a force on the hammer head. If hammering downwards gravity will increase the acceleration during the hammer stroke and increase the energy delivered with each blow. If hammering upwards gravity will reduce the acceleration during the hammer stroke and therefore reduce the energy delivered with each blow. Some hammering methods rely entirely on gravity for acceleration on the down stroke.
A war hammer is a late medieval weapon of war intended for close combat action.
The hammer, being one of the most used tools by Homo sapiens, has been used very much in symbols and arms. In the Middle Ages it was used often in blacksmith guild logos, as well as in many family symbols. The most recognised symbol with a hammer in it is the Hammer and Sickle, which was the symbol of the former Soviet Union and is very interlinked with Communism/Socialism. The hammer in this symbol represents the industrial working class (and the sickle the agricultural working class). The hammer is used in some coat of arms in (former) socialist countries like East Germany.
In Norse Mythology, Thor, the god of thunder and lightning, wields a hammer named Mjolnir. Many artifacts of decorative hammers have been found, leading modern practitioners of this religion to often wear reproductions as a sign of their faith.
Wooden mallet
Straight pane sledgehammer
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009) |
Wikimedia Commons has media related to: Hammers |
Look up hammer in Wiktionary, the free dictionary. |
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