Knife

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A knife ( plural blade ) is a tool with a cutting edge or a knife, held by hand or vice versa, with most having a handle. Some types of knives are used as tools, including knives used at the dining table (eg butter knife and steak knife) and knives used in the kitchen (for example, peel knives, bread knives, machetes). Many types of knives are used as tools, such as combat knives carried by soldiers, pocket knives carried by pedestrians and hunting knives used by hunters. Knives are also used as traditional or religious tools, such as kirpan. Some types of knives are used as weapons, such as a dagger or a folding knife. Some types of knives are used as sports equipment (for example, throwing a knife). Knives are also used in agriculture, food crops etc.; sickle, crescent and even a combined harvest is a knife.

A tool like a knife was used at least two and a half million years ago, as evidenced by the Oldowan tool. Originally made of stone, bone, flint, and obsidian, the blades have evolved in such technological constructions, with blades made of bronze, copper, iron, steel, ceramics, and titanium. Many cultures have their unique blade versions. Because of its role as the first tool of man, certain cultures have attached spiritual and religious significance to the knife.

Most modern knives follow a fixed style or folding construction, with patterns of blades and styles as diverse as the makers and their home countries. The word knife may be derived from the old Norse word knifr for the knife.

Video Knife

Section

Modern knives consist of:

1. blade
2. handle
3. point - the tip of the blade used to pierce
4. the edge - the cutting edge of the blade extends from point to heel
5. grind - cross-sectional form of the blade
6. spine - the thickest part of the blade; on one-edged blade, side opposite to edge; on a double-edged knife, more towards the middle
7. which is more complete - grooves are added to make the knife brighter
8. ricasso - the flat part of the knife located at the intersection of the knife and roller blade or guard
9. guard - barrier between the blade and the handle that prevents the hand slipping forward to the blade and protecting the hands of the external force normally applied to the blade when used
10. hilt - the end of the handle is used for blunt style
11. lanyard - a rope used to secure a knife to the wrist

The edges of the blades can be plain or jagged, or a combination of both. A one-edged knife may have an inverted edge of the spine. This edge is usually jagged and is used to improve further function.

The handle, used for holding and manipulating the blades safely, may include a pliers, the part of the blade that extends into the handle. The blades are made with partial stimuli (end to handle, known as "stick tangs") or full stimulation (extending the full length of the handle, often seen above and below). The handle may include bolsters, a piece of heavy material (usually metal) located on the front or back of the handle. The guling, as the name implies, is used to mechanically strengthen the blades.

Blade

Knives can be made from various materials, each of which has advantages and disadvantages. Carbon steels, iron and carbon alloys, can be very sharp. It holds the edges well, and remains easy to sharpen, but is vulnerable to rust and stains. Stainless steel is an alloy of iron, chromium, perhaps nickel, and molybdenum, with only a small amount of carbon. It is not capable of taking sharp sharp like carbon steel, but it is very resistant to corrosion. High carbon stainless steels are stainless steels with higher amounts of carbon, intended to combine better attributes of carbon steel and stainless steels. High carbon carbon steel blades do not darken or stain, and retain sharp edges. The laminate blades use several metals to create layered sandwiches, combining both attributes. For example, harder and more brittle steels can be sandwiched between a softer, harder, stainless steel layer to reduce the vulnerability to corrosion. In this case, the part that is most affected by corrosion, edges, is still vulnerable. Pattern-welding is similar to laminate construction. Different layers of steel types are welded together, but then the stock is manipulated to create patterns in steel.

Titanium is a metal that has a better strength-to-weight ratio, is more wear resistant, and more flexible than steel. Though less hard and incapable of sharp cutting, carbides in titanium alloys allow them to be heat treated with sufficient hardness. Ceramic blades are hard, brittle, and light: they can retain sharp edges for years without any care, but they are as fragile as glass and will break if they fall on a hard surface. They are immune to general corrosion, and can only be honed on silicon carbide sandpaper and some grinding wheels. Plastic blades are not too sharp and usually jagged. They are often disposable.

Steel blades are usually formed by forging or removing stock. The forged blades are made by heating a piece of steel, then forming metal during heat using a hammer or press. The stock removal knife is formed by grinding and removing the metal. With both methods, after forming, the steel must be heat treated. This involves warming steel above its critical point, then extinguish the bar to harden it. Once hardened, the blades are forged to remove the pressure and make the blades become harder. Mass kitchen cutlery is produced using the forging and removal process. Forging is likely to be provided for more expensive product line manufacturers, and can often be distinguished from stock removal product lines by the presence of integral rolls, although integral rolling can be made through the method of formation.

Knives are honed in various ways. The flat ground bar has a profile that shrinks from the thick spine to the sharp edge in a straight line or convex. Seen in a cross section, the blade will form a long, thin triangle, or where the taper does not extend to the back of the blade, a long thin rectangle with one side peaking. Hollow ground knives have concave, sloping edges. The resulting blade has a thinner edge, so it may have better cutting capability for shallow cuts, but is lighter and less durable than a flat ground knife and will tend to bind in cuts. The serrated knife blade has a wavy blade, toothed or like a saw. Jagged blades are better suited for tasks requiring aggressive 'sawing' movements, whereas ordinary edge blades are better suited for tasks that require cutting through scanning (for example, shaving, cutting, slicing).

Blade fixed features

A fixed blade knife, sometimes called a sheath blade, does not fold or glide, and is usually stronger due to pliers, extension of the knife to the handle, and the lack of moving parts.

Flat fold feature

The folding knife connects the blade to the handle through the pivot, allowing the blade to fold into the handle. To prevent injury to blade users through a knife inadvertently closing the user's hand, a folding knife usually has a locking mechanism. Different locking mechanisms are favored by various individuals for reasons such as perceived power (key safety), legality, and ease of use. Popular locking mechanisms include:

• Slip joint - Most commonly found in traditional pocket knives, open blades do not lock, but are held by a spring device that allows the blades to fold if a certain amount of pressure is applied.
• Locks - Also known as spine locks , locks include winding hooks attached to springs, and can be removed simply by pressing the lock down to release the blade.
• Linerlock - Created by Michael Walker, Linerlock is a folding knife with a side spring lock that can be opened and closed with one hand without repositioning the knife in hand. The key itself adjusts to wear.
• Compression Key - Variant of Liner Lock, it uses a small piece of metal at the key end to lock into a corresponding small impression on the blade. This creates a key that does not release when the blade is burned, instead of being locked more tightly. It is released by pressing the metal tab sideways, to allow the blade to be placed into the groove set to the handle.
• Frame Lock - Also known as integral key or monolock , this locking mechanism was invented by the special blade maker Chris Reeve for Sebenza as an update for lock liner. The frame lock works in a way similar to a liner lock but uses a partial cut of the actual blade handle, rather than a separate liner inside the handle to hold the blade in place.
• Lock collar - found on the Opinel blade.
• Buttons - Found mainly on automatic blades, this type of lock uses a small button to open and release the knife.
• Axis Lock - A locking mechanism that is exclusively licensed to the Benchmade Knife Company. The cylinder pad is tightened in such a way that it will jump between the blades and some grip features to lock the open bar.
• Arc Lock - A locking mechanism that is exclusively licensed to SOG Speciality Knives. This differs from axis locks in that the cylindrical bearing is fastened by a rotary spring rather than an axial spring.
• Ball Bearing Lock - A locking mechanism that is exclusively licensed to Spyderco. This key is conceptually similar to the axle and bow lock but the pads are ball bearings.
• Tri-Ad Lock - A locking mechanism licensed exclusively to Cold Steel. This is a lockback form that incorporates a thick steel retaining pin between the front of the hook and the back of the forceps to transfer the power from the blade to the handle.
• PickLock - A round post on the back of the base of the blade is locked into the hole in the spring tab in the handle. To close, lift manually (select) spring tab (key) from the blade with your fingers, or in "Stiletto Italian Styles" rotate the bolt (hand protector) clockwise to lift the spring tab from the tip of the knife.

Another feature that stands out in many folding knives is its opening mechanism. Traditional pocket knives and Swiss Army knives typically use nickel nicks, while modern folding knives often use males, holes, disks, or fins located on the knives, all of which have the benefit of allowing the user to open the knife with one hand.

The "wave" feature is another prominent design, which uses part of the blade protruding out to catch in someone's pocket when stretched, thus opening the blade; is patented by Ernest Emerson and is not only used on many Emerson knives, but also on knives produced by several other manufacturers, especially Spyderco and Cold Steel.

Automatic knife or switchblade opens using stored energy from the released spring when the user presses a button or lever or other actuator attached to the handle of the blade. Automatic knives are severely restricted by law in the UK and most countries of America.

The more common is the assisted blades that use springs to push the blades after the user moves them over a certain angle. This is different from automatic knife or a folding knife in a knife that is not released by means of a button or grasping the handle; instead, the sword itself is an actuator. Most enthusiasts are helped to use the fins as their opening mechanism. The opening of the assisted blades can be as fast as or faster than the automatic knife to use.

General locking mechanism

In the lock back , as with many folding knives, the pin stops working on top (or behind) the blade prevents it from spinning clockwise. Hooks on knife pliers move with a hook on the rocker bar that prevents the blades from spinning counter-clockwise. The rocker bar is positioned by the torsional bar. To release the knife, the rocker bar is pressed down as shown and rotates around the rocker pin, lifting the hook and freeing the blade.

When the negative pressure (pressing the spine) is applied to the blade, all the pressure is transferred from the hook on the knife pliers to the hook on the rocker bar and then to the small rocker pin. Excessive stress can move one or both of these hooks to make the knife useless effectively. The Cold Steel knife uses a key back variant called Tri-Ad Lock which introduces the pin in front of the rocker bar to relieve stress on the rocker pin, having a longitudinal hole around the rocker pin. to allow the mechanism to be worn from time to time without loss of strength and angle of the hook so that the face no longer meets vertically.

The bolt on the bolt lock is a rectangle of metal that is restricted to just slide back and forth. When the blade opens the spring, separate the bolt into the front position where it is above the blade pliers that prevent the blade closing. The small buttons extend through the blade handle on both sides allowing the user to slide the bolt backwards to free the blade to close. The Axis Lock used by the Benchmade knife maker is functionally identical to the bolt lock except that it uses a cylinder rather than a rectangle to trap the blade. The Arc Lock by the SOG blade maker is similar to Axis Lock unless the cylinder follows a curved path rather than a straight line.

In the liner lock , a split "L" shaped in the liner allows part of the liner to move sideways from the rest position against the handle to the center of the blade where it rests on the flat end of the pliers. To escape, the leaf spring is pressed so that it once again rests on the handle allowing the blades to spin. The frame key is functionally identical but instead uses a thinner liner inside the handle material using thicker metal parts because the handle and the same part allow the frame portion to press the pliers.

Slide blade feature

A sliding knife is a knife that can be opened by sliding the knife to the outside of the handle. One method of opening is where the blade exits from the front of the first-point handle and then locks into place (this example is a gravity knife). Another form is the O-T-F (out-the-front) switchblade, which requires only keystrokes or springs to cause the blade to shift out of the handle and lock in place. To retract the knife to the handle, release lever or button, usually the same control when open, pressed. A very common form of a sliding knife is a sliding utility knife (commonly known as a stanley blade or boxcutter).

Handle

Knife handles can be made from a number of different materials, each of which has advantages and disadvantages. The grip is produced in various shapes and styles. The handle is often textured to increase the grip.

• Wood grips provide a nice and warm grip on the hand, but are harder to treat. They do not hold water well, and will crack or warp with prolonged contact with water. Modern stable and laminated wood has overcome most of these problems. A lot of beautiful and exotic hardwoods are used in custom manufacturing and some production knives. In some countries, it is now prohibited to use commercial butcher knives to hold the wooden handle, for hygiene reasons.
• Plastic handles are easier to treat than wooden handles, but they can be slippery and become brittle over time.
• Injection molds made from higher grade plastics consist of polypropalamalamalam, and when marketed under trademark names such as Zytel or Grivory , reinforced by Kevlar or fiberglass. These are often used by large knife manufacturers.
• Rubber handles like Kraton or Resiprene-C are generally preferred over plastic because of their durability and bearings.
• Micarta is a popular ingredient in the knife user because of its toughness and stability. Micarta is almost waterproof, is grippy when it gets wet, and is an excellent insulator. Micarta has come to refer to the fibrous material that is thrown on the resin. There are many types of micarta available. One of the most popular versions is a fiberglass-impregnated resin called G-10.
• The leather handle is seen on some hunting and military knives, especially KA-BAR. Leather handles are usually produced by stacking leather washing machines, or more commonly, as arms surrounding other grip materials. Russian producers often use birchbark in the same way.
• Skeleton handles refer to the practice of using the pliers themselves as a handle, usually with parts of the material removed to reduce weight. Skeleton handled blades often wrapped with parachute cables or other wrapping materials to enhance the grip.
• Stainless steel and aluminum handle are durable and clean, but can be slippery. To overcome this, the premium blade maker makes a handle with bulge, bulge, or indentation to give extra grip. Another problem with a knife that has a metal handle is that, because the metal is an excellent heat conductor, this knife can be very uncomfortable, and even painful or dangerous, when handled without gloves or other protective goggles in (very) cold climates. li>

More exotic materials usually only seen in art or ceremonial knives include: Stone, bones, mammoth teeth, mammoth ivory, oocic (walrus penis), walrus tusks, horns (often called deer in the context of knives), sheep's horns, buffalo horns, teeth, and mop (mother of pearl or "pearl"). Many materials have been used in knife handles.

The handle can be adjusted to accommodate the needs of PwDs. For example, the handle of a knife can be made thicker or with more pads for people suffering from arthritis in their hands. Non-slip handles accommodate people with palmar hyperhidrosis.

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Type

Weapon

As a weapon, the blades are universally adopted as an important tool. This is an important element of knife fight. As an example:

• Ballistic blades : A custom blade with a detachable gas or firebox that can be fired at a distance of several meters or meters by pressing the trigger or turning on the handle.
• Bayonet : A knife-shaped melee weapon designed to adhere to a rifle's muzzle or similar weapon.
• Butterfly knife : A folding knife also known as "balisong" or "batangas" with two counter-rotating handle where the blade is hidden inside the groove on the handle.
• Knife knives : Each knife is intended for use by soldiers in the field, as a means of general use, but also for combat.
• Dagger : A double-edged knife with the middle spine and the edges sharpening their full length, used primarily for stabbing. Variations include Stiletto and Dagger Push. See Dagger list for a more detailed list.
• Against a knife : Knife with knife designed to inflict deadly injury in physical confrontation between two or more individuals at very short distances (wrestling distance). Notable examples include Bowie knives and Fairbairn-Sykes Knives.
• Karambit : A blade with a curved blade resembling a tiger's claw, and a handle with one or two safety holes.
• Interfaces : The Indian gravity knife has a one-eyed blade with a length of about 9 to 12 inches.
• Shiv : Homemade knives made from everyday materials, especially in prison among prisoners. Alternate names in some prisons are shank .
• Throwing knives : Knives that are designed and weighted to be thrown.
• Ditch knives : Artificial or improvised blades, intended for close combat, especially in trench warfare; some have d-shaped integral hand shields.

Sports equipment

• Throwing knives : Knives that are designed and weighted to be cast.

Tools

The main aspects of the knife as a tool including feeding, are used either in food preparation or as a cutlery. Examples include:

• Bread knife : Knife with a serrated knife to cut bread
• Knife horn : Knife used to remove bones of poultry, meat and fish.
• Meat Knives : Knives designed and used primarily for slaughter and/or animal dressing.
• Carving knives : Knives for carving large ripened meats such as poultry, roasts, ham
• Chef knives : Also known as French knives, cutting tools used for preparing food
• Cleaver : A large blade that varies in shape but usually resembles a square bladed ax. It is used mostly to hack through bones as kitchen knives or meat knives, and can also be used to smash through the broad side, usually garlic.
• Power blades : An electrical device composed of two serrated blades that are clipped together, providing sawing action when turned on
• Kitchen knives : Any knives, including cooking knives, intended for use in food preparation
• Oyster knives : Have a short thick knife to pry open oyster skin
• Mezzaluna : Two-handed arc blades used in rocking movements as herbal chopper or for cutting other foods
• Paring or Coring Knife : A knife with a small but sharp knife used to cut the core of the fruit.
• The Rocker Knife is a cutting blade with a rocking motion, which is mainly used by people with disabilities preventing them from using forks and knives simultaneously.
• Table knife or case knife : A piece of cutlery, butter knife, steak knife, or both, which is part of the table arrangement, accompanying the fork and spoon

Tools

Knives play an important role in some cultures through ritual and superstition, because knives are an essential tool for survival since early humans. Knife symbols can be found in various cultures to symbolize all stages of life; for example, a knife placed under the bed during labor is said to ease the pain, or, stick to the head of the crib, to protect the baby; knives are included in some Anglo-Saxon burial rites, so that the dead will not be empowered in the next world. Knives play an important role in several initiation ceremonies, and many cultures perform rituals with various knives, including animal sacrifice ceremonies. The Samurai warriors, as part of bushido, can commit suicide rituals, or seppuku, with tant ?, a common Japanese knife. An athame, a ceremonial knife, is used in Wicca and derives from neopagan magic forms.

In Greece, a black knife placed under a pillow is used to ward off a nightmare. As early as 1646 the reference was made to the superstition putting the knife on the other part of the cutlery into a witchcraft sign. The common belief is that if a knife is given as a reward, the relationship of the giver and the recipient will be terminated. Something like a small coin, dove or valuables exchanged with a gift, rendering "payment."

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Legislation

Knives are usually limited by law, although the restrictions vary greatly by country or state and type of knife. For example, some laws prohibit the carrying of a knife in public while other laws prohibit private ownership of certain knives, such as folding knives.

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See also

• Arbelos, a geometric figure named after the shoemaker blade
• Dirk
• Fight the blade
• List of culinary blades
• List of knives
• Sword
• Zombie Knives

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References

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Further reading

• The Bible Knives Everyone by Don Paul, ISBNÃ, 0-938263-23-4

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External links

• American Knives & amp; Tool Institute
• Interactive steel knife database and comparison chart builder

Source of the article : Wikipedia