A late-20th-century can opener with a rotating cutting wheel and a counter-rotating serrated wheel, for left-handed use
A can opener (North American and Australian English) or tin opener (British English) is a mechanical device used to open metaltin cans. Although preservation of food using tin cans had been practiced since at least 1772 in the Netherlands, the first can openers were not patented until 1855 in England and 1858 in the United States. These early openers were basically variations of a knife, though the 1855 design continues to be produced.
The can opener consisting of the now familiar sharp rotating cutting wheel that runs round the can's rim to cut open the lid was invented in 1870, but was considered very difficult to operate for the ordinary consumer. A more successful design came out in 1925 when a second, serrated wheel was added to hold the cutting wheel on the rim of the can. This easy-to-use design has become one of the most popular can opener models.
Around the time of World War II, several can openers were developed for military use, such as the American P-38 and P-51. These featured a robust and compact design with a pull cutting blade hinged to a corrugated handle with a pivot. Electric can openers were introduced in the late 1950s and met with success. The development of new can opener types continues with a recent redesign of a side-cutting model.
Invention of cans
Peach can, September 5, 1856
Food preserved in tin cans was in use by the Dutch Navy from at least 1772.[1] Before 1800, there was already a small industry of canned salmon in the Netherlands. Freshly caught salmon were cleaned, boiled in brine, smoked and placed in tin-plated iron boxes. This canned salmon was known outside the Netherlands, and in 1797 a British company supplied one of their clients with 13 cans. Preservation of food in tin cans was patented by Peter Durand in 1810. The patent was acquired in 1812 by Bryan Donkin, who soon set up the world's first canning factory in London in 1813.
"Simplex" can sealing machine
By 1820, canned food was a recognised article in Britain and France and by 1822 in the United States.[1] The first cans were robust containers, which weighed more than the food they contained and required ingenuity to open, using whatever tools available. The instruction on those cans read "Cut round the top near the outer edge with a chisel and hammer."[2][3] The gap of decades between the invention of the can and can opener may be attributed to the functionality of existing tools versus the cost and effort of a new tool.[4]
Twist-key can-opener
A can opener's twist keyTwist key can opener in use
Also called tin can key can-opener.[5] During the 1800s,[6] the canning process was mechanised and refined, with can walls becoming thinner. The twist-key can-opener was patented by J. Osterhoudt in 1866.[7] There still was no general-purpose can-opener, thus each can came with a spot-welded or soldered-on twist-key can-opener which snapped off after fatiguing the metal by bending at a thin region. Each food-type had its own can-type, and came with its own can-opener-type. Tinned fish and meat were sold in rectangular cans. These cans were fitted with a twist-key that would roll around the top of the can, peeling back a pre-scored strip.[8] Coffee,[9] beans, and most other types of meat were packaged in cylinders with metal strips that could be peeled back with their own kinds of built-in keys that would roll around the top of the can.[10] Cans of milk used puncture devices.[6]
Lever-type can openers
Lever-type can opener design of 1855 by Robert YeatesBull-head push-lever-type can opener of 1865Lever-type can opener design of 1858 by Ezra Warner
General-purpose can openers first appeared in the 1850s and had a primitive claw-shaped or "lever-type" design. In 1855, Robert Yeates, a cutlery and surgical instrument maker of Trafalgar Place West, Hackney Road, Middlesex, UK, devised the first claw-ended can opener with a hand-operated tool that haggled its way around the top of metal cans.[11]
In 1858, another lever-type opener of a more complex shape was patented in the United States by Ezra Warner of Waterbury, Connecticut, US. It consisted of a sharp sickle, which was pushed into the can and sawed around its edge. A guard kept the sickle from penetrating too far into the can. The opener consisted of several parts which could be replaced if worn out, especially the sickle.[12] This opener was adopted by the United States Army during the American Civil War (1861–1865); however, its unprotected knife-like sickle was too dangerous for domestic use. A home-use opener named the "Bull's head opener" was designed in 1865 and was supplied with cans of pickled beef named "Bully beef". The opener was made of cast iron and had a very similar construction to the Yeates opener, but featured a more artistic shape and was the first move towards improving the look of the can opener. The bull-headed design was produced until the 1930s and was also offered with a fish-head shape.[2]
Rotating wheel can openers
The first rotating wheel can opener was patented in July 1870 by William Lyman of Meriden, Connecticut, US and produced by the firm Baumgarten in the 1890s.[13] The can was to be pierced in its centre with the sharp metal rod of the opener. Then, the length of the lever had to be adjusted to fit the can size, and the lever fixed with the wingnut. The top of the can was cut by pressing the cutting wheel into the can near the edge and rotating it along the can's rim.[14]
The necessity to pierce the can first was a nuisance, and this can opener design did not survive. In 1920, Edwin Anderson[15][16][17] patented a can opener with pivoted handles with which to hold the can in one hand while a key-type handle geared to a cutting wheel is turned with the other cutting the outside of the lip,[18][19][20] a side can opener, unlike the gramophone-like orientation of most contemporary can openers, in effect a hand-held pliers version of the Swanson Can-Opener.[21] In 1925,[22] the Star Can Opener Company[23] of San Francisco, California, US had improved Lyman's design by adding a second, serrated wheel, called a "feed wheel", which allowed a firm grip of the can edge.[24] This addition was so efficient that the design is still in use today.[25][26][27][28][29]
Whereas all previous openers required using one hand or other means to hold the can, can-holding openers simultaneously grip the can and open it. The first such opener was patented in 1931 by the Bunker Clancey Company of Kansas City, Missouri and was, therefore, called the "Bunker". It featured the now standard pliers-type handles, when squeezed would tightly grip the can rim, while turning the key would rotate the cutting wheel, progressively cutting the lid along the rim. The cutting wheel is coupled to a serrated feed wheel as in the Star design[30][16] and rotated in the opposite direction by interlocking cogwheels reducing friction. The Bunker company was absorbed by the Rival Manufacturing Company, also of Kansas City, in 1938.[2]
A new style of the can opener emerged in the 1980s. Whereas most other openers remove the lid by cutting down through the lid from the top just inside the rim, removing the top and leaving the rim attached to the can, these use a roller and cutting wheel to cut through the outside seam of the can. The can is left with a relatively safe, non-jagged edge, and the top can be set back on top as a cover, although it does not provide a seal.[31] The feed wheel teeth have a somewhat finer pitch than those of earlier designs and reside at the bottom of a V-shaped groove, which surrounds the rim on three sides at the point of action.[32][33]
A "butterfly" serrated-wheel and raking blade can opener with a can piercer, on left, and "church key" bottle cap lifter, on rightContemporary church key, three views. The left end is a can piercer and the right end is a bottle cap lifter.
Church key initially referred to a simple hand-operated device for prying the cap (called a "crown cork" or "bottle cap") off a glass bottle; this kind of closure was invented in 1892.[34][35] The first of these church key style openers was patented in Canada in 1900.[36]
The shape and design of some of these early "church key" opener's fulcrum hole resembled a large old key's dual-node keyring hole.[37] In 1935, steel beer cans with flat tops appeared, and a device to pierce the lids was needed. The same opener was used for piercing those cans. Made from a single piece of pressed metal, with a sharp point at one end, it was devised by D.F. Sampson,[38][39] for the American Can Company, who depicted operating instructions on the cans.[40] The church key opener is still being produced, sometimes as part of another opener.[41][42][43][44] For example, a "butterfly" opener is often a combination of the church key and a serrated-wheel opener. Beer and soda cans began in the mid-1960s to feature pop-tabs, which were rings attached to cans. These tabs eliminated the need for church keys to open the cans.[45]
Military use can openers
First Pocket and militar opener was the revolutionary pocket can opener, advertised as being for explorers, "Explorador español", manufactured in Spain in 1906, designed by D. José Valle Armesto, which would become the first pocket can opener, due to its lightness and versatility, as it allowed, in addition to opening cans, to do the same with bottle caps or act as a screwdriver. [46][47][48][49]
Several can openers with a simple and robust design have been specifically developed for military use. The P-38 and P-51 are small can openers with a cutter hinged to the main body. They were also known as a "John Wayne" because the actor was shown in a training film opening a can of K-rations. The P-38 can opener is keychain-sized, about 1.5inches (38mm) long, and consists of a short metal blade that serves as a handle (and can also be used as a screwdriver), with a small, hinged metal tooth that folds out to pierce the can lid. A notch just under the hinge point keeps the opener hooked around the rim of the can as the device is "walked" around the rim to cut the lid out. A larger version, called P-51, is somewhat easier to operate. P-38 was developed in 1942 and was issued in the canned field rations of the United States Armed Forces from World War II to the 1980s. The P-38 and P-51 are cheaper to manufacture and are smaller and lighter to carry than most other can openers. The device can be easily attached to a keyring or dog tag chain using the small punched hole.[50]
Official military designations for the P-38 include "US Army pocket can opener" and "Opener, can, hand, folding, type I". As with some other military terms (e.g., jeep), the origin of the term is not known with certainty. The P-38 and P-51 openers share a designation with the Lockheed P-38 Lightning and North American P-51 Mustang fighters, however this is coincidental. The most likely origin of the name is much more pedestrian; the P-38 and P-51 measure 38mm (1.5in) and 51mm (2.0in) in length respectively.[51]
P-38s are no longer used for individual rations by the United States Armed Forces, as canned C-rations were replaced by soft-pack MREs in the 1980s. They are, however, included with United States military "Tray Rations" (canned bulk meals). They are also still seen in disaster recovery efforts and have been handed out alongside canned food by rescue organizations, both in America and abroad in Afghanistan. The original US-contract P-38 can openers were manufactured by J. W. Speaker Corp. (stamped "US Speaker") and by Washburn Corp. (marked "US Androck"), they were later made by Mallin Hardware (now defunct) of Shelby, Ohio and were variously stamped "US Mallin Shelby O." or "U.S. Shelby Co."[52]
Standard issue "FRED" can opener of the Australian Defence Force
A similar device that incorporates a small spoon at one end and a bottle opener at the other is currently employed by the Australian Defence Force and New Zealand Army in its ration kits. The Field Ration Eating Device is known by the acronym "FRED". It is also known as the "Fucking Ridiculous Eating Device".[53][54]
Another similar device was included with British Army "Operational Ration Pack, General Purpose" 24-hour ration pack and "Composite Ration Pack" rations. At one time they were manufactured by W. P. Warren Engineering Co., Ltd. The instructions printed on the miniature, greaseproof paper bag in which they were packed read: "Their design is similar, but not identical, to the P-38 and P-51 can openers."[52]
Most military ration can openers have a very simple design and have also been produced for civilian use in many countries. For example, small folding openers similar to the P-38 and P-51 were designed in 1924 and were widely distributed in the Eastern European countries.[55]
In Slovenia a somewhat rounded version of a P-38 is known as "sardine can opener", because in the 1990s such openers were usually packed with cans that did not feature the pull-top pre-scored lid. A non-folding version of the P-38 used to be very common in Israeli kitchens, and can still be found in stores, often sold in packs of five.
The first electric can opener was patented in 1931 and modeled after the rotating wheel can opener design.[56] Those openers were produced in the 1930s and advertised as capable of removing lids from more than 20 cans per minute without risk of injury.[57] Nevertheless, they found little success. Electric openers were re-introduced in 1956 by two American companies. Klassen Enterprises of Centreville brought out a wall-mounted electric model,[58] but this complex design was unpopular too.[2] The same year, Walter Hess Bodle invented a freestanding device, combining an electric can opener and knife sharpener.[59] He and his family members built their prototype in his garage, with daughter Elizabeth sculpting the body design. It was manufactured under the "Udico" brand of the Union Die Casting Co. in Los Angeles, California, US and was offered in Flamingo Pink, Avocado Green, and Aqua Blue, popular colors of the era. These openers were introduced to the market for Christmas sales and found immediate success.[2]
A flameless ration heater (FRH), colloquially an MRE heater, is a form of self-heating food packaging included in U.S. military Meal, Ready-to-Eat (MRE) rations since 1993.
The C-ration was a United States military ration consisting of prepared, canned wet foods. They were intended to be served when fresh or packaged unprepared food was unavailable, and survival rations were insufficient. It was replaced by the similar Meal, Combat, Individual (MCI) in 1958; its modern successor is the Meal, Ready-to-Eat (MRE).
A drink can is a metal container with a polymer interior designed to hold a fixed portion of liquid such as carbonated soft drinks, alcoholic drinks, fruit juices, teas, herbal teas, energy drinks, etc. Drink cans exteriors are made of aluminum or tin-plated steel and the interiors coated with an epoxy resin or polymer. Worldwide production for all drink cans is approximately 370 billion cans per year.
A steel can, tin can, tin, or can is a container made of thin metal, for distribution or storage of goods. Some cans are opened by removing the top panel with a can opener or other tool; others have covers removable by hand without a tool. Cans can store a broad variety of contents: food, beverages, oil, chemicals, etc. In a broad sense, any metal container is sometimes called a "tin can", even if it is made, for example, of aluminium.
A lock is a mechanical or electronic fastening device that is released by a physical object, by supplying secret information, by a combination thereof, or it may only be able to be opened from one side, such as a door chain.
The P-38 is a small can opener that was issued with canned United States military rations from its introduction in 1942 to the end of canned ration issuance in the 1980s. Originally designed for and distributed in the K-ration, it was later included in the C-ration. The lightweight, tiny, P-38 foldable military can opener was designed and patented by J.W.SPEAKER Corp.. As of 2024, it is still in production and sold worldwide.
A mess kit is a collection of silverware and cookware designed for use by military personnel for food and military rations. They may also be used during camping and backpacking. There are many varieties of mess kits that militaries issue to their personnel that later become available to consumers.
United States military ration refers to the military rations provided to sustain United States Armed Forces service members, including field rations and garrison rations, and the military nutrition research conducted in relation to military food. U.S. military rations are often made for quick distribution, preparation, and eating in the field and tend to have long storage times in adverse conditions due to being thickly packaged or shelf-stable.
The K-ration was a United States military ration consisting of three separately boxed meal units: breakfast, dinner, and supper. It was originally intended as an individually packaged daily ration for issue to airborne troops, tank crews, motorcycle couriers, and other mobile forces for short durations.
A Mason jar, also known as a canning jar, preserves jar or fruit jar, is a glass jar used in home canning to preserve food. It was named after American tinsmith John Landis Mason, who patented it in 1858. The jar's mouth has a screw thread on its outer perimeter to accept a metal ring or "band". The band, when screwed down, presses a separate stamped steel disc-shaped lid against the jar's rim.
Imperial Japanese rations were the field rations issued by Imperial Japan in World War II, and which reflected the culture of the Japanese military. Rations had to be stout, durable, simple, sturdy and had to survive without refrigeration for long periods of time. Typically each ration was served in the field in canned food boxes, and cooked near the battlefield. The mess tin was known as a han-gou.
A field ration is a type of prepackaged military ration designed to be easily and quickly prepared and consumed in the field, in combat, at the front line, or where eating facilities are otherwise unavailable. Field rations are primarily used by military forces, though they are also sometimes distributed to civilians as part of humanitarian aid and emergency management. They differ from garrison rations and field kitchen provisions, which are intended for where proper meals can be supplied and prepared with relative ease and safety, such as in the rear where logistics are steady and fresh food can be supplied. They are similar to, but distinct from, other purpose-designed long-lasting types of food or rations such as emergency rations, humanitarian daily rations, and camping food.
William Worcester Lyman was an American inventor from Meriden, Connecticut. He is credited with inventing the first rotating wheel can opener.
The 5-in-1 ration was a United States military ration issued from 1942 to the end of World War II. As its name implies, the 5-in-1 provided the needs of five soldiers in a single ration package. Procurement ended with the war, though remaining stocks were issued to troops after the war, as well as distributed as surplus in civilian feeding programs overseas. The 5-in-1 specification remained in effect after the war, and was again used in 1948 for a new field ration.
The Jungle Ration was a dry, lightweight United States military ration developed by the U.S. Army during World War II for soldiers on extended missions in tropical regions.
The field ration eating device (FRED) is an Australian eating utensil and multi-tool that serves as a combination of a can opener, bottle opener, and spoon. It is issued to the Australian Defence Force for use with its Combat Ration One Man field rations, and was first issued around 1943.
Bully beef is a variety of meat made from finely minced corned beef in a small amount of gelatin. The name "bully beef" likely comes from the French bouilli in Napoleonic times, or possibly from the head of a bull depicted on the popular Hereford brand of canned corned beef. The cans have a distinctive oblong shape. Bully beef and hardtack biscuits were the main field rations of the British Army from the Boer War to the Second World War. It is commonly served sliced in a corned beef sandwich. Potato-based dishes, such as "hash and hotch-potch", in which the potatoes and beef are stewed together, and "corned beef hash", where pre-boiled potatoes and corned beef are mixed with Worcestershire sauce then fried, are also made. Tinned corned beef is also used in France. Some places where British troops were present in the 20th century such as Malta, have adopted bully beef as part of their national cuisine. In February 2009, the British Defence Equipment and Support announced that they would be phasing out bully beef from ration packs as part of the introduction of the new Multi-Climate Ration Packs until this change was reversed due to backlash.
Military rations, operational rations, or military provisions are goods issued to sustain the needs of military personnel. As their name suggests, military rations have historically been, and often still are, subject to rationing, with each individual receiving specific amounts from available supplies. Military-issued goods and the rationing of such goods have existed since the beginnings of organized warfare.
The Meal, Combat, Individual (MCI) was a United States military ration of canned and preserved food, issued from 1958 to 1980. It replaced the earlier C-ration, to which it was so similar to that it was often nicknamed the "C-ration", despite the term never being used officially. The MCI was eventually replaced by the Meal, Ready-to-Eat (MRE).
The United States provided many inventions in the time from the Colonial Period to the Gilded Age, which were achieved by inventors who were either native-born or naturalized citizens of the United States. Copyright protection secures a person's right to his or her first-to-invent claim of the original invention in question, highlighted in Article I, Section 8, Clause 8 of the United States Constitution, which gives the following enumerated power to the United States Congress:
To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries.
↑ R. Foster (18 August 1995). "The greatest Army invention ever". Pentagram (Army Public Affairs) (image of article at www.dogtagsrus.com). Archived from the original on 23 October 2009. Retrieved 8 August 2009.
↑ Greame Hardiman. "The Malayan Emergency. 2RAR 1956/57". 2RAR. Digger History: an unofficial history of the Australian & New Zealand Armed Forces. Retrieved 5 November 2007. I remember the spoon come tin opener that was in later years nicknamed "Fred" (Fucking ridiculous eating device)
↑ "Black Berets". Ration Pack. Australian Defence News & Opinion – MilitaryPeople.com.au. 2007. Archived from the original on 11 May 2010. Retrieved 8 August 2009.
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