Can opener open a can without a can opener
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For the grappling hold, see spinal lock#Can opener. open a can without a can opener
A modern opener with a combination of a rotating cutting wheel and a serrated wheel open a can without a can opener
A can opener (also known as a tin opener) is a device used to open metal cans. Although preservation of food using tin cans had been practiced since at least 1772 in the Netherlands, the first can openers were patented only in 1855 in England and in 1858 in the United States. Those openers were basically variations of a knife, and the 1855 design continues to be produced. The first opener employing the now familiar sharp rotating wheel, which runs around the can's rim cutting the lid, was invented in 1870 but was difficult to operate. A breakthrough came 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. open a can without a can opener
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 simple design where a folding knife and absence of a handle significantly reduced the opener size. Electric can openers were introduced in the late 1950s and met with success. The development of new can opener types continues with the recent addition of a side-cutting model. open a can without a can opener
Contents open a can without a can opener
[hide] open a can without a can opener
• 1 Invention of cans open a can without a can opener
• 2 First, lever-type can openers open a can without a can opener
• 3 Rotating wheel openers open a can without a can opener
• 4 Churchkey open a can without a can opener
• 5 Military use can openers open a can without a can opener
• 6 Electric openers
• 7 Modern designs
• 8 See also
• 9 References
• 10 External links
Invention of cans
Food preserved in tin cans was in use by the Dutch Navy from at least 1772. 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 had later set up the world’s first canning factory in London in 1813. By 1820, canned food was a recognized article in Britain and France and by 1822 in the United States. 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."
First, lever-type can openers
open a can without a can opener
Lever-type can opener design of 1855 by Robert Yeates open a can without a can opener
Lever-type can opener design of 1858 by Ezra Warner open a can without a can opener
Bull-head lever-type can opener of 1865
Dedicated can openers appeared in the 1850s and were of 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 open a can without a can opener with a hand-operated tool that haggled its way around the top of metal cans.
In 1858, another lever-type opener of a more complex shape was patented in the US by Ezra Warner ofWaterbury, Connecticut. 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. This opener was adopted by the US 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.
Rotating wheel openers open a can without a can opener
The Bunker opener open a can without a can opener
Rotary can opener of 1870 by William Lyman open a can without a can opener open a can without a can opener
Double-wheel design of 1925
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. The can was to be pierced in its center 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.
The necessity to pierce the can first was a nuisance, and this can opener design has not survived till present days. In 1925, the Star Can Opener Company of San Francisco, California had improved the Lyman's design by adding a second, toothed wheel called "feed wheel", which allowed a firm grip of the can edge. This addition was so efficient that the design is still in use today.
Whereas all previous openers required using one hand, or other means, to hold the can, can-holding openers both hold 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 handle, grasping which would tightly hold the can, while turning the key would rotate the cutting wheel progressively cutting the lid along the rim. The Bunker company was absorbed by the Rival Manufacturing Company, also of Kansas City, in 1938. open a can without a can opener
Main article: Churchkey
A key used to open cans by rolling their part on it open a can without a can opener
A modern butterfly opener which combines a serrated wheel and a churchkey
Churchkey initially referred to a simple hand-operated device for prying the cap (called a "crown cork") off a glass bottle; this kind of closure was invented in 1892. The first of these churchkey style openers was patented in Canada in 1900. The shape and design of some of these openers did resemble a large simple key. In 1935, beer cans with flat tops were marketed, and a device to puncture the lids was needed. The same churchkey opener was used for piercing those cans. It was made from a single piece of pressed metal, with a pointed end used for piercing cans — devised by D.F. Sampson, for theAmerican Can Company, who depicted operating instructions on the cans themselves, The churchkey opener is still being produced, usually as an attachment to another opener. For example, a "butterfly" opener is often a combination of the churchkey and a serrated-wheel opener.
There is sparse, and often contradictory, documentation as to the origin of the term "churchkey". The phrase is likely a sarcastic euphemism, as the opener was obviously not designed to access churches. One explanation is in Medieval Europe, most brewers were monks. Lagering cellars in the monasteries were locked, and the monks carried keys to these lagering cellars. It may have been those keys, which remotely resembled the early churchkey openers, gave the "churchkey" opener its name. Another motive for assigning the device such an ironic name could have been the fact beer was first canned (for test marketing) in 1933 — the same year Franklin Delano Roosevelt signed the Cullen-Harrison Bill. This act, which predated Repeal of Prohibition, amended the Volstead Act, making 3.2 beer legal. Some experts have posited the term "churchkey" was a way to "stick it to" the religious organizations who had effected Prohibition in the first place.
Another key opener with completely different design was patented by J. Osterhoudt in 1866. Instead of piercing the can it was used to roll a stripe off the can. It was also called "key", because of resemblance to a door key. Such openers are attached to many small, thin-walled cans nowadays. open a can without a can opener