Instruct: Given a question, retrieve relevant passages that can help answer the question.
Query: Who invented the safety pin?
American mechanic Walter Hunt is regarded as the inventor of the safety pin that bears resemblance to those used today. The safety pin included a clasp that covered the point and kept it from opening, and a circular twist at the bend to act as a spring and hold it in place.[3] Charles Rowley (Birmingham, England) independently patented a similar safety pin in October 1849,[4] although the company no longer makes these.
The Colt 1911 lacked a firing pin safety and was noted for an unfortunate tendency to fire, if loaded, if dropped on its muzzle. This is in spite of there being an external thumb safety and a grip safety. Neither blocked the movement of the firing pin. A sufficiently strong shock caused the firing pin to move forward with enough force to fire the cartridge. Sig Sauer 1911 pistols (all that are currently made) have that firing pin block which is not released until the trigger is actually pulled.
Pallet Rack Safety Bolt - Also Known As: Pallet Rack Drop Pin, Pallet Rack J Bolt, Pallet Rack Safety Pin, Universal Pallet Rack Drop Pin, Pallet Rack Pins, J Bolt Pins, Rack Safety Pins, Pallet Rack Beam Locking Device, Cross Beam Pin, Safety Clio, Shelf Clip...
Various fuzes (detonation mechanisms) are used, depending on purpose:Beyond the basic "pin-and-lever" mechanism, contemporary grenades have safety features. The main ones are the safety clip and the bent end of the safety pin. The safety clip was introduced in the M61 grenade (1960s, Vietnam War), and is also known as the "jungle clip" – this provides a backup for the safety pin, in case it is dislodged, notably by jungle flora (plants and vegetation). This is particularly important because the safety lever is often used as a carry hook, despite the obvious danger this poses. The bent end of the safety pin increases the force required to remove it, reducing the risk of accidental arming. The 2016 US ET-MP uses a user-settable timed electronic fuze.
A safety notch is one of the oldest forms of drop safety, used on older single-action revolvers manufactured before the invention of the hammer block, some lever-action rifles, 1911-pattern guns, and hammer-fired semi-automatics that were designed before the invention of the firing pin block. The safety notch is a relief cut made in the tumbler at the base of the hammer, that allows the sear to catch and hold the hammer a short distance from the pin or cartridge primer, in a "half-cocked" position. The safety notch works first by allowing the handler to retract the hammer a short distance from the firing pin or primer, such that dropping the firearm on its hammer will not result in an energy transfer to the pin or spur, which could then discharge a chambered cartridge. A second purpose is to allow the sear to "catch" a hammer that is falling when the trigger has not been pulled, such as in cases where a drop jarred the sear loose or when the hammer was not fully cocked before being released. However, a safety notch used to "half-cock" a firearm is an active feature that must be engaged, and does not positively prevent accidental discharges in all cases. A certain amount of manual dexterity and familiarity with a firearm is also required to "half-cock" a firearm; unfamiliarity with how to engage the "half-cock" position can result in accidental discharges. Moreover, safety notch and "half-cock" style safeties are prone to breakage which can result in unintentional discharges leading to severe personal injuries or death.
The M9 features multiple internal safeties, including a firing pin block that prevents the firing pin from moving without the trigger being pulled, and a firing pin striker that rotates when the safety lever is engaged preventing the firing pin from being hit even if the hammer falls. The M9 also has an ambidextrous external safety lever allowing both left and right handed users to engage or disengage the safety mechanism.
The classic hand grenade design has a safety handle or lever (known in the US forces as a "spoon") and a removable safety pin that prevents the handle from being released: the safety lever is spring-loaded, and once the safety pin is removed, the lever will release and ignite the detonator, then fall off. Thus, to use a grenade, the lever is grasped (to prevent release), then the pin is removed, and then the grenade is thrown, which releases the lever and ignites the detonator, triggering an explosion. Some grenade types also have a safety clip to prevent the handle from coming off in transit.
The sharpened pin, that is attached to a coiled wire is connected with a cap that is hooked at the end of the wire. Pushing the pin into the opening of the cap secures the safety of the pin, and the clasp is the closed.[9]
The sport of bowling takes several forms in Canada, including ten-pin and lawn bowling, but most notably Canada has its own version: Five-pin bowling, which was invented circa 1909 by Thomas F. Ryan in Toronto, Ontario, at his "Toronto Bowling Club", in response to customers who complained that the ten-pin game was too strenuous. He cut five tenpins down to about 75% of their size, and used hand-sized hard rubber balls, thus inventing the original version of five-pin bowling. Five-pin is played in all parts of Canada, but not played in any other country. Candlepin bowling is played at several centres in Nova Scotia and New Brunswick.
Walter Hunt invented the safety pin by forming an eight-inch brass pin into a bent pin with a spring and guard. He sold the rights to his invention to pay a debt to a friend, not knowing that he could have made millions of dollars.
Each gas cylinder has a pin configuration to fit its respective gas yoke. Refer to the diagram for pin numbers; dimensions are in millimeters.
The pin index system is a safety system (PISS) designed to ensure the correct gas is filled into the correct cylinder, and that the cylinder will only connect to the correct equipment. The positions of the holes on the cylinder valve correspond with the pins fitted to the yoke attached to the equipment. The pin positions for each medical gas are unique. If an attempt is made to fit the wrong gas cylinder to the yoke a tight seal will not be made, as the pins cannot locate.
Gold or silver style safety pins were commonly used as tie and collar pins from the beginning of the 20th century. Such a safety pin was used to fasten the tie to the shirt and was an integral part of a man's clothing or school uniform, being especially useful on formal occasions or in windy weather. It could now be possibly making a comeback in 2013 as recently illustrated in the fashion section of a British newspaper. 
Alternative ways to control unruly ties are available, although an ordinary safety pin inserted through from behind the shirt can invisibly secure the tie without damaging its surface.
While the cover on the safety pin makes it less likely to hurt someone, a version was invented especially for use with babies' diapers, the diaper pin. This is larger and stronger than the typical safety pin. Modern diaper pins have either a sliding cap to lock the pin or a S shaped channel inside the cap.
Whilst the cover on the safety pin makes it less likely to hurt someone, a version was invented specially for use with babies' nappies, the nappy pin. This is larger and stronger than the typical safety pin. Modern nappy pins have the sliding cap to lock the pin.
Like the M1911, the Ruger 1911 is single action only. It also has features such as a beavertail grip safety and a manually operated thumb safety. In addition to these two safeties, the Ruger SR1911 also has a sear disconnect, slide stop and half-cock position. Although Colt's 80 series developed a trigger operated firing pin block safety, and Kimber and Smith & Wesson use a Swartz firing-pin safety, which is operated by the grip safety; the Ruger SR1911 pistol features a titanium firing pin and heavy firing pin spring, which negates the need for a firing pin block, offering an updated safety feature without compromising trigger pull weight.
Glock pistols are designed with three independent safety mechanisms to prevent accidental discharge. The system, designated "Safe Action" by Glock, consists of an external integrated trigger safety and two automatic internal safeties: a firing pin safety, and a drop safety. The external safety is a small inner lever contained in the trigger. Pressing the lever activates the trigger bar and sheet metal connector. The firing pin safety is a solid hardened steel pin that, in the secured state, blocks the firing pin channel (disabling the firing pin in its longitudinal axis). It is pushed upward to release the firing pin for firing only when the trigger is actuated and the safety is pushed up through the backward movement of the trigger bar. The drop safety guides the trigger bar in a ramp that is released only when direct rearward pressure is applied to the trigger. The three safety mechanisms are automatically disengaged one after the other when the trigger is squeezed, and are automatically reactivated when the trigger is released. This passive safety system omits the manipulation of traditional on-off levers, hammers, or other external safeties as found in many other handgun designs. The ability to fire immediately, without worrying about an external safety, is one feature Glock has stressed as an advantage when selling its guns, especially to police departments.
In 1848, Linus Yale, Sr. invented the modern pin-tumbler lock. In 1861, Linus Yale, Jr. was inspired by the original 1840s pin-tumbler lock designed by his father, thus inventing and patenting a smaller flat key with serrated edges as well as pins of varying lengths within the lock itself, the same design of the pin-tumbler lock in use today.
The typical firing pin is a small rod with a hardened, rounded end that strikes the primer. The rounded end ensures the primer is indented rather than pierced, as would happen if the firing pin were sharply pointed. Most firing pins have a spring to push them out of contact with the primer and often will have an integrated passive safety mechanism, such as a block that prevents them from moving forward unless the trigger is depressed, or a "transfer bar", also trigger actuated, that must be in place to allow the hammer to depress the firing pin. This safety is in addition to any manually operated safety or safeties that act to block the trigger or hammer.
The Ultrastars firing pin/safety system is substantially that of the M28/30/31. The safety lever is arranged opposite that of other modern Star pistols (protruding to the rear of the axis) and is designed to fit flush when on fire, instead of sticking out like most others. The firing pin stop plate is set up as usual; depress the firing pin to slide the plate up and off. The drop safety will, of course, have to be depressed to allow enough travel in the firing pin.
Safety pins are commonly used to fasten pieces of fabric or clothing together. Safety pins, or more usually a special version with an extra safe cover, called a nappy pin, or loincloth pin, are widely used to fasten cloth diapers (nappies), or modern loincloths, as the safety clasp, while remaining ingestion hazard,[1] prevents the baby or boy from being jabbed. Similarly, they can be used to patch torn or damaged clothing. Safety pins can also be used as an accessory in jewelry, like earrings, chains, and wristbands. Sometimes they are used to attach an embroidered patch. Size 3 is often used in quilting and may be labelled for purchase as a "quilting pin". Size 4 and larger may be called "blanket pins" and deemed acceptable as kilt pins for informal dress, depending upon design and appearance.
In 1946, a Westport housewife named Marion Donovan, invented the "Boater", a waterproof covering for cloth diapers. Marion was granted 4 patents for her designs, including the use of plastic snaps that replaced the traditional and dangerous "safety pins".
Modern stage pin connectors have incorporated a third pin for a safety ground connection and are commonly referred to as "two pin and ground" ("2P&G") to distinguish them from their ungrounded two-pin predecessors. The ground pin is situated between the line and neutral pins and closer to the latter. This asymmetrical configuration effectively polarizes the connector ensuring that the line and neutral conductors are not exchanged in a properly wired installation. The ground pin is also longer than the other two, ensuring that the safety ground connection is made first when making a connection.
The fibula, a form of brooch, was invented by the Myceaneans on the Greek Peloponnesus between the 14th and 13th Century BC, and is considered an early precursor to a safety pin since they were used in a similar manner. Fibulae were used by Greek women and men to help secure tunics.[2]
During the emergence of punk rock in the late seventies, safety pins became associated with the genre, its followers and fashion.[11] Some claim the look was taken originally from Richard Hell whom the British punks saw in pictures, and whose style they adopted.[12] This is disputed by a number of artists from the first wave of British punks, most notably Johnny Rotten, who insists that safety pins were originally incorporated for more practical reasons, for example, to remedy "the arse of your pants falling out".[13] British punk fans, after seeing the clothing worn by such punk forerunners, then incorporated safety pins into their own wardrobe as clothing decoration or as piercings, shifting the purpose of the pins from practicality to fashion. The safety pin subsequently has become an image associated with punk rock by media and popular culture outlets.[14]
Most laws dealing with the protection of inventions do not actually define what an invention is. A number of countries, however, define inventions as new solutions to technical problems. The problem may be old or new, but the solution, in order to be considered an invention, must be a new one. Merely discovering something that already exists in nature will not generally qualify as an invention; an adequate amount of human ingenuity, creativity and inventiveness must be involved. But an invention need not be technically complex: the safety pin was an invention that solved a “technical” problem.