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snaplock : ウィキペディア英語版
snaplock

A snaplock is a type of lock for firing a gun or is a gun fired by such a lock.
A snaplock ignites the (usually muzzleloading) weapon's propellant by means of sparks produced when a spring-powered cock strikes a flint down on to a piece of hardened steel. The snaplock is therefore similar to the snaphaunce (sometimes classed as an advanced type of snaplock) and the later flintlock (see below).
In all snaplocks, the flint is held in a clamp at the end of a bent lever called the cock. When the gun is "cocked", the cock is held back, against the pressure of a spring, by a catch which is part of the trigger mechanism. When the trigger is pulled, the catch is released and the spring moves the cock rapidly forwards. The flint strikes a curved plate of hardened steel, called the "steel". The flint strikes from the steel a shower of white hot steel shavings (sparks) which fall towards the priming powder held in the flash pan. The flash from the pan's ignited primer travels (unless there is only a "flash in the pan") through the touch hole into the firing chamber at the rear of the barrel, and ignites the main charge of gunpowder.
Before the weapon is fired, the pan has a closed cover: the mechanism for opening this cover (i.e. manual or automatic) can affect whether the weapon is classed as a snaplock. In fact, the term ''snaplock'' may be used in three ways, as follows:
* The most general use of ''snaplock'' is for any lock which strikes flint against steel but which does not have the defining feature of a true flintlock. This is the frizzen, a single piece of metal which is a combined "steel" and self-opening pan cover.
* A more restrictive definition excludes the snaphaunce, more sophisticated weapons with a lateral sear and a pan cover, separate from the steel, that opens automatically.
* Sometimes the term is used only for specific Scandinavian, German, and Russian varieties of lock.
==Period of Use==
The snaplock first appeared in the late 1540s, probably in southern Germany.〔Blair 1983:42〕 It was cheap and easy to produce, and like all post-matchlock weapons, could be primed and loaded in advance and be fired at a moment's notice. It was used until modern times in Scandinavia and Russia, but by about 1640 it was out of fashion almost everywhere else. 〔Blair 1983:67〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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