Pin lock
The lock with pins , still called lock of Yale , uses a series of pins (pins) of various sizes, to block the opening without the introduction of the key corresponding. One largely uses this system in the commonly widespread Serrure S with cylinder nowadays.
History
The principle of the pin lock goes up with the ancient Egypt, with a system of using locking of doors of the wood pins which one raised with a suitable height to release the opening. Nevertheless, it is necessary to await 1860 so that American Linus Yale Jr. (1821 - 1868) improves the invention of his/her father - also called Linus Yale Sr. - and deposits a patent for the first cylindrical lock equipped with a notched wrench, similar to those which one uses today.
Operation
In a lock of Yale, the cylinder turns inside a barrel . The cylinder comprises a slit (the way of key ) intended to accommodate the key. At his other end, one finds a cam or a lever allowing to actuate the bolt of the lock.The cylinder is bored holes perpendicular to the way of key (generally 5 or 6), inside of which slide of the pistons, which are positioned according to the height of the notches of the key. These holes correspond to other openings bored in the barrel, which contain pins pressed in direction of the cylinder by helicoid Ressort S. The pin-drifts have each one a size different defining the combination from the lock. When one introduces the key into the lock, the latter pushes back the pin-drifts which in their turn press on the pins.
If a notch of the key is too short, the corresponding pin is not pushed back sufficiently high and it remains embedded in the hole of the cylinder. A contrario , if a notch of the key is too long, the piston comes to be embedded in the hole of the barrel, preventing the cylinder from turning. It is necessary that all the notches of the key align the pins in extreme cases of the barrel and the cylinder so that this last can turn. The end of the pin-drifts is round so that the key is inserted easily.
See too
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