What are circle keys called?

en.wikipedia.org - Tubular pin tumbler lock - Wikipedia

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tubular lock and key and key

A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape. Most locks use between six and eight pins, although some use as few as four or as many as ten. The devices have been widely used on vending machines, elevators, public computers, and bicycle locks.

Design [ edit ]

The design of a tubular lock is similar to the pin tumbler lock, in that there are several stacks of pins. The key is a cylinder shape with notches cut around the outer or (rarely) inner edge. Each of these notches depresses a single pin inside the lock to a specific height allowing the lock cylinder to turn freely. Mechanism The key pins (red) and driver pins (blue) are pushed towards the front of the lock, preventing the plug (yellow) from rotating. The tubular key has several half-cylinder indentations which align with the pins. The protrusion on top of the key fits into the rectangular recess in the lock, causing the indentations to properly align with the pins. When the key is inserted, the gaps between the key pins (red) and driver pins (blue) align with the shear plane separating the plug (yellow) from the outer casing (green). With the pins correctly aligned, the lock may turn.

Uses [ edit ]

Tubular locks are commonly seen on bicycle locks (such as the Kryptonite lock), Kensington computer locks, elevators, and a variety of coin-operated devices such as vending machines, and coin-operated washing machines. Tubular pin tumbler locks are often considered to be safer and more resistant to picking than standard locks. This is primarily because they are often seen on coin boxes for vending machines and coin-operated machines, such as those used in a laundromat. However, the primary reason this type of lock is used in these applications is that it can be made physically shorter than other locks.[1]

Vulnerabilities [ edit ]

Such locks can be picked by a special tubular lock pick with a minimum of effort in very little time; it is also possible to defeat them by drilling with a hole-saw drill bit. Standard tubular-lock drill bit diameters are 0.375 in (9.5 mm) and 0.394 in (10.0 mm).[2] To prevent drilling, many tubular locks have a middle pin made from hardened steel or contain a ball bearing in the middle pin. Some tubular locks, such as those used on older models of Kryptonite-brand bike locks, can be opened with the back end of a ball-point pen.[3][4]

What is a key signature in piano?

a Key Signature tells you in your piano music what Key you are in, so you know the exact notes to play for the piece to sound correct. a Key Signature will be notated in the upper left corner of each line of your music; in both the right & left hands.

instructables.com - How to Read Key Signatures in Piano Music : 4 Steps - Instructables

Key Signatures in Piano Music are a map of sorts that tell us how to navigate through a piece using the correct roads and turns to get to our destination. If we take a wrong turn or play a sharp when we're supposed to play a natural, we won't accomplish our goal and get to where we want to be. The Key of a piece is the first thing that we need to learn before we start learning it so we'll learn the correct notes. The Key of a piece tells us what the Key Signature is, and just like your own signature, every Key is unique and has its own unique set of notes in it. Let's start by finding out what a Key is and how it helps us to learn a piece better.