Tubular pin tumbler lock

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.
Enlarge
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).
Enlarge
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).
Missing image
Tubular_unlocked.png
With the pins correctly aligned, the lock may turn.

A tubular pin tumbler lock is a variety of pin tumbler lock in which the pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape. Locks of this type are commonly seen on bicycle locks and vending machines.

Design

To be written. The author of the illustrations at right requests comments.

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