Rekeyable lock cylinder

A lock cylinder, comprising:

• a cylinder body;
• a plug body rotatably disposed in the cylinder body, the plug body having a keyway;
• a plurality of guide channels, each guide channel of the plurality of guide channels having a sidewall opening defining a pair of retention supports;
• a plurality of cup-shaped pins movably coupled to the plug body, each cup-shaped pin of the plurality of cup-shaped pins being located in a respective guide channel of the plurality of guide channels, wherein each pair of retention supports cooperates with its respective guide channel to restrain movement of a respective cup-shaped pin in the respective guide channel in a direction transverse to the keyway, and each cup-shaped pin of the plurality of cup-shaped pins has an engagement protrusion that extends into the sidewall opening of the respective guide channel;
• and
• a plurality of racks movably coupled to the plug body, each rack of the plurality of racks having at least one engagement groove to selectively receive the engagement protrusion of the respective cup-shaped pin.

A lock cylinder, comprising:

• a cylinder body;
• a plug body rotatably disposed in the cylinder body, the plug body having a keyway;
• a plurality of guide channels, each guide channel of the plurality of guide channels having a slotted sidewall opening;
• a plurality of cup-shaped pins movably disposed within the plurality of guide channels, each guide channel of the plurality of guide channels being configured to conform to the shape of a respective cup-shaped pin of the plurality of cup-shaped pins to restrain movement of the respective cup-shaped pin in the respective guide channel in a direction transverse to the keyway, and each cup-shaped pin of the plurality of cup-shaped pins having an engagement protrusion that extends into the slotted sidewall opening of the respective guide channel;
• and
• a plurality of racks movably coupled to the plug body, each rack of the plurality of racks having at least one engagement groove to selectively receive the engagement protrusion of the respective cup-shaped pin.