Riegelschlösser

Riegelschlösser are a class of mechanical door locks that use a sliding bolt (Riegel) to secure a door by engaging with a strike plate in the door frame. The bolt moves in and out of the lock case, typically controlled by a key or a lever linked to a cam or other mechanism. They are commonly used on interior and exterior doors and can be found in various building types.

Construction and variants: A Riegelschloss consists of a lock body, a sliding bolt, and the actuation mechanism. The bolt is usually a solid steel bar that travels in a guide within the door edge. Designs can be mortise-mounted (embedded in the door) or rim-mounted (surface installed). Some locks employ a single bolt, while others use two or more bolts for increased resistance to forced entry. Additional features may include interior release devices, hardened strike plates, and anti-picking components.

Operation: Locking typically occurs by extending the bolt into the strike plate when the key is turned or the lever is operated. The bolt is retracted to open the door. Interior release mechanisms, such as a thumbturn or lever, allow opening from inside without a key in many models. The precise motion depends on the specific lock design and whether it is spring-loaded or requires deliberate action to retract the bolt.

Security considerations: The security of a Riegelschloss depends on bolt length and material, the strength of the strike plate mounting, and the protection of the lock cylinder against picking and drilling. Higher-security variants use longer bolts, multiple bolts, and reinforced housings. Proper installation and alignment are essential for reliable function.

Applications and context: Riegelschlösser are a traditional and robust locking solution used in residential and commercial doors. They are often complemented by additional locking systems, such as multipoint mechanisms, for enhanced security. See also cylinder locks and multipoint lock systems.