Riippulukko

Riippulukko is a portable locking device used to secure items by attaching to a hasp, chain, or staple. It consists of a lock body and a shackle that can be opened with a key or, in some models, a combination. The body is usually made of steel, brass, or laminated metal, while the shackle is typically hardened steel to resist cutting or sawing. The most common locking mechanisms are pin-tumbler and disc-detainer, though lever and high-security variants also exist. Some padlocks are designed to be keyed alike, while others use unique keys or support master-key systems.

Types of riippulukko differ by mechanism and by shackle design. Pin-tumbler padlocks are common, offering a balance of security and affordability. Disc-detainer padlocks use rotating discs for locking and are often more resistant to picking. Lever padlocks can provide higher security but tend to be larger and heavier. Shackle designs vary from round to rectangular, with longer shackles providing access to thicker hasps but potentially reducing rigidity. High-security padlocks may include hardened shackles, anti-drill plates, and more sophisticated key control.

Applications for riippulukko are broad and include securing gates, tool sheds, lockers, mailboxes, and storage containers. They can be used with chains or hasps and can be part of a master-key or keyed-alike system in a facility. Maintenance involves keeping the lock dry, occasional lubrication with graphite, and timely replacement if the mechanism becomes jammed or corroded. Padlocks have a long history and continue to be widely used for portable, flexible security.