Multi-combination security lock and key

摘要

A plunger-type (barrel) lock has a spring loaded plunger which can only be properly retracted by the use of a key having a central rod, enlarged end sliding member and outwardly moving fingers for gripping engagement within a socket (cylinder bore) of the plunger. A movable, spring-biased eyelet is positioned adjacent the socket, such that an unauthorized key or tampering tool will grip the eyelet, rather than the plunger socket, failing to open the lock. The key has a toggle type operating lever including a tension relief element in the form of a spring, coacting with an internal collar of the key to allow some axial movement of the key's operating elements. Use of the collar allowing axial movement of the key's operating elements and complementing socket diameter of the plunger within the lock can provide security lock combinations for the user(s).