Locking cylinder and locking apparatus

A locking cylinder comprising a cylinder housing, a cylindrical core rotatably disposed in a core bore inside the cylinder housing, said cylindrical core contains a key channel, core pins provided in the cylindrical core and housing pins moveably guided in housing pin bores, the housing pins being resiliently biased by springs in a direction of the core pins, and at least one core-adjacent, tumbler element disposed displaceably, within a cavity which crosses a rotational interface of the cylindrical core, by a wide-side profile of a key insertable into the key channel, a first spring spring-loading the tumbler element in the outward direction of the core, said tumbler element having a control projection projecting sidewards into the key channel, said cavity comprises a core hollow and a locking channel, said locking channel is positioned across or opposite the housing pin bores for rotation-blocking reception of the tumbler element, a housing-adjacent tumbler pin spring-biased in a core-inward direction projectable into the core hollow when the tumbler element is withdrawn across the rotational interface, and a second spring spring-biasing the housing-adjacent tumbler pin in said core-inward direction, and wherein the spring power of the first spring which loads the tumbler element is greater than that of the second spring which biases the housing-adjacent tumbler pin.