| 摘要 |
<p>A shallow penetration, key operated lock. The lock includes an outer casing and a cylinder is mounted for rotation in the casing and is adapted to be connected through a lever assembly to a working member. The cylinder is provided with a central keyway and a locking member, such as a side bar, acts to removably lock the cylinder to the casing to prevent rotation of the cylinder. At least one pair of tumbler plates are mounted in flatwise sliding relation within the cylinder and each tumbler plate is provided with an opening which is aligned with the keyway. In addition, the tumbler plates of each pair are provided with aligned elongated openings and a spring is positioned longitudinally within the openings and bears against the respective ends of the openings. A double bitted, non-reversible key is received within the keyway and the key bits slide the tumbler plates relative to each other to move the tumbler plates into an operative position. In the operative position, the side bar is released to thereby enable the cylinder to be rotated relative to the outer casing. The springs, which also bear against shoulders formed in the cylinder, act to return the tumbler plates to a neutral key-receiving position when the key is removed from the lock.</p> |
