| 摘要 |
PURPOSE:To prevent a tumbler from being damaged when a key is inserted in the shallow depth of a key hole and rotated. CONSTITUTION:A plurality of tumblers 6 engaged in the engaging grooves 12 of an outer cylinder 1 and a pair of cylinder pins 8 are radially slidably supported, by the inner cylinder 2 rotatably supported in the inside of the outer cylinder 1. When a key K is correctly inserted in the depth of a key hole 21, the tumblers 6 are separated from the engaging grooves 12 of tumbler by the marked groves K1 of the key K and a pair of cylinder pins 8 are separated from the engaging grooves 12 of tumbler by the tip end K2 of the key K to allow the inner cylinder 2 to rotate. When the key K is rotated without correctly inserted into the depth of the key hole 21, the inner cylinder 2 is restricted in its rotation and the tumbler 6 is prevented from being damaged owing to the engagement of the highly rigid cylinder pin 8 with the engaging grooves 12 of tumbler. |
