| 摘要 |
<p>PURPOSE: To prevent malfunction at opening a lock or forced open by providing a second peripheral notch outside the cutting range of a combination peripheral notch of a locking disc, whose pitch corresponding to the mutual pitch between the combination peripheral notches. CONSTITUTION: An auxiliary bar 11 is continuously located partly inside a lock cylinder 2 within a second slot 13 while partially entering a slot 21 of a lock body 1. A radial movement of the auxiliary bar 11 inside the lock cylinder 2 is guided by a slot 18 in a locking disc 6. The slot 18 prevents the auxiliary bar 11 from contacting a second peripheral notch 10 of the locking disc before the locking disc 6 is turned near the opening position of a lock mechanism so that a recess 18a in the slot 18 is located at a position of the auxiliary bar 11. A guide surface 21a of the slot 21 radially pressurizes the auxiliary bar 11 inward so that mutual rotation of a locking disc 4 is prevented.</p> |
