| 摘要 |
A top-and-bottom latch lock includes symmetrical L-shaped control rods provided with pressing portions for connecting to springs. The ends of the control rods are disposed with braking pieces provided with bumps, so as to have symmetrical gulfs of a flat member accommodate the bumps of the braking pieces. Above and below the flat member are provided with a turning axis having an opening and an oscillating shaft, respectively, such that the control rods are extended outward or contracted inward through turning of a rotation body, key or handles of the lock, thereby locking or opening a door.
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