| 摘要 |
The invention relates to a lock for use with a pair of overlapping doors or windows which are slidably mounted in a pair of adjacent upper tracks, wherein one of the tracks includes a vertical side rail. The lock includes a faceplate and at least one bolt member secured to the faceplate and adapted to slidably pass through the frame of one of the closure members into engagement with the frame of the other. An eccentric-type lock device mounted on the faceplate is adapted to engage one of the closure members for the purpose of securing the faceplate thereto. The upper edge of the faceplate is adapted to abut the side rail of the upper track when it is locked to the inside closure member and thereby limit the vertical movement of the two closures in the upper tracks and/or secure the two doors rigidly together to prevent lateral shifting relative to each other.
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