| 摘要 |
<p>An extended latch tube housing comprises a standard deep-drawn tubular shell having a front mounting flange and rear end wall, and a a coaxial second deep drawn shell of equal diameter with its end wall fixed to the end wall of the standard shell. The standard hell of the extended housing contains a conventional latch bolt and deadlocking mechanism, and this is actuated by tailpiece means which extends to the rear of the extended housing for connection with the retractor of a cylinder lock chassis. The rear of the extended housing carries ears for connection with such chassis, preferably as part of a back plate which also locates and guides the tailpiece means. With a short housing extension, the tailpiece means may be a lengthened standard tailpiece. With a longer extension, the standard front shell assembly includes a standard tailpiece, and a second standard tailpiece member is attached thereto by a rotatably engaged connector. The back plate guides the second tailpiece member in a fixed orientation so as to maintain the connector in engagement.</p> |
