| 摘要 |
<p>A Z-bar security system, one which is provided with a key (132) and a secured latch (52), is combined with an electronic alarm and monitoring system (203). This combination provides the maximum degree of both mechanical and electronic security. In a preferred embodiment, a Z-bar latch assembly (10) has a three-position rotatable cylinder (16) which is operable by a key (132) from outside of the door (24). These three positions correspond, respectively, to 'open', 'viewing' and 'closed' positions of the door (24).</p> |
