| 摘要 |
A micro-switch box (14) is used in conjunction with a lock to provide an indication of when a door (11; 122), for example, is locked. The micro-switch box usually has a top wall (101; 202; 302), a bottom wall (102; 203; 303), a back wall (103; 201; 322) and two side walls (104; 204 and 207; 321 and 323). The front of the micro-switch box may be open or it may be partially closed by a front wall (324) with an aperture (318) in it, or by a pair of sub-walls (205 and 206). Normally, a cover plate (213; 315) or a striker plate (110), with an aperture (111; 214; 318) in it, which is attached to the front of the micro-switch box, is used to mount the micro-switch box on a door frame (10). A support plate (107; 220; 339) within the micro-switch box enables a micro-switch (108; 125; 211; 340) to be mounted within the micro-switch box, behind the aperture or gap in the front of the micro-switch box and/or the aperture in the cover plate or striker plate, so that the end (13; 119) of a bolt of a lock may pass through the aperture(s) and/or gap, and bear against, then depress, the actuation member (118; 126; 212; 341) of the micro-switch. Actuation of the micro-switch generates a signal which indicates that the end of a bolt of a lock is positioned within the micro-switch box. A balanced reed switch (120) may be included within the micro-switch box, adjacent to its front, behind the cover plate or striker plate, to provide a "door closed" signal. The micro-switch box may be used in a range of monitoring and/or alarm systems, including (if the micro-switch box has been appropriately manufactured) an alarm system for a type 1 secure room. |
