| 摘要 |
<p>Abstract. A micro-switch box that enables an open door, having the square bolt of its lock extended, to be closed, has the open front of the box structure (101, 102, 104, 124, and 107) in which a micro-switch is mounted closed by a front plate (200). A tongue member (202) extends from one side edge (212) of the front plate. The box structure and its front plate can slide in a channel formed by a channel plate (220) and the cover plate component (151) of a cover member (150). The cover member has a face plate component (110) for mounting the micro-switch box in a door frame. An aperture (152) in the cover member permits the end of the lock bolt and the tongue member (202) to move freely rearwardly. Biasing springs (206, 218) hold the front plate (200) adjacent to the face plate component (110) under normal use conditions. When an open door with an extended lock bolt is closed, the end of the lock bolt contacts an arcuate surface (213) of the tongue member (202), thus applying a force to the tongue member which moves the tongue member, and all the components attached to it, rearwardly. The biasing springs (206, 218) return the front plate (200) to its normal use position, adjacent to the face plate component (110), when the end of the lock bolt has passed over the front face of the displaced front plate (200) and has become aligned with the aperture (201) in the front plate. Dead latching of the lock bolt is among the additional features that may be included with the micro switch box.</p> |
