| 摘要 |
<p>A safety door lock has a positioning plate (1) fastened to a door jamb and fastened with a stop plate assembly (2) that stops the door at a closed position relative to the door jamb. The positioning plate has back mounting lugs (11) secured to mounting holes on the door jamb and a longitudinal slide way (12) with serrations (121) on one side. The stop plate assembly has a bottom plate inserted to the slide way, a vertical rear extension for stopping the door panel in the closed position, a shell (25) with a bottom pivot pin and a through hole covered in the bottom plate, a movable engagement plate with a rear pivot hole coupled to the pivot pin and a tooth engageable to any serration, a spring to bias the tooth into engagement, a button (24) installed inside the shell and protruded out via the through hole, a bottom rod provided at the shell and inserted into the cam hole of the engagement plate, and another spring connected between the side wall and the shell. The button is pressed with the user's finger to release engagement between the tooth and the serration.</p> |
