| 摘要 |
<p>The locking mechanism is fitted in the proximity of the trap door frame (12) with a catch bolt (15), cooperating with an angle piece (14) fitted to the inner surface of the frame section by a screw (13). The catch bolt has a curved end surface (16). In its inner cavity (17) swivels a two-arm lever (18). A spring (24) urges one end in a recess (25) of the catch bolt, while the other end rests against the catch bolt in the locked position. The catch bolt slides inside a housing (34) operated by one arm (19) of the lever, resting against the surface (26) of the catch bolt cavity. The other arm (20) lever is operated by collar (33) fitted on a pull-rod (29) through the trap door leaf (10).</p> |
