| 摘要 |
<p>The lock case (125) contains a motor and gear train driving a wheel having on one face two diametrically opposed pegs. Each peg as it revolves enters and leaves a notch (134) in a drive lever (132) on a common pivot (137) with and pinned (144) to the lock catch (131). While engaged, the peg rotates the lever (F3), compressing a return spring (143). In the closed position (motor deenergised), the lock bolt (130), on a separate pivot (139), retaining the hasp bar in its notch (138), is secured by the catch (131a,136), which with the lever is pushed towards it by the spring. The bolt's curved face (135) rests on the lever shank (132c), while the lever's sprung (140) toe (140a) rides on its concave face (142). The peg's opening action draws the catch clear (d) of the bolt. The lever's resilient toe (140a) mean-time has ridden up the bolt face (142) and hooked over the vertex (141); however, in normal circumstances, reaction forces exerted by the compressed door seal, via the hasp bar, on the bolt notch (138) rotate the bolt, allowing the bar to escape, so releasing the door. If these forces should be insufficient, the second drive-wheel peg, arriving on the outer face (132a) of the lever, press through the toe on the bolt, keeping it in the closed position until, e.g. the user adds his efforts; meantime the motor remains stalled.</p> |
