| 摘要 |
The two-step locking system includes a dual locking unit comprised of a flat plate to which a recessed cover is hinged. The plate has a keeper projecting therefrom and said recessed cover has a slot through which the free end of the keeper extends so that a padlock can be attached to the keeper via a hole therein to prevent the cover from being opened. A sleeve is secured to said plate, the sleeve projecting a lesser distance from the plate than the keeper, so that the sleeve is completely concealed when the cover is closed. A penta-head bolt extends through the plate of the unit into threaded engagement with a tapped hole in a bracket. The plate of the dual locking unit is riveted to one component of a two-component enclosure, and the bracket is riveted to the other component. The tapped hole in the bracket is in registry with the bolt when the two components are mated so as to allow the bolt to be threadedly engaged with the bracket. The bolt can only be removed when the recessed cover is open, and the cover cannot be opened until the padlock has been first removed.
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