| 摘要 |
This is a security device to be attached to an inside security grill. It would protect the unauthorized entry of individuals and provide emergency departure from a secured area. It is a sequentially operated keyless lock primarily for use as an escape device but has application on automobiles, medicine cabinets, closets and childproof areas as it makes access difficult. It is sequential in that opening the lock requires the use of both hands and three physical movements. Step One must be done and remain stationary before Step Two can be accomplished. While Step One still remains stationary and after Step Two is completed, only then can Step Three be completed, opening the lock. If the sequence is interrupted before completion, the lock cannot be opened.
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