| 摘要 |
The first variation of an apparatus which consists of a plate, which can work with a bolt hole of a door jamb, and a movable part, which can engage with the plate, to create a rigid structure; the second variation of the apparatus which consists of a "U"-shaped object, which can work with the doorknob of an existing door, and a channel-liked object, which can engage with the "U"-shaped object to create a rigid structure; the third variation of the apparatus which consists of a first object, which can work with the doorknobs of the existing double swing doors, and another object, which can work with the doorknobs of the existing double swing doors and which can engage with the first object to form a rigid structure.
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