| 摘要 |
The door guard exerts pressure against a door knob and a closed door thereby preventing the door from being opened or the door knob from being rotated. Tremendous pressure can be exerted against a door by the door guard because its upper member and lower member may pivot about each other which permits the placing of the upper end of the top member on the door knob and the lower end of the bottom member on the floor at a point closer to the door than would be possible if the guard had just one member or did not have pivotable members.
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