| 摘要 |
A security entrance door is provided to receive delivery through inner and outer doors safely without opening an entrance door and to prevent trespass through inner and outer doors of a delivery door by keeping the inner and outer doors locked. A security entrance door(1) is attached with a delivery door(2) including a support frame(3) coupled to an installation hole formed on an entrance door, inner and outer doors(5,6) fixed to the support frame by two fixing pins, a doorsill(7) placed between the inner and outer doors and fixed to the inside of the support frame, a support plate(9) connected to a joint of the fixing pin of the inner door by a hinge(8) to be foldable, a pair of plates(11,11') connected to the bottom of the support plate and the inner door by a hinge(10) to be foldable, a holding projection(9a) formed on the lower part of the support plate, a slide hole(12) formed on the outer door to couple the holding projection, and a locking device installed to lock or unlock the inner and outer doors and operated by a knob installed to the indoor side, wherein a hinge connection(13) connecting two adjacent plates while inner and outer doors are opened is located higher than a hinge connection(14) connecting the bottom of a support plate, an inner door and plates, so that the two plates are formed in the ∧ shape from the side with the inner and outer doors opened. |
