A door communication device for use with a door. The door communication device includes a rotatable message wheel for selectively displaying a selected one of a plurality of messages and a rotatable shaft that provides an optical viewing pathway through the door. The shaft is formed from an intumescent material that expands to block the bore of the shaft when sufficiently heated, such as by a fire, to inhibit the passage of heated air and smoke through the door.

The present invention relates to a parking barrier having an advertising function, and the present invention relates to a parking barrier in which vertical panels printed with an advertisement are arranged and provided so as to be supported by a cross bar, thereby having an advertising function. The parking barrier having an advertising function according to the present invention comprises; a driving unit; an upper cross bar provided so as to be rotatable by the driving unit, thereby controlling vehicles; and a plurality of vertical panels provided at the upper cross bar such that upper ends thereof are rotatable, thereby maintaining a vertical state by the weight thereof, wherein a rotating shaft and the revolving shaft so as to be engaged with each other such that the vertical panels revolve on the revolving shaft when the upper cross bar rotates so as to stand upright.

The present application disclosed a flip screen with replaceable materials and adjustable screen tilt angle. Which comprising a U-shaped base, a crank handle, a polygonal rotating shaft, a left-fixed round plate, a right-fixed round plate, a damping plate, a side plug-in plate, and a damping arm. Pictures or images made from various materials can be securely clamped into the installation groove, allowing them to be supported by the side plug-in plate. This design extends the service life of the flip screen and does not impose strict requirements on the materials used for the images, enhancing its practicality.

The present application disclosed a flip screen with replaceable materials and adjustable screen tilt angle. Which comprising a U-shaped base, a crank handle, a polygonal rotating shaft, a left-fixed round plate, a right-fixed round plate, a damping plate, a side plug-in plate, and a damping arm. Pictures or images made from various materials can be securely clamped into the installation groove, allowing them to be supported by the side plug-in plate. This design extends the service life of the flip screen and does not impose strict requirements on the materials used for the images, enhancing its practicality.