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A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]
A trapdoor is a door set into a floor or ceiling. Trapdoor or Trap Door may also refer to: Trap Door, a science fiction fanzine; The Trap Door, a British animated TV series The Trap Door, a computer game based on the animated series; Trapdoor (software), a piece of computer software used for network administration
The usual design is a trap-door, to minimize the size and expense. In dual-purpose shelters, which have a secondary peacetime use, the door may be normal. To reduce the weight, the door is normally constructed of steel, with a fitted steel lintel and frame welded to the steel-reinforcement of the concrete.
The doors and windows that opened to nothing resulted from the 1906 earthquake and the severe damage that happened to the house. [18] [14] [4] The small steps were built because of Winchester's declining health. [10] The trap doors were constructed in a greenhouse room where excess water could run and be piped to an outdoor garden. [14]
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An intercom and/or video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door. For example, a key may open the first door, but a personal identification number entered on a number pad opens the ...