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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 ]
Gullwing doors with a second hinge between door and moving roof panel are called falcon wing doors. Scissors – rotate vertically at a fixed hinge at the front of the door, and open by rotating on a horizontal axis, perpendicular to the vehicle's length. Scissor doors that also move outward while rotating are called dihedral synchro-helix ...
Left hand hinge (LHH): Standing outside (or on the less secure side, or on the public side of the door), the hinges are on the left and the door opens in (away from you). Right hand hinge (RHH): Standing outside (or on the less secure side), the hinges are on the right and the door opens in (away from you).
Pixar's location in Emeryville, California, had a hidden room hidden by a sliding bookcase. [20] It was initially discovered by Pixar animator Andrew Gordon, who opened a hatch door in his office that revealed a hidden room that was designed to provide maintenance workers "access to a portion of the building's ventilation system". [ 20 ]
General Motors developed a clam shell style "disappearing" design where the rear window rolls up into the roof and the tailgate slides down and beneath the load floor. [17] If the door is hinged at the top it is termed a hatch, and a car with a rear hatch a hatchback. [12] [18] A bottom-opening door is now common on SUVs.
The second type is the self-disposing Type IIIB hatch, found on more modern aircraft (such as the Boeing 737 Next Generation) which has been designed to both simplify the opening of the exit and to reduce the hazard of the removed hatch blocking the exit. This is accomplished by the passengers simply pulling in and down on a handle recessed ...