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An ornate brass door hinge A barrel hinge. A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom.
It is called a French window when used in a pair as double-leaved doors with large glass panels in each door leaf, and in which the doors may swing out (typically) as well as in. A double-acting door, patented in 1880 by the Dutch-American engineer Lorenz Bommer, swings both ways. They are often used in areas where many people are likely to ...
The knuckles of the two plates are offset from each other and mesh together. A hinge pin is then placed through the two sets of knuckles and usually fixed, to combine the plates and make the hinge a single unit. [2] One door usually has about three hinges, but it can vary.
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 ...
A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. To use a revolving door, a person enters the enclosure between two of the doors and then moves continuously to the desired exit while keeping pace with the doors.
A crossbar for double doors employs the same principle, but, in most cases, must be manually set in place and removed due to its width being greater than both doors. A crossbar for a single jamb may be "captured" on the door by U-shaped bails, or anchored by a bolt on its inboard end and pivoted up and down into open cleats, making it a form of ...
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