Vehicle door
A vehicle door is a partition and one of the categories of
car parts, typically
hinged, but also frequently attached by other mechanisms such as tracks,
in front of an opening which is used for entering and exiting a vehicle.
A vehicle door can be opened to provide access to the opening, or closed
to secure it. These doors are similar to a doors used in buildings.
These doors can be opened manually, or powered electronically says
automatically. Powered doors are usually found on minivans, high-end
cars, or modified cars.
Types
There are many different types of car door. These are the types.
OEM or regular
An OEM (Original Equipment Manufacturer) doors (also known as a
conventional door or regular door) are type of door that are hinged at
the front-facing edge of the door and so allows the door to swing
outward from the body of the car.
Suicide doors
Suicide doors are a type of door that is hinged on its trailing
edge.
Scissor doors
Scissor doors are doors that rotate vertically upward and are hinged at
a near the end of the windshield.
Butterfly doors
Butterfly door is a type of door that are similar to scissor doors,
but while scissor doors move up, butterfly doors also move outwards,
which makes for easier entry/exit and saves space.
Gull-wing doors
Gull-wing doors are a type of door that are hinged at the roof rather
than the side. They are so named because, when opened, the doors evoke
the image of a seagull's wings.
Sliding doors
Sliding doors are a type of door that open by sliding horizontally,
whereby the door is either mounted on or suspended from a track. They
are often used on the side of commercial vans, as this allows a large
opening for equipment to be loaded and unloaded without obstructing
access.
Door locks
Most vehicle doors may be locked to prevent unauthorized access from the
exterior. There are a variety of car door locking systems. Door locks
may be manually or automatically operated, and may be centrally or
individually operated. Also, they may be operated by remote control,
with the transmitter often integrated into the main vehicle access /
ignition key.
Additionally, rear passenger doors are frequently fitted with child
safety locks to prevent children from exiting the vehicle unless the
door is opened from the exterior.
Windows
Most vehicle doors have windows, and most of these may be opened to
various extents. Most car door windows retract into the body of the
doors, and are opened with a manual crank or electrical switch. In the
past, certain retracting windows were operated by direct (up or down)
pressure and were held in the up position by friction instead of by an
internal lift mechanism.
Other cars (particularly older US-manufactured vans) have hinged windows
with a folded lever mechanism to push and hold the window out from its
closed position.
One other no-longer common configuration is a triangular window in to
fill out the forward, non-rectangular portion of the upper half of the
front door. These windows pivot on a vertical access and the portion
that is pushed outside, given the angle of incidence with the car's
direction of forward motion, pushes external air into the vehicle. Such
windows, as found on the Nissan Sunny, are operated with and locked shut
with a pivoting latch, often with a push button lock.
Door brakes
Vehicle doors often include brakes that slow the door down just before
it closes. The current standard is to have a three-stage door brake.
Door brakes exist because the doors on the first vehicles were heavy, so
they have to be pushed hard to make them close. Soon after,
manufacturers managed to manufacture lighter doors, but users are used
to closing doors with force so doors quickly became damaged. Door brakes
were then introduced to slow down the door just before the door closed
to prevent damage; these soon became standard.
