| A door knob is a popular type used for opening and closing a door. In the simplest form, a door knob provides a place to grab so that the door may be pulled towards oneself. |
|
| It normally holds the closed door and is attached to the modern doors. |
|
| A door knob may also have an inbuilt lock. Though in some cases it is beneficial to have a separate lock. |
|
| |
| Crash bar/panic bar: |
|
| A spring-loaded bar that is mounted horizontally on the side of a door, opens outward. When pushed upon the bar, the bolt is released. |
|
| This device is compulsory where the fire exits. |
|
| Many of these doors are one-way, and cannot be opened from the outside. To use this device on a two-way door, another type of handle must be mounted on the opposite side. |
|
| |
| DOOR FASTENERS - |
|
| Latch : |
|
| A door fastening device has no locking function. |
|
| |
| Lock : |
|
| A device that prevents access by those without a key or combination. |
|
| |
| Rim lock: |
|
| A lock which is built up to the outer surface of a door. |
|
| |
| Bolt: |
|
| |
| A metal pipe, usually internal to the door that extends to the jamb(vertical side of a doorway) fastens a door. |
|
| They are typically manipulated with a lock on the outside and a lock on the inside. Bolts are generally used for security purposes. |
|
| Latchbolt: |
|
| A bolt whose surface acts as a base to push the bolt inside while the door is being closed. |
|
| By the use of a latch bolt, a door can be closed without operating the handle. |
|
| |
| Deadbolt - |
|
| |
| Deadbolts usually extend deeper into the frame and are not automatically retractable the way while the latch bolts are. |
|
| They are typically manipulated with a lock on the outside and either a lock or a latch on the inside. |
|
| Deadbolts are generally used for security purposes on external doors. |
|
| Push Plates: |
|
| |
| Push plates are properly located to receive the normal hand push. |
|
| These are centered 45" from the bottom of the frame. |
|
| Crossbar: |
|
| A fastener consisting simply of a plank or beam mounted to one side of a door by a set of hooks. |
|
| The board can be slid past the frame to block the door. Alternatively, the bar can be a separate piece that is placed into open cleats or hooks, extending across the frame on both sides. |
|
| This device is essentially opposite of the crash bar that it effectively makes the door one-way while in us. |
|
| |
| Hinge: |
|
| |
| A joint that holds two parts together so that one can swing relative to the other. |
|
| A component that attaches one edge of a door to the frame while allowing the other edge to swing from it. |
|
| One door usually has about three hinges but it can vary. |
|
| These are made of stainless steel, aluminum, brass and iron. |
|
| Hinges come in a large variety of sizes and weights. |
|
There are various hinges such as
Butt hinges, slip hinges, joint hinges, flag hinges, T-hinges, spring hinges, bi-fold screen hinges, latch hinges, concealed hinges, strap hinges and even hinges have anti-microbial coating to control bacteria, mold and mildew |
|
| DOOR VIEWER - |
|
| Optical device fitted into a hole in front of a door enables observation without opening the door. |
|
| Viewer has a curved lens in it to magnify an image on the other side of the door. Viewers have various degrees of vision. |
|
| DOOR CLOSER - | | | | | These are devices for closing doors or gates automatically after opening. | | They may be overhead or floor mounted and either exposed or concealed.
There are two general styles of door closers: | | | Manual and automatic: | | | A manual door closer will close a door after it has been opened by hand. | | | An automatic door closer opens the door itself, typically under the control of a push button, motion detector or other device and then closes it as well by detecting whether it is safe to close the door. | | | DOOR BELLS - | | | A push button at outer door that gives a ringing or buzzing signal when pushed. | | | | | DOOR STOPPERS - | | | It is a thin slat built inside the frame to prevent a door from swinging through when closed. Hinges might break without their use. | | | | | ARCHITRAVE - | | | It is a decorative molding that outlines a door frame. | | | | |