Door latch is an integral part of door hardware. Typically, door latches do not lock; however, some latches are available with a key-locking mechanism or can be secured with a padlock. Latches with a locking option can only be opened from the outside with a key. In order to complete the door ensemble, door latch consist of strike plates, tube latches and rim lock plates. However, there are latches that can also be opened without a key.
Mostly metals are used for making door latches. Some of the common materials used in the process include:
Door Latch Mechanism
The working principle of a door latch is relatively simple, compact and easy to install. A typical door latch mechanism has a pivoted latch, which is disposed between a retaining solenoid and a four-bar toggle linkage.
- The toggle linkage is meant for connecting the operating system of the solenoid to the latch.
- The toggle linkage is also provided with an under-the-center arrangement in a direction opposite to the solenoid in the latched position.
- This offers considerable mechanical advantage to strengthen the holding force of the solenoid.
- When the solenoid is de-energized and pressure is applied to open the door, the latch pivots and the toggle linkage collapses to release the keeper bar.
Door latches should be chosen in such a way that they fit exactly with the strike plates.
- The quality of the metal chosen for making latches is also important as the security of the house depends on latches.
- The finish of the door latch should go with the overall impression of the door and the house.
- The overall finishing of the door latches hardware should be very smooth so that it does not hurt any individual while operating it.
Some door latches have an inside release that is a component on the inner side of the latch that allows it to be actuated. Again door latches have mounting holes or slots for securing them to doors, drawers, or cabinets.
- There are recessed latches that are designed to be mounted in an indentation in the housing.
- Latches that contain gaskets prevent the entry of environmental contaminants when used under pressure.
- Weather resistant door latches are also available.
Depending on the door on which they are used door latches can be of the following types: Cam Latch
- Compression Latch
- Dead Latch
- Draw Latch
- Mortice Latches
- Patio Door Latches
- Rim Latches
- Rotary Latch
- Sliding Door Latches
- Spring Latch
Selecting Door Latches
A door latch is a fastening, as for a door or gate, typically consisting of a bar that fits into a notch or slot and is lifted from either side by a lever or string. It is typically a door fastening consisting of a pivoted bar, which crosses the joint of the door to engage with the strike on the jamb, the free end of the bar being raised to disengage it from the strike on the jamb, by a transverse pivoted bar passing through the door. Typically, latches do not lock however there are some latches available with a key-locking mechanism or can be secured with a padlock.
Door latches, made of different materials, are available in many sizes. They are made of cast iron, brass and aluminum.
If you want to buy latches for sliding doors then patio door latches are the best options. Due to their finishes and functionality they are most sought after door latches in the world for big hotels and resorts.
To bring rustic and retro feel in the home Rim latches are the perfect choice. Like most modern latches, rim latches are mounted on the inside of a door instead of in the door edge.
Dead latches provide extra protection to your windows whereas for simple operations adjustable handles or simple pull handles are the best. Some of the latches like L-handles door latches are normally spring-loaded that return to their original position after use.
Styles or types should be selected after the types of window is selected. Metallic latches usually brass and chrome go well with all types of windows. However if you are selecting metallic latches their resistivity to corrosion should be checked properly.