Types of Door Latches
Latches are crafted in various materials and thicknesses, finishes and sizes to meet specific engineering requirements. For instance, engineers may select a galvanized latch to avoid corrosion and ensure the durability even in harsh environments.
Other specifications include the level of security required for the application. A hook lock latch, for example, is more secure than hasps, and might require the use of a padlock.
Hook and Eye Latch
The hook and eye latches is a simple way to lock gates, windows cabinets, sheds, and gates. It's also great for securing screens, porches and storm panels. There are no fancy tools required and the hook can be screwed in manually in a matter of minutes. The screw points are sharp and can be sunk into wood quickly and easily for added stability and security.
To determine the proper hook size, first identify the hook type. Crosby Group (c): Look near the clevis or eye for the type of hook embossed and size. The size in inches is on one side and the size in mm is on the other. The clevis grabber hook has the ability to connect directly to chain, while the eye rigging features a large, angled eye for use with synthetics or wire rope. Pewag(c): The hook type, size in mm and the alloy grade is embossed on the lower part of the hook bowl. CMCO Columbus McKinnon (c) Check out the "HA 800" or "HA 800-1000" as well as the hook size on the lower part of the bowl, near the clevis.
Laclede(c) market the Cartec chainhook. It's easy to spot as it has a raised "Cartec" embossed on the bowl's bottom and is safety orange or red. Gunnebo (c) and CMCO Columbus McKinnon have their names embossed on the lower part of the hook bowl. Additionally, Gunnebo has a swivel hook that's identified by an "ELD" mark mid-way into the bowl of the hook. The hook has a large eye that can distribute round and web slings.
Clevis Latch
A clevis latch permits users to secure the hook using clevis to an anchor point and it also helps prevent the hook from coming loose during the transfer of a load. Clevis latches are available in different styles, like ones with spring-loaded handles or those with safety locks. The latter is ideal for use with slip hooks since they ensure that the load doesn't fall off the hook unless an upward force is applied. This feature makes slip hooks for clevis compatible with ASME B30.9 Slings standards and OSHA regulations.
A standard clevis lock has an clevis pin that has an end with a tang, and a head that is formed at the other. The clevises are constructed from steel, which provides strength to the latch. They are often coated with zinc, silver, or chromium, to resist corrosion. They can be made harder.
These latches are used in a variety of applications that range from connecting chains and rigging equipment to secure cargo in pickup trucks and on trailers. These latches can also be employed in heavy-duty tasks such as the securement of cranes and machinery.
Certain clevises have been made with folded pieces while others are made from machined pieces. Their bases feature holes that are threaded or unthreaded and they can be fastened to other components with an clevis bolt, or a clevis hanger.
The clevis pin can be threaded and fit into an open or slotted hole. The pin has a larger diameter than a bolt, and is designed to withstand massive shearing stresses and support an axial load.
Many clevis latches are hardened to withstand the strain and vibration of use in harsh environments. Some are designed for overhead lifting. This means that they can support more weight than non-hardened models. A hardened latch may also be plated in a variety metals such as silver or nickel to improve the resistance to corrosion. Paint or powder coatings can be used to improve their appearance and provide the color.
Self-Closing Latch
The locking mechanisms can be as complicated or simple as the overall design. These devices are usually constructed from metal to ensure durability and strength. They can also be powder coated or painted to enhance the appearance of the latch. Latches, regardless of the materials they are made of are required to resist bending, shearing and impact forces. The thickness of the barrels, backing plates and cams are key factors in determining whether they are light-, medium-, or heavy-duty.
The kind of latch you select should be based on your security needs and the kind of door or enclosure that it will be connected to. For example, a lightweight garden gate can be secured with a hook latch, while an imposing shed door requires a padlock and hasp combination.
It doesn't matter whether you use an automatic latch or not. The most important thing is to ensure that it is closed properly. This reduces the risk of accidental disengagement that could lead work-site injuries. If you are not sure whether the hook is ready to be loaded, look for a lock that has an internal stop mechanism or trigger.
Another important consideration is handedness. Certain bolt, rotary and slam designs have been designed specifically to be left-handed or right-handed. Left-handed latches are typically placed in the middle of the latch on doors that face towards the interior. The right-handed designs are positioned on the outside of the door and are employed on doors that are facing outwards from the inside of the building.
There are also specialized tools that work around the Adams Rite style commercial door locking latches found on many trucks and buses. They enter through a cutout on the side of the commercial door next to the latch. They reach up within the assembly to pull an adjustable bar that will retract the latch back into the open position. These tools are available online or in many hardware stores that stock Adams Rite latches.
Keyed Latch
Latches are used to keep doors and gates closed. There are various types of latches. Each type has a distinct purpose. Common latches for doors include hook cam, clevis and hook latches as well as compression latches and rotary ones. Some latches come with locking mechanisms like the panic bar or a keyed lock. Metals are the most popular material for latches but other materials may also be employed. They are also subjected to additional processes in order to improve their quality of surface. The finishes available for latches include powder coating, painting, and polishing.
Keyed latches are latch with a cylinder that requires a key to unlock it. The pins and tumblers in the cylinders align with the key's cut to unlock the latch. Some locks include extra features such as antidrill or antipick protection.
van hook deadlocks of latch is the hasp consisting of a steel strap and staple. The staple is attached by hinges to the other end of the strap that has slots in it. Other materials like plastic and rubber can be used to create latches, however, metals are preferred due to their shapeability, machinability, and strength.
Door latches are typically crafted from metals, but there are some exceptions. Certain latches, like made of plastic, are designed to help reduce weight or to meet other design specifications. Other kinds of latches can be utilized for specific applications such as latches designed to be activated by pushing the lever or handle, which allows emergency exits in buildings and other settings.
There are two types of door latches, including levers and knobs. Knobs are generally used on older doors, while levers are more popular in the latest designs. Some latches can be opened on both sides. This is ideal for doors that are with no windows. A the pawl latch is a straightforward version of a cam latch that can be locked with the quarter-turn and unlocked using a reverse quarter-turn. It is typically used on electronic enclosures and in buses, trailers RVs and trucks.