Why Are There Two Pieces To A Door Latch?

The main latch is supposed to fall into the strike hole on the door frame, the little part is supposed to sit on the surface of the strike (not fall into the hole). This feature is meant to keep someone from retracting the latch from the outside of the door with a credit card or other device.

What are the different parts of a door latch?

Parts of a Door Lock

• Knobs and Handles. The common door lock will have two knobs or handles—one on the inside of the door and one on the outside.
• Rosette. The rose or rosette is typically a round plate that serves two functions.
• Lock Cylinder.
• Spindle.
• Latch Assembly and Spring Bolt.
• Deadlocking Plunger.
• Strike Plate.

What is a door latch spindle?

A spindle is a length of square rod or bar, made from metal, usually steel, which connects two Door Handles or Door Knobs together on either side of a door. The spindle locates into the square holes found at the back of a set of door handles or door knobs.

What is the throw on a latch?

Latch Throw – Recent editions of NFPA 80 no longer state the required latch throw – the distance that the latch must project from the door edge.

What is the difference between a spring latch and a dead latch?

Deadbolts are thicker and heavier than spring latches, and they are not rounded or angled at the end. They are normally comprised of steel, bronze or brass, and they extend deeper into the door frame–typically about one inch–than spring latches.

Why is the door latch sticking?

According to Elmer’s Lock & Safe, door latches stick for three main reasons: broken internal mechanisms, being jammed and misaligned strike plates. It may be broken inside if the latch sticks when you try to move the handle, but you can still press on it and make it slide back and forth.

Why are some door spindles split?

The split spindle is designed to replace the solid spindle of a door handle allowing the external handle to operate the lock mechanism with a cylinder key only. The inside the handle can be operated as normal for a quick and easy exit.

How does a split spindle door lock work?

The split spindle allows door locks with in built split spindle mechanisms to operate. The spindle allows the external handle of the door to operate the lock mechanism, however it prevents the latch operating unless you use the door cylinder key.

What do grub screws do?

A set screw, also known as a blind screw or a grub screw, is a type of screw generally used as a detent to secure an object within or against another object, usually without using a nut (see bolts compared with screws). The most common examples are securing a pulley or gear to a shaft.

What is latch VLSI?

A latch is a digital logic circuit that can sample a 1-bit digital value and hold it depending upon the state of an enable signal. Based upon the state of enable, latches are categorized into positive level-sensitive and negative level-sensitive latches.

What is the second lock on a door called?

bow
Locks are shaped to distinguish between various keys so that it only unlocks for the right key. The second part of the key is called the bow. This is the part that protrudes from the locking mechanism when the key is in place. This allows the user to provide torque to unlock and open.

Is a latch a lock?

A latch fastens a door, gate or window in position but does not provide security.A lock prevents anyone without a key from opening a door/gate/etc.

How does a dead latch work?

The purpose of the deadlatch is to prevent the latch from being pushed back with a knife or credit card when the door is closed.The latch itself goes into the hole on the strike plate, but the deadlatch rests on the edge of the hole and is depressed against the strike plate when the door is closed.

What is a deadbolt on a door?

Deadbolts feature a unique locking mechanism that resists physical attacks, battering and boring. They cannot be opened with a knife or hand tool. Deadbolt locks come in three types: single, double and C. Single cylinder deadbolts are the simplest ones and can be activated from one side via a key.

How do I know if I have a deadlock?

The first sign you will have of a deadlock is the following error message which will be displayed to the user who own the process that was selected as the deadlock victim.The other user whose process was not selected as the victim will be most likely be completely unaware that their process participated in a deadlock.

Why does door latch not retract all the way?

Check to see that the plate on the door frame is actually making contact with the angled part of the latch. It’s possible that due to thermal expansion or contraction of the door or frame, the plate is now striking the latch on the non-angled part causing it not to retract.

How do you lubricate a door latch?

The quickest way to do this is to spray WD-40 directly into the keyhole, around the latch, along the tube of a deadbolt and around the handle, and then turning the mechanism repeatedly, spreading the lubricant around inside. You only need to do this once a month or so to keep them all in near-new condition.

What does double spindle mean?

A Dual spindle has 2 spindles at different heights. This means that the levers / moving parts of the door handle will be at different levels on the inside and outside.The levers / moving parts of the door handle will be at the same level.

What does split spindle mean?

Split spindle relates the actual spindle inside the handles having a split in the middle. Dual spindle refers to there being two separate spindles, usually used in lever pad door handles which are offset (different heights).

How do you fix a split spindle?

Use a simple procedure to replace a broken spindle.

1. Open the door part way.
2. Locate the small setscrews or hex bolts at the inner portion of each door knob.
3. Pull out both sections of the broken spindle from the door lock.
4. Fit one end of the new spindle fully into the square port at the inner end of a door knob.

What are spindles?

Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.