- 12th September 2016 03:57pm
- 0 Comments
When I receive a call from a customer my first question is usually “What type of lock do you have?” To which the reply is usually either“One with a key" or “No idea”
So, I have decided to write this blog to make it easier for my customers (and anyone else who reads this) to identify what lock they have.
This lock is most commonly used on wooden doors as the lock itself is fitted into a hole in the side of the door (called a “mortice”) The lock is operated by a key on both sides, often referred to as a “CHUBB TYPE KEY”. On locking, a deadbolt extends from the lock case and then fits into a hole in the door frame. A mortice lock comes in two main forms; a DEADLOCK and a SASHLOCK.
Mortice Deadlock - As seen below, a mortice deadlock just contains the deadbolt locking function. As such, a second lock (commonly a Night Latch) is installed in conjunction with it.
Mortice Sashlock - A mortice sashlock contains a deadbolt function as well as a second bolt, named a “latch bolt”. The latch bolt keeps the door shut and is operated by a set of handles.
Often referred to as a “YALE TYPE LOCK”, night latches are often found in conjunction with a mortice deadbolt on wooden front doors and in flats. The lock contains a spring loaded bolt named a “latch bolt” which protrudes from the lock case, fitted on the inside of the property. As you shut your door, the bolt automatically locks into place. When on the inside, the lock is opened by turning a knob on the lock case. When on the outside, the lock is opened by inserting and turning a key via the “rim cylinder”.
There is a small catch on the lock case, called a “snib”, which can be operated when inside of the property. The snib can be used keep the bolt retracted (often referred to as “on the latch”) or to prevent it retracting (“deadlocked”). There are two main types of night latch; TRADITIONAL and DEADLOCKING
Traditional – This is the most basic type of night latch as explained above.
Deadlocking – This operates the same as a traditional night latch but also allows you to deadlock the latch bolt from the outside of the property when the door is shut by a turn of the key. This is often referred to as “double locking”.
This is by far the most common lock as it is found on most UPVC doors. Inside the lock there are usually 5 or 6 sets of pins which prevent the lock turning. On inserting the key the pins are aligned so that the lock can then turn. The “Euro” profile cylinder is the most common cylinder profile (shape) and comes in three designs; SINGLE, DOUBLE and THUMBTURN.
Single – When access is only needed from one side, such as a garage.
Double – When access is needed from both sides, such as a front door.
Thumbturn – Same as a double cylinder however, operation from the inside does not require a key.
Multi-point locking mechanism
A multi-point locking mechanism is used most commonly on UPVC doors in conjunction with a euro cylinder. The lock consists of at least three locking points which are attached to side of the door. When the door handle is lifted, the locking points extend simultaneously from the door and bolt into the door frame. The locking points are then locked into place by turning the key.