![]() James Carpenter held the patent for the earliest model of the rim lock which he dubbed ‘Number 60’.Ĭarpenter’s rim lock was birthed as a result of Carpenter seeking to improve upon the then designs of the latch bolt and the mortise lock. The pioneer behind the lock was the ironmonger James Carpenter. The earliest known model of the rim lock (that I could find in my research) can be traced back to 1830 in England. Warded locks use obstructions inside the lock or on the keyway to prevent unauthorized access. These locks are referred to as rim sash locks. Some rim locks combine both locking mechanisms.Rim locks make use of a spring-loaded sliding latch bolt or a deadlocking bolt.The term rim lock usually refers to the installation method and not to the locking mechanism itself.The entire lock body of the rim lock is visible after installation.Rim locks can easily be screwed to the surface of a door. ![]() Most other locks have a lock body fitted into the door itself. They are fitted to the surface of the door. As you can tell, the locking mechanism varies greatly from the more common pin tumbler lock that works by separating pins at the shear line. The key that is meant to fit your rim lock will be shaped appropriately, in such a way that it will easily pass the wards in use. Warded locks make use of wards to prevent unauthorized access if the wrong key is used. You will not be entirely wrong with this assessment. If you assess a rim lock based on its appearance alone, you will come to the conclusion that rim locks are much different than any of the other locks you have come across. A latch is used to secure rim latches, while the combination of a deadlocking bolt and a latch are used on rim sash locks. Rim latches and rim sash locks are the main types of rim locks. Another unique feature of the rim lock is that the key can operate the lock from both ends of the keyway, as is shown here. The key is what is used to engage and disengage the lock or retract and throw the bolt. On the other hand, the deadlock bolt is used in conjunction with a key. Most rim locks with sliding latches make use of handles and knobs. The latch is retracted when pressure is applied and extended when pressure is released. The sliding latch is pressure operated and spring loaded. A rim lock commonly makes use of a sliding latch or a deadlock as its locking mechanisms. Rim locks refer to the installation method, which is a surface mounted installation. The term rim lock can often be misleading because it doesn’t give you any information about the locking mechanism. Replicas are often made from iron, brass, and nickel. ![]() A majority of rim locks were originally made from cast iron. These locks are not suited for entry doors but you can easily find rim locks for interior doors. I will discuss the installation of rim locks in more detail later. Rim locks can be screwed to the surface of a door. As the name suggests, surface mounted rim locks are affixed to the surface of a door. Enough of the chatter though, let’s dive headfirst into learning more about rim locks. This is one of the reasons you will usually find working rim locks on much older buildings. Rim locks are rather old locks, and their core design has not changed much over the years. If you think I’m misleading, check out the history of padlocks or the history of handcuffs, both make for a fascinating read. In addition to their unique design, the rim lock has a rich and fascinating history, as many other locks do. However, the rim lock is not just any other lock. I don’t blame you for being unaware of rim locks, and I won’t blame you for dismissing them as any other lock. You have probably come across a rim lock without actually knowing what it was. Rim locks are a common fixture in many old homes.
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