A part of the metal will depress (like a large button), and that will retract the latch bolt and leave the door free to open. For further clarification on what a panic bar is, it is the horizontal length of metal that you push to open a door. Because the tailpiece of the rim cylinder goes straight through the door, if there is a panic bar directly behind the cylinder, then this is a strong indication that the lock you are dealing with is a rim cylinder. Other exterior units are often found on homes or residential doors. The panic bar or exit bar are the most common devices for a rim cylinder to be fixed to in a commercial setting. This may be in the form of a panic bar, exit bar, or some other form of exterior unit. In the case of a rim cylinder, the lock body is going to rest outside of the door. Do to the length of the stem it is not possible to rest the lock with its keyway facing upwards to the sky/ceiling. A rotation of the stem through the door will unlock the device. The stem is rotated by turning the correct key in the cylinder. It is not flat against the back of the cylinder. The tailpiece is a thin length of metal that protrudes from the back of the lock further into the door. The metal along the outside of the cylinder will also be smooth, as opposed to the threaded nature of the mortise cylinder. Without these two screws, the cylinder would simply slip out of the door. This requires you to slide in the lock from the front and then fasten the bolts from the other side of the door. Two bolts secure the cylinder to a thin metal plate located on the other side of the door. The main takeaway is that the lock body resides inside the mortise of the door. The mortise, in this case, will be significantly smaller, not in length, or height, but in width. For glass doors, your mortise may use an Adams Rite deadlatch. If the size of the faceplate is approximately the size of your hand then that is an indication that it uses a mortise cylinder. More specifically investigate where the deadbolt and/or latch bolt extends from.
Examine the length of the door that lines up with the strike plate. In the event that the allusion to antiquated technology does not paint the picture, take a look at the door when it is open. The size and shape relation of the mortise resembles a VHS tape. In the case of a mortise lock, this hole is cut into the side of the door to fit the mortise lock body. The name mortise refers to a hole, or recess, which is designed to fit a corresponding piece. The lock body of a mortise cylinder is its greatest defining characteristic. The existence of a cam is apparent if the removed cylinder can rest flat with the keyway pointing up toward the sky/ceiling. The depression of that button is what opens the lock. A downward turn of the cam unlocks the device by depressing a button within the lock body. When the plug is rotated, the rectangular end will move and open the lock. The round section will be fastened onto the cylinder with screws. Most often it will have a circular shape with a small rectangle coming out of it (resembling a flat Ping-Pong paddle). The tailpiece for a mortise cylinder is flush against the back of the lock. Once you have oriented the cylinder by screwing it in, the lock will function. Nothing will need to be done on the other side of the door. Other than the rotation of the lock cylinder, there is nothing else that is fastening it to the lock body. In order to secure it, you will have to rotate the device so that it threads into the corresponding grooves on the lock body. The cylinder will have threading the outside of the device, which is similar to the threads on a screw. Knowing what type of lock you have will help you to assess your protection, as well as give you the information needed to make adjustments and replace faulty equipment. In order to tell the difference, we will need to examine what the locks look like when they are not installed, and how they appear once they are in use. They come in similar sizes and often have a trim piece that keeps them secure against torsion attacks. While installed, these cylinders look very similar. It can take some inspection in order to figure out just what type of lock you are working with.
On first glance, a rim cylinder may appear no different from a mortise cylinder.
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