How Does An Old Door Lock Work

This mortise lock set is installed in a 1930 colonial in the boston area. The backset can be 2 3 8 or 2 3 4 in. Inside the cylinder are all the parts that work together with the key to lock or unlock the door.

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Notice the set screw on the base of the knob on the right.

How does an old door lock work.

The bolt is held securely in place by metal levers called tumblers 3 cut to various sizes to match the notches in the key. To start with you need the right tools for the job. The bolt of the lock fits into the mortise. The spindle runs through the latch bolt which is inside the door perpendicular to the spindle.

When the door is unlocked a part called a tang is resting fully inside of the cylinder. This screw should hold the knob securely to the spindle when you turn the knob. Remove the cylinder plug from the cylinder the most critical part of this operation is removing the cylinder plug from the cylinder. With the door locked the bolt gold 1 is extended into the mortise hole in the doorframe.

The key to match the particular lock lifts the pins to the correct height to allow the latch the part that protrudes into the door frame to be pulled back against the spring allowing the door to open. Because it uses the strength of the door frame a mortise lock is far more secure than other locks that attach to the outside of a door frame. Using a drill with a bubble level or a torpedo level taped on top drill halfway through the door from each side with the hole saw to prevent blowout splintering. There are four parts to a mortise lock other than the mortise itself.

Differences between a mortise lock and a cylinder lock. Meet the mortise lock and door knobs. This method should work on most pin and tumbler locks that people normally use. At the door edge use the template to drill a 2 in deep pilot hole for drilling for the strike or bolt.

Drill the door face and mark the jamb. A mortise lock needs a mortise or a pocket in the door frame to operate correctly. The key gold 2 is in a vertical position in the lock. The two most common types of locks in a home are simple key locks in a doorknob and deadbolt locks.

Pilot holes through the door to center the 2 1 8 in. Many locksets accommodate both. Once the key is removed the spring will automatically push the latch back out. Insert the old key and turn it either to the left or right.

Key locks contain a small cylinder that runs down the middle of the doorknob and into the door. The top of the cylinder contains pins and springs which keep pressure on the keyed pins. Mortise locks can function for decades in fact these locks are found in old houses and buildings and they have resisted the bad weather and time. You will require one wrench to apply tension to the lock cylinder and one long pick to actually get the pins of the lock to move.

Mortise locks are very different and heavier than the usual cylinder locks and in its design they use lever locks as a mechanism. Knobs spindle and latch a standard doorknob lock set consists of a pair of knobs one on each side of the door that are connected through the door by a spindle and held together by mounting bolts.

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