How Does An Old Door Lock Work

This mortise lock set is installed in a 1930 colonial in the boston area. The top of the cylinder contains pins and springs which keep pressure on the keyed pins. There are four parts to a mortise lock other than the mortise itself.

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The two most common types of locks in a home are simple key locks in a doorknob and deadbolt locks.

How does an old door lock work.

To start with you need the right tools for the job. 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. With the door locked the bolt gold 1 is extended into the mortise hole in the doorframe. 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.

Key locks contain a small cylinder that runs down the middle of the doorknob and into the door. 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. 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. Insert the old key and turn it either to the left or right.

This method should work on most pin and tumbler locks that people normally use. Meet the mortise lock and door knobs. Pilot holes through the door to center the 2 1 8 in. 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.

The bolt is held securely in place by metal levers called tumblers 3 cut to various sizes to match the notches in the key. The backset can be 2 3 8 or 2 3 4 in. The key gold 2 is in a vertical position in the lock. This screw should hold the knob securely to the spindle when you turn the knob.

Differences between a mortise lock and a cylinder lock. The bolt of the lock fits into the mortise. Once the key is removed the spring will automatically push the latch back out. Mortise locks are very different and heavier than the usual cylinder locks and in its design they use lever locks as a mechanism.

When the door is unlocked a part called a tang is resting fully inside of the cylinder. Inside the cylinder are all the parts that work together with the key to lock or unlock the door. Remove the cylinder plug from the cylinder the most critical part of this operation is removing the cylinder plug from the cylinder. Notice the set screw on the base of the knob on the right.

At the door edge use the template to drill a 2 in deep pilot hole for drilling for the strike or bolt. The spindle runs through the latch bolt which is inside the door perpendicular to the spindle. 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. A mortise lock needs a mortise or a pocket in the door frame to operate correctly.

Many locksets accommodate both. Drill the door face and mark the jamb.

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