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Exposed to bad weather, a swinging metal door lock is resistant to corrosion. Its mechanism rust, some parts seize... Replace its spring can give him a second chance.

Portal equipped with a lock with grooves

While some gates are equipped with a security lock reported in the form of a barrel barrel, many of them have a simple lock with integrated security, known as throats, on which it is possible to provide some interventions such as the change of worn grooves or a broken spring. A bad reminder of the bolt cane is indeed often due to the spiral spring broken or tired. New parts can then be purchased from some locksmiths or retrieved from old locks, all designed in the same way.

Identical design for all locks

Gate locks have a dual function. In the lower part, the bolt of cane carries a long rod operated by the operating handle, which allows the opening of the wing by releasing the cane of the striker. In the upper part, a rather massive piece, called deadbolt, provides lock security. It is operated by the key, which acts on a combination of several notches levers, provided with springs with return blade: these are the gorges. The notches of the key lift the grooves and the bolt slides in the headlight light (front of the housing) to engage in the lock, thus securing the closing of the door. In the example presented here, the handle of the handle, which should be horizontal, falls to rest. The action on the handle is soft, the cane beak is hard to get back into the spoilsand sometimes the door refuses to stay closed.

A major piece: the return spring

The return spring of the cane is the cause of this malfunction. It can be broken or greatly weakened. Equipped with a tab that acts on the rod carrying the cane bolt, this spiral spring is installed on a small "pillar" carried by the housing. Although the mechanisms that control the lock and the one that controls the cane bolt are independent, you have to remove the assembly to change the lock. defective spring. Repair is easy and fast. Maintenance requires some sprays of a lubricating spray after each season.

Hanging handle

The handle is pendulous, which indicates a defect of recall of the bolt of cane. The door tends to open, but can be locked without problems.

Removal of the lock

Disassemble the handle

  • Disassemble the handle held by a pin.
  • To do this, remove the pin using a small pliers, then pull the handle attached to the axis.

Remove the lock

  • To remove the lock, remove the countersunk head screws (on the front of the housing).
  • Then remove the screw (s) that connect the housing to the door's lugs.

Dismantling and cleaning the case

Unscrew the back of the case

  • Unscrew the rear face of the housing: a plate carrying the key guide.
  • We distinguish the deadbolt (up) driven by the key and manual closing (bottom).

Take out of the box the piece carrying the bolt of cane

  • Clean the mechanisms and the inside of the case with a brush soaked in white spirit.
  • Take out the coin with the cane bolt. It is on its rear part that acts the lever.

Remove the deadbolt

  • Remove the "bundle" of grooves from its axis, the leaf springs resting on one side of the case.
  • Do not mix them.
  • Remove the deadbolt under which the spiral spring is placed.

Installation of the new return spring

Broken return spring

  • The return spring (here in the foreground) is broken.
  • Install the new one in the correct direction on the square axis of the housing.
  • His leg is engaged in the notch of the stem of the bolt cane.

Coat moving parts with grease

  • Before closing the case, coat all moving parts with multipurpose grease (Bardhal, Castrol, Geb...).
  • Do the same for the return spring and the flat springs of the grooves.

schema of a lock

Tips for DIYers

• When you dismount a tumbler lock (there are 4 or 6 on single locks), locate the initial position of the parts and their order of assembly which is related to the teeth of the key (take a picture or make a small sketch).
• A lock works smoothly without rust attack provided it is lubricated. For this, inject by the key hole, a aerosol lubricant product (3-in one, WD-40, KF). To grease a barrel lock, use a lubricant based on graphite powder (Griffon, Pressol, Thirard...).

Video Instruction: How to Replace Door Locks: Removing Cylinders to Replace Door Lock