After renovation, apartments are often installeddoors. However, often brought canvas, not equipped with handles and locks. In this case, you can install the hardware yourself. In addition, the owner of the apartment has the opportunity to choose the castle, which will be the most suitable and convenient. 
The design of the interior door. A well-chosen handles will well complement the interior and make the appearance of the interior door complete. In some cases, it is impossible to pick up the canvas with the finished fittings, and a separate lock installation becomes the only way out.
Why need locks in the interior doors
Many are puzzled why lock the door to the room. However, there are situations when it is simply necessary. 
Lock scheme for interior doors.
Back to contents</a>
Necessary materials and tools
In order not to be distracted from work, you need to prepare everything you need beforehand: 
Tools for mounting the lock for interior doors.
When everything is ready, you can start working. Back to contents</a>
Choice of a place for the castle
First of all, we need to see from whichmaterial is made of a door. If this is a solid wooden canvas, then you can install the lock in any convenient place. The recommended height is 90-100 cm from the floor. But someone can be comfortable at 80 cm or 110 cm. To determine the optimal location, you can simulate the opening of the door. It is advisable to ask family members about it. On the door you need to note the optimal height. 
Replacement of the door handle. If you use a different material, you need to determine where the additional timber is located, since it will be the furniture that will be cut into it. At the doors of the MDF, he is at a height of 1 m from the floor. Before buying a lock, you need to measure the thickness of the door. If the lock does not fit the size, then it will not be possible to install it. The minimum thickness of the door under the lock is 4 cm. It is necessary to check whether the box will withstand the load, whether it is damaged in the place of the intended installation of the lock. Back to contents</a>
The layout of the door and the preparation of the hole for the key
Installation of the lock in the interior doors begins withmarkings. The canvas is removed from the hinges and placed on its side. The end of the latch is marked on the end part. The lock is attached to the sides and contoured along the contour. There, where the key will be inserted, a special mark is made: here it is necessary to drill through the door through and through. On the front side is the height of the lock and the fastening bar. To make a smooth circular notch in the canvas, you need a drill with a crown. Select the diameter of the drill, depending on the lock mechanism: it must fit freely in the recess. But also you need to consider the size of the decorative overlays: the hole must be hidden completely. The stock of space should provide for the possibility of fastening the accessories to the door with the help of self-tapping screws. On the previously made marking, we drill a hole under the bar connecting the handles. Do this on two sides, so as not to damage the canvas when the crown is exiting from the back. Back to contents</a>
Drill holes for the lock mechanism
The layout scheme for installing the lock in the interiorDoor. First, a place is prepared for the lock mechanism. To do this, using a drill bit makes a hole a little more than it. As a result, the whole castle should be easy to enter there, free to fit, but at the same time not to hang out. In order not to be mistaken with the depth, on the drill you need to measure the length of the locking mechanism and make a mark. For these purposes, an insulation tape is suitable: it is wound in several layers in the right place. When the drill drowns in the door, the tape rests against the edges and does not allow the hole to be made deeper than necessary. Depending on the size of the locking mechanism, it may be necessary to drill 2, 3 or more such holes. When they are all ready, they need to be combined. Using a chisel, it is necessary to remove the partitions between the depressions. You can use the file. Then you need to align the notch under the lock. For these purposes, a file with a large notch is suitable. Final processing is done with a tool with a smaller notch. After carrying out the work, it is necessary to clean the debris from the sawdust. Back to contents</a>
Preparation of the place for the bar, the final stage and verification
When the hole is ready, it is appliedthe front panel of the lock, so that the holes under the lock on the door and on the bar coincide. Its outer contour is outlined. Using a hammer and chisel, a groove is made equal to the thickness of the lining. This will insert the bar. She should not stick the door out of the door leaf. If necessary, you need to deepen the notch, otherwise the door will not close. 
Scheme of drill holes for lockmechanism. The control unit of the locking mechanism is now being made. It should be inserted without distortion, it is free to fit in the recess, and the bar without interference should be placed and not protrude from the door. In the prepared holes, a locking mechanism with a tongue is installed. The bar is fixed using two screws. According to the attached scheme, the entire lock is assembled to the interior door, handles and all decorative elements are attached. The mechanism is ready. There is one more detail left. In order for the door to close, there should be a recess on the door post for the tongue of the lock. First you need to determine its location. For this purpose, the place where the latch touches the jamb, its lower and upper boundaries is marked. In the center is a deepening, where the tongue will enter. The notch must be longer than the latch, 2-3 mm. Then a fixing strap is applied and contoured along the contour. The chisel is a notch for the thickness of the lining. If there is a plastic pocket, first it is installed. On top with the help of screws, a decorative cover is attached. If the bar protrudes and prevents the door from closing, the notch needs to be slightly deepened. 
Diagram of the interior door with a lock. The most important moment. To check how the lock mechanism works, you need to look at it in action. Tests must be carried out with the door open. To do this, first just move the handle, follow the ease of movement of the tongue: it should not be seized. Then check the closing and opening with a key. These actions must be performed freely. Only in the event that these manipulations did not cause difficulties, you can try to close and open the door. If any problems occur during the test, it is necessary to disassemble the lock, find out the cause of the faults and eliminate it. Back to contents</a>
What to do if something went wrong
Main problems:
- seizure of the tongue;
- tight rotation of handles;
- key jamming.
Causes:
- The tongue will seize if the lock mechanism is installed too tightly or with a skew;
- The free movement of the latch can be hampered by the chips remaining in the groove;
- because of the skewing of the lock, the handles can be rotated, and the key can not be closed;
- due to the wrong assembly of the handle mechanism, the tongue will not move;
- the key will not close the door if the lock itself is incorrectly assembled, tightened with excessive or insufficient force.
Depending on the detected malfunction, you can:
- To disassemble the lock and extend the recess;
- clean the cut from chips and sawdust;
- set the lock so as to eliminate the skew;
- Reassemble the handles following the instructions;
- Reassemble the lock mechanism.
Slam the lock on the door with your hands prettyjust. For this, it is not necessary to be a master cabinet maker. With the ability to hold a hammer and a chisel, there will be no significant difficulties with how to install the lock in the interior door. The general scheme is always the same, the details may differ depending on the type of mechanism used.
