My house — my fortress. And the fortress must be strong lock. It is clear even to children. An example of this is Evgeny Lebedev, the pupil 3 classes of school № 3 of the city of Kostroma. Practicing at the station of young technicians, he if the task of the invention has devised a system of linear displacement of the plates, which formed the basis for the design of the attachment of the tripartite lock for locking doors. The proposed closure device is quite simple, but to make it enough of a Vice, drill and a couple files. Mounted it with any rim locks, in this case cylinder Baltic shipyard in St. Petersburg.
The purpose of consoles is to provide vertical movement of the locking rails for extra door lock at the top and bottom. The main element design — two plates with inclined (45° angle) grooves, which include a thumb slide connected to the lock catch. When turning the key the bolt pulls the slide of his finger, moving in the slots of the plates, move one up, another down, and at the same time — and their connected slats, which guides included in the locking brackets in the upper and lower parts of the door frame. That’s the whole mechanic.
Several observations and recommendations regarding the construction and manufacturing details.
