Types of door locks.
Flat or box-shaped clasps have the box-shaped form and or (scarves) are screwed on a door track bed, or inserted into an alcove in a door track bed (rabbeted box-shaped clasps). Small flat doors lock approach for additional protection at use bessuvaldnyh clasps, them lock, as a rule, a key of a type of English. Such clasps or have from the inside a rotary head, or open a key from both parties. However as additional clasps they provide reliability only at massive doors and their good making fast. Thanks to additional constructive measures, such as wedge ratchet, a safety slide and etc., their reliability raises.
Cylindrical clasps, or as them still name, English, consist of a box lock and the cylinder inserted into it. Such clasps have not less than five levers, executed in the form of pins and consequently are rather reliable. Additional protection against breaking is represented by the cylinder clasp established in the drilled aperture. The cylinder should be established so that outside of it it was impossible to unscrew and pull out or push inside. Hence, it should or not to leave for a surface of a door track bed, or to be protected by a battening plate screwed from the interior of a premise.
Cylindrical clasps, or as them still name, English, consist of a box lock and the cylinder inserted into it. Such clasps have not less than five levers, executed in the form of pins and consequently are rather reliable. Additional protection against breaking is represented by the cylinder clasp established in the drilled aperture. The cylinder should be established so that outside of it it was impossible to unscrew and pull out or push inside. Hence, it should or not to leave for a surface of a door track bed, or to be protected by a battening plate screwed from the interior of a premise.