New building key
The new key or bitting , construction site key , architects key , even janitor key is, that allows you a tool doors can open, still do not have a door fitting with doorknob still have a lock cylinder. This is often the case in a new building when the door frames are installed and then the door is hung. However, the mortise lock is already installed in the door leaf , so that you only have to insert the spike of the new key into the square hole of the door lock to open the door. Higher-quality building keys also have a cylindrical shape with the diameter of the round part of a profile locking cylinder (17 mm) and a lock bit attached to it. If the lock cylinder is not yet available , this key can be inserted into the opening provided for this purpose and is used to extend the bolt from the mortise lock by turning, which enables the door to be temporarily locked. These keys have the stalk often also via an annular scaling in 5-mm intervals, what the determination of the required exterior and interior length is of the required locking cylinder.
As a combination tool, some of these keys still have various triangular keys and square keys of different sizes, e.g. B. also for opening and closing windows where the fittings are still missing, for opening and closing switch and distribution cabinets or for operating ventilation screws on radiators. A small Allen key allows door fittings to be installed. The partially integrated bottle opener results from a corresponding shape of the ridge .
Also Bautüren that remain only during the construction period in the building can be equipped to protect against unauthorized access without doorknob.
