Locking system and use thereof

Locking system for mounting at a door for locking a room that is provided with at least one door, said locking system comprising a lock holder with a lock, said lock being accessible from the outside of the door, when the lock holder is mounted on the inner side of the door, and a locking boom that is adapted to be mounted at the inner side of the door or an adjacent frame and is provided to be coupled to the lock holder, whereby one end of the locking boom in the locked position of the door is made to abut the inner side of the door, and the opposite end thereof is made to abut a structure adjacent the door, such as a frame or another door, wherein the locking system further comprises at least two toothed wheels that are mounted on the lock holder and are provided to be able to rotate around mutually parallel axes and also have space between two sets of teeth on said at least two toothed wheels for locking said locking boom, and that the lock is further provided to be mounted from the inside and is connected to an arresting device that can engage in the movement area of the toothed wheels for rotation of the teeth on the toothed wheels, and wherein a movable part on the lock is provided to be able to rotate together with said arresting device, so that the toothed wheels can rotate in the open position of the arresting device and cannot rotate in the closed position of the arresting device so that a pull on said door or frame can be transferred to the locking boom in the locked position.