Upper lock system of a passive door blade of a double door

An upper lock system of a passive door blade of a double door, the system comprising a bolt arranged to be installed to an upper surface of the passive door blade and arranged to be controlled by means of a pull bar, wherein the system comprises a lock and an interface part, the lock comprising said bolt and a power transmission connection part for the interface part, the interface part comprising a grabber module, a power transmission mechanism and a resilient means, the grabber module being arranged to linearly move between an extended position and a retracted position and the resilient means being arranged to push the grabber module towards the extended position,

• the power transmission mechanism being operationally connected to the grabber module and the power transmission connection part, a position of the power transmission mechanism depending on a position of the grabber module,
• in which retracted position the grabber module being arranged to form a connection to the pull bar and the lock being in open state, and in which extended position the grabber module being arranged to maintain the connection between the pull bar and the grabber module and the lock being in the locked state, the connection additionally being disengageable in the extended state,
• wherein the power transmission mechanism is rotatably attached to the body of the interface part and the power transmission mechanism comprises a first protrusion and a second protrusion, the first protrusion being connected to the power transmission connection cart and the second protrusion being operationally connected to the grabber module, and
• wherein the spring is a compression spring, a center chamber of which is arranged as an extension of the chamber.