The fire-safe deadlock design was primarily concern about safety during fire break out or other similar fire accident. This provides a fastest and easiest route to get out from a place.
People are concerned about their property and thinking of ways to protect it and thus locks were created. It exists since century ago and it became the most reliable way to protect one’s stuff. Locks exist until today and it keep on improving one after another. There were already hundreds of types and design in the market now for different usage and function.
Although there are many types of locks, the similarities among them are being made to be tough and durable. Locks can be very tough to break and without tools, it may be only possible to open with the correct keys. A fire breakout may cause people flustering, forgetting the keys location or unable to reach the key location.
In this design, the lock will be modified or remake so that it is possible to open lock with the correct keys but only with some conditions. The lock must be made to act like a normal lock on usual but only unlock during fire breakout. The design of the lock is such that electronic devices are not allowed to be used because it is possible for it to fail during the breakout.
During the actuator design phase, ideas of few type of design will be design out in sketch. Solid and liquid state material will be taken account for the actuator. The actuator designs end up with bimetallic strip, where it can bend when heat is applied. This part is then included into the hull of the lock.
The material for the pins is Indalloy 1 which has low melting temperature (118°C). This material is used to cooperate with the actuator. While reaching the actuating temperature, the alloy will melt thus it free the plug to move so that people could unlock it.
The route that the heat moves in this fire-safe deadlock is started from the heat plate which expose to the outer lock. From this plate, it will be conducted to the heat transfer plate, spring pin cover, spring pin and finally reaching the upper pins.
With all the theoretical calculation, it proofs that this fire-safe deadlock would active at 11.2 second to 13.2 second.