Fire Bolt Assembly with Melting Stop Member and Locking Stick

The patent introduces a stick as an intermediary component that acts as a mechanical wedge between the positioning bolt and the receiving tube. The stick translates the melting action of the stop member into direct mechanical force that pushes the positioning bolt outward, eliminating dependence on spring elasticity. This intermediary mechanism ensures reliable door locking even when the spring loses its elastic properties during fire.

The patent merges the stop member with the stick by making them integral parts of each other. The stop member is formed as an extension of the stick, creating a unified component that performs both functions: holding the positioning bolt in retracted position through the stop member and pushing the bolt outward through the stick. This merging reduces the number of separate parts while maintaining the desired fire response reliability.

The patent utilizes parameter changes in the stop member's physical state. The stop member transitions from a solid structural form that physically blocks the positioning bolt during normal conditions to a melted state during fire that allows the stick to push the bolt outward. This parameter change (phase transition from solid to liquid) provides a simple yet effective mechanism for achieving reliable security during normal conditions while enabling automatic release during fire without significantly increasing overall mechanism complexity.