Spring bolt device

The utility model relates to a dead lock latch device including a lock latch, an inside and an outside lock latch sleeves to accept the lock latch, anti-sawing pin arranged inside the lock latch, an adjusting rod with one end flexibly connecting with the lock latch through a connecting pin, a toggle rod to drive the lock latch, and a positioning unit of the toggle rod. The adjusting rod is formed by steel sheet pressing, and forms a cavity to accept contain the anti-sawing pin on the end connecting with the lock latch. The toggle rod drives the adjusting rod directly. Since the adjusting rod is pressed by steel sheet, thus the rod has higher strength and can withstand larger axial impact. The cavity formed at the end connecting with the lock latch can contain the anti-sawing pin and is placed into the lock latch together with the anti-sawing pin. A pin hole to contain the anti-sawing pin is no longer required to be provided on the lock latch, which simplified the machining process. By adopting the toggle rod to drive the adjusting rod directly to replace the indirect drive by an intermediate connecting component, the start operation is more flexible, and the quantity of parts being used is reduced with more simple structure, more reliable performance and lower cost.