Auto -lock nature tool to lock suitable for building field

The utility model discloses an auto -lock nature tool to lock suitable for building field, including lock jar and spring bolt, still including turning round the lid, the spliced pole with turn round cover between still through the rotation torsion spring connect that resets for it can reset to initial position after the wrench movement to turn round the lid, the spring bolt includes the connecting plate, and the bottom of connecting plate is provided with the tapered end, and the top of connecting plate is provided with the wrench movement head, the wrench movement head is installed in spring bolt switching wrench movement guide slot, when turning round the lid at initial position, and wrench movement head and big end wall contact, the tapered end is at the closure state, when turning round when covering the wrench movement to extreme position, wrench movement head and the contact of tip wall, the tapered end is in complete open mode. The utility model discloses an auto -lock nature tool to lock is applicable