Tripod synchronous expanding mechanism

The utility model discloses a tripod synchronous expanding mechanism which comprises a center seat 10 and a set of stand bar components 20. The tripod synchronous expanding mechanism is characterized in that the center seat 10 comprises three radially distributed planar hinge seat boards 11; the stand bar components 20 comprise three stand bars 21 which are connected with the center seat by planar hinges; local bevel gears which are meshed with each other are arranged at the upper end parts of the three stand bars 21. The three stand bars of a tripod also can be synchronously expanded by three synchronous connecting rods 41, with the local bevel gears, hinged to a center connector 42 or are located by a locating cavity or a locating bulge. The tripod synchronous expanding mechanism disclosed by the utility model is convenient to use, wide in range of application, simple in structure and low in manufacturing cost, and can be widely used for the tripod, used for supporting and fixing, of photoelectric instruments like cameras, vidicons, surveying instruments, and traffic warning signs for vehicle emergency cut-off.