TIRE MOLDING FORMER

PURPOSE:To make the title former simple in structure and applicable to a small-sized tire, by a method wherein a piston is fixed to a shaft having a flow path, a cylinder tube is put over the shaft and further each segment and the tube are connected by a rocking link with each other. CONSTITUTION:When a fluid such as air is fed into a cylinder tube 18 through a flow path 19 opening at a base end side of a piston 17, the cylinder tube 18 is moved to the base end side by resisting bouncing force of a bouncing member 22. The tube 18 abuts against a holding body 36 and segments S... each are in a state where the diameter is expanded most. Then when the fluid in the cylinder tube 18 is discharged through the flow path 19 under this state, the tube 18 is moved until the same abuts against a holding body 35 with the bounding force of the bouncing member 22. In this instance, also hinged points 0a, 0b of rocking links 9a, 9b... each and also hinged points 0a', 0b' of links 9a, 9b... each are moved, segments 1a, 1b each become a state where the diame ter is contracted and a cylindrical body 2 becomes a state where the diameter is contracted. On the contrary, when the fluid is fed into the cylinder tube 18 through the flow path 19, a state where the diameter is expanded is obtained.