To simplify the structure of a transferring device by a method wherein a frame disassembling machine is arranged adjacent to a vacuum molder, which vulcanizingly molds a rubber material in the frame by vacuumizing the interior of vertically separable enclosure frame, so as to engage transferring hooks in the frame between them and a running truck with the projection on the frame.

By actuating the respective transferring devices 13 of a vacuum molder 1 and of a disassembling machine 2, the frames in the vacuum molder 1 and in the disassembling machine 2 to the seating surfaces 3a and 3b of respective running trucks 3 when the running trucks 3 are moved, the respective projections of the frames disengage from the grooves of the hooks of the transferring devices 13 and the respective frames move to the running trucks 3, resulting in bringing the frame filled with rubber material to a position corresponding to the vacuum molder 1. The projection of the frame engages with the groove of the hook of the transferring device 13 of the vacuum molder 1 so as to pull the frame in the molder 1 by means of the retreating of the transferring device 13 in order to vulcanizingly mold the rubber stock filled in the frame. The transferring of the frames can be performed by a simple action through the realization of the release of the engagement between the projection and the hook occurring only by the movement of the running truck and the only projection of the transferring device 13 beyond the running truck realizing the engagement between the hook and the projection.