JPH0459705B

This invention relates to a tape protecting cover of a video tape cartridge, especially to a shaft having a groove the shaft being formed integrally with the tape protecting cover. A first and second molds 12 and 14 divided by the parting line 20 have dents 16 and 18 respectively to form a space when both molds are joined. The dent 16 of the first mold 12 is provided with a rectangular pin 22 for forming a groove so that its one end surface 22a may abut to the end wall surface 16a of the dent 16. The front side 22b of the rectangular pin 22 extends so as to extrude to the dent 18 of the mold 14, and is constructed to form an inclined surface 22c between the end surface 22a of the rectangular pin 22 and itself. The end wall surface 18a of the dent 18 of the second metallic mold 14 is formed to have a same inclined angle theta as the rectangular pin so as to abut to the inclined surface 22c of the rectangular pin 22 when both metallic molds are joined.