Magnetic tape cartridge

A magnetic tape cartridge, comprising:

• an opening, which is positioned on a side of a cartridge case lying across a lower half section and an upper half section of the cartridge case, for extracting a magnetic tape;
• and
• a sliding door for opening or closing the opening, which is inserted in a closed position with force imposed by a spring member into lower and upper guides, which are placed in the lower half section and the upper half section of the cartridge case respectively,
• wherein said sliding door and said lower guide of the lower half section are equipped with an engagement device, which is capable of restricting the vertical displacement of said sliding door and guiding said sliding door in its moving direction freely, and
• wherein the said engagement device comprises a rib placed on said sliding door and a groove carved on a guide wall of said lower guide of the lower half section.

A magnetic tape cartridge, comprising:

• an opening, which is positioned on a side of a cartridge case lying across a lower half section and an upper half section of the cartridge case, for extracting a magnetic tape;
• and
• a sliding door for opening or closing the opening, which is inserted in a closed position with force imposed by a spring member into lower and upper guides, which are placed in the lower half section and the upper half section of the cartridge case respectively,
• wherein said sliding door and a side wall of the lower half section are equipped with an engagement device, which is capable of restricting the vertical displacement of said sliding door and guiding said sliding door in its moving direction freely,
• wherein said engagement device comprises a rib formed in said side wall and a groove formed in said sliding door, such that said rib engages with said groove.

A magnetic tape cartridge, comprising:

• an opening, which is positioned on a side of a cartridge case lying across a lower half section and an upper half section of the cartridge case, for extracting a magnetic tape;
• and
• a sliding door for opening or closing the opening, which is inserted in a closed position with force imposed by a spring member into lower and upper guides, which are placed in the lower half section and the upper half section of the cartridge case respectively,
• wherein a restriction device, which restrains said sliding door from falling in the direction normal to the plane of said sliding door, is provided along said lower guide of the lower half section, and
• wherein said restriction device comprises one or a plurality of pins which stand on the base of the lower half section.

A magnetic tape cartridge, comprising:

• an opening, which is positioned on a side of a cartridge case lying across a lower half section and an upper half section of the cartridge case, for extracting a magnetic tape;
• and
• a sliding door for opening or closing the opening, which is inserted in a closed position with force imposed by a spring member into lower and upper guides, which are placed in the lower half section and the upper half section of the cartridge case respectively,
• wherein a restriction device, which restrains said sliding door from falling in the direction normal to the plane of said sliding door, is provided along said lower guide of the lower half section,
• wherein said restriction device comprises a restricting rib which stands on the base of the lower half section, and
• wherein said restricting rib which stands on the base of the lower half section is divided into a plurality of restricting ribs.