Flexible magnetic disc cassettes with separable cassette cases

A cassette case for flexible magnetic discs comprising:

• a pair of planar cassette case halves having a pair of interior surfaces and formed of a synthetic resin material;
• and
• a number of frictionally interlocked pairs of male and female detent members which join said pair of cassette case halves one to another in face-to-face relationship;
• each of said male detent members begin formed as a one-piece structure with one of said cassette case halves, and each of said female detent members being formed as a one-piece structure with the other of said cassette case halves;
• wherein
• said pairs of male and female detent members each have a continuous peripheral edge which defines a generally annular interengagement region having a width dimension measured parallel to the plane of said cassette case halves, and a depth dimension measured perpendicular to the plane of said cassette case halves between said interior surfaces, wherein said width dimension is at least twice said depth dimension, and wherein
• said pairs of said male and female detents are frictionally interlocked with one another along said continuous peripheral edges thereof.

A relatively thin microdisc cassette case having a generally rectangular parallelpiped shape adapted to house therewith a standardized 3.5-inch flexible magnetic disc, said cassette case comprising:

• a pair of opposing planar cassette case halves;
• and
• a number of registered male and female detent members for joining said cassette case halves one to another in face-to-face relationship;
• said registered male and female detent members being in an interference friction fit with one another to securely join the cassette case halves one to another yet allow the cassette case halves to be separable upon application of a separatory face of sufficient magnitude;
• wherein
• said male detent members are provided by a number of discrete male wall members which convergingly outwardly project from said one of said cassette case halves, and said female detent members are provided by a number of discrete walls which project divergingly outwardly form another one of is a cassette case halves;
• and wherein
• said male and female wall members define an annular interengagement region such that said male wall members are laterally frictionally engaged with a respective female wall member within said annular interengagement region defined thereby.

A cassette case for flexible magnetic discs comprising:

• a pair of planar cassette case halves formed of a synthetic resin material;
• and
• a number of frictionally interlocked pairs of male and female dent members which join said pair of cassette case halves one to another in face-to-face relationship;
• each said male detent member being provided by a number of discrete male wall members each of which is formed as a one-piece structure with one of said cassette case halves, and each said female detent member being provided by a number of discrete female wall members each of which is formed as one-piece structure with the other of said cassette case halves;
• wherein
• said male wall members convergingly outwardly project from said one of said cassette case halves, and said female wall members divergingly outwardly project from said another one of said cassette case halves in diverging relationship to one another;
• and wherein
• said male and female wall members of said pairs of male and female detent members have edges which define a generally annular interengagement region having a width dimension measured parallel to the plane of said cassette case halves which is at least twice its depth dimension as measured perpendicular to the plane of said cassette case halves, wherein said male wall members are laterally functionally interlocked with respective female wall members along said annular interengagement region.