Recording tape cassette

Claim 1

A recording tape cartridge comprising: a cartridge case having a front wall, side walls and top and bottom walls for defining a chamber for accommodating a recording tape wound around a tape reel means; a lid member having a flat front plate and a pair of connecting plates projecting from said flat front plate, said lid member being rotatably mounted on said cartridge case with said connecting plates opposed to said respective side walls so as to rotate said flat front plate between a closed position and an opened position; an opening defined on a bottom portion of said flat front plate of said lid member; clearance means of variable width having a front end defined between one of said side walls and corresponding connecting plate of said lid member, said front end of said clearance means being connected with said opening of said lid member, said width of said clearance means being wider in its front portion than in its rear portion; and lid locking means provided in said clearance means for locking said lid member in a closed position, said locking means being operated by a locking release member of a recording device which enters inside said clearance means through said opening for releasing the locking condition of said lid member to open same.