Patent ID: 6215619
Filing Date: 2001-04-10
Classification: G11B

Abstract:
A tape cassette comprising a housing made up of upper and lower casings, a pair of reels around which a tape is wound and which are turnably contained in the housing, said lower casing holding reel brake shoes that control the rotation of said reels, torsion coil springs of a predetermined inside diameter that control the turning of said reel brake shoes, and brake posts on which said reel brake shoes and said torsion coil springs are set, said upper casing having cylindrical bosses that cover the upper portions of said brake posts of said lower casing, said bosses being contiguous to reel area partition walls formed in the upper casing and having a predetermined height and outside diameter, said upper casing holding a release lever that turns said reel brake shoes, and a coil spring that restricts the movement of said of said release lever, characterized in that a rib having a width and of a height substantially the same as said predetermined height as each said cylindrical boss is formed contiguously thereto, each said rib having dimensions such that the sum of the outside diameter of said cylindrical boss and the width of said rib is greater than the inside diameter of said coil spring that presses said release lever.