Patent ID: 7234662

Claim:
A recording tape cartridge comprising: a case accommodating a reel on which a recording tape is wound; a mounting portion formed at an inner face of a ceiling plate of the case, at which sets of two of the guide wall portions are provided in protruding manner; a locking member provided to be slideable in a radial direction of the reel at the mounting portion, the locking member being capable of positioning at a vertical movement-locking position, at which the locking member is interposed between an upper face of the reel and the ceiling plate for blocking movement of the reel in an axial direction of the reel, and a vertical movement-allowing position, at which the locking member is withdrawn from between the upper face of the reel and the ceiling plate for allowing movement of the reel in the axial direction; a switching member which is moved in the axial direction of the reel by a rotation shaft of a drive device, for switching the locking member between the vertical movement-locking position and the vertical movement-allowing position; guide portions provided in protruding manner at the switching member, each of the guide portions being inserted between the respective guide wall portions so as to guide movement of the switching member; an urging member which urges the locking member in the radial direction of the reel; and a disengagement prevention member which retains the locking member such that the locking member does not disengage from the mounting portion, wherein draft angles for removing from dies, of surfaces of the guide portions and surfaces of the guide wall portions, which face each other, are greater than or equal to 0.5°, respectively, and at the vertical movement-allowing position, a clearance between an outside surface of the guide portion at a tip end side thereof and an inside surface of the guide wall portion is larger than or equal to a clearance between the inside surface of the guide wall portion at a tip end side thereof and the outside surface of the guide portion, and the maximum clearance between the outside surface of the guide portion and the inside surface of the guide wall portion is set between 0.05 mm and 0.3 mm, and the locking member contacting the switching member only in the radial direction of the reel by the urging member.