| 摘要 |
PURPOSE:To improve a durability of a flat spring by providing a bend at a flat spring base. CONSTITUTION:When a cassette main unit 1 has been mounted at a tape deck and a stopper itself 15 is forced to retreat to a wall 3a side, a tip part of a cut and raised piece 22 receives a pressure which is pushed out from a guide groove 14 and its piece 22 performs a elastic deformation. In this case, a base part 21 of the above piece 22 allows its bend 23a of one side only to be fixed but allows its bend 23b of other side to be movable freely, so that if the base part 21 receives the elastic deformation force of the piece 22, the bend 23b will slide on the wall 3a and makes the base part 21 itself perform the elastic deformation archwise to approach to its wall 3a. As a result, even its base part 21 as well as its cut and raised piece 22 have a elasticity and accordingly the whole flat spring can be composed with thicker materials having rather exceeding rigidity and this configuration renders the flat spring more durable.
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