| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the practicability by providing an automatic drawing-out means which can selectively store and draw out an internal casing only by pushing the front plate of the internal casing and is constituted by providing a guide groove for guiding the movement of the free end of a lock pin. SOLUTION: When the internal and external casing 30 and 20 are clamped and the front plate 36 of the internal casing 30 is pushed with specific force, the free end 45 of the lock pin comes out of a drawing-in maintaining groove 46b against a compressed spring and is guided by a protrusion guide groove 46d, so that a grip member 41 protrudes. The free end 45F engages a protrusion maintaining groove 46a by the protruding operation of this hold member 41. The protruding operation of the grip member 41, on the other hand, makes a release while the lock projection 27 of the grip member 41 is held, and the internal and external casings 30 and 20 are released. Namely, the internal casing 30 begins to be drawn out with the force of a leaf spring 53 at the moment when the grip state is removed.</p> |
