| 摘要 |
PURPOSE: An expansion post box is provided to expand capacity of a post box when necessary, thereby improving loading efficiency. CONSTITUTION: An expansion post box has doubly designed both sides each of which has an inner side(200) and an outer side(210), and also has a bottom side which consists of an inner bottom side(220) and an outer bottom side, whereby the inner space of the post box is expanded when the rear side of the post box moves. When pulling a handle, coupling of a right end of a locking loop and locking holes is released. When releasing the handle, by a spring apparatus, the locking loop is coupled to the locking holes so that the inner side and the outer side of the post box are fixed with each other.
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