| 摘要 |
PROBLEM TO BE SOLVED: To provide a casing for writing utensils, which is so designed that a gate mark appears on an inner face of a top end port of the casing, the gate mark is inconspicuous, and the external appearance of the casing is made better, and which is capable of supporting a refill, or obtaining a desired dimensional accuracy at a place of guiding the refill, irrespective of appearance of the gate mark on the inner face of the top end port of the casing. SOLUTION: Refill support protrusions 5 whose inscribed diameter is slightly larger than the outside diameter of a refill are provided at a plurality of places in the peripheral direction on an inner face of an inner part in a top end port 4 of a casing, through which the refill is penetrated. Further, an expanded port 7 whose inside diameter is larger than the inscribed diameter at places where the refill support protrusions 5 are provided, and which is so designed that a gate mark 6 appears at a place on its inner face is provided outside the places where the refill support protrusions 5 are provided, and at an inlet portion of the top end port 4 of the casing. |
