FLAT FILE BACK WIDTH PART REINFORCEMENT PLATE

To solve the problem of breaking of the end edge of a backbone caused by lost endurance against a concentrated load during taking-out when weight increases due to the increase of an inner capacity or the end edge of the backbone is frequently used to become soft and weak in a conventional flat file.SOLUTION: The surface strength of an upper end edge is increased by pinching the inner and outer surfaces of the upper end edge of a backbone by a flat plate made of a soft material, and the strength in the vicinity of the entire backbone (A surface, B surface) in a horizontal direction is simultaneously increased. The strengths of the upper end edge of a flat file and the surroundings are simply and easily increased by attaching an article of the present invention to a flat file binding armor (2).SELECTED DRAWING: Figure 3 【課題】 従来のフラットファィルは、内容量が増え重くなった場合や、背表紙の端縁が多使用により柔らかく弱くなってくると、取り出し時の集中荷重に耐えられず背表紙の端縁が破れる不具合を生じていた。【解決手段】本願発明は、背表紙上端縁の内面と外面を、軟質材から成る平板状の板で挟んで、上端縁の面強度を上げるのと共に、さらに、背表紙（Ａ面、Ｂ面）全体横方向近傍の、強度も同時に上げようとするものであって、フラットファイルのとじ具足（２）部に本願発明の物品を取り付けることで、簡単容易にフラットファイル上端縁部、及び、周囲の強度も上げるものである。【選択図】 図３