JP4236162B2

JP4236162B2 - Paper box

Info

Publication number: JP4236162B2
Application number: JP2003094442A
Authority: JP
Inventors: 裕二竹内
Original assignee: 古林紙工株式会社
Priority date: 2003-03-31
Filing date: 2003-03-31
Publication date: 2009-03-11
Anticipated expiration: 2023-03-31
Also published as: JP2004299732A

Description

【０００１】
【発明の属する技術分野】
この発明は、菓子などを収容する蓋付きの紙製箱に関するものである。
【０００２】
【従来の技術】
従来の蓋付きの紙製箱として、例えば、特許文献１に記載のものがあり、この紙製箱２０は、図１０に示すように、底板２１に対し前後側板２２，２３及び左右側板２６’，２７’が立ち上げられ、前側板２２の上端縁に連設された主蓋板２４が、その主蓋板２４の上端縁の折目線ｒを介して内側に折り曲げられる。また、後側板２３の上端縁に連設された副蓋板２５が、その後側板２３の上端縁の折目線ｒを介して内側に折り曲げられて、さらに、その副蓋板２５の前端にある前壁３０が折目線ｒを介し下方に折り曲げられ、その前壁３０が前側板２２に重ねられる。前記前後側板２２，２３の両側縁には、舌片２９が連設されており、その舌片２９を折目線ｒを介して内側に折り曲げて、その状態で、前記左右側板２６’，２７’、及び、主蓋板２４から立ち上げられた左右側板２６，２７を重ねて閉じてそれぞれ張り合わせ、箱体２０を成す。
【０００３】
前記主蓋板２４から前側板２２にかけて、ミシン目ａで後方を除く３方を囲まれた開放片２８が設けられ、その開放片２８外面は、副蓋板２５及び前壁３０の内面に貼り合わされる。
【０００４】
副蓋板２５には、その後端近くの前記後側板２３上端縁と前記開放片２８の後端縁との間に位置して、横方向全長に亘る折目線ｒが設けられ、その副蓋板２５には、前記横方向全長に亘る折目線ｒよりも後方へ突出する係止片３２が切り目線ｅにより形成されており、前記係止片３２が前記主蓋板２４上面に重なりあうようになっている。
【０００５】
図９に示すように、副蓋板２５及び開放片２８を、前記横方向の折目線ｒを介して主蓋板２４から起立させることにより、前記開放片２８が前記ミシン目ａを介して主蓋板２４及び前壁２５から切り取られて、箱体２０が開放する。このとき、後方へ突出した前記係止片３２の先端が、前記主蓋板２４の上面へ当接しながらその当接部分を押し下げて、箱体の後方から前方へ向かって移動し、やがて開放片２８の開度が主蓋板２４に対して９０°を超えると、主蓋板２４の復元力により係止片３２が押し上げられる。この押し上げにより、開放片２８が後方へ傾くように付勢されて、副蓋板２５及び開放片２８の起立状態が維持される。
【０００６】
【特許文献１】
特開平１１−３２１８５５号公報
【０００７】
【発明が解決しようとする課題】
この紙製箱では、係止片３２は、副蓋板２５に設けられ、その係止片３２の先端が主蓋板２４上面に当接して、その主蓋板２４を、図９に示す矢印の方向へ押し下げる。このため、前記副蓋板２５の開閉を繰り返すと、その主蓋板２４の係止片３２による当接部分が、図中に破線ｆで示すように、底板２１側へ下がった状態に歪んでしまうことがある。
【０００８】
上記のように主蓋板２４が歪んでしまうと、主蓋板２４は、前記係止片３２を押し上げる力が弱くなるので、副蓋板２５及び開放片２８の起立状態が維持されにくくなる。
【０００９】
そこで、この発明は、蓋板の開閉を繰り返した際に、その蓋板の開放状態を維持する機能が弱くならないようにすることを課題とする。
【００１０】
【課題を解決するための手段】
上記の課題を解決するために、この発明の紙製箱は、１枚のブランクからなり、底板の前後端にそれぞれ折目線を介して前後側板を連設し、さらにその両側板の上縁にそれぞれ折目線を介して主蓋板又は副蓋板を連設し、前記底板の両側縁又は主蓋板の両側縁に折目線を介して左右の側板を連設する。前記副蓋板は、その後縁近くに横方向全長に亘る折目線が形成されて、その折目線を介し起伏可能となり、前記主蓋板には全周囲がミシン目で囲まれた開放片が形成される。
【００１１】
前記底板に対し、各側板が折目線を介して立ち上げられ、前側板に対し主蓋板が折目線を介して内側に折り曲がるとともに、後側板に対し、副蓋板が折目線を介し内側に折り曲げられて前記主蓋板上面に重ねられて開放片に貼り合わされている。
【００１２】
その開放片周囲のミシン目の一部は、前記副蓋板の横方向の折目線にその同一線上に沿って形成されており、前記副蓋板の前記横方向の折目線から前方には、切り目により固定片が形成され、開放片の後縁には前記係止片に対応する後方に延びる係止片が形成されている。このため、前記副蓋板を前記横方向全長に亘る折目線を介して起立すると、その副蓋板に貼り合わされた開放片が、ミシン目を介して主蓋板から切り取られ、箱が開放されるとともに、主蓋板の固定片の先端縁が、開放片の係止片の上面に当接して、その副蓋板の起立状態を維持する。
【００１３】
起伏可能な係止片が上下反転して、その上面が、水平な固定片の先端に当接することにより、副蓋板の開放状態となるので、係止片は、前記固定片及び主蓋板をあまり押し下げることなく開放状態に移行できる。このため、副蓋板の開閉が軽やかになるとともに、主蓋板に歪みを発生させにくい。
【００１４】
また、箱を構成するブランクを紙製としているので、係止片、固定片同士の係わり合いが弾性をもってなされ、副蓋板及び開放片を軽く開閉できる。
【００１５】
さらに、上記の構成の紙製箱において、前記係止片は、前記開放片に代えて副蓋板に切り目により設けられ、その副蓋板の前記横方向の折目線から後方に延びるように形成し、前記固定片は、前記副蓋板に代えて主蓋板に前記ミシン目により設けられ、前記係止片に対応するよう前記副蓋板の前記横方向の折目線よりも前方に延びるように形成した構成も採用し得る。
【００１６】
このようにすれば、副蓋板に設けた係止片は、初回の開放動作により、主蓋板に設けた固定片を押し下げながら開放するが、一旦開放した副蓋板を閉鎖方向に回転すると、前記係止片は固定片の下方に差し込まれた状態で、副蓋板が閉鎖される。このため、２回目以降の副蓋板の開放動作では、固定片はあまり押し下げられない。
【００１７】
【発明の実施の形態】
この発明に係る紙製箱の一実施形態を図１乃至図４に示し、この実施形態の紙製箱は、図４のブランクの展開図に示すように、底板１の前後端にそれぞれ折目線ｒを介して前後側板２，３を連設し、さらにその両側板２，３の上縁にそれぞれ折目線ｒを介して主蓋板４又は副蓋板５を連設し、前記底板１の両側縁に折目線ｒを介して左右の側板６’，７’を、主蓋板４の両側縁に折目線ｒを介して左右の側板６，７を連設している。
【００１８】
前記副蓋板５は、その後縁近くに横方向全長に亘る折目線ｒが形成されて、その折目線ｒを介し起伏可能となり、前記主蓋板４には全周囲がミシン目ａで囲まれた開放片８が形成されている。また、前後側板２，３の両側縁には、折目線ｒを介して舌片９をそれぞれ連設している。
【００１９】
このブランクを、図１に示すような箱１０に組み立てるには、まず、前後側板２，３に対して舌片９を、それぞれ折目線ｒを介して内側に折り曲げ、前記底板１に対して左右側板６’，７’及び前後側板２，３を、それぞれ折目線ｒを介して立ち上げる。そして、前側板２に対して主蓋板４を折目線ｒを介して内側に折り曲げるとともに、後側板５に対して副蓋板５を折目線ｒを介して内側に折り曲げ、その副蓋板５を折り曲げられた前記主蓋板４上面に重ねて、副蓋板５の下面をその主蓋板４の開放片８の上面に貼り合わせる。また、前記主蓋板４に対して左右側板６，７を、それぞれ折目線ｒを介して内側に折り曲げ、側板６，６’と側板７，７’を、それぞれ前記舌片９を箱内に取り込んだ状態で重ねて貼り合わせることにより、箱１０となる。
【００２０】
この箱１０を開封する際には、図２に示すように、前記副蓋板５を前記横方向全長に亘る折目線ｒを介して主蓋板４から起立させる。このとき、副蓋板５に貼り合わされた前記開放片８は、前記ミシン目ａを介して主蓋板４から切り取られて副蓋板５とともに起立するので、箱１０の上面が開放する。
【００２１】
この開放片８周囲のミシン目ａのうち、後側板５側に位置する部分は、前記副蓋板５を起立させる横方向の折目線ｒに、その同一線上に沿って形成されている。このミシン目ａと折目線ｒとは、完全な同一線上にあることは求められず、若干前後に位置がずれた状態であってもよい。
【００２２】
また、副蓋板５の前記横方向の折目線ｒから前方には、切り目ｂにより固定片１１が折目線ｒから前方に突出して形成され、開放片８の後縁には、前記固定片１１に対応する後方に延びる係止片１２がミシン目ａにより突出して形成されている。
【００２３】
図３に示すように、前記副蓋板５を矢印の方向へ起立させた際、副蓋板５の固定片１１の先端縁が、上下反転した開放片８の係止片１２の上面に当接して、その副蓋板５の起立状態を維持する。このようにすれば、固定片１１と係止片１２は、相互に弾性をもって適度に撓みながら接するので、副蓋板５の開閉がスムースである。また、図示するように、固定片１１の先端縁が、ほぼ水平な状態で前記係止片１２の上面に当接して、副蓋板５を開放状態に維持するので、固定片１１が係止片１２に押し下げられる撓み度合が少なくてすむ。
【００２４】
この箱１０の副蓋板５を閉鎖する際には、図２に示す起立状態の副蓋板５を、図１に示すように主蓋板４上に伏せる。このとき、副蓋板５の前記開放片８前端縁付近に切り目線ｃが設けられ、その切り目ｃにより差込片１３が、開放片８前端縁より前方に突出して形成される。その差込片１３を、主蓋板４前縁のミシン目ａよりその主蓋板４の下方へ前方に向かって挿し入れることにより、副蓋板５が主蓋板４に係止される。このようにすれば、一旦開放した副蓋板５を、再度閉鎖してその状態で固定できる。なお、この差込片１３の機能を求めない場合には、差込片１３及び切り目線ｃを省略し得る。
【００２５】
この実施形態では、前記固定片１１及び係止片１２を、左右側板６，７の間の中程に設けたが、この実施形態には限定されず、図５及び図６に示すように、複数設けた構成を採用し得る。またその設置位置は、左右方向中程には限定されず、左右側板６，７に近い左右方向両端部に設けてもよい。
【００２６】
また、底板１の両側縁に左右側板６’，７’を、主蓋板４の両端縁に左右側板６，７を設けたが、側板を底板１又は主蓋板４のいずれか一方に設ける構成としてもよい。
【００２７】
他の実施形態として、図７及び図８に示すように、前記固定片１１を副蓋板５にではなく主蓋板４に、前記係止片１２を開放片８にではなく副蓋板５に設けるようにした構成を採用し得る。
【００２８】
図７に示すように、係止片１２は、切り目線ｄにより副蓋板５に設けられ、副蓋板５の前記横方向の折目線ｒから後方に延びるように形成されており、前記固定片１１は、前記ミシン目ａにより主蓋板４に設けられ、開放片８を切り取った状態において、その固定片１１が、前記係止片１２に対応するよう前記副蓋板５の前記横方向の折目線ｒよりも前方に延びるように形成されている。
【００２９】
図８（ａ）に示すように、前記副蓋板５を矢印の方向へ回転させると、副蓋板５は、主蓋板４の固定片１１を押し下げながら起立する。図８（ｂ）に示すように、副蓋板５が完全に開くと、固定片１１が水平状態に復帰して、その先端縁が副蓋板５の係止片１２の上面に当接して、その副蓋板５の起立状態を維持する。次に、副蓋板５を閉鎖すると、図８（ｃ）に示すように、副蓋板５が矢印の方向へ回転するとともに、前記係止片１２は、固定片１１の下方に差し込まれた状態となる。このため、一旦開封した箱１０と未開封の箱１０とは、前記固定片１１と係止片１２との上下の位置関係が異なるので、開封の有無を一目で区別しやすい。
【００３０】
また、図８（ｃ）に示すように、固定片１１は、係止片１２により上方へ押し上げられるので、固定片１１及び主蓋板４の歪みが生じにくく、その後の再度の開閉動作においては、図８（ａ）に示すように固定片１１を押し下げることなく、軽くスムースに副蓋板５を開放できる。
【００３１】
【発明の効果】
この発明は、以上のようにしたので、蓋板の開閉が軽くなり、また、開閉動作を繰り返しても、蓋板を開放状態に維持する機能が保たれる。
【図面の簡単な説明】
【図１】一実施形態の組立状態を示す斜視図
【図２】同実施形態の開蓋状態を示す斜視図
【図３】図２の要部拡大断面図
【図４】図２の展開図
【図５】他の実施形態の開蓋状態を示す斜視図
【図６】図５の展開図
【図７】他の実施形態の要部拡大図
【図８】図７の要部拡大断面図
【図９】従来例の斜視図
【図１０】図８の展開図
【符号の説明】
１，２１底板
２，２２前側板
３，２３後側板
４，２４主蓋板
５，２５副蓋板
６，６’，２６，２６’ 左側板
７，７’，２７，２７’ 右側板
８，２８開放片
９，２９舌片
１０，２０紙製箱
１１固定片
１２，３２係止片
１３，３３差込片
２４蓋板
３０前壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper box with a lid for storing confectionery and the like.
[0002]
[Prior art]
As a conventional paper box with a lid, for example, there is one described in Patent Document 1. This paper box 20 has front and rear side plates 22, 23 and left and right side plates 26 'with respect to a bottom plate 21, as shown in FIG. , 27 ′ are raised, and the main lid plate 24 connected to the upper end edge of the front side plate 22 is bent inward via the crease line r of the upper end edge of the main lid plate 24. Further, the sub lid plate 25 connected to the upper end edge of the rear side plate 23 is bent inward through the crease line r of the upper end edge of the rear side plate 23, and further, the front lid plate 25 is located at the front end of the sub lid plate 25. The wall 30 is bent downward via the crease line r, and the front wall 30 is superimposed on the front side plate 22. Tongue pieces 29 are continuously provided on both side edges of the front and rear side plates 22 and 23. The tongue pieces 29 are bent inwardly through the crease line r, and in this state, the left and right side plates 26 'and 27'. The left and right side plates 26 and 27 raised from the main lid plate 24 are overlapped and closed to form a box 20.
[0003]
An open piece 28 is provided from the main cover plate 24 to the front side plate 22 and is surrounded by three perforations a except for the rear, and the outer surface of the open piece 28 is attached to the inner surfaces of the sub cover plate 25 and the front wall 30. Combined.
[0004]
The sub lid plate 25 is provided between the upper end edge of the rear side plate 23 near the rear end and the rear end edge of the open piece 28, and is provided with a crease line r extending over the entire length in the lateral direction. 25, a locking piece 32 protruding rearward from the crease line r extending over the entire length in the lateral direction is formed by a cut line e so that the locking piece 32 overlaps the upper surface of the main lid plate 24. It has become.
[0005]
As shown in FIG. 9, by raising the sub lid plate 25 and the open piece 28 from the main lid plate 24 via the transverse crease line r, the open piece 28 is mainly connected via the perforation a. The box 20 is opened by being cut off from the cover plate 24 and the front wall 25. At this time, the front end of the locking piece 32 protruding rearward pushes down the abutting portion while abutting against the upper surface of the main lid plate 24, and moves from the rear to the front of the box body. When the opening degree of 28 exceeds 90 ° with respect to the main lid plate 24, the locking piece 32 is pushed up by the restoring force of the main lid plate 24. By this push-up, the open piece 28 is urged to tilt backward, and the standing state of the sub lid plate 25 and the open piece 28 is maintained.
[0006]
[Patent Document 1]
JP-A-11-321855 [0007]
[Problems to be solved by the invention]
In this paper box, the locking piece 32 is provided on the sub lid plate 25, the tip of the locking piece 32 abuts on the upper surface of the main lid plate 24, and the main lid plate 24 is moved to the arrow shown in FIG. Push down in the direction of. For this reason, when the opening / closing of the sub lid plate 25 is repeated, the contact portion of the main lid plate 24 by the locking piece 32 is distorted to the state where it is lowered to the bottom plate 21 side as shown by the broken line f in the figure. It may end up.
[0008]
If the main lid plate 24 is distorted as described above, the main lid plate 24 has a weak force for pushing up the locking piece 32, so that the standing state of the sub lid plate 25 and the open piece 28 is hardly maintained.
[0009]
Accordingly, an object of the present invention is to prevent the function of maintaining the open state of the cover plate from being weakened when the cover plate is repeatedly opened and closed.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the paper box of the present invention is composed of a single blank, and front and rear side plates are connected to the front and rear ends of the bottom plate via crease lines, respectively. A main cover plate or a sub-cover plate is connected to each other via a crease line, and left and right side plates are connected to both side edges of the bottom plate or both side edges of the main cover plate via crease lines. The sub lid plate is formed with a crease line over the entire length in the lateral direction near the rear edge thereof, and can be undulated through the crease line, and the main cover plate has an open piece surrounded by perforations. Is done.
[0011]
With respect to the bottom plate, each side plate is raised through a crease line, the main cover plate is bent inward through the crease line with respect to the front plate, and the sub cover plate is inward with respect to the rear side plate through the crease line. And is overlapped on the upper surface of the main lid plate and bonded to the open piece.
[0012]
A part of the perforation around the open piece is formed along the same line as the transverse crease line of the sub lid plate, and forward from the lateral crease line of the sub lid plate, A fixing piece is formed by the cut, and a locking piece extending rearward corresponding to the locking piece is formed at the rear edge of the opening piece. For this reason, when the sub lid plate is erected through the fold line extending over the entire length in the lateral direction, the open piece bonded to the sub lid plate is cut off from the main lid plate through the perforation, and the box is opened. At the same time, the leading edge of the fixed piece of the main cover plate comes into contact with the upper surface of the locking piece of the open piece, and the standing state of the sub cover plate is maintained.
[0013]
The undulating locking piece is turned upside down and its upper surface comes into contact with the tip of the horizontal fixing piece, so that the sub lid plate is opened, so that the locking piece includes the fixing piece and the main lid plate. It is possible to shift to the open state without pressing down too much. For this reason, the opening and closing of the sub lid plate is light and the main lid plate is less likely to be distorted.
[0014]
Further, since the blank constituting the box is made of paper, the engaging piece and the fixed piece are engaged with each other with elasticity, and the sub lid plate and the open piece can be opened and closed lightly.
[0015]
Further, in the paper box configured as described above, the locking piece is formed by a cut in the sub lid plate instead of the open piece, and is formed to extend rearward from the lateral fold line of the sub lid plate. The fixing piece is provided on the main lid plate by the perforation instead of the sub lid plate, and extends forward from the lateral fold line of the sub lid plate so as to correspond to the locking piece. The configuration formed in the above can also be adopted.
[0016]
In this way, the locking piece provided on the sub lid plate is opened while pushing down the fixed piece provided on the main lid plate by the first opening operation, but once the opened sub lid plate is rotated in the closing direction. The sub lid plate is closed with the locking piece inserted below the fixed piece. For this reason, in the second and subsequent opening operations of the sub lid plate, the fixed piece is not pushed down much.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a paper box according to the present invention is shown in FIGS. 1 to 4, and the paper box of this embodiment has crease lines at the front and rear ends of the bottom plate 1 as shown in the development view of the blank in FIG. The front and rear side plates 2 and 3 are connected through r, and the main cover plate 4 or the sub cover plate 5 are connected to the upper edges of both side plates 2 and 3 through the crease line r, respectively. Left and right side plates 6 ′ and 7 ′ are connected to both side edges via a crease line r, and left and right side plates 6 and 7 are connected to both side edges of the main lid plate 4 via a crease line r.
[0018]
The sub lid plate 5 is formed with a crease line r extending in the lateral direction near the rear edge thereof, and can be undulated through the crease line r, and the main lid plate 4 is surrounded by perforations a. An open piece 8 is formed. In addition, tongue pieces 9 are connected to both side edges of the front and rear side plates 2 and 3 via a crease line r.
[0019]
In order to assemble this blank into a box 10 as shown in FIG. 1, first, tongue pieces 9 are folded inwardly with respect to the front and rear side plates 2, 3, respectively, and the left and right sides with respect to the bottom plate 1. The side plates 6 'and 7' and the front and rear side plates 2 and 3 are raised through the crease line r, respectively. Then, the main lid plate 4 is folded inward with respect to the front side plate 2 through the crease line r, and the sub lid plate 5 is folded inward with respect to the rear side plate 5 through the crease line r. Is overlapped on the upper surface of the bent main lid plate 4, and the lower surface of the sub lid plate 5 is bonded to the upper surface of the open piece 8 of the main lid plate 4. Further, the left and right side plates 6 and 7 are folded inward with respect to the main lid plate 4 through the crease line r, and the side plates 6 and 6 'and the side plates 7 and 7' are respectively placed in the box. A box 10 is obtained by stacking and pasting together in the state of being taken in.
[0020]
When the box 10 is opened, as shown in FIG. 2, the sub lid plate 5 is raised from the main lid plate 4 through a crease line r extending over the entire length in the lateral direction. At this time, the opening piece 8 bonded to the sub-cover plate 5 is cut out from the main cover plate 4 via the perforation a and stands together with the sub-cover plate 5, so that the upper surface of the box 10 is opened.
[0021]
Of the perforation a around the open piece 8, the portion located on the rear plate 5 side is formed along the same crease line r that erects the sub lid plate 5. The perforation a and the crease line r are not required to be completely on the same line, and may be in a state where the positions are slightly shifted back and forth.
[0022]
In addition, a fixing piece 11 is formed to project forward from the crease line r by a cut line b in front of the lateral crease line r of the sub lid plate 5, and the fixing piece 11 is formed at the rear edge of the opening piece 8. A locking piece 12 extending rearward corresponding to is formed so as to protrude from the perforation a.
[0023]
As shown in FIG. 3, when the sub cover plate 5 is erected in the direction of the arrow, the leading edge of the fixing piece 11 of the sub cover plate 5 contacts the upper surface of the locking piece 12 of the open piece 8 that is turned upside down. In contact therewith, the sub lid plate 5 is maintained in an upright state. In this way, the fixing piece 11 and the locking piece 12 come into contact with each other while being appropriately elastically bent, so that the opening and closing of the sub cover plate 5 is smooth. Further, as shown in the drawing, the front end edge of the fixing piece 11 abuts on the upper surface of the locking piece 12 in a substantially horizontal state to maintain the sub lid plate 5 in an open state, so that the fixing piece 11 is locked. The degree of bending that is pushed down by the piece 12 is small.
[0024]
When closing the sub cover plate 5 of the box 10, the sub cover plate 5 in the standing state shown in FIG. 2 is lowered on the main cover plate 4 as shown in FIG. At this time, a cut line c is provided in the vicinity of the front end edge of the open piece 8 of the sub cover plate 5, and the insertion piece 13 is formed to protrude forward from the front end edge of the open piece 8 by the cut c. The auxiliary cover plate 5 is locked to the main cover plate 4 by inserting the insertion piece 13 from the perforation a of the front edge of the main cover plate 4 toward the lower side of the main cover plate 4. If it does in this way, the sub lid 5 once opened can be closed again and fixed in that state. When the function of the insertion piece 13 is not required, the insertion piece 13 and the cut line c can be omitted.
[0025]
In this embodiment, the fixed piece 11 and the locking piece 12 are provided in the middle between the left and right side plates 6, 7. However, the present invention is not limited to this embodiment, and as shown in FIGS. 5 and 6, A plurality of configurations may be employed. Moreover, the installation position is not limited to the middle in the left-right direction, and may be provided at both ends in the left-right direction near the left and right side plates 6, 7.
[0026]
In addition, left and right side plates 6 ′ and 7 ′ are provided on both side edges of the bottom plate 1, and left and right side plates 6 and 7 are provided on both end edges of the main lid plate 4, but the side plates are provided on either the bottom plate 1 or the main lid plate 4. It is good also as a structure.
[0027]
As another embodiment, as shown in FIGS. 7 and 8, the fixing piece 11 is not the sub lid plate 5 but the main lid plate 4, and the locking piece 12 is not the open piece 8 but the sub lid plate 5. It is possible to adopt a configuration provided in the above.
[0028]
As shown in FIG. 7, the locking piece 12 is provided on the sub lid plate 5 by a cut line d and is formed to extend rearward from the lateral fold line r of the sub lid plate 5, and The piece 11 is provided on the main lid plate 4 by the perforation a, and when the open piece 8 is cut off, the fixing piece 11 corresponds to the locking piece 12 in the lateral direction of the sub lid plate 5. It is formed to extend forward from the crease line r.
[0029]
As shown in FIG. 8A, when the sub lid plate 5 is rotated in the direction of the arrow, the sub lid plate 5 stands while pushing down the fixing piece 11 of the main lid plate 4. As shown in FIG. 8B, when the sub lid plate 5 is completely opened, the fixing piece 11 returns to the horizontal state, and the leading edge thereof comes into contact with the upper surface of the locking piece 12 of the sub lid plate 5. The upright state of the sub lid plate 5 is maintained. Next, when the sub lid plate 5 is closed, as shown in FIG. 8C, the sub lid plate 5 rotates in the direction of the arrow, and the locking piece 12 is inserted below the fixed piece 11. It becomes a state. For this reason, since the box 10 once opened and the unopened box 10 have different vertical positional relationships between the fixed piece 11 and the locking piece 12, it is easy to distinguish the presence or absence of opening at a glance.
[0030]
Further, as shown in FIG. 8 (c), the fixed piece 11 is pushed upward by the locking piece 12, so that the fixed piece 11 and the main lid plate 4 are hardly distorted. As shown in FIG. 8A, the sub lid plate 5 can be opened lightly and smoothly without pushing down the fixed piece 11.
[0031]
【The invention's effect】
Since the present invention is configured as described above, the opening and closing of the cover plate is lightened, and the function of maintaining the cover plate in an open state is maintained even when the opening and closing operation is repeated.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an assembled state of an embodiment. FIG. 2 is a perspective view showing an opened state of the embodiment. FIG. 3 is an enlarged sectional view of a main part of FIG. FIG. 5 is a perspective view showing an open state of another embodiment. FIG. 6 is a development view of FIG. 5. FIG. 7 is an enlarged view of a main part of another embodiment. FIG. 9 is a perspective view of a conventional example. FIG. 10 is a development view of FIG.
1, 21 Bottom plate 2, 22 Front side plate 3, 23 Rear side plate 4, 24 Main lid plate 5, 25 Sub lid plate 6, 6 ', 26, 26' Left side plate 7, 7 ', 27, 27' Right side plate 8, 28 Open pieces 9 and 29 Tongue pieces 10 and 20 Paper box 11 Fixed pieces 12 and 32 Lock pieces 13 and 33 Insert pieces 24 Cover plate 30 Front wall

Claims

The front and rear side plates 2 and 3 are connected to the front and rear ends of the bottom plate 1 by connecting the front and rear side plates 2 and 3, respectively, and the main lid plate 4 or the sub lid plate are connected to the upper edges of the side plates 2 and 3 via the crease line r. 5, and left and right side plates 6, 7, 6 ′, 7 ′ are connected to both side edges of the bottom plate 1 or both side edges of the main lid plate 4 via a crease line r. A crease line r is formed over the entire length in the lateral direction near the rear edge and can be undulated through the crease line r, and the main cover plate 4 is formed with an open piece 8 surrounded by a perforation a. Consisting of a single blank,
Each side plate is raised with respect to the bottom plate 1 via a crease line r, and the main lid plate 4 is bent inward with respect to the front plate 2 via the crease line r. 5 is folded inward via the crease line r, is superimposed on the upper surface of the main lid plate 4 and is bonded to the open piece 8;
When the sub lid plate 5 is erected through the crease line r extending over the entire length in the lateral direction, the opening piece 8 bonded to the sub lid plate 5 is cut off from the main lid plate 4 through the perforation a and released. In a paper box
A part of the perforation a around the open piece 8 is formed along the same crease line r in the lateral direction of the sub lid plate 5;
A fixing piece 11 is formed by a cut b in front of the lateral fold line r of the sub lid plate 5, and a locking piece 12 extending rearward corresponding to the fixing piece 11 is formed at the rear edge of the opening piece 8. Is formed,
When the sub lid plate 5 is erected, the tip edge of the fixing piece 11 of the sub lid plate 5 abuts on the upper surface of the locking piece 12 of the open piece 8 to maintain the sub lid plate 5 in the standing state. Paper box characterized by.

2. The paper box according to claim 1, wherein the locking piece 12 is provided with a cut d in the sub lid plate 5 in place of the open piece 8, and is rearward from the lateral fold line r of the sub lid plate 5. The fixing piece 11 is provided on the main lid plate 4 by the perforation a instead of the sub lid plate 5, and the fixing piece 11 of the sub lid plate 5 corresponds to the locking piece 12. A paper box formed so as to extend forward from the crease line r in the horizontal direction.