JP3919326B2

JP3919326B2 - Folding parallel ruler device

Info

Publication number: JP3919326B2
Application number: JP07844498A
Authority: JP
Inventors: 忠義岩井; 康男三橋
Original assignee: Mutoh Industries Ltd
Current assignee: Mutoh Industries Ltd
Priority date: 1998-03-11
Filing date: 1998-03-11
Publication date: 2007-05-23
Anticipated expiration: 2018-03-11
Also published as: JPH11254887A

Description

【０００１】
【発明の属する技術分野】
本発明は折りたたみが可能な平行定規装置に関する。
【０００２】
【従来の技術】
水平レール等を図板裏面側に退避させることができ、且つ不用意に動くことのないように簡易固定できるようにした平行定規が特開平８-３１０１９８号公報等に開示されている。
また、全体をコンパクトに折りたたむことができるようにした製図台が特公昭５０−８６７１号公報及び実公平５−１７９３９号公報等に開示されている。
【０００３】
【発明が解決しようとする課題】
通常、平行定規は、机の天板の上に載置して使用する。また、製図台に平行定規の図板を固定して使用している。机の上に平行定規を載置して作図作業を行う場合、机が部屋の中で大きな占有面積を占めてしまう。
また、折りたたみ式製図台は、図板を固定するための支持枠が、脚部材とは別個に設けられている。そのため、折りたたみ時、脚部材と支持枠が重なってしまい厚さ方向の幅が大きくなってしまうという問題点があった。
本発明は、平行定規としてはもちろん、模型造りの作業机としても使え、厚さ方向の折りたたみスペースをきわめてコンパクトにできる平行定規装置を提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記目的を達成するため、本発明は、製図板（２）と、該製図板（２）の両側に固設された一対の縦レール（４）と、該縦レール（４）に移動自在に取り付けられた縦カーソル（６）と、前記縦カーソル（６）に揺動自在に軸（１８）支された側板（１６）と、該側板（１６）に両端が架設され前記製図板（２）の表面側から裏面側に１８０度反転移動可能なグリップ用のスケールホルダ（１４）と、前記スケールホルダ（１４）に取り付けられたスケール（１２）と、前記スケール（１２）を製図板（２）の裏面位置で脱着可能に固定するためのスケール保持手段（２２）と、製図板（２）の横幅と略同長の把手用直線部（２８ａ）と一対の垂直直線部（２８ｂ）とが略コ字状に屈折形成され前記把手用直線部（２８ａ）が前記製図板（２）の後縁部（２ｂ）に近い該製図板（２）の裏面に前記後縁部（２ｂ）に対して平行な軸線を中心として回転自在に且つ該裏面との間に指の入る隙間を存して取り付けられた細長棒状部材から成る後方脚部材（２８）と、前記後方脚部材（２８）の一対の垂直直線部（２８ｂ）のうちの一方の垂直直線部（２８ｂ）に前記後方脚部材（２８）に対して略ゼロ度と少なくとも９０度の範囲で開閉自在に枢支され図板支持用水平直線部（３２ａ）と一対の垂直直線部（３２ｂ）が略コ字状に屈折形状された細長棒状部材から成る左側方脚部材（３２）と、前記後方脚部材（２８）の一対の垂直直線部（２８ｂ）のうちの他方の垂直直線部（２８ｂ）に前記後方脚部材（２８）に対して略ゼロ度と少なくとも９０度の範囲で開閉自在に枢支され図板支持用水平直部（３４ａ）と一対の垂直直線部（３４ｂ）が略コ字状に屈折形成された細長棒状部材から成る右側方脚部材（３４）とを備え、前記左右側方脚部材（３２）（３４）を閉じた時これらが互いに重ならないように、これらの図板支持用水平直線部（３２ａ）（３４ａ）のそれぞれの長さを、前記把手用直線部（２８ａ）の長さの１／２以下とし、且つ、前記後方脚部材（２８）及び左右側方脚部材（３２）（３４）の開放端の近傍に細長棒状の補強直線部（２８ｃ）（３２ｃ）（３４ｃ）を架設し、且つ、前記製図板（２）の裏面側と左右側方脚部材（３２）（３４）の図板支持用水平直線部（３２ａ）（３４ａ）との間に、角度フック（２４）と凸部（３８）とから成る製図板角度調整機構を設けたものである。
【０００５】
【発明の実施の形態】
以下に本発明の実施の形態を、添付した図面を参照して詳細に説明する。
（２）は平行定規の製図板であり、これの両側に縦レール（４）（４）が互いに平行に固設されている。前記縦レール（４）（４）にはそれぞれ縦カーソル（６）（６）が、コロ（図示省略）を介して移動自在に取り付けられている。前記縦カーソル（６）（６）は縦レール（４）（４）の両端のベルトプーリ(図示省略)に掛けられた無端状のタイミングベルト（図示省略）に連結し、左右のベルトプーリを連結する連結シャフト(図示省略)によって、互いに同期して、縦レール（４）（４）に沿って移動するように構成されている。
【０００６】
前記縦カーソル（６）（６）には、それぞれ図５に示すようにアーム(８)の一方が所定範囲で回転自在に軸（１０）支されている。アーム（８）の他方にはスケール（１２）が接着されたグリップ用スケールホルダ（１４）の両端の側板（１６）が製図板（２）の側面に対して平行な平面内で回転自在に軸(１８)支されている。
前記スケールホルダ（１４）を手で持って持ち上げると、側板（１６）は、軸(１８)を中心として回動し、この回動によってスーケル（１２）を製図板（２）面から離れる方向に上昇させることができる。スケール（１２）を製図板（２）上に下ろすと、スケール（１２）は、製図板（２）面に水平に当接する。縦カーソル（６）（６）を図５に示すように、縦レール（４）（４）に沿って、それらの手前側の端部に、縦レール（４）（４）の端部キャップのストッパー面に当接するまで移動すると、スケール（１２）を、図５、６に示すように、軸（１８）を中心として製図板（２）の手前側の前縁部（２ａ）に固定された鉛筆受け（２０）を超えて、製図板（２）の裏側まで、反転させることができるように構成されている。
【０００７】
前記鉛筆受け（２０）は、断面Ｕ字状の収納部を有し下面にスケール保持手段(２２)が固定されている。前記スケール（１２）を、製図板（２）の裏側に反転させたとき、図６及び図７に示すように、スケール（１２）を前記スケール保持手段（２２）に挿入することによって、スケール（１２）を製図板（２）の裏側にこれに対して水平に近接又は密着した状態で脱着自在に固定することができる。
（２４）（２４）は角度フックであり、製図板（２）の手前側の裏面の両側に揺動自在に軸（２６）支されている。（２８）は金属パイプなどの細長棒状部材から成る後方脚部材であり製図板（２）の横幅と略同長の把手用直線部（２８ａ）と、該直線部（２８ａ）とコ字状を形成し、該直線部に対して直角に屈折された互いに同一長さの一対の垂直直線部（２８ｂ）（２８ｂ）と、垂直直線部（２８ｂ）（２８ｂ）の開放端の近傍に架設された補強直線部（２８ｃ）とから構成されている。
【０００８】
前記後方脚部材（２８）の把手用直線部（２８ａ）は、製図板（２）の裏面に、その後縁部（２８ｂ）に対して所定間隔を在して水平に配置され、該水平状態において両端の近傍部分が、製図板（２）の裏面に固定された軸支部材（３０）（３０）によって製図板（２）裏面との間に指が入る程度の間隔を在して回転自在に取り付けられている。
（３２）（３４）は、金属パイプから成る一対の側方脚部材であり、それぞれ図板支持用水平直線部（３２ａ）（３４ａ）と、これに対してコ字状となるように直角に屈曲された垂直直線部（３２ｂ）（３２ｂ）（３４ｂ）（３４ｂ）と、垂直直線部（３２ｂ）（３２ｂ）間及び（３４ｂ）（３４ｂ）間に架設された補強直線部（３２ｃ）（３４ｃ）とから構成されている。
【０００９】
左側の側方脚部材（３２）の一対の垂直直線部（３２ｃ）（３２ｃ）は、一方が他方よりも若干短く設定され、右側の側方脚部材（３４）も同様に、一対の垂直直線部（３４ｃ）（３４ｃ）は、一方が他方よりも若干短く設定されている。前記側方脚部材（３２）（３４）は、それぞれ、短い方の垂直直線部（３２ｃ）（３４ｃ）が、後方脚部材（２８）の垂直直線部（２８ｂ）（２８ｂ）にヒンジ（３６）を介して、垂直直線部（２８ｂ）（２８ｂ）に平行な軸線を中心として回動自在に取り付けられている。前記側方脚部材（３２）（３４）の図板支持用水平直線部（３２ａ）（３４ａ）には、角度フック（２４）（２４）を係止するための凸部（３８）が固定されている。
【００１０】
次に、本装置の組み立て及び折りたたみ操作について説明する。
図１は本装置を折りたたんだ状態を示し、図３は、本装置を組み立てた状態を示している。
図１のように折りたたんだ状態においてスケール（１２）は、製図板（２）の前方の裏側に固定されている。また、左右の側方脚部材（３２）（３４）は、後方脚部材（２８）に対して角度ゼロの状態となるように、後方脚部材（２８）の内側に互いに閉じる方向に回動され、且つ、後方脚部材（２８）は、製図板（２）に対して角度ゼロとなるように回動され、製図板（２）、後方脚部材（２８）、及び左右側方脚部材（３２）（３４）は、略同一平面上に折りたたまれている。該状態において、後方脚部材（２８）の把手用直線部（２ｂ）は、図１に示すように製図板（２）の裏面の、その後部縁（２ｂ）の近傍に、これに対して水平に位置している。
【００１１】
従って平行定規装置を使用しないときは、全体を図１の如く折りたたみ、製図板（２）の後部縁（２ｂ）を上にして把手用直線部（２８ａ）を手で持ち、部屋の任意の位置に運んでその位置に片付けておくことができる。該状態において、装置全体の面積は、製図板（２）の大きさと略同一であり、且つ脚部材（２８）（３２）（３４）が製図板（２）の厚み方向に互いに重なることがなく製図板（２）に密着している。従って、製図板（２）の厚み方向に脚部材（２８）（３２）（３４）が突出することがなく、しかも、スケール（１２）が製図板（２）の表面に突出せず全体がきわめて薄く且つコンパクトに折りたたまれる。
平行定規装置を使用する場合には、まず、図２に示すように、製図板（２）を持ちながら、後方脚部材（２８）を床面に対して垂直に立て、左右の側方脚部材（３２）（３４）を、後方脚部材（２８）に対してほぼ直角の回動限界位置になるまで手前に開く。
【００１２】
次に、製図板（２）の裏側にある角度フック（２４）の複数の係合凹部（４０）のうちの一つを図４に示すように、側方脚部材（３２）（３４）の凸部（３８）に嵌合セットし、製図板（２）の傾斜角を３段階の角度のうちの好みの角度に設定する。次に、図３に示すようにスケール（１２）をスケール保持手段（２２）から外し、製図板（２）の裏面から表面に反転移動させ、装置の組み立てが完了する。
装置の全体を折りたたむ場合は、上記組み立て作業と逆の作業を行うことにより、図１に示す如く折りたたむことができる。
【００１３】
【発明の効果】
本発明は上述の如く構成したので、全体をきわめて薄くコンパクトに折りたたむことができ、しかも持ち運びにきわめて便利であるという効果が存する。
【図面の簡単な説明】
【図１】平行定規装置を折りたたんだ状態の外観図である。
【図２】平行定規装置の組み立て状態を示す外観図である。
【図３】平行定規装置の組み立てた状態を示す外観図である。
【図４】平行定規装置の一部の側面図である。
【図５】スケールを反転させた状態の外観図である。
【図６】スケール反転固定動作を示す側面図である。
【図７】平行定規装置の一部の外観図である。
【図８】平行定規装置の一部の外観図である。
【符号の説明】
２製図板
２ａ前縁部
２ｂ後縁部
４縦レール
６縦カーソル
８アーム
１０軸
１２スケール
１４スケールホルダー
１６側板
１８軸
２０鉛筆受け
２２スケール保持手段
２４角度フック
２６軸
２８後方脚部材
２８ａ把手用直線部
２８ｂ垂直直線部
２８ｃ補強直線部
３０軸支部材
３２左側方脚部材
３４右側方脚部材
３２ａ右側方脚部材
３４ａ図板支持用水平直線部
３２ｂ垂直直線部
３４ｂ垂直直線部
３２ｃ補強直線部
３４ｃ補強直線部
３６ヒンジ
３８凸部
４０係合凹部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a collapsible parallel ruler device.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 8-310198 discloses a parallel ruler in which a horizontal rail or the like can be retracted to the back side of the drawing plate and can be simply fixed so as not to move carelessly.
Further, a drafting table that can be folded in a compact manner is disclosed in Japanese Patent Publication No. 50-8671, Japanese Utility Model Publication No. 5-17939, and the like.
[0003]
[Problems to be solved by the invention]
Usually, a parallel ruler is used by placing it on a table top. In addition, a parallel ruler board is fixed to the drafting table. When drawing with a parallel ruler placed on a desk, the desk occupies a large occupied area in the room.
In the folding drafting table, a support frame for fixing the drawing board is provided separately from the leg member. For this reason, there is a problem in that the leg member and the support frame overlap each other at the time of folding, and the width in the thickness direction becomes large.
It is an object of the present invention to provide a parallel ruler device that can be used not only as a parallel ruler but also as a model work desk and capable of making the folding space in the thickness direction extremely compact.
[0004]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a drawing board (2), a pair of vertical rails (4) fixed on both sides of the drawing board (2), and the vertical rail (4). The attached vertical cursor (6), the side plate (16) supported on the vertical cursor (6) in a swingable manner (18), and both ends of the side plate (16) are installed on the drawing board (2). A scale holder (14) for grip that can be reversed 180 degrees from the front surface side to the back surface side, a scale (12) attached to the scale holder (14), and the scale (12) on the drawing board (2) The scale holding means (22) for removably fixing at the rear surface position of the plate, the handle straight part (28a) and the pair of vertical straight parts (28b) having approximately the same length as the horizontal width of the drawing board (2) are substantially provided. The handle straight portion (28a) is refracted in a U-shape and the drawing board (2 There is a gap on the back surface of the drawing board (2) near the rear edge portion (2b) that allows the finger to enter between the rear surface and the rear edge portion (2b) so as to be rotatable about an axis parallel to the rear edge portion (2b). The rear leg member (28) composed of an elongated rod-like member attached to the rear leg member (28b) and the vertical leg portion (28b) of the pair of vertical straight portions (28b). (28) is pivotally supported so as to be openable and closable within a range of substantially zero degrees and at least 90 degrees, and the horizontal straight line portion for supporting the board (32a) and the pair of vertical straight line portions (32b) are refracted into a substantially U-shape. The left leg member (32) made of an elongated rod-like member and the rear leg member (28) on the other vertical straight section (28b) of the pair of vertical straight sections (28b) of the rear leg member (28). Is pivotally supported so that it can be opened and closed within a range of approximately zero degrees and at least 90 degrees A holding horizontal straight portion (34a) and a pair of vertical straight portions (34b) and a right side leg member (34) formed of an elongated rod-like member formed by being bent in a substantially U-shape; 32) The horizontal straight line portions (32a) and (34a) for supporting the drawing boards are set to the lengths of the straight line portions (28a) for the grips so that they do not overlap each other when they are closed. Of the rear leg member (28) and the left and right side leg members (32) and (34), and the reinforcing linear portions (28c), (32c) and (34c) in the form of elongated bars in the vicinity of the open ends. An angle hook (24) is installed between the rear side of the drafting board (2) and the horizontal straight portions (32a) (34a) for supporting the board of the left and right side leg members (32) (34). And a drawing board angle adjusting mechanism including a convex portion (38).
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
(2) is a drawing board of a parallel ruler, and vertical rails (4) and (4) are fixed in parallel to each other on both sides thereof. Vertical cursors (6) and (6) are movably attached to the vertical rails (4) and (4) via rollers (not shown), respectively. The vertical cursors (6) and (6) are connected to endless timing belts (not shown) hung on belt pulleys (not shown) at both ends of the vertical rails (4) and (4), and the left and right belt pulleys are connected. The connecting shaft (not shown) is configured to move along the vertical rails (4) and (4) in synchronization with each other.
[0006]
As shown in FIG. 5, one of the arms (8) is supported on the vertical cursors (6) and (6) by a shaft (10) so as to be rotatable within a predetermined range. On the other side of the arm (8), the side plates (16) at both ends of the grip scale holder (14) to which the scale (12) is bonded are pivoted in a plane parallel to the side surface of the drawing board (2). (18) Supported.
When the scale holder (14) is lifted by hand, the side plate (16) rotates about the shaft (18), and the rotation causes the sockel (12) to move away from the drawing plate (2) surface. Can be raised. When the scale (12) is lowered onto the drawing board (2), the scale (12) comes into horizontal contact with the surface of the drawing board (2). As shown in FIG. 5, the vertical cursors (6) and (6) are arranged along the vertical rails (4) and (4) at the end portions on the near side of the end caps of the vertical rails (4) and (4). When moved to contact with the stopper surface, the scale (12) was fixed to the front edge (2a) on the near side of the drawing board (2) with the axis (18) as the center, as shown in FIGS. It is comprised so that it can be reversed beyond a pencil receptacle (20) to the back side of a drawing board (2).
[0007]
The pencil holder (20) has a U-shaped storage section, and a scale holding means (22) is fixed to the lower surface. When the scale (12) is reversed to the back side of the drawing board (2), the scale (12) is inserted into the scale holding means (22) as shown in FIGS. 12) can be detachably fixed to the back side of the drawing board (2) in a state of being close to or in close contact with the drawing board horizontally.
(24) and (24) are angle hooks, which are pivotally supported (26) on both sides of the rear side of the front side of the drawing board (2). (28) is a rear leg member made of an elongated rod-like member such as a metal pipe, and has a handle straight portion (28a) substantially the same as the width of the drawing board (2), and a U-shape with the straight portion (28a). A pair of vertical straight portions (28b) and (28b) having the same length and refracted at right angles to the straight portions and the open ends of the vertical straight portions (28b) and (28b) It is comprised from the reinforcement linear part (28c).
[0008]
The straight portion (28a) for the handle of the rear leg member (28) is horizontally disposed on the back surface of the drawing board (2) at a predetermined interval with respect to the rear edge portion (28b). The vicinity of both ends can be freely rotated by a shaft support member (30) (30) fixed to the back surface of the drafting board (2) with a space that allows a finger to enter between the back surface of the drafting board (2). It is attached.
(32) and (34) are a pair of side leg members made of metal pipes, which are respectively perpendicular to the horizontal straight lines (32a) and (34a) for supporting the drawing board so as to be U-shaped. Reinforced straight line portions (32c) (34c) constructed between the bent vertical straight line portions (32b) (32b) (34b) (34b) and the vertical straight line portions (32b) (32b) and (34b) (34b). ).
[0009]
One of the pair of vertical straight portions (32c) (32c) of the left side leg member (32) is set slightly shorter than the other, and the right side leg member (34) is similarly paired with a pair of vertical straight lines. One of the portions (34c) and (34c) is set slightly shorter than the other. Each of the side leg members (32) and (34) has a shorter vertical straight line portion (32c) (34c) and a hinge (36) to the vertical straight line portion (28b) (28b) of the rear leg member (28). And is attached so as to be rotatable about an axis parallel to the vertical straight portions (28b) and (28b). A convex portion (38) for locking the angle hooks (24) (24) is fixed to the horizontal straight portions (32a) (34a) for supporting the drawing plate of the side leg members (32) (34). ing.
[0010]
Next, the assembly and folding operations of the apparatus will be described.
FIG. 1 shows a state where the apparatus is folded, and FIG. 3 shows a state where the apparatus is assembled.
In the folded state as shown in FIG. 1, the scale (12) is fixed to the back side in front of the drawing board (2). Further, the left and right side leg members (32), (34) are rotated in a direction to close each other inside the rear leg member (28) so that the angle is zero with respect to the rear leg member (28). The rear leg member (28) is rotated so that the angle is zero with respect to the drawing board (2), and the drawing board (2), the rear leg member (28), and the left and right side leg members (32). ) (34) is folded on substantially the same plane. In this state, the straight portion for grip (2b) of the rear leg member (28) is positioned in the vicinity of the rear edge (2b) on the back surface of the drawing board (2) as shown in FIG. Is located.
[0011]
Therefore, when the parallel ruler device is not used, the whole is folded as shown in FIG. 1, the rear edge (2b) of the drawing board (2) is held up, and the handle straight part (28a) is held by hand. Can be carried away and put in place. In this state, the area of the entire apparatus is substantially the same as the size of the drawing board (2), and the leg members (28), (32), and (34) do not overlap each other in the thickness direction of the drawing board (2). It is in close contact with the drawing board (2). Accordingly, the leg members (28), (32), and (34) do not protrude in the thickness direction of the drawing board (2), and the scale (12) does not protrude on the surface of the drawing board (2), and the whole is extremely Folds thin and compact.
When the parallel ruler device is used, first, as shown in FIG. 2, while holding the drawing board (2), the rear leg member (28) is set up vertically with respect to the floor surface, and left and right side leg members. (32) Open (34) forward until it reaches a rotation limit position substantially perpendicular to the rear leg member (28).
[0012]
Next, as shown in FIG. 4, one of the plurality of engaging recesses (40) of the angle hook (24) on the back side of the drawing board (2) is formed on the side leg members (32) (34). The projection (38) is fitted and set, and the inclination angle of the drawing board (2) is set to a desired angle among the three levels. Next, as shown in FIG. 3, the scale (12) is removed from the scale holding means (22), and is reversely moved from the back surface to the front surface of the drawing board (2), thereby completing the assembly of the apparatus.
When the entire apparatus is folded, it can be folded as shown in FIG. 1 by performing the reverse of the above assembling work.
[0013]
【The invention's effect】
Since the present invention is configured as described above, there is an effect that the whole can be folded in a very thin and compact manner and is very convenient to carry.
[Brief description of the drawings]
FIG. 1 is an external view of a state in which a parallel ruler device is folded.
FIG. 2 is an external view showing an assembled state of the parallel ruler device.
FIG. 3 is an external view showing the assembled state of the parallel ruler device.
FIG. 4 is a side view of a part of the parallel ruler device.
FIG. 5 is an external view of a state in which a scale is inverted.
FIG. 6 is a side view showing a scale reversal fixing operation.
FIG. 7 is an external view of a part of the parallel ruler device.
FIG. 8 is an external view of a part of the parallel ruler device.
[Explanation of symbols]
2 Drawing board 2a Front edge portion 2b Rear edge portion 4 Vertical rail 6 Vertical cursor 8 Arm 10 Axis 12 Scale 14 Scale holder 16 Side plate 18 Axis 20 Pencil holder 22 Scale holding means 24 Angle hook 26 Axis 28 Rear leg member 28a Straight line for handle Part 28b Vertical straight part 28c Reinforcement straight part 30 Axial support member 32 Left side leg member 34 Right side leg member 32a Right side leg member 34a Horizontal straight part 32b for supporting the board Vertical straight part 34b Vertical straight part 32c Reinforcement straight part 34c Reinforcement Linear part 36 Hinge 38 Protruding part 40 Engaging concave part

Claims

A drawing board (2), a pair of vertical rails (4) fixed on both sides of the drawing board (2), a vertical cursor (6) movably attached to the vertical rail (4), A side plate (16) supported by a vertical cursor (6) in a swingable manner with a shaft (18), and both ends of the side plate (16) are erected 180 degrees from the front side to the back side of the drawing board (2). A scale holder (14) for possible grips, a scale (12) attached to the scale holder (14), and the scale (12) for removably fixing the back surface of the drawing board (2). A scale holding means (22), a straight part for a handle (28a) and a pair of vertical straight parts (28b) having the same length as the horizontal width of the drawing board (2) are refracted into a substantially U shape, and the straight line for the handle. The drawing board (28a) is close to the rear edge (2b) of the drawing board (2) ( ) A rear leg member made of an elongated rod-like member attached to the back surface of the rear edge portion (2b) so as to be rotatable about an axis parallel to the rear edge portion (2b) and with a gap for inserting a finger between the back surface ( 28) and one vertical straight portion (28b) of the pair of vertical straight portions (28b) of the rear leg member (28) at approximately zero degrees and at least 90 degrees with respect to the rear leg member (28). A left-side leg member (32) comprising an elongated rod-like member pivotally supported so as to be openable and closable in a range and having a pair of vertical straight line portions (32a) and a pair of vertical straight line portions (32b) bent in a substantially U-shape. The other vertical straight portion (28b) of the pair of vertical straight portions (28b) of the rear leg member (28) opens and closes with respect to the rear leg member (28) within a range of approximately zero degrees and at least 90 degrees. A horizontal straight part (34a) for supporting the drawing board and a pair of hanging parts. A straight leg portion (34b) having a right side leg member (34) made of an elongated rod-like member refracted in a substantially U shape, and when the left and right side leg members (32) (34) are closed, they are mutually A foldable parallel ruler device characterized in that it does not overlap.

The length of each of the horizontal linear portions (32a) and (34a) for supporting the drawing board is set to be ½ or less of the length of the linear portion for grips (28a). The folding parallel ruler device as described.

In the vicinity of the open ends of the rear leg member (28) and the left and right side leg members (32), (34), reinforcing rod-shaped reinforcing straight portions (28c) (32c) (34c) are erected. The foldable parallel ruler device according to item 1.

Between the back side of the drawing board (2) and the horizontal straight portions (32a) (34a) for supporting the drawing board of the left and right side leg members (32) (34), an angle hook (24) and a convex part (38 The folding parallel ruler device according to claim 1, further comprising a drafting plate angle adjusting mechanism.