JP4933070B2 - Simple folding frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple folding type frame structure convenient to store and carry because of being compactly foldable in both width and height directions, and easily installed even in a place where a fixing pile or the like cannot be driven. <P>SOLUTION: The simple folding type frame structure 1 formed by connecting an upper frame 2 and a lower frame 3 constituting the skeleton of a temporary box, rotatably to a connecting member 4, is constituted to erect a skeleton structure with the upper frame 2 and lower frame 3 vertically extended in a developed state and to fold the upper frame 2 and lower frame 3 on either one side of the upper and lower sides of the connecting member 4 in a folded state. The frame structure 1 has an acute angle fixing means 5 for fixing one of the upper frame 2 and lower frame 3 in a position rotated to a predetermined acute angle from the folded position, and an obtuse angle fixing means 6 for fixing the other in a position rotated to a predetermined obtuse angle from the folded position when developed from the folded state. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a frame structure of a temporary box used for a foldable temporary toilet, a temporary changing room, and the like, and in particular, it can be folded compactly and installed even in a place where a fixing pile cannot be driven. The present invention relates to a simple folding frame structure.

  Conventionally, a foldable temporary box has been proposed. This temporary box is generally configured such that a foldable frame is three-dimensionally assembled and fixed with bolts or screws to form a frame, and this frame is covered with a three-dimensional cover or the like. And, the piles etc. are driven into the lower end of the framework and installed directly on the ground, or the fixing rope attached to the temporary box is stretched and the end is driven into the ground to install on the ground. Yes.

  As a temporary box provided with such a frame structure, for example, a foldable simple assembly outdoor installation box described in Japanese Utility Model Publication No. 53-34123 is known (Patent Document 1). This foldable simple assembly outdoor installation box has a pair of portal frames in which an upper frame member and a lower frame member are configured to be extendable, and these portal frames are arranged on the side configured in an X shape. They are connected by a partial connection frame. Accordingly, by pulling the portal frames closer to each other, the side connection frame is folded and the upper frame member extends upward, so that the skeleton is folded.

Japanese Utility Model Publication No. 53-34123

  However, in the conventional folding frame structure including the invention described in Patent Document 1, even if it is folded, it becomes thin in the width direction, but does not decrease in the height direction. Since it becomes high like literature 1, there is a problem that it cannot be folded compactly and is inconvenient to store and carry.

  Moreover, in the conventional folding frame structure, since there are many parts which connect each frame, it takes the effort of pinning and cannot be installed easily and rapidly.

  Furthermore, in the conventional folding frame structure, when it is fixed so as not to be blown by the wind, it is necessary to drive it into the ground with a pile or the like. There is a problem that you can not.

  The present invention has been made to solve such problems, and can be folded compactly in both the width direction and the height direction, and is convenient for storage and carrying. An object of the present invention is to provide a simple folding frame structure that can be easily installed even in places where piles or the like cannot be driven.

  The simple foldable frame structure according to the present invention is characterized by a simple foldable frame structure in which a pair of left and right upper frames and a pair of left and right lower frames constituting the framework of a temporary box are rotatably connected to a connecting member. In the unfolded state, the left and right upper frames extend in the left and right direction so that the cover can be extended, and the left and right lower frames extend in the left and right direction on the lower side. In the folded state, the left and right upper frames and the lower frame are rotated in the same direction on the left and right to either the upper or lower side of the connecting member. One of the upper frame and the lower frame when deployed from the folded state. There is an acute angle fixing means for fixing at a position rotated from the folding position to a predetermined acute angle, and an obtuse angle fixing means for fixing the other frame at a position rotated from the folding position to a predetermined obtuse angle. In the point.

  In the present invention, at least one of the upper frame and the lower frame is divided at a predetermined position in the height direction, and the divided front-end divided frames are rotatably connected and folded. In this state, the distal-side divided frame is brought into contact with the proximal-side divided frame and overlapped. In the unfolded state, the distal-side divided frame is brought into contact at a position rotated by approximately 180 °, and the shaft of the proximal-side divided frame is It is preferable that a joint member extending on the line is provided.

  Furthermore, in the present invention, it is preferable that the frame to be divided is equally divided in the height direction, and the length of the divided frame is substantially the same as the length of the other frame that is not divided.

  Further, in the present invention, the acute angle fixing means rotatably supports the base end portion of either the upper frame or the lower frame rotated from the folding position to the obtuse angle on the connecting member, It is located outside the position of the acute rotation axis that rotatably supports the other frame that is rotated from the folding position to an acute angle, and is located closer to the other frame than the position of the acute rotation axis. It is preferable to be configured as an obtuse angle rotating shaft / stopper.

  Further, in the present invention, the obtuse angle fixing means includes an obtuse angle stopper member that determines a fixing position by contacting a frame rotated from a folding position to a predetermined obtuse angle, and a pair of left and right positions positioned by the obtuse angle stopper member. It is preferable to be comprised from the latching member which fixes a flame | frame.

  In the present invention, it is preferable that the locking member is constituted by a fixing expansion / contraction member that connects a pair of divided frames on the distal end side of the divided frames with appropriate tension.

  Furthermore, in the present invention, it is provided with a position fixing means for fixing at a predetermined installation location, and this position fixing means is formed in accordance with the interval between the pair of left and right lower frames in the unfolded state, and the lower part thereof A fixing pressing portion formed in a recessed shape in cross section that can press the grounding portion of the frame from above, and a predetermined heavy object that is extended to the outside of the lower frame to apply a pressing force to the fixing pressing portion. It is preferable to have a heavy article placement part to be placed.

  According to the present invention, it can be folded compactly in both the width direction and the height direction, is convenient for storage and carrying, and can be easily installed even in places where a fixing pile or the like cannot be driven. Can do.

  Hereinafter, a first embodiment of a simple folding frame structure 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a state in which the simple folding frame structure 1 of the first embodiment is assembled, and FIG. 2 is a side view thereof.

  As shown in FIGS. 1 and 2, the simple folding frame structure 1 of the first embodiment mainly includes a pair of left and right upper frames 2 and 2 that extend upward and a downward extension. A pair of left and right lower frames 3 and 3, a connecting member 4 for connecting the upper frames 2 and 2 and the lower frames 3 and 3, and an acute angle fixing means 5 for fixing the lower frames 3 and 3 at predetermined positions. And an obtuse angle fixing means 6 for fixing the upper frames 2 and 2 at predetermined positions, and a position fixing means 8 for fixing the installation position of the temporary box 7 having the simple folding frame structure 1 as a framework. ing.

  Hereinafter, each component will be described in more detail. The upper frames 2, 2 and the lower frames 3, 3 are made of metal pipes, resin pipes, etc., and are formed in a substantially U-shaped frame shape as shown in FIGS. 1 and 2. . In the first embodiment, each of the upper frames 2 and 2 is formed to be approximately twice as long as the length in the height direction of each of the lower frames 3 and 3, and this length is divided into two equal parts. In this position, the frame is divided into a divided frame 21 on the proximal end side and a divided frame 22 on the distal end side and is connected by a joint member 9. As shown in FIG. 3, the joint member 9 is formed in a substantially concave shape in cross section, and is formed with two pairs of shaft holes 91 facing each other. A rotating shaft 92 is inserted into opposing ends of the proximal-side divided frame 21 and the distal-side divided frame 22, and the rotating shaft 92 is supported in each shaft hole 91. As a result, the upper frames 2 and 2 can be folded with the joint member 9 as a boundary. It has become.

  In the first embodiment, the upper frame 2 is equally divided in the height direction, and the length of the divided frame 21 on the proximal end side and the divided frame 22 on the distal end side are substantially the same as the length of the lower frame 3. However, the present invention is not limited to this, and the length of each divided frame when the upper frame 2 is equally divided in the height direction is substantially the same as the length of the lower frame 3. It may be divided into two or more equal parts. However, in this case, it is necessary to provide the joint member 9 so that each divided frame bends alternately.

  In the first embodiment, the upper frame 2 is divided and bent. However, the present invention is not limited to this, and the lower frame 3 may be divided and bent by the joint member 9, and further Both frames may be configured to be bendable. That is, if at least one of the upper frame 2 and the lower frame 3 is divided at a predetermined position in the height direction and connected by the joint member 9, it can be folded more compactly in the height direction than in the unfolded state. Become. Of course, if it is not necessary to fold each frame, it is not necessary to divide and to provide the joint member 9.

  Next, the connecting member 4 is composed of a metal plate, a resin plate, or the like, and supports and connects the base end portions of the upper frames 2 and 2 and the lower frames 3 and 3 in a rotatable manner. In the first embodiment, as shown in FIG. 1, the acute angle rotation shaft 31, the obtuse angle rotation shaft 51, and the obtuse angle stopper member 61 are provided at left and right symmetrical positions. Specifically, an acute angle rotation shaft 31 that rotatably supports the base ends of the lower frames 3 and 3 is provided on the inner upper portion of the connecting member 4, and on the outer lower portion of the connecting member 4. An obtuse angle rotation shaft 51 is provided for rotatably supporting the base end portions of the upper frames 2 and 2. Further, an obtuse angle stopper member 61 that restricts the rotational movement of the lower frames 3 and 3 is provided on the inner upper side of the obtuse angle rotation shaft 51.

  The acute angle fixing means 5 fixes each of the lower frames 3 and 3 at a position rotated from the folding position to a predetermined acute angle. In the first embodiment, the obtuse angle rotation shaft 51 is connected to each of the lower frames 3 and 3. 3 is also used as a stopper that comes into contact with 3. Specifically, as shown in FIG. 1, the obtuse angle rotation shaft 51 is located outside the position of the acute angle rotation shaft 31 and on the lower frame 3 side than the position of the acute angle rotation shaft 31. ing. For this reason, when the lower frames 3 and 3 are rotated by a predetermined acute angle from the folded state, they are brought into contact with the obtuse angle rotation shafts 51 and 51 and their fixed positions are determined.

  The obtuse angle fixing means 6 fixes each of the upper frames 2 and 2 at a position rotated from the folded position to a predetermined obtuse angle. The obtuse angle stopper member 61, the base end side locking member 62, and the distal end side locking It is comprised from the member 63. FIG. As shown in FIG. 1, the obtuse angle stopper member 61 is provided in the rotational movement range of the divided frame 21 on the base end side of each of the upper frames 2 and 2, and the upper frames 2 and 2 are in a predetermined blunted state from the folded state. When rotated to an angle, the fixed position is determined by contact. Note that the obtuse angle stopper member 61 of the first embodiment is provided at a position where at least the proximal-side divided frame 21 does not rotate 180 ° or more so as to ensure a sufficient space in the temporary box.

  The base end side locking member 62 fixes the split frames 21 and 21 on the base end side of the upper frames 2 and 2 positioned by the obtuse angle stopper member 61, and one end thereof is the split frame 21 on the base end side. It is pivotally supported by one of these. Further, a hook portion 62a is provided on the other end of the base end side locking member 62, and is hooked on a fixing pin 62b provided on the other base end side split frame 21.

  The distal end side locking member 63 connects the divided frames 22 and 22 on the distal end side of the upper frames 2 and 2 extended substantially linearly by the joint member 9. In the first embodiment, the distal end side locking member 63 extends and contracts. One end of the rubber is attached to one of the divided frames 22 on the front end side, and a hook 63a provided on the other end is hooked on a fixing ring 63b provided on the other divided frame 22 on the other end side.

  The position fixing means 8 is for fixing the temporary box 7 to a predetermined installation place, and is formed of a rectangular metal flat plate. Specifically, as shown in FIGS. 1 and 4, the position fixing means 8 is extended to the outside of the lower frame 3 from a pair of fixing pressing portions 81, 81 and the fixing pressing portions 81, 81. And a heavy article mounting portion 82. Each of the fixing pressing portions 81 and 81 is provided in accordance with the distance between the pair of left and right lower frames 3 and 3 in the unfolded state, and is formed in a curved concave section shape that can press the grounding portion of the lower frame 3 from above. ing. Further, the heavy load placing portion 82 is formed in a substantially flat plate shape so that a predetermined heavy load can be placed, and when the heavy load is placed, the heavy load placing portion 82 is provided below the fixing pressing portions 81, 81. A direction pressing force is applied.

  Further, in the first embodiment, the position fixing means 8 is configured to be foldable at substantially the center in the longitudinal direction as shown in FIG. Specifically, it is divided at substantially the center in the longitudinal direction, and the divided opposing edge portions are connected by a pair of hinges 83 and 83. In addition, a pair of cylindrical members 84 and 84 are provided at substantially the center of the divided opposed edge portions so that the axes coincide with each other, and the through holes of these cylindrical members 84 and 84 can be slidably inserted. A slide fitting 85 is provided. Thus, when the slide fitting 85 is inserted through the through holes of the cylindrical members 84, 84, the position fixing means 8 is held in the developed state. In the first embodiment, a driving hole h for driving the pile into the position fixing means 8 and the lower frames 3 and 3 is formed in order to reinforce the stability when the pile is installed in a place where the pile can be driven.

  Next, the operation of the simple folding frame structure 1 in the first embodiment will be described.

  First, the case where the temporary box 7 using the simple folding frame structure 1 of the first embodiment is installed will be described. FIG. 6 is a front view showing a state in which the simple folding frame structure 1 of the first embodiment is folded, and FIG. 7 is a side view thereof.

  As shown in FIGS. 6 and 7, in the first embodiment, the lower frames 3 and 3 are folded so as to be in contact with each other, and the upper frames 2 and 2 are bent 180 ° at the joint member 9. In addition, the base-side divided frame 21 and the distal-side divided frame 22 are folded to the lower frames 3 and 3 in a state where they are overlapped in contact with each other. In the first embodiment, the left and right upper frames 2 and 2 and the lower frames 3 and 3 are rotated in the same direction on the left and right, respectively, and folded to the lower side of the connecting member 4. The configuration is not limited, and the left and right upper frames 2 and 2 and the lower frames 3 and 3 may be folded to either the upper or lower side of the connecting member 4.

  When assembling from this folded state, as shown in FIGS. 8 and 9, first, the divided frames 21, 21 on the base end side of each upper frame 2, 2 are lifted while rotating around the obtuse angle rotation shaft 51, The lower frames 3 and 3 are expanded while being rotated around the acute rotation axis 31. At this time, each of the lower frames 3 and 3 comes into contact with and stops at an obtuse angle rotating shaft 51 provided at an outer lower portion of the acute angle rotating shaft 31. And by making it ground on the mounting surface in this contact state, the lower frames 3 and 3 hold the contact state by their own weight. Thereby, each lower frame 3 and 3 is fixed in the state rotated from the folding state to the predetermined acute angle.

  Subsequently, when the divided frames 21, 21 on the base end side of the upper frames 2, 2 are further rotated around the obtuse angle rotation shaft 51, as shown in FIG. 9, they come into contact with the obtuse angle stopper member 61 and stop. Then, by hooking the hook portion 62a of the base end side locking member 62 to the fixing pin 62b, the split frames 21 and 21 on the base end side of the upper frames 2 and 2 are fixed in the contact state. Further, after fixing the divided frames 21 and 21 on the base end side and rotating the divided frames 22 and 22 on the distal end side along the joint member 9, the axis of the divided frames 21 and 21 on the base end side coincides. Then, it comes into contact with the joint member 9 and stops. Then, as shown in FIG. 1, by hooking the hook 63a of the distal end side locking member 63 to the fixing ring 63b, the divided frames 22 and 22 on the distal end side of the upper frames 2 and 2 are fixed in the contact state. The By the above, each upper frame 2 and 2 is fixed in the state rotated from the folded state to the predetermined obtuse angle.

  Further, when the position fixing means 8 of the first embodiment is used, it is unfolded by rotating around the hinges 83, 83 from the folded state shown in FIG. Then, as shown in FIG. 4, when the slide fitting 85 is slid and inserted into both cylindrical members 84, rotation around the hinges 83, 83 is prevented and the plate is fixed to a substantially flat plate shape. As shown in FIG. 1, the position fixing means 8 fixed in this manner abuts with the fixing pressing portions 81 and 81 covering the grounded portions of the lower frames 3 and 3 from above. Then, when a heavy object m such as a wheel of a passenger car is placed on the heavy article placement part 82, each fixing pressing part 81, 81 presses the ground contact portion of each lower frame 3, 3 from above, so that simple folding is possible. The type frame structure 1 is fixed at a predetermined installation location. Thereby, even if a horizontal force is applied to the simple foldable frame structure 1 due to a strong wind blowing or an unexpected impact, it will not be blown or fallen.

  By covering the simple foldable frame structure 1 assembled as described above with a cover 10 such as a waterproof sheet, the upper frames 2 and 2 extend the cover 10, and the temporary structure shown in FIGS. Box 7 is formed. In addition, the cover 10 of the first embodiment is provided with a slide fastener 11 on its side surface, and functions as an entrance when the slide fastener 11 is opened. Further, as shown in FIGS. 2 and 11, cover fixing brackets 12 and 12 for fixing the cover 10 are provided at both ends of the grounding portions of the lower frames 3 and 3, respectively. The lower end of the cover 10 is locked to the fixing brackets 12 and 12. Further, when the temporary box 7 of the first embodiment is installed at a place where the pile can be driven, as shown in FIG. 12, the pile p is driven and fixed in the driving hole h formed in the position fixing means 8. It may be.

  On the other hand, when the temporary box 7 using the simple foldable frame structure 1 according to the first embodiment is folded, the folding process shown in FIGS. It is. As a result, the size in the width direction (left-right direction in FIG. 6) is extremely compacted to about the width of the connecting member 4. Further, in the height direction (vertical direction in FIG. 6), the upper frames 2 and 2 are folded in half and rotated to the lower frames 3 and 3 side. Can be made as small as possible.

According to the first embodiment as described above,
1. Since the temporary box 7 can be compactly folded not only in the width direction but also in the height direction, it can be easily carried and stored.
2. Since the temporary box 7 can be easily fixed without using a fixing pile or the like, it can be installed even in a place where the pile cannot be driven.
3. Since it has a simple configuration, it is easy to handle, and has the effect that anyone can easily and quickly assemble it.

  Next, a second embodiment of the simple folding frame structure 1 ′ according to the present invention will be described with reference to FIGS. 13 to 17. In addition, the same code | symbol is attached | subjected about the structure equivalent to the structure of 1st Embodiment mentioned above, or it abbreviate | omits description.

  The feature of the second embodiment is that, in the first embodiment, instead of the proximal end side locking member 62 and the distal end side locking member 63, a fixing elastic member 64 made of rubber or the like is used. is there. Specifically, two string-like fixing elastic members 64 and 64 are used, and among the divided frames 21 and 22 divided vertically, a pair of divided frames 22 and 22 on the front end side are appropriately used. Attach so that it is connected with sufficient tension. The attachment portion may be fixed to a pin or the like, or may be inserted into a hole or the like and attached rotatably.

  When deploying the simple foldable frame structure 1 ′, as shown in FIG. 15 and FIG. 16, first, the divided frames 21 and 21 on the base end side are attached while resisting the tension of the fixing elastic member 64. By rotating the obtuse angle and expanding it, and further rotating the split frames 22 and 22 on the front end side by 180 °, the unfolded state is naturally maintained by the tension of the fixing expansion and contraction members 64 and 64, and it is necessary to hang them separately. Absent.

  In the case of storage, the distal-side divided frames 22 and 22 and the proximal-side divided frames 21 and 21 may be sequentially reversely rotated and overlapped against the tension of the fixing elastic members 64 and 64. .

  As described above, according to the second embodiment, in addition to the effects of the first embodiment, when the divided frames 21 and 22 are expanded, the expansion frames 64 and 64 are easily expanded using the expansion and contraction force. In addition, since the unfolded state can be maintained without being hung, work efficiency is greatly improved. Moreover, since the function which hold | maintains an unfolded state is provided, the front end side locking member 63 is not required but there also exists a merit which can reduce a structural member. Of course, the distal end side locking member 63 may also be used as necessary.

  The simple folding frame structure 1, 1 'according to the present invention is not limited to the above-described embodiments, and can be changed as appropriate.

  For example, in the present embodiment, the wheels of the passenger car are placed on the heavy article placement portion 82 of the position fixing means 8, but the present invention is not limited to this, and the temporary box 7 may be blown off by a strong wind or unexpectedly. Any heavy object can be used as long as it can be prevented from falling due to an impact.

It is a front view which shows 1st Embodiment of the simple folding type frame structure which concerns on this invention. It is a side view of FIG. It is a perspective view which shows the joint member in this 1st Embodiment. It is a top view which shows the position fixing means in the 1st embodiment. It is a front view which shows the state which the position fixing means in the 1st Embodiment folded. It is a front view which shows the folded state of the simple foldable frame structure of this 1st Embodiment. FIG. 7 is a side view of FIG. 6. It is a front view which shows the state which the lower frame in the 1st Embodiment fixed. It is a front view which shows the state which the base end side division | segmentation frame of the upper frame in the 1st Embodiment fixed. It is a front view which shows the state which assembled the temporary box using the simple folding type frame structure of this 1st Embodiment. It is a side view of FIG. It is a front view which shows the state which fixed the temporary box in this 1st Embodiment using the position fixing means and the pile. It is a front view which shows 2nd Embodiment of the simple folding type frame structure which concerns on this invention. FIG. 14 is a side view of FIG. 13. It is a front view which shows the state which began to expand | deploy the base end side division | segmentation frame of the upper frame in this 2nd Embodiment. It is a front view which shows the state which the expansion | deployment of the base end side division | segmentation frame of the upper frame in this 2nd Embodiment was completed. It is a front view which shows the state which has begun to expand | deploy the front end side division | segmentation frame of the upper frame in this 2nd Embodiment.

Explanation of symbols

1 Simple Folding Frame Structure (First Embodiment)
1 'Simple Foldable Frame Structure (Second Embodiment)
2 Upper frame 3 Lower frame 4 Connecting member 5 Acute angle fixing means 6 Obtuse angle fixing means 7 Temporary box 8 Position fixing means 9 Joint member 10 Cover 11 Slide fastener 12 Cover fixing bracket 21 Split frame 22 on the proximal end side 22 Divided frame 31 Acute angle rotation shaft 51 Obtuse angle rotation shaft 61 Obtuse angle stopper member 62 Base end side locking member 62a Hook part 62b Fixing pin 63 Front end side locking member 63a Hook 63b Fixing ring 64 Fixing elastic member 81 Fixing pressing part 82 Weight Object placement part 83 Hinge 84 Cylindrical member 85 Slide fitting 91 Shaft hole 92 Rotating shaft m Heavy object h Driving hole p Pile

Claims (6)

A simple foldable frame structure in which a pair of left and right upper frames and a pair of left and right lower frames constituting a framework of a temporary box are rotatably connected to a connecting member,
In the unfolded state, the left and right upper frames are respectively extended in the left and right directions so that the cover can be extended, and the left and right lower frames are respectively extended in the left and right directions on the lower side and The frame structure is erected by being grounded on the mounting surface,
In the folded state, the left and right upper frames and the lower frame are rotated in the same direction on the left and right, respectively, and folded to either the upper or lower side of the connecting member,
When unfolding from the folded state, an acute angle fixing means for fixing one of the upper frame and the lower frame at a position rotated from the folded position to a predetermined acute angle, and the other frame from the folded position. And having an obtuse angle fixing means for fixing at a position rotated to a predetermined obtuse angle ,
Position fixing means for fixing to a predetermined installation location is provided, and the position fixing means is formed in accordance with the interval between the pair of left and right lower frames in the unfolded state, and the grounding portion of the lower frame is located above A pressing portion for fixing formed in a concave shape in cross-section that can be pressed from the outside, and a heavy load that is extended to the outside of the lower frame and places a predetermined heavy load in order to apply a pressing force to the fixing pressing portion A simple foldable frame structure having a mounting portion .   2. The upper frame and the lower frame according to claim 1, wherein at least one of the upper frame and the lower frame is divided at a predetermined position in the height direction, and the divided front-end divided frames are rotatably connected and folded. In the state, the distal-side divided frame is brought into contact with the proximal-side divided frame and overlapped. A simple foldable frame structure characterized in that a joint member is provided to extend to the frame.   3. The simple folding according to claim 2, wherein the frame to be divided is equally divided in the height direction, and the length of the divided frame is substantially the same as the length of the other frame that is not divided. Tatami frame structure.   4. The acute angle fixing means according to claim 1, wherein the acute angle fixing means is configured to allow the base end portion of either the upper frame or the lower frame rotated from the folding position to an obtuse angle to freely rotate on the connecting member. And supporting the other frame that is rotated from the folding position to an acute angle so as to be rotatable, and is positioned outside the position of the acute angle rotation axis, and the other frame is positioned more than the position of the acute angle rotation axis. A simple foldable frame structure characterized in that it is configured as an obtuse angle rotating shaft / stopper disposed on the frame side.   5. The obtuse angle fixing means according to claim 4, wherein the obtuse angle fixing means includes an obtuse angle stopper member that contacts a frame rotated from a folding position to a predetermined obtuse angle to determine the fixed position, and a pair of left and right frames positioned by the obtuse angle stopper member. A simple foldable frame structure characterized by comprising a locking member for fixing the frame.   6. The simple folding type according to claim 5, wherein the locking member is constituted by a fixing expansion / contraction member for connecting a pair of divided frames on the distal end side of the divided frames with an appropriate tension. Frame structure.

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