JP2015003750A - Foldable container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a container to be easily folded and maintain its folded state.SOLUTION: A foldable container comprises a cylindrical body and a bottom sealing lower edge of the body. The unfolded body comprises cylindrical main body part in its entire high. The main body part has regular polygons at upper and lower edges thereof which have the same number of vertexes and the same center in plan view and a configuration in its entire length in a circumferential direction where trapezoidal pieces having upper side parallel with lower side and the same shape are repeated in side view. Each of the trapezoidal pieces having the same shape comprises two triangle foldable piece on both sides of a concave folding line as a diagonal line separating the trapezoidal region. The triangle region on each of the foldable pieces is sectioned into an upper folding piece, a middle folding piece, and a lower folding piece from upper side to lower side. A boundary of two adjacent trapezoidal pieces is a convex folding line with which they may be folded so as to be a lightning shape where the middle folding piece is placed at its center position. When it is folded, two middle folding pieces placed at both sides of the boundary overlap in a manner where a part of the boundary is to be a symmetric axis of line symmetry.

Description

  The present invention relates to a folding container including a cylindrical body and a bottom that closes a lower end of the body.

The folding container is a regular polygon that has the same number of vertices and center when viewed from the top and bottom of the container body having a bottomed cylindrical shape, and the side faces are repeated by repeating a square trapezoid piece with the same shape. What has been configured is known (Patent Document 1). In this method, a boundary line between adjacent trapezoidal pieces is a mountain fold line, a diagonal line dividing each trapezoidal piece into two triangles is a valley fold line, and a large number of triangles are folded pieces.
The container is folded by grasping the opening side and bottom side of the container body before folding with both hands and twisting the bottom side relative to the opening side while maintaining concentricity.

JP 2010-280437 A

  By the way, the folding container of Patent Document 1 described above applies a large deformation force to the triangular folding piece in the course of the process from the shape before folding to the shape after folding. Explaining the principle, the opening and bottom surfaces of the container before and after the folding and in the middle of the folding are the same as the regular polygon, and the sides and vertices of the regular polygon are concentric in plan view. It will rotate relatively while maintaining. At this time, since one side of the three sides of each folding piece is also one side constituting the opening surface or the bottom surface, the shape is invariable and immobile. Since the apex that is distant from one side that does not change the shape rotates while maintaining concentricity, an arcuate locus is drawn in plan view. That is, each time the rotation angle increases, the apex shifts slightly in the circumferential direction. Further, the position of the apex decreases in the height direction while shifting in a circular arc shape in the circumferential direction. Therefore, the position of the vertex for each rotation angle is constrained to one point of an arc-shaped locus in the circumferential direction, and one side constituting the opening surface or the bottom surface is also constrained in its shape. On the other hand, the other two sides (two sides in the height direction) of each triangle are not constrained in shape, so that they are deformed so as to be twisted in the folding process.

This will be described in more detail with reference to FIG. First, the following (1) to (3) are assumed.
(1) FIGS. 7A and 7B show an opening surface, a bottom surface, and one trapezoidal piece of the folding container before folding. The folding container has a small regular polygon among concentric regular polygons as an opening surface side and a large regular polygon as a bottom surface side.
(2) Three vertices of a certain triangle are A, B, and C points, two bottom points are A, B points, and one opening point is C point. The BC line is a diagonal line of the valley fold line, and the AC line is a mountain fold line.
(3) By rotating the opening surface side with respect to the bottom surface side (by moving the C point to the C ′ point in FIG. 7A), it is folded as shown in FIGS.

  From the above assumptions (1) to (3), the following can be derived. Since the bottom surface does not move, two points A and B on one side constituting the bottom surface are fixed points. Accordingly, the point C becomes a movable point, and the locus of the point C in plan view becomes a part (arc portion) of a polygon circumscribed circle forming the opening surface and moves to the point C ′. Further, since the point C moves also in the height direction, the locus of the point C is spiral as a whole. Then, when the point C moves spirally, a twisting force (deformation force) acts on the AC line and the BC line.

  Since the shape maintaining force against this deformation force (the force that can resist deformation) acts on each folding piece, the total deformation force, that is, the folding force (opening with respect to the bottom surface) is greater than the sum of the shape maintenance forces of all the folding pieces. The container is folded only when the rotational force of the surface increases. The harder the container, the greater the folding force and the easier it is to fold.

  Further, even if the volume is reduced by folding, the triangular folding pieces simply overlap one above the other, and when the folding force is released, the container tries to return to the original shape with a large volume by the restoring force.

  The folding container of the present invention has been created in view of the above circumstances, and its purpose is to make it easier to fold and to maintain the folded state as much as possible.

  The present invention is a folding container including a cylindrical body and a bottom that closes the lower end of the body, and the body before folding includes a cylindrical body part in the entire height in the vertical direction. The body portion is formed in a regular polygon having the same number of vertices and the same center when viewed from the top and bottom, and the upper and lower sides are the same in a side view over the entire length in the circumferential direction. A trapezoidal piece of a shape is continuously repeated. Each trapezoidal piece having the same shape includes two triangular folding pieces on both sides of a valley fold line as a diagonal line that bisects the trapezoidal region. The triangular area of each folding piece is divided into an upper folding piece, a middle folding piece, and a lower folding piece in order from the top to the bottom. In addition, the boundary line between two trapezoidal pieces adjacent to each other is a mountain fold line that can be bent into a lightning bolt with the middle folding piece as the center. The folded pieces are configured to overlap with a part of the boundary line as the axis of symmetry.

The shape of the middle folded piece is not limited, but it is difficult to fold if the middle folded piece has a complicated shape. In order to facilitate folding, the following is desirable.
That is, the half-folded piece is a triangle and one side of the triangle is a part of the axis of symmetry.

By the way, the material of the folding container does not matter. When the middle folded piece is a triangle, one of the three vertices of the middle folded piece is arranged on a diagonal line. Since the half-folded piece is folded so that this one point is a fixed point, a force at the time of folding is applied to the fixed point. If the fixing points of the two half-folded pieces existing on both sides of the diagonal line are present at the same position on the diagonal line, the force at the time of folding concentrates at that position, and the fixing point is likely to be damaged. To prevent this, it is desirable to do the following.
That is, the trunk body is made of synthetic resin, and each trapezoidal piece has one point of three vertices of each half-folded piece arranged at different positions on the diagonal.

Further, since the folding work is to rotate the body in one direction with respect to the bottom while maintaining concentricity, the user applies a rotational force to the folding container. At this time, the barrel lowers its overall height while rotating. When the rotational force is released, the folding container tries to return to its original shape by the restoring force. However, the folding forms a crease on the sides that form the periphery of each piece, and the fold cannot return to the original shape, and the boundary is bent in a lightning bolt shape. When a force against the restoring force is present in the folded container, the folded state is maintained. Further, the larger the rotation angle of the barrel, the lower the overall height of the folded folding container.
For this purpose, it is desirable to do the following. That is, in a state where the boundary line is in a straight line before folding, one side of the middle folded piece on the boundary line forms a part of the straight line, and in the state where the boundary line is bent at a steep angle to a lightning bolt in the middle of folding, One side of the half-folded piece on the boundary line is inclined in one direction with respect to the vertical line, and after folding, one side of the middle-folded piece on the borderline is It is inclined in the other direction with respect to the line.

Furthermore, although the trunk | drum may be comprised only by the trunk | drum main-body part, in order to make it easy to drink, it is desirable that there is a so-called mouth part which attaches a mouth. In addition, the body may be the same thickness in any part, but it is difficult to fold. Therefore, it is desirable to make it easy to drink and fold as follows.
In other words, the barrel includes an annular mouth portion extending over the entire circumference in the circumferential direction on the upper side of the barrel main body, and each side surrounding the main body of each piece is formed thinner than the main body of each piece.

Moreover, it is not ask | required whether the shape of a trunk | drum main-body part is the same diameter from a lower end to an upper end. However, it is desirable to make it easy to fold and mold as follows.
That is, the diameter of the trunk body before folding gradually widens from the lower end to the upper end, and the two folding pieces of each trapezoidal piece before folding are located radially inward of the trunk body section with the diagonal line as the center. It is bent.

  According to the folding container of the present invention, each folding piece is formed of an upper folding piece, a middle folding piece, and a lower folding piece, so that the regular polygons at the upper and lower ends of the trunk main body are relatively concentric. When twisted, the twisting force is distributed to the upper, middle, and lower folded pieces of each folded piece, which facilitates folding. In addition, if the twisting force is dispersed, the restoring force is also dispersed, and two middle folded pieces are bordered on both sides of the mountain fold line that is the borderline between two adjacent trapezoidal pieces. The two folding pieces on both sides of the boundary line overlap with each other with the boundary line bent in a lightning bolt shape. A force acts and it is easy to maintain the folded shape of the folding container.

  If the half-folded piece is a triangle and one side of the triangle is the axis of symmetry, one point of the triangle is located on the diagonal, and the half-folded piece is folded so that one point is a fixed point. Therefore, it is easy to fold the folding container.

  Furthermore, if each trapezoidal piece has one of the three vertices of each half-folded piece arranged at different positions on the diagonal, the force applied when it is folded will be distributed to two points at different positions and concentrated at one point. It is harder to break and easier to fold than the configuration (configuration in which one of the three vertices of each half-folded piece is arranged at the same position on the diagonal). In addition, a force that is twisted when folded is applied to the line segment connecting two vertices at different positions on the diagonal line. However, since the body portion is made of synthetic resin, the line segment is formed by the elasticity of the synthetic resin. Is slightly stretched, and as a result, the folding container is not easily damaged and is easily folded.

  Also, when the folding direction of one side of the middle folded piece on the boundary line changes from one direction to the other direction with respect to the vertical line before folding is completed, it can be folded at a larger rotation angle, so the overall height is low It will be in a folded state. In addition, when the boundary line is bent at a gentle angle, each folded piece has a stable shape that approximates the original triangle, and a force that opposes the restoring force acts on each folded piece. Since the adjacent trapezoidal pieces are overlapped so that the upper and lower folds are sandwiched from above and below, a force that prevents each middle fold from returning to the vertical direction acts, so the overall shape is large. Stability is applied, and the folded state with a low overall height is maintained.

  Furthermore, it is easier to drink if it has an annular mouth part over the entire circumference in the circumferential direction on the upper side of the trunk body part, and each side surrounding the body part of each piece is made thinner than the body part of each piece If so, each side can be easily folded, and as a result, each piece can be easily folded.

  Further, if the diameter of the body portion of the synthetic resin folding container is gradually widened from the lower end to the upper end, the shape is easy to be molded as a taper when the folding container is injection molded. In addition, if the two folding pieces of each trapezoidal piece are bent inward in the radial direction of the trunk body portion with the diagonal line as the center, the folding container can be easily folded.

(A)-(C) is a side view, a plan view, and a bottom view showing a folding container according to the first embodiment of the present invention. FIGS. 1A to 1E are a cross-sectional view taken along line AA in FIG. 1, an end view taken along line BB, an end view taken along line CC, and an end view taken along line DD. . (A)-(e) figure is a top view which shows the folding procedure of the folding container of 1st embodiment. (A)-(e) figure is a side view which shows the folding procedure of the folding container of 1st embodiment. (A) and (B) are perspective views showing a state before and after folding of the folding container of the first embodiment. (A)-(c) is a side view which shows the folding procedure of the folding container of 2nd embodiment of this invention. (A)-(d) figure is the top view and perspective view explaining the folding condition of the conventional folding container.

  The folding container 1 of 1st embodiment of this invention is a cup as shown in FIG. 1, FIG. This cup is made of a synthetic resin, and therefore has both rigidity and elasticity. For example, polypropylene or an elastomer is used as the synthetic resin. The cup includes a cylindrical body 2 and a bottom 3 that closes the lower end of the body 2.

  The bottom 3 is a so-called raised bottom, and includes a bottom main body portion 3a that closes the lower end of the body 2, and an installation portion 3b that hangs down from an edge of the bottom main body portion 3a. The edge of the bottom body portion 3a is a regular polygon 5b (more specifically, a regular dodecagon), and the installation portion 3b is formed from the edge of the bottom body portion 3a (more specifically, from the polygonal edge of the bottom body portion 3a). It is provided in a circular shape when viewed from the bottom so as to be continuous over the entire circumference of the portion slightly located on the inner side in the radial direction.

  The body 2 before folding constitutes an annular mouth portion 4 constituting the upper end portion of the total height in the vertical direction, and a portion other than the upper end portion, that is, a portion other than the mouth portion 4 of the total height in the vertical direction. And a cylindrical trunk body 5.

  The mouth portion 4 includes an annular (more specifically, cylindrical) mouth body 4a, and an annular (more specifically, circular in plan view) rib 4b continuous over the entire inner periphery of the mouth body 4a. ing. A plurality of ribs 4b protrude above and below the mouth part main body 4a with a gap therebetween.

  When viewed from above, the shapes of the upper and lower ends of the trunk body 5 are regular polygons 5a and 5b. The upper and lower regular polygons 5a and 5b are so-called concentric with the same center and have a similar relationship with the same number of vertices, and the upper regular polygon 5a is formed larger than the lower regular polygon 5b. Has been. Therefore, the diameter (inner diameter and outer diameter) of the trunk body 5 gradually increases from the lower end toward the upper end. Further, when viewed from the side, the trunk body 5 is formed by continuously repeating trapezoidal pieces 6 having the same shape over the entire length in the circumferential direction.

  The trapezoidal piece 6 is such that the upper side 6a and the lower side 6b are parallel (more specifically, horizontal). However, since the upper side 6a is longer than the lower side 6b, the left side 6c and the right side 6c are not parallel, and therefore the trapezoidal piece 6 is not a parallelogram. The trapezoidal piece 6 is formed with a diagonal line 6d that bisects its own trapezoidal region, and the diagonal line 6d is inclined downward in the figure. Since all the trapezoidal pieces 6 have the same shape, the inclination directions of the diagonal lines 6d are aligned. With reference to the side view, the boundary line 6c (left side 6c and right side 6c) between adjacent trapezoidal pieces 6 is a mountain fold line, and the diagonal line 6d is a valley fold line. The boundary line 6c is inclined with respect to the vertical line as viewed from the side. Two triangular folding pieces 7 are formed on both sides of the diagonal line 6d. Incidentally, the two folding pieces 7, 7 are slightly bent inward in the radial direction of the body 2 with the diagonal line 6d as the center. In other words, assuming that the trunk body 5 is cut in the horizontal direction in the middle of the overall height of the trunk body 5, each side (one point corresponding to the diagonal line 6d) of the cut end surface 5c is shown in FIG. As shown, the trapezoidal piece 6 is arranged on the inner side in the radial direction of the trunk body 5 with respect to a line segment 5f connecting two points corresponding to the left and right boundary lines 6c, 6c in a straight line. That is, the folding pieces 7 are arranged on the inner side in the radial direction of the body 2 except for the upper and lower ends of the diagonal line 6d from the virtual plane surrounded by the left and right boundary lines 6c, the upper side 6a, and the lower side 6b. Each folding piece 7 is formed to be inclined so as to spread outward in the radial direction of the body 2 from the lower end to the upper end of the body main body 5. This is a state immediately after molding, taken out from an injection mold, so-called molded product. Therefore, the boundary line 6c and the diagonal line 6d are easy to fold as a mountain fold line and a valley fold line, which will be described in detail later, immediately after molding. Incidentally, when the folding container 1 is injection-molded, the vertical direction of the barrel 2 is the mold opening direction. Therefore, when the movable mold is moved in the mold opening direction after injection molding, the diameter (inner diameter and outer diameter) of the trunk body 5 gradually increases from the lower end to the upper end (each folding piece 7 is at the lower end). (Because it is inclined so as to spread outward in the radial direction of the body 2 from the upper end to the upper end), it becomes a so-called punching taper and is easy to release.

  The folding piece 7 is formed with two partition lines 12a and 12b for dividing the triangular area of the folding piece 7 in the vertical direction. Therefore, each folding piece 7 is an upper folding piece positioned on the upper side in the height direction. 11, a middle folded piece 12 located in the middle of the height direction, and a lower folded piece 13 located on the lower side in the height direction. The folding piece 7 located on the left side with respect to the diagonal line 6d has one side of its triangle as the lower side 6b of the trapezoidal piece 6, the upper folding piece 11 and the middle folding piece 12 as a triangle, and the lower folding piece 13 as a quadrangle. On the other hand, the folding piece 7 positioned on the right side with respect to the diagonal 6d has one side of its own triangle as the upper side 6a of the trapezoidal piece 6, the upper folding piece 11 as a quadrangle, and the middle folding piece 12 and the lower folding piece 13 as triangles. To do. In other words, the left and right folding pieces 7, 7 with respect to the diagonal 6d are triangles that approximate a similar shape. Note that the reason for the approximation is that, as described above, the lengths of the upper side 6a and the lower side 6b are different.

  The middle folded piece 12 has one of the three vertices of the triangle at the intermediate height portion on the diagonal line 6d and the remaining two points at the intermediate height portion on the boundary line 6c. Further, the line segment between these remaining two points is a line-symmetrical symmetry axis, and the middle folded pieces 12, 12 on both sides are line-symmetrical with respect to the symmetry axis. Of the three sides of the middle folded piece 12, except for one side which is an axis of symmetry, one side 12a of the upper folded piece 11 and one side 12b of the lower folded piece 13 are configured. Further, the middle folded pieces 12 on both the left and right sides with respect to the diagonal line 6d are separated from each other at one point on the diagonal line 6d. One point on the diagonal line 6d of the left middle folded piece 12 is positioned higher than one point on the diagonal line 6d of the right middle folded piece 12.

The upper folded piece 11 on the left side with respect to the diagonal 6d has one of the three vertices of the triangle as the left end point of the upper side 6a, the other point as the upper end point of the symmetry axis of the left middle folded piece 12, and the remaining one point Let it be one point on the diagonal 6d of the left middle folded piece 12.
On the other hand, the upper folded piece 11 on the right side with respect to the diagonal 6d has two points of the four vertices of the quadrangle as the left and right end points of the upper side 6a, the other point as the upper end point of the symmetry axis of the right middle folded piece 12, and the remaining points. One point is defined as a point on the diagonal line 6d of the middle folded piece 12 on the right side.

The lower folded piece 13 on the left side with respect to the diagonal 6d has two points as the left and right end points of the lower side 6b among the four vertices of the quadrangle, and the other point as the lower end point of the symmetry axis of the left middle folded piece 12. Is a point on the diagonal 6d of the left middle folded piece 12.
On the other hand, the lower folded piece 13 on the right side with respect to the diagonal 6d has one point as the right end point of the lower side 6b among the three vertices of the triangle, the other point as the lower end point of the symmetry axis of the right middle folded piece 12, and the remaining one point. Is a point on the diagonal line 6d of the middle folded piece 12 on the right side.

  Each of these pieces, that is, not only the trapezoidal piece 6 and the folding piece 7 but also the upper folded piece 11, the middle folded piece 12, and the lower folded piece 13 which are the smallest unit of the piece, And each side that surrounds. In other words, each piece is composed of each side that forms the periphery of the piece and a main body that closes a region surrounded by each side. And the thickness of each side is formed thinner than the thickness of the main body, so that each side can be easily bent. Each side is shown as a straight line having almost no width in the drawing. However, in the actual product, the folding container 1 itself has a thickness, so that it can be folded as a belt-like side with a certain width. is there. Each such side is a mountain fold line or a valley fold line.

In the illustrated example, the mountain fold line is a boundary line 6c located between adjacent trapezoidal pieces 6, in other words, the left side 6c and the right side 6c of the trapezoidal piece 6, the upper side 6a and the lower side 6b of the trapezoidal piece 6, and the upper left side. One side 12 a located between the folded piece 11 and the middle folded piece 12, and one side 12 b located between the right middle folded piece 12 and the lower folded piece 13.
On the other hand, the valley fold line is a diagonal line 6d, a side 12a located between the left middle folded piece 12 and the lower folded piece 13, and a side 12b located between the right upper folded piece 11 and the middle folded piece 12. .

The folding container 1 is folded as follows as shown in FIGS. 3 and 4 (A) to (E) and FIGS. 5 (A) and (B).
(1) As shown in FIG. 3, FIG. 4, and FIG. 5 (A), the folding container 1 is in a cylindrical state in the cylinder 2 in a state before folding (a state immediately after molding). The boundary line 6c is in a straight line state, and a part of the straight line is also one side of the half-folded piece 12 on the boundary line 6c. From this state, make a small crease on each mountain fold line and valley fold line. Thereafter, the upper end portion of the body 2 is rotated relative to the bottom 3 in one circumferential direction so as to be twisted. More specifically, the upper end of the body 2 is rotated in the clockwise direction in a plan view while keeping the upper and lower regular polygons 5a and 5b concentric.
(2) When twisting is started, the twisting force is distributed to the upper, middle, and lower folding pieces 11, 12, and 13, and each folding piece 7 is easily folded according to the mountain fold line and the valley fold line. . Further, each folded piece 12 is folded so that one point on the diagonal line 6d is a fixed point, so that it is easy to fold. In addition, since each point of the vertices of the two middle folding pieces 12 and 12 is arranged at different positions on the diagonal 6d, the force applied when folded is distributed to different positions, so that it is difficult to break and easy to fold. Moreover, a force that is twisted when folded is applied to the line segment connecting two different vertices on the diagonal line 6d, and the line segment that receives the action is slightly stretched by the elasticity of the synthetic resin, so that it is difficult to break. It becomes easy to fold.
(3) In the first stage in the middle of such folding, as shown in FIG. 4 (b), the trunk body 5 has a form in which the middle part of the entire height is narrowed to the center part in the width direction, The cocoon also has a drum shape, and gradually approaches the direction in which the two half-folded pieces 12 and 12 located on both sides with respect to the symmetry axis overlap each other. In the middle of the folding, the boundary line 6c is bent at a steep angle in a lightning bolt shape, and one side (symmetric axis) of the middle folded piece 12 on the boundary line 6c is inclined in one direction with respect to the vertical line. When viewed in plan as shown in FIG. 3 (b), the diagonal 6d moves near the center folded piece 12 to the inside in the radial direction of the barrel 2 relative to the boundary line 6c. Are concentrated toward the inside in the radial direction of the body 2, and a star-shaped hole 5 h is formed below the mouth 4. This state is maintained by the rigidity of the synthetic resin.
(4) When turned further, in the second stage in the middle of folding, as shown in FIG. 4 (c), when viewed from the side, the overall height of the trunk body 5 is greatly reduced, and the two of the two positions located on both sides with respect to the symmetry axis The folded pieces 12, 12 overlap. In addition, each boundary line 6c is tilted in a state of being substantially close to the horizontal while being bent at a steep angle to a lightning bolt, and one side of the half-folded piece 12 on the boundary line 6c is in one direction (right shoulder) with respect to the vertical line. The slope is rising up, and the slope is approaching the vertical direction. When viewed in plan as shown in FIG. 3C, the diameter of the hole 5h narrows and approximates a circle. This state is also maintained by the rigidity of the rigid resin.
(5) When turned further, in the third stage in the middle of folding, when viewed from the side as shown in FIG. 4 (d), the boundary line 6c remains bent in a lightning bolt shape, and one side of the middle folded piece 12 on the boundary line 6c is It becomes a vertical state. Incidentally, at this time, the two half-folded pieces 12 and 12 located on both sides with respect to the symmetry axis remain overlapped. Further, when viewed in plan as shown in FIG. 3 (d), the diameter of the hole 5h becomes narrower. When one side of the folded piece 12 is in a vertical state, it is an unstable state, and is easily returned to the state (4) by the restoring force.
(6) When it is further turned, folding is completed. After this folding, as shown in FIG. 4 (e), when viewed from the side, the boundary line 6c is bent in a lightning bolt at a gentle angle, and one side of the middle folded piece 12 on the boundary line 6c Inclined in the other direction (down shoulder). Incidentally, the two half-folded pieces 12 and 12 located on both sides with respect to the symmetry axis remain overlapped. Moreover, the upper folded pieces 11 and 11 and the pair of lower folded pieces 13 and 13 that constitute the trapezoidal pieces 6 are also folded and overlapped. Then, the pair of overlapping middle folding pieces 12 and 12 are overlapped so that the pair of upper folding pieces 11 and 11 and the pair of lower folding pieces 13 and 13 are sandwiched from above and below in the circumferential direction. As shown in FIG. 3E, the hole 5h is very small when viewed in plan. In this state, even if the rotational force is released, the state is maintained and hardly returns to the state (4). This seems to be due to the force acting against the restoring force to return to the state of (2). When viewed in plan as shown in FIG. 3 (e), in a state where the hole 5h is small, when viewed from the side as shown in FIG. The folding piece 7 has a stable shape that approximates the original triangular shape before folding. Due to the shape approximated to this triangular shape, a force against the restoring force acts. Moreover, as described above, a pair of upper folded pieces 11 and 11 and a pair of lower folded pieces 13 and 13 of the adjacent trapezoidal piece 6 are sandwiched from above and below with respect to the pair of overlapping middle folded pieces 12 and 12 as described above. The overlapping force acts to prevent each center folded piece 12 from returning in the vertical direction. Such a combined action is considered to be a large shape stabilizing force, and the folded state is maintained. In addition, a large rotation angle is applied until one side of the middle folded piece 12 on the boundary line 6c changes from one direction to the other with respect to the vertical line, and as a result, the overall height of the folding container 1 becomes very low. ing.

  3 to 5, when a force that rotates in the opposite direction from the folded state is applied from the completely folded state as shown in FIG. After that, the state returns to each (d) or each (b) of FIG. 3 and FIG. 4 according to the rotation angle. Once folded, the mountain fold line and the valley fold line are creased, so the state of FIG. 3 and FIG. Each of the states (b) in FIGS. 3 and 4 is a form in which the diameter is narrowed at the middle part of the overall height of the trunk body part 5, and is also an easy-to-grip form. In this form, for example, a beverage is used. When viewed in a plan view, each upper folded piece 11 extends from the inner periphery of the mouth 4 toward an eccentric position (a position deviated from the center) in the radial direction. For this reason, all the upper folding pieces 11 are arranged in a spiral shape as a whole. Then, when the folding container 1 is tilted in an attempt to drink the beverage stored in the folding container 1, the beverage is discharged as a swirling flow when passing through the trunk body 5. Then, when trying to drink with the mouth on the mouth portion 4, the beverage is likely to flow toward the left or right end of the lips or the cheek rather than into the mouth. However, since the plurality of annular ribs 4b are formed in the mouth portion 4, the swirling flow is weakened by the ribs 4b, and the beverage flows into the mouth. In addition, since the plurality of ribs 4b are provided, the swirl flow is greatly weakened, and the beverage flows almost along the inclination angle where the folding container 1 is inclined. If the rib 4b is formed in an arc shape only at a part of the entire circumference of the mouth portion 4, the rib 4b must be brought close to the mouth and the folding container 1 should not be tilted when drinking a beverage. Although the effect of weakening the swirl flow by 4b cannot be obtained, the effect of weakening the swirl flow by the rib 4b is always obtained if the rib 4b is formed annularly over the entire circumference of the mouth portion 4 as in this embodiment. It is done. Incidentally, when tested in the state before each folding in (a) of FIGS. 3 and 4, even in this state, the folded pieces 7 are arranged in a spiral shape, and the same effect can be obtained when the ribs 4b are provided. . As an experimental example, there is an example in which ribs 4b extending in the vertical direction with respect to the inner periphery of the mouth portion 4 are provided at intervals in the circumferential direction. In this case, the effect of weakening the swirling flow by the ribs 4b is almost obtained. I couldn't.

  As shown in FIG. 6, the folding container 1 according to the second embodiment of the present invention is a mountain fold line with respect to two sides 12 a and 12 b excluding a part of a boundary line 6 c serving as an axis of symmetry among the three sides of the middle folded piece 12. And that the valley fold line is reversed from that of the first embodiment, that the left and right boundary lines 6c of each trapezoidal piece 6 are inclined closer to the horizontal direction than that of the first embodiment, on the diagonal 6d Unlike the folding container 1 of the first embodiment, the distance between two vertices that are spaced apart from each other (the vertices of the two middle folded pieces 12) is farther than that of the first embodiment. It is a point.

  In the folding container 1 of the second embodiment, a slight crease is made on the mountain fold line and the valley fold line from the state shown in FIG. When folded so as to be twisted in one direction, the folded state as shown in FIG. 6 (c) is obtained after the state shown in FIG. The boundary line 6c is bent in a lightning bolt shape around the piece 12, and the two middle folded pieces 12, 12 located on both sides with respect to the symmetry axis are overlapped. However, the overall height is higher than the folded state of the first embodiment. Further, when the part of the middle folded piece 12 of the boundary line 6c is folded, only the state shown in FIGS. 6 (b) and 6 (c) is obtained, and the first embodiment shown in FIGS. 3 and 4 (c) (d). It will not be in the state. As described above, this is because the mountain fold line and valley fold line of the two sides of the middle folded piece 12 are reversed from those of the first embodiment. When the folded container 1 in the folded state is returned to its original position and the upper end portion of the trunk body portion 5 is twisted in the opposite direction to the circumferential direction, as shown in FIG. It becomes.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. For example, the diameter (inner diameter and outer diameter) of the trunk body 5 is not limited to a so-called tapered shape that gradually spreads from the lower end to the upper end, but is a so-called bellows-like shape that is uniform from the lower end to the upper end. May be. The number of corners of the regular polygons 5a and 5b of the trunk body 5 is not limited to twelve but may be four or more. The cross section of the mouth 4 is not limited to a circle, and may be the same regular polygon as the trunk body 5.

DESCRIPTION OF SYMBOLS 1 Folding container 2 Cylinder 3 Bottom 3a Bottom main body part 3b Installation part 4 Mouth part 4a Mouth part main body 4b Rib 5 Body main part 5a Regular polygon 5b Regular polygon 5c Cutting part end surface 5f Line segment 5h hole 6 Trapezoid piece 6a Upper side 6b Lower side 6c Left side (boundary line)
6c right side (boundary line)
6d diagonal line 7 Folding piece 11 Upper folding piece 12 Middle folding piece 12a one side (division line)
One side of 12b (parting line)
13 Bottom fold

Claims (6)

A folding container having a cylindrical trunk and a bottom closing the lower end of the trunk,
The body before folding is provided with a cylindrical body part in the overall height in the vertical direction,
The body portion is formed in a regular polygon having the same number of vertices and the same center when viewed from the top and bottom, and the upper and lower sides are the same in a side view over the entire length in the circumferential direction. It is a continuous series of trapezoidal pieces of shape,
Each trapezoidal piece of the same shape is provided with two triangular folding pieces on both sides of the valley fold line as a diagonal line that bisects the trapezoidal area,
The triangular area of each folded piece is partitioned into an upper folded piece, a middle folded piece, and a lower folded piece in order from top to bottom,
The boundary line between two adjacent trapezoidal pieces is a mountain fold line that can be bent into a lightning bolt with the middle fold as the center. When bent, the two middle folds on both sides of the boundary line A folding container characterized in that a part thereof is overlapped with a line symmetry axis.   The folding container according to claim 1, wherein the middle folded piece is a triangle, and one side of the triangle is a line-symmetric axis of symmetry. The trunk body is made of synthetic resin,
3. The folding container according to claim 2, wherein each trapezoidal piece is inclined when the boundary line is viewed from the side, and one of the three vertices of each middle folded piece is arranged at a different position on the diagonal line. . When the boundary line is in a straight line before folding, one side of the middle folded piece on the boundary line forms a part of the straight line,
In the state where the boundary line is bent at a steep angle to the lightning bolt in the middle of folding, one side of the middle folded piece on the boundary line is inclined in one direction with respect to the vertical line,
4. The folding according to claim 3, wherein one side of the middle folded piece on the boundary line is inclined in the other direction with respect to the vertical line in a state where the boundary line is bent at a gentle angle to the lightning bolt after folding. container. The trunk is provided with an annular mouth extending over the entire circumference in the circumferential direction above the trunk main body.
5. The folding container according to claim 1, wherein each side surrounding the periphery of the main body of each piece is formed thinner than the main body of each piece. It is a folding container made of synthetic resin,
The diameter of the trunk body before folding gradually widens from the lower end to the upper end,
The folding according to claim 1, 2, 3, 4 or 5, wherein the two folding pieces of each trapezoidal piece before folding are bent inward in the radial direction of the trunk body portion with a diagonal line as a center. container.

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