FIELD AND BACKGROUND OF THE INVENTION

The present invention, in some embodiments thereof, relates to collapsible structures and, more particularly, but not exclusively, to a weight supporting collapsible structures.

BACKGROUND OF THE INVENTION

Foldable play structures are known in the art. However they are generally not suitable for children to climb on; and if they are suitable for children to climb on they generally fold into several parts and/or fold into large sizes which are generally heavy and not easily portable.

For example, the collapsible slide disclosed in EP 1348472 Al is suitable for children to climb on, but employs structures which are large, heavy and not easily portable. The cardboard play structure disclosed in U.S. Patent Publication No.

20110281495A1 disassembles into several parts.

For another example, the pop-out play structure disclosed in U.S. Patent

Publication No. 20110281496A1 comprising a foldable pop up play structure; this structure is portable but not suitable for kids to climb on.

SUMMARY OF THE INVENTION

According to an aspect of some embodiments of the present invention there is provided a collapsible structure for fixating a predetermined angle between panels, comprising: a first structure panel (101); a second structure panel (102) connected to the first structure panel via a main folding line (110); a first support panel (103) connected to the first structure panel via a first support folding line (111); and a second support panel (104) connected to the second structure panel via a second support folding line (112) and connected to the first support panel via a reversible folding line (113); wherein when the structure is in a collapsed position, the first structure panel, the second structure panel, the first support panel and the second support panel are adjacent and generally parallel to each other; wherein when the structure is in an erected position, the first support panel is adjacent to the first structure panel and the second support panel supports a rigid angle (120) between the first structure panel and the second structure panel; and wherein the sum of the angle (121) between the main folding line and the first support folding line and the angle (123) between the first support folding line and the reversible folding line equals the sum of the angle (122) between the main folding line and the second support folding line and the angle (124) between the second support folding line and the reversible folding line.

Optionally, the folding lines are all intersecting at one point.

Optionally, at least one of the folding lines is created by folding one panel along a line.

Optionally, at least one of the folding lines is created by attachment of an extension of one of the panels to another of the panels.

More optionally, the extension is foldable with at least one folding line, so one panel of the extension is attached to the another of the panels.

Optionally, the panels are made of cardboard.

According to some embodiments of the present invention there is provided a method for erecting the collapsible structure, comprising: providing the collapsible structure in a collapsed position; opening the main folding line so a main angle between the first structure panel and the second structure panel is opened; increasing the main angle so the reversible folding line is straightened; reversing the fold of the reversible folding line; and decreasing the main angle to the rigid angle.

Optionally, the collapsible structure is included in a collapsible structure having at least five panels.

According to some embodiments of the present invention there is provided a collapsible plaything comprising the collapsible structure.

According to an aspect of some embodiments of the present invention there is provided a collapsible structure with foldable tab panel having at least one folding line thereacross, comprising: a first structure panel (601); a second structure panel (602); at least two foldable support panels (603, 604), each one of the folding support panels is connected to the first structure panel and to the second structure panel via two support folding lines (611, 612) at opposite sides of the foldable support panel; and at least one foldable tab panel (606) each connected to one of the at least two foldable support panels via a tab folding line (613), the at least one tab panel contains at least one internal folding line (614) parallel to the tab folding line; wherein when the structure is in a collapsed position, the first structure panel, the second structure panel, the at least two foldable support panels and the at least one foldable tab panel are adjacent and generally parallel to each other, the at least two support panels and the at least one tab panel are folded; and wherein when the structure is in an erected position, the at least two support panels are straightened and the at least one tab panel is folded by the at least one internal folding line to shape a fixed rod supporting the at least one internal folding line and inserted to support a rigid distance between the first structure panel and the second structure panel.

Optionally, aid two support folding lines are parallel for at least one of the at least two foldable support panels.

Optionally, the tab folding line is perpendicular o at least one of the two support folding lines.

Optionally, at least one of the foldable support panels is connected to the full length of one of the structure panels to provide more structural strength.

Optionally, aid folded tab panel is used as a step.

According to some embodiments of the present invention there is provided a method for erecting the collapsible structure, comprising: providing the collapsible structure in a collapsed position; separating between the first structure panel and the second structure panel; increasing the distance between the first structure panel and the second structure panel so the at least two foldable support panels are straightened; folding the at least one tab panel by the at least one internal folding line; and inserting the at least one tab panel between the first structure panel and the second structure panel to support a rigid distance.

According to an aspect of some embodiments of the present invention there is provided a collapsible structure with interlocking slit, comprising: a first structure panel (1001); a second structure panel (1002) connected to the first structure panel via a main folding line (1010); a support panel (1003) connected to the first structure panel and the second structure panel via the main folding line, the a support panel having a slit (1030) at the edge opposite to the main folding line; and a foldable internal panel (1004) connected to the first structure panel via a first internal folding line (1011) and connected to the second structure panel via a second internal folding line (1012); wherein when the structure is in a collapsed position, the first structure panel, the second structure panel, the support panel and the foldable internal panel are adjacent and generally parallel to each other, the support panel and the foldable internal panel are between the first structure panel and the second structure panel and the internal panel is folded; and wherein when the structure is in an erected position, the internal panel is straightened and inserted inside the slit, preventing the foldable internal panel from folding to support a rigid angle between the first structure panel and the second structure panel.

Optionally, when the internal panel is straightened and inserted inside the slit the internal panel is perpendicular to the slit.

Optionally, the structure panels have at least one folding line.

Optionally, the foldable internal panel is made from extensions of the structure panels.

Optionally, at least one of the internal folding lines is created by attachment of a tab which is an extension of the foldable internal panel to one of the structure panels.

Optionally, at least one of the internal folding lines is created by attachment of an extension of the foldable internal panel to a cut-out part of one of the structure panel.

According to some embodiments of the present invention there is provided a method for folding the collapsible structure, comprising: providing the collapsible structure in an erected position; deflecting the support panel to be adjacent to one of the first structure panel and the second structure panel; folding the foldable internal panel; decreasing an angle between the first structure panel and the second structure panel until the panels are adjacent.

Unless otherwise defined, all technical and/or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of embodiments of the invention, exemplary methods and/or materials are described below. In case of conflict, the patent specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and are not intended to be necessarily limiting.

BRIEF DESCRIPTION OF THE DRAWINGS

Some embodiments of the invention are herein described, by way of example only, with reference to the accompanying drawings. With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of embodiments of the invention. In this regard, the description taken with the drawings makes apparent to those skilled in the art how embodiments of the invention may be practiced.

In the drawings:

FIG. 1 is a schematic illustration of a collapsible structure for fixating a predetermined angle between panels when pressure is applied on the panel(s) according to some embodiments of the present invention;

FIG. 2A is a schematic illustration of a collapsible structure for fixating a predetermined angle between two panels having folding lines created by attachment of tabs, according to some embodiments of the present invention;

FIG. 2B and FIG. 2C are schematic illustrations of collapsible structures for fixating a predetermined angle between two panels having folding lines created by attachment of foldable tabs, according to some embodiments of the present invention;

FIG. 2D is a schematic illustration of a collapsible structure for fixating a predetermined angle between two panels having folding lines at the edges of the panels, according to some embodiments of the present invention;

FIG. 3 is a flowchart schematically representing a method for erecting the collapsible structure of FIG. 1, according to some embodiments of the present invention;

FIG. 4A is a schematic illustration of a complex collapsible structure having multiple collapsible structures for fixating a predetermined angle between panels, according to some embodiments of the present invention;

FIG. 4B is a schematic illustration of a complex collapsible structure having collapsible structures fixating all angles between the structure panels, according to some embodiments of the present invention; FIG. 4C is a schematic illustration of a complex collapsible structure having angles between structure panels that are not fixated by collapsible structures, according to some embodiments of the present invention;

FIG. 4D is a schematic illustration of a collapsible structure having collapsible structures for fixating a predetermined angle between panels, according to some embodiments of the present invention;

FIG. 4E is a schematic illustration of a process of erecting the collapsible structure of FIG. 4A, according to some embodiments of the present invention;

FIG. 5A, which is a schematic illustration of an exemplary collapsible cardboard play slide structure having collapsible structures for fixating a predetermined angle between panels, according to some embodiments of the present invention;

FIG. 5B is a schematic illustration of a process of erecting the collapsible structure of FIG. 5A, according to some embodiments of the present invention;

FIG. 5C is a schematic illustration of the spread parts of the collapsible structure of FIG. 5A and its construction, according to some embodiments of the present invention;

FIGs. 6 A, 6B, 6C, 6D and 6E are schematic illustrations of a collapsible structure with foldable tab panel having one or more folding line thereacross, according to some embodiments of the present invention;

FIGs. 7A, 7B, 7C, 7D, 7E, 7F, 7G and 7H are schematic illustrations of exemplary collapsible structures with foldable tab panel having one or more folding line thereacross, according to some embodiments of the present invention;

FIG. 8 is a flowchart schematically representing a method for erecting the collapsible structure of FIG. 6, according to some embodiments of the present invention;

FIG. 9A and FIG. 9B are a schematic illustrations of an exemplary collapsible cardboard play locomotive structure with foldable tab panels having folding lines thereacross, according to some embodiments of the present invention;

FIG. 9C is a schematic illustrations of a process of erecting the collapsible structure of FIG. 9A, according to some embodiments of the present invention; FIG. 9D is a schematic illustration of the spread parts of the collapsible structure of FIG. 9A and its construction, according to some embodiments of the present invention;

FIG. 10 is a schematic illustration of a collapsible structure with interlocking slit, in an erected position, according to some embodiments of the present invention;

FIGs. 11 A, 11B, 11C, 11D and HE are schematic illustrations of exemplary collapsible structures with interlocking slit, according to some embodiments of the present invention;

FIG. 12 is a flowchart schematically representing a method for folding the collapsible structure of FIG. 10, according to some embodiments of the present invention;

FIG. 13A is a schematic illustration of an exemplary collapsible cardboard play climbing structure with interlocking slit, according to some embodiments of the present invention;

FIG. 13B is a schematic illustrations of a process of erecting the collapsible structure of FIG. 13A, according to some embodiments of the present invention; and

FIG. 13C is a schematic illustration of the spread parts of the collapsible structure of FIG. 13A and its construction, according to some embodiments of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

The present invention, in some embodiments thereof, relates to collapsible structures and, more particularly, but not exclusively, to a weight supporting collapsible structures.

For foldable play structures to be suitable for children to climb on, they must have general structural strength and specifically structural strength for weight put on top of the structure and/or on top of parts of the structure. According to some embodiments of the present invention, there are provided collapsible structures that are relatively strong to external forces, for example, carrying weight, and may be used to build play structures that are foldable as well as safe from breaking and/or crushing when climbed by children. For example, a play structure may withstand carrying weight of up to 150 kilograms. The collapsible structures may also be used to construct other structures, such as furniture and/or any other structure that requires capability of being folded up to a straightened structure and stored as well as structural strength.

The collapsible structures are made of panels connected by folding lines. The panels may be made, for example, from cardboard, corrugated material, corrugated plastic, paper, paperboard, honeycomb material, plastic sheet, plastic film, metal sheet, compound material sheet and/or any other material according to the size and required structural strength. The folding lines may be made by folding the sheets, when relatively soft material is used. For some rigid materials, etching may be required before folding. For hard materials, the folding lines may be made by using flexible connections between the panels, such as hinges. Also, the folding lines may be made by differences in thickness, for example thinner material along a line.

The panels may be of any thickness, according to the size and required structural strength. For example, two-layer cardboard of thickness of 5 millimeters (mm), three-layer reinforced cardboard of thickness of between 5mm and 15mm, plastic sheets of thickness of between 0.5mm and 1.5mm and/or any other thickness.

According to some embodiments of the present invention, there is provided a collapsible structure for fixating a predetermined angle between panels. The structure contains two structure panels connected to each other via a main folding line and two support panels connected to each other via a reversible folding line. Each structure panel is connected to a support panel via a support folding line.

When the structure is in a collapsed position, the panels are adjacent and generally parallel to each other. When the structure is in an erected position, the first support panel is adjacent to the first structure panel and the second support panel supports a rigid angle between the structure panels.

The structure has structural strength for external force applied on the structure panels. When one of the structure panels is placed on the ground, the collapsible structure has structural strength for weight put on top of the structure.

To allow the collapsed position of the structure, the sum of the angle between the main folding line and the first support folding line and the angle between the first support folding line and the reversible folding line equals the sum of the angle between the main folding line and the second support folding line and the angle between the second support folding line and the reversible folding line.

According to some embodiments of the present invention, there is provided a collapsible structure with foldable tab panel. The structure contains two structure panels, at least two foldable support panels each connected to both structure panels via two support folding lines at opposite sides of the foldable support panel, and at least one foldable tab panel connected to one foldable support panel via a tab folding line. The foldable tab panel contains at least one internal folding line parallel to the tab folding line.

When the structure is in a collapsed position, the panels are adjacent and generally parallel to each other, while the foldable support panels and the foldable tab panel are folded. When the structure is in an erected position, the foldable support panels are straightened and the foldable tab panel is folded by the internal folding line to shape a fixed rod which supports the internal folding line and inserted to support a rigid distance between the structure panels.

The structure has structural strength for external force applied on the structure panels from all sides. Also, the foldable tab panel has structural strength when folded. Weight may be put on top of the structure and/or on top of the folded tab panel.

According to some embodiments of the present invention, there is provided a collapsible structure with interlocking slit. The structure contains two structure panels connected to each other via a main folding line, a support panel also connected the structure panels via the main folding line, having a slit at the edge opposite to the main folding line and a foldable internal panel connected to each structure panel via an internal folding line.

When the structure is in a collapsed position, the panels are adjacent and generally parallel to each other, the support panel and the foldable internal panel are between the structure panels and the foldable internal panel is folded. When the structure is in an erected position, the foldable internal panel is straightened and inserted inside the slit in the support panel, preventing the foldable internal panel from folding, to support a rigid angle between the structure panels.

The structure has structural strength for external force applied on the structure panels for weight put on top of the structure. Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not necessarily limited in its application to the details of construction and the arrangement of the components and/or methods set forth in the following description and/or illustrated in the drawings and/or the Examples. The invention is capable of other embodiments or of being practiced or carried out in various ways.

Referring now to the drawings, FIG. 1 is a schematic illustration of a collapsible structure for fixating a predetermined angle between panels when pressure is applied on the panel(s) in an erected position, according to some embodiments of the present invention.

The collapsible structure 100 contains a first structure panel 101 (e.g. panel EFIJ) and a second structure panel 102 (e.g. panel EFGH), connected to each other via a main folding line 110 (e.g. line EF). Collapsible structure 100 also contains a first support panel 103 (e.g. panel ABC) which is connected to first structure panel 101 via a first support folding line 111 (e.g. line AB); and a second support panel 104 (e.g. panel ACD) which is connected to second structure panel 102 via a second support folding line 112 (e.g. line AD). First support panel 103 and second structure panel 102 are also connected to each other via an reversible folding line 113 (e.g. line AC).

When collapsible structure 100 is in a collapsed position, panels 101-104 are adjacent and generally parallel to each other. When collapsible structure 100 is in an erected position, as shown in FIG. 1, first support panel 103 is adjacent to first structure panel 101 and second support panel 104 supports a rigid angle 120 (e.g. ZGFI) between first structure panel 101 and second structure panel 102.

The sum of the angle 121 (e.g. ZEAB) between main folding line 110 and first support folding line 111 and the angle 123 (e.g. ZBAC) between first support folding line 111 and reversible folding line 113 equals the sum of the angle 122 (e.g. ZEAD) between main folding line 110 and second support folding line 112 and the angle 124 (e.g. ZD AC) between second support folding line 112 and invertible folding line 113. The relation may also be presented by the equation: ZEAB + ZCAB = ZEAD + ZDAC. This relation of the angles allows collapsible structure 100 to be in a collapsed position where main folding line 110 and reversible folding line 113 are folded and support folding lines 111 and 112 are straightened.

Rigid angle 120 may be determined from the other angles by the relation: cos a = (cos (ZDAC) - cos(ZEAD)xcos(ZEAB - ZCAB)) / (sin(ZEAB - ZCAB)xsin(ZEAD)).

Optionally, some or all of the folding lines are created by folding one panel into two panels. Optionally, some or all of the folding lines are created by attachment of tabs which are extensions of some of the panels to other panels. This may be performed when using cardboard, for example, by gluing the tabs.

Optionally, the structure is made by one sheet of material. This may be done, for example, by using folding one panel into four panels by creating three folding lines, and attaching two sides of the panel to one another, for example, by using tabs.

Optionally, the structure is made by one piece of material without attachments. This may be performed, for example, by plastic injection.

Reference is now made to FIG. 2A, which is a schematic illustration of a collapsible structure for fixating a predetermined angle between two panels having folding lines created by attachment of tabs, according to some embodiments of the present invention.

A first structure panel 201 and a second structure panel 202 are made of one structure panel with a main folding line 210. A first support panel 203 and a second support panel 204 are also made of one support panel with a reversible folding line 213 and tabs 205 and 206. The support panel is connected to the structure panel via a first support folding line 211 and a second support folding line 212 which are made by attachment of tabs 205 and 206 to first structure panel 201 and to second structure panel 202. The tabs are extensions of the support panel, which are panels created by folding the support panel along folding lines that form first support folding line 211 and a second support folding line 212 when the tabs are attached to the structure panel.

Optionally, the extension tabs are foldable, having one or more folding line, so only one panel of the tab is attached to a structure panel. Reference is now made to FIG. 2B and FIG. 2C, which are schematic illustrations of a collapsible structures for fixating a predetermined angle between two panels having folding lines created by attachment of foldable tabs, according to some embodiments of the present invention. Foldable tabs 207 and 208 each have a folding line along the tab, so one part of the tab is attached to a structure panel, and the other part is connected to a support panel. In this structure, the folding line along the tab is parallel to the folding line connecting the tab to the structure panel. Similarly, tab 209 has two folding lines along the tab.

Optionally, folding lines 110-113 are all intersecting at one point (e.g. point A). Optionally, some or all of the folding lines are not intersecting at one point; for example, when first support folding line 211 and a second support folding line 212 are constructed by different foldable tabs. An example is the collapsible structure of FIG. 2C.

Optionally, some or all of the folding lines are at the edges of the panels, so the panels are not extended beyond the folding lines. Reference is now made to FIG. 2D which is a schematic illustration of a collapsible structure for fixating a predetermined angle between two panels having folding lines at the edges of the panels, according to some embodiments of the present invention.

Reference is now made to FIG. 3, which is a flowchart schematically representing a method for erecting the collapsible structure of FIG. 1 , according to some embodiments of the present invention.

First, as shown at 301, collapsible structure 100 is provided in a collapsed position. In this position, main folding line 110 and reversible folding line 113 are folded and support folding lines 111 and 112 are straightened.

Then, as shown at 302, main folding line 110 is opened from its folded state so a main angle between first structure 101 panel and second structure panel 102 is opened. This also opens reversible folding line 113.

Then, as shown at 303, the main angle is increased so reversible folding line

113 is straightened. This is the maximal opening of the main angle, and main folding line 110 is not straightened.

Then, as shown at 304, the fold of reversible folding line 113 is reversed, so first support panel 203 faces the other side of second support panel 204, and second support panel 204 faces the other side of first support panel 203. This may be done by pushing on reversible folding line 113. Finally, as shown at 305, the main angle is decreased to rigid angle 120. Collapsible structure 100 is then in an erected position and reversible folding line 113 is partly folded, in the opposite direction from its folding in a collapsed position.

Reference is now made to FIG. 4A, which is a schematic illustration of a complex collapsible structure having multiple collapsible structures for fixating a predetermined angle between panels, according to some embodiments of the present invention.

Optionally, some or all of angles between structure panels 401-404 are fixated by collapsible structures. Each angle may be fixated by one or more collapsible structure. For example, the angle between panels 401 and 402 is fixated by two collapsible structures 431 and 432. FIG. 4B is a schematic illustration of a complex collapsible structure having collapsible structures fixating all angles between the structure panels, according to some embodiments of the present invention. FIG. 4C is a schematic illustration of a complex collapsible structure having angles between structure panels that are not fixated by collapsible structures, according to some embodiments of the present invention.

Optionally, some or all of the support panels are connected to the full length of the structure panels, to provide more structural strength. Optionally, support panels of some or all of the fixating collapsible structures are connected to support panels of other fixating collapsible structures. Optionally, the support panels are connected via one or more intermediate panels. FIG. 4D is a schematic illustration of a collapsible structure having collapsible structures for fixating a predetermined angle between panels, according to some embodiments of the present invention. Support panels 405- 408 are connected to the full length of structure panels 401 and 402. Also, support panel 405 is connected to support panel 407 via an intermediate panel 409. Optionally, intermediate panel 409 prevents main folding lines 410 and 411 from fully opening, so reversible folding lines 412 and 413 cannot be easily straightened. In this case, an external pressure may be applied on reversible folding lines 412 and 413 to straighten and reverse them. Optionally, the structure is made by one sheet of material. Reference is also made to FIG. 4E, which is a schematic illustration of a process of erecting the collapsible structure of FIG. 4A, according to some embodiments of the present invention.

Reference is now made to FIG. 5A, which is a schematic illustration of an exemplary collapsible cardboard play slide structure having collapsible structures for fixating a predetermined angle between panels, according to some embodiments of the present invention. The structure is made so a child 501 may climb stairs structure panel 502 and slide over structure panel 503. Reference is also made to FIG. 5B, which is a schematic illustration of a process of erecting the collapsible structure of FIG. 5A, according to some embodiments of the present invention. Reference is also made to FIG. 5C, which is a schematic illustration of the spread parts of the collapsible structure of FIG. 5A and its construction, according to some embodiments of the present invention. After the construction of the structure, it stays in one piece and may be folded and erected easily.

Reference is now made to FIGs. 6A, 6B, 6C, 6D and 6E which are schematic illustrations of a collapsible structure with foldable tab panel having one or more folding line thereacross, according to some embodiments of the present invention.

The collapsible structure 600 contains a first structure panel 601 and a second structure panel 602. Collapsible structure 600 also contains at least two foldable support panels 603, 604 and 605 each connected to first structure panel 601 and second structure panel 602 via two support folding lines at opposite sides of the foldable support panel, such as 611 and 612. Each support panel may be foldable, for example, by using a folding line, such as line 610. Collapsible structure 600 also contains at least one foldable tab panel 606 connected to foldable support panel 603 via a tab folding line 613. Foldable tab panel 606 contains at least one internal folding line 614 parallel to tab folding line 613. Foldable tab panel 606 may also be foldable by line 610, extended from foldable support panel 603.

When collapsible structure 600 is in a collapsed position, as shown at FIG. 6 A, panels 601-606 are adjacent and generally parallel to each other, while foldable support panels 603, 604 and 605 and foldable tab panel 606 are folded. When collapsible structure 600 is in an erected position, as shown at FIG. 6E, foldable support panels 603, 604 and 605 are straightened and foldable tab panel 606 is folded by internal folding line 614 to a shape fixed rod and inserted to support a rigid distance between first structure panel 601 and second structure panel 602.

Reference is now made to FIGs. 7A, 7B, 7C, 7D, 7E, 7F, 7G and 7H which are schematic illustrations of exemplary collapsible structures with foldable tab panel having one or more folding line thereacross, according to some embodiments of the present invention.

The foldable support panels may fold in any way, using any pattern of folding lines. For example, the foldable support panels may fold by three parallel folding lines, as shown at FIG. 7A.

The collapsible structure may have any number of foldable support panels for example, as shown at FIG. 7B. The collapsible structure may have any number of foldable tab panels, such as five, as shown by cross-section illustration at FIG. 7C. The foldable tab panel may have any number of internal folding lines, for example two or three as shown by cross-section illustration at FIG. 7D. The structure panels may have any number of sides, such as five, as shown at FIG. 7E. The structure panels may be parallel or non-parallel, such as shown at FIG. 7F.

Optionally, the structure is made by one sheet of material, as described above. Optionally, some or all of the foldable support panels are connected to the full length of the structure panels to provide more structural strength, for example, as shown at FIG. 7G.

Optionally, the folded tab panel may be used as a step, as it has structural strength. For example, FIG. 7H is a schematic illustration of a collapsible structure where folded tabs 701 and 702 may be used as steps.

Reference is now made to FIG. 8, which is a flowchart schematically representing a method for erecting the collapsible structure of FIG. 6, according to some embodiments of the present invention.

First, as shown at 801, collapsible structure 600 is provided in a collapsed position. In this position, first structure panel 601 and second structure panel 602 are adjacent; and foldable support panels 603, 604 and 605 and foldable tab panel 606 are folded.

Then, as shown at 802, first structure panel 601 and second structure panel 602 are separated. Then, as shown at 803, the distance between first structure panel 601 and second structure panel 602 are separated so foldable support panels 603, 604 and 605 are straightened. This is the maximal distance between first structure panel 601 and second structure panel 602.

Then, as shown at 804, foldable tab panel 606 is folded by internal folding line 614. Also, tab folding line 613 is folded.

Finally, as shown at 805, foldable tab panel 606 is inserted between first structure panel 601 and second structure panel 602 to support a rigid distance between them.

Reference is now made to FIG. 9 A and FIG. 9B, which are a schematic illustrations of an exemplary collapsible cardboard play locomotive structure with foldable tab panels having folding lines thereacross, according to some embodiments of the present invention. The structure is made so a child 901 may climb foldable tab panel 902 as a step. Foldable tab panel 903 is used for structural strength. Foldable tab panels 902 and 903 are rolled into place when erecting the structure, as shown at FIG. 9B. Reference is also made to FIG. 9C which is a schematic illustrations of a process of erecting the collapsible structure of FIG. 9A, according to some embodiments of the present invention. Reference is also made to FIG. 9D, which is a schematic illustration of the spread parts of the collapsible structure of FIG. 9A and its construction, according to some embodiments of the present invention. Optionally, the structure is made by one sheet of material, for example, by plastic injection, as described above. After the construction of the structure, it stays in one piece and may be folded and erected easily.

Reference is now made to FIG. 10, which is a schematic illustration of a collapsible structure with interlocking slit for reinforcement in an erected position, according to some embodiments of the present invention.

The collapsible structure 1000 contains a first structure panel 1001 and a second structure panel 1002 connected to each other via a main folding line 1010. Collapsible structure 1000 also contains a support panel 1003 connected to first structure panel 1001 and to second structure panel 1002 via main folding line 1010, having a slit 1030 at the edge opposite to main folding line 1010. Collapsible structure 1000 also contains a foldable internal panel 1004 connected to first structure panel 1001 via a first internal folding line 1011 and connected to second structure panel 1002 via a second internal folding line 1012. Optionally, collapsible structure 1000 also contains a bottom foldable panel 1005.

When collapsible structure 1000 is in a collapsed position, panels 1001-1004 are adjacent and generally parallel to each other, support panel 1003 and foldable internal panel 1004 are between first structure panel 1001 and second structure panel 1002 and foldable internal panel 1004 is folded.

When collapsible structure 1000 is in an erected position, foldable internal panel 1004 is straightened and inserted inside slit 1030, preventing foldable internal panel 1004 from folding, to support a rigid angle between first structure panel 1001 and second structure panel 1002. Optionally, foldable internal panel 1004 is perpendicular to slit 1030.

Reference is now made to FIGs. 11 A, 11B, 11C, 11D and HE which are schematic illustrations of exemplary collapsible structures with interlocking slit, according to some embodiments of the present invention.

Optionally, the structure panels have one or more folding lines. For example, FIG. 11 A, is a schematic illustration of a collapsible structure with structure panels that have one folding line each, while having structural strength for weigh put on top of the structure.

The foldable internal panel may fold in any way, using any pattern of folding lines. For example, the foldable internal panels may fold by three parallel folding lines, as shown at FIG. 11B. Optionally, the foldable internal panel is made from extensions of the structure panels, for example, as shown at FIG. 11C. Optionally, the internal folding lines are created by attachment of tabs as described above and shown at FIG. 11D. Optionally, the internal folding line is created by attaching an extension of the foldable internal panel to a cut-out part of the structure panel, for example, as shown at FIG. HE.

Reference is now made to FIG. 12, which is a flowchart schematically representing a method for folding the collapsible structure of FIG. 10, according to some embodiments of the present invention. First, as shown at 1201, collapsible structure 600 is provided in an erected position. In this position, foldable internal panel 1004 straightened and inserted inside slit 1030.

Then, as shown at 1202, support panel 1003 is deflected to be adjacent to first structure panel 1001 or to second structure panel 1002. This movement is along the axis of main folding line 1010.

Then, as shown at 1203, foldable internal panel 1004 is folded.

Finally, as shown at 1204, the angle between first structure panel 1001 and second structure panel 1002 is decreased until panels 1001-1004 are adjacent.

Reference is now made to FIG. 13Awhich is a schematic illustration of an exemplary collapsible cardboard play climbing structure with interlocking slit, according to some embodiments of the present invention. The structure is made so a child 1301 may climb the structure. Reference is also made to FIG. 13B which is a schematic illustrations of a process of erecting the collapsible structure of FIG. 13A, according to some embodiments of the present invention. Reference is also made to FIG. 13C, which is a schematic illustration of the spread parts of the collapsible structure of FIG. 13A and its construction, according to some embodiments of the present invention. After the construction of the structure, it stays in one piece and may be folded and erected easily.

The descriptions of the various embodiments of the present invention have been presented for purposes of illustration, but are not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen to best explain the principles of the embodiments, the practical application or technical improvement over technologies found in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

It is expected that during the life of a patent maturing from this application many relevant collapsible structures will be developed and the scope of the term collapsible structure is intended to include all such new technologies a priori. The terms "comprises", "comprising", "includes", "including", "having" and their conjugates mean "including but not limited to". This term encompasses the terms "consisting of" and "consisting essentially of".

The phrase "consisting essentially of" means that the composition or method may include additional ingredients and/or steps, but only if the additional ingredients and/or steps do not materially alter the basic and novel characteristics of the claimed composition or method.

As used herein, the singular form "a", "an" and "the" include plural references unless the context clearly dictates otherwise. For example, the term "a compound" or "at least one compound" may include a plurality of compounds, including mixtures thereof.

The word "exemplary" is used herein to mean "serving as an example, instance or illustration". Any embodiment described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments and/or to exclude the incorporation of features from other embodiments.

The word "optionally" is used herein to mean "is provided in some embodiments and not provided in other embodiments". Any particular embodiment of the invention may include a plurality of "optional" features unless such features conflict.

Throughout this application, various embodiments of this invention may be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.

Whenever a numerical range is indicated herein, it is meant to include any cited numeral (fractional or integral) within the indicated range. The phrases "ranging/ranges between" a first indicate number and a second indicate number and "ranging/ranges from" a first indicate number "to" a second indicate number are used herein interchangeably and are meant to include the first and second indicated numbers and all the fractional and integral numerals therebetween.

It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as suitable in any other described embodiment of the invention. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments, unless the embodiment is inoperative without those elements.

Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.

All publications, patents and patent applications mentioned in this specification are herein incorporated in their entirety by reference into the specification, to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated herein by reference. In addition, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, they should not be construed as necessarily limiting.