Abstract: A skill challenging puzzle game shaped like an space station comprises of three spherical members rotatably mounted on a circular disc-shaped main body. Each spherical member is rotatably mounted on a horizontal axis located at the periphery of the main body and consists of eight equal size sectors. The disc-shaped main body consists of an inverted upper saucer and a lower saucer mounted together and rotatable horizontally relative to each other about a central axis such that the upper portion of the spherical members may be scrambled from or matched with selected lower portion of the spherical members. The matched spherical members may be additionally rotatable relative to their horizontal axes to obtain various challenging combinations of colours or patterns provided on the spherical members.

Abstract: A game device includes a parallelepiped body having six outer shells engaged on six surfaces. The outer shells each includes a tube engaged with the body and each includes four notches formed in the peripheral portion. A number of slides are slidably engaged in the notches of the outer shells and movable between the notches. Six groups of patterns are printed on the outer surfaces of the slides. The users may move the slides of same group of patterns to the notches of an identical outer shell for educational purposes.

Abstract: A paper folding game includes a sheet of paper divided into twelves squares by a number of folding lines and arranged in a three by four matrix. Four groups of patterns are printed on the upper surfaces and the bottom surfaces of the squares. Six cut lines are arranged in the paper sheet so as to allow the paper sheet to be folded to a cubical shape. The four groups each includes six patterns that may be folded to the six outer surfaces of a cube.

Abstract: A game device consisting of a plurality of vertically stacked, alternately rotatable disks (13, 25, 33, 41 and 49) and stationary tiers (10, 19, 29, 37, 45 and 53) each containing passageways through which a spherical game piece may pass. The disks are rotated by players in an effort to cause their respective game pieces to be the first to travel down through the device and drop into the tray (58) at the bottom. Windows (23) ape provided in the tiers so that players may track their progress through the device.

Abstract: A slider puzzle with an assembly of slide members is provided. Each slide member intersects with at least one other slide member at an intersection point and is moveable between two end stop positions or any number of positions in between. Each slide member is also provided with a gate selectively located at each intersection point in accordance with a pre-determined sequence or sequences of moves. The gate either allows or prohibits movement of an intersecting slide member relative to the gate between the two end positions in whole or fractional increments. The object of the slider puzzle is to move all slide members in order that the puzzle is in a solved configuration.

Abstract: The invention relates to a rectangular multi-picture folding puzzle that serves for the amusement of its user. The folding puzzle is composed of a flat base sheet material with a patchwork of partial picture images printed on at least one playing side and additionally subdivided into at least sixteen equal and uniform squares by a combination of score lines and cuts which enable the player to fold square segments into proper juxtaposition to assemble a complete individual picture image.

Abstract: A puzzle has a backing card overlaid with a peel-off sheet. The peel-off sheet has a tacky obverse side which is in intimate contact with a releasable surface of the backing card. The peel-off sheet is cut into segments with each segment bearing a portion of a scrambled image on its face side. Upon removing at least some of the segments and rearranging them on the backing card, the peel-off sheet displays the image unscrambled. The incorporation of the puzzle into a book is also disclosed.

Abstract: A cup/puzzle combination includes a cup including a cylindrical wall with a lower edge, a flange projecting radially from the cylindrical wall thereof, a ridge projecting downwardly from the flange. Two jambs each include a groove defined in a first side edge and a ridge formed on a second side edge. The jambs are attached to the cylindrical wall of the cup. A plurality of slides each include a first groove defined in an upper edge, a first ridge formed on a lower edge, a second groove defined in a first side edge and a second ridge formed on a second edge. A ring includes a groove defined in an upper surface. The ring is attached to the cup. The first ridge formed on a slide is slidably engageable in the first groove defined in another slide. The second ridge formed on a slide is slidably engageable in the second groove defined in another slide. The ridge formed on the flange formed on the cylindrical wall of the cup is slidably engageable in the first grooves defined in the slides.

Abstract: A game of patience including two coaxial mutually facing recesses rotatable about a common axis relative to one another including rings or disks comprising elements mounted therein. At lease one relative position of the rings or disks in relation to one another two opposite rebates jointly define accommodation for a pair of elements having two elements. The pair of elements is rotatable by at least one operating means to transfer the elements respectively into the other ring or disk.

Abstract: A three-dimensional puzzle which consists of several mutually permanently connected puzzle bodies which result in a regular tetrahedron in the assembled state. All puzzle elements consist of truncated pyramids of different sizes which are disk-like. All puzzle elements are combined to a chain, in which each puzzle element is connected with the next-larger one along an edge in such a manner that they can be folded about these edges with respect to one another. In this chain, the individual puzzle elements are arranged such that they form a band which winds helically about an imaginary vertical center axis.

Abstract: A three-dimensional puzzle which consists of several mutually permanently connected puzzle bodies which result in a regular tetrahedron in the assembled condition. In this case, all puzzle bodies are parts of irregular pyramids whose apexes, in the assembled condition, all meet at one point in the interior of the tetrahedron and whose bases form the tetrahedron surfaces in the assembled condition. All puzzle elements are also combined to a chain, specifically such that all puzzle elements, with the exception of the first and the last element, are in each case connected with the adjacent puzzle elements while they can be folded along an edge of the pyramid base.

Abstract: A spherical body includes six surfaces perpendicular with one another, an opening formed in each of the six surfaces, a cap including a shaft for engaging with the opening of each of the six surfaces such that the caps are rotatable about the shafts respectively. A pattern is formed on each of the caps such that various kinds of patterns can be formed among the caps when the caps are rotated relative to the shafts respectively.

Abstract: A completed, solved game puzzle 10 is a mobius strip made of multiple columns 24 and rows 22 of blocks 20, or block-like pieces. Each block 20 has opposing display surfaces and opposing connecting surfaces which are orthogonal to the display surfaces. The connecting surfaces have mechanisms such as a corresponding peg 30 and aperture 32, respectively, for connecting one block 20 to another block 20. The display surfaces exhibit a color, alphabet 28, number or symbol. The unsolved puzzle is one or more bands of blocks connected by and pivotable about an axis 26 extending through the center of each block 20 parallel to the display and connecting surfaces. The solution to the puzzle may be words or phrases spelled by aligned letters of individual strips, or a predetermined pattern formed from aligned colors or symbols. To solve the puzzle, the blocks of each strip must be connected adjacent the blocks of another strip at appropriate locations.

Abstract: A puzzle using two layers of sixteen small, thin, disc type magnets in an upper and lower matrix of 4.times.4 each, whereby the top layer of revolving magnets are colored in two colors at the north and south pole of the magnets, and are horizontally confined to their place, but can turn around showing either one of the colors while the lower layer is confined vertically and whereby each of the magnets can change its position within the lower matrix by a mechanism of sliding bars in x and y direction, thereby maintaining its original north-south direction. This mechanism enables each of the confined individual magnets in the lower layer (matrix) to move around whereby always four magnets in a row are moved one position in the matrix either in x or y direction.

Abstract: A three-dimensional puzzle, which consists of several mutually connected puzzle elements which result in a regular tetrahedron in the assembled state. A number of identical tetrahedron-shaped puzzle elements and a number of mutually identical puzzle elements of different sizes are provided which all have the shape of a closed spatial frame. In this case, the development is such that the inner sides of the legs of the frame-shaped elements are identical to the outer sides of the frame legs of each of the next-smaller elements or to the surfaces of the smallest tetrahedron-shaped elements. All elements are in each case connected with one another along one of their edges, specifically such that they can be folded and can be pulled apart a distance at least on one end. In this case, the elements are arranged such that they form a number of chains which have different lengths, are each placed against one another with their largest element and consist of puzzle elements which all have different sizes.

Abstract: A folding puzzle is made of 4N identical block elements of three-dimensional right triangular form. The two right-angle sides of each block element are connected by hinge elements to the correspondingly matching right-angle sides of preceeding and succeeding block elements, such that the block elements are connected in a series. The hinge elements provide folding lines at one side of the block elements to allow adjacent block elements to be folded overlying each other. The series of block elements may be connected in a closed loop, with a continuous tape layer applied over the inner plane surfaces of the block elements for structural stability. The hinge elements may be flexible tape elements, leaf or extruded tab-type hinges, or detachable hinges which allow a closed loop to be opened or to be joined with other series of block elements.

Abstract: A puzzle in the form of a flat, circular plate is composed of a plurality of concentric rings, wherein each ring contains numerals, symbols or parts of pictures on its front and on its rear surface. These have to be arranged in a given order on the plate by rotation and/or reversal of each ring. In the case of pictures the parts on each ring have to be assembled to form one or more complete pictures, and in the case of numerals into a given arrangement or sequence of figures. Each ring is provided with a circumferential groove and with protruding knobs engaging with the groove of the adjoining ring whereby the rings are maintained in a common plane of the circular plate.

Abstract: The intention of the present invention is realized by a logical mosaic-puzzle, which is built-up of a given number of elements, where between the two main elements, the casing and the clamping frame there are mosaic toy-elements connected to each other loosely. The toy-elements are formed in such a manner that they can be turned on circles extending into or overlapping each other, about the axis of the circles and simultaneously compared to the other circles. Moreover the circles each consist of 6 toy-elements, out of which one toy-element forms the part of three different circles while the other circles are also formed of 6 toy-elements each, which can be ranged into two different groups, and which toy-elements are provided with projections joining each other, the casing and the clamping-frame; and with grooves taking up these projections. The number of the toy-elements can 13, 16 or 19.

Abstract: A game device including a cubic body having six circular surfaces tangent with one another, a block rotatably engaged on each of the circular surfaces and each having a number of gaps formed in the peripheral edge, a shell engaged on each of the blocks and including a number of slots aligned with the gaps of the block, and a slide engaged in each of the slots. One of the slots is left blank such that the slide of one shell can be pushed into the blank when this slide is aligned with the blank.

Abstract: A polyhedron with indicia carrying sections, for example a cube. The polyhedron is comprised of a first plurality of first larger sections, e.g. two halves of the cube, and the two larger sections are hinged together along neighboring edges. Their abutting, opposed surfaces, are hidden from view. When the larger sections are opened apart, this exposes indicia, e.g. a fraction, indicative of the portion of the whole polyhedron which each fractional larger sections comprises. Each of the larger sections of the polyhedron, e.g. a cube, are in turn openable apart around hinges to define smaller sections of the larger section. Surfaces of the hinged together smaller sections, which are hidden from view when the smaller sections are assembled, are exposed to view when the smaller sections are opened apart to define still smaller sections. Those indicia are related to the size of the smaller sections and, e.g., recite the fraction of the whole polyhedron which those smaller sections comprise.

Abstract: An image transformation puzzle comprising a series of elements with image portions on respective front faces thereof successively linked together for incremental translational and rotational movement around a closed loop path between different positions in which image portions of different elements combine to form different composite images. Image portions of successive elements combine in one of the different positions to reduce the total number of composite images in that position producing a vanishing image effect. The elements may be formed as solid profiles of the image portions.

Abstract: This invention concerns a "puzzle" whose pieces consist of a plastic colored bracket which hooks to identical brackets to form a chain, which is then placed adjacent to other chains of the same shape to form a screen on which any drawing representing the result of a pre-established assembly order of the various multi-colored brackets can be reproduced.

Abstract: A puzzle toy has manually-turnable actuators for transferring toy elements from one pocket to another until a desired puzzle solution is obtained.

Abstract: A maze puzzle has a plurality of separate discs mounted to be independently rotated about a common shaft, which discs each have a plurality of openings by means of which a ball can pass through the discs from the disc through which it entered to the exit opening at the other end of the puzzle. Some of the openings are radially inclined to transfer the ball radially as well as axially and the hole pattern is so designed that the ball must travel axially back and forth between the top and bottom of the puzzle before it can reach the exit opening.

Abstract: A domino game is provided wherein some of the domino pieces have rotatable or convertible end sections that thus permit player a choice as the symbol to be displayed when the game piece is played. Symbols are displayed on both sides of each game piece, and the game pieces having rotatable or convertible ends can be changed to display alternative symbols, thereby adding to the challenge and complexity of the game. Preferably, the symbols comprise representations of U.S. or foreign currency or coins, with each game piece displaying both the front and back of at least one denomination. In one embodiment, the convertible game pieces comprise relatively rotatable sections. In an alternative embodiment, the game pieces have end sections that may be pivoted or flipped over, rather than rotated, to display different symbols. In another embodiment, each game piece comprises two separate sections which may be mated together in various orientations.

Abstract: A self-contained loop puzzle has a plurality of closely spaced casements, selected casements being rotatable around their longitudinal axes of symmetry. Selected casements contain an indicia bearing tile and a second indicia bearing tile in spaced relationship such that the plurality of casements presents a series of tiles in a given order, and at least two spaced tracks are defined by the closely spaced casements in the loop. The tiles are slidably in the respective tracks, whereby selective, partial rotation of casements and the sliding movement of tiles along the loop produces a reverse order for the series of tiles.

Abstract: The present invention is directed to a puzzle having nine virtually identical interconnected members contained within a casing. The members are interconnected through toothed gears which are accessible from the exterior of the casing. Each of the nine members and the top surface of the casing has colored dots arranged in an array. To solve the puzzle matching pairs of dots must be aligned with each other and with the dots arranged around the periphery of the surface of the puzzle. The puzzle is both challenging and entertaining and will provide the user with hours of entertainment.

Abstract: The three-dimensional puzzle extends over the side surfaces of an upright prism having a polygonal base surface. The puzzle is composed of at least two parts (A, B) which are coaxially rotatable (a) relative to each other. The rotation (a) can be manually performed in both directions and each corresponding position of the side faces is marked by a locking engagement between the two parts (A, B). Plaques (1) are slidably (v, h) disposed in a vertical double row on each side face. These plaques (1) cover the full side face. These plaques (1) exhibit on their back side elastic wings (1a) extending and protruding from a connection pin (1b) disposed in the center of the plaque (1). The plaques (1) are slidable at the side faces of the prism in a vertical direction (v) and/or horizontal direction (h) and are held in position with the elastic wings (1a) guided in guide grooves (2). The plaques (1) and elastic wings (1a) are slidable to that side face of the prism which exhibits an empty position (100).

Abstract: A folding device for use as a toy, puzzle, game and the like is formed by a series of like components. Each component comprises a pair of mirror-image segments, hinged together along a common edge and essentially forming a truncated triangle. A series of these truncated triangles are hinged together in a series to permit the unit to be folded in a variety of arrangements.

Abstract: A rotating amusement device having two or more overlapping circle members which are independently rotatable with the overlapping sections being rotatable into the bodies of any or all of the overlapping circles or into a different overlapping of circles. The device can be utilized as a puzzle wherein various possible overlapping sections are differently colored or shaped and the object is to obtain a predetermined color combination or shape configuration. The circle members are comprised of interlocking elements with a peripheral frame holding the circles in such interlocking position while permitting the independent rotation of each of the circles. Increase in the number of overlapping circles adds to the complexity by increasing the number of possible permutations.

Abstract: A puzzle comprises a strip of flexible sheet material formed into a closed loop having twists to define two (or more) Moebius rings manually juxtapositionable with respect to each other. The strip is transparent and includes opaque markings which are viewable through the two rings of the transparent strip to define a predetermined pattern, representing a correct solution of the puzzle, only when the two Moebius rings are located in a predetermined juxtaposition with respect to each other.

Abstract: A learning aid for children comprising a plurality of auxiliary charts each having a plurality of contents for learning easy addition or subtraction by means of memorizing one content by one person (teacher) and asking questions by another person (learner). The answers by the teacher cause the lerner to add or subtract according to designated numerals of said charts, thereby leading to the content memorized. A main chart, showing sheets or a numeral sheet may also be used.

Abstract: A manipulative amusement device that includes upper and lower plates parallel to and in coaxial alignment with and rotatable relative to each other, each plate having a pair of spaced collar pieces disposed on opposite sides of a plurality of openings disposed in the periphery thereof to define a plurality of coaxially disposed spaced pairs of collar members, and a plurality of cylinder assemblies each formed about a respective longitudinal axis and comprised of an even number of cylinder segments with each cylinder assembly having opposing ends adapted for being rotatably received by the pair of spaced coaxially aligned collar members for permitting rotation of the cylinder assemblies.

Abstract: The invention provides an amusement and display device comprising at least eight distinct elements each of the elements being of regular prismatic shape and having sides, edges and corners wherein each of the elements is interconnected to an adjacent element by flexible joining means provided along an edge thereof, at least two adjacent elements and least one of the elements being connected along three separate edges to three adjacent elements, characterized in that the elements are cubical prisms formed by interfitting two identical units of U-shaped profile mutually angularly offset by 90.degree.

Abstract: A mechanical puzzle has a three by three array four gear units at the corners and five split gears. Opposed faces of the gear units and split gears are visible through a transparent casing and apertures in the chassis. The gear units are selectively connected to the split gear halves by axially setting four selector gears by finger pressure on their stubs. Clock faces are marked round the apertures and the puzzle consists in turning the gear units by finger pressure and setting the selector gears so that pointers on the eighteen exposed faces tell the same time.

Abstract: A puzzle comprises a plurality of puzzle elements held together along a common axis. Each of the puzzle elements includes first and second faces and a peripheral edge. A series of discrete symbols are formed along the peripheral edge of each element. Preferably, the puzzle elements are magnetic wheels held together by magnetic forces. The magnetic wheels have a series of protuberances on one face which are adapted to register with a series of cavities on an opposing face of an adjacent magnetic wheel. The magnetic wheels are rotated relative to each through a series of click-stops which correspond to discrete positions of the magnetic wheels. A solution is achieved when all of the symbols on each of the magnetic wheels are properly aligned.

Abstract: A two player game provides an assembly of components in modifiable form by the rotation and sliding of two handles, the handles being separated by a series of spaced individually rotatable game rings, each ring being covered with a unique pattern of selected indicia about its circumference. Means controlled by the handles permit the players to rotate selected rings to align selected indicia on adjacent rings. Spacer rings rigidly affixed to a center shaft separate the game rings and have structure interlocking them to each other within the neighboring game rings. The game rings having inwardly facing teeth which can be selectively actuated by a tab on the end of a handle extension when the handle is rotated. A series of cooperating spring clips held by portions of the spacer rings in engagement with and beneath said teeth, yieldingly resist turning of the game ring by the tab and a keyway in the handle guard limits rotation of the handle extension at each play to turn the game wheel only one step at a time.

Abstract: A puzzle-type amusement device comprises a stack of rotatable discs formed with two openings adapted to be aligned with each other; and a ball receivable through one of the openings in the top disc so as to pass through the openings aligned therewith in the intermediate discs to rest against the bottom disc. One opening in each intermediate diswc is bounded at one side by a tapered surface curved about the axis of rotation of the disc so as to constitute an inclined tract permitting the ball, when received in such opening, to be rolled along the inclined track out of the respective opening in the direction towards the top disc. The other opening in each intermediate disc is bounded on all its sides by an untapered surface such that the opening constitutes a trap preventing the ball, when received in such opening, from being rolled out of the opening in the direction towards the top disc.

Abstract: This puzzle device is constructed for recreation, amusement and educational purposes. Primarily, it consists of a multiple number of tubes that are joined together by a cord that is exposed at the ends of the tubes to serve as hinges for manipulating the device to form various geometric shapes, such as, a cube, a square, a hexagonal form, a rectangle, a four sided pyramid, a three sided pyramid, etc.

Abstract: A three-dimensional structure defines space in the form of a tetrahedron as the simplest of the five Platonic solids with junction restraints at each of four vertices that allow lineation of size and angulation of shape and form by flexure and frictional slippage, respectively. This structure has use as an educational toy, puzzle, or game; in miniature as jewelry and pendants or support for variable requirements of easels or tables or display racks.

Abstract: A game wheel comprising a support base, a plurality of identical rollers radially arranged and rotatably resting on the support base, and an observation wheel with observation slots. The surface of each roller is divided into several regions marked with different digits, letters or colors, respectively. The observation wheel is provided with several one-way turning protrusions on the bottom face so as to turn the rollers contacting the protrusions when the observation wheel is turned in a clockwise (CW) direction. Conversely, counterclockwise (CCW) rotation of the observation wheel will not turn the rollers. Indicating marks set on the upper face of the observation wheel indicate the positions of the turning protrusions. By CW and CCW rotation of the observation wheel, a user may arrange the randomly arrayed digits, letters or colors of the rollers into a uniform or predetermined pattern.

Abstract: A ballpoint pen which does not require use of a separate cap member is constituted in the form of a linkage of four levers which form a holder. At least one of the four levers is formed to be hollow so as to receive a writing element therein; and the front portion of said writing element projects out of the end of one part of a given connected piece of one of four connecting bodies firmly fitted into an opening portion of each end of the four levers. A concave portion is provided in a second part of the given connected piece for receiving the front portion of said writing element when the ballpoint pen is in closed pen condition. The tip of each lever is joined to the tip of an adjacent lever by a hinge element.

Abstract: Puzzles are comprised of linked loops, where the loops are made by first making flat strips of equilateral triangles by hinging the triangles together at their edges and then folding the strips at the hinges and then connecting the end triangles together to form a twisted loop that has the overall form of a flattened hexagon known in the literature of recreational mathematics as a hexaflexagon. The linked loops are linked hexaflexagons and the loops can be shifted and folded into many different 2 and three dimensional positions with respect to the loops they are linked to. The resulting linked loop puzzles have been now named as slipagons since they can be shifted by sliding loops with respect to the loops they are linked to as well as by folding. The loops can be linked in many ways to form puzzles of greatly varying difficulty where the object of the puzzle can be to get from one shifted geometric form to another or to get a figure drawn on the loops of the puzzle into some given arrangement.

Abstract: A competitive disk rotating game device designed to employ several different forms of play into one fast paced two player unit and consist of a series of multi-colored and uniquely patterned disks which are rotated to the left and right by the interactive pushing, pulling, and rotation of each player's handle, one at each end of the rotating disks.

Abstract: An amusement device for use in providing a manipulative puzzle, word games, games of chance, scoring games, or the like. Upper and lower parallel plates are planarly rotatable about a vertical axis. A plurality of cylinder assemblies is carried by the plates disposed on the outer periphery such that their longitudinal axes intersect to define a regular polygon parallel to the plates. Means are provided for maintaining spatial position of the upper one-half of each cylinder assembly relative to the upper plate, and the lower one-half of each cylinder assembly relative to the lower plate as the plates are rotated in opposing directions. When the plates are rotated such that the upper and lower cylinder halves combine to define the cylinder assemblies, each such assembly is further rotatable about its longitudinal axis. Each cylinder is comprised of sections each preferably having an identifier on its outer surface such as a different color or the like.

Abstract: An array of plate-like elements is retained by endless filaments looped on the elements to form migrating hinges between individual elements and other elements adjoining same. Grooves are formed in the surfaces of each plate, the grooves being in two groups, with the members of each group being mutually parallel, and the grooves of each surface being in overlying registration. The filaments lie within the grooves in a selected pattern, with filaments forming anchor points at plate sides at which the filament wraps around the side of the plate to enter a groove from the other group of grooves on the opposite side of the plate, and hinge points at plate sides where the filament passes from one plate to an abutting plate, proceeding from one surface to the opposite surface in doing so. Manipulation of the resulting array allows two such plates to rotate mutually about an axis defined by hinge points lying on their abutting sides.

Abstract: A composite array consists of plate-like elements or solid bodies interconnected by endless filaments. The front and rear surfaces of each element are provided with grooves, the grooves being divided in two groups, with grooves of each group running parallel with one another. The filaments lie within the grooves and are not attached to the elements. The filaments are arranged upon the elements so that each filament, upon reaching a lateral side of an element, is led into a groove on the opposite surface of the array. If the lateral side lies at the outmost edge of the array, the grooves are of different direction, while at lateral sides forming a line of contact, the grooves run in the same direction. On one or both surfaces of the elements, markings, numbers, letters, text or pattern elements may be found, for differentiating and determining the elements' positions.

Abstract: A type of labyrinth puzzle comprising a variable path labyrinth comprising first and second labyrinth defining portions which are movable with respect to each other.

Abstract: A puzzle-type game comprises at least five manipulatable members, for example of square or circular cross-section, each formed at one end with fingers, and at the opposite end with a circular recess, such that a plurality of the members may be assembled by the player according to any desired sequence, and to be rotated to any desired angular position with respect to each other. Each member carries on its outer faces indicia representing one element of a valid multi-element relationship produced only when the indicia of all the members are aligned according to a predetermined sequence and a predetermined angular position. In one described example, the indicia represent arithmetical equations, and in other described examples they represent the letters of the alphabet, and a maze.

Abstract: The disclosure relates to a construction panel system for the erection of doll and play houses, mazes, etc., and comprises a series of connected rectangular panels of approximately the same size connected together so that each panel can be rotated with respect to an adjacent panel but at least two of said panels are connected to adjacent panels by double hinges of the Jacobs ladder type so that they can be rotated in two directions with respect to adjacent panels and at least one additional panel is connected to the Jacobs ladder type so that it can be rotated in two directions with respect to said adjacent panel and at least one additional panel as connected to the Jacobs ladder panels by a hinge having its axis at right angles to the Jacobs ladder hinge. The panels are provided with holes adjacent the corners thereof and a fastening and reinforcing means is provided for holding non-connected panels together.