Interference joint digit, building element, building system, and assembly

Abstract

Toys, building sets, and toy assemblies are provided that include at least one digit or digit toy. Each digit toy includes a first segment and a second segment connected by a joint having a living hinge. As the joint transitions between a first state (e.g., an extended state) and a second state (e.g., a flexed state), an interference member of the joint interferes. The first segment and the second segment each optionally include a first retaining feature disposed on their same first side, and the first retaining feature reversibly stabilizes the first segment to the second segment in the second state.

Description

Technical Field

[0001] (Cross - Reference to Related Applications) This application claims the benefit of U.S. Provisional Patent Application No. 63 / 354,187, filed on Jun. 21, 2022, the entire disclosure of which is incorporated herein by reference.

[0002] (Field of the Invention) The present disclosure relates to the field of toys.

Background Art

[0003] As a foldable structure, for example, there is the Hoberman sphere described in U.S. Patent Application Publication No. 2002 / 0083676 (A1). The Hoberman sphere is a constant - velocity structure with joined links. The scissor - like joints connecting the links allow the spherical structure to be easily expanded and contracted by pulling the structure outward or pushing it inward, respectively. A user can operate the Hoberman sphere along a continuum between an expanded configuration and a contracted configuration. However, the Hoberman sphere is limited to a single degree of freedom because all joints within the Hoberman sphere need to be moved when the sphere transitions between states.

[0004] There is a need for toys that can be assembled into reconfigurable assemblies having more degrees of freedom and additional interesting characteristics.

Summary of the Invention

[0005] The present disclosure provides toys including building elements, building sets, and assemblies. A fidget is referred to herein as a "digital toy" or simply "digital" (alternatively, "link"), and the category of "building element" includes both digital links and "hubs". The building elements are provided individually or as a building set (a kit of building elements) and can be assembled into a toy assembly to provide numerous advantages over known structures.

[0006] In contrast to the Hoberman sphere, the toy assembly of the assembled building elements of the present disclosure has a number of degrees of freedom. That is, the user can operate the building elements independently. More specifically, each digit or link can be individually shifted between at least a fully open configuration (i.e., a first state in which the joints of the link are aligned longitudinally), a fully closed configuration (i.e., a second state in which the segments of the digit are substantially parallel), and an intermediate configuration between the fully open configuration and the fully closed configuration. The digits provided in the present disclosure can also be inverted and / or shifted from the fully open configuration, through a second intermediate configuration, to a second closed configuration.

[0007] Furthermore, the optional interference joint of each digit stabilizes the digit in the first state (longitudinally aligned state) and generates an audible response and / or a tactile response of an interesting "snap" or "pop" when operating between the first state and the second state.

[0008] The assembly of digits and hubs described herein has a number of degrees of freedom and can achieve different configurations that cannot be achieved by known systems. As an example, an assembly including six digits, such as the assembly 2400 of FIGS. 24A and 24B described below, results in more than 1,458 different configurations. An assembly including twelve digits (such as the assembly 1900 of FIGS. 19A - 19D) can be arranged in 531,441 possible configurations. Inevitably, due to the more complex structures having a greater number of digits, the number of configurations continues to increase exponentially. As a result, when compared to conventional structures such as the Hoberman sphere, the implementations of the present disclosure offer a wider range of uses and a considerably higher playability.

[0009] In one aspect, the present disclosure describes building elements, referred to as "digits", configured to provide a tactile snap or pop response to being bent into different configurations. Such digits individually provide interest, and optionally other digits and / or other building elements (e.g., "hubs") are provided to form a building set that includes digits and at least one other building element (such as another digit or hub). Further, the digits can be coupled to other digits and / or other building elements (including hubs) to create assemblies having numerous interesting characteristics. In certain implementations, one or more digits can be fixed to other building elements to form a complete three-dimensional assembly. In other implementations, the digits, hubs, and other components can be provided as a building set of disassembled building elements, partially assembled assemblies (e.g., grids), or fully assembled assemblies, and the user can assemble them or reassemble them into different assemblies. The present disclosure provides various non-limiting examples of digits, hubs, and related assemblies.

[0010] In addition to being a means for creative play, the digits according to the present disclosure are also sensory "fidgets", particularly due to the tactile snap / pop responses they generate. Fidgets assist in improving attention, interest in tasks, and self-control by allowing the brain to filter out excess sensory information, thereby enabling a wide range of uses for both children and adults. For example, fidgets often improve listening skills in classroom settings, enhance concentration during business meetings, and reduce anxiety and stress.

[0011] In one aspect, the present disclosure provides a digit or digit toy comprising a first segment and a second segment, each connected by a joint optionally provided with a living hinge, wherein when the joint transitions between a first state and a second state, an interference member of the joint interferes. Optionally, the first segment and the second segment each comprise a first retaining feature disposed on their same first side, and the first retaining feature reversibly retains the first segment to the second segment in the second state.

[0012] In another aspect, the present disclosure provides a toy (e.g., a fidget toy) comprising an assembly including a plurality of hubs coupled to a plurality of digits, each digit comprising a first segment and a second segment, each connected by a joint optionally provided with a living hinge, wherein when the joint transitions between a first state and a second state, an interference member of the joint interferes. Optionally, the first segment and the second segment each comprise a first retaining feature disposed on their same first side, and the first retaining feature reversibly retains the first segment to the second segment in the second state, and the assembly includes two or more independent degrees of freedom.

[0013] In another aspect, the present disclosure provides a toy (e.g., a fidget toy) comprising an assembly including a plurality of hubs coupled to a plurality of digits, each digit comprising a first segment and a second segment, each connected by a joint optionally provided with a living hinge, wherein when the joint transitions between a first state and a second state, an interference member of the joint interferes. Optionally, the first segment and the second segment each comprise a first retaining feature disposed on their same first side, and the first retaining feature reversibly retains the first segment to the second segment in the second state. Optionally, the assembly is configurable between a plurality of stable closed configurations and a plurality of unstable closed configurations.

[0014] In another aspect, the present disclosure provides a building set including a digit having a first segment and a second segment connected by a joint optionally provided with a living hinge, wherein when the joint transitions between a first state and a second state, an interference member of the joint interferes. Optionally, the first segment and the second segment each include a first retaining feature disposed on their same first side, and the first retaining feature reversibly retains the first segment to the second segment in the second state. The first segment and the second segment each include a hub coupling feature disposed at their distal ends and a hub defining a plurality of digit coupling features disposed around the body, and the hub coupling feature reversibly connects to the digit coupling feature.

[0015] The following features may be incorporated in any combination into any of the foregoing aspects.

[0016] In any embodiment, the interference member includes interlocking ends of the first segment and the second segment.

[0017] In any embodiment, the interlocking ends define a socket and a protrusion.

[0018] In any embodiment, the interference member includes a plurality of links, each link extending from an end of the first segment or the second segment.

[0019] In any embodiment, the interference member interferes when the joint is in the first state.

[0020] In any embodiment, in the first state, the first segment and the second segment are longitudinally aligned, and in the second state, the first segment and the second segment are out of longitudinal alignment.

[0021] In any embodiment, at least one of the interference members is flexible.

[0022] In any embodiment, when the joint transitions from an interference state, the interference member is released from the interference.

[0023] In any embodiment, when the first segment and the second segment form an interior angle below a bending threshold, the interference member is released from the interference.

[0024] In any embodiment, the interference member is deformed and released.

[0025] In any embodiment, the release of the interference member generates an audible pop response.

[0026] In any embodiment, the release of the interference member generates a tactile pop response.

[0027] In any embodiment, the living hinge is offset from the central plane of at least one of the first segment or the second segment.

[0028] In any embodiment, the first segment and the second segment each comprise a second retaining feature disposed on their same second side surface, the second retaining feature being configured to reversibly retain the first segment to the second segment.

[0029] In any embodiment, the first segment and the second segment each comprise a coupling feature formed as a protrusion or a recess disposed at their distal ends.

[0030] In any embodiment, the digit further comprises a third segment connected to the second segment by a second joint, the second interference member of the second joint being configured to interfere when the second joint transitions between a first state and a second state.

[0031] In any embodiment, in each of the stable closed configurations, the plurality of digits are stable in the first state or the second state.

[0032] In any embodiment, in each of the unstable closed configurations, at least one of the plurality of digits is free to bend about the joint.

[0033] In any embodiment, the toy is configured to be turned inside out without decoupling any of the digits from the hub.

[0034] In any embodiment, the digits and the hub form a lattice and the hub coupling features and the digit coupling features are coupled together.

[0035] In any embodiment, the hub coupling features and the digit coupling features comprise complementary structures including slots and tabs, or ball joints and sockets.

[0036] Additional advantages will become apparent from the following description.

Brief Description of the Drawings

[0037] To readily identify discussion of any particular element or action, one or more of the leading digits of the reference numbers refer to the drawing number in which that element was first introduced.

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DETAILED DESCRIPTION OF THE INVENTION

[0038] Figures 1A and 1B show one exemplary building element of the present disclosure, referred to herein as a digit toy or digit 102. The digit 102 is configured to function with multiple capabilities. First, the digit 102 alone is a fidget or toy. Second, the digit 102 can be a building element of a building set (i.e., a kit of two or more building elements). Third, the digit 102 can be a link of an assembly of building elements (i.e., a link of fidget toys). The term "digit" is used herein to describe a structure suitable for all such purposes.

[0039] The digit 102 includes a first segment 104, a second segment 106, and a joint 108 disposed between the first segment 104 and the second segment 106. The joint 108 extends between the first segment 104 and the second segment 106 and includes a hinge 110 that couples these segments. The joint 108 further includes an end 112 of the first segment 104 and an end 114 of the second segment 106. The joint 108 is an "interference joint" as described below. However, other embodiments of the building elements of the present disclosure utilize non-interference joints. See, for example, FIGS. 6A-6D. In FIG. 1A, the hinge 110 is a living hinge formed by two bridge strips 132a, 132b of material connecting the ends 112, 114. The strips 132a, 132b are also offset from the longitudinal centerline 130, thus allowing the joint 108 to bend more easily in one direction (i.e., from a first state to a second state). In other embodiments, the hinge 110 can have a structure other than a living hinge, such as an internal hinge sandwiched between two halves of the digit as described in International Patent Publication No. 2021 / 061868 to Hoenigschmid, which is hereby incorporated by reference in its entirety. In some embodiments, the hinge 110 is integrally formed with the interference member of the joint 108 described below.

[0040] In use, the user can move digit 102 between various states by bending digit 102 at joint 108. This disclosure generally discusses the transition of a digit between a first state and a second state. The first state and the second state can be characterized by the position of joint 108 and / or the relative positions of segments 104, 106.

[0041] In some embodiments, the first segment and the second segment have different relative alignments in each of the first state and the second state. In some embodiments, the first state is an extended state (see FIG. 1A), and the second state is a bent state (see FIGS. 2C and 2D), and these states can be confirmed with reference to joint 108 alone or with reference to segments 104, 106. In certain embodiments, the first state may correspond to a state in which the first segment 104 and the second segment 106 are longitudinally aligned (as shown, for example, in FIGS. 1A - 2B), and the second state may correspond to a state in which the first segment 104 and the second segment 106 are out of longitudinal alignment and are not substantially parallel to each other (as illustrated, for example, using various exemplary digits in FIGS. 2C - 2D).

[0042] For ease of understanding, the first state is often referred to herein as the "longitudinally aligned state" or "extended state" in which the first segment and the second segment are longitudinally aligned, while the second state is referred to as the "bent state" or "parallel segment state" in which the first segment and the second segment are substantially parallel. However, the principles and concepts disclosed herein can be readily adapted to embodiments in which the segments are angled (i.e., oblique or perpendicular) to each other in one or both of the first and second states.

[0043] When digit 102 transitions between the first state and the second state, the interference members of joint 108 interfere with each other in an "interference state" through the interference range of motion, deform (in some embodiments), and are then released when beyond the interference range (i.e., pass by each other, substantially reducing friction or resistance, or alternatively, disengaging, or significantly reducing interference). As described below, the interference state is a stable state resulting from mechanical, magnetic, or other interference between the interference members. In other words, "interference" means, for example, rubbing against magnetic repulsion or attraction, interlocking, rotating, or otherwise resisting the relative bending of the joint. If any digit described herein is not in an interference state, or the segments are not joined together by a retaining feature or otherwise in another stable state, the segments are in a free state or a relaxed state where the digit generally rotates freely about the joint with minimal or nominal resistance, excluding any biasing exerted by hinge 110 or the manufacturing process.

[0044] The range of motion in which the interference members interfere is referred to as the interference range of the interference state, which can at least partially coincide with the first state (extended state) and the second state (bent state) as described above. In some embodiments, such as digit 102 in FIGS. 1A and 1B, the interference state at least partially overlaps the first state (rather than the second state), and in such embodiments, the interference members interfere when the segments are in a longitudinally aligned state. In some embodiments, the interference state exists between the first state and the second state (e.g., completely between them), and in such embodiments, the interference members do not interfere when the segments are in a longitudinally aligned state. In some embodiments, the interference state at least partially overlaps the second state (rather than the first state), and in such embodiments, the interference members interfere when the segments are in a parallel segment state.

[0045] Referring to the interior angle formed by the segments of a digit (see, e.g., FIG. 2C), the interference range can be from about 1 to 30 degrees, such as from about 1 to 20 degrees, from about 1 to 10 degrees, from about 10 to 30 degrees, or from about 10 to 20 degrees. In other words, the interference member continues to interfere until segments 104, 106 form an interior angle that is less than about 150 to 180 degrees (e.g., from about 150 to 170 degrees, from about 150 to 160 degrees, from about 160 to 180 degrees, or from about 170 to 180 degrees). When segments 104, 106 form an interior angle below this bending threshold, the interference member is rapidly released, and then digit 102 can be bent to the second state with significantly less resistance.

[0046] In some embodiments, the release of the interference member from the interference state generates a tactile and / or audible "snap" or "pop" response from joint 108. The snap or pop response adds an interesting sensory feedback to facilitate play. The degree to which end 112 interferes with end 114 in the interference state and the resulting nature of the snap / pop response are functions of the material selection and the geometry of ends 112, 114. For example, materials and interference members with higher rigidity configured to interfere to a relatively high degree (e.g., due to shape and / or tighter tolerances) generate a more prominent snap / pop response than materials and / or interference member shapes configured to interfere minimally and / or have relatively high flexibility. Joint 108 can be configured to generate a snap or pop response in a single direction (i.e., when the digit is actuated from the first state to the second state or vice versa) or in both directions.

[0047] Referring to FIG. 1B, in digit 102, the interference member includes locking ends 112, 114, which can be flexible or otherwise configured to deform when the interference member interferes. More specifically, locking ends 112, 114 each include a socket 116 and a protrusion 118, which interfere with each other in the first state (longitudinally aligned or extended state) to stabilize digit 102 in that state.

[0048] In some embodiments, such as digit 102 of FIG. 1A, interference members 116, 118 interfere with each other in both directions (i.e., when digit 102 transitions from a first state to a second state and vice versa). In other embodiments, the interference members interfere with each other in a single direction, i.e., when digit 102 transitions from a first state to a second state or vice versa.

[0049] As discussed in more detail below, digit 102 can be at least partially formed from a flexible material such that when a user applies sufficient bending force to digit 102 while ends 112 and 114 are interfering with each other (i.e., in an interfering state), ends 112 and / or 114 undergo sufficient deformation (i.e., slip past or otherwise significantly reduce the interference) such that ends 112, 114 are released, allowing further transition of digit 102 to a first or second state. In some embodiments, digit 102 is a one-piece device formed from a single material (e.g., injection molded TPU). In other embodiments, the interference members are formed from a different material than the segments, e.g., digit 102 can be co-molded with two or more materials.

[0050] Referring now to FIGS. 1C-1F, one exemplary interference member configuration is described. Digit 102 provides a first example of an interlocking interference member configuration where, for example, when digit 102 is in a first state, end 112 defines a claw, jaw, or socket 116 that receives projection 118 of end 114. In digit 102, projection 118 has a "T" shape, a mushroom shape, or a shape on a bulb. Socket 116 has a "C" or claw shape that defines a cavity that receives projection 118 and extends partially around it when digit 102 is in a first state.

[0051] Referring briefly to FIG. 1E, socket 116 interferes with projection 118 when digit 102 transitions from the first state to the second state or vice versa (e.g., by bending from the first state in direction 120 about joint 108 and from the second state in direction 122 about joint 108). In particular, socket 116 resists release of projection 118 by gripping projection 118 as shown in FIGS. 1C - 1D until sufficient bending force is applied to segments 104, 106 to temporarily deform or yield socket 116 and snap projection 118 therewith (generating an audible response and a tactile response).

[0052] As most clearly shown in FIG. 1E, projection 118 has a partial depth or thickness relative to the depth of segments 104, 106. In particular, projection 118 has a depth that extends to centerline 130 of digit 102. The depth of projection 118 can be increased or decreased in different embodiments to modulate the snap response or pop response. For example, in some embodiments, projection 118 can have a depth that extends beyond centerline 130, e.g., to the full depth or full thickness of segments 104, 106, and such embodiments produce a more pronounced pop response or snap response. On the other hand, in some embodiments, projection 118 has a shallower depth, e.g., less than half the depth or thickness of segments 104, 106, and such embodiments produce a less pronounced pop response or snap response.

[0053] Returning briefly to FIG. 1A, projection 118 has an optional radius formed around its outer periphery on the first joint surface 148 and hinge 110, which facilitates movement of digit 102 to the first state. As shown in FIG. 1B, projection 118 does not have any similar radius formed on the side facing the second joint surface 150 or away from hinge 110. However, other embodiments may include radii on both sides.

[0054] Referring back to FIG. 1B, joint 108 can be configured to prevent over-extension, for example beyond full extension. For example, hinge 110 is offset from centerline 130 or a central plane, which causes ends 112, 114 to abut when the digit bends in a direction opposite from the first state to the second state, thus preventing over-extension. In other words, when segments 104, 106 are longitudinally aligned, they define a longitudinal axis (parallel to centerline 130), and hinge 110 is offset from the longitudinal axis.

[0055] The interference member can have a number of additional different configurations. In other embodiments, the locking end portions include one or more pairs of tongues and grooves, hooks and loops, balls and sockets, parallel bosses, cams, cams and followers, or similar structures that mechanically engage each other and then release as the digit transitions between the first and second states. In still other embodiments, the interference member can include two or more magnets embedded in the distal ends of segments 104, 106. The magnets can have the same or opposite polarities. In such embodiments where the magnets have the same polarity, the magnets magnetically interfere by repelling each other within the interference range. In such embodiments where the magnets have opposite polarities, the magnets magnetically interfere by attracting each other within the interference range and resisting bending of digit 102.

[0056] In still other embodiments, the digit includes a single interference member in the form of a strip of spring steel or similar material that is biased toward the second state, similar to the tape of a tape measure. The strip extends between end 112 of segment 104 and end 114 of segment 106. The strip is curved along its width (shorter dimension) and is concave when extended. This curvature allows the strip to maintain its rigidity when extended longitudinally (i.e., when digit 102 is in the first state). However, the strip snaps segments 104, 106 that are bent to the second position when sufficient bending force is applied.

[0057] The digits according to the present disclosure can include various other features to enable coupling with other digits and building elements to form an assembly. In some implementations, the digits can include features for holding the digit in a particular state or maintaining segments of the digit in a particular relative orientation. For example, referring back to FIG. 1A, the first segment 104 is positioned and shaped to include a retaining feature 134 (e.g., snap, bond, latch, magnet, press-fit bond, ball-socket fit, or similar feature) that mates with a complementary retaining feature 136 positioned on the second segment 106 to be held in place. The retaining features 134, 136 are disposed on the same first side of their respective segments 104, 106 and at locations along segments 104, 106 such that the retaining features 134, 136 couple together when the digit 102 is in the second state.

[0058] When coupled together, the retaining features 134, 136 maintain the digit 102 in a stable state where the first segment 104 is coupled to the second segment 106 and is substantially parallel, e.g., the second state or a parallel segment state. See FIG. 2D.

[0059] FIGS. 2A-2D illustrate a digit transitioning between its respective first state (e.g., a longitudinally aligned state), through an intermediate state, and a second state (e.g., a parallel segment state). In the embodiment shown in FIG. 2D, the second state is characterized by coupling the retaining features of each digit to maintain their segments in a parallel orientation.

[0060] Returning to FIGS. 1A and 1B, in addition to maintaining the first segment 104 and the second segment 106 in relative position and orientation, in any embodiment, the retention features 134 and 136 can be configured to generate additional tactile and / or audible "pop" or "snap" responses when coupled and / or decoupled from each other. For example, in some embodiments, the retention features 134, 136 have complementary detents and notches that generate a pop response or a snap response.

[0061] The retention features 134, 136 of the digit 102 are shown as a mating structure, but in other implementations, such structure can be supplemented or replaced by other mechanisms for holding the first segment 104 relative to the second segment 106. For example, in some implementations, the retention features 134, 136 are magnets disposed on or embedded within the surfaces of segments 104, 106, respectively. In some embodiments, the retention features 134, 136 are adhesive patches, surface fasteners, or other reversible retention features. In some embodiments, the retention features 134, 136 accommodate a third element (e.g., a pin) separate from the digit 102 to hold the first segment 104 relative to the second segment 106. In some embodiments, the retention features 134, 136 collectively form a loop, snap, buckle, clip, or similar retention structure.

[0062] A digit according to the present disclosure can include a retention feature, e.g., either the first segment 104 or the second segment 106, on a single segment. For example, the retention feature 134 can be a strap that can extend or wrap around the second segment 106 when the first segment 104 and the second segment 106 are in a parallel orientation, and in such embodiments, the second segment 106 does not include the retention feature 136. In view of the foregoing, a digit according to the present disclosure can include any suitable structure configured to maintain the first segment 104 in position or orientation relative to the second segment 106.

[0063] The digit may include additional features for connecting the digit to one or more other structures or components, including but not limited to other digits. In some embodiments, such interconnection functionality is provided by the digit's retention features. For example, the retention feature 134 of a first digit may be coupled to the retention feature 136 of a second digit, the retention feature 134 of the second digit may be coupled to the retention feature 136 of a third digit, and so on, forming a chain of digits linked by their respective retention features.

[0064] In addition to the retention features, the digit may optionally include additional features for facilitating coupling of the digit to other building elements (e.g., other digits and / or hubs), whether reversible (similar to mechanical interconnections) or permanent (e.g., by adhesives, welding, melting, etc.). Such features are generally referred to herein as coupling features or connection features, and may alternatively be referred to as digit coupling features and hub coupling features. Due to their respective structures and arrangements, the coupling features of any embodiment described herein may alternatively be referred to as pull tabs, i.e., tabs that facilitate separation of the digit from a second state, and may be claimed.

[0065] The coupling feature may be formed, for example, as a protrusion or a recess. For example, referring again to FIG. 1A, in the context of digit 102, the first segment 104 includes a coupling feature 140 disposed at the distal end 138 of the first segment 104, and the second segment 106 includes a coupling feature 142 disposed at its distal end 152. Each of the coupling features 140, 142 is a protrusion (a tab in this embodiment) that can be (permanently or reversibly) inserted, adhered, welded, or otherwise attached to a corresponding slot, recess, or surface of the other building element. More generally, the coupling features 140, 142 can be complementary male / female mating parts or other interlocking structures. Such coupling features enable the precise placement and secure connection of digits and hubs within the assembly, as described below.

[0066] In other instances, the coupling feature may facilitate a temporary or selective coupling of digits to other building elements. For example, the coupling feature may include a magnet, a press fit structure, a surface fastener, any of the retention features described herein, or other similar structures that can be connected, disconnected, and reconnected as needed. Such coupling features may be implemented, for example, when the digits are part of a building set intended to be assembled and disassembled into different configurations. As described below, the present disclosure provides such a building set that includes a plurality of building elements.

[0067] Some embodiments include different coupling features on different ends of a segment. For example, a digit may include a tab-type coupling feature at a distal end of a first segment and a ball joint or socket at a distal end of a second segment.

[0068] In some embodiments, an interference member may also function as a coupling feature. For example, if the digit 102 is configured such that the first segment 104 and the second segment 106 are substantially parallel, each of the ends 112 and 114 is exposed. Then, the digit 102 can be coupled to another building element by inserting the ends 112 and 114 into corresponding structures of the building element (e.g., complementary sockets and recesses). For example, to couple a first digit to a second digit, the ends 112 and 114 of the first digit can be inserted into the ends 114 and 112 of the second digit, respectively. This coupling concept is illustrated and discussed in more detail below in the context of FIGS. 8A-8F (below).

[0069] Digits and Digit-Based Structures The above concepts related to digits according to the present disclosure can be incorporated into and modified in a wide range of digit designs. This section provides various exemplary digits and digit assemblies, and also emphasizes various features of the exemplary designs. The exemplary implementations are not intended to limit the concepts discussed herein, but rather to illustrate them. The concepts included in any of the exemplary implementations can be combined or modified to reach designs not specifically illustrated or discussed herein. For example, a digit can include any combination of interference joints, coupling features, and / or retention features. As another example, a digit can include interference joints and retention features but not a coupling feature. As yet another example, a digit can include a structure other than a coupling feature at one or more of its distal ends, such as a living hinge that directly connects the digit to another building element such as a hub.

[0070] Figures 2A - 2D illustrate a group of digits according to the present disclosure. In particular, Figures 2A and 2B illustrate the front and back of a digit in an open or expanded configuration that can generally correspond to a first state of the digit. Figure 2C illustrates a digit in a partially folded / bent configuration that can correspond to an intermediate or bent state of the digit. In any implementation, the digit can be biased towards the bent state shown in Figure 2C. Such biasing can be imparted by an interference joint (e.g., a protrusion resists entry into a corresponding socket and biases the digit towards the bent state). Additionally or alternatively, the biasing can be imparted by the molding or other manufacturing process of the digit. Referring to Figure 2D, the digit can be further bent into a fully folded bent state or a parallel segment state, etc.

[0071] Figures 2A - 2D show a digit 202a that is the same as digit 102 of Figure 1A. Figures 2A - 2D also include a first alternative digit 202b that is similar to digit 202a. In contrast to digit 202a, which includes tab - type coupling features, digit 202b includes ball - type coupling features 240b, 242b, each of which is a spherical - shaped protruding joint configured to couple with a corresponding socket (such as shown in Figures 10A and 10B) of another component. Such ball - type joints allow for axial rotation and movement of digit 202b when coupled to another component. In other embodiments, the digit includes socket - type rather than ball - type coupling features.

[0072] Figures 2A - 2D also include a second alternative digit 202c that is similar to digit 202a and is particularly well - suited as a figurine. In contrast to digit 202a, digit 202c includes press - type coupling features 240c, 242c, each of which is a ring - shaped protrusion (although alternatively, any suitably shaped protrusion may be used). The coupling features 240c, 242c also function as pull tabs to facilitate separation of segments of digit 202c from a second state. In some embodiments, the coupling features 240c, 242c may be blind holes or through - holes and may be shaped to press - fit with retaining features 234c, 236c respectively. Some embodiments include one or more rings as coupling features 240c, 242c, for example, to facilitate connection to a keychain.

[0073] Figures 2A - 2D also include a third alternative digit 202d that is similar to digit 202a. In contrast to joint 108 of digit 102 in Figure 1A, joint 308d of 202d allows bending in both directions from a first state (a state where the longitudinal directions are aligned). In other words, when digit 202d is in the first state (e.g., a state where the first segment and the second segment are aligned), digit 202d can be bent in a first direction about 208d to transition to a second state, or bent in a second direction opposite to the first direction to transition to a third state that is similar to but opposite of the second state. When in the third state, digit 202d can be fully bent into a folded configuration, similar to the configuration shown in Figure 2D. Referring to Figure 2B, in some embodiments, the first segment and the second segment each comprise a second retaining feature disposed on their same second side, and the second retaining feature is configured to reversibly retain the first segment to the second segment. For example, digit 202d can include retaining features 244d, 246d that are disposed on opposite sides of their respective segments and can be coupled together to retain digit 202d in a folded configuration from retaining features 234d, 236d.

[0074] Figures 3A - 3C show a digit 302 that is the same as digit 202d of Figures 2A - 2D and thus includes a bi - directional interference joint 308. While other bi - directional joint configurations are possible using the structures described above, in at least one implementation, joint 308 includes an interlocking end portion that includes a plurality of links, each link extending from an end of either the first segment or the second segment. In particular, link 316 extends from end 312 of the first segment 304, and link 318 extends from end 314 of the second segment 306. Links 316, 318 each comprise bosses 346, 348 that extend away therefrom. In the illustrated embodiment, bosses 346, 348 are parallel to each other and parallel to joint axis 350. Each of bosses 346, 348 has a cylindrical cross - sectional shape, although in different embodiments, it can have an eccentric shape or other shapes.

[0075] When in the first state (i.e., in the state where segments 304, 306 are longitudinally aligned), links 316, 318 overlap but do not contact each other. When digit 302 is bent from the first state to the second state (e.g., out of the page in the perspective of FIG. 3A) or from the first state to the third state (e.g., into the page in the perspective of FIG. 3A), links 316 and link 318 contact and interfere with each other. When digit 302 is further bent, links 316 and link 318 deform and finally pass by each other, resulting in a tactile and / or audible "snap" or "pop" and a transition to the second state or the third state. To facilitate the bidirectional bending of digit 302, hinge 310 includes parallel strips 332a, 332b extending along the central plane of digit 302 (see FIG. 3C).

[0076] Figures 4A - 4D show additional views of digit 202c of FIGS. 2A - 2D. Joint 208c is similar to joint 108 of digit 102 of FIG. 1A.

[0077] Figures 5A - 5D illustrate an alternative digit 502 according to the present disclosure. Digit 502 combines various digit features previously discussed in the present disclosure. Digit 502 includes a first segment 504 coupled to a second segment 506 by joint 508, and the joint can take any form of joint discussed herein, but is shown to be substantially similar to joint 108 of digit 102 of FIG. 1A.

[0078] Like the digit discussed above, digit 502 can be operated by bending segments 504, 506 about joint 508. Like digit 102, digit 502 is configured to bend in one direction. Nevertheless, digit 502 includes two sets of retaining features. Specifically, digit 502 includes retaining features 544a, 546a on a first side of digit 502 and retaining features 544b, 546b disposed opposite retaining features 544a, 546a, respectively.

[0079] In use, digit 502 can be bent at joint 508 to couple retaining features 544a, 546a. However, digit 502 generally cannot be bent to couple retaining features 544b, 546b. Accordingly, retaining features 544b, 546b are intended to couple digit 502 to other components (e.g., digits or hubs).

[0080] Digit 502 further includes coupling features 540, 542, which can be used to couple digit 502 to other digits, hubs, etc. Coupling features 540, 542 are shown as tabs. However, those features can be replaced with any other type of coupling feature discussed for the purposes described herein or otherwise suitable.

[0081] Figures 6A - 6D illustrate an alternative digit 602 according to the present disclosure. Digit 602 is similar to digit 102 of Figure 1A and includes a first segment 604 coupled to a second segment 606 by a joint 608 that includes a living hinge 610. Digit 602 can be operated by bending segments 604, 606 about joint 608. Unlike the digits described above, joint 608 is not an interference joint, i.e., the ends of segments 604, 606 do not interfere when bent. Accordingly, joint 608 does not produce an audible and / or tactile snap or pop response when bent.

[0082] Digit 602 is, otherwise, substantially similar to the digits of the various aspects discussed herein and incorporates them. For example, digit 602 includes retention features 644, 646 that are magnets respectively embedded in segments 604, 606. Such embedded magnet retention features can be utilized in any digit described herein. In other implementations, retention features 644, 646 can be replaced with other components such as mating surface features.

[0083] Retention features 644, 646 can be coupled to each other, regardless of the direction in which digit 602 is bent about joint 608, to maintain digit 602 in a folded state. Retention features 644, 646 can also facilitate the coupling of digit 602 to other digits, hubs, etc.

[0084] Digit 602 further includes coupling features 640, 642 that can be used to couple digit 602 to other digits, hubs, etc. Coupling features 640, 642 are shown as tabs in FIGS. 6A - 6D. However, such features can be replaced with any other type of coupling feature that is discussed for the purposes described herein or is otherwise suitable.

[0085] Each of the above digits includes a single joint disposed between two segments. In other implementations of the present disclosure, a digit includes more than two joints and couples together more than two segments.

[0086] Referring to FIGS. 7A and 7B, digit 702 includes six segments 704a - 704f in a chain or series that are continuously coupled by five joints 708a - 708e that are each in contact with adjacent segments. The number of segments and joints is representative and other embodiments can include more or fewer segments and joints.

[0087] Segments 704a - 704f omit the retaining features and coupling features for simplicity. However, one or more segments within any multi - segment digit may include retaining features and / or coupling features as described above. Joints 708a - 708e are each similar to interference joint 108 of FIGS. 1A and 1B. Thus, adjacent segments 704a - 704f and corresponding joints 708a - 708e disposed therebetween are structurally and functionally similar to digit 102, i.e., each pair of adjacent segments can be transitioned from a first state, through an interference state, to a second state by bending about the joint, and the joint generates a snap and / or pop as the segment transitions between states. With this in mind, FIG. 7A shows digit 702 where each pair of adjacent segments and their respective joints are in a first state (longitudinally aligned state), while FIG. 7B shows digit 702 where each pair of adjacent segments and their respective joints are in a second state.

[0088] As shown in FIG. 7B, all joints 708a - 708e are configured to bend in the same direction so that all segments 704a - 704f can be bent in a common direction about their respective joints to form a substantially circular shape. In some embodiments, for example, one or more of joints 708a - 708e are configured to bend in a different direction with respect to one or more other joints 708a - 708e so that segments 704a - 704f can form a "zigzag" or similar shape. In some embodiments, one or more of joints 708a - 708e are configured to bend in both directions (e.g., using the bi - directional interference joint shown in FIGS. 3A - 3C).

[0089] In particular, in the present embodiment of FIGS. 7A and 7B, segments 704a-704f are shaped like a fish with a head and a tail. This shows the general possibility that some segments of the digits can be different from others. Of course, the segments can be shaped in any manner. For this purpose, in some embodiments, one or more of the elongated digits include a suitable plane or flat portion for applying a decal, product information, ornamentation, or other decoration.

[0090] The digits of the present disclosure can be joined together into digit-based assemblies.

[0091] FIGS. 8A-8F show one such digit-based assembly 800 of various configurations. Assembly 800 includes a plurality of digits 802a-802f joined together in a closed loop. Each of digits 802a-802f is similar to digit 102 of FIGS. 1A and 1B, except that in FIG. 8A, the tab-type coupling features 140, 142 of digit 102 are replaced by direct connections between adjacent digits. Thus, each of digits 802a-802f includes an interference joint that joins its segments. Each of digits 802a-802f is substantially the same. However, in other embodiments, the digits of the assembly can be different.

[0092] Figure 8A illustrates a first configuration of assembly 800 in which each digit 802a - 802f is oriented to fold inwardly. For purposes of the present disclosure, a digit incorporated into a closed structure or assembly is said to fold "inwardly" when the joint of the digit is generally directed toward the center of gravity of the closed structure after the digit is folded. Similarly, a digit in a closed structure is said to fold "outwardly" when the joint of the digit is generally directed away from the center of gravity of the closed structure after the digit is folded. For example, referring further to Figure 8A, when digit 802a is in its second state and / or when fully folded, its joint 808a is disposed radially inwardly from its retention feature toward the center of gravity of assembly 800.

[0093] In contrast, Figure 8B illustrates a second configuration of assembly 800 in which each digit 802a - 802f is oriented to fold outwardly. For example, when digit 802a is in its second state and / or when fully folded in the configuration shown in Figure 8B, joint 808a of digit 802a is disposed radially outwardly of the retention feature, i.e., away from the center of gravity of assembly 800. Stated another way, Figures 8A and 8B illustrate an inversion of assembly 800. Inverting assembly 800 between the configuration of Figure 8A and the configuration of Figure 8B may involve twisting or rotating digits 802a - 802f to the desired configuration about the loop axis. This inversion characteristic is enabled by the range of motion of the joint of each digit and, optionally, the flexible material (e.g., TPU) from which the digits are formed.

[0094] Figure 8C illustrates a variant of the configuration of Figure 8A in which assembly 800 is folded inwardly but not fully folded such that the retention features of each digit engage and each digit 802a - 802f is in its second state.

[0095] FIG. 8D illustrates a variant configuration of the folded-out assembly 800 where digits 802a-802f are in various configurations. Digits 802a, 802b are in a second state but are not fully folded. Digits 802c, 802f are in a fully folded configuration (i.e., engaged with their respective retaining features). Finally, digit 802d is coupled to digit 802e by engaging the retaining features of both digits (due to the coupling, the retaining features of digits 802d, 802e are blocked).

[0096] FIG. 8E illustrates another alternative configuration of the assembly 800. As discussed above in the context of digit 102, the digit joints according to the present disclosure may include interlocking structures such as socket 116 and protrusion 118. At least in certain implementations, such interlocking structures may also facilitate the coupling of the digits to each other. For example, when each of a pair of digits is in a fully folded configuration, the mating structures of the joints of each digit are exposed and can be coupled together. (See, e.g., FIG. 1A, where socket 116 of the first digit can be inserted into protrusion 118 of the second digit, and vice versa.)

[0097] FIG. 8E illustrates a first example of such a coupling where each of digits 802a and 802d is in a fully folded configuration and is coupled together by their respective joint structures. More specifically, the coupling between digit 802a and digit 802d occurs by inserting the joint protrusion of digit 802a into the joint socket of digit 802d and receiving the joint protrusion of digit 802d in the joint socket of digit 802a.

[0098] FIG. 8F is a further illustration of the concept of FIG. 8E, where digit 802a is paired with digit 802c and digit 802d is paired with digit 802f.

[0099] Hub and Other Building Elements The above-described implementations of the present disclosure included digits and assemblies of digits. In other implementations, the digits may be attached to, integrated with, or otherwise coupled to a non-digit structure. Such a structure includes a "hub" as described below. A given hub may have any suitable size, shape, and appearance, and may be attached to or selectively coupled to one or more digits. In certain implementations, the hub and digits can be selectively coupled to each other to form a building set (at least one digit and hub) that can be incorporated into a wide range of structures that can be easily assembled and disassembled. In other implementations, the hub and digits may be permanently fixed to each other. In any case, when the digits are attached to one or more hubs, the digits can transition between a state of dynamically changing and a state of reconfiguring the resulting structure.

[0100] Figures 9A-9D illustrate one exemplary hub 900 according to the present disclosure. In particular, Figures 9A-9C illustrate various views of the hub 900, while Figure 9D illustrates a perspective view of the hub 900 including the hub 900 and a digit 102.

[0101] The hub 900 includes a body 902 having a substantially triangular planar shape that defines an optional cutout portion 904. The body 902 further includes vertices 906a-906c that define coupling features formed as slots 908a-908c. The coupling features of any given hub are configured to mechanically couple with the coupling features of one or more digits. In the illustrated exemplary embodiment, the coupling features of the hub 900 are formed as slots and are thus configured to couple with tab-type coupling features (such as those shown with respect to the coupling features 140, 142 of the digit 102 in Figures 1A and 1B). However, other hubs may include coupling features configured as sockets, ball joints, tabs, and other interconnect structures configured to couple with complementary coupling features of the digits.

[0102] The triangular shape of the hub 900 is representative and not limiting. Other hubs of the present disclosure may have different shapes, including polygonal shapes (e.g., square, pentagonal, hexagonal, etc.). Advantageously, a large number of vertices increase the number of different assemblies that can be assembled with the digits.

[0103] The cut portion 904 is optional but facilitates the manipulation of the assembly into different states. In particular, the cut portion facilitates pulling the digits from a second state (e.g., a state where a plurality of digits are substantially parallel as shown in FIG. 17C) to a first state (e.g., a configuration aligned longitudinally as shown in FIG. 17B). Other hubs do not include such a cut portion and advantageously provide a flat or planar portion suitable for decals, product information, ornaments, or other decorative uses.

[0104] Referring to FIG. 9D, the coupling structure of the hub 900 can couple to the corresponding coupling structure of one or more digits, such as digit 102. In some embodiments, the digit 102 can be fixed to the hub 900 during manufacture. For example, the coupling features of the digit 102 can be adhered, welded, pinned, or otherwise attached to the coupling features of the hub 900. In some embodiments, the body 902 can include a number of parts such that the coupling features of the digit 102 are held within two or more parts of the hub 900 (e.g., sandwiched between parts) (e.g., the body 902 can have a clam shell or multi-layer laminate). In yet other implementations, the digit 102 and the hub 900 are integrally formed, e.g., injection molded, 3D printed, or otherwise manufactured as a single part.

[0105] In other implementations, the hub and the digit can be selectively coupled together in that they can include features adapted such that a given hub couples to the corresponding features of the digit. FIGS. 12B and 10B illustrate implementations, for example, in the context of FIGS. 2A-2D discussed above, where the hub is selectively coupled to the digit.

[0106] Figures 10A and 10B illustrate an alternative coupling technique that utilizes ball and socket connections. Referring to FIG. 10A, an assembly or building set includes a hub 1000 and a digit 1002. The hub 1000 includes a body with a number of sockets 1008a - 1008c disposed around its outer periphery (one at each vertex), and each socket is shaped to receive a corresponding ball protrusion coupling feature 1040 of the digit 1002 (as described above with respect to FIG. 2A). FIG. 10B shows the digit 1002 coupled to the hub 1000. Advantageously, the ball and socket coupling mechanism allows for a wider range of relative movement between the hub 1000 and the digit 1002 compared to press - fit type coupling features.

[0107] The above example of the hub and digit assembly is intended as a representative example. For example, FIGS. 12B and 10B illustrate selective coupling between a hub and a digit using press - fit type coupling features and ball and socket coupling features, respectively. However, implementations of the present disclosure may alternatively rely on magnets, reusable adhesive surfaces, hook - and - loop structures, interlocking structures (e.g., mortise and tenon, or dovetail joints), or any other suitable coupling means.

[0108] The hubs according to the present disclosure are also not limited to the specific shapes and structures illustrated in the figures discussed above. For example, FIGS. 9A - 9C, 12A, and 12B illustrate flat triangular and pentagonal hubs, but hubs in other embodiments may take the form of any regular (e.g., polygonal) or irregular shape.

[0109] As yet another example, the hubs of the present disclosure need not be substantially flat. Rather, the hub may have a space - filling structure similar to a parallelepiped (e.g., a cube), pyramid, tetrahedron, octahedron, dodecahedron, or other regular or irregular space - filling shape. Such a space - filling hub may have a substantially solid structure or may form a lattice of frame elements that provide a skeletal hub structure.

[0110] Each of the hubs of FIGS. 9A - 10B includes a circular cut - out portion, which can be of any suitable shape or can be completely omitted, for example, to provide a flat surface for applying a decal, product information, ornament, or other decoration.

[0111] The hubs can also be configured to couple to each other using any suitable coupling mechanism that includes a structure similar to any of the coupling features described herein. More generally stated, the hubs according to the present disclosure can be easily adapted to any suitable shape if they are configured to couple to one or more digits. Further, the above examples illustrate hubs having coupling locations regularly distributed around the surface or outer perimeter of the hub, but the hubs can be easily adapted to include any number of coupling locations disposed at any location on the hub.

[0112] FIG. 11 shows another hub 1100 that is similar to hub 900 and includes a body 1102 having a substantially triangular flat shape. The body 1102 further includes three vertices that define coupling features 1104a - 1104c.

[0113] FIG. 12A provides another exemplary hub 1200 having coupling features different from those of hub 900. In particular, hub 1200 includes a body 1202 having a number of coupling features 1204a - 1204c shaped to engage with digit coupling features, such as coupling features 240c, 242c of digit 202c (shown in FIG. 12B).

[0114] FIG. 13 illustrates an alternative hub 1300 that includes a pentagonal body 1302 having five vertices on each of which coupling features are formed.

[0115] Figures 14A - 14E illustrate an alternative hub 1400 according to the present disclosure. The hub 1400 includes a body 1402 having a substantially square flat shape that defines an optional cut - out portion 1404. The body 1402 further includes a truncated vertex (e.g., truncated vertex 1406) having a coupling feature 1408, such as a groove or other coupling feature configured to attach to or hold a digit - retaining coupling feature according to the present disclosure.

[0116] Figures 15A - 15E illustrate another alternative hub 1500 according to the present disclosure. The hub 1500 includes a body 1502 having a substantially triangular flat shape that defines an optional cut - out portion 1504. The body 1502 further includes truncated vertices (e.g., truncated vertices 1506), each having a coupling feature 1508, such as a groove or other coupling feature configured to attach to or hold a digit - retaining coupling feature according to the present disclosure.

[0117] Figures 16A - 16E illustrate another alternative hub 1600 according to the present disclosure. The hub 1600 includes a body 1602 having a substantially pentagonal flat shape that defines an optional cut - out portion 1604. The body 1602 further includes a truncated vertex (e.g., truncated vertex 1606) having a coupling feature 1608, such as a groove or other coupling feature configured to attach to or hold a digit - retaining coupling feature according to the present disclosure.

[0118] Toy assembly The above concepts related to hubs and digits can be incorporated into and modified for a wide range of structures and assemblies, including as toys. This section provides various exemplary designs for hub and digit structures and highlights various features of the exemplary designs. The exemplary implementations are not intended to limit the concepts discussed herein but rather to illustrate them. Concepts included in any of the exemplary implementations can be combined or altered to arrive at designs not specifically illustrated or discussed herein.

[0119] The assemblies described below can generally be characterized as "open" or "closed." An open assembly or open configuration generally comprises at least one digit decoupled from a hub, including a two-dimensional lattice. A closed assembly or closed configuration is generally characterized by a three-dimensional shape (e.g., a cube, tetrahedron, or icosahedron) and / or substantially all digits being coupled to the hub.

[0120] A closed assembly or closed configuration can be further characterized as "stable" or "unstable." In a stable configuration, the digits are stably in place by respective interference joints or retention features. For example, a stable configuration includes a closed configuration where each digit is stably longitudinally aligned by respective interference joints. As another example, a stable configuration includes a closed configuration where each digit is stably in a parallel segment state by respective retention features. A stable configuration can be characterized by rigidity and load-bearing capacity without significant deformation.

[0121] In contrast, in an unstable configuration, one or more of the digits freely flex or bend within a range of motion without significant interference from an interference joint (e.g., an interference member). For example, an unstable configuration includes a closed configuration where one or more of the digits are in a partial bent state where the interference member is not interfering (i.e., is released), as shown, for example, in FIG. 2C. An unstable configuration can be characterized by elasticity, spring reactivity, or generally being unable to support a load without significant deformation. An unstable configuration has higher elasticity than the stable configuration of the same assembly.

[0122] Any of the closed assemblies described herein has an inversion property, whereby the assembly can be inverted (i.e., turned inside out) into an inverted state without disconnecting or uncoupling any digit from the hub. This property is enabled by the range of motion of each joint. Optionally, the inversion property is facilitated by a flexible material (e.g., TPU) in which the digits are at least partially formed.

[0123] The following assemblies each have a number of independent degrees of freedom. In other words, any one of the digits can be transitioned between a first state and a second state independently of the other digits of the assembly.

[0124] Figures 17A - 17C illustrate an assembly 1700 comprising a plurality of digits (e.g., six digits such as digit 1702) each substantially similar to digit 202a (discussed above in the context of Figures 2A - 2D), and a plurality of hubs (e.g., four hubs such as hub 1704) each substantially similar to hub 1200 (discussed above in the context of Figure 12A).

[0125] Figure 17A illustrates assembly 1700 as an open assembly of a partially constructed configuration where the digits and hubs are not fully connected, resulting in a flat lattice, i.e., a substantially flat open structure or planar assembly of at least one hub coupled to at least one digit. Specifically, in Figure 17A, one coupling feature of each digit is coupled to one hub, but at least one other coupling feature of each digit is decoupled from any hub or other digit. Further, assembly 1700 of Figure 17A is substantially flat and planar. The lattice is an assembly useful for packaging purposes, and any assembly of at least one digit and at least one hub can be claimed as a lattice. Additionally, the lattice reduces the number of connection points that a user needs to make to realize a completed assembly of building elements. For example, the open - structured lattice shown in Figure 17A only needs to be connected in three places to realize the closed - structured assemblies 1700 of Figures 17B and 17C.

[0126] Figure 17B illustrates assembly 1700 in a stable closed assembly or closed configuration where the digits and hubs are fully connected, i.e., each coupling feature of each digit is coupled to a coupling feature of a hub. In the configuration of Figure 17B, each of the digits is stable in a first state (e.g., a longitudinally aligned state). Assembly 1700 generally forms a tetrahedral shape in this configuration. As will be understood from the description of other embodiments below, assembly 1700 has a number of degrees of freedom.

[0127] Referring to FIG. 17C, any or all of the digits can be bent / folded until each segment of each digit is completely folded into a second state where the segments of each digit are parallel to each other, and can be bent / folded into an alternative closed configuration that is completely folded. FIG. 17C illustrates an assembly 1700 in another stable closed configuration where all digits are in the second state or the completely folded state. In the second state or the completely folded state, the retaining features of at least one digit can be mated with the other retaining features of that digit.

[0128] Both of the closed assemblies of FIGS. 17B and 17C are in a stable state. For example, the closed configuration of FIG. 17B is stable because each digit is in an extended state. The closed configuration of FIG. 17C is stable because each digit is in a fully bent state (parallel segment state).

[0129] A user can assemble the assembly 1700 into a fully connected configuration from the grid of FIG. 17A, and then can vary the assembly 1700 between a first configuration (FIG. 17B) and a second configuration (FIG. 17C) and numerous intermediate states. When any of the digits is in the first state (as shown in FIG. 17B), the user can push on any of the hubs to move the digit to the second state. In any embodiment, the digits can include the interference joints described above. In such embodiments, manipulating the digit from the first state causes the interference joint to generate an audible and tactile feedback of an interesting "pop" or "snap".

[0130] When any of the digits is in the second state (shown in FIG. 17C), the user can pull on any of the hubs to extend one or more digits into a first state that is axially aligned. Manipulating the digit from the second state can also generate an audible and / or tactile feedback of a "pop" or "snap" due to the release of the retaining feature.

[0131] Accordingly, the assembly 1700 comprises a plurality of digits that are coupled to or couplable with a plurality of hubs. The assembly 1700 is reconfigurable between one open configuration and at least two different closed configurations. The assembly 1700 is reconfigurable between one stable closed configuration and at least one unstable closed configuration.

[0132] The remaining structures discussed in this section are illustrated as having permanently coupled (e.g., welded together) digits and hubs. In particular, each such structure may alternatively be constructed from suitable digits and hubs configured to be selectively coupled together, for example, in a building set.

[0133] Figures 18A - 18C illustrate an assembly 1800 comprising a plurality of digits (six digits in this embodiment), each substantially similar to digit 202d (discussed above in the context of FIG. 2A), and a plurality of hubs (four hubs in this embodiment), each substantially similar to hub 900 (discussed above in the context of FIGS. 9A - 9C). As discussed above in the context of FIG. 2A, digit 202d includes a bi - directional interference joint and is thus configured to transition and be retained between two opposing fully folded configurations.

[0134] FIG. 18A illustrates the assembly 1800 in a stable closed configuration where each digit is folded outwardly into a second state (parallel segment state). FIG. 18B illustrates the assembly 1800 in another stable closed configuration where some digits are folded inwardly into the second state and other digits are folded outwardly with respect to the center of gravity of the assembly. FIG. 18C illustrates the assembly 1800 in an unstable configuration where some digits are fully and partially folded outwardly and other digits are folded inwardly.

[0135] Assembly 1800 is one example of an extensible assembly that includes a plurality of hubs and a first plurality of digits. The plurality of hubs includes a first hub, a second hub, and a third hub. The first plurality of digits connects the first hub to the second hub and the third hub. Assembly 1800 has a number of degrees of freedom. For example, the relative distances between hubs 1802a - 1802c can be varied independently. For example, assembly 1800 is extensible from a first state (FIG. 18B) to a second state (FIG. 18C), where the first hub 1802a is spaced further from the second hub 1802b and the third hub 1802c by a greater distance in the second state than in the first state, and the second hub 1802b and the third hub 1802c are spaced the same distance apart in both the first and second states.

[0136] Accordingly, assembly 1800 includes a plurality of digits coupled to or couplable with the plurality of hubs. Assembly 1800 is reconfigurable between at least two stable closed configurations and at least one unstable closed configuration.

[0137] Figures 19A - 19D illustrate an assembly 1900 comprising a plurality of digits (here, 12 digits) each substantially similar to digit 102 (discussed above in the context of FIGS. 1A and 1B), and a plurality of hubs (here, 8 hubs) each substantially similar to hub 900 of FIG. 9A. When each digit of assembly 1900 is in a first state, assembly 1900 forms the stable, closed cubic shape shown in FIG. 19A. FIGS. 19B - 19D illustrate assembly 1900 with the digits in various states. Specifically, FIG. 19B illustrates assembly 1900 in an unstable, closed configuration where all digits are in a partially folded state. FIG. 19C illustrates assembly 1900 in another unstable, closed configuration where some digits are in the first state (aligned longitudinally), some digits are in a partially folded state, and some digits are in a second state (fully folded). FIG. 19D illustrates assembly 1900 in another stable, closed configuration where all digits are fully folded inward and are stabilized in the second state (parallel segment state) by retention features.

[0138] Accordingly, assembly 1900 comprises a plurality of digits coupled to or couplable with a plurality of hubs. Assembly 1900 is reconfigurable between a plurality of stable, closed configurations and a plurality of unstable, closed configurations.

[0139] Figures 20A - 20C illustrate an assembly 2000 that is substantially similar to assembly 1900, except that each digit is inverted so that each digit folds outwardly rather than inwardly. Thus, assemblies 1900 and 2000 have the inversion characteristics described above with respect to assembly 800, enabled by the range of motion of their respective joints and the flexible material (e.g., TPU) in which the digits are at least partially formed. In practice, assembly 1900 can be inverted into assembly 2000 without disconnecting or uncoupling any of the digits from the hub. This characteristic generally applies to all closed assemblies described herein.

[0140] Figure 20A illustrates assembly 2000 in an unstable closed configuration with each digit partially folded outwardly. Figure 20B illustrates assembly 2000 in another unstable closed configuration where some digits are folded outwardly into a second state (parallel segment state), some digits are partially folded outwardly, and some digits are in a first state (aligned longitudinally). Figure 20C illustrates assembly 2000 in a stable closed configuration where all digits are completely folded outwardly and are stabilized in a second state (parallel segment state) by retention features. When each digit of assembly 2000 is in the first state (aligned longitudinally), assembly 2000 has a stable cubic closed configuration similar to the configuration of assembly 1900 in Figure 19A.

[0141] Accordingly, assembly 2000 includes a plurality of digits coupled to or couplable with a plurality of hubs. Assembly 2000 is reconfigurable between a plurality of unstable closed configurations and a plurality of stable closed configurations.

[0142] Figures 21A - 21E illustrate an assembly 2100 comprising a plurality of digits (30 digits in this embodiment), each substantially similar to digit 102 (discussed above in the context of FIG. 1A), and a plurality of hubs (here, 12 pentagonal hubs), each substantially similar to the hub of FIG. 13. As shown in the stable closed configuration of FIG. 21A, when each digit of assembly 2100 is in a first state (aligned longitudinally), assembly 2100 forms a stable icosahedral shape. Figures 21B - 21E illustrate assembly 2100 with digits in various folding stages. FIG. 21B illustrates assembly 2100 in an unstable closed configuration where all digits are partially folded. FIG. 21C illustrates assembly 1900 in a stable closed configuration where all digits are fully folded inwardly into a second state (parallel segment state). FIG. 21D illustrates assembly 1900 in another stable closed configuration where a first set of digits are fully folded inwardly into the second state and the remaining digits are in the first state (aligned longitudinally). FIG. 21E illustrates assembly 1900 in yet another stable closed configuration where a second set of digits are fully folded inwardly into the first state and the remaining digits are in the second state.

[0143] Similar to the previous assembly, assembly 2100 has a number of degrees of freedom. For example, the relative distances between hubs 2102a - 2102c can be independently varied. For example, assembly 2100 is expandable from a first state (FIG. 21C) to a second state (FIG. 21E), and first hub 2102a is spaced further from second hub 2102b and third hub 2102c by a greater distance in the second state than in the first state, while second hub 2102b and third hub 2102c are spaced the same distance apart in both the first and second states.

[0144] Accordingly, assembly 2100 comprises a plurality of digits coupled to or couplable with a plurality of hubs. Assembly 2100 is reconfigurable between a plurality of unstable closed configurations and a plurality of stable closed configurations.

[0145] Figures 22A - 22C show an assembly 2200 that is substantially the same as assembly 2100, except that the direction of each digit is reversed so that each digit is folded outward instead of inward. Thus, assemblies 2100 and 2200 have the inversion characteristics described above with respect to assemblies 800, 1900, and 2000, enabled by the movement range of their respective joints and the flexible material (e.g., TPU) in which the digits are at least partially formed. Assembly 2100 can be inverted into assembly 2200 without disconnecting or uncoupling any of the digits from the hub.

[0146] Figure 22A illustrates assembly 2200 in an unstable closed configuration with each digit partially folded outward. Figure 22B illustrates assembly 2200 in another unstable closed configuration where some digits are fully folded outward into a second state (parallel segment state) and some digits are partially folded outward. Figure 20C illustrates assembly 2200 in a stable closed configuration with all digits fully folded outward into the second state. When each digit of hub 900 is in a first state (aligned longitudinally), assembly 2200 has an icosahedral structure similar to the structure of assembly 2100.

[0147] Figures 23A - 23C illustrate an assembly 2300 comprising a plurality of digits (here, six digits), each substantially similar to digit 102 (discussed above in the context of FIGS. 1A and 1B), and a plurality of hubs (here, four triangular hubs), each substantially similar to hub 900. Assembly 2300 is substantially similar to assembly 1700, although its digits are permanently attached to the hubs. When each digit of assembly 2300 is in a first state (aligned longitudinally), assembly 2300 forms a stable closed tetrahedral configuration. FIG. 23B illustrates assembly 2300 in another stable closed configuration where some digits are in the first state and some digits are in a second state folded completely inwardly. FIG. 23C shows assembly 2300 in another stable closed configuration folded into the second state with all digits folded completely inwardly.

[0148] Figures 24A and 24B illustrate an assembly 2400 that is substantially similar to assembly 2300 except that the direction of each digit is reversed so that each digit folds outwardly instead of inwardly. See the above description of the reversed assemblies 800, 1900, 2000, 2100, 2200. When each digit of assembly 2400 is in a first state (aligned longitudinally), assembly 2400 has a stable closed tetrahedral configuration similar to that of assembly 2300. FIG. 24A illustrates assembly 2400 in an unstable closed configuration where each digit is partially folded outwardly. FIG. 24B illustrates assembly 2400 in a stable closed configuration with all digits folded completely outwardly into a second state (parallel segment state).

[0149] Materials and Manufacturing The digits according to the present disclosure can be formed using a wide range of materials and manufacturing techniques. Generally, any material or manufacturing process that enables the creation of joints that function as described herein can be used. However, in at least one implementation, the digits can be formed from thermoplastic polyurethane (TPU). Generally, TPU is a flexible and durable material suitable for consumer goods such as toys. TPU is also suitable for a range of manufacturing processes including, but not limited to, injection molding and 3D printing.

[0150] TPU has properties suitable for various applications of the present disclosure. Other suitable non-limiting materials from which the digits of the present disclosure can be formed include thermoplastic rubber (TPR) or polypropylene (PP). Similarly, in certain implementations, the digits according to the present disclosure can be formed by injection molding and 3D printing. However, the present disclosure contemplates other manufacturing processes including, but not limited to, molding, casting, additive manufacturing (e.g., 3D printing and variations of 3D printing such as stereolithography (SLA), selective laser sintering (SLS), fused deposition modeling (FDM), digital light process (DLP), multi-jet fusion (MJF), direct metal laser sintering (DMLS), and electron beam melting (EBM)), and subtractive manufacturing (e.g., machining).

[0151] The hubs and components to which digits can be coupled are not limited to any particular material or manufacturing process. In contrast to digits, which generally include flexible joints, hubs and similar components can be substantially rigid and, as a result, can be formed from a wider range of materials. Non-limiting examples of such materials suitable for use in forming the hubs of the present disclosure are acrylonitrile butadiene styrene (ABS).

[0152] Components according to the present disclosure can also be formed from a number of parts, each of which can be formed from different metals and / or using different manufacturing processes. For example, a digit can include a joint portion made of TPU coupled to segments formed from different plastic or non-plastic materials.

[0153] As described above, in certain implementations, an assembly / structure can be manufactured that includes one or more hubs coupled to one or more digits such that the hubs and digits are integrally formed. In other implementations, at least a portion of the hubs and digits can be formed together as an integral assembly that can be later (permanently or selectively) attached to one or more other digits, to a hub, or to an assembly of digits and hubs.

[0154] To facilitate manufacturing and packaging, an assembly of digits and hubs can be formed into a substantially flat lattice or similar open structure using a manufacturing process (e.g., an injection molding process) as described above with respect to FIG. 17A. The lattice can then be closed by securing the particular digits and hubs to form a closed structure.

[0155] FIG. 25 illustrates a hub and digit lattice 2500 that can be formed using, for example, injection molding or a similar process. The lattice 2500 is substantially similar to the lattice assembly 1700 of FIG. 17A. Following the formation of the lattice 2500, the lattice 2500 can be closed by attaching specific hubs and digits, as indicated by lines 2502a - 2502c, to the points illustrated. For example, the hubs and digits can be joined together using an adhesive, welding, or a similar joining process. When joined as illustrated by lines 2502a - 2502c, the lattice 2500 closes into a tetrahedral assembly, such as the assembly 2300 of FIGS. 23A - 23C or the assembly 2400 of FIGS. 24A and 24B.

[0156] FIG. 26 illustrates a similar concept for forming a structure from multiple lattices. In particular, FIG. 26 shows a first lattice 2602a and a second lattice 2602b, each formed with respective digits and hubs as described above with respect to FIG. 17A. Each of the first lattice 2602a and the second lattice 2602b can be formed separately, for example, by injection molding, and then joined together into a closed structure by connecting the points indicated by guide lines 2604a - 2604f. When joined as illustrated by guide lines 2604a - 2604f, the lattices 2602a and 2602b form a closed cubic assembly, such as the assembly 1900 of FIG. 19A and the assembly 2000 of FIG. 20A.

[0157] Additional Implementations Figures 27A - 27E illustrate assembly 2700 according to the present disclosure. Assembly 2700 is arranged in a star pattern where five digits (e.g., digit 2702) are coupled to and extend from a central hub 2704. Each of the digits includes a number of interference joints, and each of the interference joints provides a tactile snap / pop as discussed throughout the present disclosure. The digits are also illustrated as being fixed to the central hub 2704 by similar interference joints. However, in other implementations, the digits may alternatively be selectively coupled to the central hub 2704 using any of the removable or permanent coupling structures discussed herein.

[0158] Figure 27A illustrates assembly 2700 where each digit is in a first state (longitudinally aligned state). Figure 27B illustrates assembly 2700 where each digit is in a second state.

[0159] Figures 28A - 27E illustrate assembly 2800, which is a variant of assembly 2700. In particular, assembly 2800 includes six digits (e.g., digit 2802) extending from a central hub 2804.

[0160] Figures 29A - 29E illustrate assembly 2900, which includes a single multi - jointed digit where each joint is an interference joint as described with respect to digit 102 of FIG. 1A. Like the other digits of the present disclosure, each joint of assembly 2900 can be transitioned between a first state (longitudinally aligned state) and a second state, and this transition provides a tactile and audible snap / pop response.

[0161] FIG. 29A illustrates assembly 2900 with each joint in a first state, while FIG. 29B illustrates assembly 2900 with each joint in a second state. Assembly 2900 also includes complementary mating ends 2902, 2904 that can be joined together to transition assembly 2900 from a linear / open configuration (e.g., as shown in FIG. 29A) to a closed loop (e.g., as shown in FIG. 29B).

[0162] FIGS. 30A-30E illustrate another assembly 3000 that includes a single multi-junction digit. Like other digits of the present disclosure, each joint within assembly 3000 can be transitioned between a first state and a second state, and this transition provides a tactile snap / pop response. FIG. 30A illustrates assembly 3000 with each joint in a first state, while FIG. 30B illustrates assembly 3000 with each joint in a second state. As illustrated in the figures, assembly 3000 includes an end 3002 that defines a coupling feature with a hole configured to receive a protrusion of complementary shape.

[0163] FIG. 31 illustrates yet another assembly 3100 of the present disclosure, which illustrates that the digits, building elements, and assemblies of the present disclosure are not limited purely to geometric implementations. For example, assembly 3100 resembles an anthropomorphic humanoid that includes a plurality of anatomical digits and hubs similar to other assemblies described hereinabove. In particular, assembly 3100 includes digits 3102a-3102d operably coupled to hubs 3104a-3104b by the coupling features described above.

[0164] Digits 3102a, 3102b are arm-like and are coupled to a multi-planar hub 3104a that is shoulder-like. Thus, the coupling elements of digits 3102a - 3102b and hub 3104a can be of a ball and socket type structure to simulate a human range of motion. Joints 3108a, 3108b are interference joints as described above and are positioned as elbows. An optional attachment 3106 that is head-like can be coupled to hub 3104a. Other embodiments may include additional attachments (e.g., a tail).

[0165] Hub 3104a is coupled to hub 3104b by a multi-joint digit 3102e that is spine-like. Digit 3102e includes at least two interference joints as described above and includes a socket-type coupling feature at a lower end for coupling to a ball-type coupling feature of hub 3104b.

[0166] Hub 3104b is a multi-planar hub that is pelvis-like and has coupling features for coupling to digits 3102c - 3102d. As shown, the coupling features are disposed in different planes.

[0167] Digits 3102c, 3102d are leg-like and joints 3108c, 3108d are positioned as knees. Advantageously, interference joints 3108a - 3108d enable the assembly 3100 to be positioned in different stances, poses, or positions.

[0168] The assembly 3100 described above simply represents one potential assembly formed by the building elements of the present disclosure. It is clear that in other embodiments, the assembly can resemble a vehicle, a building, or other structures.

[0169] The foregoing description has introduced a number of representative digits, hubs, their assemblies, grids, and building sets that illustrate the breadth of the present invention. The present disclosure includes additional digits having any combination of the different types of interference joints, coupling features, and retention features described herein. The present disclosure also includes additional hubs having any number of vertices and any combination of coupling feature types and retention feature types. In other words, different types of coupling features and retention features can be freely combined.

[0170] The present disclosure does not limit the aesthetic elements of digits, hubs, and other components. Digits, hubs, and other components can have any suitable decorative design. For example, hubs and digits can be any color (including a number of colors), and / or graphics and similar elements (e.g., text, logos, etc.) can be printed or otherwise decorated. Similarly, the present disclosure does not limit the tactile or similar aspects of digits and other components. For example, digits and other components according to the present disclosure can include one or more surfaces that have been textured, embossed, relief processed, etc.

[0171] As used herein, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Generally, the nomenclature used herein is well known and commonly employed in the art.

[0172] As used herein, the articles “a” and “an” refer to one or more than one (i.e., at least one) of the grammatical object of the article. By way of example, “an element” means one element or more than one element.

[0173] The expression “at least one of A, B, or C” includes all of A, B, C, AB, AC, BC, ABC.

[0174] As used herein, the term "about" is understood by those skilled in the art and varies somewhat depending on the context in which it is used. As used herein, when referring to measurable values such as amounts, time periods, etc., "about" means including such variations of ±20%, or ±10%, more preferably ±5%, even more preferably ±1%, and even more preferably ±0.1% from the specified value, such that the variations are appropriate for carrying out the disclosed method.

[0175] Throughout the present disclosure, various aspects of the present disclosure 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 immutable limitation on the scope of the present disclosure. Accordingly, a description of a range should be interpreted to include all possible sub-ranges specifically disclosed within the range, as well as the individual numerical values within that range, and, where appropriate, the fractional integers of the numerical values within the range. For example, a description of a range such as 1 to 6 should be considered to specifically disclose sub-ranges such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, etc., as well as the individual numbers within that range, such as 1, 2, 2.7, 3, 4, 5, 5.3, and 6. This applies regardless of the breadth of the range.

[0176] The description herein includes numerous exemplary implementations, which should be construed as merely providing exemplary examples and not as limiting the scope of the present disclosure.

[0177] All references throughout the present disclosure (e.g., issued patents or acquired patents or equivalents, published patent applications, and non-patent literature, or other sources) are hereby incorporated by reference in their entirety as if each reference were individually incorporated by reference, to the extent that each reference is at least partially consistent with the present disclosure of this application (e.g., references that are partially inconsistent are incorporated by reference except for the partially inconsistent portions of the reference).

[0178] One of ordinary skill in the art will recognize, or be able to ascertain using no more than routine experimentation, numerous equivalents to the specific procedures, embodiments, claims, and examples described herein. Such equivalents are considered to be within the scope of this disclosure and are covered by the claims appended hereto. Generally, the terms and phrases used herein have their technically recognized meanings which can be found by reference to standard treatises, journal references, and contexts known to those of ordinary skill in the art. Any foregoing definitions are provided to clarify their specific use in the context of the present disclosure.

[0179] It is to be understood that whenever values and ranges are provided herein, all values and ranges encompassed by these values and ranges are meant to be within the scope of this disclosure. Further, all values within these ranges, as well as the upper or lower limits of ranges of values, are also contemplated by this disclosure.

[0180] The entire disclosure of any patent, patent application, and publication cited herein is hereby incorporated by reference in its entirety.

[0181] Although the present disclosure includes reference to specific embodiments, it will be apparent that other embodiments and modifications of the present disclosure can be devised by others without departing from the true spirit and scope of the present disclosure. The appended claims are intended to cover all such embodiments and equivalent modifications.

Claims

1. A digital toy comprising a first segment and a second segment connected by a joint having a living hinge, wherein when the joint transitions between a first state and a second state, an interference member of the joint interferes, the first segment and the second segment each having a first retaining feature disposed on their same first side, the first retaining feature reversibly retaining the first segment to the second segment in the second state.

2. The toy according to claim 1, wherein the interference member comprises locking ends of the first segment and the second segment.

3. The toy according to claim 2, wherein the locking ends define a socket and a protrusion.

4. The toy according to claim 3, wherein the socket and the protrusion interfere when the joint is in the first state.

5. The toy according to claim 4, wherein in the first state, the first segment and the second segment are longitudinally aligned, and in the second state, the first segment and the second segment are out of longitudinal alignment.

6. The toy according to claim 5, wherein when the joint transitions from an interference state, the socket and the protrusion are released from interference.

7. The toy according to claim 6, wherein the first segment and the second segment each have a tab disposed at their distal ends.

8. The digital toy according to claim 1, wherein in the first state, the first segment and the second segment are longitudinally aligned, and in the second state, the first segment and the second segment are out of longitudinal alignment.

9. The digital toy according to claim 8, wherein the interference member interferes when the joint is in the first state.

10. The digital toy according to claim 9, wherein at least one of the interference members is flexible.

11. The digital toy according to claim 10, wherein at least one of the interference members deforms and is released.

12. The digital toy according to claim 11, wherein the first segment and the second segment each have a tab disposed at their distal ends.

13. ​ The digital toy according to claim 1 or 2, wherein the interference member interferes when the joint is in the first state.

14. The digital toy according to claim 1 or 2, wherein the interference member is released from interference when the joint transitions from an interference state.

15. The digital toy according to claim 14, wherein the interference member is released when the first segment and the second segment form an interior angle below a bending threshold value.

16. The digital toy according to claim 14, wherein the interference member is deformed and released.

17. The digital toy according to claim 14, wherein the release of the interference member generates an audible pop response.

18. The digital toy according to claim 14, wherein the release of the interference member generates a tactile pop response.

19. The digital toy according to claim 1 or 2, wherein at least one of the interference members is flexible.

20. The digital toy according to claim 1 or 2, wherein the living hinge is offset from a central plane of at least one of the first segment or the second segment.

21. The digital toy according to claim 1 or 2, wherein the interference member comprises a plurality of links, each link extending from an end of the first segment or the second segment.

22. The digital toy according to claim 1 or 2, wherein the first segment and the second segment each comprise second retaining features disposed on their same second side surfaces, the second retaining features being configured to reversibly retain the first segment to the second segment.

23. The digital toy according to claim 1 or 2, wherein the first segment and the second segment each comprise coupling features formed as protrusions or recesses disposed at their distal ends.

24. Further comprising a third segment connected to the second segment by a second joint, wherein when the second joint transitions between a first state and a second state, a second interference member of the second joint interferes. The digital toy according to claim 1 or 2.

25. A toy, comprising an assembly comprising a plurality of hubs coupled to a plurality of digits. Comprising a first segment and a second segment, each digit being connected by a joint with a living hinge, when the joint transitions between a first state and a second state, an interference member of the joint interferes, the first segment and the second segment each comprise a first retaining feature disposed on their same first side surface, and the first retaining feature reversibly retains the first segment to the second segment in the second state. The assembly includes a toy having two or more independent degrees of freedom. **Claim 26** The toy according to claim 25, wherein the interference member comprises locking ends of the first segment and the second segment. **Claim 27** The toy according to claim 26, wherein the locking ends define a socket and a protrusion. **Claim 28** The toy according to claim 25 or 26, wherein the interference member interferes when the joint is in the first state. **Claim 29** The toy according to claim 25 or 26, wherein the toy is configured to be turned inside out without decoupling the digits from the hub. **Claim 30** A toy, Comprising an assembly having a plurality of hubs coupled to a plurality of digits, Each digit comprises a first segment and a second segment connected by a joint with a living hinge, when the joint transitions between a first state and a second state, an interference member of the joint interferes, the first segment and the second segment each comprise a first retaining feature disposed on their same first side surface, and the first retaining feature reversibly retains the first segment to the second segment in the second state. The assembly is configurable between a plurality of stable closed configurations and a plurality of unstable closed configurations. **Claim 31** The toy according to claim 30, wherein the interference member comprises locking ends of the first segment and the second segment. **Claim 32** The toy according to claim 30 or 31, wherein in each of the stable closed configurations, the plurality of digits are stable in the first state or the second state. **Claim 33** The toy according to claim 32, wherein in each of the unstable closed configurations, at least one digit of the plurality of digits bends freely about the joint. **Claim 34** The toy according to claim 30 or 31, wherein the toy is configured to be turned over without decoupling the plurality of digits from the hub.

35. A building set comprising: A digit comprising a first segment and a second segment connected by a joint having a living hinge, wherein when the joint transitions between a first state and a second state, an interference member of the joint interferes, and the first segment and the second segment each comprise a first retaining feature disposed on their same first side, the first retaining feature reversibly retaining the first segment to the second segment in the second state, and the first segment and the second segment each comprise a hub coupling feature disposed at their distal ends; a digit; A hub defining a plurality of digit coupling features disposed around the body; The building set, wherein the hub coupling feature reversibly connects to the digit coupling feature.

36. The building set according to claim 35, wherein the interference member comprises locking ends of the first segment and the second segment.

37. The building set according to claim 35, wherein the digits and the hub form a lattice and the hub coupling features and the digit coupling features are joined together.

38. The building set according to claim 35, wherein the hub coupling feature and the digit coupling feature comprise complementary structures including slots and tabs, or ball joints and sockets.

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