Rotatable demountable blocks of several shapes on a central elastic anchor

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• a plurality of hollow polyhedron building blocks,
• a stretchable elastic cord for threading a plurality of said building blocks and establishing a first configuration of said threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block
• means for terminating said cord in said last building block
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks, said surfaces including openings for receiving said cord,
• said openings including at least one elongated opening extending over at least two contiguous ones of said surfaces, and
• cord guiding means for establishing a common axis of a first relative position with an adjacent building blocks on said cord.
• said building blocks further include building blocks having centering means for guiding said cord through the center of said building blocks,
• wherein said cord guiding means being provided by said centering means,
• wherein said centering means include a hook for receiving said cord, and
• wherein said cord guiding means being established by sliding said cord behind said hook.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• a plurality of hollow polyhedron building blocks,
• a stretchable elastic cord for threading a plurality of said building blocks and establishing a first configuration of said threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block, means for terminating said cord in said last building block,
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks, said surfaces including openings for receiving said cord,
• said openings including at least one elongated opening extending over at least two contiguous ones of said surfaces, and
• cord guiding means for establishing a common axis of a first relative position with an adjacent building blocks on said cord;
• said building blocks include building blocks having
• a central axis section with a first and a second end, and two half shells mounted spaced apart on said first and said second end of said central axis section in opposite direction thereby forming a polyhedron building block,
• each of said half shells providing partial interface surfaces of said blocks,
• pairs of said partial interface surfaces of said two shells constituting said surfaces for interfacing with adjacently threaded building blocks,
• said space between said two half shells constituting said opening for receiving said cord.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of classes of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block,
• means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis forming a second configuration of said assembly of threaded building blocks;
• said building blocks including building blocks consisting of two equal polyhedron rings each having at least three surfaces, and a center board
• said rings being co-axially arranged with associated surfaces being in the same plane, and spaced apart providing a circumferential opening for receiving said cord,
• said center board radially spanning the space inside said rings between two associated pairs of surfaces of said polyhedral rings,
• said center board having a first opening for receiving said cord.
• said associated surfaces providing for selectively interfacing with adjacent building blocks.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of classes of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block, means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis thereby forming a second configuration of said assembly of threaded building blocks;
• said building blocks includes building blocks having at least one center board radially spanning the space inside said building blocks, and
• at least one elongated opening associated with at least three contiguous interface surfaces for selectively interfacing with adjacent building blocks,
• said center board including a first opening for threading said cord through said building block.

An educational experimenting device using hollow polyhedron building blocks and an elastic cord for stringing said building blocks for building modifiable configurations of threaded building blocks comprising

• a plurality of different types of building blocks,
• each of said building blocks including openings in at least two interface surfaces for interfacing with adjacently stringed building blocks,
• said openings include at least one pair of elongated openings in adjacent ones of said interface surfaces extending from the center of the common edge of said adjacent interface surfaces through the center of said interface surfaces,
• said elongated openings providing for the modifiability of said configuration;
• said plurality of types of building including a type of polyhedron building blocks comprising
• a plurality of interface surfaces including
• a plurality of first interface surfaces having an opening extending from the center of the common edge with an adjacent one of said interface surfaces to about a quarter of the width of said opening beyond the center of said interface surfaces, and
• a second interface surface having a first opening extending from the center of a first edge of said second interface surface to the center of a second edge opposing said first edge, and a second opening extending from the center of a third edge of said second interface surface to the center of a fourth edge opposing said third edge,
• said first and second interface surfaces being arranged in pairs of first interface surfaces meeting with opposing edges of said second interface surface and having the associated openings aligned;
• and
• a third interface surface having a center opening.

An educational experimenting device using hollow polyhedron building blocks and an elastic cord for stringing said building blocks for building modifiable configurations of threaded building blocks comprising

• a plurality of different types of building blocks,
• each of said building blocks including openings in at least two interface surfaces for interfacing with adjacently stringed building blocks,
• said openings include at least one pair of elongated openings in adjacent ones of said interface surfaces extending from the center of the common edge of said adjacent interface surfaces through the center of said interface surfaces,
• said elongated openings providing for the modifiability of said configuration;
• said plurality of types of building including a type of a three-dimensional polyhedron building block comprising
• a plurality of said interface surfaces and at least one open-sided interface,
• said open-sided interface having edges including means for holding an equally sized interface surface of another adjacently stringed building block in position.

An educational experimenting device using building blocks and an elastic cord for stringing said building blocks for building modifiable configurations comprising

• polyhedron building blocks having surfaces for interfacing with adjacent polyhedron building blocks and means for centering interfacing surfaces
• said centering means including elongated openings;
• each of said elongated openings extending over at least two adjacent surfaces of said building block for guiding said cord and establishing a common axis for said building block and an adjacent building block;
• said surfaces sharing the same elongated opening providing selective choices for interfacing said building block with a surface of said adjacent building block surfaces of said building block
• thereby allowing to change the configuration of a threaded sequence of building blocks without removing one of said building blocks from said cord;
• said building blocks include building blocks having
• a central axis section with a first and a second end, and rotatably mounted on said first and said second end spaced apart and in opposing direction
• two half shells spaced thereby forming a polyhedron building block,
• each of said half shells providing a plurality of partial interface surfaces of said building blocks, pairs of said partial interface surfaces of said two shells constituting said surfaces for interfacing with adjacently threaded building blocks,
• said space between said two half shells constituting said opening for receiving said cord,
• said rotatable shells providing a 360.degree. elongated opening.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of classes of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block, means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis thereby forming a second configuration of said assembly of threaded building blocks;
• said building blocks including building blocks consists of a first block section and a second block section,
• each of said block sections having an open face, a plurality of interface surfaces, a first opening and a second opening in said interface surfaces,
• said interface surfaces and said open face being perpendicular to a central plane of said building block,
• said first opening extending from the center of a first common edge of said open face with a first interface surface to at least a quarter of a diameter of said cord beyond the center of said first interface surface,
• said second opening extending over two contiguous interface surfaces from the center of a second common edge of said open face with a second interface surface through the center of a third common edge of said second interface surface with a third interface surface to at least a quarter of a diameter of said cord beyond the center of said third interface surfaces associated with said third common edge,
• said first and said second common edges opposing each other in the plane of said open face,
• the centers of said first and said second openings being in said center plane, and wherein said second block section is sized to fit inside said first block section.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of classes of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block,
• means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis thereby forming a second configuration of said assembly of threaded building blocks;
• said building blocks including building blocks consists of a two half block sections,
• each of said block sections constituting a half of a cubic building block,
• each of said block sections including an open face, four half interface surfaces and an full interface surface,
• a first interface surfaces including a semicircle constituting the end of an elongated opening beyond the center of an interface surface of the assembled building block,
• a second half interface surface and said full interface surface including an elongated opening beginning at the center of the common edge of said second half interface surface with said open face, extending to the center of the common edge of said second half interface surface with said full interface surface to a quarter of the diameter of said cord beyond the center of said full interface surface,
• said four half interface surfaces including means for linking said two half block sections.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of class of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block,
• means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis thereby forming a second configuration of said assembly of threaded building blocks;
• said building blocks including building blocks consists of a four block sections,
• each of said block sections constituting a quarter of a cubic building block,
• each of said block sections including two open faces, two side faces and a first and a second long face,
• said first long face including a semicircle constituting the end of an elongated opening beyond the center of an interface surface of the assembled building block, and two locking recesses for receiving locking tongues of an adjacent section of said assembled building block,
• said side faces including said locking tonques for interlocking with said locking recesses,
• said assembled building block having elongated openings between said interlocked sections aligned with said semi-circles.

An educational experimenting device for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of classes of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block,
• means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis thereby forming a second configuration of said assembly of threaded building blocks;
• said building blocks including building blocks consists of a two block sections,
• each having an open face, a plurality of interface surfaces, a first opening and a second opening in said interface surfaces, said interface surfaces and said open face being perpendicular to a central plane of said building block,
• said first opening extending from the center of a first common edge of said open face with a first interface surface to at least a quarter of a diameter of said cord beyond the center of said first interface surface,
• said second opening extending over two contiguous interface surfaces from the center of a second common edge of said open face with a second interface surface through the center of a third common edge of said second interface surface with a third interface surface to at least a quarter of a diameter of said cord beyond the center of said third interface surfaces associated with said third common edge,
• said first and said second common edges opposing each other in the plane of said open face,
• the centers of said first and said second openings being in said center plane,
• and wherein said second block section is sized to fit inside said first block section.

An educational experimenting device using building blocks and an elastic cord for stringing said building blocks for building modifiable configurations of threaded building blocks comprising

• building blocks from a plurality of classes of hollow polyhedron building blocks,
• an elastic cord for threading a plurality of said building blocks from said plurality of classes of building blocks for establishing an assembly of threaded building blocks including a first building block, a sequence of building blocks, and a last building block,
• means for terminating said cord in said first building block,
• means for terminating said cord in said last building block,
• said assembly of threaded building blocks constituting a first configuration of threaded building blocks;
• each of said building blocks having
• surfaces for interfacing with adjacently threaded building blocks and associated with said interface surfaces elongated openings for receiving said elastic cord;
• cord guiding means for establishing a common axis for a relative position with an adjacent building blocks,
• said elastic cord when stretched between adjacent ones of said building blocks providing space for changing a first relative position between said adjacent building blocks with a first common axis to a second relative position with a different common axis thereby forming a second configuration of said assembly of threaded building blocks;
• said polyhedron building blocks having surfaces for interfacing with adjacently stringed building blocks;
• said surfaces including locking means for preventing rotation between adjacent building blocks;
• said locking means include circular arrangements of substantially triangular planes alternatingly angled relative to the plane of said surface thereby providing radially
• directed protrusions and recesses in said surfaces;
• whereby protrusion and recesses of a surface of one building block match with those of a surface of an adjacently stringed building block.

An educational device for users experimenting with modifiable stringable building blocks comprising

• an stretchable elastic cord having a first and a second end;
• a plurality of polyhedron hollow building blocks of different shapes each having at least a first opening and a second opening, and
• means for securing said first and said second end of said cord to terminal building blocks of an assembly of building blocks;
• said assembly of building blocks being user assembled by stringing said elastic cord through said first and said second openings of a first terminal building block, a series of other building blocks and a last terminal building block, and securing under tension said first and second ends of said cord to said first and said last terminal building blocks;
• wherein a first and a second assembly of building blocks are user interlocked by stretching said cord of said first assembly of building blocks between two selected ones of said building blocks providing an exposed section of said cord, and
• wherein said exposed cord being inserted between two selected building blocks of said second assembly of building blocks into an elongated opening of one of said two selected building blocks of said second assembly of building blocks.

An educational device for users experimenting with modifiable stringable building blocks comprising

• an stretchable elastic cord having a first and a second end;
• a plurality of polyhedron hollow building blocks of different shapes each having at least a first opening and a second opening, and
• means for securing said first and said second end of said cord to terminal building blocks of an assembly of building blocks;
• said assembly of building blocks being user assembled by stringing said elastic cord through said first and said second openings of a first terminal building block, a series of other building blocks and a last terminal building block, and securing under tension said first and second ends of said cord to said first and said last terminal building blocks;
• wherein a first section of said assembly of building blocks and a second section of said assembly of building blocks are user interlocked to form a loop of stringed building blocks, said cord of said assembly of building blocks being stretched between two first building blocks thereby exposing a section of said cord,
• said exposed cord being inserted between two selected second building blocks of said assembly of building blocks and into an elongated opening of one of said two selected second building blocks.